Patent Application
20230371015
This disclosure generally relates to wireless communication networks and, more particularly, to a method and apparatus for bandwidth part pairing in a wireless communication system.
With the rapid rise in demand for communication of large amounts of data to and from mobile communication devices, traditional mobile voice communication networks are evolving into networks that communicate with Internet Protocol (IP) data packets. Such IP data packet communication can provide users of mobile communication devices with voice over IP, multimedia, multicast and on-demand communication services.
An exemplary network structure is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN system can provide high data throughput in order to realize the above-noted voice over IP and multimedia services. A new radio technology for the next generation (e.g., 5G) is currently being discussed by the 3GPP standards organization. Accordingly, changes to the current body of 3GPP standard are currently being submitted and considered to evolve and finalize the 3GPP standard.
Methods, systems, and apparatuses are provided for a UE in a wireless communication system to make Bandwidth Part (BWP) operation for duplexing enhancement more efficient. The method can comprise operating in unpaired spectrum, receiving configuration of one or more Downlink (DL) BWPs and configuration of one or more Uplink (UL) BWPs, wherein an active DL BWP among the one or more DL BWPs and an active UL BWP among the one or more UL BWPs have different center frequencies if the UE is indicated that different center frequencies for active UL BWP and active DL BWP are allowed, and receiving DL reception within the active DL BWP and transmitting UL transmission within the active UL BWP.
In various embodiments, a method for a UE in a wireless communication system can comprise operating in unpaired spectrum, being configured with one or more DL Resource Block (RB) sets and one or more UL RB sets on a symbol, performing an UL transmission on the symbol if a frequency resource of the UL transmission is within the one or more UL RB sets, and canceling the UL transmission on the symbol if the frequency resource of the UL transmission is not within the one or more UL RB sets.
The invention described herein can be applied to or implemented in exemplary wireless communication systems and devices described below. In addition, the invention is described mainly in the context of the 3GPP architecture reference model. However, it is understood that with the disclosed information, one skilled in the art could easily adapt for use and implement aspects of the invention in a 3GPP2 network architecture as well as in other network architectures.
The exemplary wireless communication systems and devices described below employ a wireless communication system, supporting a broadcast service. Wireless communication systems are widely deployed to provide various types of communication such as voice, data, and so on. These systems may be based on code division multiple access (CDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3GPP LTE (Long Term Evolution) wireless access, 3GPP LTE-A (Long Term Evolution Advanced) wireless access, 3GPP2 UMB (Ultra Mobile Broadband), WiMax, 3GPP NR (New Radio), or some other modulation techniques.
In particular, the exemplary wireless communication systems and devices described below may be designed to support one or more standards such as the standard offered by a consortium named “3rd Generation Partnership Project” referred to herein as 3GPP, including: [1] 3GPP TS 38.211 V15.7.0, “NR physical channels and modulation”; [2] 3GPP TS 38.213 V16.6.0, “NR Physical layer procedures for control”; [3] 3GPP TS 38.321 V16.7.0, “NR MAC protocol specification”; and [4] RP-212707, “Draft SID on Evolution of NR Duplex Operation”. The standards and documents listed above are hereby expressly and fully incorporated herein by reference in their entirety.
Each group of antennas and/or the area in which they are designed to communicate is often referred to as a sector of the access network. In the embodiment, antenna groups each are designed to communicate to access terminals in a sector of the areas covered by access network 100.
In communication over forward links 120 and 126, the transmitting antennas of access network 100 may utilize beamforming in order to improve the signal-to-noise ratio of forward links for the different access terminals 116 and 122. Also, an access network using beamforming to transmit to access terminals scattered randomly through its coverage normally causes less interference to access terminals in neighboring cells than an access network transmitting through a single antenna to all its access terminals.
The AN may be a fixed station or base station used for communicating with the terminals and may also be referred to as an access point, a Node B, a base station, an enhanced base station, an eNodeB, or some other terminology. The AT may also be called User Equipment (UE), a wireless communication device, terminal, access terminal or some other terminology.
In one embodiment, each data stream is transmitted over a respective transmit antenna. TX data processor 214 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.
The coded data for each data stream may be multiplexed with pilot data using OFDM techniques. The pilot data is typically a known data pattern that is processed in a known manner and may be used at the receiver system to estimate the channel response. The multiplexed pilot and coded data for each data stream is then modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QPSK, M-PSK, or M-QAM) selected for that data stream to provide modulation symbols. The data rate, coding, and modulation for each data stream may be determined by instructions performed by processor 230. A memory 232 is coupled to processor 230.
The modulation symbols for all data streams are then provided to a TX MIMO processor 220, which may further process the modulation symbols (e.g., for OFDM). TX MIMO processor 220 then provides NT modulation symbol streams to NT transmitters (TMTR) 222a through 222t. In certain embodiments, TX MIMO processor 220 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. NT modulated signals from transmitters 222a through 222t are then transmitted from NT antennas 224a through 224t, respectively.
At receiver system 250, the transmitted modulated signals are received by NR antennas 252a through 252r and the received signal from each antenna 252 is provided to a respective receiver (RCVR) 254a through 254r. Each receiver 254 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.
An RX data processor 260 then receives and processes the NR received symbol streams from NR receivers 254 based on a particular receiver processing technique to provide NT “detected” symbol streams. The RX data processor 260 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for the data stream. The processing by RX data processor 260 is complementary to that performed by TX MIMO processor 220 and TX data processor 214 at transmitter system 210.
A processor 270 periodically determines which pre-coding matrix to use (discussed below). Processor 270 formulates a reverse link message comprising a matrix index portion and a rank value portion.
The reverse link message may comprise various types of information regarding the communication link and/or the received data stream. The reverse link message is then processed by a TX data processor 238, which also receives traffic data for a number of data streams from a data source 236, modulated by a modulator 280, conditioned by transmitters 254a through 254r, and transmitted back to transmitter system 210.
At transmitter system 210, the modulated signals from receiver system 250 are received by antennas 224, conditioned by receivers 222, demodulated by a demodulator 240, and processed by a RX data processor 242 to extract the reserve link message transmitted by the receiver system 250. Processor 230 then determines which pre-coding matrix to use for determining the beamforming weights then processes the extracted message.
Memory 232 may be used to temporarily store some buffered/computational data from 240 or 242 through Processor 230, store some buffed data from 212, or store some specific program codes. And Memory 272 may be used to temporarily store some buffered/computational data from 260 through Processor 270, store some buffed data from 236, or store some specific program codes.
Turning to
For LTE, LTE-A, or NR systems, the Layer 2 portion 404 may include a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer. The Layer 3 portion 402 may include a Radio Resource Control (RRC) layer.
Any two or more than two of the following paragraphs, (sub-)bullets, points, actions, or claims described in each invention paragraph or section may be combined logically, reasonably, and properly to form a specific method.
Any sentence, paragraph, (sub-)bullet, point, action, or claim described in each of the following invention paragraphs or sections may be implemented independently and separately to form a specific method or apparatus. Dependency, e.g., “based on”, “more specifically”, “example”, etc., in the following invention disclosure is just one possible embodiment which would not restrict the specific method or apparatus.
Frame structure used in New RAT (NR) for 5G, to accommodate various types of requirements (e.g., [1] 3GPP TS 38.211 V15.7.0, “NR physical channels and modulation”) for time and frequency resource, e.g., from ultra-low latency (˜0.5 ms) to delay-tolerant traffic for Machine Type Communication (MTC), from high peak rate for enhanced Mobile Broadband (eMBB) to very low data rate for MTC. An important focus of this study is low latency aspect, e.g., short Transmission Time Interval (TTI), while other aspects of mixing/adapting different TTIs can also be considered in the study. In addition to diverse services and requirements, forward compatibility is an important consideration in initial NR frame structure design as not all features of NR would be included in the beginning phase/release.
Reducing latency of protocol is an important improvement between different generations/releases, which can improve efficiency as well as meeting new application requirements, e.g., real-time service. An effective method frequently adopted to reduce latency is to reduce the length of TTIs, from 10 ms in 3G to 1 ms in LTE.
When it comes to NR, the story becomes somehow different, as backward compatibility is not a must. Numerology can be adjusted so that reducing symbol number of a TTI would not be the only tool to change TTI length. Using LTE numerology as an example, it comprises 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols in 1 ms and a subcarrier spacing of 15 KHz. When the subcarrier spacing goes to 30 KHz, under the assumption of same Fast Fourier Transform (FFT) size and same Cyclic Prefix (CP) structure, there would be 28 OFDM symbols in 1 ms, equivalently the TTI become 0.5 ms if the number of OFDM symbols in a TTI is kept the same. This implies the design between different TTI lengths can be kept common, with good scalability performed on the subcarrier spacing. Of course, there would always be trade-offs for the subcarrier spacing selection, e.g., FFT size, definition/number of Physical Resource Block (PRB), the design of CP, supportable system bandwidth, etc. While as NR considers larger system bandwidth, and larger coherence bandwidth, inclusion of a larger sub carrier spacing is a natural choice.
More details of NR frame structure, channel, and numerology design is given below from [1] 3GPP TS 38.211 V15.7.0, “NR physical channels and modulation”:
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4 Frame Structure and Physical Resources
4.1 General
Throughout this specification, unless otherwise noted, the size of various fields in the time domain is expressed in time units Tc=1/(Δfmax) where Δfmax=480·103 Hz and Nf=4096. The constant κ=Ts/Tc=64 where Ts=1/(Δfref·Nf,ref), Δfref=15·103 Hz and Nf,ref=2048.
4.2 Numerologies
Multiple OFDM numerologies are supported as given by Table 4.2-1 where it and the cyclic prefix for a bandwidth part are obtained from the higher-layer parameter subcarrierSpacing and cyclicPrefix, respectively.
4.3 Frame Structure
4.3.1 Frames and Subframes
Downlink and uplink transmissions are organized into frames with Tf=(ΔfmaxNf/100)·Tc=10 ms duration, each consisting of ten subframes of Tsf=(ΔfmaxNf/1000)=1 ms duration. The number of consecutive OFDM symbols per subframe is Nsymbsubframe,μ=NsymbslotNslotsubframe,μ. Each frame is divided into two equally-sized half-frames of five subframes each with half-frame 0 consisting of subframes 0-4 and half-frame 1 consisting of subframes 5-9.
There is one set of frames in the uplink and one set of frames in the downlink on a carrier.
Uplink frame number i for transmission from the UE shall start TTA=(NTA+NTA,offset)Tc before the start of the corresponding downlink frame at the UE where NTAoffset is given by [5, TS 38.213].
4.3.2 Slots
For subcarrier spacing configuration, slots are numbered nsμ∈{0, . . . , Nslotsubframe,μ−1} in increasing order within a subframe and ns,fμ∈{0, . . . , Nslotsubframe,μ−1} in increasing order within a frame. There are Nsymbslot consecutive OFDM symbols in a slot where Nsymbslot depends on the cyclic prefix as given by Tables 4.3.2-1 and 4.3.2-2. The start of slot nsμ in a subframe is aligned in time with the start of OFDM symbol nsμ Nsymbslot in the same subframe.
OFDM symbols in a slot can be classified as ‘downlink’, ‘flexible’, or ‘uplink’. Signaling of slot formats is described in subclause 11.1 of [5, TS 38.213].
In a slot in a downlink frame, the UE shall assume that downlink transmissions only occur in ‘downlink’ or ‘flexible’ symbols.
In a slot in an uplink frame, the UE shall only transmit in ‘uplink’ or ‘flexible’ symbols.
A UE not capable of full-duplex communication and not supporting simultaneous transmission and reception as defined by paremeter simultaneousRxTxInterBandENDC, simultaneousRxTxInterBandCA or simultaneousRxTxSUL [10, TS 38.306] among all cells within a group of cells is not expected to transmit in the uplink in one cell within the group of cells earlier than NRx-TxTc, after the end of the last received downlink symbol in the same or different cell within the group of cells where NRx-Tx, is given by Table 4.3.2-3.
A UE not capable of full-duplex communication and not supporting simultaneous transmission and reception as defined by parameter simultaneousRxTxInterBandENDC, simultaneousRxTxInterBandCA or simultaneousRxTxSUL [10, TS 38.306] among all cells within a group of cells is not expected to receive in the downlink in one cell within the group of cells earlier than NRx-TxTc, after the end of the last transmitted uplink symbol in the same or different cell within the group of cells where NRx-Tx, is given by Table 4.3.2-3.
A UE not capable of full-duplex communication is not expected to transmit in the uplink earlier than NRx-TxTc, after the end of the last received downlink symbol in the same cell where NRx-Tx is given by Table 4.3.2-3.
A UE not capable of full-duplex communication is not expected to receive in the downlink earlier than NRx-TxTc, after the end of the last transmitted uplink symbol in the same cell where NRx-Tx is given by Table 4.3.2-3.
4.4 Physical Resources
4.4.1 Antenna Ports
An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed.
For DM-RS associated with a PDSCH, the channel over which a PDSCH symbol on one antenna port is conveyed can be inferred from the channel over which a DM-RS symbol on the same antenna port is conveyed only if the two symbols are within the same resource as the scheduled PDSCH, in the same slot, and in the same PRG as described in clause 5.1.2.3 of [6, TS 38.214].
For DM-RS associated with a PDCCH, the channel over which a PDCCH symbol on one antenna port is conveyed can be inferred from the channel over which a DM-RS symbol on the same antenna port is conveyed only if the two symbols are within resources for which the UE may assume the same precoding being used as described in clause 7.3.2.2.
For DM-RS associated with a PBCH, the channel over which a PBCH symbol on one antenna port is conveyed can be inferred from the channel over which a DM-RS symbol on the same antenna port is conveyed only if the two symbols are within a SS/PBCH block transmitted within the same slot, and with the same block index according to clause 7.4.3.1.
Two antenna ports are said to be quasi co-located if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.
4.4.2 Resource Grid
For each numerology and carrier, a resource grid of Ngrid,xsize,μNscRB subcarriers and Nsymbsubframe,μOFDM symbols is defined, starting at common resource block Ngridstart,μ indicated by higher-layer signalling. There is one set of resource grids per transmission direction (uplink or downlink) with the subscript x set to DL and UL for downlink and uplink, respectively. When there is no risk for confusion, the subscript x may be dropped. There is one resource grid for a given antenna port p, subcarrier spacing configuration μ, and transmission direction (downlink or uplink).
The carrier bandwidth Ngridsize,μ a for subcarrier spacing configuration μ is given by the higher-layer parameter grid carrierBandwidth in the SCS-SpecificCarrier IE. The starting position Ngridsize,μ for subcarrier spacing configuration μ is given by the higher-layer parameter offsetToCarrier in the SCS-SpecificCarrier IE.
The frequency location of a subcarrier refers to the center frequency of that subcarrier.
For the downlink, the higher-layer parameter txDirectCurrentLocation in the SCS-Specific Carrier IE indicates the location of the transmitter DC subcarrier in the downlink for each of the numerologies configured in the downlink. Values in the range 0-3299 represent the number of the DC subcarrier and the value 3300 indicates that the DC subcarrier is located outside the resource grid.
For the uplink, the higher-layer parameter txDirectCurrentLocation in the UplinkTxDirectCurrentBWP IE indicates the location of the transmitter DC subcarrier in the uplink for each of the configured bandwidth parts, including whether the DC subcarrier location is offset by 7.5 kHz relative to the center of the indicated subcarrier or not. Values in the range 0-3299 represent the number of the DC subcarrier, the value 3300 indicates that the DC subcarrier is located outside the resource grid, and the value 3301 indicates that the position of the DC subcarrier in the uplink is undetermined.
4.4.3 Resource Elements
Each element in the resource grid for antenna port p and subcarrier spacing configuration μ is called a resource element and is uniquely identified by (k,l)p,μ where k is the index in the frequency domain and 1 refers to the symbol position in the time domain relative to some reference point. Resource element (k,l)p,μ corresponds to a physical resource and the complex value ak,l(p,μ). When there is no risk for confusion, or no particular antenna port or subcarrier spacing is specified, the indices p and μ may be dropped, resulting in ak,l(p) or ak,l.
4.4.4 Resource Blocks
4.4.4.1 General
A resource block is defined as NscRB=12 consecutive subcarriers in the frequency domain.
4.4.4.2 Point A
Point A serves as a common reference point for resource block grids and is obtained from:
4.4.4.3 Common Resource Blocks
Common resource blocks are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration μ. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ coincides with ‘point A’.
The relation between the common resource block number nCRBμ in the frequency domain and resource elements (k,l) for subcarrier spacing configuration μ is given by
where k is defined relative to point A such that k=0 corresponds to the subcarrier centered around point A.
4.4.4.4 Physical Resource Blocks
Physical resource blocks for subcarrier configuration μ are defined within a bandwidth part and numbered from 0 to NBWP,isize,μ−1 where i is the number of the bandwidth part. The relation between the physical resource block nPRBμ in bandwidth part i and the common resource block nCRBμ is given by
n
CRB
μ
=n
PRB
μ
+N
BWP,i
start,μ
where NBWP,istart,μ is the common resource block where bandwidth part starts relative to common resource block 0. When there is no risk for confusion the index μ may be dropped.
4.4.4.5 Virtual Resource Blocks
Virtual resource blocks are defined within a bandwidth part and numbered from 0 to NBWP,isize−1 where i is the number of the bandwidth part.
4.4.5 Bandwidth Part
A bandwidth part is a subset of contiguous common resource blocks defined in subclause 4.4.4.3 for a given numerology μ in bandwidth part i on a given carrier. The starting position NBWP,istart,μ and the number of resource blocks NBWP,isize,μ in a bandwidth part shall fulfil Ngrid,xstart,μ≤NBWP,istart,μ<Ngrid,xstart,μ+Ngrid,xsize,μ and Ngrid,xstart,μ<NBWP,istart,μ+NBWP,isize,μ≤Ngrid,xstart,μ+Ngrid,xsize,μ, respectively. Configuration of a bandwidth part is described in clause 12 of [5, TS 38.213].
A UE can be configured with up to four bandwidth parts in the downlink with a single downlink bandwidth part being active at a given time. The UE is not expected to receive PDSCH, PDCCH, or CSI-RS (except for RRM) outside an active bandwidth part.
A UE can be configured with up to four bandwidth parts in the uplink with a single uplink bandwidth part being active at a given time. If a UE is configured with a supplementary uplink, the UE can in addition be configured with up to four bandwidth parts in the supplementary uplink with a single supplementary uplink bandwidth part being active at a given time. The UE shall not transmit PUSCH or PUCCH outside an active bandwidth part. For an active cell, the UE shall not transmit SRS outside an active bandwidth part.
Unless otherwise noted, the description in this specification applies to each of the bandwidth parts. When there is no risk of confusion, the index μ may be dropped from NBWP,istart,μ, NBWP,isize,μ, Ngrid,xstart,μ, and Ngrid,xsize,μ.
4.5 Carrier Aggregation
Transmissions in multiple cells can be aggregated. Unless otherwise noted, the description in this specification applies to each of the serving cells.
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Slot format information (SFI) is introduced to indicate transmission direction for a symbol(s), e.g., DL, UL or Flexible. SFI could be indicated or revealed by several signals, such as RRC configuration, DCI for SFI, scheduling DCI. Some handling would be then required if more than one direction is indicated to a symbol. More details regarding SFI is quoted below from [2] 3GPP TS 38.213 V16.6.0, “NR Physical layer procedures for control”:
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11.1 Slot Configuration
A slot format includes downlink symbols, uplink symbols, and flexible symbols.
The following are applicable for each serving cell.
If a UE is provided tdd-UL-DL-ConfigurationCommon, the UE sets the slot format per slot over a number of slots as indicated by tdd-UL-DL-ConfigurationCommon.
The tdd-UL-DL-ConfigurationCommon provides
The pattern1 provides
A value P=0.625 msec is valid only for μref−3. A value P=1.25 msec is valid only for μref−2 or μref=3. A value P=2.5 msec is valid only for μref−1, or μref−2, or μref−3.
A slot configuration period of P msec includes S=P·2μ
The first symbol every 20/P periods is a first symbol in an even frame.
If tdd-UL-DL-ConfigurationCommon provides both pattern1 and pattern2, the UE sets the slot format per slot over a first number of slots as indicated by pattern1 and the UE sets the slot format per slot over a second number of slots as indicated by pattern2.
The pattern2 provides
The applicable values of P2 are same as the applicable values for P.
A slot configuration period of P+P2 msec includes first S=P·2μ
From the S2 slots, a first dslots,2 slots include only downlink symbols and a last uslots,2 include only uplink symbols.
The dsym,2 symbols after the first dslots,2 slots are downlink symbols. The usym,2 symbols before the last uslots,2 slots are uplink symbols. The remaining (S2−dslots,2−uslots,2)·Nsymbslot−dsym,2−usym,2 are flexible symbols.
A UE expects that P+P2 divides 20 msec.
The first symbol every 20/(P+P2) periods is a first symbol in an even frame.
A UE expects that the reference SCS configuration μref is smaller than or equal to a SCS configuration μ for any configured DL BWP or UL BWP. Each slot provided by pattern1 or pattern2 is applicable to 2(μ−μ
The tdd-UL-DL-ConfigurationDedicated provides
For each slot having a corresponding index provided by slotIndex, the UE applies a format provided by a corresponding symbols. The UE does not expect tdd-UL-DL-ConfigurationDedicated to indicate as uplink or as downlink a symbol that tdd-UL-DL-ConfigurationCommon indicates as a downlink or as an uplink symbol, respectively.
For each slot configuration provided by tdd-UL-DL-ConfigurationDedicated, a reference SCS configuration is the reference SCS configuration μref provided by tdd-UL-DL-ConfigurationCommon.
A slot configuration period and a number of downlink symbols, uplink symbols, and flexible symbols in each slot of the slot configuration period are determined from tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated and are common to each configured BWP.
A UE considers symbols in a slot indicated as downlink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated to be available for receptions and considers symbols in a slot indicated as uplink by tdd-UL-DL-ConfigurationCommon, or by tdd-UL-DL-ConfigurationDedicated to be available for transmissions.
If a UE is not configured to monitor PDCCH for DCI format 2_0, for a set of symbols of a slot that are indicated as flexible by tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated if provided, or when tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated are not provided to the UE
For operation on a single carrier in unpaired spectrum, if a UE is configured by higher layers to receive a PDCCH, or a PDSCH, or a CSI-RS, or a DL PRS in a set of symbols of a slot, the UE receives the PDCCH, the PDSCH, the CSI-RS, or the DL PRS if the UE does not detect a DCI format that indicates to the UE to transmit a PUSCH, a PUCCH, a PRACH, or a SRS in at least one symbol of the set of symbols of the slot; otherwise, the UE does not receive the PDCCH, or the PDSCH, or the CSI-RS, or the DL PRS in the set of symbols of the slot.
For operation with shared spectrum channel access, if a UE is provided csi-RS-ValidationWith-DCI, is not provided CO-DurationsPerCell, and is not provided SlotFormatCombinationsPerCell, and if the UE is configured by higher layers to receive a CSI-RS in a set of symbols of a slot, the UE cancels the CSI-RS reception in the set of symbols of the slot if the UE does not detect a DCI format indicating an aperiodic CSI-RS reception or scheduling a PDSCH reception in the set of symbols of the slot.
If a UE is provided channelAccessMode=‘dynamic’ and is provided availableRB-SetsToAddModList and availableRB-SetsToRelease, the UE expects to be provided co-DurationsPerCellToAddModList and co-DurationsPerCellToReleaseList and/or slotFormatCombToAddModList and slotFormatCombToReleaseList.
For operation on a single carrier in unpaired spectrum, if a UE is configured by higher layers to transmit SRS, or PUCCH, or PUSCH, or PRACH in a set of symbols of a slot and the UE detects a DCI format indicating to the UE to receive CSI-RS or PDSCH in a subset of symbols from the set of symbols, then
Tproc,2 is the PUSCH preparation time for the corresponding UE processing capability [6, TS 38.214] assuming d2,1=1 and μ corresponds to the smallest SCS configuration between the SCS configuration of the PDCCH carrying the DCI format and the SCS configuration of the SRS, PUCCH, PUSCH or μr, where μr corresponds to the SCS configuration of the PRACH if it is 15 kHz or higher; otherwise μr=0.
For a set of symbols of a slot that are indicated to a UE as uplink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, the UE does not receive PDCCH, PDSCH, or CSI-RS when the PDCCH, PDSCH, or CSI-RS overlaps, even partially, with the set of symbols of the slot.
For a set of symbols of a slot that are indicated to a UE as uplink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, the UE does not receive DL PRS in the set of symbols of the slot, if the UE is not provided with a measurement gap.
For a set of symbols of a slot that are indicated to a UE as downlink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, the UE does not transmit PUSCH, PUCCH, PRACH, or SRS when the PUSCH, PUCCH, PRACH, or SRS overlaps, even partially, with the set of symbols of the slot.
For a set of symbols of a slot that are indicated to a UE as flexible by tdd-UL-DL-ConfigurationCommon, and tdd-UL-DL-ConfigurationDedicated if provided, the UE does not expect to receive both dedicated higher layer parameters configuring transmission from the UE in the set of symbols of the slot and dedicated higher layer parameters configuring reception by the UE in the set of symbols of the slot.
For operation on a single carrier in unpaired spectrum, for a set of symbols of a slot indicated to a UE by ssb-PositionslnBurst in SIB1 or ssb-PositionslnBurst in ServingCellConfigCommon, for reception of SS/PBCH blocks, the UE does not transmit PUSCH, PUCCH, PRACH in the slot if a transmission would overlap with any symbol from the set of symbols and the UE does not transmit SRS in the set of symbols of the slot. The UE does not expect the set of symbols of the slot to be indicated as uplink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, when provided to the UE.
If a UE
For a set of symbols of a slot corresponding to a valid PRACH occasion and Ngap symbols before the valid PRACH occasion, as described in clause 8.1, the UE does not receive PDCCH, PDSCH, or CSI-RS in the slot if a reception would overlap with any symbol from the set of symbols. The UE does not expect the set of symbols of the slot to be indicated as downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated.
For a set of symbols of a slot indicated to a UE by pdcch-ConfigSIB1 in MIB for a CORESET for Type0-PDCCH CSS set, the UE does not expect the set of symbols to be indicated as uplink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated.
If a UE is scheduled by a DCI format to receive PDSCH over multiple slots, and if tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, indicate that, for a slot from the multiple slots, at least one symbol from a set of symbols where the UE is scheduled PDSCH reception in the slot is an uplink symbol, the UE does not receive the PDSCH in the slot.
If a UE is scheduled by a DCI format to transmit PUSCH over multiple slots, and if tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, indicates that, for a slot from the multiple slots, at least one symbol from a set of symbols where the UE is scheduled PUSCH transmission in the slot is a downlink symbol, the UE does not transmit the PUSCH in the slot.
If a UE
where the symbol is configured as
And if another cell among the cells configured with directionalCollisionHandling-r16 operates in the same frequency band as the reference cell, the UE does not expect
if the reference cell and another cell among the cells configured with directionalCollisionHandling-r16 operate in different frequency bands, the UE
After the UE applies the procedures described above for directional collision handling within the set of cells that have been configured with directionalCollisionHandling-r16, the UE does not expect any directional collision among the serving cells that the UE is not capable of simultaneous transmission and reception.
11.1.1 UE Procedure for Determining Slot Format
This clause applies for a serving cell that is included in a set of serving cells configured to a UE by slotFormatCombToAddModList and slotFormatCombToReleaseList, availableRB-SetsToAddModList and availableRB-SetsToRelease, switchTriggerToAddModList and switchTriggerToReleaseList, or co-DurationsPerCellToAddModList and co-DurationsPerCellToReleaseList.
If a UE is configured by higher layers with parameter SlotFormatIndicator, the UE is provided an SFI-RNT1 by sfi-RNT1 and with a payload size of DCI format 2_0 by dci-PayloadSize.
The UE is also provided in one or more serving cells with a configuration for a search space set s and a corresponding CORESET p for monitoring Mp,s(L
For each serving cell in the set of serving cells, the UE can be provided:
If neither CO-DurationPerCell-r16 nor SlotFormatCombinationsPerCell are provided and if ChannelAccessMode-r16=‘semistatic’ is provided, the procedures in this clause apply with assuming a channel occupancy time defined in clause 4.3 of [15, TS 37.213] is the remaining channel occupancy duration if a DL transmission burst(s) is detected within the channel occupancy time.
A SFI-index field value in a DCI format 2_0 indicates to a UE a slot format for each slot in a number of slots for each DL BWP or each UL BWP starting from a slot where the UE detects the DCI format 2_0. The number of slots is equal to or larger than a PDCCH monitoring periodicity for DCI format 2_0. The SFI-index field includes max{┌log2(maxSFIindex+1┐} bits where maxSFIindex is the maximum value of the values provided by corresponding slotFormatCombinationld. A slot format is identified by a corresponding format index as provided in Table 11.1.1-1 where denotes a downlink symbol, ‘U’ denotes an uplink symbol, and ‘F’ denotes a flexible symbol.
If a PDCCH monitoring periodicity for DCI format 2_0, provided to a UE for the search space set S by monitoringSlotPeriodicityAndOffset, is smaller than a duration of a slot format combination the UE obtains at a PDCCH monitoring occasion for DCI format 2_0 by a corresponding SFI-index field value, and the UE detects more than one DCI formats 2_0 indicating a slot format for a slot, the UE expects each of the more than one DCI formats 2_0 to indicate a same format for the slot.
A UE does not expect to be configured to monitor PDCCH for DCI format 2_0 on a second serving cell that uses larger SCS than the serving cell.
For unpaired spectrum operation for a UE on a serving cell, the UE is provided by subcarrierSpacing a reference SCS configuration μSFI for each slot format in a combination of slot formats indicated by an SFI-index field value in DCI format 2_0. The UE expects that for a reference SCS configuration μSFI and for an active DL BWP or an active UL BWP with SCS configuration μ, it is μ≥μSFI. Each slot format in the combination of slot formats indicated by the SFI-index field value in DCI format 2_0 is applicable to 2(μ−μ
For paired spectrum operation for a UE on a serving cell, the SFI-index field in DCI format 2_0 indicates a combination of slot formats that includes a combination of slot formats for a reference DL BWP and a combination of slot formats for a reference UL BWP of the serving cell. The UE is provided by subcarrierSpacing a reference SCS configuration μSFI,DL for the combination of slot formats indicated by the SFI-index field value in DCI format 2_0 for the reference DL BWP of the serving cell. The UE is provided by subcarrierSpacing2 a reference SCS configuration μSFI,UL for the combination of slot formats indicated by the SFI-index field value in DCI format 2_0 for the reference UL BWP of the serving cell. If μSFI,DL≤μSFI,UL and for each 2(μ
The UE is provided a reference SCS configuration μSFI,DL so that for an active DL BWP with SCS configuration μDL, it is μDL≥μSFI,DL. The UE is provided a reference SCS configuration μSFI,UL so that for an active UL BWP with SCS configuration μUL, it is μUL≥μSFI,UL. Each slot format for a combination of slot formats indicated by the SFI-index field value in DCI format 2_0 for the reference DL BWP, by indicating a value for slotFormatCombinationld that is mapped to a value of slotFormats in slotFormatCombination, is applicable to 2(μ
For unpaired spectrum operation with a second UL carrier for a UE on a serving cell, the SFI-index field value in DCI format 2_0 indicates a combination of slot formats that includes a combination of slot formats for a reference first UL carrier of the serving cell and a combination of slot formats for a reference second UL carrier of the serving cell. The UE is provided by subcarrierSpacing a reference SCS configuration μSFI for the combination of slot formats indicated by the SFI-index field in DCI format 2_0 for the reference first UL carrier of the serving cell. The UE is provided by subcarrierSpacing2 a reference SCS configuration μSFI,SUL for the combination of slot formats indicated by the SFI-index field value in DCI format 2_0 for the reference second UL carrier of the serving cell. For each 2(μ
The UE expects to be provided a reference SCS configuration μSFI,SUL so that for an active UL BWP in the second UL carrier with SCS configuration μSUL, is μSUL≥μSFI,SUL Each slot format for a combination of slot formats indicated by the SFI-index field in DCI format 2_0 for the reference first UL carrier is applicable to 2(μ
If a BWP in the serving cell is configured with μ=2 and with extended CP, the UE expects μSFI=0, μSFI=1, or μSFI=2. A format for a slot with extended CP is determined from a format for a slot with normal CP. A UE determines an extended CP symbol to be a downlink/uplink/flexible symbol if the overlapping normal CP symbols that are downlink/uplink/flexible symbols, respectively. A UE determines an extended CP symbol to be a flexible symbol if one of the overlapping normal CP symbols is flexible. A UE determines an extended CP symbol to be a flexible symbol if the pair of the overlapping normal CP symbols includes a downlink and an uplink symbol.
A reference SCS configuration μSFI, or μSFI,DL, or μSFI,UL, or μSFI,SUL is either 0, or 1, or 2 for FR1 and is either 2 or 3 for FR2.
For a set of symbols of a slot, a UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols of the slot as uplink and to detect a DCI format indicating to the UE to receive PDSCH or CSI-RS in the set of symbols of the slot.
For a set of symbols of a slot, a UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols in the slot as downlink and to detect a DCI format, a RAR UL grant, fallbackRAR UL grant, or successRAR indicating to the UE to transmit PUSCH, PUCCH, PRACH, or SRS in the set of symbols of the slot.
For a set of symbols of a slot that are indicated by a DCI format 2_0 as being within a remaining channel occupancy duration either by a channel occupancy duration field or by an SFI-index field, a UE does not expect to detect at a later time a DCI format 2_0 indicating, either by a channel occupancy duration field or by an SFI-index field, that any symbol from the set of symbols is not within a remaining channel occupancy duration.
For a set of symbols of a slot that are indicated as downlink/uplink by tdd-UL-DL-ConfigurationCommon, or tdd-UL-DL-ConfigurationDedicated, the UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols of the slot as uplink/downlink, respectively, or as flexible.
For a set of symbols of a slot corresponding to SS/PBCH blocks with candidate SS/PBCH block indices corresponding to the SS/PBCH block indexes indicated to a UE by ssb-PositionslnBurst in SIB1, or by ssb-PositionslnBurst in ServingCellConfigCommon, as described in clause 4.1, the UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols of the slot as uplink.
For a set of symbols of a slot corresponding to a valid PRACH occasion and Ngap symbols before the valid PRACH occasion, as described in clause 8.1, the UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols of the slot as downlink.
For a set of symbols of a slot indicated to a UE by pdcch-ConfigSIB1 in MIB for a CORESET for Type0-PDCCH CSS set, the UE does not expect to detect a DCI format 2_0 with an SFI-index field value indicating the set of symbols of the slot as uplink.
For a set of symbols of a slot indicated to a UE as flexible by tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated if provided, or when tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated are not provided to the UE, and if the UE detects a DCI format 2_0 providing a format for the slot using a slot format value other than 255
If a UE is configured by higher layers to receive a CSI-RS or a PDSCH in a set of symbols of a slot and the UE detects a DCI format 2_0 with a slot format value other than 255 that indicates a slot format with a subset of symbols from the set of symbols as uplink or flexible, or the UE detects a DCI format indicating to the UE to transmit PUSCH, PUCCH, SRS, or PRACH in at least one symbol in the set of the symbols, the UE cancels the CSI-RS reception in the set of symbols of the slot or cancels the PDSCH reception in the slot.
For operation with shared spectrum channel access, if a UE is configured by higher layers to receive a CSI-RS and the UE is provided CO-DurationsPerCell, for a set of symbols of a slot that are indicated as downlink or flexible by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated, or when tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated are not provided, the UE cancels the CSI-RS reception in the set of symbols of the slot that are not within the remaining channel occupancy duration.
If a UE is configured by higher layers to receive a DL PRS in a set of symbols of a slot and the UE detects a DCI format 2_0 with a slot format value other than 255 that indicates a slot format with a subset of symbols from the set of symbols as uplink, or the UE detects a DCI format indicating to the UE to transmit PUSCH, PUCCH, SRS, or PRACH in at least one symbol in the set of the symbols, the UE cancels the DL PRS reception in the set of symbols of the slot.
If a UE is configured by higher layers to transmit SRS, or PUCCH, or PUSCH, or PRACH in a set of symbols of a slot and the UE detects a DCI format 2_0 with a slot format value other than 255 that indicates a slot format with a subset of symbols from the set of symbols as downlink or flexible, or the UE detects a DCI format indicating to the UE to receive CSI-RS or PDSCH in a subset of symbols from the set of symbols, then
Tproc,2 is the PUSCH preparation time for the corresponding UE processing capability [6, TS 38.214] assuming d2,1=1 and μ corresponds to the smallest SCS configuration between the SCS configuration of the PDCCH carrying the DCI format and the SCS configuration of the SRS, PUCCH, PUSCH or μr, where μr corresponds to the SCS configuration of the PRACH if it is 15 kHz or higher; otherwise μr=0.
If a UE is configured by higher layers to receive a CSI-RS or detects a DCI format 0_1 indicating to the UE to receive a CSI-RS in one or more RB sets and a set of symbols of a slot, and the UE detects a DCI format 2_0 with bitmap indicating that any RB set from the one or more RB sets is not available for reception, the UE cancels the CSI-RS reception in the set of symbols of the slot.
A UE assumes that flexible symbols in a CORESET configured to the UE for PDCCH monitoring are downlink symbols if the UE does not detect an SFI-index field value in DCI format 2_0 indicating the set of symbols of the slot as flexible or uplink and the UE does not detect a DCI format indicating to the UE to transmit SRS, PUSCH, PUCCH, or PRACH in the set of symbols.
For a set of symbols of a slot that are indicated as flexible by tdd-UL-DL-ConfigurationCommon, and tdd-UL-DL-ConfigurationDedicated if provided, or when tdd-UL-DL-ConfigurationCommon, and tdd-UL-DL-ConfigurationDedicated are not provided to the UE, and if the UE does not detect a DCI format 2_0 providing a slot format for the slot
For unpaired spectrum operation for a UE on a cell in a frequency band of FR1, and when the scheduling restrictions due to RRM measurements [10, TS 38.133] are not applicable, if the UE detects a DCI format indicating to the UE to transmit in a set of symbols, the UE is not required to perform RRM measurements [10, TS 38.133] based on a SS/PBCH block or CSI-RS reception on a different cell in the frequency band if the SS/PBCH block or CSI-RS reception includes at least one symbol from the set of symbols.
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Bandwidth part (BWP) is a new technique to handle a bandwidth and/or a frequency location for reception (e.g., Downlink (DL) bandwidth part) and/or for transmission (e.g., Uplink (UL) bandwidth part), e.g., from the perspective of a User Equipment (UE). The UE is able to adjust its hardware (e.g., Radio Frequency (RF), baseband, FFT, filter, center frequency) so that reception and/or transmission could be done properly with knowledge of BWP. BWP framework provides a good balance between performance, e.g., transmission speed/throughput and power consumption, and also gives a network node a degree of freedom to conduct load balancing. For example, the base station could adjust BWP size (e.g., bandwidth of a bandwidth part) depending on traffic condition of a UE. When there is low/no traffic for a UE, (active) BWP of the UE could be set to a smaller size, e.g., so as to save power consumption. When more traffic is coming/demanding, (active) BWP of the UE could be set to a larger size, e.g., so as to provide higher throughput or transmission speed. A base station could also move a UE from a first portion of a cell bandwidth to a second portion of cell bandwidth, e.g., if the first portion is congested (with too many (active) UE with active BWP within the first portion) and/or the second portion is less congested (with less (active) UE with active BWP within the second portion). There would be a couple of BWPs configured for a UE, and at most one DL BWP/UL BWP is active at a time. There are a couple of ways to change BWP, e.g., by an indication on DCI, by a special event, by a predefined rule, in response to initiation of random access procedure, or in response to expiration of a timer. For Time Division Duplex (TDD), e.g., paired spectrum, since a common center frequency is shared between UL and DL, a DL BWP would be paired with an UL BWP, e.g., DL BWP with one id would be paired with UL BWP with the same id. BWP switches/changes would happen for DL BWP and UL BWP at the same time. For example, when active DL BWP is changed from DL BWP 0 to DL BWP 1, active UL BWP would be changed from UL BWP 0 to UL BWP 1. More details for BWP can be found in the following quotation from [2] 3GPP TS 38.213 V16.6.0, “NR Physical layer procedures for control” and [3] 3GPP TS 38.321 V16.7.0, “NR MAC protocol specification”:
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12 Bandwidth Part Operation
If the UE is configured with a SCG, the UE shall apply the procedures described in this clause for both MCG and SCG
A UE configured for operation in bandwidth parts (BWPs) of a serving cell, is configured by higher layers for the serving cell a set of at most four bandwidth parts (BWPs) for receptions by the UE (DL BWP set) in a DL bandwidth by parameter BWP-Downlink or by parameter initialDownlinkBWP with a set of parameters configured by BWP-DownlinkCommon and BWP-DownlinkDedicated, and a set of at most four BWPs for transmissions by the UE (UL BWP set) in an UL bandwidth by parameter BWP-Uplink or by parameter initialUplinkBWP with a set of parameters configured by BWP-UplinkCommon and BWP-UplinkDedicated.
For operation with shared spectrum channel access, a UE expects that the BWP configured by the parameter initialUplinkBWP provided in UplinkConfigCommonSlB is mapped to only a single RB set.
If a UE is not provided initialDownlinkBWP, an initial DL BWP is defined by a location and number of contiguous PRBs, starting from a PRB with the lowest index and ending at a PRB with the highest index among PRBs of a CORESET for Type0-PDCCH CSS set, and a SCS and a cyclic prefix for PDCCH reception in the CORESET for Type0-PDCCH CSS set; otherwise, the initial DL BWP is provided by initialDownlinkBWP. For operation on the primary cell or on a secondary cell, a UE is provided an initial UL BWP by initialUplinkBWP. If the UE is configured with a supplementary UL carrier, the UE can be provided an initial UL BWP on the supplementary UL carrier by initialUplinkBWP.
If a UE has dedicated BWP configuration, the UE can be provided by firstActiveDownlinkBWP-Id a first active DL BWP for receptions and by firstActiveUplinkBWP-Id a first active UL BWP for transmissions on a carrier of the primary cell.
For each DL BWP or UL BWP in a set of DL BWPs or UL BWPs, respectively, the UE is provided the following parameters for the serving cell as defined in [4, TS 38.211] or [6, TS 38.214]:
For unpaired spectrum operation, a DL BWP from the set of configured DL BWPs with index provided by BWP-Id is linked with an UL BWP from the set of configured UL BWPs with index provided by BWP-Id when the DL BWP index and the UL BWP index are same. For unpaired spectrum operation, a UE does not expect to receive a configuration where the center frequency for a DL BWP is different than the center frequency for an UL BWP when the BWP-Id of the DL BWP is same as the BWP-Id of the UL BWP.
For each DL BWP in a set of DL BWPs of the PCell, a UE can be configured CORESETs for every type of CSS sets and for USS as described in clause 10.1. The UE does not expect to be configured without a CSS set on the PCell in the active DL BWP.
If a UE is provided controlResourceSetZero and searchSpaceZero in PDCCH-ConfigSIB1 or PDCCH-ConfigCommon, the UE determines a CORESET for a search space set from controlResourcesetZero as described in clause 13 and for Tables 13-1 through 13-10, and determines corresponding PDCCH monitoring occasions as described in clause 13 and for Tables 13-11 through 13-15. If the active DL BWP is not the initial DL BWP, the UE determines PDCCH monitoring occasions for the search space set only if the CORESET bandwidth is within the active DL BWP and the active DL BWP has same SCS configuration and same cyclic prefix as the initial DL BWP.
For each UL BWP in a set of UL BWPs of the PCell or of the PUCCH-SCell, the UE is configured resource sets for PUCCH transmissions as described in clause 9.2.1.
A UE receives PDCCH and PDSCH in a DL BWP according to a configured SCS and CP length for the DL BWP. A UE transmits PUCCH and PUSCH in an UL BWP according to a configured SCS and CP length for the UL BWP.
If a bandwidth part indicator field is configured in a DCI format, the bandwidth part indicator field value indicates the active DL BWP, from the configured DL BWP set, for DL receptions as described in [5, TS 38.212]. If a bandwidth part indicator field is configured in a DCI format, the bandwidth part indicator field value indicates the active UL BWP, from the configured UL BWP set, for UL transmissions as described in [5, TS 38.212]. If a bandwidth part indicator field is configured in a DCI format and indicates an UL BWP or a DL BWP different from the active UL BWP or DL BWP, respectively, the UE shall
If a bandwidth part indicator field is configured in a DCI format 0_1 and indicates an active UL BWP with different SCS configuration μ, or with different number NRB-set,ULBWP of RB sets, than a current active UL BWP, the UE determines an uplink frequency domain resource allocation Type 2 based on X′ bits and Y′ bits that are generated by independently truncating or padding the X MSBs and the Y LSBs [6, TS 38.214] of the frequency domain resource assignment field of DCI format 0_1, where truncation starts from the MSBs of the X bits or the Y bits, zero-padding prepends zeros to the X bits or the Y bits, and
where NRB-set,ULBWP is a number of RB sets configured for the indicated active UL BWP
A UE does not expect to detect a DCI format with a BWP indicator field that indicates an active DL BWP or an active UL BWP change with the corresponding time domain resource assignment field providing a slot offset value for a PDSCH reception or PUSCH transmission that is smaller than a delay required by the UE for an active DL BWP change or UL BWP change, respectively [10, TS 38.133].
If a UE detects a DCI format with a BWP indicator field that indicates an active DL BWP change for a cell, the UE is not required to receive or transmit in the cell during a time duration from the end of the third symbol of a slot where the UE receives the PDCCH that includes the DCI format in a scheduling cell until the beginning of a slot indicated by the slot offset value of the time domain resource assignment field in the DCI format.
If a UE detects a DCI format with SCell dormancy indication that indicates an active DL BWP change for an Scell in slot n of primary cell, the UE is not required to receive or transmit in the SCell during a time duration specified in [10, TS 38.133].
If a UE detects a DCI format indicating an active UL BWP change for a cell, the UE is not required to receive or transmit in the cell during a time duration from the end of the third symbol of a slot where the UE receives the PDCCH that includes the DCI format in the scheduling cell until the beginning of a slot indicated by the slot offset value of the time domain resource assignment field in the DCI format.
A UE does not expect to detect a DCI format indicating an active DL BWP change or an active UL BWP change for a scheduled cell within FR1 (or FR2) in a slot other than the first slot of a set of slots for the DL SCS of the scheduling cell that overlaps with a time duration where the UE is not required to receive or transmit, respectively, for an active BWP change in a different cell from the scheduled cell within FR1 (or FR2).
A UE expects to detect a DCI format with a BWP indicator field that indicates an active UL BWP change or an active DL BWP change only if a corresponding PDCCH is received within the first 3 symbols of a slot.
For a serving cell, a UE can be provided by defaultDownlinkBWP-Id a default DL BWP among the configured DL BWPs. If a UE is not provided a default DL BWP by defaultDownlinkBWP-Id, the default DL BWP is the initial DL BWP.
If a UE is provided by bwp-InactivityTimer a timer value for the serving cell [11, TS 38.321] and the timer is running, the UE decrements the timer at the end of a subframe for FR1 or at the end of a half subframe for FR2 if the restarting conditions in [11, TS 38.321] are not met during the interval of the subframe for FR1 or of the half subframe for FR2.
For a cell where a UE changes an active DL BWP due to a BWP inactivity timer expiration and for accommodating a delay in the active DL BWP change or the active UL BWP change required by the UE [10, TS 38.133], the UE is not required to receive or transmit in the cell during a time duration from the beginning of a subframe for FR1, or of half of a subframe for FR2, that is immediately after the BWP inactivity timer expires until the beginning of a slot where the UE can receive or transmit.
When a UE's BWP inactivity timer for a cell within FR1 (or FR2) expires within a time duration where the UE is not required to receive or transmit for an active UL/DL BWP change in the cell or in a different cell within FR1 (or FR2), the UE delays the active UL/DL BWP change triggered by the BWP inactivity timer expiration until a subframe for FR1 or half a subframe for FR2 that is immediately after the UE completes the active UL/DL BWP change in the cell or in the different cell within FR1 (or FR2).
If a UE is provided by firstActiveDownlinkBWP-Id a first active DL BWP and by firstActiveUplinkBWP-Id a first active UL BWP on a carrier of a secondary cell, the UE uses the indicated DL BWP and the indicated UL BWP as the respective first active DL BWP on the secondary cell and first active UL BWP on the carrier of the secondary cell.
A UE does not expect to monitor PDCCH when the UE performs RRM measurements [10, TS 38.133] over a bandwidth that is not within the active DL BWP for the UE.
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5.15 Bandwidth Part (BWP) Operation
5.15.1 Downlink and Uplink
In addition to clause 12 of TS 38.213 [6], this clause specifies requirements on BWP operation.
A Serving Cell may be configured with one or multiple BWPs, and the maximum number of BWP per Serving Cell is specified in TS 38.213 [6].
The BWP switching for a Serving Cell is used to activate an inactive BWP and deactivate an active BWP at a time. The BWP switching is controlled by the PDCCH indicating a downlink assignment or an uplink grant, by the bwp-InactivityTimer, by RRC signalling, or by the MAC entity itself upon initiation of Random Access procedure or upon detection of consistent LBT failure on SpCell. Upon RRC (re-)configuration of firstActiveDownlinkBWP-Id and/or firstActiveUplinkBWP-Id for SpCell or activation of an SCell, the DL BWP and/or UL BWP indicated by firstActiveDownlinkBWP-Id and/or firstActiveUplinkBWP-Id respectively (as specified in TS 38.331 [5]) is active without receiving PDCCH indicating a downlink assignment or an uplink grant. The active BWP for a Serving Cell is indicated by either RRC or PDCCH (as specified in TS 38.213 [6]). For unpaired spectrum, a DL BWP is paired with a UL BWP, and BWP switching is common for both UL and DL.
For each SCell a dormant BWP may be configured with dormantBWP-Id by RRC signalling as described in TS 38.331 [5]. Entering or leaving dormant BWP for SCells is done by BWP switching per SCell or per dormancy SCell group based on instruction from PDCCH (as specified in TS 38.213 [6]). The dormancy SCell group configurations are configured by RRC signalling as described in TS 38.331 [5]. Upon reception of the PDCCH indicating leaving dormant BWP, the DL BWP indicated by firstOutsideActiveTimeBWP-Id or by firstWithinActiveTimeBWP-Id (as specified in TS 38.331 [5] and TS 38.213 [6]) is activated. Upon reception of the PDCCH indicating entering dormant BWP, the DL BWP indicated by dormantBWP-Id (as specified in TS 38.331 [5]) is activated. The dormant BWP configuration for SpCell or PUCCH SCell is not supported.
For each activated Serving Cell configured with a BWP, the MAC entity shall:
Upon initiation of the Random Access procedure on a Serving Cell, after the selection of carrier for performing Random Access procedure as specified in clause 5.1.1, the MAC entity shall for the selected carrier of this Serving Cell:
If the MAC entity receives a PDCCH for BWP switching of a Serving Cell, the MAC entity shall:
If the MAC entity receives a PDCCH for BWP switching for a Serving Cell(s) or a dormancy SCell group(s) while a Random Access procedure associated with that Serving Cell is ongoing in the MAC entity, it is up to UE implementation whether to switch BWP or ignore the PDCCH for BWP switching, except for the PDCCH reception for BWP switching addressed to the C-RNTI for successful Random Access procedure completion (as specified in clauses 5.1.4, 5.1.4a, and 5.1.5) in which case the UE shall perform BWP switching to a BWP indicated by the PDCCH. Upon reception of the PDCCH for BWP switching other than successful contention resolution, if the MAC entity decides to perform BWP switching, the MAC entity shall stop the ongoing Random Access procedure and initiate a Random Access procedure after performing the BWP switching; if the MAC decides to ignore the PDCCH for BWP switching, the MAC entity shall continue with the ongoing Random Access procedure on the Serving Cell.
Upon reception of RRC (re-)configuration for BWP switching for a Serving Cell while a Random Access procedure associated with that Serving Cell is ongoing in the MAC entity, the MAC entity shall stop the ongoing Random Access procedure and initiate a Random Access procedure after performing the BWP switching.
Upon reception of RRC (re-)configuration for BWP switching for a Serving Cell, cancel any triggered LBT failure in this Serving Cell.
The MAC entity shall for each activated Serving Cell configured with bwp-InactivityTimer:
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Duplexing enhancement has been discussed in 3GPP to enable more frequent UL so as to improve latency and UL coverage. UL transmission and DL transmission could occur on a same symbol for unpaired spectrum (e.g., TDD). More detail regarding duplexing could be found in the below quotation from [3] 3GPP TS 38.321 V16.7.0, “NR MAC protocol specification”:
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3 Justification
TDD is widely used in commercial NR deployments. In TDD, the time domain resource is split between downlink and uplink Allocation of a limited time duration for the uplink in TDD would result in reduced coverage and increased latency. As a possible enhancement on this limitation of the conventional TDD operation, it would be worth studying the feasibility of allowing the simultaneous existence of downlink and uplink, a k a full duplex, or more specifically, subband non-overlapping full duplex at the gNB side within a conventional TDD band.
The NR TDD allows the dynamic/flexible allocation of downlink and uplink in time and CLI handling and RIM for NR were introduced in Rel-16. Nevertheless, further study may be required for CLI handling between the networks of different operators to enable the dynamic/flexible TDD in commercial networks. The inter-operator CLI may be due to either adjacent-channel CLI or co-channel-CLI, or both, depending on the deployment scenario. The main problem not addressed in the previous releases is gNB-to-gNB CLI.
This study aims to identify the feasibility and solutions of duplex evolution in the areas outlined above to provide enhanced coverage, reduced latency, improved system capacity, and improved configuration flexibility for NR TDD operations in unpaired spectrum.
4 Objective
4.1 Objective of SI
The objective of this study is to identify and evaluate the potential enhancements to support duplex evolution for NR TDD in unpaired spectrum.
In this study, the followings are assumed:
The detailed objectives are as follows:
Note: For potential enhancements on dynamic/flexible TDD, utilize the outcome of discussion in Rel-15 and Rel-16 while avoiding the repetition of the same discussion.
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Issues and Solutions:
Enhancement on duplexing schemes could have impact on how a User Equipment (UE) handles Downlink (DL) reception or Uplink (UL) transmission. For example, on a conventional DL symbol (e.g., without duplexing enhancement), a UE would not perform UL transmission on such symbol, e.g., cancel a configured UL transmission on the symbol or does not expect a Downlink Control Information (DCI) schedule UL transmission on the symbol (network (NW) shall not perform such scheduling and/or UE consider such scheduling as an error case) Similar restriction on DL reception could be applied for a conventional UL symbol. The indicated transmission direction applies to all/whole frequency resources of a bandwidth part/serving cell. However, when one symbol could support more than one transmission direction, e.g., for both DL and UL, under duplexing enhancements such restriction may not hold any longer. For example, a UE may be able to perform UL transmission on a symbol indicated as DL. Whether duplexing enhancement is applicable may be subject to isolation between DL transmission and UL reception at the base station side. For example, isolation could come from separation in frequency domain. UL and DL could use a same symbol while using different (e.g., non-overlapping) frequency resources. With the location of frequency resource for UL and DL becoming different, the operation for UL/DL Bandwidth Part (BWP) may require some further adjustments. More specifically, the gNB may want to adjust frequency location of UL BWP, while frequency location of the DL BWP could be kept the same. However, given UL BWP and DL BWP are linked together, change of DL BWP would result in change of UL BWP, which is undesired and has impact on duplexing enhancement.
A first concept of the present invention is to disable link between UL BWP and DL BWP for unpaired spectrum. (Active) UL BWP change and (active) DL BWP change are performed independently/separately for unpaired spectrum. Disabling the link is due to duplexing enhancement. The link is not disabled when duplexing enhancement is not applied (e.g., by a base station). The base station would indicate whether link between UL BWP and DL BWP is disabled (e.g., due to apply duplexing enhancement). The UE would perform UL BWP change and DL BWP change independently and/or separately when the base station indicates the link is disabled. The UE would perform UL BWP change and DL BWP change jointly when the base station indicates the link is enabled or not disabled. Active UL BWP of the UE and Active DL BWP of the UE does not have a same center frequency.
A second concept of the present invention is to introduce a smaller unit than BWP, e.g., sub-BWP. Sub-BWP could be used to indicate frequency resource(s) and/or transmission direction for duplexing enhancement. UL sub-BWP could be a part/subset of frequency resource within UL BWP. DL sub-BWP could be a part/subset of frequency resource within DL BWP. (Active) UL sub-BWP indicates frequency resource(s) that could be used for UL (transmission/reception). (Active) DL sub-BWP indicates frequency resource(s) that could be used for DL (reception/transmission). UL sub-BWP is not linked with DL sub-BWP. (Active) UL sub-BWP switch and (active) DL sub-BWP switch are performed separately/independently. A UE can be configured with one or more DL sub-BWPs within a DL BWP. A UE can be configured with one or more UL sub-BWPs within an UL BWP. There may be one active DL sub-BWP and/or one active UL sub-BWP at a time. There may be more than one active DL sub-BWP and/or more than one active UL sub-BWP at a time. The UE performs UL transmission and/or DL reception based on (active) UL sub-BWP and/or active DL sub-BWP.
A third concept of the present invention is to introduce a BWP group(s). One (or each) BWP group could comprise one or more BWPs. (Active) UL BWP switch/change within one BWP group would not result in (active) DL BWP switch/change. (Active) UL BWP switch/change across two BWP groups would result in (active) DL BWP switch/change. (Active) DL BWP switch/change within one BWP group would not result in (active) UL BWP switch/change. (Active) DL BWP switch/change across two BWP groups would result in (active) UL BWP switch/change. For example, DL BWP 0, DL BWP 1 are associated with DL BWP group 0, DL BWP 2, DL BWP 3 are associated with DL BWP group 1, UL BWP 0, UL BWP 1 are associated with UL BWP group 0, UL BWP 2, UL BWP 3 are associated with UL BWP group 1. Assume active DL BWP is DL BWP 0 and active UL BWP is UL BWP 0. If/when active DL BWP changes from DL BWP 0 to DL BWP 1, active UL BWP could be kept as UL BWP 0 (e.g., as DL BWP 0 and DL BWP 1 belong to a same BWP group). If/when active DL BWP changes from DL BWP 0 to DL BWP 2, active UL BWP is changed from UL BWP 0 to UL BWP 2 accordingly (e.g., as DL BWP 0 and DL BWP 2 belong to two different BWP groups).
In one embodiment, a UE is configured with at least a first DL BWP and a second DL BWP. The UE is configured with at least a first UL BWP and a second UL BWP. The first DL BWP has the same id as the first UL BWP. The second DL BWP has the same id as the second UL BWP. The UE operates in unpaired spectrum. The UE is indicated that UL BWP change and DL BWP change are performed separately and independently. The UE is indicated that UL BWP is not linked with DL BWP. The UE is indicated that UL BWP with one id is not linked with DL BWP with the one id. The UE performs UL BWP and DL BWP change independently and/or separately, e.g., based on the indication. Active DL BWP of the UE is DL BWP 0. Active UL BWP of the UE is UL BWP 0. The UE changes/switches its active DL BWP from DL BWP 0 to DL BWP 1. The UE does not change/switch its active UL BWP from UL BWP 0 to UL BWP 1. The UE does not change/switch its active UL BWP from UL BWP 0 to UL BWP 1 (even) if the UE changes/switches its active DL BWP from DL BWP 0 to DL BWP 1. The UE does not change/switch its active UL BWP from UL BWP 0 to UL BWP 1 in response to changes/switches of its active DL BWP from DL BWP 0 to DL BWP 1. The UE keeps its active UL BWP as UL BWP 0. UL BWP 0 and DL BWP does not have the same center frequency. The UE keeps its active UL BWP as UL BWP 0 (even) if the UE changes/switches its active DL BWP from DL BWP 0 to DL BWP 1. The UE keeps its active UL BWP as UL BWP 0 in response to changes/switches of its active DL BWP from DL BWP 0 to DL BWP 1. The UE performs UL BWP change and DL BWP change jointly if the UE is not indicated that UL BWP change and DL BWP change are performed separately and independently. The UE links UL BWP with DL BWP if the UE is not indicated that UL BWP is not linked with DL BWP. The UE links UL BWP with one id with DL BWP with the one id if the UE is not indicated that UL BWP with one id is not linked with DL BWP with the one id. The UE performs UL BWP and DL BWP change jointly, e.g., based on absence of the indication. Active DL BWP of the UE is DL BWP 0. Active UL BWP of the UE is UL BWP 0. The UE changes/switches its active DL BWP from DL BWP 0 to DL BWP 1. The UE changes/switches its active UL BWP from UL BWP 0 to UL BWP 1 if the UE is not indicated that UL BWP change and DL BWP change are performed separately and independently. The UE changes/switches its active UL BWP from UL BWP 0 to UL BWP 1 if the UE changes/switches its active DL BWP from DL BWP 0 to DL BWP 1 and/or if the UE is not indicated that UL BWP change and DL BWP change are performed separately and independently. The UE changes/switches its active UL BWP from UL BWP 0 to UL BWP 1 in response to changes/switches of its active DL BWP from DL BWP 0 to DL BWP 1 and/or if the UE is not indicated that UL BWP change and DL BWP change are performed separately and independently.
In another embodiment, a base station configures a UE with at least a first DL BWP and a second DL BWP. The base station configures the UE at least a first UL BWP and a second UL BWP. The first DL BWP has the same id as the first UL BWP. The second DL BWP has the same id as the second UL BWP. The base station operates in unpaired spectrum. The base station indicates the UE that UL BWP change and DL BWP change are performed separately and independently. The base station indicates the UE that UL BWP is not linked with DL BWP. The base station indicates the UE that UL BWP with one id is not linked with DL BWP with the one id. The base station performs UL BWP and DL BWP change for the UE independently and/or separately, e.g., based on the indication. Active DL BWP for the UE is DL BWP 0. Active UL BWP for the UE is UL BWP 0. The base station changes/switches its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station does not change/switch its active UL BWP for the UE from UL BWP 0 to UL BWP 1. The base station does not change/switch its active UL BWP for the UE from UL BWP 0 to UL BWP 1 (even) if the base station changes/switches its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station does not change/switch its active UL BWP for the UE from UL BWP 0 to UL BWP 1 in response to changes/switches of its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station keeps its active UL BWP for the UE as UL BWP 0. The base station keeps its active UL BWP for the UE as UL BWP 0 (even) if the base station changes/switches its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station keeps its active UL BWP for the UE as UL BWP 0 in response to changes/switches of its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station performs UL BWP change for the UE and DL BWP change for the UE jointly if the base station does not indicate the UE that UL BWP change and DL BWP change are performed separately and/or independently. The base station links UL BWP for the UE with DL BWP for the UE if the base station does not indicate the UE that UL BWP change and DL BWP change are performed separately and/or independently. The UE links UL BWP for the UE with one id with DL BWP for the UE with the one id if the base station does not indicate the UE that UL BWP with one id is not linked with DL BWP with the one id. The base station performs UL BWP change for the UE and DL BWP change for the UE jointly, e.g., based on absence of the indication. Active DL BWP for the UE is DL BWP 0. Active UL BWP for the UE is UL BWP 0. The base station changes/switches its active DL BWP for the UE from DL BWP 0 to DL BWP 1. The base station changes/switches its active UL BWP for the UE from UL BWP 0 to UL BWP 1 if the base station does not indicate the UE that UL BWP change for the UE and DL BWP change for the UE are performed separately and independently. The base station changes/switches its active UL BWP for the UE from UL BWP 0 to UL BWP 1 if the base station changes/switches its active DL BWP for the UE from DL BWP 0 to DL BWP 1 and/or if the base station does not indicate the UE that UL BWP change for UE and DL BWP change for UE are performed separately and independently. The base station changes/switches its active UL BWP for the UE from UL BWP 0 to UL BWP 1 in response to changes/switches of its active DL BWP for the UE from DL BWP 0 to DL BWP 1 and/or if the base station does not indicate the UE that UL BWP change and DL BWP change are performed separately and independently.
In another embodiment, a UE is configured with at least one DL BWP and at least one UL BWP. One DL BWP is associated with one or more DL sub-BWPs. One UL BWP is associated with one or more UL sub-BWPs. A DL sub-BWP is/comprises one or more PRBs. A DL sub-BWP is with a frequency resource of its associated DL BWP. A DL sub-BWP occupies a subset of frequency resource of its associated DL BWP. A first DL BWP is active DL BWP of the UE. One or more DL sub-BWPs associated with the first DL BWP could be active DL sub-BWP(s) of the UE. A first DL sub-BWP is associated with the first DL BWP. A second DL sub-BWP is associated with the first DL BWP. Both the first DL sub-BWP and the second DL sub-BWP are active DL sub-BWPs. Either the first DL sub-BWP or the second DL sub-BWP is active DL sub-BWP. DL sub-BWP(s) indicates frequency resource(s) available for DL. Active DL sub-BWP(s) indicates frequency resource(s) available for DL (reception) and/or used for DL (reception). Frequency resource(s) indicated by active DL sub-BWP(s) are not available for UL (transmission) and/or not used for UL (transmission). The UE determines whether to perform/cancel a DL reception and/or UL transmission based on (frequency resources of) its active DL sub-BWP(s). For example, determination could be at least based on frequency resource of active DL sub-BWP(s) and/or frequency resource of DL reception (or frequency resource of UL transmission). A UE performs a DL reception if/when frequency resource of the DL reception is within frequency resources of (active) DL sub-BWP(s). A UE does not perform (or cancel) a DL reception if/when frequency resource of the DL reception is not within frequency resources of (active) DL sub-BWP(s). A UE does not perform (or cancel) a DL reception if/when (at least part of) frequency resource of the DL reception is outside frequency resources of (active) DL sub-BWP(s). A UE does not perform (or cancel) an UL transmission if/when frequency resource of the UL transmission is within frequency resources of (active) DL sub-BWP(s). A UE performs an UL transmission if/when frequency resource of the UL transmission is not within frequency resources of (active) DL sub-BWP(s). A UE performs an UL transmission if/when (at least part of) frequency resource of the UL transmission is outside frequency resources of (active) DL sub-BWP(s). An UL sub-BWP is/comprises one or more PRBs. An UL sub-BWP is with a frequency resource of its associated UL BWP. An UL sub-BWP occupies a subset of frequency resource of its associated UL BWP. A first UL BWP is active UL BWP of the UE. One or more UL sub-BWPs associated with the first UL BWP could be active UL sub-BWP(s) of the UE. A first UL sub-BWP is associated with the first UL BWP. A second UL sub-BWP is associated with the first UL BWP. Both the first UL sub-BWP and the second UL sub-BWP are active UL sub-BWPs. Either the first UL sub-BWP or the second UL sub-BWP is active UL sub-BWP. UL sub-BWP(s) indicates frequency resource(s) available for UL. Active UL sub-BWP(s) indicates frequency resource(s) available for UL (transmission) and/or used for UL (transmission). Frequency resource(s) indicated by active UL sub-BWP(s) are not available for DL (reception) and/or not used for DL (reception). The UE determines whether to perform/cancel a DL reception and/or UL transmission based on (frequency resources of) its active UL sub-BWP(s). For example, determination could be at least based on frequency resource of active UL sub-BWP(s) and/or frequency resource of DL reception (or frequency resource of UL transmission). A UE performs an UL transmission if/when frequency resource of the UL transmission is within frequency resources of (active) UL sub-BWP(s). A UE does not perform (or cancel) an UL transmission if/when frequency resource of the UL transmission is not within frequency resources of (active) UL sub-BWP(s). A UE does not perform (or cancel) an UL transmission if/when (at least part of) frequency resource of the UL transmission is outside frequency resources of (active) UL sub-BWP(s). A UE does not perform (or cancel) a DL reception if/when frequency resource of the DL reception is within frequency resources of (active) UL sub-BWP(s). A UE performs a DL reception if/when frequency resource of the DL reception is not within frequency resources of (active) UL sub-BWP(s). A UE performs a DL reception if/when (at least part of) frequency resource of the DL reception is outside frequency resources of (active) UL sub-BWP(s).
In another embodiment, a base station configures a UE with at least one DL BWP and at least one UL BWP. One DL BWP is associated with one or more DL sub-BWPs. One UL BWP is associated with one or more UL sub-BWPs. A DL sub-BWP is/comprises one or more PRBs. A DL sub-BWP is with a frequency resource of its associated DL BWP. A DL sub-BWP occupies a subset of frequency resources of its associated DL BWP. A first DL BWP is active DL BWP for the UE. One or more DL sub-BWPs associated with the first DL BWP could be active DL sub-BWP(s) for the UE. A first DL sub-BWP is associated with the first DL BWP. A second DL sub-BWP is associated with the first DL BWP. Both the first DL sub-BWP and the second DL sub-BWP are active DL sub-BWPs. Either the first DL sub-BWP or the second DL sub-BWP is active DL sub-BWP. DL sub-BWP(s) indicates frequency resource(s) available for DL. Active DL sub-BWP(s) indicates frequency resource(s) available for DL (transmission) and/or used for DL (transmission). Frequency resource(s) indicated by active DL sub-BWP(s) are not available for UL (reception) and/or not used for UL (reception). The base station determines whether to perform/cancel a DL transmission for the UE and/or UL reception for the UE based on (frequency resources of) active DL sub-BWP(s) for the UE. For example, determination could be at least based on frequency resource of (active) DL sub-BWP(s) for the UE and/or frequency resource of DL transmission (or frequency resource of UL reception). A base station performs a DL transmission if/when frequency resource of the DL transmission is within frequency resources of (active) DL sub-BWP(s). A base station does not perform (or cancel) a DL transmission if/when frequency resource of the DL transmission is not within frequency resources of (active) DL sub-BWP(s). A base station does not perform (or cancel) a DL transmission if/when (at least part of) frequency resource of the DL transmission is outside frequency resources of (active) DL sub-BWP(s). A base station does not perform (or cancel) an UL reception if/when frequency resource of the UL reception is within frequency resources of (active) DL sub-BWP(s). A base station performs an UL reception if/when frequency resource of the UL reception is not within frequency resources of (active) DL sub-BWP(s). A base station performs an UL reception if/when (at least part of) frequency resource of the UL reception is outside frequency resources of (active) DL sub-BWP(s). An UL sub-BWP is/comprises one or more PRBs. An UL sub-BWP is with a frequency resource of its associated UL BWP. An UL sub-BWP occupies a subset of frequency resource of its associated UL BWP. A first UL BWP is active UL BWP of the UE. One or more UL sub-BWPs associated with the first UL BWP could be active UL sub-BWP(s) of the UE. A first UL sub-BWP is associated with the first UL BWP. A second UL sub-BWP is associated with the first UL BWP. Both the first UL sub-BWP and the second UL sub-BWP are active UL sub-BWPs. Either the first UL sub-BWP or the second UL sub-BWP is active UL sub-BWP. UL sub-BWP(s) indicates frequency resource(s) available for UL. Active UL sub-BWP(s) indicates frequency resource(s) available for UL (reception) and/or used for UL (reception). Frequency resource(s) indicated by active UL sub-BWP(s) are not available for DL (transmission) and/or not used for DL (transmission). The base station determines whether to perform/cancel a DL transmission for the UE and/or UL reception for the UE based on (frequency resources of) active UL sub-BWP(s) for the UE. For example, determination could be at least based on frequency resource of active UL sub-BWP(s) and/or frequency resource of DL transmission (or frequency resource of UL reception). A base station performs an UL reception if/when frequency resource of the UL reception is within frequency resources of (active) UL sub-BWP(s). A base station does not perform (or cancel) an UL reception if/when frequency resource of the UL reception is not within frequency resources of (active) UL sub-BWP(s). A base station does not perform (or cancel) an UL reception if/when (at least part of) frequency resource of the UL reception is outside frequency resources of (active) UL sub-BWP(s). A base station does not perform (or cancel) a DL transmission if/when frequency resource of the DL transmission is within frequency resources of (active) UL sub-BWP(s). A base station performs a DL transmission if/when frequency resource of the DL transmission is not within frequency resources of (active) UL sub-BWP(s). A base station performs a DL transmission if/when (at least part of) frequency resource of the DL transmission is outside frequency resources of (active) UL sub-BWP(s).
Throughout various embodiments, the present invention describes behavior or operation of a single serving cell unless otherwise noted.
Throughout various embodiments, the present invention describes behavior or operation of multiple serving cells unless otherwise noted.
Throughout various embodiments, the present invention describes behavior or operation of a single bandwidth part unless otherwise noted.
Throughout various embodiments of the present invention, a base station configures multiple bandwidth parts to the UE unless otherwise noted.
Throughout various embodiments of the present invention, a base station configures a single bandwidth part to the UE unless otherwise noted.
Referring to
Referring back to
Referring to
Referring back to
For the embodiments, examples, and concepts detailed above and herein, the following aspects and embodiments are possible.
In various embodiments, active UL BWP is kept as UL BWP 0.
In various embodiments, UL BWP change and DL BWP change are performed separately and/or independently.
In various embodiments, an indication is transmitted from the base station to the UE to indicate UL BWP change and DL BWP change are performed separately and/or independently.
In various embodiments, UL BWP is not linked with DL BWP.
In various embodiments, UL BWP change is not performed (even) if/when Dl BWP is changed.
In various embodiments, UL BWP is kept the same (even) if/when Dl BWP is changed.
In various embodiments, active UL BWP for the UE and active Dl BWP for the UE have different center frequencies.
In various embodiments, the second DL BWP and the first UL BWP have different center frequencies.
Referring to
For the embodiments, examples, and concepts detailed above and herein, the following aspects and embodiments are possible.
In various embodiments, the UE does not expect center frequency of the active DL BWP and center frequency of the active UL BWP to be different if the UE is not indicated that different center frequencies for active UL BWP and active DL BWP is allowed.
In various embodiments, the active DL BWP and the active UL BWP have different BWP ids if the UE is indicated that active UL BWP and active DL BWP could have different center frequencies.
In various embodiments, the UE is indicated that different center frequencies for active UL BWP and active DL BWP are allowed if duplexing enhancement or subband non-overlap full duplex is enabled.
In various embodiments, the UE is not indicated that different center frequencies for active UL BWP and active DL BWP are allowed if duplexing enhancement or subband non-overlap full duplex is not enabled.
Referring back to
Referring to
For the embodiments, examples, and concepts detailed above and herein, the following aspects and embodiments are possible.
In various embodiments, the UE performs a DL reception if frequency resource of the DL reception is within the one or more DL RB sets and/or the UE cancels a DL reception if frequency resource of the DL reception is not within the one or more DL RB sets.
In various embodiments, the UE cancels the UL transmission on the symbol if the frequency resource of the UL transmission is within the one or more DL RB sets.
In various embodiments, the one or more UL RB sets and the one or more DL RB sets are indicated by one list of guard band.
In various embodiments, the one or more UL RB sets and the one or more DL RB sets are indicated by one list of guard band if duplexing enhancement or subband non-overlap full duplex is enabled.
In various embodiments, the symbol is a DL, flexible, or UL symbol.
In various embodiments, duplexing enhancement or subband non-overlap full duplex is enabled for the symbol.
In various embodiments, the one or more DL RB sets do not overlap with the one or more UL RB sets.
In various embodiments, the one or more DL RB sets indicate frequency resource(s) used for DL and/or the one or more UL RB sets indicate frequency resource(s) used for UL.
In various embodiments, the UL transmission is scheduled by a DCI or configured by higher layer.
Referring back to
Referring to
For the embodiments, examples, and concepts detailed above and herein, the following aspects and embodiments are possible.
In various embodiments, the UE does not expect center frequency of the active DL BWP and center frequency of the active UL BWP to be different if the UE is not indicated that different center frequencies for active UL BWP and active DL BWP are allowed.
In various embodiments, the active DL BWP and the active UL BWP have different BWP ids if the UE is indicated that active UL BWP and active DL BWP could have different center frequencies.
In various embodiments, the UE is indicated that different center frequencies for active UL BWP and active DL BWP are allowed if duplexing enhancement or subband non-overlap full duplex is enabled.
In various embodiments, the UE is not indicated that different center frequencies for active UL BWP and active DL BWP are allowed if duplexing enhancement or subband non-overlap full duplex is not enabled.
Referring back to
Referring to
For the embodiments, examples, and concepts detailed above and herein, the following aspects and embodiments are possible.
In various embodiments, the method further comprises performing a DL reception if the frequency resource of the DL reception is within the one or more DL RB sets, and/or canceling a DL reception if the frequency resource of the DL reception is not within the one or more DL RB sets.
In various embodiments, the method further comprises canceling the UL transmission on the symbol if the frequency resource of the UL transmission is within the one or more DL RB sets.
In various embodiments, the one or more UL RB sets and the one or more DL RB sets are indicated by one list of guard band.
In various embodiments, the one or more UL RB sets and the one or more DL RB sets are indicated by one list of guard band if duplexing enhancement or subband non-overlap full duplex is enabled.
In various embodiments, the symbol is a DL, a flexible, or an UL symbol.
In various embodiments, the duplexing enhancement or subband non-overlap full duplex is enabled for the symbol.
In various embodiments, the one or more DL RB sets do not overlap with the one or more UL RB sets.
In various embodiments, the one or more DL RB sets indicates one or more frequency resources used for DL and/or the one or more UL RB sets indicate one or more frequency resources used for UL.
In various embodiments, the UL transmission is scheduled by a Downlink Control Information (DCI) or configured by higher layer.
Referring back to
Any combination of the above concepts or teachings can be jointly combined or formed to a new embodiment. The disclosed details and embodiments can be used to solve at least (but not limited to) the issues mentioned above and herein.
It is noted that any of the methods, alternatives, steps, examples, and embodiments proposed herein may be applied independently, individually, and/or with multiple methods, alternatives, steps, examples, and embodiments combined together.
Various aspects of the disclosure have been described above. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative. Based on the teachings herein one skilled in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. As an example of some of the above concepts, in some aspects, concurrent channels may be established based on pulse repetition frequencies. In some aspects, concurrent channels may be established based on pulse position or offsets. In some aspects, concurrent channels may be established based on time hopping sequences. In some aspects, concurrent channels may be established based on pulse repetition frequencies, pulse positions or offsets, and time hopping sequences.
Those of ordinary skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of ordinary skill in the art would further appreciate that the various illustrative logical blocks, modules, processors, means, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two, which may be designed using source coding or some other technique), various forms of program or design code incorporating instructions (which may be referred to herein, for convenience, as “software” or a “software module”), or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
In addition, the various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within or performed by an integrated circuit (“IC”), an access terminal, or an access point. The IC may comprise a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute codes or instructions that reside within the IC, outside of the IC, or both. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
It is understood that any specific order or hierarchy of steps in any disclosed process is an example of a sample approach. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
The steps of a method or algorithm described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module (e.g., including executable instructions and related data) and other data may reside in a data memory such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of computer-readable storage medium known in the art. A sample storage medium may be coupled to a machine such as, for example, a computer/processor (which may be referred to herein, for convenience, as a “processor”) such the processor can read information (e.g., code) from and write information to the storage medium. A sample storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in user equipment. In the alternative, the processor and the storage medium may reside as discrete components in user equipment. Moreover, in some aspects, any suitable computer-program product may comprise a computer-readable medium comprising codes relating to one or more of the aspects of the disclosure. In some aspects, a computer program product may comprise packaging materials.
While the invention has been described in connection with various aspects and examples, it will be understood that the invention is capable of further modifications. This application is intended to cover any variations, uses or adaptation of the invention following, in general, the principles of the invention, and including such departures from the present disclosure as come within the known and customary practice within the art to which the invention pertains.
The present Application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 63/341,473, filed May 13, 2022, which is fully incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63341473 | May 2022 | US |
