CN117998611A - Method and apparatus for side link resource selection or exclusion for multiple continuous time transmissions - Google Patents
Method and apparatus for side link resource selection or exclusion for multiple continuous time transmissions Download PDFInfo
- Publication number
- CN117998611A CN117998611A CN202311459789.2A CN202311459789A CN117998611A CN 117998611 A CN117998611 A CN 117998611A CN 202311459789 A CN202311459789 A CN 202311459789A CN 117998611 A CN117998611 A CN 117998611A
- Authority
- CN
- China
- Prior art keywords
- resources
- candidate
- side link
- resource
- slot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 449
- 238000000034 method Methods 0.000 title claims abstract description 204
- 230000007717 exclusion Effects 0.000 title abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 53
- 230000001960 triggered effect Effects 0.000 claims description 20
- 238000004891 communication Methods 0.000 abstract description 56
- 230000008569 process Effects 0.000 description 38
- 238000013468 resource allocation Methods 0.000 description 30
- 238000005259 measurement Methods 0.000 description 15
- 230000011664 signaling Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 230000036961 partial effect Effects 0.000 description 13
- 238000013461 design Methods 0.000 description 11
- 238000012546 transfer Methods 0.000 description 9
- 101150069124 RAN1 gene Proteins 0.000 description 8
- 101100355633 Salmo salar ran gene Proteins 0.000 description 8
- 238000013507 mapping Methods 0.000 description 7
- 230000002441 reversible effect Effects 0.000 description 7
- 208000037918 transfusion-transmitted disease Diseases 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000008450 motivation Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010187 selection method Methods 0.000 description 4
- 101000741965 Homo sapiens Inactive tyrosine-protein kinase PRAG1 Proteins 0.000 description 3
- 102100038659 Inactive tyrosine-protein kinase PRAG1 Human genes 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 230000001143 conditioned effect Effects 0.000 description 3
- 239000013256 coordination polymer Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012913 prioritisation Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- DWDGSKGGUZPXMQ-UHFFFAOYSA-N OPPO Chemical compound OPPO DWDGSKGGUZPXMQ-UHFFFAOYSA-N 0.000 description 2
- 101150014328 RAN2 gene Proteins 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 101100411667 Arabidopsis thaliana RAN4 gene Proteins 0.000 description 1
- 101100172132 Mus musculus Eif3a gene Proteins 0.000 description 1
- 208000008469 Peptic Ulcer Diseases 0.000 description 1
- 101150084062 RAN gene Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Methods and apparatus for providing side link resource selection or exclusion for multi-contiguous time transmissions in a wireless communication system to enhance and/or modify conventional side link mode 2 operation for multi-contiguous time slot transmissions. The method of the first apparatus may include triggering or requesting a selection or reselection based on the sensed resources for performing one or more physical side link shared channel transmissions or physical side link control channel transmissions in a side link resource pool in an unlicensed or shared spectrum, determining a first parameter for determining or initializing candidate multislot resources, receiving side link control information for reserving one or more side link resources, selecting a number of side link resources from among valid/identified/remaining candidate multislot resources after the excluding, and performing the one or more physical side link shared channel transmissions or physical side link control channel transmissions on at least one of the selected number of side link resources.
Description
Technical Field
The present disclosure relates generally to wireless communication networks and, more particularly, to methods and apparatus for side link resource selection or exclusion for multiple continuous time transmissions in a wireless communication system. The multiple contiguous time transmissions include multiple contiguous time interval (TTI) transmissions, multiple contiguous subframe transmissions, multiple contiguous time slot transmissions, multiple contiguous sub-slot transmissions, or multiple contiguous symbol transmissions.
Background
With the rapid increase in demand for large amounts of data to and from mobile communication devices, conventional mobile voice communication networks evolve into networks that communicate using internet protocol (Internet Protocol, IP) data packets. This IP packet communication may provide voice over IP, multimedia, multicast, and on-demand communication services to users of mobile communication devices.
An exemplary network structure is an evolved universal terrestrial radio access network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN). The E-UTRAN system may provide high data throughput for implementing the above-described IP-bearing voice and multimedia services. Currently, the 3GPP standards organization is discussing new next generation (e.g., 5G) radio technologies. Thus, changes to the current body of the 3GPP standard are currently being submitted and considered to evolve and complete the 3GPP standard.
Disclosure of Invention
Methods, systems, and devices are provided for side link resource selection or exclusion for multiple contiguous time slot transmissions (multi-consecutive slot transmission, MCSt) in a wireless communication system to enhance and/or modify conventional side link mode 2 operation for MCSt.
In various embodiments, a method of a first apparatus may include triggering or requesting a selection or reselection based on sensed resources for performing one or more physical side link shared channel (PSSCH) transmissions or physical side link control channel (PSCCH) transmissions in a side chain resource pool in an unlicensed or shared spectrum, determining a first parameter for determining or initializing candidate multislot resources, receiving side chain control information (SCI) for reserving one or more side link resources, selecting a number of side link resources from among valid/identified/remaining candidate multislot resources after exclusion, and performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources.
In various embodiments, a method of a first apparatus includes triggering or requesting a selection or reselection based on sensed resources for performing one or more PSSCH transmissions or PSCCH transmissions in a side chain resource pool in an unlicensed or shared spectrum, determining whether to identify candidate resources including subchannels in more than one set of Resource Blocks (RBs) based on whether a first number of subchannels at least for side link data transmissions is greater than a threshold, selecting a number of side link resources from the identified candidate resource sets, and performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources.
Drawings
Fig. 1 shows a diagram of a wireless communication system according to an embodiment of the present invention.
Fig. 2 is a block diagram of a transmitter system (also referred to as an access network) and a receiver system (also referred to as a user equipment or UE) according to an embodiment of the present invention.
Fig. 3 is a functional block diagram of a communication system according to an embodiment of the present invention.
Fig. 4 is a functional block diagram of the program code of fig. 3 according to an embodiment of the present invention.
Fig. 5 is an example diagram illustrating that when a sensing-based resource selection is triggered/requested in slot n, the (physical layer of the) UE will have a (initial) candidate set of single-slot resources comprising a plurality of candidate single-slot resources, according to an embodiment of the present invention.
Fig. 6 is an example table showing that a block may mean that side link resources are not reserved/scheduled/allocated by other UEs or excluded in the excluding step/operation, according to an embodiment of the present invention.
Fig. 7 is an example drawing showing that it is assumed that there are five common interlaces (e.g., common interlaces #0 to # 4), interlaces #0 to #4 in RB set 0 correspond to common interlaces #0 to #4, and interlaces #0 to #4 in RB set 1 correspond to common interlaces #0 to #4 (i.e., interlace #0 in RB set 1 may not correspond to the lowest RB in RB set 1).
Fig. 8 is an example drawing showing that it is assumed that there are five common interlaces (e.g., common interlaces #0 to # 4), interlaces #0 to #4 in RB set 0 correspond to common interlaces #0 to #4, and interlaces #0 to #4 in RB set 1 correspond to common interlaces #0 to #4 (i.e., #0 in RB set 1 may not correspond to the lowest RB in RB set 1).
Fig. 9 is an example diagram of a possible combination of RB sets for resource allocation of a side chain resource pool including 3 RB sets according to an embodiment of the present invention.
Fig. 10 is an example diagram illustrating an association between interlaces and subchannels in accordance with an embodiment of the present invention.
Fig. 11 is an example diagram illustrating that a UE may be configured with MCSt operation and/or operate/select resources in a SL resource pool during channel occupancy in a SL unlicensed spectrum, according to an embodiment of the present invention.
Fig. 12 is an example diagram illustrating a resource selection for a set of SL resources in a SL resource pool in a SL unlicensed spectrum, a UE may select a certain number of consecutive SL resources, according to an embodiment of the present invention.
Fig. 13 is an example diagram illustrating that a UE may determine or decide to select a set of SL resources for transmission of multiple MAC PDUs, according to an embodiment of the present invention.
Fig. 14 is a flow chart of a method of a first UE including receiving SCIs (with fields) indicating a number of contiguous RB sets and receiving PSSCHs based on one or more RB sets in accordance with an embodiment of the present invention.
Fig. 15 is a flow chart of a method of a first apparatus according to an embodiment of the present invention, the method comprising triggering or requesting a selection or reselection of resources based on sensing for performing one or more PSSCH transmissions or PSCCH transmissions, determining a first parameter for determining or initializing candidate multislot resources, receiving SCI for reserving one or more side link resources, selecting a number of side link resources, and performing the one or more PSSCH transmissions or PSCCH transmissions.
Fig. 16 is a flow chart of a method of a first apparatus according to an embodiment of the present invention, the method comprising triggering or requesting a selection or reselection of resources based on sensing for performing one or more PSSCH transmissions or PSCCH transmissions, determining whether to identify candidate resources including subchannels in more than one RB set, selecting a number of side link resources from the identified candidate resource sets, and performing the one or more PSSCH transmissions or PSCCH transmissions.
Detailed Description
The invention described herein may be applied to or implemented in exemplary wireless communication systems and devices described below. In addition, the present invention is mainly described in the context of a 3GPP architecture reference model. However, it should be appreciated that with the aid of the disclosed information, those skilled in the art may readily adapt for use and implement aspects of the present invention in 3GPP2 network architectures, as well as other network architectures.
The exemplary wireless communication systems and apparatus described below employ wireless communication systems that support broadcast services. 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 (code division multiple access, CDMA), time division multiple access (time division multiple access, TDMA), orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA), 3GPP long term evolution (Long Term Evolution, LTE) wireless access, 3GPP long term evolution advanced (Long Term Evolution Advanced, LTE-a) wireless access, 3GPP2 ultra mobile broadband (Ultra Mobile Broadband, UMB), wiMax, 3GPP New Radio (New Radio, NR), or some other modulation technique.
In particular, the exemplary wireless communication systems and devices described below may be designed to support one or more standards, such as those provided by a complex referred to herein as 3GPP, denominated "third generation partnership project," including: [1]3GPP TS 38.212V17.1.0 (2022-03) 3GPP; TSG RAN; NR; multiplexing and channel coding (version 17); [2]3GPP TS 38.214V17.1.0 (2022-03) 3GPP; TSG RAN; NR; physical layer program for data (version 17); [3]3GPP TS 38.212V17.1.0 (2022-03) 3GPP; TSG RAN; NR; multiplexing and channel coding (version 17); [4]3GPP TS 38.321v16.7.0 (2021-12) 3GPP; TSG RAN; medium Access Control (MAC) protocol specification (release 16); [5]3GPP TS 37.213V16.6.0 (2021-06) 3GPP; TSG RAN; a physical layer procedure for shared spectrum channel access (release 16); [6] unlicensed 5G new air interface: challenge and assessment Mohammed Hirzallah, marwan Krunz, balkan Kecicioglu and Belal Hamzeh (https:// arxiv. Org/pdf/2012.10937. Pdf); [7] RP-221938, "WID correction: NR side chain progression ", OPPO; [8]3GPP TSG RAN WG1#110 RAN1 chairman notes; and RAN1 chairman notes of [9]3GPP TSG RAN WG1#110bis-e. The standards and documents listed above are expressly and fully incorporated herein by reference in their entirety.
Fig. 1 illustrates a multiple access wireless communication system according to one embodiment of the present invention. AN access network 100 (AN) contains multiple antenna groups, one containing 104 and 106, another containing 108 and 110, and yet another containing 112 and 114. In fig. 1, only two antennas are shown for each antenna group, however, more or fewer antennas may be utilized for each antenna group. An Access Terminal (AT) 116 is in communication with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 over forward link 120 and receive information from AT 116 over reverse link 118. AT 122 is in communication with antennas 106 and 108, where antennas 106 and 108 transmit information to AT 122 over forward link 126 and receive information from AT 122 over reverse link 124. In an FDD system, communication links 118, 120, 124 and 126 may use different frequencies for communication. For example, forward link 120 may use a different frequency than that used by reverse link 118.
The antennas of each group and/or the area in which they are designed to communicate are often referred to as a sector of the access network. In an embodiment, antenna groups each are designed to communicate to access terminals in a sector of the areas covered by access network 100.
In communication via forward links 120 and 126, the transmit antennas of access network 100 utilize beamforming in order to improve signal-to-noise ratio of forward links for the different access terminals 116 and 122. In addition, an access network transmitting access terminals that are randomly dispersed in its coverage area using beamforming may have less interference to access terminals in neighboring cells than an access network transmitting all its access terminals via a single antenna.
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. An AT may also be referred to as a User Equipment (UE), a wireless communication device, a terminal, an access terminal, or some other terminology.
Fig. 2 is a simplified block diagram of an embodiment of a transmitter system 210 (also referred to as an access network) and a receiver system 250 (also referred to as an access terminal (ACCESS TERMINAL, AT) or User Equipment (UE)) in a MIMO system 200. At the transmitter system 210, traffic data for a number of data streams is provided from a data source 212 to a Transmit (TX) data processor 214.
In one embodiment, each data stream is transmitted through 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. Instructions executed by processor 230 may determine the data rate, coding, and modulation for each data stream. 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 N T modulation symbol streams to N T 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. N T modulated signals from transmitters 222a through 222t are then transmitted from N T antennas 224a through 224t, respectively.
At receiver system 250, the transmitted modulated signals are received by N R 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.
RX data processor 260 then receives and processes the N R received symbol streams from N R receivers 254 based on a particular receiver processing technique to provide N T "detected" symbol streams. 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.
The 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 reverse link message transmitted by receiver system 250. Processor 230 then determines which pre-coding matrix to use to determine the beamforming weights and then processes the extracted message.
Memory 232 may be used to temporarily store some of the buffered/calculated data from 240 or 242 via processor 230, store some of the buffered data from 212, or store some of the specific program code. Also, memory 272 may be used to temporarily store some buffered/calculated data from 260 via processor 270, store some buffered data from 236, or store some specific program code.
Turning to fig. 3, this figure shows an alternative simplified functional block diagram of a communication device in accordance with one embodiment of the present invention. As shown in fig. 3, a communication device 300 in a wireless communication system may be utilized for implementing UEs (or ATs) 116 and 122 in fig. 1, and the wireless communication system is preferably an NR system. The communication device 300 may include an input device 302, an output device 304, a control circuit 306, a central processing unit (central processing unit, CPU) 308, a memory 310, program code 312, and a transceiver 314. The control circuit 306 executes the program code 312 in the memory 310 via the CPU 308, thereby controlling the operation of the communication device 300. The communication device 300 may receive signals input by a user through an input device 302 (e.g., a keyboard or keypad) and may output images and sounds through an output device 304 (e.g., a monitor or speaker). The transceiver 314 is used to receive and transmit wireless signals, pass the received signals to the control circuit 306, and wirelessly output signals generated by the control circuit 306.
Fig. 4 is a simplified block diagram of the program code 312 shown in fig. 3 according to an embodiment of the present invention. In this embodiment, program code 312 includes an application layer 400, a layer 3 portion 402, and a layer 2 portion 404, and is coupled to a layer 1 portion 406. Layer 3 portion 402 typically performs radio resource control. Layer 2 portion 404 typically performs link control. Layer 1 portion 406 typically performs physical connections.
For LTE, LTE-a, or NR systems, layer 2 portion 404 may include a radio link control (Radio Link Control, RLC) layer and a medium access control (Medium Access Control, MAC) layer. Layer 3 portion 402 may include a radio resource control (Radio Resource Control, RRC) layer.
Any two or more of the following paragraphs, (sub-) bullets, gist, action, or claims describing each invention may be logically, reasonably, and appropriately combined to form a particular method.
Any sentence, paragraph, (sub) bullets, gist, action, or claim described in each of the following inventive paragraphs or chapters may be implemented independently and separately to form a specific method or apparatus. The following disclosure of the present invention is merely one possible embodiment, e.g., "based on", "more specifically", "example", etc., without limiting the specific method or apparatus.
In TS 38.214 ([ 2]3GPP TS 38.214V17.1.0 (2022-03) 3GPP; TSG RAN; NR; physical layer procedure for data (release 17)), SL-related procedures for data are specified.
* And the reference are respectively indicated by the terms "x", "and" x ", respectively
8 Physical side link shared channel correlation procedure
The UE may be configured by higher layers to have one or more side link resource pools. The side link resource pool may be used for transmission of the PSSCH as described in clause 8.1 or for receiving the PSSCH as described in clause 8.3 and may be associated with side link resource allocation pattern 1 or side link resource allocation pattern 2.
In the frequency domain, the side chain resource pool consists of sl-NumSubchannel contiguous subchannels. The sub-channel consists of sl-SubchannelSize consecutive PRBs, where sl-NumSubchannel and sl-SubchannelSize are higher layer parameters.
Time slot set routing capable of belonging to side link resource poolRepresentation, … therein
The UE determines the set of resource blocks assigned to the side link resource pool as follows:
The resource block pool consists of N PRB PRBs.
Sub-channel m (m=0, 1, …, numSubchannel-1) consists of a set of n subCHsize contiguous resource blocks with physical resource block number n PRB＝nsubCHRBstart+m·nsubCHsize+j(j＝0,1,…,nsubCHsize -1, where n subCHRBstart and n subCHsize are given by the higher layer parameters sl-StartRB-Subchannel and sl-SubchannelSize, respectively
…
8.1 UE procedure for transmitting physical side chain shared channel
Each PSSCH transmission is associated with a PSCCH transmission.
The PSCCH transmission carrying a level 1 SCI associated with a PSCCH transmission; the SCI associated with level 2 is carried within the resources of the PSSCH.
If the UE transmits SCI format 1-a on PSCCH according to PSCCH resource configuration in slot n and PSCCH resource m, then for the associated PSCCH transmission in the same slot
…
Resource allocation in 8.1.2.1 time domain
The UE will transmit the PSCCH in the same slot as the associated PSCCH.
The minimum resource allocation unit in the time domain is a slot.
…
Resource allocation in 8.1.2.2 frequency domain
The resource allocation unit in the frequency domain is a subchannel.
The subchannel assignment for the side-link transmission is determined using the "frequency resource assignment" field in the associated SCI.
The lowest subchannel used for side link transmission is the subchannel of the lowest PRB on which the associated PSCCH is transmitted.
If the PSSCH scheduled by the PSCCH is to overlap with the PSCCH-containing resources, then the resources of the union of the PSCCH corresponding to the scheduled PSSCH and the associated PSCCH DM-RS are not available for the PSSCH.
…
8.1.4 UE procedure for determining a subset of resources to report to higher layers in PSSCH resource selection in side link resource allocation mode 2
In resource allocation mode 2, the higher layer may request the UE to determine a subset of resources from which the higher layer will select resources for the PSSCH/PSCCH transmission. To trigger this procedure, in slot n, the higher layer provides the following parameters for this PSSCH/PSCCH transmission:
-a pool of resources from which resources are to be reported;
-L1 priority, prio TX;
-a remaining packet delay budget;
-the number of sub-channels L subCH to be used for PSSCH/PSCCH transmission in a slot;
Optionally, the resource reservation interval P rsvp_TX is in milliseconds.
-…
The following higher layer parameters affect this procedure:
-sl-SelectionWindowList-the internal parameter T 2min is set to the corresponding value from the higher layer parameter sl-SelectionWindowList for a given value of prio TX.
This higher layer parameter provides an RSRP threshold for each combination (p i,pj), where p i is the value of the priority field in the received SCI format 1-a and p j is the priority of the UE's transmission of the selected resource; for a given call to this program, p j＝prioTX.
-Sl-RS-ForSensing selecting whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurements as defined in clause 8.4.2.1.
-sl-ResourceReservePeriodList
The internal parameter T 0 is defined as the number of slots corresponding to sl-SensingWindow ms
-Sl-TxPercentageList the internal parameter X for a given prio TX is defined as sl-TxPercentageList (prio TX) converted from percentage to ratio
-…
The resource reservation interval P rsvp_TX (if provided) is converted from a millisecond unit to a logical slot unit, resulting in P' rsvp_TX according to clause 8.1.7.
The UE performs full sensing when the resource pool is (pre) configured with allowedResourceSelectionConfig including full sensing and full sensing is (pre) configured by higher layers in the UE.
…
Annotation:
Represents a set of time slots belonging to a side link resource pool and is defined in clause 8.
The following steps are used:
1) The candidate single-slot resource R x,y for transmission is defined as being in a slot L subCH contiguous subchannels having subchannel x+j, where j=0. The UE shall assume that any set of L subCH contiguous subchannels contained in the corresponding resource pool within the time interval [ n+t 1,n+T2 ] corresponds to one candidate single-slot resource for the UE to perform full sensing, one candidate single-slot resource in the set of Y candidate slots within the time interval [ n+t 1,n+T2 ] for the UE to perform periodicity based partial sensing, or one candidate single-slot resource in the set of Y' candidate slots within the time interval [ n+t 1,n+T2 ] for the UE to perform contiguous partial sensing in the case of P rsvp_TX =0, wherein
Selection of T 1 atThe following depends on the UE implementation, where/>Defined in slots in table 8.1.4-2, where μ SL is the SCS configuration of SL BWP;
If T 2min is shorter than the remaining packet delay budget (in time slots), then T 2 is dependent on the UE implementation, where T 2min≤T2 is less than or equal to the remaining packet delay budget (in time slots); otherwise T 2 is set to the remaining packet delay budget (in time slots).
Y is selected by the UE, wherein Y.gtoreq.Y min.
-…
The total number of candidate single-slot resources is denoted by M Total number of .
2) When the UE performs full sensing, the sensing window is defined by the slot rangeDefinition, wherein T 0 is defined above and/>Defined in time slots in table 8.1.4-1, where μ SL is the SCS configuration of SL BWP. The UE should monitor the time slots belonging to the side link resource pool within the sensing window except for the time slots where its own transmissions occur. The UE will perform the actions in the subsequent steps based on the PSCCH decoded in these slots and the measured RSRP.
…
Whether the UE needs to perform SL reception of PSCCH and RSRP measurements for partial sensing on slots in the SL DRX inactivity time is enabled/disabled by higher layer parameters PARTIALSENSINGINACTIVETIME. When enabled, if the UE performs periodicity-based partial sensing on a slot in SL DRX inactivity time for a given periodicity corresponding to P Reservation , the UE monitors only a default periodic sensing occasion (most recent sensing occasion) from the slot; if the UE performs contiguous partial sensing on a slot in SL DRX inactive time, the UE monitors a minimum of M slots from the slots.
3) The internal parameter Th (p i,pj) is set to the corresponding value of the RSRP threshold indicated by the i-Th field in the sl-Thres-RSRP-List, where i=p i+(pj -1) x 8.
4) Set S A is initialized to the set of all candidate single-slot resources.
5) The UE shall exclude any candidate single slot resource R x,y from set S A, provided that it satisfies all of the following conditions:
UE not monitoring time slots in step 2
-For any periodicity value followed by a higher layer parameter sl-ResourceReservePeriodList and in a time slot having a 'resource reservation period' field set to said periodicity valueThe hypothetical SCI format 1-a, which received and indicated all sub-channels of the resource pool in this slot, will satisfy condition c in step 6.
5A) If the number of candidate single-slot resources R x,y remaining in set S A is less than X.M Total number of , then set S A is initialized to the set of all candidate single-slot resources as in step 4.
6) The UE shall exclude any candidate single slot resource R x,y from set S A, provided that it satisfies all of the following conditions:
a) UE in slot The received SCI format 1-a, and the 'resource reservation period' (if present) and 'priority' fields in the received SCI format 1-a indicate values P rsvp_RX and prio RX, respectively, according to clause 16.4 in [6, ts 38.213 ];
b) The RSRP measurement performed is higher than Th (prio RX,prioTX) according to clause 8.4.2.1 for the received SCI format 1-a;
c) In time slot In the received SCI format or if and only if there is a 'resource reservation period' field in the received SCI format 1-aThe same SCI format received in (1) is determined and matched according to clause 8.1.5Overlapping sets of resource blocks and slots, where q=1, 2, …, Q and j=0, 1, …, C resel -1. Here, P ' rsvp_RX is P rsvp_RX converted to logical time slot units according to clause 8.1.7, if P rsvp_RX<Tscal and n ' -m.ltoreq.P ' rsvp_RX, then/> Wherein if the UE is configured with full sensing by its higher layers, if slot n belongs to the setThen/>Otherwise time slot/>Is of the type set/> Is a first time slot after time slot n; if the UE is configured with partial sensing by its higher layers, if slot/>Belonging to the collection/>ThenOtherwise time slot/>Is of the type set/> In time slot/>The first time slot thereafter. Otherwise q=1. If the UE is configured with full sensing by its higher layers, T scal is set to transition to the selection window size in milliseconds T 2. If the UE is configured with partial sensing by its higher layers, thenShould be converted into milliseconds, with time slot/>Is the last slot of the Y or Y' candidate slots. Time slot/>Is the first slot of the selected/remaining set of Y or Y' candidate slots.
6A) This step is only performed when the procedure in clause 8.1.4A is triggered.
6B) This step is only performed when the procedure in clause 8.1.4C is triggered.
7) If the number of candidate single-slot resources remaining in set S A is less than X.M Total number of , then Th (p i,pj) is increased by 3dB for each priority value Th (p i,pj), and the procedure continues with step 4.
7A) If the side link DRX on time of the RX UE is provided by a higher layer and candidate single-slot resources are not reserved for the side link DRX on time in set S A, the UE additionally selects and includes at least one candidate single-slot resource for the side link DRX on time in set S A based on its implementation.
The UE should report the set S A to a higher layer.
…
8.1.5 UE procedure for determining time slots and resource blocks for PSSCH transmission associated with SCI Format 1-A
The set of slots and resource blocks for PSSCH transmission is determined by the resources for PSCCH transmission containing the associated SCI format 1-A and the fields 'frequency resource assignment', 'time resource assignment' for the associated SCI format 1-A, as described below.
When sl-MaxNumPerReserve is 2, the 'time resource assignment' carries a logical slot offset indication of n=1 or 2 actual resources, and when sl-MaxNumPerReserve is 3 carries a logical slot offset indication of n=1 or 2 or 3 actual resources, in the form of a Time RIV (TRIV) field, determined as follows:
…
Wherein the first resource is in a slot where SCI format 1-a is received and t i represents an i-th resource time offset relative to the first resource in a logical slot of the resource pool, where 1.ltoreq.t 1.ltoreq.31 for n=2 and 1.ltoreq.t 1≤30,t1<t2.ltoreq.31 for n=3.
The start subchannel of the first resourceIs determined according to clause 8.1.2.2. The number of contiguous allocated subchannels for each of the N resources, L subCH. Gtoreq.1, and the starting subchannel index for the resource indicated by the received SCI format 1-A is determined from a "frequency resource assignment" equal to the Frequency RIV (FRIV), except for the resource in the time slot in which the received SCI format 1-A is received, wherein
If sl-MaxNumPerReserve is 2, then
If sl-MaxNumPerReserve is 3, then
Wherein the method comprises the steps of
-Start subchannel index representing second resource
-Start subchannel index representing third resource
-Is the number of sub-channels in the resource pool provided according to the higher layer parameter sl-NumSubchannel
If TRIV indicates N < sl-MaxNumPerReserve, then the starting subchannel index corresponding to sl-MaxNumPerReserve minus the N last resources is not used.
…
8.3 UE procedure for receiving physical side chain shared channel
For side link resource allocation pattern 1, after detecting SCI format 1-a on the PSCCH, the UE may decode the PSSCH according to the detected SCI formats 2-a and 2-B and the associated PSSCH resource configuration configured by higher layers. The UE need not decode more than one PSCCH at each PSCCH resource candidate.
For side link resource allocation pattern 2, after detecting SCI format 1-a on the PSCCH, the UE may decode the PSSCH according to the detected SCI formats 2-a and 2-B and the associated PSSCH resource configuration configured by higher layers. The UE need not decode more than one PSCCH at each PSCCH resource candidate.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively, as defined herein
In TS 38.212 ([ 3]3GPP TS 38.212V17.1.0 (2022-03) 3GPP; TSG RAN; NR; multiplexing and channel coding (release 17)), the SCI format for the side link is specified.
* The term "x" and "x" refer to the same or different terms of x, and y, respectively, and mean the number of "x" and "x" as defined herein
8.3 Side link control information on PSCCH
The SCI carried on the PSCCH is a level 1 SCI that transmits side link scheduling information.
8.3.1 Level 1SCI Format
…
8.3.1.1SCI Format 1-A
SCI format 1-A for scheduling PSSCH and level 2 SCI on PSSCH
The following information is transmitted by means of SCI format 1-a:
Priority-3 bits as specified in clause 5.4.3.3 of [12, TS23.287] and clause 5.22.1.3.1 of [8, TS 38.321 ]. The value '000' of the priority field corresponds to the priority value '1', the value '001' of the priority field corresponds to the priority value '2', and so on.
-Frequency resource assignment- …
-Time resource assignment-5 bits, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise 9 bits, at which time the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, ts 38.214 ].
Resource reservation period-Bits as defined in clause 16.4 of [5, ts 38.213], where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList, provided that the higher layer parameter sl-MultiReserveResource is configured; otherwise 0 bits.
DMRS pattern-Bits, as defined in clause 8.4.1.1.2 of [4, ts 38.211], where N Mode is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TIMEPATTERNLIST.
Level 2 SCI format-2 bits, as defined in table 8.3.1.1-1.
-…
Table 8.3.1.1-1: level 2 SCI format
| Value of SCI format field level 2 | Level 2 SCI format |
| 00 | SCI Format 2-A |
| 01 | SCI Format 2-B |
| 10 | SCI format 2-C |
| 11 | Reservation |
…
8.4 Side link control information on PSSCH
The SCI carried on the PSSCH is a level 2 SCI that conveys side link scheduling information and/or inter-UE coordination related information.
8.4.1 Level 2 SCI Format
…
8.4.1.1SCI Format 2-A
SCI format 2-a is used to decode PSSCH through HARQ operation when HARQ-ACK information contains ACK or NACK, when HARQ-ACK information contains NACK only, or when feedback of HARQ-ACK information does not exist.
The following information is transmitted by means of SCI format 2-a:
-HARQ process number-4 bits.
-New data indicator-1 bit.
Redundancy version-2 bits, as defined in table 7.3.1.1.1-2.
Source ID-8 bits as defined in clause 8.1 of [6, ts 38.214 ].
Destination ID-16 bits as defined in clause 8.1 of [6, ts 38.214 ].
-HARQ feedback enable/disable indicator-1 bit as defined in clause 16.3 of [5, ts 38.213 ].
Broadcast type indicator-2 bits as defined in table 8.4.1.1-1 and clause 8.1 of [6, ts 38.214 ].
-CSI request-1 bit as defined in clause 8.2.1 of [6, ts 38.214] and in clause 8.1 of [6, ts 38.214 ].
Table 8.4.1.1-1: broadcast type indicator
8.4.1.2SCI Format 2-B
SCI format 2-B is used to decode PSSCH through HARQ operation when HARQ-ACK information contains only NACK or when there is no feedback of HARQ-ACK information.
The following information is transmitted by means of SCI format 2-B:
-HARQ process number-4 bits.
-New data indicator-1 bit.
Redundancy version-2 bits, as defined in table 7.3.1.1.1-2.
Source ID-8 bits as defined in clause 8.1 of [6, ts 38.214 ].
Destination ID-16 bits as defined in clause 8.1 of [6, ts 38.214 ].
-HARQ feedback enable/disable indicator-1 bit as defined in clause 16.3 of [5, ts 38.213 ].
Zone ID-12 bits as defined in clause 5.8.11 of [9, TS 38.331 ].
-Communication range requires-4 bits, determined by the higher layer parameters sl-ZoneConfigMCR-Index.
8.4.1.3SCI Format 2-C
SCI format 2-C is used for decoding of PSSCH and provides or requests inter-UE coordination information.
The following information is transmitted by means of SCI format 2-C:
-HARQ process number-4 bits
New data indicator-1 bit
Redundancy version-2 bits as defined in table 7.3.1.1.1-2
Source ID-8 bits as defined in clause 8.1 of [6, TS 38.214]
Destination ID-16 bits as defined in clause 8.1 of [6, TS 38.214]
-HARQ feedback enable/disable indicator-1 bit as defined in clause 16.3 of [5, ts 38.213]
-CSI request-1 bit as defined in clause 8.2.1 of [6, ts 38.214] and in clause 8.1 of [6, ts 38.214]
-Provide/request indicator-1 bit, wherein a value of 0 indicates that SCI format 2-C is used for providing inter-UE coordination information and a value of 1 indicates that SCI format 2-C is used for requesting inter-UE coordination information
… 8.4.5 Multiplexing of coded level 2 SCI bits to PSSCH
The encoded level 2 SCI bits are multiplexed onto the PSSCH according to the procedure in clause 8.2.1.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively
In [4]3GPP TS 38.321v16.7.0 (2021-12) 3GPP; TSG RAN; in the Medium Access Control (MAC) protocol specification (release 16), LBT related operations and SL operations are referred to below:
* The term "x" and "x" refer to the same or different amounts of a compound as defined herein, i.e., a compound having the same or different amounts of the above-described components
5.21LBT operation
5.21.1 General rule
The lower layer may perform an LBT procedure, see TS 37.213[18], according to which the lower layer does not perform transmission if the channel is identified as occupied. When the lower layer performs an LBT procedure before transmission and does not perform transmission, an LBT failure indication is transmitted from the lower layer to the MAC entity. Unless otherwise specified, when the LBT program is executed for transmission, an action as specified in the present specification is performed regardless of the LBT failure indication received from the lower layer. When LBT is not performed by the lower layer, no LBT failure indication is received from the lower layer.
5.22SL-SCH data delivery
5.22.1SL-SCH data transmission
5.22.1.1SL grant reception and SCI transmission
…
If the MAC entity has been configured with side link resource allocation pattern 2 to use resource pool transmission in carriers, as indicated in TS 38.331[5] or TS 36.331[21] based on sensing or partial sensing or random selection or any combination thereof, then the MAC entity will be for each side link process:
Note 1: if the MAC entity is configured with side-link resource allocation pattern 2 to use resource pool transmission in carriers, as indicated in TS 38.331[5] or TS 36.331[21], then the MAC entity may generate selected side-link grants on the resource pool only after releasing the configured side-link grant(s), if present, based on random selection or partial or full sensing.
1> If the MAC entity has selected to create a selected configured side-link grant corresponding to the transmission of multiple MAC PDUs, and SL data is available in the logical channel:
2> … 2> if TX resource selection (reselection) is triggered due to TX resource selection (reselection) check:
3> if one or more SL DRX is configured in a destination UE receiving SL-SCH data:
4> indicates to the physical layer the SL DRX on time in the destination UE receiving the SL-SCH data as specified in clause 5.28.2.
3> Selecting one of the allowed values configured by RRC in sl-ResourceReservePeriodList and setting a resource reservation interval P rsvp_TX having the selected value;
3> randomly selecting with equal probability integer values in interval [5, 15] for resource reservation intervals or intervals of greater than or equal to 100ms For RESOURCE reservation intervals below 100ms, and set SL _ RESOURCE _ RESELECTION _ COUNTER to a selected value;
3> selecting the number of HARQ retransmissions from the allowed number in sl-MaxTxTransNumPSSCH configured by RRC in sl-PSSCH-TxConfigList and, if configured by RRC, the highest priority for logical channel(s) allowed on the carrier and the allowed number of overlaps in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList as measured by the lower layer according to clause 5.1.27 of TS 38.215[24] (if CBR measurements are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurements are not available);
3> selecting an amount of frequency resources in a range configured by RRC between sl-MinSubChannelNumPSSCH and sl-MaxSubchannelNumPSSCH contained in sl-PSSCH-TxConfigList, and in a range overlapping between MinSubChannelNumPSSCH and MaxSubchannelNumPSSCH indicated in sl-CBR-PriorityTxConfigList for the highest priority of logical channel(s) allowed on the carrier if configured by RRC and CBR (if CBR measurement is available) measured by lower layer according to clause 5.1.27 of TS 38.215[24] or corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement is not available);
3> interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition to implement reception of preferred and non-preferred resource sets if not configured by RRC:
4> if the transmission based on random selection is configured by the upper layer:
5> randomly selecting time and frequency resources for one transmission opportunity from a pool of resources occurring within a SL DRX on time as specified in clause 5.28.2 of a destination UE selected for indicating the above SL DRX on time to the physical layer, depending on the amount of selected frequency resources and the remaining PDBs of SL data available in logical channels allowed on the carrier.
5> If the selected resources for the initial transmission occasion are not in the SL DRX on time as specified in 5.28.1 for any destination with data to send:
6> use retransmission occasion for initial transmission of PSCCH and PSSCH.
4> Otherwise:
5> randomly selecting time and frequency resources for one transmission opportunity from resources indicated by the physical layer as specified in clause 8.1.4 of TS 38.214[7] occurring within a SL DRX on time as specified in clause 5.28.2 of a destination UE selected for indicating the above SL DRX on time to the physical layer, according to the amount of selected frequency resources and the remaining PDB of SL data available in logical channels allowed on the carrier.
3>…r
3> If one or more HARQ retransmissions are selected:
4> interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition to enable reception of preferred and non-preferred resource sets if not configured by RRC:
5> if the transmission based on full or partial sensing is configured by the upper layer and according to clause 8.1.4 of TS 38.214[7] leaves available resources in the resources indicated by the physical layer for more transmission opportunities; or (b)
5> If a transmission based on random selection is configured by the upper layer and leaves available resources in the resource pool for more transmission opportunities:
6> by ensuring a minimum time gap between any two selected resources if PSFCH is configured for this resource pool and retransmission resources can be indicated by the time resource assignment of the previous SCI according to clause 8.3.1.1 of TS 38.212[9], time and frequency resources are randomly selected for one or more transmission opportunities from available resources occurring within the SL DRX on time as specified in clause 5.28.2 of the destination UE, which is selected for indicating the above-mentioned SL DRX on time to the physical layer, according to the amount of selected frequency resources, the selected number of HARQ retransmissions, and the remaining PDBs of the SL data available in the logical channels allowed on the carrier.
4>…
4> Selecting a set of periodic resources separated by resource reservation intervals using the randomly selected resources for transmitting PSCCHs and PSCCHs corresponding to the number of retransmission opportunities of the MAC PDU determined in TS 38.214[7 ];
4> treat the first set of transmission opportunities as initial transmission opportunities and treat the other set of transmission opportunities as retransmission opportunities;
4> treat the set of initial transmission opportunities and retransmission opportunities as the selected side link grant.
3> Otherwise:
4> treat the set as the selected side link grant.
3> Using the selected side link grant to determine the PSCCH duration set and the PSSCH duration set from TS 38.214[7 ].
2>…
1> If the MAC entity has selected to create a selected side link grant corresponding to the transmission(s) of a single MAC PDU, and if SL data is available in the logical channel, or trigger SL-CSI reporting:
2>…
2> otherwise, if SL data is available in the logical channel:
3> if sl-HARQ-FeedbackEnabled is set to enabled for the logical channel:
4> if configured, any resource pool configured with PSFCH resources among the resource pools is selected, except for the pool in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon.
3> Otherwise:
4> if configured, any of the resource pools is selected, except for the pool in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon.
2> Performing a TX resource selection (reselection) check on the selected resource pool as specified in clause 5.22.1.2;
2> if TX resource selection (reselection) is triggered due to TX resource selection (reselection) check:
3> if one or more SL DRX is configured in a destination UE receiving SL-SCH data:
4> indicates to the physical layer the SL DRX on time in the destination UE receiving the SL-SCH data as specified in clause 5.28.2.
3> Selecting the number of HARQ retransmissions from the allowed number in sl-MaxTxTransNumPSSCH configured by RRC in sl-PSSCH-TxConfigList and, if configured by RRC, the highest priority for logical channel(s) allowed on the carrier and the allowed number of overlaps in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList as measured by the lower layer according to clause 5.1.27 of TS 38.215[24] (if CBR measurements are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurements are not available);
3> selecting an amount of frequency resources in a range configured by RRC between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH contained in sl-PSSCH-TxConfigList, and in a range overlapping between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH indicated in sl-CBR-PriorityTxConfigList for highest priority of logical channel(s) allowed on the carrier if configured by RRC and CBR (if CBR measurement is available) measured by lower layer according to clause 5.1.27 of TS 38.215[24] or corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement is not available);
3> interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition to implement reception of preferred and non-preferred resource sets if not configured by RRC:
4> if the transmission based on random selection is configured by the upper layer:
5> randomly selecting time and frequency resources for one transmission opportunity from a pool of resources occurring within a SL DRX on time as specified in clause 5.28.2 of a destination UE selected for indicating the above SL DRX on time to the physical layer, based on the amount of selected frequency resources and the remaining PDBs of the SL data available in the logical channels allowed on the carrier and the latency requirement of the triggered SL CSI report.
4> Otherwise:
5> time and frequency resources for one transmission opportunity are randomly selected from resources indicated by the physical layer as specified in clause 8.1.4 of TS 38.214[7] occurring within the SL DRX on time as specified in clause 5.28.2 of the destination UE selected to indicate the above-mentioned SL DRX on time to the physical layer, depending on the amount of selected frequency resources and the latency requirements of the remaining PDBs of the SL data and/or triggered SL-CSI reports available in the logical channels allowed on the carrier.
3>…
3> If one or more HARQ retransmissions are selected:
4> interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition to enable reception of preferred and non-preferred resource sets if not configured by RRC:
5> if the transmission based on the sensing or partial sensing is configured by the upper layer and leaves available resources in the resources indicated by the physical layer for more transmission opportunities according to clause 8.1.4 of TS 38.214[7 ]; or (b)
5> If a transmission based on random selection is configured by the upper layer and leaves available resources in the resource pool for more transmission opportunities:
6> by ensuring a minimum time gap between any two selected resources if PSFCH is configured for this resource pool and retransmission resources can be indicated by the time resource assignment of the previous SCI according to clause 8.3.1.1 of TS 38.212[9], randomly selecting time and frequency resources for one or more transmission opportunities from available resources occurring within the SL DRX on time as specified in clause 5.28.2 of the destination UE, which is selected for indicating the above-mentioned SL DRX on time to the physical layer, according to the amount of selected frequency resources, the selected number of HARQ retransmissions and the latency requirements of the triggered SL-CSI and the remaining PDBs of the SL data available in the logical channels allowed on the carrier;
6> treat the first transmission opportunity occurring in time as an initial transmission opportunity and treat the other transmission opportunities as retransmission opportunities;
6> treat all transmission opportunities as selected side link grants.
4>…
4> Selecting a set of periodic resources separated by resource reservation intervals using the randomly selected resources for transmitting PSCCHs and PSCCHs corresponding to the number of retransmission opportunities of the MAC PDU determined in TS 38.214[7 ];
4> treat the first set of transmission opportunities as initial transmission opportunities and treat the other set of transmission opportunities as retransmission opportunities;
4> treat the set of initial transmission opportunities and retransmission opportunities as the selected side link grant.
3> Otherwise:
4> treat the set as the selected side link grant.
3> Use selected side link grants to determine PSCCH duration and PSSCH duration from TS 38.214[7 ].
…
5.22.1.3 Side link HARQ operation
5.22.1.3.1 Side link HARQ entity
The MAC entity contains at most one side link HARQ entity for transmitting on the SL-SCH, maintaining multiple parallel side link processes.
The maximum number of transmit side link processes associated with the side link HARQ entity is 16. The side link process may be configured to transmit a plurality of MAC PDUs. To transmit multiple MAC PDUs in side link resource allocation mode 2, the maximum number of transmit side link processes associated with the side link HARQ entity is 4.
The delivered side link grant and its associated side link transfer information are associated with the side link progress. Each side link process supports one TB.
For each side link grant, the side link HARQ entity will:
1> if the MAC entity determines that the side link grant is for initial transmission, as specified in clause 5.22.1.1; or (b)
1> If the side link grant is a configured side link grant and the MAC PDU is not obtained in sl-PeriodCG of the configured side link grant; or (b)
1> If the side link grant is a dynamic side link grant or a selected side link grant, and when the PSCCH duration and the level 2 SCI on the PSSCH of the previous side link grant are not in the SL DRX active time as specified in clause 5.28.1 with the destination of the data to be sent, no MAC PDU is obtained in the previous side link grant:
Note 1: empty.
2> Associate a side link process (re) to this grant, and for the associated side link process:
2> if all PSCCH durations and PSSCH durations for initial transmission of MAC PDUs for dynamic side link grants or configured side link grants are not in the SL DRX active time as specified in clause 5.28.1 with destination of data to be sent:
3> ignores side link grants.
Note 1A: the side-link HARQ entity will associate the selected side-link grant to the side-link process determined by the MAC entity.
3> Obtaining MAC PDUs for transmission from the multiplexing and aggregation entity (if present);
3> if MAC PDU for transmission has been obtained:
4> if HARQ process ID has been set for the side link grant:
5> to (re) associate HARQ process ID corresponding to the side link grant to the side link process.
4> Side link transfer information of a TB for a source and destination pair of MAC PDU is determined as follows:
5> set source layer 1ID to 8LSB of source layer 2ID of MAC PDU;
5> set destination layer 1ID to 16LSB of destination layer 2ID of MAC PDU;
5> to (re) associate the side link process to the side link process ID;
Note 1b: how the UE determines the side chain process ID in SCI depends on the UE implementation for the NR side link.
5> Considering that NDI has been toggled compared to the previously transmitted values of the side link identification information and the side link process ID corresponding to the MAC PDU, and setting NDI to the toggled value;
5> setting the broadcast type indicator to one of broadcast, multicast, and unicast indicated by an upper layer;
5>…
4> delivering MAC PDU, side link grant and side link transport information of TB to associated side link process;
4> indicates that the associated side link process triggers a new transfer.
3> Otherwise:
4> flushing the HARQ buffer of the associated side link process.
….22.1.3.1A side link procedure
The side link process is associated with the HARQ buffer.
The new transmission and retransmission is performed on the resources indicated in the side link grant specified in clause 5.22.1.1 with the MCS selected as specified in clause 8.1.3.1 and clause 5.22.1.1 of TS 38.214[7 ].
If the side link process is configured to perform transmission of multiple MAC PDUs with side link RESOURCE allocation pattern 2, the process maintains a COUNTER sl_resource_ RESELECTION _counter. For other configurations of the side link process, this counter is not available.
5.22.1.4 Multiplexing and combining
For a PDU associated with one SCI, the MAC will consider only the logical channel with the same source layer 2 ID-destination layer 2ID pair for one of unicast, multicast and broadcast associated with that pair. Allowing multiple transmissions for different side link processes to be performed independently in different PSSCH durations.
5.22.1.4.1 Logical channel prioritization
5.22.1.4.1.1 General rule
The application side link logical channel prioritization procedure is applied each time a new transmission is performed.
Scheduling of RRC control side link data by signaling for each logical channel:
-sl-Priority, wherein an increased Priority value indicates a lower Priority;
-sl-PrioritisedBitRate, which sets the side link prioritized bit rate (sidelink Prioritized Bit Rate, sPBR);
-sl-BucketSizeDuration, which sets the side link bucket size duration (sidelink Bucket Size Duration, sBSD).
…
The following UE variables are used for the logical channel prioritization procedure:
SBj, which are maintained for each logical channel j.
When setting up a logical channel, the MAC entity should initialize SBj of the logical channel to zero.
For each logical channel j, the MAC entity should:
1> prior to each instance of the LCP procedure, SBj is incremented by the product sPBR x T, where T is the time elapsed since the last increment of SBj;
1> if SBj has a value greater than the side link bucket size (i.e., sPBR x sBSD):
2> SBj is set to side link bucket size.
5.22.1.4.1.2 Selection of logical channels
For each SCI corresponding to a new transmission, the MAC entity should:
1> if sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon is configured according to TS 38.331[5 ]:
2> if the new transmission is associated with a side-link grant in sl-DiscTxPoolSelected or sl-DiscTxPoolScheduling configured in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon:
3>…
2> otherwise:
3> selecting a destination associated with one of unicast, multicast and broadcast (excluding a destination associated with side link discovery as specified in TS 23.304[26 ]) among the logical channels satisfying all of the following conditions and the MAC CEs (if present) for SL grants associated to SCI, which has at least one of the MAC CE and logical channel with the highest priority:
4> SL data is available for transfer; and
4> In the presence of any logical channel having SBj >0, SBj >0; and
4> In the configured case, SL-configuredGrantType1Allowed is set to true if the SL grant is configured grant type 1; and
4> In the configured case, SL-AllowedCG-List includes configured grant index associated to SL grant; and
4> If PSFCH is not configured for SL grants associated to SCI, then SL-HARQ-FeedbackEnabled is set to inactive.
1> Otherwise:
2> selecting a destination associated to one of unicast, multicast and broadcast, which has at least one of a MAC CE and a logical channel with highest priority among a logical channel satisfying all of the following conditions and a MAC CE (if present) for a SL grant associated to SCI in a SL active time for a SL transmission opportunity in case that the SL DRX is applied to the destination:
3> SL data is available for transfer; and
3> In the presence of any logical channel having SBj >0, SBj >0; and
3> In the configured case, SL-configuredGrantType1Allowed is set to true if the SL grant is configured grant type 1; and
3> In the configured case, SL-AllowedCG-List includes configured grant index associated to SL grant; and
3> If PSFCH is not configured for SL grants associated to SCI, then SL-HARQ-FeedbackEnabled is set to inactive.
1> Selecting a logical channel satisfying all of the following conditions among logical channels belonging to a selected destination:
2> SL data is available for transfer; and
2>…
5.22.1.4.1.3 Side link resource allocation
For each SCI corresponding to a new transmission, the MAC entity should:
1> allocates resources to logical channels as follows:
2> the logical channels selected for the SL grant in which SBj >0 are allocated resources in descending priority order in clause 5.22.1.4.1.2. If sPBR of the logical channels are set to infinity, the MAC entity should allocate resources for all data available for transmission on the logical channels before meeting sPBR of the lower priority logical channels;
2> will SBj decrement the total size of the MAC SDU serving the logical channel j;
2> if any resources are reserved, all logical channels selected in clause 5.22.1.4.1.2 are serviced in a strictly decreasing priority order (regardless of the value of SBj) until the data or SL grants for the logical channels are exhausted, whichever occurs first. Logical channels configured with the same priority should be equally serviced.
Note that: SBj may be negative.
…
5.22.1.4.2MAC multiplexing of control elements and MAC SDUs
The MAC entity should multiplex the MAC CE and the MAC SDU in the MAC PDU according to clauses 5.22.1.4.1 and 6.1.6.
…
5.22.2SL-SCH data reception
5.22.2.1SCI receive
The SCI indicates whether there is transmission on the SL-SCH and provides relevant HARQ information. SCI consists of two parts: level 1 SCI on PSCCH and level 2 SCI on PSSCH as specified in clause 8.1 of TS 38.214[7 ].
The MAC entity will:
1> for each PSCCH duration during which a MAC entity monitors a PSCCH:
2> if the level 1 SCI has been received on the PSCCH:
3> determining a set of PSSCH durations in which the received portion of SCI is used for reception of level 2 SCI and transport blocks;
3> if a level 2 SCI for this PSSCH duration has been received on the PSSCH:
4> storing the SCI as an SCI valid for a PSSCH duration corresponding to the transport block and the transmission of the associated HARQ information and QoS information;
1> for each PSSCH duration for which the MAC entity has a valid SCI:
2> delivering SCI and associated side link transfer information to the side link HARQ entity.
5.22.2.2 Side link HARQ operation
5.22.2.2.1 Side link HARQ entity
There is at most one side link HARQ entity at the MAC entity for reception of the SL-SCH, maintaining multiple parallel side link processes.
Each side link process is associated with a SCI in which the MAC entity is of interest. This interest is determined by the side chain signature information of the SCI. The side link HARQ entity directs the side link transport information and associated TBs received on the SL-SCH to the corresponding side link process.
…
* The term "x" and "x" refer to the same or different amounts of a compound as defined herein, i.e., a compound having the same or different amounts of the chemical components as defined herein
In [5]3GPP TS 37.213V16.6.0 (2021-06) 3GPP; TSG RAN; in the physical layer procedure for shared spectrum channel access (release 16), the channel procedure for unlicensed spectrum is referred to below.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, mean the same or different terms, including "x" and "x", as defined herein, respectively
4-Channel access procedure
4.0 General rule
Unless otherwise indicated, the following definitions may apply to the terms used in this specification below:
A channel refers to a carrier or a part of a carrier, consisting of a continuous set of Resource Blocks (RBs) on which a channel access procedure is performed in a shared spectrum.
The channel access procedure is a sensing-based procedure that evaluates the availability of channels for performing transmissions. The basic unit for sensing is a sensing time slot, which has a duration of T sl =9us. The sensing time slot duration T sl is considered idle, provided that the eNB/gNB or UE senses the channel during the sensing time slot duration and determines that the power detected for at least 4us during the sensing time slot duration is less than the energy detection threshold X Thresh. Otherwise, the sensing slot duration T sl is considered busy.
Channel occupancy refers to the transmission of an eNB/gNB/UE on a channel after performing the corresponding channel access procedure in this clause.
Channel occupancy time refers to the total time that the eNB/gNB/UE and any eNB/gNB/UE that is occupied by the shared channel perform a transmission on the channel after the eNB/gNB/UE performs the corresponding channel access procedure described in this clause. In order to determine the channel occupancy time, in case the transmission gap is less than or equal to 25us, the gap duration is counted in the channel occupancy time. The channel occupation time may be shared for transmissions between the eNB/gNB and the corresponding UE.
DL transmission bursts are defined as the set of transmissions from the eNB/gNB without any gaps greater than 16 us. Transmissions from the eNB/gNB separated by a gap of greater than 16us are considered separate DL transmission bursts. The eNB/gNB may transmit transmissions after a gap within the DL transmission burst without sensing availability of the corresponding channel.
UL transmission burst is defined as the set of transmissions from the UE without any gap greater than 16 us. Transmissions from UEs separated by a gap of greater than 16us are considered individual UL transmission bursts. The UE may transmit the transmission after a gap within the UL transmission burst without sensing the availability of the corresponding channel.
4.1.1 Type 1DL channel access procedure
This clause describes a channel access procedure to be performed by the eNB/gNB, wherein the duration spanned by the sensing slots that were sensed as idle prior to downlink transmission is random. This term applies to the following transmissions:
-eNB-initiated transmission containing PDSCH/PDCCH/EPDCCH, or
-Any transmissions initiated by the gNB.
The eNB/gNB may transmit one transmission after first sensing that the channel is idle during the sensing time duration of the deferral duration T d and the counter N is zero in step 4. The counter N is adjusted by sensing the channel for the additional sensing slot duration according to the following steps:
1) Setting n=n init, where N init is a random number uniformly distributed between 0 and CW p, and going to step 4;
2) If N >0 and eNB/gNB chooses to decrement the counter, then n=n-1 is set;
3) Sensing the channel for an additional sensing time slot duration and if the additional sensing time slot duration is idle, going to step 4; otherwise, go to step 5;
4) Stopping if n=0; otherwise, go to step 2.
5) Sensing the channel until a busy sensing time slot is detected within the additional deferral duration T d or all sensing time slots of the additional deferral duration T d are detected as idle;
6) If the channel is sensed to be idle during all sensing time slot durations of the additional deferral duration T d, then go to step 4; otherwise, go to step 5;
The deferred duration T d consists of a duration T f =16 us and an immediately following m p consecutive sense slot durations T sl, and T f includes an idle sense slot duration T sl located at the beginning of T f.
If in the procedure described above the eNB/gNB transmits a discovery burst as described in clause 4.1.2 when N >0, the eNB/gNB should not decrement N during the sensing time slot duration overlapping the discovery burst.
Table 4.1.1-1: channel Access Priority Class (CAPC)
4.1.2 Type 2DL channel access procedure
This clause describes a channel access procedure to be performed by the eNB/gNB, wherein the duration spanned by the sensing slots that were sensed as idle prior to downlink transmission is deterministic.
The type 2A channel access procedure as described in clause 4.1.2.1 applies only to the following transmissions performed by the eNB/gNB:
-after transmission of the UE, transmission of the eNB/gNB after a gap of 25us in shared channel occupancy as described in clause 4.1.3.
The type 2B or type 2C DL channel access procedure as described in clauses 4.1.2.2 and 4.1.2.3, respectively, is suitable for transmission performed by the gNB after transmission by the UE after a gap of 16us or at most 16us, respectively, in shared channel occupation as described in clause 4.1.3.
4.1.2.1 Type 2A DL channel Access procedure
The eNB/gNB may transmit DL transmissions immediately after sensing channel idleness in at least the sensing interval T short_dl =25us. T short_dl consists of a sensing time slot followed by a sensing time slot of duration T f =16us, and T f includes the sensing time slot at the beginning of T f. If both sensing slots of T short_dl are sensed to be idle, then the channel is considered to be idle in T short_dl.
4.1.2.2 Type 2B DL channel Access procedure
The gNB may transmit DL transmissions immediately after sensing that the channel is idle for a duration of T f =16 us. T f contains the sensing time slot that occurs within the last 9us of T f. If the channel is sensed to be idle for a total of at least 5us, where sensing of at least 4us occurs in the sensing time slot, then the channel is considered to be idle for a duration T f.
4.1.2.3 Type 2C DL channel access procedure
When the gNB follows the procedure in this clause for transmitting DL transmissions, the gNB does not sense the channel before transmitting DL transmissions. The duration of the corresponding DL transmission is 584us at most.
4.1.3 DL channel Access procedure in shared channel occupancy
…
If the gNB shares the UE-initiated channel occupancy on the channel using the channel access procedure described in clause 4.2.1.1, then the gNB may transmit a transmission following the UL transmission on the scheduled resource or the PUSCH transmission on the resource configured by the UE after the gap as follows:
The transmission shall contain a transmission to the UE initiating the channel occupancy and may comprise a non-unicast and/or unicast transmission, wherein any unicast transmission comprising user plane data is transmitted only to the UE initiating the channel occupancy.
If the higher layer parameter ul-toDL-COT-SHARINGED-Threshold-r16 is not provided, the transmission shall not include any unicast transmission with user plane data and the transmission duration does not exceed the duration of 2,4 and 8 symbols for the sub-carrier intervals of 15, 30 and 60kHz, respectively, of the corresponding channel.
If the gap is at most 16us, then the gNB may transmit a transmission on the channel after performing a type 2C DL channel access as described in clause 4.1.2.3.
If the gap is 25us or 16us, then the gNB may transmit a transmission on the channel after performing a type 2A or type 2B DL channel access procedure as described in clauses 4.1.2.1 and 4.1.2.2, respectively.
For the case where the gNB shares channel occupancy initiated by a UE with a configured grant PUSCH transmission, the gNB may transmit a transmission following the UE's configured grant PUSCH transmission as follows:
If the higher layer parameter ul-toDL-COT-SHARINGED-Threshold-r16 is provided, then the UE is configured by cg-COT-SHARINGLIST-r16, where cg-COT-SHARINGLIST-r16 provides a table configured by the higher layer. Each row of the table provides channel occupancy Sharing information given by the higher layer parameter CG-COT-Sharing-r 16. One row of the table is configured to indicate that the channel occupancy sharing is not available.
-If the 'COT shared information' in CG-UCI detected in time slot n indicates a row index corresponding to CG-COT-Sharing-r16 providing channel occupancy shared information, gNB may share UE channel occupancy assuming a channel access priority class p= channelAccessPriority-r16, starting with time slot n+o, where o=offset-r 16 time slots for duration d=duration-r 16, where duration-r16, offset-r16 and channelAccessPriority-r16 are higher layer parameters provided by CG-COT-Sharing-r 16.
-If the higher layer parameter ul-toDL-COT-SHARINGED-Threshold-r16 is not provided, and if the 'COT sharing information' in CG-UCI indicates '1', the gNB may share UE channel occupancy and DL transmission X = CG-COT-SharingOffset-r16 symbols starting from the end of the slot in which CG-UCI is detected, where CG-COT-SharingOffset-r16 is provided by the higher layer. The transmission should not include any unicast transmission with user plane data whose transmission duration does not exceed the duration of 2, 4 and 8 symbols for the 15, 30 and 60kHz subcarrier spacing of the corresponding channel, respectively.
For the case where the gNB initiates a transmission using the channel access procedure as described in clause 4.1.1 and shares a corresponding channel occupancy with the UE transmitting the transmission as described in clause 4.2.1.2, the gNB may transmit a transmission following the transmission of the UE within its channel occupancy, provided that any gap between any two of the gNB channel occupancy is at most 25us. The following applies in this case:
if the gap is 25us or 16us, then the gNB may transmit a transmission on the channel after performing a type 2A or 2B DL channel access procedure as described in clauses 4.1.2.1 and 4.1.2.2, respectively.
If the gap is at most 16us, then the gNB may transmit a transmission on the channel after performing a type 2C DL channel access as described in clause 4.1.2.3.
4.2 Uplink channel Access procedure
The UE performing transmission on the LAA Scell, the eNB scheduling or configuring UL transmission for the UE performing transmission on the LAA Scell, and the gNB scheduling or configuring UL transmission for the UE performing transmission on the channel should perform the procedure described in this clause for the UE to access the channel performing transmission.
In this clause, the transmissions from the UE are considered separate UL transmissions, whether or not there is a gap between the transmissions, and X Thresh for sensing is adjusted as described in clause 4.2.3, where applicable.
4.2.1 Channel Access procedure for uplink Transmission
The UE may access the channel performing UL transmissions according to one of the type 1 or type 2UL channel access procedures. The type 1 channel access procedure is described in clause 4.2.1.1. The type 2 channel access procedure is described in clause 4.2.1.2.
If the UL grant scheduling PUSCH transmissions indicates a type 1 channel access procedure, the UE should use the type 1 channel access procedure for transmitting transmissions including PUSCH transmissions, unless otherwise specified in this clause.
The UE shall use the type 1 channel access procedure for transmitting transmissions on the configured UL resources including autonomous or configured grant PUSCH transmissions, unless otherwise specified in this clause.
If the UL grant scheduling PUSCH transmissions indicates a type 2 channel access procedure, the UE shall use the type 2 channel access procedure for transmitting transmissions containing PUSCH transmissions, unless otherwise stated in this clause.
If the UE is scheduled by the gNB to transmit PUSCH and one or more SRS with a single UL grant in a non-contiguous transmission, or the UE is scheduled by the gNB to transmit PUCCH and/or SRS with a single DL assignment in a non-contiguous transmission, the UE should use a channel access procedure indicated by the scheduling DCI for the first UL transmission scheduled by the scheduling DCI. If the UE senses that the channel is continuously idle after the UE has stopped transmitting the first transmission, the UE may transmit other UL transmissions scheduled by the scheduling DCI using a type 2 channel access procedure or a type 2A UL channel access procedure without applying CP extensions, provided that the other UL transmissions are within the gNB channel occupancy time. Otherwise, if the UE senses that the channel is not continuously idle or that the other UL transmissions are outside of the gNB channel occupancy time after the UE has stopped transmitting the first UL transmission, the UE may transmit the other UL transmissions using the type 1 channel access procedure without applying CP extensions.
Table 4.2.1-1: channel access priority class for UL (CAPC)
4.2.1.0.1 Channel access procedure for continuous UL transmission
For continuous UL transmissions, the following applies:
-if the UE is scheduled to transmit a set of UL transmissions using one or more UL grants or DL assignments, and if the UE cannot access channels for transmissions in the set prior to the last transmission according to one of the type 1, type 2 or type 2A UL channel access procedures, the UE shall attempt to transmit the next transmission according to the channel access type indicated in the corresponding UL grant or DL assignment. Otherwise, if the UE cannot access the channels for transmission in the set before the last transmission according to the type 2B UL channel access procedure, the UE should attempt to transmit the next transmission according to the type 2A UL channel access procedure.
-If the UE is scheduled by the gNB to transmit a set of UL transmissions containing PUSCH or SRS symbols using UL grants, the UE should not apply CP extension for the remaining UL transmissions in the set after the first UL transmission after the access channel.
-If the UE is scheduled to transmit a set of consecutive UL transmissions without gaps, comprising PUSCH with one or more UL grants, PUCCH with one or more DL grants, or SRS with one or more DL grants or UL grants, and the UE transmits one of the scheduled UL transmissions in the set after one of the access channels according to type 1, type 2A, type 2B or type 2C UL channel access procedure, the UE may continue the transmission of the remaining UL transmissions (if any) in the set.
-If the UE is configured to transmit a set of consecutive PUSCH or SRS transmissions on resources configured by the gNB, the time domain resource configuration defines a plurality of transmission occasions, and if the UE cannot access the channel according to the type 1UL channel access procedure for transmission in a transmission occasion preceding the last transmission occasion, the UE shall attempt transmission in the next transmission occasion according to the type 1UL channel access procedure. If the UE transmits in one of a plurality of transmission occasions after accessing the channel according to the type 1UL channel access procedure, the UE may continue transmitting in the remaining transmission occasions in the set, wherein each transmission occasion starts at a start symbol of the configured grant PUSCH within the duration of the COT.
-If the UE is configured by the gNB to transmit a set of contiguous UL transmissions without gaps, containing PUSCH, periodic PUCCH or periodic SRS, and the UE transmits one of the configured UL transmissions in the set after accessing the channel according to a type 1UL channel access procedure, the UE may continue the transmission of the remaining UL transmissions (if any) in the set.
4.2.1.1 Type 1UL channel access procedure
This clause describes a channel access procedure for the UE, wherein the duration spanned by the sensing slots that were sensed as idle prior to UL transmission is random. This term applies to the following transmissions:
PUSCH/SRS transmissions scheduled or configured by eNB/gNB, or
PUCCH transmission scheduled or configured by the gNB, or
-A random access procedure related transmission.
The UE may transmit a transmission using the type 1 channel access procedure after first sensing that the channel is idle during the slot duration of the deferral duration T d and after the counter N is zero in step 4. The counter N is adjusted by sensing the channel for the extra slot duration according to the steps described below.
1) Setting n=n init where N init is a random number uniformly distributed between 0 and CW p, and going to step 4;
2) If N >0 and the UE chooses to decrement the counter, then n=n-1 is set;
3) Sensing the channel for an additional time slot duration and if the additional time slot duration is idle, going to step 4; otherwise, go to step 5;
4) Stopping if n=0; otherwise, go to step 2.
5) Sensing the channel until a busy slot is detected within the additional deferral duration T d or all slots of the additional deferral duration T d are detected as idle;
6) If the channel is sensed to be idle during all slot durations of the additional deferral duration T d, then go to step 4; otherwise, go to step 5;
The deferral duration T d consists of a duration T f = 16us followed by m p consecutive slot durations, where each slot duration is T sl = 9us, and T f includes an idle slot duration T sl at the beginning of T f.
4.2.1.2 Type 2UL channel access procedure
This clause describes a channel access procedure to be performed by the UE, wherein the duration spanned by the sensing slots that were sensed as idle prior to UL transmission is deterministic.
If the UE is instructed by the eNB to perform a type 2UL channel access procedure, the UE follows the procedure described in clause 4.2.1.2.1.
4.2.1.2.1 Type 2A UL channel access procedure
If the UE is instructed to perform a type 2A UL channel access procedure, the UE uses the type 2A UL channel access procedure for UL transmission. The UE may transmit a transmission immediately after sensing that the channel is idle in at least the sensing interval T short_ul =25 us. T short_ul consists of a sensing time slot followed by a sensing time slot of duration T f =16us, and T f includes the sensing time slot at the beginning of T f. If both sensing slots of T short_ul are sensed to be idle, then the channel is considered to be idle in T short_ul.
4.2.1.2.2 Type 2B UL channel access procedure
If the UE is instructed to perform a type 2B UL channel access procedure, the UE uses the type 2B UL channel access procedure for UL transmission. The UE may transmit a transmission immediately after sensing that the channel is idle for a duration T f =16 us. T f contains the sensing time slot that occurs within the last 9us of T f. If the channel is sensed to be idle for a total of at least 5us, where sensing of at least 4us occurs in the sensing time slot, then the channel is considered to be idle for a duration T f.
4.2.1.2.3 Type 2C UL channel access procedure
If the UE is instructed to perform a type 2C UL channel access procedure for UL transmission, the UE does not sense the channel prior to transmission. The duration of the corresponding UL transmission is 584us at most.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively, as defined herein
Unlicensed 5G new air interface at [6 ]: in challenges and evaluations (Mohammed Hirzallah, marwan Krunz, balkan Kecicioglu and Belal Hamzeh), reference is made to a brief description of different kinds or types of LBT or channel access procedures.
* And the reference are respectively indicated by the terms "x", "and" y "," and "are used herein to describe both the elements as well as the elements as used herein
LTE-LAA/NR-U based system: to facilitate operation of 5G NR-U (also known as LTE-LAA) on unlicensed bands, four LBT Categories (CAT) are defined:
● CAT1-LBT (type 2C): the gNB can immediately access the channel without performing LBT. COT may be 584 microseconds at most.
● CAT2-LBT (types 2A and 2B): the NR-U device must sense the channel for a fixed duration Tfixed. If the channel remains idle during this period, the device may access the channel. In type 2A Tfixed is 25 microseconds, while in type 2B it is 16 microseconds.
● CAT3-LBT: the NR-U device must back off in a random time period before accessing the channel. This random period is sampled from a fixed-size contention window. The CAT3-LBT option has been excluded from the specification.
● CAT4-LBT (type 1): NR-U devices must back off in an exponential back off according to CSMA/CA procedures
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively, as defined herein
At [7] RP-221938"WID correction: in NR side link evolution "(OPPO), the reasons and goals for performing SL transmissions over unlicensed spectrum are introduced.
* The term "x" and "x" refer to the same or different amounts of a compound as defined herein, i.e., a compound as defined herein
4.1 Targets of SI or core part WI or test part WI
1.…
2. Support of side links on unlicensed spectrum for mode 1 and mode 2 is studied and specified, where Uu operation for mode 1 is limited to licensed spectrum [ RAN1, RAN2, RAN4]
Channel access mechanism from NR-U should be reused for side link unlicensed operation
Analysis of applicability of side link resource reservation from Rel-16/Rel-17 to unlicensed operation of side links within boundaries of unlicensed channel access mechanisms and operations
■ No specific enhancements to the Rel-17 resource allocation mechanism
■ If the existing NR-U channel access framework does not support the required SL-U functionality, then the WG will make appropriate recommendations for RAN approval.
-A physical channel design framework: necessary changes to the NR side-chain physical channel structure and procedure to operate on unlicensed spectrum
The existing NR side link and NR-U channel structure will be reused as a baseline.
No specific enhancement to existing NR SL characteristics
Research should be focused on the FR1 unlicensed band (n 46 and n96/n 102) and will be done by RAN # 98.
-Annotating: in side-link unlicensed operation, the gNB does not perform type 1 channel access to initiate and share channel occupancy, does not perform type 2 channel access to share the initiated channel occupancy, and does not perform semi-static channel access procedures to access unlicensed channels.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", "7" and "x", "as defined herein, respectively
In rans1#110 ([ 8]3GPP TSG RAN WG1#110, RAN1 chairman note) protocols are provided for side links on unlicensed spectrum.
* And the reference are the same, and the reference are the same
Protocol(s)
● Type 2A/2B/2C SL channel access procedure
The type 2A channel access procedure applies to the following cases:
■ Within a gap of 25 μs or more in shared channel occupation, the transmission of a UE follows the transmission of another UE
■ Any other transmissions by the UE are to be further investigated (e.g. except for COT sharing)
■ Whether type 2A is also used for short control signaling situations is to be investigated further
The type 2B channel access procedure applies to the following cases:
■ At least when the gap is 16 mus in the shared channel occupancy, the transmission of the UE follows the transmission of another UE
■ The situation when the gap is between 16 and 25us is to be further investigated
■ Any other transmissions by the UE are to be further investigated (e.g. except for COT sharing)
The type-2C channel access procedure applies to the following cases:
■ The transmission of a UE follows the transmission of another UE within a gap of 16 mus or less in shared channel occupancy, and the duration of the corresponding transmission is at most 584us.
■ Any other transmissions by the UE are to be further investigated (e.g. except for COT sharing)
■ Whether type 2C is also used for short control signaling situations is to be investigated further
Under which conditions (except for gaps) the UE may apply type 2A/2B/2C SL channel access procedures to be studied further
Under which conditions type 2B or type 2C was applied with a gap of 16. Mu.s to be studied further
Protocol(s)
Mode 1 and mode 2 resource allocation for SL-U supports multiple contiguous slot transmission (MCSt).
● Details are to be further studied
Protocol(s)
For PSCCH and PSSCH in SL-U:
● Support for R16/R17 NR SL similar to R16 NR-U for contiguous RB based transmission and for interleaved RB based transmission
Protocol(s)
Indication of PSCCH and PSSCH resources in the time/frequency domain
● For the time domain: r16 NR SL TRIV re-use as baseline
● For the frequency domain:
Further study of subchannel index and resource indication
● To be studied further: if new features are introduced in the SL-U, such as multi-slot successive transmissions, then whether any enhancements to R16 NR SL TRIV/FRIV are required
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively, as defined herein
In RAN1#110bis-e ([ 9]3GPP TSG RAN WG1#110bis-e RAN1 chairman note), a protocol is provided for side links over unlicensed spectrum.
* And the reference are the same, and the reference are the same
Protocol(s)
Type 1SL channel access procedure is applicable to the following transmissions by the UE:
PSSCH/PSCCH transmissions scheduled or configured by the gNB in SL mode 1 resource allocation.
PSSCH/PSCCH transmission from UE in SL mode 2 resource allocation.
Other SL transmissions, including S-SSB and PSFCH transmissions from UE
-To be studied further: how to set CAPC for S-SSB and PSFCH
-Annotating: type 1 may be used to initiate COT
The UE uses a channel access priority class adapted for side-link user plane data multiplexed in the PSSCH for performing a type 1 channel access procedure for transmitting transmissions containing the PSSCH with user plane data and its associated PSCCH.
-Annotating: how CAPC to set the MAC CE for multiplexing in the PSSCH depends on RAN2
The UE should not transmit on the channel in a channel occupancy time exceeding the maximum COT duration, wherein the channel access procedure is performed based on the channel access priority class p associated with the UE transmission, as given in the CAPC table for SL.
Protocol(s)
With respect to support for MCSt operation in SL-U, the following options will be further investigated and one or more of the following options will be selected in future conferences.
When L1 is triggered for reporting a candidate resource subset for MCSt,
-Option 1: only one set of parameters (prio TX, remaining PDB, L subCH and P rsvp_TX) is provided for the resource selection procedure in L1.
Note that this applies to the transmission of single and multiple TBs
-To be studied further: this is the same or different from Rel-16
-Option 2: providing one or more parameter sets (prio TX, remaining PDB, L subCH, and P rsvp_TX) for resource selection procedures in L1
-To be studied further: any other information is required to be provided to L1 for use in MCSt
When L1 reports a candidate resource subset for MCSt,
-Option a: candidate multislot resources in L1 report S A, where the candidate multislot resources consist of a set of single-slot resources that are consecutive in time
Whether a set of single-slot resources within the candidate multislot resources may have different L subCH sizes to be further investigated
-Option B: l1 reports (S A) candidate single slot resources in as in Rel-16
-Selecting by a higher (MAC) layer a set of single-slot resources consecutive in a logical slot
-Option C: consecutive single slot candidate resources in L1 report S A
Whether consecutive single-slot candidate resources may have different L subCH sizes to be studied further
-To be studied further: any other information is required to report to the MAC layer, provided to L1 or for MCSt
-To be studied further: whether/how to consider extra LBT time in SL resource allocation
Protocol(s)
For dynamic channel access mode with multi-channel conditions in SL-U, NR-U UL channel access procedures are considered to be baseline for transmissions on multiple channels
-To be studied further: whether transmission of S-SSB on subset of PSFCH and/or RB set is supported (using NR-U DL channel Access procedure as baseline)
Any necessary enhancements and modifications for SL-U operation are to be investigated further
Protocol(s)
In a type 1SL channel access procedure, the following table is used for the channel access priority class of SL (CAPC).
-To be studied further: suitability and use of note 1 in the table
-To be studied further: whether mp=1 can be used with p=1, and where applicable
Protocol(s)
For PSCCH and PSSCH in SL-U:
PSCCH transmission within 1 sub-channel
Support at least the lower option 1
-Option 1: PSCCH is positioned in the lowest sub-channel of the lowest RB set corresponding to PSSCH
-Annotating: the lowest sub-channel may not be fully contained in the lowest RB set
Whether/how to handle the case where UEs supporting different bandwidths can communicate with each other using the same resource pool, e.g. whether/how to additionally support the following option 2 to be studied further
-Option 2: PSCCH is positioned in each RB set of the corresponding PSSCH
-Annotating: the above options do not imply any limitation on the mapping of subchannels to PRBs.
Other details remain to be studied further.
* The term "x" and "x" refer to the same or different terms, including "x" and "x", as defined herein, respectively, as defined herein
In New Radio (NR) Rel-16, which is the first version of NR side link internet of vehicles (V2X), the current standard has met the requirements as defined in SA 1. Considering the future, as more and more devices require higher throughput and higher data rates, side link transmission over wider frequency resources may be required. However, the current frequency band supporting PC5 interface or side-link transfer may be inadequate. Thus, introducing side link transmission over unlicensed/shared spectrum under large spectrum availability may be a targeted solution. Listen Before Talk (LBT) may be required for fair coexistence with other devices in the same or different RATs or different technologies in the unlicensed spectrum (e.g., wiFi). LBT is an energy detection or sensing technique based on the LBT result (free or busy) before transmission, and a device can determine whether transmission is allowed. In [5]3GPP TS 37.213 V16.6.0 (2021-06) and [6] unlicensed 5G new radios: in the challenge and evaluation, unlicensed new radios for the Uu interface are briefly introduced. LBT can be simply divided into short LBT (e.g., CAT1-LBT and CAT 2-LBT) and long LBT (e.g., CAT 4-LBT). For short LBT, the device may be allowed to perform a transmission without LBT or perform a relatively short LBT; while for long LBT, the device may need to perform transmission with LBT with a relatively longer time (e.g., with more sensing slots idle and preferably with backoff). The long LBT corresponds to a type 1 channel access procedure in TS 37.213 and the short LBT corresponds to a type 2/2A/2B/2C channel access procedure in TS 37.213. However, for side link reception, continuously monitoring or receiving or detecting side link resources may be one assumption in a side link device.
For the NR version 16/17 side link design, side link slots may be used for physical side link broadcast channel (PSBCH) or physical side link control channel (PSCCH)/physical side link shared channel (PSSCH)/physical side link feedback channel (PSFCH) transmission/reception. Furthermore, the concept of a side link resource pool for side link communication is used for PSCCH/PSSCH and/or PSFCH transmit/receive. The side link (communication) resource pool will include a set of side link slots (except for the slots for the PSBCH) and a set of frequency resources. The different pools of side link (communication) resources may be Time Division Multiplexed (TDM) and/or Frequency Division Multiplexed (FDM). More specifically, the PSCCH in one side link (communication) resource pool may schedule only the PSSCH resources in the same side link (communication) resource pool. The PSCCH in one side (communication) resource pool is not capable of scheduling the PSCCH resources in the other/other side (communication) resource pool. For PSCCH/PSSCH, the associations PSFCH are in the same side link (communication) resource pool, rather than in different side link (communication) resource pools.
One side chain (communication) resource pool will comprise a plurality of sub-channels in the frequency domain, wherein a sub-channel comprises a plurality of contiguous Physical Resource Blocks (PRBs) in the frequency domain. One PRB includes a plurality of Resource Elements (REs), for example, one PRB is composed of 12 REs. The configuration of the side link resource pool will indicate the number of PRBs for each subchannel in the corresponding side link resource pool. Sub-channel based resource allocation in the frequency domain is supported for the PSSCH. For the PSCCH resources scheduled by a PSCCH in the same side-link slot, a fixed relationship between PSCCH and PSCCH resources is specified, meaning that the PSCCH will be located in the lowest (index) subchannel of the scheduled PSCCH resource. For the scheduled PSSCH resources in different slots, the starting frequency position of the scheduled PSSCH resource will be scheduled/indicated by the sidelink control information rather than a fixed relation.
In the current NR version 16/17 side link design, one side link control information (SCI) may indicate up to three PSSCH resources via frequency resource assignments and/or time resource assignments in the SCI. The SCIs may include a level 1 SCI and a level 2 SCI. The level 1 SCI may be transmitted via the PSCCH. The level 2 SCI may be transmitted via multiplexing with a scheduled PSSCH resource in the same side link slot, such as a first PSSCH resource. In other words, the SCI may schedule up to two PSSCH resources, e.g., a second PSSCH resource and/or a third PSSCH resource, in a later side link slot. The up to three PSSCH resources are in different slots in a side link (communication) resource pool. The up to three PSSCH resources are within 32 consecutive slots in the sidelink resource pool. The up to three PSSCH resources are used/associated with the same data packet, such as the same Transport Block (TB) or the same Media Access Control (MAC) Protocol Data Unit (PDU).
When a Receiving (RX) User Equipment (UE) receives the one SCI in a particular time slot, the particular time slot will be a reference time slot or a first time slot for determining the 32 consecutive time slots in a side link (communication) resource pool. The first PSSCH resource is in the particular slot in which the one SCI is received. The starting subchannel for the first PSSCH resource is the subchannel in which the PSCCH is received. The time resource assignment in SCI will indicate a Time Resource Indicator Value (TRIV).
Furthermore, resource reservation for another TB through SCI may be (pre) configured by enabling or not configuring in a side link (communication) resource pool. When the side link (communication) resource pool is configured with an enabled resource reservation, the side link (communication) resource pool is configured with a set of reservation period values. Possible reservation periods may be 0, 1:99, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000ms. The resource reservation period field in the SCI in the sidelink (communication) resource pool may indicate which reservation period value is used for (future) resource reservation. The size/number of reserved period value sets may be from 1 to 16.
In the current NR version 16/17 side link design, two side link resource allocation patterns are defined for NR side link communication:
Mode 1 is that the base station/network node may schedule side link resources for the UE to use for side link transmission;
Mode 2 is the UE determining (i.e. the base station/network node does not schedule) side link resources configured by the base station/network node or side link transport resources within pre-configured side link resources.
For a UE (autonomous) selection mode, e.g. NR side link resource allocation mode 2, since the transmission resources are not scheduled via the network node, the UE may need to perform sensing before selecting resources for transmission (e.g. a sensing based transmission) to avoid collisions and interference with other UEs, in particular UEs using Long Term Evolution (LTE)/NR side links. Full sensing is supported in the NR Rel-16 side link and partial sensing is supported in the NR Rel-17 side link. Based on the result of the sensing procedure, the physical layer (L1) of the UE may determine a valid/identified set of resources. The valid/identified set of resources may be reported to a higher layer (media access control (MAC) layer) of the UE. The higher layer (MAC layer) of the UE may (randomly) select one or more valid/identified resources from the set of valid/identified resources to perform side-link transmission from the UE. The side link transmissions from the UE may be PSCCH and/or PSSCH transmissions.
As an example shown in fig. 5, when triggering/requesting a sensing-based resource selection in slot n, the (physical layer of the) UE will have a (initial) candidate set of single-slot resources comprising a plurality of candidate single-slot resources. The set of available (initial) candidate single-slot resources is limited by a time interval n + T 1,n+T2, which may be referred to as a resource selection window. Preferably, in some embodiments, one candidate single-slot resource may comprise one or more frequency resource units within one slot, wherein the frequency resource units may be subchannels. As specified in TS 38.214[2]3GPP TS 38.214 V17.1.0 (2022-03), the candidate single slot resources for transmitting R x,y are defined as being in slotsL subCH contiguous subchannels having subchannel x+j, where j=0.
If full sensing is performed (e.g., [2]3GPP TS 38.214 V17.1.0 (2022-03)), e.g., partial sensing is not configured, then the (initial) candidate set of single-slot resources is in the (full) time interval [ n+t 1,n+T2 ]. The (physical layer of the) UE should be in the sensing windowAn inner monitoring/sensing time slot.
Based on the sensing result, (physical layer of) the UE may generate a valid/identified set of resources, wherein the valid/identified set of resources is a subset of the (initial) candidate set of single-slot resources. The generation of valid/identified sets of resources may be performed via excluding some candidate single-slot resources from the (initial) set of candidate single-slot resources, e.g. step 1 and step 2 shown in fig. 5. If the remaining candidate single-slot resources after the excluding step are less than X (e.g. any of 20%, 35%, 50% depending on prio TX, the association being configured in the side link resource pool configuration) of the number of (initial) candidate single-slot resource sets, the UE may re-perform the excluding step by increasing the power threshold by 3 dB. Subsequently, (the physical layer of) the UE may determine a valid/identified set of resources. The resource selection for side link transmission performed by the higher layer (MAC layer) of the UE may be randomly selected from a valid/identified set of resources, e.g., step 3 shown in fig. 5.
As specified in [2]3GPP TS 38.214 V17.1.0 (2022-03), the first exclusion step is if (the physical layer of) the UE does not monitor/sense the Transmission Time Interval (TTI) z, then (the physical layer of) the UE cannot expect whether the candidate single-slot resources in TTI "z+p any" are occupied, where P any represents any possible periodicity configured in the side link (communication) resource pool. For example, the first exclusion step is shown as step 1 in fig. 5. The (physical layer of the) UE excludes candidate single-slot resources in TTI "z+q·p any", and excludes other UEs that may have candidate single-slot resources for possible transmissions occurring in TTI "z+q·p any", where q is 1 or 1,2, …,The parameter q means that the UE excludes multiple candidate single-slot resources with period P rsvp_RX for the time interval z, z+t scal.
The second excluding step is that if (the physical layer of) the UE receives/detects side link control signaling (e.g., SCI format 1) in TTI m, the (physical layer of) the UE may exclude candidate single slot resources according to the received side link control signaling. For example, the second exclusion step is shown as step 2 in fig. 5. More specifically, if (the physical layer of) the UE receives/detects the side link control signaling of the scheduled transmission in TTI m and the measurement result for the side link control signaling is higher than the power threshold, the (physical layer of) the UE may exclude candidate single-slot resources according to the received side link control signaling. The measurement may be a reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP). More specifically, the measurement result may be PSCCH-RSRP or PSSCH-RSRP. The sidelink control signaling may schedule/indicate resources of the scheduled transmission and/or the periodicity P rsvp_RX of the scheduled transmission. The candidate single-slot resources excluded from the received side-link control signaling are based on the resources of the scheduled transmission and/or the resources of the periodic next scheduled transmission or transmissions. Next, the plurality of scheduled transmissions may have a period P rsvp_RX within a time interval z, z+t scal. The power threshold is determined based on prio RX (a priority value indicated by the received side link control signaling) and prio TX (a priority value provided by higher layers of the UE). The association between the power threshold and (prio RX,prioTX) is configured by higher layers (e.g., configuration of side link (communication) resource pools).
Regarding side link transmissions on the unlicensed/shared spectrum, a Transmitting (TX) UE may need to perform a Side Link (SL) channel access procedure for subsequent side link transmissions from the TX UE. A SL channel access procedure is performed for occupying the channel. When/if the TX UE does not pass LBT for initiating a Channel Occupancy Time (COT) (e.g., by a type 1SL channel access procedure) or sharing/utilizing COT (e.g., by a type 2A/2B/2C SL channel access procedure), the TX UE may not be able to perform subsequent side link transmissions. The TX UE may be able to perform subsequent side link transmissions when/if the TX UE passes LBT for initiating COT (e.g., via a type 1SL channel access procedure) or sharing/utilizing COT (e.g., via a type 2A/2B/2C SL channel access procedure). Furthermore, any time gap between subsequent sidelink transmissions may give rise to some opportunities for other Radio Access Technologies (RATs) or UEs to occupy the channel, which gives rise to TX UEs that may not be able to continue with their own sidelink transmissions. Thus, support for multiple contiguous slot transfer (MCSt) is agreed for mode 1 and mode 2 resource allocation in SL-U (e.g., [8]3GPP TSG RAN WG1#110 RAN1 chairman note).
Regarding support for MCSt operation in mode 2, it is used for TX UE implementation to select multiple side-link resources in multiple consecutive slots, which may mitigate the effects of channel disruption due to other RATs or UEs. Multiple contiguous time slots may mean at least multiple contiguous side link time slots. More strictly, a multi-contiguous time slot may mean a multi-contiguous physical time slot. The multiple contiguous physical time slots will be contiguous in the time domain. In a RANs 1#110bis-e conference (e.g., [9]3GPP TSG RAN WG1#110bis-e RAN1 chairman note), one or more of the following options are to be studied further to support MCSt operation in SL-U mode 2 (note that other options are not excluded):
When L1 is triggered for reporting a candidate resource subset for MCSt,
-Option 1: only one set of parameters (prio TX, residual Packet Delay Budget (PDB), L subCH and P rsvp_TX) is provided for the resource selection procedure in L1.
Note that this applies to the transmission of single TBs and multiple TBs.
-To be studied further: this is the same or different from Rel-16.
-Option 2: one or more parameter sets (prio TX, remaining PDB, L subCH, and P rsvp_TX) are used for the resource selection procedure in L1.
When L1 reports a candidate resource subset for MCSt,
-Option a: the L1 reports the candidate multislot resources in S A, where the candidate multislot resources consist of a set of single-slot resources that are consecutive in time.
Whether the set of single-slot resources within the candidate multislot resources to be further investigated (to be further investigated) may have different L subCH sizes.
-Option B: l1 reports (S A) candidate single slot resources in as in Rel-16
-Selecting, by a higher (MAC) layer, a set of single-slot resources consecutive in a logical slot.
-Option C: consecutive single slot candidate resources in L1 report S A
Whether consecutive single-slot candidate resources may have different L subCH sizes to be further investigated.
In option a, the physical layer of the TX UE may design/consider the candidate multislot resources as a set of multiple candidate single-slot resources that are contiguous in multiple contiguous slots. Each of the plurality of candidate single-slot resources for the candidate multi-slot resource may include the same or different numbers of subchannels. The physical layer of the TX UE may perform resource exclusion in units of candidate multislot resources and then report valid/identified candidate multislot resources to higher layers of the TX UE. One problem is how the physical layer of the TX UE determines the number of multiple candidate single-slot resources or the number of multiple consecutive slots for one candidate multi-slot resource, denoted as L MCSt. Another issue is how to label/define candidate multi-slot resources, where one point of interest is that each of the plurality of candidate single-slot resources for the candidate multi-slot resource may include a different number of subchannels, and another point of interest is that each of the plurality of candidate single-slot resources for the candidate multi-slot resource may be associated with the same or different starting subchannel index (even with the same number of subchannels). The labeling/definition of candidate multislot resources may involve counting the number of candidate multislot resources and/or also ending conditions for resource exclusion (meeting ≡x·m Total number of ). The exhaustive approach would be quite complex and inefficient, as the complexity and corresponding number/count would be greatly increased for increasing L MCSt.
In order to address the above-described issues with respect to MCSt in mode 2, some concepts, mechanisms, methods, and/or embodiments are provided in the following disclosure.
In the first time slot n, (the physical layer of) the TX UE may trigger/request or be triggered/requested to (re) select based on the sensed resources for performing PSSCH/PSCCH transmission in a side link resource pool in the unlicensed/shared spectrum. The PSSCH/PSCCH transmission may be used to transmit the sidelink data packet to at least the first RX UE associated with the first destination identity. Preferably in some embodiments (the physical layer of) the TX UE may trigger/request or be triggered/requested to determine a side link resource subset from which the higher layer of the TX UE will select side link resources for PSSCH/PSCCH transmission. Preferably in some embodiments (the physical layer of) the TX UE may determine and report the side chain resource subset to the higher layer of the TX UE. The higher layer of the TX UE will select the side link resources for PSSCH/PSCCH transmission from the side link resource subset. The higher layers of the TX UE may provide any parameter from which information of the side chain resource pool of side chain resources is to be reported, priority (labeled prio TX), remaining Packet Delay Budget (PDB), number of subchannels to be used for PSSCH/PSCCH transmission in a slot (labeled L subCH), or resource reservation interval (labeled P rsvp_RX)
Concept A
For MCSt operation, (the physical layer of) the TX UE may determine/derive/obtain/have a first parameter (denoted as L MCSt). The (physical layer of the) TX UE may determine the side link resource subset based on the first parameter.
Preferably in some embodiments, the first parameter may be associated with more than one value to derive/determine/set the effective/possible/allowed length of consecutive time slots (e.g., (1) two values for indicating upper and lower boundaries of a range of lengths or for indicating a start value plus a length value, or (2) two or three values directly indicating different lengths, or (3) one value is derived/selected/determined from the more than one value).
Preferably, in some embodiments, the first parameter (L MCSt) may be used to determine/set/initialize candidate multislot resources. Preferably in some embodiments, each candidate multislot resource comprises or consists of L MCSt candidate single slot resources that are contiguous in time. The L MCSt candidate single-slot resources of one candidate multislot resource are separated/distributed among the L MCSt consecutive slots. Preferably, in some embodiments, the L MCSt candidate single-slot resources of the one candidate multi-slot resource may include the same frequency resource (e.g., include the same subchannel, or include the same starting subchannel and the same number/length of subchannels). Preferably and/or alternatively, the L MCSt candidate single-slot resources of the one candidate multi-slot resource may comprise the same or different frequency resources (e.g. comprise the same or different sub-channels). Preferably, in some embodiments, the different candidate multislot resources may comprise the same or different candidate single slot resources. The (physical layer of the) TX UE may exclude some candidate multislot resources based on the received SCI and/or non-monitored slots. For example, if/when part or all of a particular candidate single-slot resource is indicated as reserved by other UEs, the (physical layer of the) TX UE may exclude some candidate multi-slot resources, wherein some candidate multi-slot resources that are excluded include the particular single-slot resource. Preferably in some embodiments (the physical layer of) the TX UE may report the remaining candidate multislot resources after the exclusion step/operation based on the received SCI and/or non-monitored time slots. For example, as shown in fig. 6, a gray block may mean that side link resources are not reserved/scheduled/allocated by other UEs or are not excluded in the excluding step/operation. Assuming that L subCH =3 and L MCSt =3, the candidate multi-slot resource R (x1,x2,x3),y can be defined as L MCSt =3 candidate single-slot resources, which are included in the slotsFirst set of L subCH contiguous subchannels with subchannel x1+j in slot/>A second set of L subCH contiguous subchannels with subchannel x2+ j in the slot/>A third set of L subCH contiguous subchannels having subchannels x3+j, where j=0. The physical layer of the TX UE may report the valid/identified candidate multislot resources including R (x+a,x+b,x+c),y+5, where a=3-7, b=0, 1,6, c=3-5. The physical layer of the TX UE may report the valid/identified candidate multislot resources including R (x+a,x+b,x+c),y+6, where a=0, 1,6, b=3-5, c=1.
Preferably and/or alternatively, the first parameter (L MCSt) may be used to exclude candidate single-slot resources that are not contiguous in time. Preferably, in some embodiments, the first parameter (L MCSt) may be used to exclude candidate single-slot resources that are discontinuous in L MCSt consecutive slots. Preferably, in some embodiments, the first parameter (L MCSt) may be used to exclude candidate single-slot resources in some candidate slots. Preferably in some embodiments, after the TX UE excludes the candidate single-slot resources based on the received SCI and/or non-monitored slots, the TX UE excludes the candidate single-slot resources in some of the candidate slots based on a first parameter (L MCSt). Preferably in some embodiments, when/after the TX UE determines/derives valid/identified candidate single-slot resources from (based on its exclusion from) the received SCI and/or non-monitored slots, the TX UE (checks the continuity of valid/identified candidate single-slot resources and) excludes valid/identified candidate single-slot resources from some candidate slots based on a first parameter (L MCSt). Preferably in some embodiments, some of the candidate slots are discontinuous in time. Preferably and/or alternatively, some candidate slots have a continuity less than/less than L MCSt. Preferably in some embodiments, the subset of side link resources reported to the higher layers of the TX UE does not include (valid/identified) candidate single-slot resources in some candidate slots. For the example shown in FIG. 6, if L MCSt is 3, then the slots are excludedIn (c) because of the slot/>, the active/identified candidate single slot resourcesDiscontinuous with other candidate slots having valid/identified candidate single-slot resources. Exclusion of time slots/>And/>In (c) because of the slot/>, the active/identified candidate single slot resourcesAnd/>Is 2 (the two consecutive slots are not consecutive to other candidate slots with valid/identified candidate single-slot resources).
Preferably and/or alternatively, the first parameter (L MCSt) may be used to not report (to a higher layer of the TX UE) candidate single-slot resources that are not contiguous in time. Preferably, in some embodiments, the first parameter (L MCSt) may be used to not report (to the higher layer of the TX UE) candidate single-slot resources that are not contiguous in L MCSt contiguous slots. Preferably, in some embodiments, the first parameter (L MCSt) may be used to not report (to a higher layer of the TX UE) candidate single-slot resources in some candidate slots. Preferably in some embodiments, after the TX UE excludes the candidate single-slot resources based on the received SCI and/or non-monitored slots, the TX UE does not report (to a higher layer of the TX UE) the candidate single-slot resources in some of the candidate slots based on the first parameter (L MCSt). Preferably in some embodiments, when/after the TX UE determines/derives valid/identified candidate single-slot resources from (based on its exclusion of) the received SCI and/or non-monitored slots, the TX UE (checks the continuity of the valid/identified candidate single-slot resources and) does not report (to the higher layer of the TX UE) the valid/identified candidate single-slot resources in some of the candidate slots based on the first parameter (L MCSt). Preferably in some embodiments, some of the candidate slots are discontinuous in time. Preferably and/or alternatively, some candidate slots have a continuity less than/less than L MCSt. Preferably in some embodiments, the subset of side link resources reported to the higher layers of the TX UE does not include (valid/identified) candidate single-slot resources in some candidate slots. For the example shown in fig. 6, if L MCSt is 3, the slot is not reported to the higher layer of the TX UEIn (c) because of the slot/>, the active/identified candidate single slot resourcesDiscontinuous with other candidate slots having valid/identified candidate single-slot resources. Reporting no slot/>, to higher layers of TX UEAnd/>In (c) because of the slot/>, the active/identified candidate single slot resourcesAnd/>Is 2 (the two consecutive slots are not consecutive to other candidate slots with valid/identified candidate single-slot resources).
In one embodiment, the higher layer (e.g., MAC layer) of the TX UE may provide the first parameter to (the physical layer of) the TX UE, e.g., when the higher layer (e.g., MAC layer) of the TX UE triggers/requests the (physical layer of) the TX UE to determine the subset of side chain resources. Preferably, in some embodiments, a higher layer (e.g., MAC layer) of the TX UE may determine the first parameter based on a configuration associated with the side link logical channel, wherein the side link data packet includes side link data from the side link logical channel. Preferably, in some embodiments, a higher layer (e.g., MAC layer) of the TX UE may determine the first parameter based on the MAC CE, wherein the side link data packet includes the MAC CE. Preferably in some embodiments, the higher layer (e.g., MAC layer) of the TX UE may determine the first parameter based on the (expected) number of PSCCH/PSSCH transmissions used to transmit the side link data packets. Preferably in some embodiments the (intended) number of PSCCH/PSSCH transmissions may comprise/mean PSCCH/PSSCH retransmissions for the side link data packets. Preferably and/or alternatively, the (intended) number of PSCCH/PSSCH transmissions may comprise/mean PSCCH/PSSCH initial transmissions and retransmissions for the side link data packets. Preferably in some embodiments, the higher layer (e.g. MAC layer) of the TX UE may determine the first parameter based on the number/amount of (pending) side link packets, which PSSCH/PSCCH transmissions may be used to transmit.
In one embodiment, the first parameter may be configured in a configuration of a side chain resource pool. Preferably in some embodiments, the first parameter may be configured in a configuration of a side link resource pool supporting/enabling a multi-contiguous slot transport operation.
In one embodiment, the first parameter may be configured in a side link connection configuration. The side link connection may be associated with a destination (identity). Preferably in some embodiments, the first parameter may be determined/derived based on a configuration of the side link connection associated with the first destination identity. The side link connection may be used for unicast or multicast.
In one embodiment, the first parameter may be determined/derived based on priority (prio TX) and/or remaining Packet Delay Budget (PDB). Preferably in some embodiments the mapping/association between the first parameter and the priority may be configured, for example in the configuration of the side link resource pool or in the configuration of the side link connection. Preferably in some embodiments, the mapping/association between the first parameter and the remaining PDBs may be configured, for example in the configuration of the side link resource pool or in the configuration of the side link connection.
In one embodiment, the first parameter may be determined/derived based on a Channel Access Priority Class (CAPC). Preferably in some embodiments, CAPC may be determined/derived based on priority (prio TX). Preferably in some embodiments, the mapping/association between the first parameter and CAPC may be configured, for example in the configuration of a side link resource pool or in the configuration of a side link connection. Preferably in some embodiments, the higher layer (e.g., MAC layer) of the TX UE may provide CAPC to (the physical layer of) the TX UE, e.g., when the higher layer (e.g., MAC layer) of the TX UE triggers/requests the (physical layer of) the TX UE to determine the subset of side chain resources.
In one embodiment, the first parameter may be determined/derived based on (the duration of) the COT duration. The COT duration may be determined/derived based on CAPC. The COT duration may be initialized by the TX UE. Preferably in some embodiments, the mapping/association between the first parameter and (the duration of) the COT duration may be configured, e.g. in the configuration of the side link resource pool or in the configuration of the side link connection. Preferably in some embodiments the first parameter may be determined/derived as the number of time slots of (the duration of) the COT duration. The motivation is not to allow TX UEs to perform side link transmissions outside the COT duration. Preferably and/or alternatively, the first parameter may be determined/derived as the offset plus the number of time slots of (the duration of) the COT duration. The offset may be configured or specified or determined by the TX UE itself. The motivation for the offset is to consider the possibility of LBT failure such that the TX UE may not be able to use all selected side link resources for performing PSSCH/PSCCH transmissions.
In one embodiment, the first parameter may be determined/derived based on (the duration of) the remaining shared COT duration. Preferably in some embodiments, the shared COT may be shared by other UEs. Preferably in some embodiments, the mapping/association between the first parameter and (the duration of) the remaining shared COT duration may be configured, e.g. in the configuration of the side link resource pool or in the configuration of the side link connection. Preferably in some embodiments the first parameter may be determined/derived as the number of time slots of (the duration of) the remaining shared COT duration. The motivation is not to allow TX UEs to perform side link transmissions outside the shared COT duration.
In one embodiment, the first parameter may be determined/derived based on a Channel Busy Ratio (CBR) of the side link resource pool. Preferably in some embodiments, the mapping/association between the first parameter and CBR may be configured, for example in the configuration of a side link resource pool. The motivation is that when CBR is high (e.g., the channel is too congested), the TX UE is not allowed to occupy the side link resources too long in time.
In one embodiment, the (physical layer of the) TX UE may determine/derive a first parameter value (e.g., from a number of configured/available/specified values) based on the sensing result. Preferably in some embodiments, the (physical layer of the) TX UE may determine/derive the first parameter (e.g. from several configured/available/specified values for the first parameter) based on the remaining candidate single-slot resources after the excluding step/operation based on the received SCI and/or non-monitored slots. Preferably in some embodiments, the (physical layer of the) TX UE may determine/derive the first parameter (e.g. from several configured/available/specified values for the first parameter) based on the continuity of the remaining candidate single-slot resources after the excluding step/operation. Preferably in some embodiments (the physical layer of) the TX UE may determine/derive a first parameter that may satisfy the condition check in concept D. Preferably in some embodiments, (the physical layer of) the TX UE may determine/derive a maximum/maximum value (e.g. from several configured/available/specified values) as a first parameter, which may satisfy a condition check that the number of remaining candidate (single-slot or multi-slot) resources after the excluding step is not less than x·m Total number of . Preferably and/or alternatively, (the physical layer of) the TX UE may determine/derive a maximum/maximum value (e.g. from several configured/available/specified values) as a first parameter, which may satisfy the condition check in concept D.
Preferably in some embodiments, the (physical layer of the) TX UE may not determine/derive the first parameter if/when the MCSt operation is not applied/performed. The (physical layer of the) TX UE may determine the side chain resource subset without being based on the first parameter.
Preferably, in some embodiments, the first signal is transmitted to the TX UE based on the presence or provision of the first parameter to the TX UE, or the first parameter having L MCSt greater than 1,
-Applying/executing MCSt operations, and/or
-Performing/applying an exclusion of candidate single-slot resources (discontinuous in time), and/or
Non-reporting of candidate single-slot resources (discontinuous in time).
Preferably, in some embodiments, the first parameter is based on the absence or absence of being provided to the TX UE, or the first parameter having L MCSt as 1 (if the first parameter is present or provided to the TX UE),
-Not applying/executing MCSt operations, and/or
-Not performing/applying exclusion of candidate single-slot resources (discontinuous in time), and/or
Report candidate single-slot resources (contiguous or non-contiguous in time).
For MCSt operation, (the physical layer of) the TX UE may exclude some candidate side link resources based on certain conditions. Preferably in some embodiments (the physical layer of) the TX UE may not report some (valid/identified) candidate side link resources to higher layers of the TX UE based on certain conditions. Preferably, in some embodiments, higher layers of the TX UE may prevent/exclude/avoid/exclude selecting some (valid/identified) candidate side link resources based on certain conditions. Preferably, in some embodiments, some (valid/identified) candidate side link resources may mean/be some (valid/identified) candidate single slot resources. Preferably and/or alternatively, some (valid/identified) candidate side link resources may mean/be some (valid/identified) candidate multislot resources, e.g. as described in concept a.
In one embodiment, the specific condition may be to guarantee/ensure that a blank channel is utilized for performing PSSCH/PSCCH transmissions. Preferably in some embodiments, the specific condition may be that the (valid/identified) candidate side link resources are in the same set of Resource Blocks (RBs) in the side link resource pool. Preferably and/or alternatively, the specific condition may be that the (valid/identified) candidate side link resources are in the same set of one or more RBs in the side link resource pool. Preferably in some embodiments, the set of occupied RBs cannot be increased for the set of (active/identified) candidate side link resources selected/determined by the higher layer (MAC layer) of the TX UE. More specifically, the set of (valid/identified) candidate side link resources selected/determined by the higher layer (MAC layer) of the TX UE includes a first candidate side link resource in a first time slot and a second candidate side link resource in a second time slot, wherein the second time slot is later in time than the first time slot. The first candidate side link resource occupies a first one or more RB sets and the second candidate side link resource occupies a second one or more RB sets. The specific condition may be that the first one or more RB sets include the second one or more RB sets (in the frequency domain). The particular condition may be that the second one or more RB sets are not allowed to include any RB sets outside (in the frequency domain) of the first one or more RB sets.
Preferably in some embodiments the total number of (initialized) candidate multislot resources (before the excluding step) may be denoted as M multi-total. The (physical layer of the) TX UE may exclude some candidate multislot resources based on the received SCI and/or non-monitored slots. Preferably in some embodiments, the (physical layer of the) TX UE may perform a conditional check if the number of remaining candidate multislot resources after the excluding step is smaller than x·m multi-total. If the number of remaining candidate multislot resources after the excluding step is not less than X.M multi-total, the remaining candidate multislot resources after the excluding step may be considered valid/identified candidate multislot resources and reported to higher layers of the TX UE. If the number of remaining candidate multislot resources after the excluding step is less than x·m multi-total, the (physical layer of the) TX UE will reinitialize the candidate multislot resources and then perform the excluding step based on the received SCI from the other UEs with increased RSRP threshold. In one embodiment, a side link resource pool in the unlicensed/shared spectrum may include one or more RB sets. The (physical layer of the) TX UE may perform sensing in a side link resource pool.
Preferably in some embodiments (the physical layer of) the TX UE may perform sensing on all of the one or more RB sets in the side link resource pool. The side link resources/subchannels in the one or more RB sets may be initialized to candidate single-slot resources. Preferably in some embodiments, M Total number of may be the total number of (initialized) candidate single-slot resources in all of the one or more RB sets. The (physical layer of the) TX UE may perform a conditional check if the number of remaining candidate single-slot resources after the excluding step is smaller than x·m Total number of . Preferably and/or alternatively, side link resources/subchannels in the one or more RB sets may be initialized to candidate multislot resources. M multi-total may be the total number of (initialized) candidate multislot resources in all of the one or more RB sets. The (physical layer of the) TX UE may perform a conditional check if the number of remaining candidate multislot resources after the excluding step is smaller than x·m multi-total.
Preferably and/or alternatively, (the physical layer of) the TX UE may perform sensing on a portion of the one or more RB sets in the side link resource pool. (e.g., side link resource pools include RB sets 1, 2, 3, and TX UE performs sensing on RB set 1 only, or on RB sets 1 and 2.) side link resources/subchannels in portions of the one or more RB sets or in the RB set that TX UE performs sensing may be initialized as candidate single-slot resources. Preferably in some embodiments, M Total number of may be the total number of (initialized) candidate single-slot resources in the portion of the one or more RB sets or in the RB set where the TX UE performs the sensing. The (physical layer of the) TX UE may perform a conditional check if the number of remaining candidate single-slot resources after the excluding step is smaller than x·m Total number of . Preferably and/or alternatively, side chain resources/sub-channels in a portion of the one or more RB sets or in the RB set where the TX UE performs sensing may be initialized to candidate multislot resources. M multi-total may be the total number of (initialized) candidate multislot resources in the portion of the one or more RB sets or in the RB set where the TX UE performs sensing. The (physical layer of the) TX UE may perform a conditional check if the number of remaining candidate multislot resources after the excluding step is smaller than x·m multi-total.
For all of the concepts, methods, alternatives, and embodiments above and herein, the following teachings may be implemented. Furthermore, it should be noted that any of the concepts, methods, alternatives, and embodiments above and herein may be combined or applied simultaneously.
Preferably, in some embodiments, the RB set may be/means/include/change/represent/replace as an LBT band or an LBT unit. The RB set is related to frequency resources in the frequency domain.
Preferably in some embodiments, the side link control information for the PSSCH can be transmitted/delivered via the level 1 SCI and the level 2 SCI. Preferably in some embodiments, the side link control information for the PSSCH may be delivered at least in the PSCCH. Preferably in some embodiments, the side link control information for the PSSCH can include a level 1 SCI. Preferably in some embodiments, the level 1 SCI may be transmitted via a PSCCH. Preferably in some embodiments, the side link control information for the PSSCH can include a level 2 SCI. Preferably in some embodiments, the level 2 SCI may be transmitted via multiplexing with the PSSCH. Preferably in some embodiments, SCI Format 1 or SCI Format 1-X is a level 1 SCI. Preferably in certain embodiments, SCI format 2-A or 2-B or 2-C or 2-X is a grade 2 SCI.
Preferably in some embodiments, in order to transmit the PSSCH in a slot or sub-slot, the TX UE needs to transmit the SCI in the slot or sub-slot for scheduling the PSSCH.
Preferably in some embodiments, a slot may mean a side link slot. Preferably in some embodiments, the time slots may be represented/replaced as TTIs.
Preferably in some embodiments, a side link time slot may mean a time slot for a side link. Preferably, in some embodiments, the TTI may be a subframe (for a side link) or a slot (for a side link) or a sub-slot (for a side link). Preferably in some embodiments, the TTI comprises a plurality of symbols, for example 12 or 14 symbols. Preferably in some embodiments, the TTI may be a time slot comprising (fully/partially) side chain symbols. Preferably in some embodiments, a TTI may mean a transmission time interval for a side link (data) transmission. Preferably in some embodiments, the side-link time slots or time slots for the side-links may contain all of the orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols available for side-link transmission. Preferably in some embodiments the side link time slots or time slots for the side links may contain a consecutive number of symbols available for side link transmission. Preferably in some embodiments a side link time slot or a time slot for a side link means that the time slot is included in the side link resource pool.
Preferably, in some embodiments, a symbol may mean a symbol that is indicated/configured for a side link.
Preferably in some embodiments, a time slot may mean/include a side link time slot associated with a (side link) resource pool. Preferably in some embodiments, a slot may not mean/include a side link slot associated with other (side link) resource pools.
Preferably in some embodiments contiguous/consecutive time slots may mean contiguous physical time slots.
Preferably in some embodiments contiguous/consecutive time slots may mean contiguous side link time slots in/for the (side link) resource pool. Preferably in some embodiments contiguous/consecutive time slots may or may not be contiguous/consecutive in a physical time slot. This means that contiguous/consecutive slots in the sidelink resource pool may not be contiguous/consecutive from the physical slot's point of view. Preferably in some embodiments contiguous/consecutive time slots may or may not be contiguous/consecutive in/for a side link bandwidth part (BWP) or a side link carrier/cell. This means that contiguous/consecutive time slots in the (sidelink) resource pool may not be contiguous/consecutive from the side of sidelink BWP or sidelink time slots in the sidelink carrier/cell. Preferably in some embodiments there may be one or more (side link) resource pools in the side link BWP or side link carrier/cell.
Preferably in some embodiments, the sub-channels are units for side link resource allocation/scheduling (for PSSCH). Preferably, in some embodiments, the sub-channel may comprise a plurality of contiguous PRBs in the frequency domain. Preferably in some embodiments the number of PRBs for each subchannel may be (pre) configured for a side chain resource pool. Preferably in some embodiments, the side link resource pool (pre) configuration may indicate/configure the number of PRBs for each subchannel. Preferably, in some embodiments, the number of PRBs for each subchannel may be any of 10, 12, 15, 20, 25, 50, 75, 100. Preferably in some embodiments, the sub-channels may be represented as units for side link resource allocation/scheduling. Preferably in some embodiments, a sub-channel may mean a set of consecutive PRBs in the frequency domain. Preferably in some embodiments, a subchannel may mean a set of contiguous resource elements in the frequency domain.
Preferably in some embodiments, the first UE may have/maintain/establish multiple side link links/connections over the PC5 interface. For different sidelink links/connections, the first UE may perform sidelink transmission to/reception from different paired UEs.
Preferably in some embodiments, the UE may be/means/include/replace a device.
Preferably in some embodiments, the sidelink transmission/reception may be UE-to-UE transmission/reception. Preferably in some embodiments, the side-link transmission/reception may be device-to-device transmission/reception. Preferably in some embodiments, the side link transmit/receive may be V2X transmit/receive. Preferably, in some embodiments, the side link transmission/reception may be pedestrian-to-evaluation (P2X) transmission/reception. Preferably in some embodiments, the side link transmission/reception may be on a PC5 interface.
Preferably, in some embodiments, the PC5 interface may be a wireless interface for device-to-device communication. Preferably, in some embodiments, the PC5 interface may be a wireless interface for communication between devices. Preferably, in some embodiments, the PC5 interface may be a wireless interface for communication between UEs. Preferably, in some embodiments, the PC5 interface may be a wireless interface for V2X or P2X communications. Preferably in some embodiments the Uu interface may be a wireless interface for communication between the network node and the device. Preferably in some embodiments the Uu interface may be a radio interface for communication between the network node and the UE.
Preferably, in some embodiments, the first UE may be the first device. Preferably in some embodiments, the first UE may be a vehicle UE. Preferably in some embodiments, the first UE may be a V2x UE.
Preferably, in some embodiments, the second UE may be a second device. Preferably in some embodiments, the second UE may be a vehicle UE. Preferably in certain embodiments, the second device may be a V2X UE.
Preferably in some embodiments the first UE and the second device are different devices.
Preferably in some embodiments, the TX UE performs LBT for energy detection prior to transmission in the unlicensed spectrum. Preferably in some embodiments, the frequency granularity of LBT in FR1 will be 20MHz, which may be represented as LBT bands or LBT units or RB sets (in the frequency domain). Preferably in some embodiments, the carrier or SL BWP or SL resource pool may comprise one or more LBT bands. Preferably, in some embodiments, the interleaving structure may be used to meet the occupied channel bandwidth (Occupied Channel Bandwidth, OCB) and Power spectral density (Power SPECTRAL DENSITY, PSD) requirements specified in the unlicensed spectrum. Preferably in some embodiments, equal space within one interlace or equal PRB number between two adjacent PRBs within one interlace is preferred. Preferably in some embodiments, for two adjacent interlaces, they may be PRB domain offsets from each other. For example, interlace #0 would occupy PRB #0, #10, #20, … #90, and interlace #1 would occupy PRB #1, #11, #21, … #91. Preferably in some embodiments such an interleaving structure is feasible to meet the requirements in the unlicensed spectrum for one LBT band. However, when reaching a broadband, e.g. carrier/BWP/pool comprising more than one LBT band, there may be some problems to be solved. Since there may be guard bands including one or more PRBs between adjacent LBT bands, the interleaving within each LBT band may be different by the introduction of the guard bands. By introducing guard bands within one side link resource pool, a first problem is how to define frequency units for sub-channels in the side link, which are units that may require further designed side link operation. The signaling aspect of the wideband sidelink resource pool may require further design how to indicate to the RX UE that the TX UE is using more than one LBT band for performing sidelink transmission.
A second problem is that resource selection may require further investigation as to how the UE (in mode 2, autonomously selects resources based on the sensing result) selects resources for one or more TBs.
Concept B
This concept B is to send or indicate the number of contiguous LBT bands in SCI (which can be replaced by a set of RBs that solve the same problem). Preferably in some embodiments it is not necessary to indicate via a bitmap which RB set is being used for side link transmission. Preferably, in some embodiments, the TX UE may send or indicate the number of contiguous RB sets to the RX UE over the contiguous RB set aspect. Preferably, in some embodiments, the TX UE determines one or more RB sets to be contiguous to each other based on the LBT result. Preferably in some embodiments, the TX UE will transmit the SCI in the lowest subchannel in the lowest RB set of the one or more RB sets.
Preferably, in some embodiments, the RX UE may determine the number of contiguous RB sets being used based on the SCI indication. Preferably in some embodiments, the RX UE may determine from which RB set the one or more RB sets start based on the detected position of the SCI. Preferably in some embodiments, the RX UE may determine that the RB set {1,2} is occupied by the TX UE, for example, if the detected SCI is in RB set 1 and the indication of the number of contiguous RB sets is 2.
Preferably in some embodiments, the SCI is transmitted in a subchannel within an LBT band. Preferably in some embodiments, one sub-channel comprises K interlaces. Preferably in some embodiments, k=1 or 2 is based on a (pre) configuration for a subcarrier spacing (SCS) =15khz. Preferably in some embodiments, k=1 is based on a (pre) configuration for scs=30 khz. Preferably in some embodiments, one interlace within one RB set comprises n_prb_i/M PRBs and preferably has a top value function or floor function, where n_prb_i corresponds to the number of PRBs in RB set i and M corresponds to the number of interlaces in one RB set.
Preferably, in some embodiments, the TX UE may communicate with the RX UE in a side chain resource pool.
Preferably in some embodiments, the side link resource pool is in the unlicensed spectrum.
Preferably in some embodiments, the side link resource pool comprises several RB sets.
Preferably in some embodiments the side chain resource pool comprises one or more guard bands.
Preferably in some embodiments the side link resource pool is in SL BWP or side link carrier.
Preferably in some embodiments, SL BWP or side link carriers or side link resource pools may be associated with the configuration of one or more guard bands.
Preferably in some embodiments, the separation of the number of RB sets is determined based on a configuration of the one or more guard bands.
Preferably in some embodiments the same number or different number of PRBs or Virtual Resource Blocks (VRBs) in different guard bands.
Preferably in some embodiments, the staggered structure is common to the side link resource pool or side link BWP or side link carrier in some examples.
Preferably, in some embodiments, the indices of interlaces in different RB sets are associated with a common interlace index taking into account a common interlace structure among the RB sets.
For example, as shown in the first alternative in fig. 7 and 8, it is assumed that there are five common interlaces (e.g., common interlaces #0 to # 4). Interlaces #0 to #4 in RB set 0 correspond to common interlaces #0 to #4. Interlaces #0 through #4 in RB set 1 correspond to common interlaces #0 through #4 (i.e., interlace #0 in RB set 1 may not correspond to the lowest RB in RB set 1). Interlaces #0 to #4 in RB set 2 correspond to common interlaces #0 to #4.
For example, as shown in the second alternative in fig. 7 and 8, it is assumed that there are five common interlaces (e.g., common interlaces #0 to # 4). Interlaces #0 to #4 in RB set 0 correspond to common interlaces #0 to #4. Interlaces #0 through #4 in RB set 1 correspond to common interlaces #1 through #4, #0 (i.e., interlace #0 in RB set 1 corresponds to the lowest RB in RB set 1). Interlaces #0 to #4 in RB set 2 correspond to common interlaces #2 to #4, #0, #1.
Preferably, in some embodiments, the sub-channel index may be based on sub-channels within the RB set, followed by an increase in the RB set. In one example, as shown in fig. 5, consider a side chain resource pool including 3 RB sets, and subchannels #0 to #4 correspond to interlaces #0 to #4 in RB set 0 within RB set 0. Preferably, in some embodiments, subchannels # 5- #9 correspond to interlaces # 0- #4 in RB set 1 within RB set 1 (whether interlace #0 in RB set 1 corresponds to the lowest RB in RB set 1 may be determined based on the above, and this example shows interlace #0 in RB set 2 corresponds to the lowest RB in RB set 1). Preferably, in some embodiments, subchannels # 10- #14 correspond to interlaces # 0- #4 in RB set 2 within RB set 2 (whether interlace #0 in RB set 2 corresponds to the lowest RB in RB set 2 may be determined based on the above, and this example shows interlace #0 in RB set 2 corresponds to the lowest RB in RB set 2). Alternatively, consider that subchannels 0-4 are reused in each RB set. Preferably, in some embodiments, subchannel 0 in each RB set is associated with a common interlace 0. Preferably in some embodiments, subchannel 1 in each RB set is associated with common interlace 1, and so on. In this example, the lowest subchannel in each RB set (whether 0 or 5 in RB set 1) may not include the lowest RB in each RB set.
Preferably in some embodiments, from a signaling aspect, when the SCI indicates a Frequency Resource Indicator Value (FRIV), the SCI indicates a first number of subchannels in the same set of RBs as the set of RBs used to transmit the SCI. Preferably, FRIV is applied to one RB set in some embodiments. Preferably, FRIV will be associated with the same common interlace in the other/another set of scheduled RBs in some embodiments. For example, if there are 2 RB sets scheduled, the first number of subchannels is determined or indicated by the SCI. There is a doubling of the first number of subchannels scheduled by the SCI since the SCI indicates 2 RB sets.
Preferably in some embodiments there is an association between sub-channels in different RB sets. Preferably, in some embodiments, the association may be determined based on the same common interleaving index. Preferably in some embodiments, for example as shown in fig. 5, there is an association between #0, #9, #13 (using common interleaving denoted as long single-sided arrow) and #1, #5, #14, because they use the same common interleaving index (using common interleaving denoted as short single-sided arrow).
Preferably in some embodiments, the common interleaving configures the resource pool per side link, the SL BWP or SL carrier, or (pre) per unicast link.
Preferably, in some embodiments, common interlace #0 corresponds to RB 0, 5, 10, …, as shown in fig. 7. Preferably, in some embodiments, RBs in the guard band between RB sets 0, 1 or between RB sets 1, 2 may be associated with one common interlace. Preferably in some embodiments, whether the TX UE uses RBs in the guard band is based on whether the TX UE successfully performs for two adjacent sets of RBs. Preferably in some embodiments, once/when/in response to the TX UE occupying two adjacent sets of RBs, the use of RBs in the guard band is based on common interleaving. For example, as shown in fig. 7, when the TX UE successfully performs for RB set 0 and RB set 1 (but fails to pass LBT for RB set 2), the TX UE will transmit SCI and an indication to use both RB sets in subchannel #1. Preferably, in some embodiments, the TX UE will transmit PSSCH/channel state information reference signals (CSI-RS)/phase tracking reference signals (PT-RS) in RBs 51 corresponding to common interlace #1 or using the same common interlace with subchannel #1 as shown in fig. 7. Preferably in some embodiments, the TX UE will transmit the TB/MAC PDU or PSSCH over sub-channel #1 (which may exclude resources for the PSCCH) and sub-channel number 5 (which corresponds to common interlace #1 or uses the same common interlace with sub-channel # 1). Preferably in some embodiments, FRIV designs are based on subchannels within one RB set (e.g., the lowest RB set). Preferably in some embodiments, the FRIV design is based on a common interleaving index. Preferably in some embodiments, when the RX UE receives an indication of such SCI with 2 RB sets in subchannel #1, the RX UE determines to indicate RB set #0 and RB set #1. Preferably in some embodiments, the subchannels in RB set 1 that have the same common interlace as the subchannels in RB set 0 are indicated or scheduled by SCI (i.e., subchannel # 5). For another example, if FRIV in the SCI or resource allocation indicates 3 subchannels (within one RB set), and the indication or signaling indicates 2 RB sets in the SCI detected in subchannel #1. Based on the indication of SCI, the RX UE will determine subchannels #1, #2, #3 and subchannels #5, #6, #7 for scheduling. Preferably in some embodiments, in one example, the subchannels in different sets of RBs scheduled by a SCI may correspond to different TB transmissions. Preferably in some embodiments, in another example, the subchannels in all different sets of RBs scheduled by a SCI may correspond to the same TB transmission (e.g., TBs are carried by all subchannels in all scheduled sets of RBs). Preferably in some embodiments, in another example, the subchannels in different sets of RBs scheduled by a SCI may correspond to the same TB transmission. Preferably, in some embodiments, subchannels #1, #2, #3 correspond to one TB, and subchannels #5, #6, #7 correspond to repetitions of the TB. Preferably, in some embodiments, repetitions of a TB may be associated with different redundancy versions. Preferably in some embodiments, the TB/MAC PDUs in the subchannels in the lowest RB set correspond to rv=0 and the TB/MAC PDUs in the subchannels in the lowest RB set correspond to rv=2 (which is based on a predefined order, e.g. rv=0, 2, 3, 1, or rv=0, 3, 0, 3, in this example rv=0, 2, 3, 1 is used/applied).
Concept C
This concept C is to select resources in the same RB set. For MCSt, one constraint and/or limitation exists to select one or more contiguous resources in the same or a subset of one or more RB sets as a particular candidate resource to occupy when the particular candidate resource is selected. Preferably, in some embodiments, the particular candidate resource may comprise one or more sub-channels (contiguous in the RB set domain) among the one or more RB sets. Preferably, in some embodiments, a particular candidate resource may be in TTI i. Preferably in some embodiments, when resources for the MCSt in TTI i+1 are selected in addition to TTI i, there is a constraint/restriction that resources in the same set of RBs are selected as specific resources in TTI i or that a subset set of RBs is used to select resources as specific resources in TTI i (if MCSt is enabled/used). Preferably in some embodiments, in order to select resources for the MCSt, it is necessary to guarantee a non-strictly reduced number of RB sets in future/later TTIs. Preferably in some embodiments, for any two consecutive TTIs (in a side link resource pool), the resources in the earlier TTI should comprise a greater or equal number of RB sets than the resources in the later TTI (within the period/unit for MCSt). Preferably in some embodiments the RB sets in the earlier TTI or the later TTI should be contiguous in the RB set domain. Preferably in some embodiments, adjacencies in the RB set domain mean or correspond to adjacencies in the RB set index. Preferably, in some embodiments, the resources in TTI i and the resources in TTI i+1 for the mcpt may correspond to the same common interlace index (e.g., may be associated with different subchannel indexes). Preferably, in some embodiments, the resources in TTI i and the resources in TTI i+1 for the mcpt may correspond to the same subchannel index (e.g., if the subchannel index is reused in each RB set of the side-link resource pool).
For example, as shown in fig. 9, possible combinations of RB sets for resource allocation of a side chain resource pool including 3 RB sets may be shown. Preferably, in certain embodiments, when the TX UE is enabled or supports MCSt, the TX UE may select a first resource in the 3 RB set in TTI 1 and a second resource in the 2 RB set in TTI 2 or a third resource in the 1 RB set in TTI 3. Preferably, in some embodiments, when the TX UE is enabled or supports MCSt, the TX UE may select a first resource in the 2 RB set in TTI 1 and a second resource in the 2 RB set in TTI 2 or a third resource in the 1 RB set in TTI 3. Preferably, in some embodiments, the second resource is in the same 2 RB set as the 2 RB set for the first resource in TTI 1. Preferably, in some embodiments, the 2 RB sets are not allowed to be in 2 RB sets different from the 2 RB sets used for the first resource in TTI 1. Preferably in some embodiments, in other words, once the combination/number of RB sets for the first resource in TTI 1 is determined, the combination/number of RB sets for the second resource in TTI 2 is constrained or limited to (part/subset of) the combination/number of RB sets in TTI 1. Preferably in some embodiments the same logic is applied to the second resource in TTI 2 and the third resource in TTI 3. Preferably in some embodiments, in general, for an MCSt with 3 TTIs considering a side link resource pool with 3 RB sets (e.g., RB sets 0, 1, 2), the combination of candidate resources occupying which RB set may be shown below. Preferably in certain embodiments, the aforementioned constraints/limitations/methods/choices may or may not apply to at least two consecutive MCSt periods/units in the time domain (based on a particular configuration). If not, then the number of selected sets of RBs in the later MCSt may be greater than the earlier MCSt, and/or the index of the selected set of RBs in the later MCSt may be different from the earlier MCSt.
/>
Alternatively and/or preferably in some embodiments, when one or more resources in one or more consecutive TTIs are encapsulated or grouped into one MCSt unit in the time domain, the one or more resources should be in the same set of RBs or subset of sets of RBs compared to the earlier TTI. Preferably in certain embodiments, when the TX UE encapsulates or groups one or more resources in one or more consecutive TTIs into one MCSt unit in the time domain, the one or more resources in each of the MCSt units should follow the above teachings of 3 TTIs.
Preferably in some embodiments, RB 0, 5, 10, 5i, … correspond to a common interlace index 0 (e.g., long arrow in fig. 7).
Preferably in some embodiments, RB 1, 6, 11, 5i+1, … correspond to common interlace index 1 (e.g., short arrow in fig. 7).
Preferably in some embodiments, RB 2, 7, 12, 5i+2, … correspond to common interlace index 2 (e.g., diamond arrow in fig. 7).
Preferably in some embodiments, RB 3, 8, 13, 5i+3, … correspond to common interlace index 3 (e.g., double diamond in fig. 7).
Preferably in some embodiments, RB 4, 9, 14, 5i+4, … correspond to common interlace index 4 (e.g., double arrow in fig. 7).
Concept D
This concept D is a definition of candidate resources within a selection window designed for pattern 2 resource identification and resource selection. Preferably in some embodiments, the higher layer of the TX UE will provide several subchannels (e.g., L) for resource identification and selection. Preferably, in some embodiments, one candidate resource in the conventional NR Rel-16 SL is one slot and one starting subchannel. Preferably in some embodiments, the candidate resources (defined in the unlicensed spectrum) will be different. Preferably in some embodiments, a side chain resource pool comprising m×n subchannels is considered, where M corresponds to the number of interlaces and/or the number of subchannels in one RB set, and N corresponds to the number of RB sets associated with the side chain resource pool.
Preferably in some embodiments, when counting how many candidate resources are in a slot in the side link resource pool, some action with exclusion and/or inclusion will be applied. Preferably in some embodiments, the application will have some kind of operation of excluding and/or inclusion when counting how many candidate resources are in total in the resource selection window in the sidelink resource pool. Preferably in some embodiments the resource selection window may comprise more than one time slot in the side link resource pool.
Preferably in some embodiments, the excluding and/or inclusion is based on a side link resource pool configured in the unlicensed spectrum (e.g., with type 1/2/2A/2B/2C channel access prior to performing the transmission). Preferably in some embodiments, no exclusion and/or inclusion (when counting how many candidate resources are in a slot) is applied to a pool configured in the licensed spectrum (e.g., without type 1/2/2A/2B/2C channel access before transmission is performed).
Preferably in some embodiments, the TX UE will determine or identify X% of the total number of candidate resources in the selection window.
Preferably in some embodiments, determining or identifying X% of the total number of candidate resources may be based on excluding one or more resources (based on sensing results) that result in half duplex and/or are occupied by another/other UE.
Preferably in some embodiments, if the total number of candidate resources in the selection window includes a particular candidate resource that includes subchannels in different RB sets, with no equal space in the frequency domain, the TX UE will exclude the particular candidate resource (when determining or identifying X% of the total number of candidate resources in the selection window).
Preferably in some embodiments, X is configured per priority.
Preferably in certain embodiments, x=20.
Preferably, in some embodiments, the lower layer (e.g., physical (PHY) layer) of the TX UE will report X% of the total number of candidate resources to the higher layer (e.g., MAC layer) of the TX UE for resource selection.
Preferably, in some embodiments, the higher layer of the TX UE will randomly select one or more candidate resources for transmission of one or more TBs.
Preferably, in some embodiments, subchannel #9 or subchannel #0 in RB set 1 may be replaced by one specific subchannel in RB set 1, wherein the one specific subchannel includes the same common interlace index as subchannel #0 in RB set 0. Preferably in some embodiments, the first particular sub-channel comprises K interlaces in the first RB set (e.g., k=1, 2, and having contiguous interlace indices). Preferably in some embodiments, the second particular sub-channel includes the same number K of interlaces in the second set of RBs (e.g., k=1, 2, and having contiguous interlace indices). Preferably, in some embodiments, candidate resources including subchannels in different RB sets may be based on the same common interlace index. Preferably in some embodiments, the subchannels in different sets of RBs associated with the candidate resource are based on the same common interlace index for the subchannels in different sets of RBs. Preferably in some embodiments, the subchannels in different sets of RBs associated with different common interlaces cannot be associated with candidate resources or are not valid/available subchannel combinations for the resources.
Preferably in some embodiments, which RBs in the guard band are associated with which sub-channels are based on the same common interlace index.
For example, as shown in fig. 7, assume that TX UE transmits SCI in subchannel 5 and uses an indication of subchannels 5, 6, 10, 14. Preferably, in some embodiments, the TX UE may use Y RBs in the guard band. Preferably, in some embodiments, RBs 106 and 111 are the same common interlace structure/index as sub-channel 5 and sub-channel 14, based on common interlaces. Preferably in some embodiments, RB 107 is the same common interlace structure/index as subchannel 6 and subchannel 10. Preferably in some embodiments RB 106 is associated with subchannel 5. Preferably in some embodiments RB 111 is associated with subchannel 14.
Preferably in some embodiments, one slot may be replaced by a TTI.
Preferably, in some embodiments, one TTI may be more than one consecutive slot (in a side chain resource pool).
Preferably, in some embodiments, when the TX UE transmits the side link using each candidate resource in one TTI, the start symbol of each candidate resource in a different TTI may be different. Preferably in some embodiments it may depend on the LBT result and the position of the additional start symbol per TTI.
Preferably in some embodiments, the candidate resources comprise a first number of (consecutive) subchannels in the first set of RBs and a second number of (consecutive) subchannels in the second set of RBs.
Preferably in some embodiments, the first set of RBs and the second set of RBs are in a side link resource pool.
Preferably in some embodiments, the first set of RBs has an RB set index contiguous with the RB set index of the second set of RBs.
Preferably in some embodiments the first number of (consecutive) sub-channels is the same as or may be different from the second number of (consecutive) sub-channels.
Preferably in some embodiments different side chain resource pools in the same SL BWP or SL carrier may share the same interleaving structure.
Alternatively, different side link resource pools in the same SL BWP or SL carrier may be configured with different interleaving structures. For example, the subchannel indexes in different side-chain resource pools may be configured with or include different numbers of interlaces. For example, one/each sub-channel in a first side link resource pool in SL BWP comprises one interlace, while one/each sub-channel in a second side link resource pool in SL BWP comprises two interlaces.
Preferably in some embodiments, the first sidelink resource pool is configured in the same SL BWP as the second sidelink resource pool. Preferably in some embodiments there is one subcarrier spacing (SCS) associated with SL BWP. Preferably in some embodiments, one constraint or restriction for SL BWP is that the subchannels in the first side-link resource pool or in the second side-link resource pool comprise the same number of interlaces (once/when/if the first side-link resource pool and the second side-link resource pool are in the same SL BWP).
Preferably in some embodiments, in some instances, the first sidelink resource pool is configured in a different SL BWP or SL carrier than the second sidelink resource pool.
Preferably in some embodiments, there may be some condition for the TX UE to use candidate resources including sub-channels in different RB sets. Preferably in certain embodiments, any one or any combination of conditions may be:
-CBR > threshold.
-The total number of candidate resources without counting candidate resources with different RB sets < threshold.
Increasing the number of 3dB RSRP > threshold (e.g., 3).
-Selecting candidate resources for retransmission (except for new transmission).
L (candidate resource length or number of adjacencies of subchannels) is greater than M (number of interlaces).
L (candidate resource length or number of adjacencies of sub-channels) is larger than a threshold.
Preferably, in some embodiments, when L is less than a threshold (e.g., the threshold may be preconfigured or fixed or determined to be the same as the value M of the number of interlaces), candidate resources comprising subchannels in different RB sets are not used or disabled, and/or the TX UE is not allowed to select/identify or does not select/identify candidate resources comprising subchannels in different RB sets. Preferably, in some embodiments, candidate resources comprising subchannels in different RB sets may be used or enabled when L is greater than or equal to a threshold, and/or the TX UE is allowed to select/identify or may select/identify candidate resources comprising subchannels in different RB sets. Preferably, in some embodiments, candidate resources including subchannels in different RB sets are associated with the same common interlace index. Preferably, in some embodiments, candidate resources comprising subchannels in different RB sets are associated with the same subchannel index in different RB sets. For example FRIV in SCI indicates subchannels 0-3 and 2 RB sets and SCI is detected in RB set 1, using subchannels 0-3 in RB sets 1 and 2.
Preferably in some embodiments, RBs in the guard band may be associated with subchannels in a lower set of adjacent RBs starting from the lowest subchannel plus one. For example, as shown in FIG. 5, it is assumed that subchannels 0-4 are present in each RB set (instead of defining subchannels 5-14). Preferably in some embodiments, subchannel 0 in each RB set corresponds to a subchannel including the lowest RB in the respective RB set.
Preferably, in some embodiments, when the TX UE passes LBT for transmission on subchannels 1, 2,3 in RB set 0 and RB set 1,
RBs 50-55 in the guard band may be associated with subchannels 2,3, 2,3 in RB set 0.
RBs 50-55 in the guard band may be associated with subchannels 2, 3 in RB set 0 and 1,2, 3 in RB set 1.
Preferably in some embodiments, the RB in the guard band is the last RB in the associated subchannel.
Preferably, in some embodiments, the higher layer of the TX UE may select a first candidate resource in the first slot and a second candidate resource in the second slot. Preferably in some embodiments, the first time slot and the second time slot may be the same time slot. Preferably in some embodiments the first time slot and the second time slot may be different time slots. Preferably in some embodiments, the first candidate resource and the second candidate resource are used for TB transmission. Preferably in some embodiments, the first candidate resource is associated with a first set of RBs. Preferably in some embodiments, the second candidate resource is associated with a second set of RBs. Preferably in some embodiments, the TX UE will determine whether to proceed based on the LBT result for each RB set in response to the same time slot of the first and second time slots. Preferably, in some embodiments, the first candidate resource may comprise a different starting sub-channel than the starting sub-channel associated with the second candidate resource. Preferably in some embodiments, the space between the interlaces associated with the sub-channels or the sub-channels associated with the first candidate resources may be unequal compared to the interlaces associated with the sub-channels or the sub-channels associated with the second candidate resources. Preferably in some embodiments, each candidate resource (whether from the RB set) has the same contiguous number of subchannels (e.g., L). Preferably in some embodiments, the respective set/number of candidate resources for each RB set includes candidate resources having the same contiguous number of subchannels (e.g., L). Preferably in some embodiments, the candidate resources in each candidate resource set associated with the respective RB set are in the respective RB set.
Preferably in some embodiments, the TX UE will perform side-link transmission on the first candidate resource (within the lower RB set) when/if the TX UE passes LBT for the first and second RB sets simultaneously (or said passes LBT for more than one RB set). Preferably in some embodiments, the TX UE will perform side-link transmission on the second candidate resource (within the higher RB set) when/if the TX UE passes LBT for the first and second RB sets simultaneously (or said passes LBT for more than one RB set). Preferably in some embodiments, the TX UE may select one when/if the TX UE passes LBT for the first and second sets of RBs simultaneously (or said passes LBT for more than one set of RBs), based on another/other conditions such as CBR. Preferably in some embodiments, the TX UE may perform side chain transmission on both the first candidate resource and the second candidate resource (when/if the TX UE supports this capability). Preferably, in some embodiments, RBs in the guard band between the first set of RBs and the second set of RBs may be used. Preferably in some embodiments, which RB in the guard band is used is an SCI based indication.
Preferably, in some embodiments, the TX UE may be configured with whether to perform inclusion including subchannels in different sets of RBs (e.g., across a set of RBs) or candidate resources supporting transmission across a set of RBs.
Preferably in some embodiments, the candidate resources include subchannels in different RB sets associated with the same common interlace index.
Preferably, in some embodiments, the TX UE may be configured with the inclusion of candidate resources including subchannels in different RB sets (e.g., across RB sets) or supporting transmissions across RB sets, based on a side link resource pool comprising more than one RB set.
Preferably, in some embodiments, the TX UE may be configured with whether to perform the exclusion of candidate resources including sub-channels in different RB sets (e.g., across RB sets) or supporting transmissions across RB sets based on a side link resource pool including more than one RB set and an interlace structure for side link transmissions in the side link resource pool.
Preferably, in some embodiments, the TX UE may be configured with whether to perform inclusion of sub-channels including in different RB sets (e.g., across RB sets) or candidate resources supporting transmission across RB sets based on a side link resource pool including more than one RB set and an interlace structure for side link transmission in the side link resource pool.
Preferably, in some embodiments, for a side link resource pool configured to support or enable transmission across RB sets (e.g., using side link resources including subchannels in different RB sets), all UEs performing side link transmission using the side link resource pool will support or enable transmission across RB sets.
Preferably, in some embodiments, the number of sub-channels for candidate resources in different RB sets will be the same for candidate resources comprising sub-channels in different RB sets. Preferably in some embodiments, in one instance, there are no candidate resources with 1 subchannel in RB set 0 and 2 subchannels in RB set 1, and vice versa. Preferably in some embodiments, there are some limitations of L. Preferably, in certain embodiments, L may be any number for L.ltoreq.M. Preferably, in certain embodiments, for L > M, L is limited to a multiple integer number of at least one of the following numbers 2,3, … N, where N is the number of RB sets in the side link resource pool. Preferably in certain embodiments, the basic theory is to have/equally divide into at least one of the numbers. For example, as shown in fig. 7, if l=7 is greater than m=5, and 7 is not divisible by 2 or n=3, then l=7 cannot be configured by higher layers. Preferably in some embodiments, as shown in fig. 7, the possible values of L should be 1,2, 3,4, 5, 6, 8, 9, 10, 12, 14, 15.
Preferably in some embodiments, the SCI is transmitted in the lowest subchannel of the lowest RB set of candidate resources.
Preferably in some embodiments, when the SCI indicates or transmits candidate resources comprising subchannels in different RB sets, the SCI may indicate or transmit FRIV of one RB set (which is the lowest RB set in the side-link resource pool or the lowest RB set of candidate resources). Preferably in some embodiments, the SCI will indicate that the contiguous number of RB sets is greater than 1 (as shown in concept B).
Preferably in some embodiments, when the SCI indicates or transmits a candidate resource comprising a subchannel in the same RB set, the SCI may indicate or transmit FRIV of one RB set (which is the lowest RB set in the side-link resource pool or the lowest RB set of the candidate resource). Preferably in some embodiments, the SCI will indicate a number of contiguous RB sets of 1 (as shown in concept B).
Preferably, FRIV in some embodiments are based on subchannels in one RB set.
Preferably in some embodiments, code point 0 of FRIV corresponds to the lowest subchannel index in one RB set.
For example, as shown in fig. 7, the size of the field for FRIV would be log 2 (M (m+1)/2). Preferably in some embodiments, SCI is detected when it is detected in subchannel #5 having FRIV = {0,1 }. Based on the detected locations of the subchannels FRIV will be interpreted as subchannel #5 and subchannel #6. The indication of SCI is subchannel #5 and subchannel #6 based on the number of contiguous RB sets of 1, and/or the resources scheduled by SCI correspond to 2 subchannels. The indication of SCI is subchannel #5, subchannel #6, subchannel #10, and subchannel #14 based on the number of contiguous RB sets of 2, and/or the resources scheduled by SCI correspond to 4 subchannels. Preferably in some embodiments the resource allocation is based at least on the detected position of the sub-channel of the SCI. Preferably in some embodiments, when an SCI is detected instead of the lowest RB set (e.g., RB set 0), FRIV will be converted to one or more subchannels in the RB set in which the SCI was detected (e.g., FRIV for subchannels #0, #1, which are interpreted/converted to subchannels #5, #6 if #5 in RB set 1 detected the SCI, or to subchannels #10, #11 if SCI is detected in #10 in RB set 2). Preferably in some embodiments, the number of sub-channels for the PSSCH is based on FRIV and the number of contiguous RB sets (indicated by the SCI) (determination).
Preferably, in some embodiments, the association between interlaces and subchannels may be shown in fig. 10. Preferably in some embodiments, a common interlace of 0 is associated with the lowest subchannel in each RB set. Preferably in some embodiments, common interlace 1 is associated with the next lowest subchannel in each RB set, and so on. Preferably in some embodiments, subchannel #5 in the RB set is a subchannel including common interlace 0. Alternatively, consider that subchannels 0-4 are reused in each RB set. Preferably, in some embodiments, subchannel 0 in each RB set is associated with a common interlace 0. Preferably in some embodiments, subchannel 1 in each RB set is associated with common interlace 1, and so on. In this example, the lowest subchannel in each RB set (whether 0 or 5 in RB set 1) may not include the lowest RB in each RB set.
Concept E
This concept E is that when performing resource (re) selection in the SL resource set for transmitting one or more MAC PDUs, the UE may select/set the number of retransmissions (for MAC PDUs) based on at least the number of reservation intervals (in slots or ms). For example, the UE may select/set the same number of retransmissions as the number of reservation intervals. For another example, the UE may select the number of retransmissions (in times) as the number of reservation intervals-1.
The SL resource set may be used for multiple contiguous slot transmission. The SL resource sets may be contiguous in the time domain. For example, there may be no time gap between nearby/adjacent resources in the SL resource set.
Resource (re) selection may be performed to select a set of SL resources. Each SL resource in the set of SL resources may be used to perform a new transmission of SL data or MAC CEs or a retransmission of SL data and/or MAC CEs (previously generated/transmitted). The UE may expect to select continuous SL resources (e.g., continuous and without gaps between SL resources in the time domain) when or if the UE operates in the SL unlicensed spectrum and/or selects a pool of SL resources in the SL unlicensed spectrum for SL transmission.
Additionally and/or alternatively, to select the contiguous resources, the UE may be configured (either by the network configuration or by pre-configuration or by other UEs) with a configuration or parameter that instructs the UE to select the contiguous resources. For example, the UE may be configured with MCSt behavior, features or functionality for a SL resource pool or for PC5 links or side link connections. Additionally and/or alternatively, the UE may determine to select the contiguous resources based on whether the UE is operating on or selecting resources in the unlicensed spectrum.
The reservation interval may be a value selected by the UE. The reservation interval may be configured/provided by the network (e.g., via a Radio Resource Control (RRC) dedicated message or system information) or pre-configured in the UE. For example, the reservation interval may be a value configured in a reservation interval candidate list (e.g., sl-ResourceReservePeriodList).
Additionally and/or alternatively, network (NW) configuration to the UE (e.g., a candidate list of reservation intervals and/or a maximum number of hybrid automatic repeat request (HARQ) transmissions) with respect to SL resource parameters may be contemplated to ensure that new transmissions and retransmissions are continuous. For example, NW may expect (always) to configure a value of 1 and/or a value of 0 in the candidate list of the reservation interval.
Additionally and/or alternatively, if the MCSt is configured or enabled for the UE (in the SL resource pool or on the SL unlicensed spectrum), the UE may expect to select contiguous resources for new transmission and/or retransmission of one or more MAC PDUs.
Alternatively, the UE may not consider CBR measurements and/or priority of SL data when selecting the number of retransmissions if or when performing resource (re) selection in the SL unlicensed spectrum. The UE may not expect to select a set of SL resources with a time gap separating each resource (when the set of SL resources is associated with a SL resource pool in the SL unlicensed spectrum).
Additionally and/or alternatively, the UE may select/set the number of HARQ (re) transmissions for transmission of MAC PDUs on the SL unlicensed spectrum. The UE may select/set a reservation interval based on the number of HARQ retransmissions. For example, the UE may set the value (in ms or slot units) of the reservation interval for SL transmission of the MAC PDU to be the same as the number of HARQ retransmissions, or the number of HARQ retransmissions +1.
An example is shown in fig. 11. The UE may be configured with MCSt operation and/or to operate/select resources in the SL resource pool in channel occupation times in the SL unlicensed spectrum. The UE may determine or decide to select a set of SL resources for transmission of multiple MAC PUDs or TBs. The UE may select a value for the reservation interval. The UE may be (pre) configured with a list of possible reservation intervals (e.g. sl-ResourceReservePeriodList). The UE may select a value in the list of possible reservation intervals for the reservation interval (e.g., select sl-ResourceReservePeriod = 3). The UE may select the number of HARQ retransmissions based on at least the reservation period. For example, the UE may set or select/derive the number of HARQ retransmissions to 2 (or select the number of HARQ transmissions to 3). When selecting time and frequency resources for the SL resource set, the UE may select the first subset of resources at timings t1, t4, and t 7. The UE may select the second subset of resources at timings t2, t5, and t 8. The UE may select a third subset of resources at timings t3, t6, and t 9. Each resource in the subset of resources is spaced apart by a reservation interval selected in the time domain. The UE may consider the first subset of resources as a new transmission opportunity for SL MAC PDU transmission (based on the resources preceding the second and third subsets of resources in the time domain). The UE may consider the first subset of resources as retransmission opportunities. The combination of the first subset of resources, the second subset of resources, the third subset of resources (e.g., the selected set of SL resources) may be contiguous in the time domain. The selected set of SL resources may not exceed the COT.
Additionally and/or alternatively, the network may configure two reservation interval candidate lists. For example, the network may configure a first candidate list for licensed spectrum and a second candidate list for unlicensed spectrum. When selecting the reservation interval, the UE may determine whether to select from the first candidate list or the second candidate list based on the selected resource pool being associated with the licensed or unlicensed spectrum.
Additionally and/or alternatively, the network may configure two maximum numbers of HARQ transmissions. For example, the network may be configured with a first maximum number for licensed spectrum and a second maximum number for unlicensed spectrum.
Additionally and/or alternatively, the network may configure a fixed number of reservation intervals (e.g., instead of a candidate list) for the SL unlicensed spectrum. Additionally and/or alternatively, the network may configure a fixed number of HARQ transmissions (e.g., instead of a candidate list) for the SL unlicensed spectrum.
Additionally and/or alternatively, to select a set of SL resources (in the SL resource pool) in the SL unlicensed spectrum, the UE may select a set of contiguous resources by setting the reservation interval to 1. The UE may not select or set the number of retransmissions. Additionally and/or alternatively, the UE may select a contiguous set of RESOURCEs having a number of RESOURCEs less than the derived/selected value (e.g., sl_resource_ RESELECTION _counter). The derived/selected value may be the number of (respective) MAC PDUs to be transmitted in the SL resource set. Alternatively, the number of RESOURCEs may be greater than sl_resource_ RESELECTION _counter. For example, the number of RESOURCEs may be a multiple of sl_resource_ RESELECTION _counter (e.g., sl_resource_ RESELECTION _counter multiplied by the number of HARQ transmissions). Alternatively, the number of resources may be equal to (or less than) the number of resources, which may be selected for the set of SL resources in the COT. Alternatively, the UE may select at least one SL resource for each timing (e.g., every ms or every slot) in the COT. For each of the resources in the SL resource set, the UE may determine whether the resource is for a new transmission or for a retransmission. The UE may assign or deploy its SL HARQ process to each of the resources for new transmission of MAC PDUs or retransmission of MAC PDUs (already transmitted or generated).
An example is shown in fig. 12. For resource selection for a set of SL resources in a SL resource pool in the SL unlicensed spectrum, the UE may select several consecutive SL resources. The UE may select the resources available during the COT. The UE may select or set the number of reservation intervals to 1. The UE may select a number (e.g., 3) for the number of HARQ transmissions. The UE may derive a value (e.g., 2 in fig. 12) for the number of (respective or different) MAC PDUs to be transmitted in the SL resource set. The UE may determine or decide on the number of resources to select for the SL resource set based on the number of HARQ transmissions and the number of MAC PDUs to be transmitted (e.g., 3 times 2 equals 6). Alternatively, the UE may not consider the number of reservation intervals or the number of HARQ transmissions when selecting resources in the unlicensed spectrum. The UE selects 6 resources with timing in COT (in timings t1 to t 6). The UE may determine or decide whether each resource in the set of resources is for a new transmission or for a retransmission (based on data priority, latency, qoS, or higher layer configuration). For example, the resource at timing t1 is a new transmission for MAC PDU TB 1. The resource at timing t2 is a new transmission for MAC PDU TB 2. The resources at t3 to t6 are for retransmission of TB1 and/or TB 2.
Additionally and/or alternatively, the set of SL resources may be segmented or split between transmissions of different MAC PDUs. For example, for transmission of a MAC PDU, there may be a batch of transmissions (new transmission and one or more retransmissions; or one or more retransmissions).
The configuration or parameters may be (pre) configured for the UE to indicate whether the transmission resources of the MAC PDU should be continuously selected/set in the time domain. For example, if the parameters for the continuous transmission are configured or enabled, the UE may select retransmission resources (only) from available resources that are continuous in time domain with the new transmission of the MAC PDU. If the parameters for the continuous transmission are not configured or disabled, the UE may select retransmission resources from any available resources that may or may not be continuous with the new transmission of the MAC PDU in the time domain.
An example is shown in fig. 13. The UE may determine or decide to select a set of SL resources for transmission of multiple MAC PDUs. The UE selects the number of reservation intervals as P. The UE may be configured with (enabled for) continuous transmission of (a batch of) MAC PDUs or TBs. The UE may select the number of HARQ transmissions (e.g., 3). The number of HARQ retransmissions (e.g., 2) may be selected/derived. The UE may determine or select initial transmission resources spaced apart by a reservation interval P. The UE may select a contiguous retransmission resource for each of the initial transmission resources (e.g., t1, t2, and t3 contiguous in the time domain, t4, t5, and t6 contiguous in the time domain, and t7, t8, and t9 contiguous in the time domain).
The initial transmission resources may be used to transmit a first transmission instance/opportunity of a new transmission or a batch of retransmissions of a TB.
Additionally and/or alternatively, the UE may be configured with an MCSt configuration for each of the SL Logical Channels (LCHs). Each of the SL LCHs may be configured with an MCSt configuration. Each of the SL LCHs may be configured (individually) with either enabling or disabling. Each SL LCH may be associated with a priority. Each SL LCH may be associated with SL data having priority or with SL services.
When selecting the SL resource, the UE may determine whether to select a continuous resource in the time domain for the MAC PDU based on a configuration of a SL LCH having the highest priority among SL LCHs having at least SL data available.
Additionally and/or alternatively, the network may configure a third candidate list for a reservation interval for transmitting SL data having MCSt (associated with MCSt-enabled SL LCH). The network may configure a fourth candidate list for a reservation interval for transmitting SL data that is not needed or associated with the MCSt. Additionally and/or alternatively, the network may configure a third maximum number of transmissions for transmitting SL data having MCSt (associated with MCSt-enabled SL LCH). The network may configure a fourth maximum number of transmissions for transmitting SL data that is not needed or associated with the MCSt.
Referring to fig. 14, with respect to such and other concepts, systems and methods of the present invention, a method 1000 for a first UE includes receiving SCI (with a field) indicating a number of contiguous RB sets (step 1002), and receiving PSSCH based on one or more RB sets based on the number of contiguous RB sets and a location of SCI in the RB sets (step 1004).
Preferably in some embodiments, the SCI is transmitted from the second UE.
Preferably in some embodiments, SCI is transferred in a side chain resource pool.
Preferably in some embodiments, the side link resource pool comprises a first number of RB sets, wherein the first number of RB sets may be 1,2, 3, 4 or 5.
Preferably in some embodiments, the first number of RB sets associated with the side link resource pool is based on how many guard bands are contained in the side link resource pool.
Preferably, in some embodiments, the first number of RB sets is determined based on the number of guard bands.
Preferably, in some embodiments, the first number of RB sets is the number of guard bands plus one.
Preferably, FRIV is based on one RB set and may preferably be the lowest RB set in the side link resource pool in some embodiments.
Preferably in some embodiments, the side link resource pools are associated with a common interleaving structure.
Preferably, in some embodiments, the sub-channels in each RB set include a lowest RB index that is a sub-channel index 0.
Preferably, in some embodiments, the subchannels in each RB set include the same interlace index 0 (and 1) as the subchannels in the lowest RB set are subchannel indices 0.
Preferably in some embodiments, the subchannels in different RB sets will be indexed differently.
Preferably in some embodiments, the number of subchannels in each of the one or more RB sets is the same when the number of contiguous RB sets indicated by the SCI (field in) is more than one.
Preferably in some embodiments, the number of subchannels in each RB set is L, where L is indicated by FRIV or SCI, and/or the number of subchannels for PSSCH reception is (based on) the number of contiguous RB sets and L.
Preferably, in some embodiments, when FRIV indicates sub-channel 1,2 in RB set i and the number of contiguous RB sets is K, the first UE receives PSSCH in RB set i, i+1, …, i+k-1.
Preferably in some embodiments, the number of contiguous RB sets (e.g., K) with the location of the RB set (e.g., RB set i) for the detected SCI cannot exceed or is not allowed to exceed the RB set in the side link resource pool, and/or i+k-1 is less than or equal to N-1 (there are N RB sets in the side link resource pool, denoted 0-N-1).
Preferably, in some embodiments, the L subchannels in each RB set of the K RB sets are associated with the same common interlace index.
Preferably, in some embodiments, FRIV-based L subchannels are copied or copied into K RB sets.
Preferably in some embodiments, the RBs in the guard band are associated with subchannels of the RB set other than the lowest subchannel (according to FRIV).
Preferably in some embodiments, the SCI is received in one subchannel in RB set i and the one subchannel is used to determine the starting subchannel for FRIV or L subchannels in one RB set.
Preferably in some embodiments, the subchannels used for PSSCH reception in the RB sets other than RB set i are based on the same subchannel index in the RB set used in RB set i.
Preferably in some embodiments, the subchannels used for PSSCH reception in the RB sets other than RB set i are based on the subchannel index in the RB set having the same interlace index as the subchannels used/associated in RB set i.
Referring now to fig. 3 and 4, in one or more embodiments from the perspective of the first device, the device 300 includes program code 312 stored in a memory 310 of the transmitter. CPU 308 may execute program code 312 to: (i) Receiving SCI (with field) indicating the number of contiguous RB sets; and (ii) receiving a PSSCH based on one or more RB sets, wherein the one or more RB sets are based on the number of contiguous RB sets and a location of SCI in the RB set. Further, the CPU 308 may execute the program code 312 to perform all of the described acts, steps and methods described above, below or otherwise herein.
Referring to fig. 15, with respect to such and other concepts, systems and methods of the present invention, a method 1010 for a first apparatus includes triggering or requesting a selection or reselection based on sensed resources for performing one or more PSSCH transmissions or PSCCH transmissions in a side link resource pool in an unlicensed or shared spectrum (step 1012), determining a first parameter for determining or initializing candidate multislot resources, one of which includes a set of single slot resources with the same frequency resources (step 1014), receiving SCI for reserving one or more side link resources, wherein the first apparatus excludes some candidate resources based on the reserved one or more side link resources (step 1016), selects a number of side link resources from among the active/identified/remaining candidate multislot resources after the exclusion (step 1018), and performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources (step 1020).
Preferably in some embodiments, the set of single-slot resources for the one candidate multi-slot resource has the same starting subchannel, the same number of subchannels, the same set of starting resource blocks, and the same number of RB sets. Preferably in some embodiments, the set of single-slot resources for the one candidate multi-slot resource is in the same set of RBs and has the same starting subchannel, the same number of subchannels.
Preferably in some embodiments, the first parameter is configured in the configuration of the side link resource pool, or the first parameter is determined or derived based on a priority associated with the side link data of the one or more PSSCH transmissions or PSCCH transmissions and/or the remaining PDBs, or the first parameter is determined or derived based on CAPC associated with the side link data of the one or more PSSCH transmissions or PSCCH transmissions, or the first parameter is determined or derived based on (the duration of) the COT duration, or the first parameter is determined or derived based on the CBR of the side link resource pool.
Preferably, in some embodiments, the first means for excluding some candidate resources based on the reserved one or more side link resources comprises the first means for excluding any candidate multislot resources that at least partially overlap with the reserved one or more side link resources.
Preferably, in some embodiments, the first apparatus determines or initializes candidate single-slot resources, and/or the first apparatus excludes any candidate single-slot resources that at least partially overlap with the reserved one or more side-link resources, and/or the first apparatus determines or derives valid/identified/remaining candidate single-slot resources after performing the excluding, and/or the first apparatus determines or initializes candidate multi-slot resources from the valid/identified/remaining candidate single-slot resources based on the first parameter.
Preferably, in some embodiments, the first means determines or initializes candidate multislot resources for performing the triggered or requested sensing-based resource selection or reselection when the first parameter is greater than one, and/or determines or initializes candidate monoslot resources for performing the triggered or requested sensing-based resource selection or reselection when the first parameter is one.
Preferably in some embodiments, the active/identified/remaining candidate multislot resources are in the same set of one or more RBs in the side link resource pool.
Preferably in some embodiments the side link resource pool comprises one or more RB sets, and/or the triggered or requested sensing-based resource selection or reselection is performed on a portion of the one or more RB sets in the side link resource pool, and/or the first means checks or ensures that the number of valid/identified/remaining candidate multislot resources is greater than or equal to x·m Total number of , wherein: x is a configured value or ratio and M Total number of is a total number of initialization candidate multi-slot resources in the portion of the one or more RB sets or a total number of initialization candidate single-slot resources in the portion of the one or more RB sets.
Preferably in some embodiments, the first means determines whether to identify candidate resources comprising sub-channels in more than one RB set based on whether at least a first number of sub-channels for side link data transmission is greater than (or equal to) a threshold. The first device selects a number of side link resources from the identified set of candidate resources. The first apparatus performs the one or more PSSCH transmissions or PSCCH transmissions on at least one of a selected number of side link resources.
Preferably, in some embodiments, the first apparatus identifies candidate resources comprising subchannels in more than one RB set when the first number of subchannels for side-link data transmission is greater than (or equal to) the threshold, and/or the first apparatus identifies candidate resources comprising subchannels in one RB set when the first number of subchannels for side-link data transmission is not greater than (e.g., less than or equal to) the threshold.
Preferably in some embodiments, the threshold corresponds to the number of subchannels in one RB set.
Preferably in some embodiments, the first number of sub-channels for side link data transmission is determined based on at least a maximum number of sub-channels for the PSSCH, a minimum number of sub-channels for the PSSCH, and/or a Channel Busy Ratio (CBR).
Preferably in some embodiments the first number of sub-channels for side link data transmission is a multiple integer number of at least one of two, three or a further number of (identified) more than one RB set in the side link resource pool.
Preferably, in some embodiments, when the first number of subchannels for data transmission is greater than (or equal to) the threshold, the first apparatus is not allowed to determine the first number of subchannels such that the first number of subchannels is not divisible by any of the further number of (identified) more than one RB set in the two, three or side-link resource pool (e.g., not divisible by the number of the more than one RB set).
Referring now to fig. 3 and 4, in one or more embodiments from the perspective of the first device, the device 300 includes program code 312 stored in a memory 310 of the transmitter. CPU 308 may execute program code 312 to: (i) Triggering or requesting a selection or reselection of resources based on the sensing for performing one or more PSSCH transmissions or PSCCH transmissions in a side link resource pool in an unlicensed or shared spectrum; (ii) Determining a first parameter for determining or initializing candidate multislot resources, wherein one candidate multislot resource comprises a set of single slot resources having the same frequency resource; (iii) Receiving an SCI for reserving one or more side link resources, wherein the first device excludes some candidate resources based on the reserved one or more side link resources; (iv) Selecting a number of side link resources from the valid/identified/remaining candidate multislot resources after the excluding; and (v) performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources. Further, the CPU 308 may execute the program code 312 to perform all of the described acts, steps and methods described above, below or otherwise herein.
Referring to fig. 16, with respect to such and other concepts, systems and methods of the present invention, a method 1030 for a first apparatus includes triggering or requesting a selection or reselection based on sensed resources for performing one or more PSSCH transmissions or PSCCH transmissions in a side link resource pool in an unlicensed or shared spectrum (step 1032), determining whether to identify candidate resources including subchannels in more than one RB set based on whether a first number of subchannels at least for side link data transmissions is greater than a threshold (step 1034), selecting a number of side link resources from the identified candidate resource sets (step 1036), and performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources (step 1038).
Preferably, in some embodiments, the first means identifies candidate resources comprising sub-channels in more than one RB set when the first number of sub-channels for side link data transmission is greater than a threshold, and/or the first means identifies candidate resources comprising sub-channels in one RB set when the first number of sub-channels for side link data transmission is not greater than a threshold.
Preferably in some embodiments, the threshold corresponds to the number of subchannels in one RB set.
Preferably in some embodiments, when identifying candidate resources comprising subchannel(s) in more than one RB set, the subchannel(s) in more than one RB set are associated with the same subchannel index set.
Preferably in some embodiments the side link resource pool comprises more than one RB set, and/or the triggered or requested sensing-based resource selection or reselection is performed on a portion of said more than one RB set in the side link resource pool, and/or the first means checks or ensures that the number of valid/identified/remaining candidate resources is greater than or equal to x·m Total number of , wherein: x is a configured value or ratio and M Total number of is the total number of initialization candidate resources in the portion of the more than one RB set.
Preferably in some embodiments, the first number of sub-channels for side link data transmission is determined based on at least a maximum number of sub-channels for the PSSCH, a minimum number of sub-channels for the PSSCH, and/or the CBR.
Preferably in some embodiments the first number of sub-channels for side link data transmission is a multiple integer number of at least one of the numbers of the more than one RB set in the two, three, … side link resource pools.
Preferably in some embodiments, when the first number of subchannels for the side-link data transmission is greater than the threshold, the first apparatus is not allowed to determine the first number of subchannels such that the first number of subchannels is not divisible by any of the further numbers of the more than one set of RBs in the two, three, … side-link resource pool.
Referring now to fig. 3 and 4, in one or more embodiments from the perspective of the first device, the device 300 includes program code 312 stored in a memory 310 of the transmitter. CPU 308 may execute program code 312 to: (i) Triggering or requesting a selection or reselection of resources based on the sensing for performing one or more PSSCH transmissions or PSCCH transmissions in a side link resource pool in an unlicensed or shared spectrum; (ii) Determining whether to identify candidate resources comprising subchannels in more than one RB set based on whether at least a first number of subchannels for side-link data transmission is greater than a threshold; (iii) Selecting a number of side link resources from the set of identified candidate resources; and (iv) performing the one or more PSSCH transmissions or PSCCH transmissions on at least one of the selected number of side link resources. Further, the CPU 308 may execute the program code 312 to perform all of the described acts, steps and methods described above, below or otherwise herein.
Any combination of the above concepts or teachings may be jointly combined or formed into a new embodiment. The details and embodiments disclosed may be used to solve at least (but not limited to) the problems set forth above and herein.
It should be noted that any of the methods, alternatives, steps, examples and embodiments presented 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 different ways. For example, an apparatus may be implemented or a method practiced using any number of the aspects set forth herein. Moreover, 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 concepts described above, in some aspects, parallel channels may be established based on pulse repetition frequencies. In some aspects, parallel channels may be established based on pulse positions or offsets. In some aspects, parallel channels may be established based on time hopping sequences. In some aspects, parallel channels may be established based on pulse repetition frequency, pulse position or offset, and time hopping sequence.
Those of 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 would further appreciate that the various illustrative logical blocks, modules, processors, components, 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), and various forms of program or design code with instructions (which may be referred to herein as "software" or "software modules" for convenience), 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.
Additionally, 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. An 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 code or instructions that reside within the IC, outside 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 should be understood that any particular order or hierarchy of steps in any disclosed process is an example of an example approach. It should be understood that the specific order or hierarchy of steps in the process may be rearranged based on design preferences 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. Software modules (e.g., containing executable instructions and associated data) and other data may reside in data storage such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of computer-readable storage medium known in the art. An example storage medium may be coupled to a machine, such as a computer/processor (which may be referred to herein as a "processor" for convenience), such that the processor can read information (e.g., code) from, and write information to, the storage medium. An example storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user equipment. In the alternative, the processor and the storage medium may reside as discrete components in a user device. Furthermore, in some aspects, any suitable computer program product may comprise a computer-readable medium comprising code relating to one or more of the aspects of the present disclosure. In some aspects, the computer program product may include packaging material.
While the application has been described in connection with various aspects and examples, it is to be understood that the application is capable of further modifications. This disclosure is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known and customary practice within the art to which the application pertains.
Cross Reference to Related Applications
The present application claims priority from U.S. provisional patent application No. 63/422,491, U.S. provisional patent application No. 63/422,501, U.S. provisional patent application No. 2022, U.S. provisional patent application No. 63/422,820, U.S. provisional patent application No. 2022, U.S. provisional patent application No. 11, 4; the disclosures and applications of each of which are incorporated herein by reference in their entirety.
Claims (20)
1. A method of a first apparatus, comprising:
triggering or requesting a selection or reselection of resources based on the sensing for performing one or more physical side link shared channel transmissions or physical side link control channel transmissions in a side link resource pool in an unlicensed or shared spectrum;
determining a first parameter for determining or initializing candidate multislot resources, wherein one candidate multislot resource comprises a set of single slot resources having the same frequency resource;
receiving side link control information for reserving one or more side link resources, wherein the first device excludes some candidate resources based on the reserved one or more side link resources;
selecting a number of side link resources from the valid, identified or remaining candidate multislot resources after the excluding; and
The one or more physical side link shared channel transmissions or physical side link control channel transmissions are performed on at least one of the selected number of side link resources.
2. The method of claim 1, wherein the set of single-slot resources for the one candidate multi-slot resource has a same starting subchannel, a same number of subchannels, a same set of starting resource blocks, and a same number of sets of resource blocks.
3. The method according to claim 1, characterized in that:
The first parameter is configured in the configuration of the side chain resource pool; or (b)
The first parameter is determined or derived based on a priority and/or a remaining packet delay budget associated with side-chain data of the one or more physical side-link shared channel transmissions or physical side-link control channel transmissions; or (b)
The first parameter is determined or derived based on a channel access priority class associated with side-chain data of the one or more physical side-link shared channel transmissions or physical side-link control channel transmissions; or (b)
The first parameter is determined or derived based on a channel occupancy time duration; or (b)
The first parameter is determined or derived based on a channel busy ratio of the side chain resource pool.
4. The method of claim 1, wherein the first apparatus excluding the some candidate resources based on the reserved one or more side link resources comprises the first apparatus excluding any candidate multislot resources that at least partially overlap with the reserved one or more side link resources.
5. The method according to claim 1, characterized in that:
the first device determining or initializing candidate single-slot resources; and/or
The first device excludes any candidate single-slot resources that at least partially overlap with the reserved one or more side-link resources; and/or
The first device determining or deriving valid, identified or remaining candidate single-slot resources after performing the excluding; and/or
The first device determines or initializes the candidate multislot resources from the valid, identified or remaining candidate single-slot resources based on the first parameter.
6. The method according to claim 1, characterized in that:
when the first parameter is greater than one, the first device determines or initializes the candidate multislot resources for performing the triggered or requested sensor-based resource selection or reselection; and/or
When the first parameter is one, the first device determines or initializes candidate single slot resources for performing the triggered or requested sensor-based resource selection or reselection.
7. The method of claim 1, wherein the valid, identified, or remaining candidate multislot resources are in the same set of one or more resource blocks in the side link resource pool.
8. The method according to claim 1, characterized in that:
the side chain resource pool comprises one or more resource block sets; and/or
The triggered or requested sensing-based resource selection or reselection is performed on a portion of the one or more resource block sets in the side chain resource pool; and/or
The first device checks or ensures that the number of valid, identified or remaining candidate multi-slot resources is greater than or equal to X ≡m Total number of , wherein:
X is a configured value or ratio, and
M Total number of is the total number of initialization candidate multi-slot resources in the portion of the one or more resource block sets or the total number of initialization candidate single-slot resources in the portion of the one or more resource block sets.
9. A method of a first apparatus, comprising:
triggering or requesting a selection or reselection of resources based on the sensing for performing one or more physical side link shared channel transmissions or physical side link control channel transmissions in a side link resource pool in an unlicensed or shared spectrum;
Determining whether to identify candidate resources comprising subchannels in more than one set of resource blocks based on whether at least a first number of subchannels for side-link data transmission is greater than a threshold;
selecting a number of side link resources from the identified set of candidate resources; and
The one or more physical side link shared channel transmissions or physical side link control channel transmissions are performed on at least one of the selected number of side link resources.
10. The method according to claim 9, wherein:
When the first number of subchannels for side-link data transmission is greater than the threshold, the first apparatus identifies the candidate resources comprising subchannels in more than one set of resource blocks; and/or
When the first number of subchannels for side-link data transmission is not greater than the threshold, the first apparatus identifies the candidate resources comprising subchannels in one set of resource blocks.
11. The method of claim 9, wherein the threshold corresponds to a number of subchannels in one set of resource blocks.
12. The method of claim 9, wherein when identifying candidate resources comprising subchannels in more than one set of resource blocks, the subchannels in the more than one set of resource blocks are associated with a same set of subchannel indexes.
13. The method according to claim 9, wherein:
the side chain resource pool comprises more than one resource block set; and/or
The triggered or requested sensing-based resource selection or reselection is performed on portions of the more than one set of resource blocks in the side chain resource pool; and/or
The first device checks or ensures that the number of valid, identified or remaining candidate resources is greater than or equal to x·m Total number of , wherein:
X is a configured value or ratio, and
M Total number of is the total number of initialization candidate resources in the portion of the more than one set of resource blocks.
14. The method of claim 9, wherein the first number of subchannels for side-link data transmission is determined based on at least a maximum number of subchannels for physical side-link shared channels, a minimum number of subchannels for physical side-link shared channels, and/or a channel busy ratio.
15. The method of claim 9, wherein the first number of subchannels for side-link data transmission is a multiple integer number of at least one of two, three, or yet another number of the more than one set of resource blocks in the side-link resource pool.
16. The method of claim 9, wherein the first means is not permitted to determine the first number of subchannels such that the first number of subchannels is not divisible by any one of two, three, or a further number of the more than one set of resource blocks in the side-link resource pool when the first number of subchannels for side-link data transmission is greater than the threshold.
17. A first apparatus, comprising:
A memory; and
A processor operatively coupled to the memory, wherein the processor is configured to execute program code to:
triggering or requesting a selection or reselection of resources based on the sensing for performing one or more physical side link shared channel transmissions or physical side link control channel transmissions in a side link resource pool in an unlicensed or shared spectrum;
determining a first parameter for determining or initializing candidate multislot resources, wherein one candidate multislot resource comprises a set of single slot resources having the same frequency resource;
receiving side link control information for reserving one or more side link resources, wherein the first device excludes some candidate resources based on the reserved one or more side link resources;
selecting a number of side link resources from the valid, identified or remaining candidate multislot resources after the excluding; and
The one or more physical side link shared channel transmissions or physical side link control channel transmissions are performed on at least one of the selected number of side link resources.
18. The first apparatus of claim 17, wherein the set of single-slot resources for the one candidate multi-slot resource has a same starting subchannel, a same number of subchannels, a same set of starting resource blocks, and a same number of sets of resource blocks.
19. The first apparatus of claim 17, wherein:
The first parameter is configured in the configuration of the side chain resource pool; or (b)
The first parameter is determined or derived based on a priority and/or a remaining packet delay budget associated with side-chain data of the one or more physical side-link shared channel transmissions or physical side-link control channel transmissions; or (b)
The first parameter is determined or derived based on a channel access priority class associated with side-chain data of the one or more physical side-link shared channel transmissions or physical side-link control channel transmissions; or (b)
The first parameter is determined or derived based on a channel occupancy time duration; or (b)
The first parameter is determined or derived based on a channel busy ratio of the side chain resource pool.
20. The first apparatus of claim 17, wherein:
the first device excluding the some candidate resources based on the reserved one or more side link resources includes the first device excluding any candidate multislot resources that at least partially overlap with the reserved one or more side link resources; and/or
The first device determining or initializing candidate single-slot resources; and/or
The first device excludes any candidate single-slot resources that at least partially overlap with the reserved one or more side-link resources; and/or
The first device determining or deriving valid, identified or remaining candidate single-slot resources after performing the excluding; and/or
The first device determines or initializes the candidate multislot resources from the valid, identified or remaining candidate single-slot resources based on the first parameter.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202263422820P | 2022-11-04 | 2022-11-04 | |
| US63/422,820 | 2022-11-04 | ||
| US63/422,501 | 2022-11-04 | ||
| US63/422,491 | 2022-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117998611A true CN117998611A (en) | 2024-05-07 |
Family
ID=90890104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311459789.2A Pending CN117998611A (en) | 2022-11-04 | 2023-11-03 | Method and apparatus for side link resource selection or exclusion for multiple continuous time transmissions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117998611A (en) |
-
2023
- 2023-11-03 CN CN202311459789.2A patent/CN117998611A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111356240B (en) | Method and apparatus for handling collisions between sidelink feedback and sidelink data | |
| US11444729B2 (en) | Transmitting feedback for data transmission through a sidelink | |
| KR102342393B1 (en) | Method and apparatus for handling sidelink feedback collision in a wireless communication system | |
| US11252703B2 (en) | Techniques for configuring uplink control channel transmissions in a shared radio frequency spectrum band | |
| CN112703812A (en) | NR V2X-method for data transmission in a wireless system | |
| KR20210117154A (en) | Method and apparatus for device-to-device sidelink resource selection in a wireless communication system | |
| CN114467347A (en) | COT sharing method and device in unlicensed spectrum | |
| CN114600535A (en) | New Radio (NR) vehicle-to-vehicle (V2X) method for sensing and resource allocation | |
| CN115473621A (en) | Methods, apparatuses, and computer-readable media for communicating on an uplink in a shared radio frequency spectrum band | |
| US20230064680A1 (en) | Method and apparatus for listen before talk for sidelink transmission in a wireless communication system | |
| US11825297B2 (en) | Method and apparatus of handling control signaling for inter-user equipment (UE) coordination information in a wireless communication system | |
| KR20230136562A (en) | Method and apparatus of handling sidelink feedback transmission in multiple carriers in a wireless communication system | |
| US20240163904A1 (en) | Method and apparatus for sidelink resource selection or exclusion of multi-consecutive time transmission in a wireless communication system | |
| CN117998611A (en) | Method and apparatus for side link resource selection or exclusion for multiple continuous time transmissions | |
| US20230344563A1 (en) | Method and Apparatus for Transmitting Sidelink Feedback in a Wireless Communication System | |
| US20240163920A1 (en) | Method and apparatus for sidelink transmission in a wireless communication system | |
| US11617206B2 (en) | Method and apparatus for channel access switch in a wireless communication system | |
| CN114205863B (en) | Method and apparatus for handling coordination among side link communication devices in a wireless communication system | |
| WO2023208227A1 (en) | Method related to sidelink operation in unlicensed bands, user equipment, and base station | |
| KR20240067217A (en) | Method and apparatus for sidelink resource selection or exclusion of multi-consecutive time transmission in a wireless communication system | |
| CN116743320A (en) | Method and apparatus for transmitting side link feedback in a wireless communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |