Embodiments of the present application relate to the field of wireless communication, and more specifically, to wireless communication between a plurality of user equipments via the sidelink, SL. Some embodiments relate to a cooperative sensing for sidelink communication.
For data transmission a physical resource grid may be used. The physical resource grid may comprise a set of resource elements to which various physical channels and physical signals are mapped. For example, the physical channels may include the physical downlink, uplink and sidelink shared channels (PDSCH, PUSCH, PSSCH) carrying user specific data, also referred to as downlink, uplink and sidelink payload data, the physical broadcast channel (PBCH) carrying for example a master information block (MIB), the physical downlink shared channel (PDSCH) carrying for example a system information block (SIB), the physical downlink, uplink and sidelink control channels (PDCCH, PUCCH, PSSCH) carrying for example the downlink control information (DCI), the uplink control information (UCI) and the sidelink control information (SCI). For the uplink, the physical channels, or more precisely the transport channels according to 3GPP, may further include the physical random access channel (PRACH or RACH) used by UEs for accessing the network once a UE is synchronized and has obtained the MIB and SIB. The physical signals may comprise reference signals or symbols (RS), synchronization signals and the like. The resource grid may comprise a frame or radio frame having a certain duration in the time domain and having a given bandwidth in the frequency domain. The frame may have a certain number of subframes of a predefined length, e.g., 1 ms. Each subframe may include one or more slots of 12 or 14 OFDM symbols depending on the cyclic prefix (CP) length. All OFDM symbols may be used for DL or UL or only a subset, e.g., when utilizing shortened transmission time intervals (sTTI) or a mini-slot/non-slot-based frame structure comprising just a few OFDM symbols.
The wireless communication system may be any single-tone or multicarrier system using frequency-division multiplexing, like the orthogonal frequency-division multiplexing (OFDM) system, the orthogonal frequency-division multiple access (OFDMA) system, or any other IFFT-based signal with or without CP, e.g., DFT-s-OFDM. Other waveforms, like non-orthogonal waveforms for multiple access, e.g., filter-bank multicarrier (FBMC), generalized frequency division multiplexing (GFDM) or universal filtered multi carrier (UFMC), may be used. The wireless communication system may operate, e.g., in accordance with the LTE-Advanced pro standard or the NR (5G), New Radio, standard.
The wireless network or communication system depicted in
In addition to the above described terrestrial wireless network also non-terrestrial wireless communication networks exist including spaceborne transceivers, like satellites, and/or airborne transceivers, like unmanned aircraft systems. The non-terrestrial wireless communication network or system may operate in a similar way as the terrestrial system described above with reference to
In mobile communication networks, for example in a network like that described above with reference to
When considering two UEs directly communicating with each other over the sidelink, both UEs may be served by the same base station so that the base station may provide sidelink resource allocation configuration or assistance for the UEs. For example, both UEs may be within the coverage area of a base station, like one of the base stations depicted in
When considering two UEs directly communicating with each other over the sidelink, e.g., using the PC5 interface, one of the UEs may also be connected with a BS, and may relay information from the BS to the other UE via the sidelink interface. The relaying may be performed in the same frequency band (in-band-relay) or another frequency band (out-of-band relay) may be used. In the first case, communication on the Uu and on the sidelink may be decoupled using different time slots as in time division duplex, TDD, systems.
Naturally, it is also possible that the first vehicle 202 is covered by the gNB, i.e. connected with Uu to the gNB, wherein the second vehicle 204 is not covered by the gNB and only connected via the PC5 interface to the first vehicle 202, or that the second vehicle is connected via the PC5 interface to the first vehicle 202 but via Uu to another gNB, as will become clear from the discussion of
In a wireless communication system as described above, power saving is crucial for battery-driven UEs.
3GPP Rel.17 [1] has called for investigations and proposals on energy saving for Pedestrian UE (P-UE) in its Work Item (WI) on New Radio (NR) sidelink enhancements. P-UEs usually depend on the lifetime of their batteries, which have a limited capacity. P-UEs which operate on mode 1 or 2 of 5G NR sidelink radio resource allocation need to apply mechanisms to reduce energy consumption and prolong their lifetime. One of the major reasons for depletion of the battery in P-UEs is the continuous sensing which takes place for radio resource selection in the physical layer of such devices. Moreover, the sensing is not always perfect to provide a global view from the radio spectrum.
3GPP [2] has defined two modes of radio resource allocation for sidelink communication in V2X (Vehicle to everything) scenarios, i.e., mode 3 and 4 in LTE and mode 1 and 2 in 5G NR. In mode 4 of LTE and mode 2 of 5G NR, a UE allocates radio resources autonomously without the assistance of eNodeB or gNodeB in in-coverage, partial-coverage, and out-of-coverage cases. A UE can select radio resources applying one of the following mechanisms:
The mechanism to apply for autonomous radio resource selection in the physical layer of a UE is configured by the higher layers using Information Elements (IEs), which are exchanged between layers of the protocol stack.
In all above mentioned mechanisms, in subframe n, a UE shall report a set of resources for transmission of the Physical Sidelink Shared CHannel (PSSCH) and Physical Sidelink Control Channel (PSCCH) to the higher layers.
Candidate Subframe Resources
A candidate single-slot resource, Rxy, for PSSCH is defined according to 3GPP TS 36.213/TS 38.214 as a set of L contiguous sub-channels with sub-channel x+j in single-slot ty where j=0,1, . . . , L−1 and x is the sub-channel starting at the lowest frequency of the resource within the resource pool. The UE shall assume any set of L contiguous sub-channels included in the PSSCH resource pool within the time interval [n+T1, n+T2], where n is the reference subframe for the sensing and resource selection window, with respect to a candidate subframe, T1 and T2 are processing time and packet delay budget. Moreover, the selection of T1 and T2 is up to UE implementations following below conditions:
The total number of the candidate subframes is set by parameter Mtotal.
Random Radio Resource Selection
In case where the IE from higher layers configures the random radio resource selection in a UE, the set of resources to report to the higher layers for PSSCH transmission is defined as follows:
Sensing Based Radio Resource Selection
If sensing or partial sensing-based radio resource selection is configured by the higher layers, the UE shall monitor the radio spectrum to find the occupancy of radio resources and exclude radio resource subframes with a high measured energy level to avoid the collision.
In 5G NR, if the sensing-based radio resource selection is configured by the higher layers, the UE does the following steps:
The radio resource selection for P-UEs is limited to random radio resource selection and partial sensing-based radio resource selection. The type of resource selection for P-UEs is configured by SL-P2X-ResourceSelectionConfigIE [6].
The below example indicates the SL-P2X-ResourceSelectionConfig information element, IE:
In a P-UE configured to the partial sensing, the same steps for the resource selection take place but the physical layer avoids continuous sensing. Instead of the continuous sensing, the P-UE does sensing within the sensing window as follows:
Partial Sensing based on EP 20166532 A1
All the parameters of partial sensing, as mentioned above, can be configured based on the following conditions and state parameters:
Finally, by collection of information, i.e., measurement results of partial sensing, the UE defines set Sa as mentioned earlier and by exclusion of some single-slot resources based on their occupancy rate and the other above-mentioned conditions for sensing based resource selection, it reports Sa to the higher layers.
Sidelink Control Information
When Sa is reported to the higher layer applying any type of resource selection mechanisms, the higher layer (i.e. MAC layer) chooses single-slot resources randomly with a uniform distribution to avoid collision on certain resources. In LTE, after selection of resources, the UE sends Sidelink Control Information (SCI) in the Physical Sidelink Control Channel (PSCCH) which uses the first two Physical Resource Blocks (PRBs) of the first sub-channel if the adjacent PSCCH and PSSCH is configured by higher layers. The SCI informs other UEs in the proximity about the selected resources and help them to decode data messages.
In 5G NR [8], a two stage SCI is introduced in which the 1st stage is used for scheduling of PSSCH and scheduling of 2nd stage SCI on PSSCH. The 1st stage SCI format 0-1 contains the following fields:
In the 2nd stage SCI (format 0-2) the following information is transmitted:
If the 2nd stage SCI format field in the 1st stage SCI indicates a groupcast, the following information is also transmitted in the 2nd stage SCI
ProSe (Proximity Service) Discovery Procedure
For cooperation of UEs in sensing procedure, UEs may have to discover other UEs in their proximity. In 3GPP release 12 [5], following models for ProSe (Proximity Services) Direct Discovery exist.
Model A (“I am here”)
This model defines two roles for the ProSe-enabled UEs that are participating in ProSe Direct Discovery:
In this model the announcing UE broadcasts discovery messages at pre-defined discovery intervals and the monitoring UEs that are interested in these messages read them and process them.
This model is equivalent to “I am here” since the announcing UE would broadcast information about itself e.g. its ProSe Application Identities or ProSe UE Identities in the discovery message.
Model B (“Who is There?”/“Are You There?”)
This model defines two roles for the ProSe-enabled UEs that are participating in ProSe Direct Discovery:
This model is same as “who is there/are you there” since the discoverer UE sends information about other UEs that would like to receive responses from, e.g. the information can be about a ProSe Application Identity corresponding to a group and the members of the group can respond.
In view of the above there is the need to save energy in UEs and enhance the resource selection in P-UEs and Vehicular UEs (V-UEs).
It is noted that the information in the above section is only for enhancing the understanding of the background of the invention and therefore it may contain information that does not form conventional technology and is not already known to a person of ordinary skill in the art.
An embodiment may have a method for sharing sensing information between at least two transceivers of a wireless communication system, the at least two transceivers operating in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the at least two transceivers, the method comprising: performing, with the first transceiver, a continuous or partial sensing of a first set of resources of the sidelink, in order to acquire a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, performing a first sidelink transmission from the first transceiver to a second transceiver of the at least two transceivers, wherein the first sidelink transmission comprises the first sensing information; wherein the first sidelink transmission is a transmission of a second stage sidelink control information.
Another embodiment may have a method for sharing sensing information between at least two transceivers of a wireless communication system, the at least two transceivers operating in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the at least two transceivers, the method comprising: performing, with the first transceiver, a continuous or partial sensing of a first set of resources of the sidelink, in order to acquire a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, performing a first sidelink transmission from the first transceiver to a second transceiver of the at least two transceivers, wherein the first sidelink transmission comprises the first sensing information; wherein the transmission of the first sidelink transmission and/or a periodicity of the transmission of the first sidelink transmission depends on at least one out of a reception of cooperation request requesting a sharing of the sensing information, a quality of service or quality requirement of the first transceiver and/or the second transceiver, and/or of a priority of traffic of the second transceiver, a social's or operator's credit.
Another embodiment may have a first transceiver of a wireless communication system, the first transceiver operating in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, the method comprising: performing a continuous or partial sensing of a first set of resources of the sidelink, in order to acquire a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, performing a first sidelink transmission from the first transceiver to a second transceiver of the wireless communication network, wherein the first sidelink transmission comprises the first sensing information; wherein the first sidelink transmission is a transmission of a second stage sidelink control information.
Another embodiment may have a second transceiver of a wireless communication system, the second transceiver operating in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the second transceiver, the method comprising: receiving a first sidelink transmission from a first transceiver of the wireless communication network, wherein the first sidelink transmission comprises a first sensing information acquired by the first transceiver by performing a continuous or partial sensing of a first set of resources of the sidelink, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink; wherein the first sidelink transmission is a transmission of a second stage sidelink control information.
Another embodiment may have a method for operating a first transceiver of a wireless communication system, the method comprising: operating the first transceiver in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, performing a continuous or partial sensing of a first set of resources of the sidelink, in order to acquire a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, performing a first sidelink transmission from the first transceiver to a second transceiver of the wireless communication network, wherein the first sidelink transmission comprises the first sensing information, wherein the first sidelink transmission is a transmission of a second stage sidelink control information.
Another embodiment may have a method for operating a second transceiver of a wireless communication system, the method comprising: operating the second transceiver in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the second transceiver, receiving a first sidelink transmission from a first transceiver of the wireless communication network, wherein the first sidelink transmission comprises a first sensing information acquired by the first transceiver by performing a continuous or partial sensing of a first set of resources of the sidelink, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink; wherein the first sidelink transmission is a transmission of a second stage sidelink control information.
Another embodiment may have a non-transitory digital storage medium having a computer program stored thereon to perform the method for operating a first transceiver of a wireless communication system, the method comprising: operating the first transceiver in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, performing a continuous or partial sensing of a first set of resources of the sidelink, in order to acquire a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, performing a first sidelink transmission from the first transceiver to a second transceiver of the wireless communication network, wherein the first sidelink transmission comprises the first sensing information, wherein the first sidelink transmission is a transmission of a second stage sidelink control information, when said computer program is run by a computer.
Another embodiment may have a non-transitory digital storage medium having a computer program stored thereon to perform the method for operating a second transceiver of a wireless communication system, the method comprising: operating the second transceiver in a sidelink in-coverage, out of coverage or partial coverage scenario, in which resources for a sidelink communication over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the second transceiver, receiving a first sidelink transmission from a first transceiver of the wireless communication network, wherein the first sidelink transmission comprises a first sensing information acquired by the first transceiver by performing a continuous or partial sensing of a first set of resources of the sidelink, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink; wherein the first sidelink transmission is a transmission of a second stage sidelink control information, when said computer program is run by a computer.
Embodiments of the present invention will be detailed subsequently referring to the appended drawings, in which:
Equal or equivalent elements or elements with equal or equivalent functionality are denoted in the following description by equal or equivalent reference numerals.
In the following description, a plurality of details are set forth to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form rather than in detail in order to avoid obscuring embodiments of the present invention. In addition, features of the different embodiments described hereinafter may be combined with each other, unless specifically noted otherwise.
As indicated in the introductory part of the present patent application, the partial sensing is configured by higher layers to limit the number of sensing time instances and duration and consequently save energy in P-UEs. However, due to the limited measurements applying partial sensing, the selected resources may be unable to fulfill the reliability requirements of an application. The reason for lower reliability applying partial sensing is a higher probability of collisions in the selected resources due to the missing/few sensing instances on the selected resources. To provide the required reliability and latency requirements, a P-UE shall increase the number of time instances and sensing duration to have a better view from available resources. This leads to more power consumption in a P-UE.
Embodiments described herein allow to save energy in UEs and enhance the resource selection in P-UEs and Vehicular UEs (V-UEs) by providing more information for them.
In accordance with embodiments, the cooperation of UEs is proposed in the form of exchanging sensing measurement results or suggestions about unoccupied resources to increase reliability and to reduce the latency of transmissions in sidelink communication by keeping the amount of energy consumption low. By cooperation of UEs, the following benefits can be achieved:
Embodiments of the present invention may be implemented in a wireless communication system or network as depicted in
Embodiments provide a method for sharing sensing information between at least two transceivers 2021 and 2022 [e.g., V-UE 1 and P-UE 1] of a wireless communication system, the at least two transceivers 2021 and 2022 operating in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the at least two transceivers, the method comprising: performing, with the first transceiver 2021 [e.g., V-UE ], a continuous or partial sensing of a first set of resources [e.g., sub-channels, a resource pool or a bandwidth part] of the sidelink, in order to obtain a first sensing information, the first sensing information describing an occupancy [e.g., based on energy level [e.g., RSRP or RSSI]] of at least a proper subset [e.g., Sa] of the first set of resources of the sidelink; performing a first sidelink transmission from the first transceiver 2021 [e.g., V-UE 1] to a second transceiver 2022 [e.g., P-UE 1] of the at least two transceivers 2021 and 2022, wherein the first sidelink transmission comprises the first sensing information.
In embodiments, the first sidelink transmission is one out of
In embodiments, the transmission of the first sidelink transmission and/or a periodicity of the transmission of the first sidelink transmission depends on at least one out of
In embodiments, the first sidelink transmission or another sidelink transmission [e.g., a sidelink transmission of the second transceiver [e.g., P-UE 1] is performed using selected resources selected out of the first set of resources
In embodiments, the first sidelink transmission or another sidelink transmission [e.g., a sidelink transmission of the second transceiver [e.g., P-UE 1] is performed using selected resources only selected out of the first set of resources.
In embodiments, the first sidelink transmission is, for example, a multicast transmission to a proper subset of transceivers of the wireless communication system, the proper subset of transceivers including the second transceiver, wherein transceivers of the proper subset of transceivers fulfill at least one out of the following conditions:
In embodiments, the method further comprises: performing, with the second transceiver or another transceiver of the wireless communication system, a sidelink transmission to the first transceiver [e.g., the first transceiver is the intended receiver], wherein the sidelink transmission is performed using selected resources selected out of the first set of resources
In embodiments, the sidelink transmission is performed using selected resources only selected out of the first set of resources.
In embodiments, the method further comprises performing a second sidelink transmission from the second transceiver [e.g., P-UE 1] to a third transceiver [e.g., P-UE 2] of the at least two transceivers, wherein the second sidelink transmission comprises the first sensing information or an information derived therefrom.
In embodiments, the first sensing information is relayed by means of the second sidelink transmission to the third transceiver.
In embodiments, the second sidelink transmission is one out of
In embodiments, the transmission of the second sidelink transmission and/or a periodicity of the transmission of the second sidelink transmission depends on at least one out of
In embodiments, the second sidelink transmission or another sidelink transmission [e.g., a sidelink transmission of the third transceiver [e.g., P-UE 2]] is performed using selected resources selected out of the first or second set of resources based on the first or second sensing information or the information derived therefrom.
In embodiments, the method further comprises performing, with the second transceiver, a continuous or partial sensing of a second set of resources of the sidelink, in order to obtain a second sensing information, the second sensing information describing an occupancy [e.g., energy level [e.g., RSRP or RSSI]] of at least a proper subset of the second set of resources of the sidelink; performing a second sidelink transmission from the second transceiver to the first transceiver or a third transceiver of the at least two transceivers, wherein the second sidelink transmission comprises one out of
wherein the first set of resources and the second set of resources are the same sets of resources, different sets of resources or partially overlapping sets of resources.
In embodiments, the second sidelink transmission is one out of
In embodiments, the transmission of the second sidelink transmission and/or a periodicity of the transmission of the second sidelink transmission depends on at least one out of
In embodiments, the second sidelink transmission or another sidelink transmission [e.g., of the second transceiver [e.g., P-UE 1] or of a third transceiver] is performed using selected resources selected out of the first set of resources and/or the second set of resources based on the out of
In embodiments, the method further comprises performing a third sidelink transmission by the third transceiver [e.g., P-UE 2], wherein the third sidelink transmission is performed using selected resources selected out of the first set of resources and/or the second set of resources based on the one out of
In embodiments, the first sensing information describes an occupancy [e.g., energy level [e.g., RSRP or RSSI]] only of the proper subset [e.g., Sa] of the first set of resources of the sidelink, the proper subset [e.g., Sa] of the first set of resources including [e.g., only] those resources of the first set of resources fulfilling an occupancy criterium [e.g., energy level [e.g., RSRP or RSSI] equal to or smaller than a predefined threshold] or a set of free resources [e.g. available and not used] or set of resources that are not free [e.g. used by other UEs or energy level above a certain threshold or collision occurred in them or not appropriate for a communication].
In embodiments, the first sensing information describes
In embodiments, the second sensing information describes an occupancy [e.g., energy level [e.g., RSRP or RSSI]] only of the proper subset [e.g., Sa] of the second set of resources of the sidelink, the proper subset [e.g., Sa] of the second set of resources including [e.g., only] those resources of the second set of resources fulfilling an occupancy criterium [e.g., energy level [e.g., RSRP or RSSI] equal to or smaller than a predefined threshold] or a set of free resources [e.g. available and not used] or set of resources that are not free [e.g. used by other UEs or energy level above a certain threshold or collision occurred in them or not appropriate for communication].
In embodiments, the second sensing information describes
In embodiments, the method further comprises transmitting, by the second transceiver [e.g., P-UE ], a sensing information sharing request [e.g., sidelink transmission with a sensing information sharing request] from the second transceiver to the first transceiver [e.g., V-UE ], the sensing information sharing request requesting a sharing of the sensing information of the first transceiver, wherein the first sidelink transmission is transmitted by the first transceiver to the second transceiver in response to the sensing information sharing request.
In embodiments, the method further comprises: transmitting, by the third transceiver [e.g., P-UE 2], a sensing information sharing request [e.g., sidelink transmission with a sensing information sharing request] from the third transceiver to the second transceiver [e.g., P-UE 1], the sensing information sharing request requesting a sharing of the sensing information of the second transceiver, wherein the second sidelink transmission is transmitted by the second transceiver to the third transceiver in response to the sensing information sharing request.
In embodiments, the sensing information request is transmitted by the second transceiver and/or the third transceiver in dependence on at least one out of
In embodiments, the sensing information request is transmitted using at least one out of
In embodiments, the first sidelink transmission and/or the second sidelink transmission is a sidelink transmission, for example for groupcast.
In embodiments, the first sidelink transmission and/or the second sidelink transmission is a groupcast sidelink transmission.
In embodiments, the groupcast sidelink transmission either comprises a control information or implicitly demand by sharing sensing information forcing transceivers that receive the groupcast sidelink transmission to stop performing a continuous or partial sensing.
In embodiments, the first sidelink transmission is transmitted by the first transceiver in response to an external event or in response to a reception of a sensing information sharing request [e.g., received from one transceiver of the at least two transceivers of the wireless communication system, such as a fixed [e.g., non-mobile] transceiver, such as a road side unit, RSU].
In embodiments, the second sidelink transmission is transmitted by the second transceiver in response to a condition or in response to a reception of a sensing information sharing request [e.g., received from one transceiver of the at least two transceivers of the wireless communication system, such as a fixed [e.g., non-mobile] transceiver, such as a road side unit, RSU, or a mobile transceiver [e.g., a mobile RSU]].
In embodiments, the condition is one out of
In embodiments, the first set of resources and the second set of resources are different sets of resources or partially overlapping sets of resources.
In embodiments, the second set of resources on which partial sensing is performed with the second transceiver depends on at least one out of
In embodiments, the partial sensing pattern depends on at least one out of
In embodiments, the method further comprises performing, with a third transceiver, a continuous or partial sensing of a third set of resources [e.g., sub-channels, a resource pool or a bandwidth part] of the sidelink, in order to obtain a third sensing information, the third sensing information describing an occupancy [e.g., energy level [e.g., RSRP or RSSI]] of at least a proper subset [e.g., Sa] of the third set of resources of the sidelink, performing a third sidelink transmission from the third transceiver to the second transceiver [e.g., P-UE ], wherein the third sidelink transmission comprises the third sensing information, performing a second sidelink transmission or groupcast sidelink transmission with the second transceiver, the second sidelink transmission or groupcast transmission comprising
In embodiments, the first or second sidelink transmission or groupcast sidelink transmission [e.g., relaying the first and/or second sensing information or the information derived therefrom] is transmitted by the first or second transceiver or any transmitter within a groupcast communication in dependence on at least one out of
In embodiments, the method further comprises performing, with the second transceiver, a continuous or partial sensing of a second set of resources of the sidelink, in order to obtain a second sensing information, the second sensing information describing an occupancy [e.g., energy level [e.g., RSRP or RSSI]] of at least a proper subset of the second set of resources of the sidelink, wherein the second sidelink transmission comprises one out of:
In embodiments, the second transceiver is UE, e.g. a battery-operated UE.
In embodiments, the second transceiver is, for example, a vulnerable road user equipment, VRU-UE [e.g., a pedestrian UE] or a vehicular mounted UE [e.g., V-UE].
In embodiments, the method further comprises: receiving, with the first transceiver, a first assistance information from the second transceiver, the first assistance information indicating a set of resources preferred or not preferred for a reception of the first sidelink transmission; and selecting, with the first transceiver, a set of resources for the first sidelink transmission in dependence on the first assistance information.
In embodiments, the method further comprises: receiving, with the second transceiver, a second assistance information from the third transceiver, the second assistance information indicating a set of resources preferred or not preferred for a reception of the second sidelink transmission; and selecting, with the second transceiver, a set of resources for the second sidelink transmission in dependence on the second assistance information.
In embodiments, the first sidelink transmission is transmitted by the first transceiver in response to a fulfillment of a first cooperative sensing condition.
In embodiments, the first cooperative sensing condition is at least one out of
In embodiments, the second sidelink transmission is transmitted by the second transceiver in response to a fulfillment of a second cooperative sensing condition.
In embodiments, the first cooperative sensing condition is at least one out of
Further embodiments provide a first transceiver of a wireless communication system, wherein the first transceiver is configured to operate in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which the transceiver is configured or preconfigured to allocate or schedule resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink autonomously or network controlled, wherein the first transceiver is configured to perform a continuous or partial sensing of a first set of resources [e.g., sub-channels, a resource pool or a bandwidth part] of the sidelink, in order to obtain a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, wherein the first transceiver is configured to perform a first sidelink transmission from the first transceiver to a second transceiver of the wireless communication system, wherein the first sidelink transmission comprises the first sensing information.
Further embodiments provide a second transceiver of a wireless communication system, wherein the second transceiver is configured to operate in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which the transceiver is configured or preconfigured to allocate or schedule resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink autonomously or network controlled, wherein the second transceiver is configured to receive a first sidelink communication from a first transceiver of the wireless communication system, the first sidelink communication comprising a first sensing information, the first sensing information describing an occupancy of at least a part of a proper subset of resources of the sidelink, wherein the second transceiver is configured to perform a second sidelink transmission from the second transceiver to a third transceiver of the wireless communication system, wherein the second sidelink transmission comprises the first sensing information or an information derived therefrom.
In embodiments, the second transceiver is further configured to perform a continuous or partial sensing of a second set of resources of the sidelink, in order to obtain a second sensing information, the second sensing information describing an occupancy of at least a proper subset of the second set of resources of the sidelink, wherein the second sidelink transmission comprises:
wherein the first set of resources and the second set of resources are the same sets of resources, different sets of resources or partially overlapping sets of resources.
Further embodiments provide a method for sharing sensing information with a first transceiver [e.g., V-UE 1] of a wireless communication system, the first transceiver operating in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the at least two transceivers, the method comprising: performing a continuous or partial sensing of a first set of resources [e.g., sub-channels, a resource pool or a bandwidth part] of the sidelink, in order to obtain a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink; performing a first sidelink transmission from the first transceiver to a second transceiver of the wireless communication system, wherein the first sidelink transmission comprises the first sensing information.
Further embodiments provide a method for sharing sensing information with a second transceiver [e.g., P-UE 1] of a wireless communication system, the second transceiver operating in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the at least two transceivers, the method comprising: receiving a first sidelink communication from a first transceiver of the wireless communication system, the first sidelink communication comprising a first sensing information, the first sensing information describing an occupancy of at least a proper subset of resources of the sidelink; performing a second sidelink transmission from the second transceiver to a third transceiver of the wireless communication system, wherein the second sidelink transmission comprises the first sensing information or an information derived therefrom.
Further embodiments provide a first transceiver of a wireless communication system, wherein the first transceiver is configured to operate in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, wherein the first transceiver is configured to perform a continuous or partial sensing of a first set of resources [e.g., sub-channels, a resource pool or a bandwidth part] of the sidelink, in order to obtain a first sensing information, the first sensing information describing an occupancy [e.g., based on energy level [e.g., RSRP or RSSI]] of at least a proper subset [e.g., Sa] of the first set of resources of the sidelink, wherein the first transceiver is configured to perform a first sidelink transmission to a second transceiver of the wireless communication system, wherein the first sidelink transmission comprises the first sensing information.
In embodiments, the first transceiver is configured to receive a sidelink transmission from the second transceiver or another transceiver of the wireless communication system, wherein the sidelink transmission is performed using selected resources selected [e.g., only] out of the first set of resources [e.g., only] based on the first sensing information or an information derived therefrom.
Further embodiments provide a second transceiver of a wireless communication system, wherein the second transceiver is configured to operate in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, wherein the second transceiver is configured to receive a first sidelink transmission from a first transceiver of the wireless communication system, wherein the first sidelink transmission comprises the first sensing information, wherein the second transceiver is configured to perform a second sidelink transmission to a third transceiver of the wireless communication system, wherein the second sidelink transmission comprises the first sensing information or an information derived therefrom.
In embodiments, the second transceiver is configured to relay the first sensing information by means of the second sidelink transmission to the third transceiver.
In embodiments, the second transceiver is configured to perform a continuous or partial sensing of a second set of resources of the sidelink, in order to obtain a second sensing information, the second sensing information describing an occupancy [e.g., energy level [e.g., RSRP or RSSI]] of at least a proper subset of the second set of resources of the sidelink, wherein the second sidelink transmission comprises one out of
Further embodiments provide a second transceiver of a wireless communication system, wherein the second transceiver is configured to operate in a sidelink in-coverage, out of coverage or partial coverage scenario [e.g., NR sidelink mode [e.g., mode 1 or mode 2]], in which resources for a sidelink communication [e.g., transmission and/or reception] over a sidelink are pre-configured by the wireless communication system or allocated or scheduled autonomously by the first transceiver, wherein the second transceiver is configured to receive a first sidelink transmission from a first transceiver of the wireless communication system, wherein the first sidelink transmission comprises a first sensing information, the first sensing information describing an occupancy [e.g., based on energy level [e.g., RSRP or RSSI]] of at least a proper subset [e.g., Sa] of a first set of resources of the sidelink, wherein the second transceiver is configured to perform a second sidelink transmission to the first transceiver or another transceivers of the wireless communication system, wherein the second sidelink transmission is performed using selected resources selected out of the first set of resources only based on the first sensing information.
Further embodiments provide a wireless communication system comprising a first transceiver and a second transceiver.
In embodiments, UEs do (or are configured to perform) sensing/partial sensing based on the higher layers configuration.
In embodiments, a UE shares (or is configured to share) the results of its sensing procedure (for example, a set of measurements from resources or set of resources which a UE is not utilized or recommend to other UE(s) to utilize or the UE does not recommend other UE(s) to utilize) or relays (or is configured to relay) the received sensing results (for example a set of measurements from resources or set of resources which a UE is not utilized or recommend to other UE(s) to utilize or the UE does not recommend other UE(s) to utilize) of other UEs with/without integration of them with its own sensing results or obtained resources applying for example one (or more) of the following options:
In embodiments, the conditions and the periodicity of sharing sensing results with other UEs in the proximity depend on at least one parameter, examples of parameters are:
In embodiments, P-UEs may optionally request for cooperation of other UEs in the proximity if they are at least in one of the following states:
In embodiments, P-UEs may optionally request for cooperation applying at least one of the following options:
The first transceiver 2021 can be configured to perform a continuous or partial sensing of a first set of resources of the sidelink, in order to obtain a first sensing information, the first sensing information describing an occupancy of at least a proper subset of the first set of resources of the sidelink, and to perform a first sidelink transmission 2031 from the first transceiver 2021 (e.g., V-UE 1) to the second transceiver 2022 (e.g., P-UE 1) of the at least two transceivers, wherein the first sidelink transmission 2031 comprises the first sensing information.
The second transceiver 2022 (e.g., P-UE 1) can be configured to perform a second sidelink transmission 2032 to a third transceiver 2023 (e.g., P-UE 3), wherein the second sidelink transmission 2032 comprises the first sensing information or an information derived therefrom. For example, the second transceiver 2022 (e.g., P-UE 1) can be configured to relay the first sensing information to the third transceiver 2023 (e.g., P-UE 3) by means of the second sidelink transmission 2032. For example, the second transceiver 2022 (e.g., P-UE 1) can be configured to perform a continuous or partial sensing of a second set of resources of the sidelink, in order to obtain a second sensing information, the second sensing information describing an occupancy of at least a proper subset of the second set of resources of the sidelink, wherein the second sidelink transmission comprises one out of (1) the first sensing information and the second sensing information, (2) an updated sensing information obtained by updating the first sensing information based on the second sensing information, (3) a combined sensing information derived from a combination of the first sensing information and the second sensing information, wherein the first set of resources and the second set of resources are the same sets of resources, different sets of resources or partially overlapping sets of resources.
Further, the first transceiver 2021 (e.g., V-UE 1) naturally can also be configured to perform a third sidelink 2033 transmission to a fourth transceiver 2024 (e.g., V-UE2), the third sidelink 2033 transmission comprising the first sensing information, and/or a fourth sidelink 2034 transmission to a fifth transceiver 2025 (e.g., P-UE 2), the third sidelink 2033 transmission comprising the first sensing information. The first sidelink transmission 2031, the third sidelink 2033 transmission and the fourth sidelink transmission 2034 could also be performed by means of a multicast transmission to the second transceiver 2022, the fourth transceiver 2024 and the fifth transceiver 2025.
In other words,
Subsequently, embodiments of the present invention are described in further detail.
In embodiments, UEs share (or are configured to share) their sensing information and/or relay (or are configured to relay) received sensing information from other UEs to cooperate, aiming on energy saving in battery-dependent UEs and increasing the reliability and reducing the latency in sidelink communication. Relay UEs may integrate the received sensing information with each other or with their own sensing information before relaying the information.
In embodiments, additionally or alternatively UEs share (or are configured to share) a set of resources (e.g., a set of free/busy resources or a set of resources that causes a collision at UE B, for example, due to the hidden terminal problem/half duplex problem or a set of resources that are not utilized due to the exposed terminal problem) or relay (or are configured to relay) received sensing information from other UEs or from a RSU or gNB to the intended receiver(s), e.g, UE B, aiming at energy saving and increasing the reliability and reducing the latency in sidelink communication and increasing spectral efficiency. Relay UEs may integrate the received sensing information with each other or with their own sensing information before relaying the information.
For example, a UE undertakes the following steps to cooperate with other UEs:
Or for example undertakes the following steps:
Or for example a UE undertakes the following steps:
Or for example a UE undertakes the following steps:
In embodiments, the UE which shares the coordination/cooperative/sensing information/messages (e.g., set of resources, sensing results, preferred/not preferred resources, existing or possible collisions in a set of resources) might be the intended receiver, i.e., the UE monitoring the resources for reception on the resources or not.
In embodiments, the results of the sensing procedure can be shared with other UEs using for example one of the following options:
where, Xis in between 1-2000.
The results of the sensing procedure might be shared with all UEs receiving the result of the sensing procedure from the sharing UE or might be shared with those UEs only, when at least one of the following conditions applies:
In embodiments, a UE may ask other UEs in the proximity to share their sensing information using for example one of the following options:
In other words,
In embodiments, UEs may start sharing (or be configured to start sharing) sensing results with/without receiving a cooperation request based on Embodiment 3 and/or on one or any number conditions. The conditions might be:
In other words,
This embodiment assumes that several UEs (usually P-UEs) perform partial sensing and share their sensing results to get the full sensing results. One possibility could be to consider cooperative partial sensing for UEs in groupcast. Each member UE of the group could sense a defined part of a resource pool or a defined resource pool. Free resources could be shared as defined in embodiment 2.
Examples of how to perform partial sensing are listed below:
In embodiments, a P-UE or V-UE may just integrate received information from other UEs and broadcast them.
In Embodiments, a P-UE may offer relaying role to other P-UEs, e.g., a UE receives sensing information from a V-UE.
In embodiments, a P-UE or V-UE may just relay received sensing information from other UEs. For example, a validity zone of sensing information may be considered. For example, other parameters like the relative distance or range between the UEs, e.g., sidelink positioning, may be considered.
In embodiments, a UE may integrate its sensing results with the received sensing results from other UEs (e.g., exclusion of some resources, consideration of some resources) for its own resource selection or generation of new cooperative messages to be shared with other UEs.
In embodiments, a UE may do reselection on its selected resources for its transmissions based on the fusion of the received sensing information from other UEs and the outcome of its own sensing procedure.
In embodiments, in resource allocation Mode 2, a UE may transmit the sensing information if the nearby users request for only transmitting time instances indicated in the control information, when the cooperative sensing is configured by the higher layer signaling, e.g., RRC messages or SCI information.
In embodiments, the cooperation of UEs in form of exchanging sensing results or a set of resources to transmit/receive or not to transmit/receive can be triggered by at least one out of:
In embodiments, a UE might use the received cooperative/coordination information from other UE(s) (e.g., set of resources, sensing results, information about existing/possible collision on some resources) and apply them in its resource (re-)selection.
In embodiments, the UE might do the resource selection only based on the received cooperative/coordination/sensing information from other UEs or based on its own sensing results and the received cooperative/coordination/sensing information.
Although some aspects have been described in the context of an apparatus, it is clear that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus. Some or all of the method steps may be executed by (or using) a hardware apparatus, like for example, a microprocessor, a programmable computer or an electronic circuit. In some embodiments, one or more of the most important method steps may be executed by such an apparatus.
Various elements and features of the present invention may be implemented in hardware using analog and/or digital circuits, in software, through the execution of instructions by one or more general purpose or special-purpose processors, or as a combination of hardware and software. For example, embodiments of the present invention may be implemented in the environment of a computer system or another processing system.
The terms “computer program medium” and “computer readable medium” are used to generally refer to tangible storage media such as removable storage units or a hard disk installed in a hard disk drive. These computer program products are means for providing software to the computer system 500. The computer programs, also referred to as computer control logic, are stored in main memory 506 and/or secondary memory 508. Computer programs may also be received via the communications interface 510. The computer program, when executed, enables the computer system 500 to implement the present invention. In particular, the computer program, when executed, enables processor 502 to implement the processes of the present invention, such as any of the methods described herein. Accordingly, such a computer program may represent a controller of the computer system 500. Where the disclosure is implemented using software, the software may be stored in a computer program product and loaded into computer system 500 using a removable storage drive, an interface, like communications interface 510.
Depending on certain implementation requirements, embodiments of the invention can be implemented in hardware or in software. The implementation can be performed using a digital storage medium, for example a floppy disk, a DVD, a Blu-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate (or are capable of cooperating) with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
Some embodiments according to the invention comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
Generally, embodiments of the present invention can be implemented as a computer program product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer. The program code may for example be stored on a machine readable carrier.
Other embodiments comprise the computer program for performing one of the methods described herein, stored on a machine readable carrier.
In other words, an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.
A further embodiment of the inventive methods is, therefore, a data carrier (or a digital storage medium, or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein. The data carrier, the digital storage medium or the recorded medium are typically tangible and/or non-transitionary.
A further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein. The data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet.
A further embodiment comprises a processing means, for example a computer, or a programmable logic device, configured to or adapted to perform one of the methods described herein.
A further embodiment comprises a computer having installed thereon the computer program for performing one of the methods described herein.
A further embodiment according to the invention comprises an apparatus or a system configured to transfer (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver. The receiver may, for example, be a computer, a mobile device, a memory device or the like. The apparatus or system may, for example, comprise a file server for transferring the computer program to the receiver.
In some embodiments, a programmable logic device (for example a field programmable gate array) may be used to perform some or all of the functionalities of the methods described herein. In some embodiments, a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein. Generally, the methods are preferably performed by any hardware apparatus.
The apparatus described herein may be implemented using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.
The apparatus described herein, or any components of the apparatus described herein, may be implemented at least partially in hardware and/or in software.
The methods described herein may be performed using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.
The methods described herein, or any components of the apparatus described herein, may be performed at least partially by hardware and/or by software.
While this invention has been described in terms of several embodiments, there are alterations, permutations, and equivalents which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations and equivalents as fall within the true spirit and scope of the present invention.
[1] RP-193231: New WID on NR sidelink enhancement, December 2019
[2] TS 36.213
[3] TS 36.212
[4] TS 23.285
[5] TS 23.303
[6] TS 36.331
[7] TS 38.214
[8] TS 38.212
Number | Date | Country | Kind |
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20176138.4 | May 2020 | EP | regional |
20203435.1 | Oct 2020 | EP | regional |
This application is a continuation of copending International Application No. PCT/EP2021/063708, filed May 21, 2021, which is incorporated herein by reference in its entirety, and additionally claims priority from European Applications Nos. EP 20 176 138.4, filed May 22, 2020, and EP 20 203 435.1, filed Oct. 22, 2020, all of which are incorporated herein by reference in their entirety.
Number | Date | Country | |
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Parent | PCT/EP2021/063708 | May 2021 | US |
Child | 17991481 | US |