Patent Application
20250056607
This disclosure relates to a wireless communication system.
Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into 4 types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface.
Meanwhile, as a wider range of communication devices require larger communication capacities, the need for mobile broadband communication that is more enhanced than the existing Radio Access Technology (RAT) is rising. Accordingly, discussions are made on services and user equipment (UE) that are sensitive to reliability and latency. And, a next generation radio access technology that is based on the enhanced mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), and so on, may be referred to as a new radio access technology (RAT) or new radio (NR). Herein, the NR may also support vehicle-to-everything (V2X) communication.
According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the first device may receive, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH). For example, the first device may receive, from the second device, the second SCI through the PSSCH. For example, the second SCI includes a destination ID. For example, the first device may determine whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a first device adapted to perform wireless communication may be proposed. For example, the first device may include one or more processors; one or more transceivers; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations include at least one of
According to an embodiment of the present disclosure, a processing device adapted to control a first device may be proposed. For example, the processing device may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may comprise at least one of:
receiving, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); receiving, from the second device, the second SCI through the PSSCH, wherein the second SCI includes a destination ID; and/or determining whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, at least one non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions that, based on being executed by at least one processor, cause a first device to perform operations. For example, the operations may include at least one of:
According to an embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the second device may transmit, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH). For example, the second device may transmit, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SC.
According to an embodiment of the present disclosure, A second device adapted to perform wireless communication may be proposed. For example, the second device may comprise: one or more processors; one or more transceivers; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may include at least one of:
According to an embodiment of the present disclosure, a processing device adapted to control a second device may be proposed. For example, the processing device may comprise: one or more processors; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may include at least one of:
transmitting, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); and/or transmitting, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, at least one non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions, based on being executed by at least one processor, cause a second device to perform operations. For example, the operations may include at least one of:
In the present disclosure, “A or B” may mean “only A”, “only B” or “both A and B.” In other words, in the present disclosure, “A or B” may be interpreted as “A and/or B”. For example, in the present disclosure, “A. B. or C” may mean “only A”, “only B”, “only C”, or “any combination of A, B. C”.
A slash (/) or comma used in the present disclosure may mean “and/or”. For example, “A/B” may mean “A and/or B”. Accordingly. “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B. C” may mean “A, B, or C”.
In the present disclosure, “at least one of A and B” may mean “only A”, “only B”, or “both A and B”. In addition, in the present disclosure, the expression “at least one of A or B” or “at least one of A and/or B” may be interpreted as “at least one of A and B”.
In addition, in the present disclosure, “at least one of A, B, and C” may mean “only A”, “only B”, “only C”, or “any combination of A, B, and C”. In addition, “at least one of A, B, or C” or “at least one of A, B, and/or C” may mean “at least one of A, B, and C”.
In addition, a parenthesis used in the present disclosure may mean “for example”. Specifically, when indicated as “control information (PDCCH)”, it may mean that “PDCCH” is proposed as an example of the “control information”. In other words, the “control information” of the present disclosure is not limited to “PDCCH”, and “PDCCH” may be proposed as an example of the “control information”. In addition, when indicated as “control information (i.e., PDCCH)”, it may also mean that “PDCCH” is proposed as an example of the “control information”.
In the following description, ‘when, if, or in case of’ may be replaced with ‘based on’.
A technical feature described individually in one figure in the present disclosure may be individually implemented, or may be simultaneously implemented.
In the present disclosure, a higher layer parameter may be a parameter which is configured, pre-configured or pre-defined for a UE. For example, a base station or a network may transmit the higher layer parameter to the UE. For example, the higher layer parameter may be transmitted through radio resource control (RRC) signaling or medium access control (MAC) signaling.
The technology described below may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and so on. The CDMA may be implemented with a radio technology, such as universal terrestrial radio access (UTRA) or CDMA-2000. The TDMA may be implemented with a radio technology, such as global system for mobile communications (GSM)/general packet ratio service (GPRS)/enhanced data rate for GSM evolution (EDGE). The OFDMA may be implemented with a radio technology, such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility with a system based on the IEEE 802.16e. The UTRA is part of a universal mobile telecommunication system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTE uses the OFDMA in a downlink and uses the SC-FDMA in an uplink. LTE-advanced (LTE-A) is an evolution of the LTE.
5G NR is a successive technology of LTE-A corresponding to a new Clean-slate type mobile communication system having the characteristics of high performance, low latency, high availability, and so on. 5G NR may use resources of all spectrum available for usage including low frequency bands of less than 1 GHz, middle frequency bands ranging from 1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more, and so on.
For clarity in the description, the following description will mostly focus on LTE-A or 5G NR. However, technical features according to an embodiment of the present disclosure will not be limited only to this.
Referring to
The embodiment of
Layers of a radio interface protocol between the UE and the network can be classified into a first layer (layer 1, L1), a second layer (layer 2, L2), and a third layer (layer 3, L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system. Among them, a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network. For this, the RRC layer exchanges an RRC message between the UE and the BS.
Referring to
Between different physical layers, i.e., a physical layer of a transmitter and a physical layer of a receiver, data are transferred through the physical channel. The physical channel is modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and utilizes time and frequency as a radio resource.
The MAC layer provides services to a radio link control (RLC) layer, which is a higher layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transfer services over logical channels.
The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Unit (RLC SDU). In order to ensure diverse quality of service (QoS) required by a radio bearer (RB), the RLC layer provides three types of operation modes, i.e., a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM). An AM RLC provides error correction through an automatic repeat request (ARQ).
A radio resource control (RRC) layer is defined only in the control plane. The RRC layer serves to control the logical channel, the transport channel, and the physical channel in association with configuration, reconfiguration and release of RBs. The RB is a logical path provided by the first layer (i.e., the physical layer or the PHY layer) and the second layer (i.e., a MAC layer, an RLC layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer) for data delivery between the UE and the network.
Functions of a packet data convergence protocol (PDCP) layer in the user plane include user data delivery, header compression, and ciphering. Functions of a PDCP layer in the control plane include control-plane data delivery and ciphering/integrity protection.
A service data adaptation protocol (SDAP) layer is defined only in a user plane. The SDAP layer performs mapping between a Quality of Service (QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) marking in both DL and UL packets.
The configuration of the RB implies a process for specifying a radio protocol layer and channel properties to provide a particular service and for determining respective detailed parameters and operations. The RB can be classified into two types, i.e., a signaling RB (SRB) and a data RB (DRB). The SRB is used as a path for transmitting an RRC message in the control plane. The DRB is used as a path for transmitting user data in the user plane.
When an RRC connection is established between an RRC layer of the UE and an RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and, otherwise, the UE may be in an RRC_IDLE state. In case of the NR, an RRC_INACTIVE state is additionally defined, and a UE being in the RRC_INACTIVE state may maintain its connection with a core network whereas its connection with the BS is released.
Data is transmitted from the network to the UE through a downlink transport channel. Examples of the downlink transport channel include a broadcast channel (BCH) for transmitting system information and a downlink-shared channel (SCH) for transmitting user traffic or control messages. Traffic of downlink multicast or broadcast services or the control messages can be transmitted on the downlink-SCH or an additional downlink multicast channel (MCH). Data is transmitted from the UE to the network through an uplink transport channel. Examples of the uplink transport channel include a random access channel (RACH) for transmitting an initial control message and an uplink SCH for transmitting user traffic or control messages.
Examples of logical channels belonging to a higher channel of the transport channel and mapped onto the transport channels include a broadcast channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.
Referring to
In case of using a normal CP, each slot may include 14 symbols. In case of using an extended CP, each slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or CP-OFDM symbol) and a Single Carrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbol).
Table 1 shown below represents an example of a number of symbols per slot (Nslotsymb), a number slots per frame (Nframe,uslot), and a number of slots per subframe (Nsubframe,uslot) based on an SCS configuration (u), in a case where a normal CP is used.
Table 2 shows an example of a number of symbols per slot, a number of slots per frame, and a number of slots per subframe based on the SCS, in a case where an extended CP is used.
In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on) between multiple cells being integrate to one UE may be differently configured. Accordingly, a (absolute time) duration (or section) of a time resource (e.g., subframe, slot or TTI) (collectively referred to as a time unit (TU) for simplicity) being configured of the same number of symbols may be differently configured in the integrated cells.
In the NR, multiple numerologies or SCSs for supporting diverse 5G services may be supported. For example, in case an SCS is 15 kHz, a wide area of the conventional cellular bands may be supported, and, in case an SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrier bandwidth may be supported. In case the SCS is 60 kHz or higher, a bandwidth that is greater than 24.25 GHz may be used in order to overcome phase noise.
An NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values of the frequency ranges may be changed (or varied), and, for example, the two different types of frequency ranges may be as shown below in Table 3. Among the frequency ranges that are used in an NR system. FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6 GHz range” and may also be referred to as a millimeter wave (mmW).
As described above, the values of the frequency ranges in the NR system may be changed (or varied). For example, as shown below in Table 4, FR1 may include a band within a range of 410 MHz to 7125 MHz. More specifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1 mat include an unlicensed band. The unlicensed band may be used for diverse purposes, e.g., the unlicensed band for vehicle-specific communication (e.g., automated driving).
Referring to
A carrier includes a plurality of subcarriers in a frequency domain. A Resource Block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A Bandwidth Part (BWP) may be defined as a plurality of consecutive (Physical) Resource Blocks ((P)RBs) in the frequency domain, and the BWP may correspond to one numerology (e.g., SCS, CP length, and so on). A carrier may include a maximum of N number BWPs (e.g., 5 BWPs). Data communication may be performed via an activated BWP. Each element may be referred to as a Resource Element (RE) within a resource grid and one complex symbol may be mapped to each element.
Hereinafter, a bandwidth part (BWP) and a carrier will be described.
The BWP may be a set of consecutive physical resource blocks (PRBs) in a given numerology. The PRB may be selected from consecutive sub-sets of common resource blocks (CRBs) for the given numerology on a given carrier
For example, the BWP may be at least any one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in a DL BWP other than an active DL BWP on a primary cell (PCell). For example, the UE may not receive PDCCH, physical downlink shared channel (PDSCH), or channel state information-reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for the inactive DL BWP. For example, the UE may not transmit physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) outside an active UL BWP. For example, in a downlink case, the initial BWP may be given as a consecutive RB set for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by physical broadcast channel (PBCH)). For example, in an uplink case, the initial BWP may be given by system information block (SIB) for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, an initial value of the default BWP may be an initial DL BWP. For energy saving, if the UE fails to detect downlink control information (DCI) during a specific period, the UE may switch the active BWP of the UE to the default BWP.
Meanwhile, the BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, a transmitting UE may transmit a SL channel or a SL signal on a specific BWP, and a receiving UE may receive the SL channel or the SL signal on the specific BWP. In a licensed carrier, the SL BWP may be defined separately from a Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS/network. For example, the UE may receive a configuration for the Uu BWP from the BS/network. The SL BWP may be (pre-)configured in a carrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UE in the RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.
Referring to
The BWP may be configured by a point A, an offset NstartBWP from the point A, and a bandwidth NsizeBWP. For example, the point A may be an external reference point of a PRB of a carrier in which a subcarrier 0 of all numerologies (e.g., all numerologies supported by a network on that carrier) is aligned. For example, the offset may be a PRB interval between a lowest subcarrier and the point A in a given numerology. For example, the bandwidth may be the number of PRBs in the given numerology.
Hereinafter, V2X or SL communication will be described.
A sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as a SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.
A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be 56 bits including 24-bit cyclic redundancy check (CRC).
The S-PSS, the S-SSS, and the PSBCH may be included in a block format (e.g., SL synchronization signal (SS)/PSBCH block, hereinafter, sidelink-synchronization signal block (S-SSB)) supporting periodical transmission. The S-SSB may have the same numerology (i.e., SCS and CP length) as a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH) in a carrier, and a transmission bandwidth may exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, a frequency position of the S-SSB may be (pre-)configured. Accordingly, the UE does not have to perform hypothesis detection at frequency to discover the S-SSB in the carrier.
For example, (a) of
For example, (b) of
Referring to (a) of
For example, the first UE may receive information related to dynamic grant (DG) resource(s) and/or information related to configured grant (CG) resource(s) from the base station. For example, the CG resource(s) may include CG type 1 resource(s) or CG type 2 resource(s). In the present disclosure, the DG resource(s) may be resource(s) configured/allocated by the base station to the first UE through a downlink control information (DCI). In the present disclosure, the CG resource(s) may be (periodic) resource(s) configured/allocated by the base station to the first UE through a DCI and/or an RRC message. For example, in the case of the CG type 1 resource(s), the base station may transmit an RRC message including information related to CG resource(s) to the first UE. For example, in the case of the CG type 2 resource(s), the base station may transmit an RRC message including information related to CG resource(s) to the first UE, and the base station may transmit a DCI related to activation or release of the CG resource(s) to the first UE.
In step S610, the first UE may transmit a PSCCH (e.g., sidelink control information (SCI) or 1st-stage SCI) to a second UE based on the resource scheduling. In step S620, the first UE may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S630, the first UE may receive a PSFCH related to the PSCCH/PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE through the PSFCH. In step S640, the first UE may transmit/report HARQ feedback information to the base station through the PUCCH or the PUSCH For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on a pre-configured rule. For example, the DCI may be a DCI for SL scheduling. For example, a format of the DCI may be a DCI format 3_0 or a DCI format 3_1.
Hereinafter, an example of DCI format 3_0 will be described.
DCI format 3_0 is used for scheduling of NR PSCCH and NR PSSCH in one cell.
The following information is transmitted by means of the DCI format 3_0 with CRC scrambled by SL-RNTI or SL-CS-RNTI:
Referring to (b) of
Referring to (a) or (b) of
Hereinafter, an example of SCI format 1-A will be described.
SCI format 1-A is used for the scheduling of PSSCH and 2nd-stage-SCI on PSSCH.
The following information is transmitted by means of the SCI format 1-A:
Hereinafter, an example of SCI format 2-A will be described.
SCI format 2-A is used for the decoding of PSSCH, with HARQ operation when HARQ-ACK information includes ACK or NACK, when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.
The following information is transmitted by means of the SCI format 2-A:
Hereinafter, an example of Sc format 2-B will be described.
SCI format 2-B is used for the decoding of PSSCH, with HARQ operation when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.
The following information is transmitted by means of the SCI format 2-B:
Referring to (a) or (b) of
Referring to (a) of
Hereinafter, a hybrid automatic repeat request (HARQ) procedure will be described.
For example, the SL HARQ feedback may be enabled for unicast. In this case, in a non-code block group (non-CBG) operation, if the receiving UE decodes a PSCCH of which a target is the receiving UE and if the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate HARQ-ACK. In addition, the receiving UE may transmit the HARQ-ACK to the transmitting UE. Otherwise, if the receiving UE cannot successfully decode the transport block after decoding the PSCCH of which the target is the receiving UE, the receiving UE may generate the HARQ-NACK. In addition, the receiving UE may transmit HARQ-NACK to the transmitting UE.
For example, the SL HARQ feedback may be enabled for groupcast. For example, in the non-CBG operation, two HARQ feedback options may be supported for groupcast.
For example, if the groupcast option 1 is used in the SL HARQ feedback, all UEs performing groupcast communication may share a PSFCH resource. For example, UEs belonging to the same group may transmit HARQ feedback by using the same PSFCH resource.
For example, if the groupcast option 2 is used in the SL HARQ feedback, each UE performing groupcast communication may use a different PSFCH resource for HARQ feedback transmission. For example, UEs belonging to the same group may transmit HARQ feedback by using different PSFCH resources.
In the present disclosure, HARQ-ACK may be referred to as ACK. ACK information, or positive-ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative-ACK information.
Hereinafter, UE procedure for determining the subset of resources to be reported to higher layers in PSSCH resource selection in sidelink resource allocation mode 2 will be described.
In resource allocation mode 2, the higher layer can request the UE to determine a subset of resources from which the higher layer will select resources for PSSCH/PSCCH transmission. To trigger this procedure, in slot n, the higher layer provides the following parameters for this PSSCH/PSCCH transmission:
The following higher layer parameters affect this procedure:
The resource reservation interval, Prsvp_TX, if provided, is converted from units of msec to units of logical slots, resulting in P′rsvp_TX.
(t′SL0, t′SL1, t′SL2, . . . ) denotes the set of slots which belongs to the sidelink resource pool.
For example, the UE may select a set of candidate resources (SA) based on Table 8. For example, if resource (re)selection is triggered, the UE may select a set of candidate resources (SA) based on Table 11. For example, if re-evaluation or pre-emption is triggered, the UE may select a set of candidate resources (SA) based on Table 8.
Meanwhile, partial sensing may be supported for power saving of the UE. For example, in LTE SL or LTE V2X, the UE may perform partial sensing based on Tables 9 and 10.
Meanwhile, the conventional candidate resource selection method has a problem of performance (or capability) degradation, which is caused by applying only random selection for a first packet of periodic transmission.
Meanwhile, when a UE performs partial sensing, the UE needs to determine a range of partial sensing (e.g., range/number of slots being the target (or object) of partial sensing). For example, when the partial sensing range is not defined, the UE may perform monitoring during a relatively long time period (or time duration), and this may cause unnecessary power consumption of the UE. For example, when the partial sensing range is not defined, the UE may perform monitoring during a relatively short time period (or time duration). In this case, the UE may not determine resource conflict (or resource collision) with another UE, and, due to such resource conflict, reliability in SL transmission may not be ensured. In the present disclosure, partial sensing may include periodic-based partial sensing (PPS) or continuous partial sensing (CPS). In the present disclosure, PPS may also be referred to as PBPS.
According to various embodiments of the present disclosure, proposed herein are a method for selectively applying random selection and CPS based resource selection for the first packet of a periodic transmission and an apparatus supporting the same. According to various embodiments of the present disclosure, proposed herein are an SL transmission resource selection method and an apparatus supporting the same that can minimize power consumption of the UE, when the UE is operating based on partial sensing.
For example, in various embodiments of the present disclosure, when performing sensing for resource selection, based on a number of cycle periods corresponding to a specific configuration value, periodic-based partial sensing (PPS) may mean an operation performing sensing at time points corresponding to an integer multiple (k) of each cycle period. For example, the cycle periods may be cycle periods of transmission resource configured in a resource pool. For example, PPS may sense resource of a time point temporally preceding a time point of a candidate resource, which is to be a target that determines resource conflict, as much as the integer multiple k value of each cycle period. For example, the k value may be configured to have a bitmap format.
In the embodiments of
Referring
Referring
For example, in various embodiments of the present disclosure, continuous partial sensing (CPS) may mean an operation performing sensing for all or part of a time domain that is given as a specific configuration value. For example, CPS may include a short-term sensing operation that performs sensing during a relatively short time period (or time duration).
In the embodiment of
Referring to
In an embodiment of the present disclosure, REV may mean resource re-evaluation, and PEC may mean resource pre-emption checking.
In an embodiment of the present disclosure, when a transmission resource selection is initially triggered for transmitting a random packet, a resource selection window for performing sensing (e.g., full, partial sensing) may be selected, and a “candidate resource/slot” may mean resource that is selected for detecting the occurrence or non-occurrence of resource conflict within the resource selection window, a “valid resource/slot” is a resource that has been determined to be valid (or effective) for transmission, since resource conflict has not been detected among the candidate resources based on the sensing, and, then, reported from a PHY layer to a MAC layer, and a “transmission resource/slot” may mean a resource that has been finally selected, by the MAC layer, among the reported resources, in order to be used for an SL transmission.
Hereinafter, the SL synchronization signal (Sidelink Synchronization Signal, SLSS) and synchronization information will be described.
A sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as a SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.
A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be 56 bits including 24-bit cyclic redundancy check (CRC).
The S-PSS, the S-SSS, and the PSBCH may be included in a block format (e.g., SL synchronization signal (SS)/PSBCH block, hereinafter, sidelink-synchronization signal block (S-SSB)) supporting periodical transmission. The S-SSB may have the same numerology (i.e., SCS and CP length) as a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH) in a carrier, and a transmission bandwidth may exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, a frequency position of the S-SSB may be (pre-)configured. Accordingly, the UE does not have to perform hypothesis detection at frequency to discover the S-SSB in the carrier.
Hereinafter, synchronization acquisition of a SL UE will be described.
In time division multiple access (TDMA) and frequency division multiple access (FDMA) systems, accurate time and frequency synchronization is essential. If the time and frequency synchronization is not accurate, system performance may be degraded due to inter symbol interference (ISI) and inter carrier interference (ICI). The same is true for V2X. In V2X, for time/frequency synchronization, sidelink synchronization signal (SLSS) may be used in a physical layer, and master information block-sidelink-V2X (MIB-SL-V2X) may be used in a radio link control (RLC) layer.
Referring to
Alternatively, the UE may be directly synchronized with a BS, or may be synchronized with another UE which is time/frequency-synchronized with the BS. For example, the BS may be an eNB or a gNB. For example, if the UE is inside the network coverage, the UE may receive synchronization information provided by the BS, and may be directly synchronized with the BS. Thereafter, the UE may provide the synchronization information to adjacent another UE. If BS timing is configured based on synchronization, for synchronization and downlink measurement, the UE may be dependent on a cell related to a corresponding frequency (when it is inside the cell coverage at the frequency), or a primary cell or a serving cell (when it is outside the cell coverage at the frequency).
The BS (e.g., serving cell) may provide a synchronization configuration for a carrier used in V2X or SL communication. In this case, the UE may conform to the synchronization configuration received from the BS. If the UE fails to detect any cell in a carrier used in the V2X or SL communication and fails to receive the synchronization configuration from the serving cell the UE may conform to a pre-configured synchronization configuration.
Alternatively, the UE may be synchronized with another UE which fails to obtain synchronization information directly or indirectly from the BS or the GNSS. A synchronization source or preference may be pre-configured to the UE. Alternatively, the synchronization source and preference may be configured through a control message provided by the BS.
An SL synchronization source may be associated/related with a synchronization priority. For example, a relation between the synchronization source and the synchronization priority may be defined as shown in Table 11 or Table 12. Table 11 or Table 12 are for exemplary purposes only, and the relation between the synchronization source and the synchronization priority may be defined in various forms.
In Table 11 or Table 12, P0 may denote a highest priority, and P6 may denote a lowest priority. In Table 11 or Table 12, the BS may include at least one of a gNB and an eNB. Whether to use GNSS-based synchronization or BS-based synchronization may be (pre-)configured. In a single-carrier operation, the UE may derive transmission timing of the UE from an available synchronization reference having the highest priority.
For example, the UE may (re)select a synchronization reference, and the UE may obtain synchronization from the synchronization reference. In addition, the UE may perform SL communication (e.g., PSCCH/PSSCH transmission/reception, physical sidelink feedback channel (PSFCH) transmission/reception, S-SSB transmission/reception, reference signal transmission/reception, etc.) based on the obtained synchronization.
Unless otherwise noted, the definitions below are applicable to the following terminologies used in the present disclosure.
According to an embodiment of the present disclosure, for example, an eNB operating licensed assisted access (LAA) Scell(s) in channel(s) and a gNB performing transmission(s) in channel(s) transmit(s)) may perform a channel access procedure to access channel(s).
According to an embodiment of the present disclosure, for example, XThresh for sensing may be adjusted, if applicable.
According to an embodiment of the present disclosure, for example, the gNB may perform a channel access procedure unless the provided higher layer parameter ChannelAccessMode-r16 is ‘semi-static’.
Hereinafter, a method of transmitting a downlink signal through an unlicensed band will be described. For example, a method of transmitting a downlink signal through an unlicensed band may be applied to a method of transmitting a sidelink signal through an unlicensed band.
The base station may perform one of the following channel access procedures (e.g., CAP) for downlink signal transmission in an unlicensed band.
In the type 1 DL CAP, the length of a time duration spanned by sensing slots sensed to be idle before transmission(s) may be random. The type 1 DL CAP may be applied to the following transmissions:
Referring to
If an eNB/gNB has not transmitted a transmission after step 4 in the procedure above, the eNB/gNB may transmit a transmission on the channel, if the channel is sensed to be idle at least in a sensing slot duration Tsl when the eNB/gNB is ready to transmit and if the channel has been sensed to be idle during all the sensing slot durations of a defer duration Td immediately before this transmission. If the channel has not been sensed to be idle in a sensing slot duration Tsl when the eNB/gNB first senses the channel after it is ready to transmit or if the channel has been sensed to be not idle during any of the sensing slot durations of a defer duration Td immediately before this intended transmission, the eNB/gNB proceeds to step 1 after sensing the channel to be idle during the sensing slot durations of a defer duration Td.
Table 13 shows that mp, a minimum contention window (CW), a maximum CW, a maximum channel occupancy time (MCOT), and an allowed CW size, which are applied to the CAP, vary depending on channel access priority classes.
Referring to Table 13, a contention window size (CWS), a maximum COT value, etc. for each CAPC may be defined. For example, Td may be equal to Tf+mp*Tsl(Td=Tf+mp*Tsl).
The defer duration Td is configured in the following order: duration Tf (16 us)+mp consecutive sensing slot durations Tsl (9 us). Tf includes the sensing slot duration Tsl at the beginning of the 16 us duration.
The following relationship is satisfied: CWmin,p<=CWp<=CWmax,p. CWp may be configured by CWp=CWmin,p and updated before step 1 based on HARQ-ACK feedback (e.g., the ratio of ACK or NACK) for a previous DL burst (e.g., PDSCH) (CW size update). For example, CWp may be initialized to CWmin,p based on the HARQ-ACK feedback for the previous DL burst. Alternatively, CWp may be increased to the next higher allowed value or maintained as it is.
For example, the eNB/gNB may not transmit on the channel for a channel occupancy time exceeding Tmcot,p, where the channel access procedure is performed according to the channel access priority class p associated with the eNB/gNB transmission (e.g., Table 13) can be performed.
For example, if the eNB/gNB transmits the discovery burst (s) when N>0 in the above procedure, the eNB/gNB may not decrease N during the sensing slot period (s) overlapping with the discovery burst (s) there is.
For example, a gNB may use any channel access priority class to perform the above procedure to send transmission(s) containing discovery burst(s).
For example, a gNB may use a channel access priority class applicable to unicast user plane data multiplexed to PDSCH to perform the above procedure for sending a transmission containing a unicast PDSCH together with user plane data, can
For example, for p=3/p=4, Tmcot,p=10 ms if the absence of other technologies sharing the channel can be guaranteed in the long-term (e.g., depending on the level of regulation), otherwise Tmcot,p=8 ms.
In the type 2 DL CAP, the length of a time duration spanned by sensing slots sensed to be idle before transmission(s) may be determined. The type 2 DL CAP is classified into type 2A/2B/2C DL CAPs.
The type 2A DL CAP may be applied to the following transmissions.
In the type 2A DL CAP, the base station may perform transmission immediately after the channel is sensed to be idle at least for a sensing duration Tshort_dl=25 us. Herein, Tshort_dl includes the duration Tf (=16 us) and one sensing slot duration immediately after the duration Tf, where the duration Tf includes a sensing slot at the beginning thereof.
For example, according to Type 2A DL channel access procedures, an eNB/gNB may transmit a DL transmission immediately after sensing the channel to be idle for at least a sensing interval Tshort_dl=25 μs. Here, for example, Tshort_dl may consist of a duration Tf=16 μs immediately followed by one sensing slot. For example, Tf may include a sensing slot at start of Tf.
For example, Type 2B DL channel access procedures, is applicable to the transmission(s) performed by a gNB following transmission(s) by a UE after a gap of 16 μs or up to 16 μs, respectively, in a shared channel occupancy. For example, according to Type 2B DL channel access procedures, A gNB may transmit a DL transmission immediately after sensing the channel to be idle within a duration of T_f=16 μs. For example, T_f may include a sensing slot that occurs within the last 9 μs of T_f. For example, the channel may be considered to be idle within the duration T_f if the channel is sensed to be idle for a total of at least 5 μs with at least 4 μs of sensing occurring in the sensing slot.
For example, Type 2C DL channel access procedures, is applicable to the transmission(s) performed by a gNB following transmission(s) by a UE after a gap of 16 μs or up to 16 μs, respectively, in a shared channel occupancy. For example, according to Type 2C DL channel access procedures, the gNB may not sense the channel before transmission of the DL transmission. The duration of the corresponding DL transmission may be at most 584 μs.
Referring now to
Table 14 illustrates the Channel Access Procedure (CAP) supported in NR-U.
Referring to Table 14, an LBT type or CAP for DL/UL/SL transmission may be defined. However, Table 14 is only an example, and anew type or CAP may be defined in a similar manner. For example. Type 1 (also referred to as Cat-A LBT) may be a random back-off based channel access procedure. For example, in the case of Cat-4, the contention window may change. For example, type 2 can be performed in case of COT sharing within COT acquired by gNB or UE.
For example, when the COT obtained by the UE is shared with another UE (eg, when the other UE obtains information on the COT shared from the UE), the other UE transmits within the COT after a Type 2 CAP Transmission (e.g., transmission to the UE or other device) may be performed using resources. However, for example, the other UE cannot distinguish whether the COT (e.g., transmission resource within the COT) is for itself or not with only the information about the shared COT. Thus, for example, transmission resources within the shared COT may be used indiscriminately or may not be used by anyone.
According to one embodiment of the present disclosure, for example, the SL mode-2 resource allocation may include a resource allocation in which the UE selects a transmission resource based on sensing for ITS dedicated bands or licensed bands, whereas in unlicensed bands, the transmission resource selection may not be guaranteed.
According to one embodiment of the present disclosure, a method for efficiently selecting transmission resources by a UE in an unlicensed band and an apparatus for supporting the same may be proposed.
According to one embodiment of the present disclosure, for example, in an unlicensed band, a base station or UE may basically generate a channel occupancy time (COT) based on a listen before talk (LBT) behavior and perform communications based on the resources within the obtained COT.
According to one embodiment of the present disclosure, for example, when a UE performs SL mode-2 operation, the base station may perform LBT operation to acquire(obtain) a COT above a threshold time interval, and the base station may direct/share the acquired COT to the UE as part of a SL resource pool from which the SL UE may perform resource selection. For example, the SL resource pool may be set(configured) (in advance) in the form of a bitmap or the like for the base station-acquired COT durations. According to one embodiment, a UE performing SL communication in an unlicensed band may perform SL communication based on the transmission channel access competition between base stations or UEs, and/or based on COTs generated(initiated) via LBT or shared by base stations or UEs without setting(configuring) a specific SL resource pool.
According to one embodiment of the present disclosure, for example, a UE performing SL communications in an unlicensed band may, based on one or more COTs generated through the LBT, perform HARQ feedback transmissions for a TB transmission performed over a temporally preceding (e.g., prior, followed in time) COT and a HARQ feedback transmission for the reception of the TB over a temporally lagging (e.g., subsequent, following in time) COT.
According to one embodiment of the present disclosure, for example, a UE performing SL communications in an unlicensed band may select resources within a COT generated(initiated) via LBT that are adjacent to each other, or that is included within a time interval below a certain threshold, or that are separated by a time/frequency distance below a certain threshold, to transmit TBs. For example, the UE may perform only blind transmissions for TB transmissions within a COT, and transmit HARQ feedback for the blind transmissions within the COT via a temporally lagging COT or the temporally earliest COT after the COT.
According to one embodiment of the present disclosure, for example, a HARQ feedback-based transmission may be performed within the COT for TB transmissions within a COT and for TB transmissions for which HARQ feedback for the TB transmissions can be received, and a blind transmission may be performed for TB transmissions for which HARQ feedback is not received outside the COT.
According to one embodiment of the present disclosure, for example, when a TX UE transmits a TB to an RX UE, the RX UE may transmit HARQ feedback to the TX UE within a COT generated by the TX UE via LBT. For example, even if the TX UE does not share the COT with the RX UE (e.g., even if the TX UE does not transmit signaling(channel) associated with COT sharing to the RX UE), it may be expected that the TX UE has sufficient COT bandwidth to allow the RX UE to transmit the HARQ feedback within the COT generated by the TX UE (e.g., after a HARQ RTT(round-trip time) gap).
According to one embodiment of the present disclosure, for example, when SL communication is performed in an unlicensed band, the UE may repeatedly (e.g., blindly) transmit the same TB through one slot or one symbol within the COT generated via LBT. For example, instead of the above repeated transmission, the UE may transmit a codeword generated at a lower code rate (e.g., a mother code generated for HARQ transmission) for the TB transmission through one slot or one symbol in the COT generated through the LBT to obtain coding gain.
According to one embodiment of the present disclosure, for example, when a UE generates a COT based on LBT for SL communication in an unlicensed band, the UE may only share the COT with at least one of a peer UE performing a SL unicast, a group member UE performing a SL groupcast, or neighboring UEs present within a certain threshold distance (e.g., communication range requirement)/zone (e.g., zone ID) from the UE.
According to one embodiment of the present disclosure, for example, when a UE generates(initiates) a COT based on an LBT for SL communications in an unlicensed band, the UE may share the COT only with UEs that are using the same synchronization reference as that selected by the UE, or that have selected a synchronization reference with the same synchronization priority based on the synchronization reference selected by the UE, or that have a sync timing offset within a certain threshold from the sync timing used by the UE.
According to one embodiment of the present disclosure, for example, if a UE has generated(initiated) a COT based on an LBT for SL communication in an unlicensed band, the UE may share the COT information with other UEs via an inter-UE coordination message.
According to one embodiment of the present disclosure, for example, where a UE has generated(initiated) a COT based on an LBT for SL communications in an unlicensed band and the UE has shared the COT with another UE, the UE or the other UE may select (whether to use) transmission resources within the COT based on a rule base associated with a predefined or (pre)established resource allocation. For example, (whether to use) the transmission resource within the COT may be determined based on a source or destination ID associated with a TB transmitted by the UE. For example, (whether to use) the transmission resource within the COT may be determined based on an ID associated with the UE, or a group member ID of a group to which the UE belongs, or the like.
According to one embodiment of the present disclosure, for example, where a UE has generated(initiated) a COT based on an LBT for SL communications in an unlicensed band, the UE may, for a duration within a certain threshold from the start of the COT, determine a transmission resource based on a rule associated with a predefined or (pre)established resource allocation (e.g., based on a source or destination ID associated with a TB transmitted by the UE, based on an ID associated with the UE, based on a group member ID of a group to which the UE belongs, etc.), and for a duration after a certain threshold from the start of the COT, the UE may select a transmission resource based on a sensing of the duration before the certain threshold.
According to various embodiments of the present disclosure, when SL communications are performed in an unlicensed band, a method for a UE to transmit a TB based on HARQ feedback and receive HARQ feedback for a COT generated(initiated) based on LBT, and a method for efficiently selecting resources by one or more UEs within the shared COT may be presented.
Referring to
For example, the first communication node(s) may perform a channel access on the first channel. For example, the channel access procedure may be performed based on sensing.
For example, the first communication node may obtain (e.g., initiate) a channel occupancy time (COT)/channel occupancy (CO) (hereinafter collectively referred to as COT) (e.g., based on the channel access performed). For example, the COT may be shared.
For example, the first communication node may transmit (e.g., configure) information related to the COT (e.g., information related to the sharing of the COT, information related to the COT shared from the communication node, information to indicate the shared COT, etc.) to the second communication node.
For example, the second communication node(s) may determine, based on an identity (e.g., entity ID (e.g., station ID, vehicle ID, pedestrian ID, RSU ID), application layer ID, source ID, destination ID), whether to use the shared COT from the first communication node. For example, the second communication node(s) may determine whether to use the shared COT from the first communication node based on a destination ID included in the second SCI matching a destination ID associated with the first communication node. For example, the second communication node(s) may determine whether to use the shared COT from the first communication node based on a destination ID/source ID included in the second SCI matching a source ID/destination ID associated with the first communication node.
For example, the second communication node(s) may perform a transmission (e.g., a transmission to the first communication node, a transmission to a third device, a transmission to another second communication node(s)) based on the shared COT.
For example, A responding UE over a shared COT may include at least one of the followings.
Embodiment(s) of the present disclosure may have a variety of effects. For example, according to one embodiment of the present disclosure, a receiving UE may be able to distinguish whether a COT (e.g., transmission resources within a COT) shared from a COT-initiator is intended for the receiving UE itself or not. For example, according to one embodiment of the present disclosure, transmission resources within the shared COT may not be wasted. For example, according to one embodiment of the present disclosure, transmission resources within the shared COT may be utilized for the purposes of the COT-initiator.
According to one embodiment of the present disclosure, for example, in unlicensed bands, a base station or UE may basically generate(initiate) a COT based on listen before talk (LBT) behavior, and may perform communications based on resources within the obtained COT. For example, in Uu-based unlicensed communications, a base station may generate a COT, the base station may share the generated COT with a UE, and the UE may perform communications over scheduled resources in the shared COT, or a UE may generate a COT and the UE may share the generated COT with the base station, and the base station may transmit data to the UE over resources in the COT. One embodiment(s) of the present disclosure may suggest how a UE selects a transmission resource when performing SL communications in an unlicensed band.
According to one embodiment of the present disclosure, for example, in SL mode-1 operation, a base station may generate periodic fixed frame periods (FFPs) and may schedule resources within the FFPs to SL UEs. The base station may generate the FFPs only when there is no other transmission, with a threshold time gap between consecutive FFPs, and by performing LBT for a threshold time.
According to one embodiment of the present disclosure, for example, the base station may allocate a Configured Grant (CG) resource to the UE within the FFP. For example, the base station may allocate a CG type-1 resource to the UE via an RRC, wherein the RRC may include an offset value and a period value for the CG type-1 resource, wherein, for example, the offset value may be a reference point associated with a start time of the FFP. For example, the reference point may be the FFP closest to the DL SFN=0 time point, or the FFP at which the RRC is sent, or each periodically generated FFP.
For example, if the CG type-1 resource is allocated over one or more FFPs, after the UE receives an RRC indicating the CG type-1, the UE may transmit using a periodic CG type-1 resource based on the offset value and the period value, if the base station failed to generate the FFP because another transmission was detected after performing the LBT prior to the generation of the particular FFP, the base station may, after performing the LBT to generate the FFP, signal to the UE via RRC or DCI (e.g., using the COT obtained through the new LBT) that the FFP generation has failed, or may deactivate the CG type-1 resource belonging to the FFP that failed to be generated, thereby preventing the UE from transmitting over the invalid CG type-1 resource.
According to one embodiment of the present disclosure, for example, the base station may allocate a Configured Grant (CG) resource to a UE within the FFP. For example, the base station may allocate a CG type-2 resource to the UE via an RRC and a DCI, wherein the RRC may include an offset value and a period value for the CG type-2 resource, and the DCI may include a time/frequency location for the CG type-2 resource. In one example, the offset value may be a reference point associated with a start time of the FFP at which the DCI is transmitted.
According to one embodiment of the present disclosure, for example, if the CG type-2 resource is allocated over one or more FFPs, after the UE receives the DCI activating the CG type-2 resource, the UE may transmit using the CG type-2 resource periodically based on the offset value and the period value, if the base station has failed to generate an FFP due to detection of another transmission after performing LBT prior to generating a particular FFP, the base station may, after performing the LBT to generate the FFP, signal to the UE via DCI (e.g., using the COT obtained through the new LBT) that the FFP generation has failed, or may deactivate the CG type-2 resource belonging to the FFP that failed to be generated, thereby preventing the UE from transmitting over the invalid CG type-2 resource.
According to one embodiment of the present disclosure, for example, if the base station fails to generate an FFP for the CG type-1 or CG type-2 resource, the UE may convert(switch) to an SL mode-2 transmission, rather than an FFP-based transmission for the mode-1 transmission, and perform the LBT (e.g., LBT type1, type2A or type 2B or type 2C) required for the SL mode-2 transmission, and perform a TB transmission based on it.
According to one embodiment of the present disclosure, for example, in SL mode-1 operation, the base station may create a COT based on the LBT and schedule resources within the COT to the SL UE. For example, in order to allocate CG resources to the UE for periodic transmissions, the base station may generate a COT based on the LBT to include the timing of the periodic transmissions.
According to one embodiment of the present disclosure, for example, the base station may allocate a Configured Grant (CG) resource to a UE within the COT. The base station may allocate a CG type-1 resource to the UE via an RRC, wherein the RRC may include an offset value and a period value for the CG type-1 resource, wherein the offset value may be a reference point associated with a start time of the COT. For example, the reference point may be the COT closest to the DL SFN=0 point, or the COT at which the RRC is transmitted, or each COT generated based on the LBT.
According to one embodiment of the present disclosure, for example, if the CG type-1 resource is allocated across(over) one or more COTs, the UE, after receiving an RRC indicating the CG type-1, transmits using the CG type-1 resource at periodic intervals based on the offset value and the period value, if the base station fails to generate a COT covering(including) the timing(duration) of the periodic transmission because another transmission is detected after performing the LBT, the base station may, after performing the LBT to generate the COT, signal to the UE via RRC or DCI (using the COT obtained through the new LBT) that the COT generation has failed, and/or deactivate the CG type-1 resource belonging to(included in) the failed COT to prevent the UE from transmitting over the invalid CG type-1 resource.
According to one embodiment of the present disclosure, for example, the base station may allocate a Configured Grant (CG) resource to a UE within the COT. In this case, the base station may allocate a CG type-2 resource to the UE via an RRC and a DCI, wherein the RRC may include an offset value and a period value for the CG type-2 resource, and the DCI may include a time/frequency location(position) for the CG type-2 resource. In one example, the offset value may be a reference time associated with a start time of the COT in which the DCI is transmitted.
According to one embodiment of the present disclosure, for example, when the CG type-2 resource is allocated over one or more COTs, the UE, after receiving the DCI activating the CG type-2 resource, transmits using the CG type-2 resource at periodic intervals based on the offset value and the period value, and then if the base station has failed to generate a COT covering(including) the time of the periodic transmission due to the detection of another transmission after performing the LBT, the base station may, after performing the LBT to generate the COT, signal the UE via DCI (using the COT obtained through the new LBT) that the COT generation has failed, and/or deactivate the CG type-2 resource belonging to(included in) the failed COT to prevent the UE from transmitting over the invalid CG type-2 resource.
According to one embodiment of the present disclosure, for example, if the base station fails to generate a COT for the CG type-1 or CG type-2 resource, the UE may convert to an SL mode-2 transmission, rather than a COT-based transmission for the mode-1 transmission, and perform the LBT (e.g., LBT type1, type2A or type 2B or type 2C) required for the SL mode-2 transmission, and perform a TB transmission based on it.
According to one embodiment of the present disclosure, for example, if the base station allocates a CG resource to the UE based on an FFP, or if the base station allocates a CG resource to the UE based on a COT, the UE may be notified(receive notification) by the base station that the generation of the FFP or COT has failed, or if the UE has not received an RRC or DCI deactivating the corresponding CG resource within a threshold range as of a certain time, the UE may no longer wait for reception of the RRC or DCI, and the UE may convert to SL mode-2 transmission and perform the LBT (e.g., LBT type1, type2A or type 2B or type 2C) required for SL mode-2 transmission, and may perform TB transmission based thereon. For example, the certain time may be associated with an expected start of a FFP or COT, or may be associated with a periodic transmission resource time.
According to one embodiment of the present disclosure, if, for example, the UE has requested a DG resource allocation from the base station via a buffer state report (BSR) or HARQ feedback, and the base station has failed to allocate the DG resource to the UE based on LBT for a threshold time, the UE may switch to SL mode-2 transmission and perform the LBT (e.g., LBT type1, type2A or type 2B or type 2C) required for SL mode-2 transmission, and may perform a TB transmission based thereon.
According to various embodiments of the present disclosure, in order for a base station in an unlicensed band to allocate SL mode-1 resources to a UE, the base station may allocate resources based on FFP or COT, or if resource allocation from the base station fails, the UE may switch to SL mode-2 to obtain transmission resources based on LBT.
For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a service type. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) (LCH or service) priority. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) QoS requirements (e.g., latency, reliability, minimum communication range). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) PQI parameters. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) HARQ feedback ENABLED LCH/MAC PDU (transmission). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) HARQ feedback DISABLED LCH/MAC PDU (transmission). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a CBR measurement value of a resource pool. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) an SL cast type (e.g., unicast, groupcast, broadcast). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) an SL groupcast HARQ feedback option (e.g., NACK only feedback, ACK/NACK feedback, TX-RX range-based NACK only feedback). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) SL mode 1 CG type (e.g., SL CG type 1 or SL CG type 2). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) SL mode type (e.g., mode 1 or mode 2). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a resource pool. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) whether or not the resource pool is configured of PSFCH resource. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a source (L2) ID. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a destination (L2) ID. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a PC5 RRC connection link. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) an SL link. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a connection status (with a base station) (e.g., RRC CONNECTED state. IDLE state, INACTIVE state). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) an SL HARQ process (ID). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a performance or non-performance of an SL DRX operation (of the TX UE or RX UE). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) whether or not the (TX or RX) UE is a power saving UE. For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a case where PSFCH TX and PSFCH RX (and/or a plurality of PSFCH TXs (exceeding the UE capability)) overlap (in the viewpoint of a specific UE). For example, a parameter value that is related to the application or non-application of the aforementioned rule and/or that is related to the proposed method/rule of the present disclosure may be configured/allowed specifically to (or differently or independently from) a case where an RX UE has actually received PSCCH (and/or PSSCH) (re-)transmission (successfully) from a TX UE.
For example, in the present disclosure, the wording for configuration (or designation) may be extendedly interpreted as a form of informing (or notifying), by a base station, to a UE through a pre-defined (physical layer or higher layer) channel/signal (e.g., SIB, RRC, MAC CE) (and/or a form being provided through a pre-configuration and/or a form of informing (or notifying), by the UE, to another UE through a pre-defined (physical layer or higher layer) channel/signal (e.g., SL MAC CE, PC5 RRC)).
For example, in the present disclosure, the wording for PSFCH may be extendedly interpreted as (NR or LTE) PSSCH (and/or (NR or LTE) PSCCH) (and/or (NR or LTE) SL SSB (and/or UL channel/signal)). Additionally, the proposed method of the present disclosure may be extendedly used by being inter-combined (to a new type of method).
For example, in the present disclosure, a specific threshold value may be pre-defined or may mean a threshold value that is (pre-)configured by a network or base station or a higher layer (including an application layer) of a UE. For example, in the present disclosure, a specific configuration value may be pre-defined or may mean a value that is (pre-)configured by a network or base station or a higher layer (including an application layer) of a UE. For example, an operation that is configured by the network/base station may mean an operation that is (pre-)configured by the base station to the UE via higher layer signaling, or that is configured/signaled by the base station to the UE through a MAC CE, or that is signaled by the base station to the UE through DCI.
Referring to
Additionally or alternatively, the second SCI may further comprise a source ID; and
Additionally or alternatively, based on the source ID and the destination ID included in the second SCI, whether to use the COT from the second device may be determined.
Additionally or alternatively, the destination ID may comprise a destination ID related with the first device.
Additionally or alternatively, the second SCI and MAC (medium access control) protocol data unit (PDU) may be received from the second device, through the PSSCH, and
Additionally or alternatively, the destination ID may include a destination ID related with the MAC PDU.
Additionally or alternatively, the second SCI may further include information related to a zone ID.
Additionally or alternatively, wherein based on the first device being within a first zone related with the zone ID, whether to use the COT from the second device may be determined.
Additionally or alternatively, the second SCI may further comprise information related to a communication range requirement.
Additionally or alternatively, based on the first device being within a distance of the communication range requirement from a location of the second device, whether to use the COT from the second device may be determined.
Additionally or alternatively, the COT may be included within a sidelink (SL) resource pool.
Additionally or alternatively, the first device may perform a transmission within the COT, based on the determination that the COT is used.
Additionally or alternatively, based on reception of hybrid automatic repeat request (HARQ) feedback for the transmission within the COT being expected, HARQ-feedback-enabled transmission may be performed.
Additionally or alternatively, based on reception of hybrid automatic repeat request (HARQ) feedback for the transmission within the COT not being expected, a blind transmission may be performed.
Additionally or alternatively, the first device may select a synchronization reference.
Additionally or alternatively, based on the synchronization reference, whether to use the COT from the second device may be determined.
The proposed method may be applied to an apparatus according to various embodiments of the present disclosure. First, one or more memories 104 of the first device 100, based on being executed by the one or more processors 102, may store instructions to cause the first device (e.g., one or more processors 102, one or more transceiver 106) to perform operations. For example, the operations may include: receiving, from a second device, a radio resource control (RRC) message including information related to whether capability regarding inter-UE coordination (IUC) is supported. For example, the operations may include at least one of: receiving, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); receiving, from the second device, the second SCI through the PSSCH, wherein the second SCI includes a destination ID; and/or determining whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the first device may receive, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH). For example, the first device may receive, from the second device, the second SCI through the PSSCH. For example, the second SCI includes a destination ID. For example, the first device may determine whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a first device adapted to perform wireless communication may be proposed. For example, the first device may include one or more processors; one or more transceivers; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations include at least one of: receiving, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); receiving, from the second device, the second SCI through the PSSCH, wherein the second SCI includes a destination ID; and/or determining whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a processing device adapted to control a first device may be proposed. For example, the processing device may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may comprise at least one of: receiving, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); receiving, from the second device, the second SCI through the PSSCH, wherein the second SCI includes a destination ID; and/or determining whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, at least one non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions that, based on being executed by at least one processor, cause a first device to perform operations. For example, the operations may include at least one of: receiving, from a second device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); receiving, from the second device, the second SCI through the PSSCH, wherein the second SCI includes a destination ID; and/or determining whether to use a channel occupancy time (COT) shared from the second device, based on the destination ID included in the second SCI.
Referring to
Additionally or alternatively, the second SCI may further comprise a source ID; and
Additionally or alternatively, based on the source ID and the destination ID included in the second SCI, whether to use the COT from the second device may be determined.
Additionally or alternatively, the destination ID may comprise a destination ID related with the first device.
Additionally or alternatively, the second SCI and MAC (medium access control) protocol data unit (PDU) may be received from the second device, through the PSSCH, and
Additionally or alternatively, the destination ID may include a destination ID related with the MAC PDU.
Additionally or alternatively, the second SCI may further include information related to a zone ID.
Additionally or alternatively, wherein based on the first device being within a first zone related with the zone ID, whether to use the COT from the second device may be determined.
Additionally or alternatively, the second SCI may further comprise information related to a communication range requirement.
Additionally or alternatively, based on the first device being within a distance of the communication range requirement from a location of the second device, whether to use the COT from the second device may be determined.
Additionally or alternatively, the COT may be included within a sidelink (SL) resource pool.
Additionally or alternatively, the first device may perform a reception within the COT, based on the determination that the COT is used.
Additionally or alternatively, based on reception of hybrid automatic repeat request (HARQ) feedback for the transmission within the COT being expected, HARQ-feedback-enabled transmission may be performed.
Additionally or alternatively, based on reception of hybrid automatic repeat request (HARQ) feedback for the transmission within the COT not being expected, a blind transmission may be performed.
Additionally or alternatively, the second device may select a synchronization reference.
Additionally or alternatively, based on the synchronization reference, whether to use the COT from the second device may be determined.
The proposed method may be applied to a device according to various embodiments of the present disclosure. First, one or more memories 204 of the second device 200, based on being executed by the one or more processors 202, may store instructions to cause the second device (e.g., one or more processors 202, one or more transceiver 206) to perform operations. For example, the operations may include: transmitting, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); and/or transmitting, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the second device may transmit, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH). For example, the second device may transmit, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SC.
According to an embodiment of the present disclosure, A second device adapted to perform wireless communication may be proposed. For example, the second device may comprise: one or more processors; one or more transceivers; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may include at least one of:
transmitting, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); and/or transmitting, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, a processing device adapted to control a second device may be proposed. For example, the processing device may comprise: one or more processors; and one or more memories connected to the one or more processors and storing instructions that, based on being executed, cause the one or more processors to perform operations. For example, the operations may include at least one of: transmitting, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); and/or transmitting, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SCI.
According to an embodiment of the present disclosure, at least one non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions, based on being executed by at least one processor, cause a second device to perform operations. For example, the operations may include at least one of: transmitting, to a first device, a first SCI, for scheduling of a physical sidelink shared channel (PSSCH) and second sidelink control information (SCI), through a physical sidelink control channel (PSCCH); and/or transmitting, to the first device, the second SCI through the PSSCH. For example, the second SCI may include a destination ID. For example, whether to use a channel occupancy time (COT) shared from the second device may be determined, based on the destination ID included in the second SCI.
Various embodiments of the present disclosure may be combined with each other.
Hereinafter, device(s) to which various embodiments of the present disclosure can be applied will be described.
The various descriptions, functions, procedures, proposals, methods, and/or operational flowcharts of the present disclosure described in this document may be applied to, without being limited to, a variety of fields requiring wireless communication/connection (e.g., 5G) between devices.
Hereinafter, a description will be given in more detail with reference to the drawings. In the following drawings/description, the same reference symbols may denote the same or corresponding hardware blocks, software blocks, or functional blocks unless described otherwise.
Referring to
Here, wireless communication technology implemented in wireless devices 100a to 100f of the present disclosure may include Narrowband Internet of Things for low-power communication in addition to LTE, NR, and 6G. In this case, for example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of the LPWAN and may be called by various names including enhanced Machine Type Communication (eMTC), and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee considering the low-power communication, and is not limited to the name described above. As an example, the ZigBee technology may generate personal area networks (PAN) related to small/low-power digital communication based on various standards including IEEE 802.15.4, and the like, and may be called by various names.
The wireless devices 100a to 100f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., Vehicle-to-Vehicle (V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.
Wireless communication/connections 150a, 150b, or 150c may be established between the wireless devices 100a to 100f/BS 200, or BS 200/BS 200. Herein, the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, sidelink communication 150b (or, D2D communication), or inter BS communication (e.g., relay, Integrated Access Backhaul (IAB)). The wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150a and 150b. For example, the wireless communication/connections 150a and 150b may transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.
Referring to
The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 102 may process information within the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including second information/signals through the transceiver 106 and then store information obtained by processing the second information/signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102. For example, the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through one or more antennas 108. Each of the transceiver(s) 106 may include a transmitter and/or a receiver. The transceiver(s) 106 may be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.
The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and/or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 202 may process information within the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202. For example, the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208. Each of the transceiver(s) 206 may include a transmitter and/or a receiver. The transceiver(s) 206 may be interchangeably used with RF unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.
Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Unit (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and/or a set of commands.
The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. The one or more memories 104 and 204 may be configured by Read-Only Memories (ROMs). Random Access Memories (RAMs), Electrically Erasable Programmable Read-Only Memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof. The one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
The one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the methods and/or operational flowcharts of this document, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, through the one or more antennas 108 and 208. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels etc. from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
Referring to
Codewords may be converted into radio signals via the signal processing circuit 1000 of
Specifically, the codewords may be converted into scrambled bit sequences by the scramblers 1010. Scramble sequences used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of a wireless device. The scrambled bit sequences may be modulated to modulation symbol sequences by the modulators 1020. A modulation scheme may include pi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complex modulation symbol sequences may be mapped to one or more transport layers by the layer mapper 1030. Modulation symbols of each transport layer may be mapped (precoded) to corresponding antenna port(s) by the precoder 1040. Outputs z of the precoder 1040 may be obtained by multiplying outputs y of the layer mapper 1030 by an N*M precoding matrix W. Herein, N is the number of antenna ports and M is the number of transport layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) for complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.
The resource mappers 1050 may map modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generators 1060 may generate radio signals from the mapped modulation symbols and the generated radio signals may be transmitted to other devices through each antenna. For this purpose, the signal generators 1060 may include Inverse Fast Fourier Transform (IFFT) modules, Cyclic Prefix (CP) inserters. Digital-to-Analog Converters (DACs), and frequency up-converters.
Signal processing procedures for a signal received in the wireless device may be configured in a reverse manner of the signal processing procedures 1010 to 1060 of
Referring to
The additional components 140 may be variously configured according to types of wireless devices. For example, the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in the form of, without being limited to, the robot (100a of
In
Hereinafter, an example of implementing
Referring to
The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling constituent elements of the hand-held device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/code/commands needed to drive the hand-held device 100. The memory unit 130 may store input/output data/information. The power supply unit 140a may supply power to the hand-held device 100 and include a wired/wireless charging circuit, a battery, etc. The interface unit 140b may support connection of the hand-held device 100 to other external devices. The interface unit 140b may include various ports (e.g., an audio I/O port and a video U/O port) for connection with external devices. The I/O unit 140c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.
As an example, in the case of data communication, the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, images, or video) input by a user and the acquired information/signals may be stored in the memory unit 130. The communication unit 110 may convert the information/signals stored in the memory into radio signals and transmit the converted radio signals to other wireless devices directly or to a BS. The communication unit 110 may receive radio signals from other wireless devices or the BS and then restore the received radio signals into original information/signals. The restored information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, images, video, or haptic) through the I/O unit 140c.
Referring to
The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to drive on a road. The driving unit 140a may include an engine, a motor, a powertrain, a wheel, a brake, a steering device, etc. The power supply unit 140b may supply power to the vehicle or the autonomous vehicle 100 and include a wired/wireless charging circuit, a battery, etc. The sensor unit 140c may acquire a vehicle state, ambient environment information, user information, etc. The sensor unit 140c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement technology for maintaining a lane on which a vehicle is driving, technology for automatically adjusting speed, such as adaptive cruise control, technology for autonomously driving along a determined path, technology for driving by automatically setting a path if a destination is set, and the like.
For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the driving unit 140a such that the vehicle or the autonomous vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain a vehicle state and/or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit 110 may transfer information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server. The external server may predict traffic information data using AI technology, etc., based on the information collected from vehicles or autonomous vehicles and provide the predicted traffic information data to the vehicles or the autonomous vehicles.
Claims in the present description can be combined in a various way. For instance, technical features in method claims of the present description can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2023/003600 | 3/17/2023 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63320710 | Mar 2022 | US | |
| 63320711 | Mar 2022 | US |
