WO2024050755A1 - Transmission methods of sl on unlicensed spectrum - Google Patents

Transmission methods of sl on unlicensed spectrum Download PDF

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Publication number
WO2024050755A1
WO2024050755A1 PCT/CN2022/117800 CN2022117800W WO2024050755A1 WO 2024050755 A1 WO2024050755 A1 WO 2024050755A1 CN 2022117800 W CN2022117800 W CN 2022117800W WO 2024050755 A1 WO2024050755 A1 WO 2024050755A1
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WIPO (PCT)
Prior art keywords
capc
slot
value
symbol
channel
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PCT/CN2022/117800
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French (fr)
Inventor
Junqiang CHENG
Tao Chen
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Mediatek Singapore Pte. Ltd.
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Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2022/117800 priority Critical patent/WO2024050755A1/en
Priority to CN202311108343.5A priority patent/CN117693028A/en
Priority to EP23195903.2A priority patent/EP4336948A3/en
Priority to TW112134058A priority patent/TW202412535A/en
Priority to US18/464,094 priority patent/US20240089938A1/en
Publication of WO2024050755A1 publication Critical patent/WO2024050755A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0457—Variable allocation of band or rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0033—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation each allocating device acting autonomously, i.e. without negotiation with other allocating devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the invention discussed below relates generally to wireless communication systems, and more particularly, to transmission methods of SL on unlicensed spectrum.
  • SL-U Sidelink (SL) communications on unlicensed spectrum
  • SL-U is one of the most promising direction of SL evolution, which has the potential to address the continually increased demand of wireless data traffic.
  • SL-U As a new feature compared to legacy SL, there are many issues need to be addressed for SL-U, such as the transmission starting symbol (s) /position (s) within a slot, the determination of CAPC table/value, and the adjustment of contention window size in LBT channel access, etc.
  • the transmission methods of SL-U is presented in this disclosure.
  • the UE can start transmission at one and/or multiple position (s) within one and/or multiple (starting) symbol (s) within a slot according to the (pre-) configuration.
  • the transmission channel/signal type after LBT is finished and/or on the starting position (s) /symbol (s) can be (pre-) configured for, e.g., AGC purpose, with the content of a repetition of PSCCH/PSSCH, and/or a repetition of (dummy) data, and/or a repetition of preamble.
  • the (pre-) configuration signaling can be transmitted via SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI.
  • the DL CAPC table and/or UL CAPC table from Rel-16/Rel-17 NR-U and/or ETSI can be (pre-) configured for SL-U according to the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density.
  • the UE acts as a serving/supervising/anchor/cluster header UE, it may be (pre-) configured and/or indicated to use the DL CAPC table to have a prioritized channel access.
  • the UE may be (pre-) configured and/or indicated to use the UL CAPC table to have a deprioritized channel access.
  • the CAPC value can be determined according to the PQI and/or L1 priority according to QoS parameter of the traffic, and/or the number of the supervised/client UE (s) in the case that COT initiator acts as a supervising/anchor UE.
  • multiple consecutive slots reservation/transmission can be supported for SL-U.
  • MCSt multiple consecutive slots reservation/transmission
  • a relaxed/soft resource allocation/selection method is proposed in this disclosure. For example, based on different CAPC/priority level, and/or consecutive slots number, and/or network loading, and/or supervised UEs number, etc., different RSRP thresholds, and/or remaining resource portion requirements after resource exclusion step, and/or the operations on the excluded resources in MAC layer, etc., can be (pre-) configured.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed figures set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 illustrates an exemplary diagram of the present transmission methods of SL on unlicensed spectrum.
  • This invention is motived by, but not limited to, a scenario where SL operated on unlicensed spectrum.
  • several new features related to transmission methods of SL-U have to be addressed. For example, the design of starting symbol (s) within a slot and the starting position (s) within a (starting) symbol, the determination of DL/UL CAPC table and CAPC value, the generation of CW value, and the resource selection methods of multiple consecutive slots reservation/transmission, etc.
  • the transmission methods of SL-U are presented in this disclosure.
  • the UE before the UE can access the unlicensed channels, it should perform LBT channel access. After the LBT channel access is finished, the UE can start transmission on the channel at (pre-) configured starting position (s) /symbol (s) .
  • One and/or multiple starting symbol (s) within a slot can be (pre-) configured for the UE to start transmission.
  • one and/or multiple starting position (s) /occasion (s) within a (starting) symbol can be (pre-) configured for the UE to start transmission.
  • the UE can be (pre-) configured to use CPE operation and/or preamble to start a transmission after LBT channel access is finished in the level of microsecond.
  • the CPE and/or preamble length and/or trigger position can be (pre-) configured and/or indicated based on the CAPC value and/or PQI and/or the QoS of the traffic and/or the UE capability. For example, the smaller the CAPC value, the earlier the CPE and/or preamble operation.
  • the transmission time of preamble can be used for processing (e.g., encoding) in parallel.
  • a finer LBT sensing comprised of several finer sensing granularities (e.g., 9us sensing granularity) can be (pre-) configured within a symbol.
  • different UEs can be (pre-) configured with different finer LBT sensing lengths and start finer LBT sensing at different positions within a symbol. Consequently, the UE can start transmission at different positions within a symbol.
  • the length of the finer LBT sensing i.e., the number of the finer sensing granularity involved in the finer LBT sensing
  • the trigger time/position of the finer LBT sensing can be (pre-) configured and/or indicated based on the CAPC value and/or PQI and/or QoS of the traffic. For example, the smaller the CAPC value, the shorter the finer LBT sensing and/or the earlier the finer LBT sensing.
  • the symbol index/position of the starting symbols can be (pre-) configured.
  • the control signal/channel e.g., PSCCH
  • the control signal/channel can be sent on the specific starting symbol (s) as (pre-) configuration.
  • the control signal/channel can be (pre-) configured to be sent at only one (fixed) starting symbol, e.g., the first symbol of the slot (i.e., symbol #0 of the slot) , and/or the middle symbol of the slot (i.e., symbol #7 of the slot) .
  • only (dummy) data and/or preamble can be sent between the LBT end and the starting symbol of control signal/channel as (pre-) configuration.
  • the (starting) symbol (s) used for control signal/channel can be same or different in different slots as (pre-) configuration.
  • the control signal/channel can be transmitted on the starting symbol nearest to the LBT end as (pre-) configuration.
  • the control signal/channel can be transmitted on the first (starting) symbol of the slot as (pre-) configuration.
  • one control signal can indicate one and/or multiple data signal (s) within partial and/or one and/or multiple slot (s) .
  • This indication can be (pre-) configured with one or two additional/reserved bit (s) in control signal/channel (e.g., the 1 st SCI) . For example, if the additional new bit in 1 st SCI is “0” , it may represent that the control signal indicates the data signal within the current slot. If the additional bit in 1 st SCI is “1” , it may represent that the control signal jointly indicates both data signals within the current slot and the next slot and/or the previous slot.
  • the control signal/channel can be (pre-) configured to be sent at multiple (fixed) and/or each starting symbol (s) /position (s) .
  • the UE can be (pre-) configured to monitor control signal at one and/or multiple and/or each starting symbol (s) /position (s) within a slot as (pre-) configuration.
  • the UE may only decode (the first) M control signal (s) in one slot as (pre-) configuration.
  • the UE can be (pre-) configured to only decode one control signal in each slot. That means if the UE detects and decodes one control signal successfully in a slot, it may neglect the following starting symbol (s) /position (s) in this slot to save power and/or reduce complexity.
  • the transmission channel/signal type after LBT is finished and/or on the starting symbol (s) can be (pre-) configured as PSCCH and/or PSSCH and or AGC and/or (dummy) data and/or a preamble.
  • It can be (pre-) configured for the AGC purpose.
  • the content of AGC symbol/part can be (pre-) configured as, for example, a repetition of PSCCH/PSSCH, and/or a repetition of (dummy) data, and/or a repetition of preamble.
  • the (pre-) configuration signaling can be transmitted via SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI.
  • the AGC symbol in the following N1 slot (s) can be omitted as (pre-) configuration.
  • the value of N1 can be (pre-) configured.
  • DL CAPC table and/or UL CAPC table from Rel-16/Rel-17 NR-U and/or ETSI can be (pre-) configured for SL-U.
  • Different CAPC table can be (pre-) configured and/or indicated per UE and/or group/cluster and/or resource pool and/or RB set via the signaling of SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI.
  • the CAPC table (pre-) configuration can be based on the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density.
  • the UE acts as a serving/supervising/scheduling/anchor/cluster header UE, it may be (pre-) configured and/or indicated to use the DL CAPC table to have a prioritized channel access. Otherwise, if the UE acts as a served/supervised/scheduled/client/cluster member UE, it may be (pre-) configured and/or indicated to use the UL CAPC table to have a deprioritized channel access.
  • the serving/supervising/scheduling/anchor/cluster header UE it may be (pre-) configured to use DL CAPC table if the number of the served/supervised/scheduled/client/cluster member UE (s) larger than the corresponding threshold (s) . Otherwise, a UL CAPC table may be (per-) configured. Additionally, if the network loading/density and/or the CBR are lower than a (pre-) configured threshold (s) , the UE may be (pre-) configured and/or indicated to use the DL CAPC table.
  • the UE may be (pre-) configured and/or indicated to use the UL CAPC table. Additionally, if the COT is initiated to be (constantly) shared with several UEs larger than the (pre-) configured threshold (s) , DL CAPC table may be (pre-) configured. Otherwise, UL CAPC table may be (pre-) configured.
  • the CAPC value can be determined according to the PQI and/or L1 priority of the traffic.
  • the CAPC can be indirectly mapped from PQI and/or L1 priority with 5QI as an intermediary, and/or directly mapped from PQI and/or L1 priority with a new mapping relation between CAPC and PQI and/or L1 priority.
  • the mapping relation may take the following items into consideration like signal/channel type and/or resource type and/or default priority level and/or PDB requirement and/or packet error rate and/or default maximum data burst volume and/or default averaging window, and/or covering range.
  • the CAPC value may be determined based on the total number of the served/supervised/scheduled/client/cluster member UE (s) . For example, if the total number of the served/supervised/scheduled/client/cluster member UE (s) larger than the threshold (s) , a corresponding lower CAPC value (s) can be used.
  • a bitmap and/or table can be (pre-) configured to indicate the mapping relation between CAPC value and PQI/L1 priority and/or the total number of the served/supervised/scheduled/client/cluster member UE (s) .
  • the CAPC value for the serving/supervising/scheduling/anchor/cluster header UE can be (pre-) configured as the highest and/or lowest and/or a random value from the CAPC value set of all the served/supervised/scheduled/client/cluster member UE (s) .
  • the CW value can be chosen from a (pre-) configured CW set for each CAPC value.
  • the set can be determined according to the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density.
  • the CW set of each CAPC value in Rel-16/Rel-17 NR-U and/or ETSI can be divided into N sub-set as (pre-) configuration, e.g., a lower CW sub-set with relatively small CW value and an upper CW sub-set with relatively large CW value.
  • the value of N can be (pre-) configured.
  • the UE acts as a serving/supervising/scheduling/anchor/cluster header UE, and/or the COT is initiated to be (constantly) shared with a number of UEs larger than (pre-) configured thresholds, and/or the network loading/density and/or the CRB is lower than (pre-) configured thresholds (s)
  • the UE may (pre-) configured to set CW value from the lower CW sub-set to have a prioritized channel access. Otherwise, the UE may (pre-) configured to set CW value from the upper CW sub-set to have a deprioritized channel access.
  • the similar principle can also be applied to the random counter generation in LBT channel access procedure.
  • the UE can be (pre-) configured multiple (consecutive) slot (s) for transmission (MCSt) .
  • a relaxed/soft resource allocation method from the point of PHY layer and/or MAC layer can be (pre-) configured.
  • relaxed SL RSRP threshold (s) in the resource allocation procedure can be (pre-) configured based on CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of multiple consecutive slot (s) and/or the network loading and/or the supervised UE (s) number.
  • a bitmap and/or table can be (pre-) configured to indicate the relation between correction factor and the other items like CAPC/priority value, and/or multiple consecutive slots number and/or network loading, and/or supervised UEs number etc.
  • the portion of the candidate single-slot PSSCH resources over the total resources after resource exclusion can be (pre-) configured according to the CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of the multiple consecutive slot (s) and/or the network loading and/or the supervised UE (s) number.
  • larger portion value (s) can be added to the Rel-16/Rel-17 SL IE SL-TxPercentageConfig to guarantee multiple consecutive slot (s) reservation/transmission.
  • the new IE SL-TxPercentageConfig can be (pre-) configured as ENUMERATED ⁇ p20, p35, p50, p65, p80, p95 ⁇ .
  • the RSRP threshold can be increased with a value larger than 3dB as (pre-) configuration according to the CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of consecutive slot (s) and/or the network loading and/or the supervised UE (s) number.
  • a bitmap and/or table can be (pre-) configured to indicate the relation between the remaining resource portion and/or the RSRP threshold increased value and the other items like CAPC/priority value, and/or multiple consecutive slots number and/or network loading, and/or supervised UEs number etc.
  • a two-step resource selection method can be (pre-) configure for PHY and MAC layers. For example, for the resource (s) excluded form PHY layer after the exclusion step, MAC layer can re-select the excluded resource (s) according to the (pre-) configured criterion, and then indicate the re-selected resource (s) to PHY layer. For example, after resource exclusion in PHY layer, the related information, such as CAPC value, QoS value of the excluded resource (s) can be reported to MAC layer, then MAC layer can re-select the excluded resource (s) based on a relaxed criterion.
  • the re-selected resource (s) can be further indicated to PHY layer for use and/or for further selection.
  • the UE can be (pre-) configured to select the resource (s) reserved by other UE (s) according to the (pre-) configured criterion.
  • the AGC symbol/position can be (pre-) configured. For example, it can be (pre-) configured to be only transmitted at the first symbol of the first slot.
  • FIG. 1 An example is provided in Figure 1 to illustrate the proposed transmission methods of SL-U.
  • symbol #0, #2, #4, #6, #8, #10, #12 is (pre-) configured as the starting symbols within a slot.
  • LBT channel access stats at symbol #4 of slot #n, and end at a middle position/occasion within symbol #9 of slot #n.
  • symbol #9 is not the (pre-) configured starting symbol, UE 1 will execute CPE operation to align the boundary of symbol #10. Then an AGC symbol is transmitted on symbol #10, and (dummy) data is transmitted from symbol #11 to symbol #13 to retain the channel.
  • slot #n+1 considering the AGC symbol has already been transmitted at slot #n, it is (pre-) configured no AGC symbol at the beginning of slot #n+1 to improve spectrum efficiency.
  • the reserved/additional bit in 1 st SCI (PSCCH) of slot #n+1 is “1” , which means the 1 st SCI in slot #n+1 will jointly indicate the data signal/channel (i.e., PSSCH) in both slot #n and slot #n+1 as described previously.
  • slot #n+1 and slot #n+2 is occupied by the same UE 1, thus slot #n+1 and slot #n+2 can be regarded as multiple consecutive slots transmission (MCSt) .
  • slot #n+2 there is no guard symbol at the end of slot #n+1 and no AGC symbol at the start of slot #n+2.
  • the reserved/additional bit in 1 st SCI (PSCCH) of slot #n+2 is “0” , which means the 1 st SCI in slot #n+2 only indicates the data signal/channel (i.e., PSSCH) in the current/corresponding slot (i.e., slot #n+2) .
  • slot #n+3 is shared by UE 1 to another UE 2, thus a guard symbol is (pre-) configured at the end of slot #n+2.
  • CPE operation (occupy full guard symbol or partial guard symbol) is (pre-) configured at the guard symbol of slot #n+2 to retain the channel.
  • the AGC symbol is (pre-) configured for the transmission of UE 2.
  • the guard symbol is (pre-) configured at the end of slot #n+3 and the CPE operation is not (pre-) configured at the guard symbol of slot #n+3.
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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Abstract

This disclosure describes transmission methods of SL on unlicensed spectrum. Specifically, the transmission methods of SL-U on one and/or multiple starting symbol (s) /position (s) within a slot for both transmitter and receiver are presented. The configuration methods of CAPC table, CAPC value, and CW value for SL-U channel access are discussed. Additionally, a relaxed resource selection method is also presented in this disclosure to achieve consecutive resource reservation for SL-U.

Description

TRANSMISSION METHODS OF SL ON UNLICENSED SPECTRUM FIELD
The invention discussed below relates generally to wireless communication systems, and more particularly, to transmission methods of SL on unlicensed spectrum.
BACKGROUND
Sidelink (SL) communications on unlicensed spectrum (SL-U) is one of the most promising direction of SL evolution, which has the potential to address the continually increased demand of wireless data traffic. As a new feature compared to legacy SL, there are many issues need to be addressed for SL-U, such as the transmission starting symbol (s) /position (s) within a slot, the determination of CAPC table/value, and the adjustment of contention window size in LBT channel access, etc. To this end, the transmission methods of SL-U is presented in this disclosure.
SUMMARY
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
Various aspects of the present disclosure relate to the transmission methods of SL on unlicensed spectrum. Specifically, after the LBT channel access is finished, the UE can start transmission at one and/or multiple position (s) within one and/or multiple (starting) symbol (s) within a slot according to the (pre-) configuration. The transmission channel/signal type after LBT is finished and/or on the starting position (s) /symbol (s) can be (pre-) configured for, e.g., AGC purpose, with the content of a repetition of PSCCH/PSSCH, and/or a repetition of (dummy) data, and/or a repetition of preamble. The (pre-) configuration signaling can be transmitted via SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI.
In another aspect of the disclosure, the DL CAPC table and/or UL CAPC table from Rel-16/Rel-17 NR-U and/or ETSI can be (pre-) configured for SL-U according to the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density. For example, if the UE acts as a serving/supervising/anchor/cluster header UE, it may be (pre-) configured and/or  indicated to use the DL CAPC table to have a prioritized channel access. Otherwise, if the UE acts as a served/supervised/client/cluster member UE, it may be (pre-) configured and/or indicated to use the UL CAPC table to have a deprioritized channel access. Further, the CAPC value can be determined according to the PQI and/or L1 priority according to QoS parameter of the traffic, and/or the number of the supervised/client UE (s) in the case that COT initiator acts as a supervising/anchor UE.
In another aspect of the disclosure, multiple consecutive slots reservation/transmission (MCSt) can be supported for SL-U. To this end, a relaxed/soft resource allocation/selection method is proposed in this disclosure. For example, based on different CAPC/priority level, and/or consecutive slots number, and/or network loading, and/or supervised UEs number, etc., different RSRP thresholds, and/or remaining resource portion requirements after resource exclusion step, and/or the operations on the excluded resources in MAC layer, etc., can be (pre-) configured.
To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed figures set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an exemplary diagram of the present transmission methods of SL on unlicensed spectrum.
DETAILED DESCRIPTION
The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components,  circuits, processes, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
This invention is motived by, but not limited to, a scenario where SL operated on unlicensed spectrum. In such scenario, several new features related to transmission methods of SL-U have to be addressed. For example, the design of starting symbol (s) within a slot and the starting position (s) within a (starting) symbol, the determination of DL/UL CAPC table and CAPC value, the generation of CW value, and the resource selection methods of multiple consecutive slots reservation/transmission, etc. To this end, the transmission methods of SL-U are presented in this disclosure.
In this disclosure, before the UE can access the unlicensed channels, it should perform LBT channel access. After the LBT channel access is finished, the UE can start transmission on the channel at (pre-) configured starting position (s) /symbol (s) . One and/or multiple starting symbol (s) within a slot can be (pre-) configured for the UE to start transmission. Additionally, one and/or multiple starting position (s) /occasion (s) within a (starting) symbol can be (pre-) configured for the UE to start transmission. For example, the UE can be (pre-) configured to use CPE operation and/or preamble to start a transmission after LBT channel access is finished in the level of microsecond. Besides, the CPE and/or preamble length and/or trigger position can be (pre-) configured and/or indicated based on the CAPC value and/or PQI and/or the QoS of the traffic and/or the UE capability. For example, the smaller the CAPC value, the earlier the CPE and/or preamble operation. Note that the transmission time of preamble can be used for processing (e.g., encoding) in parallel. Additionally, a finer LBT sensing comprised of several finer sensing granularities (e.g., 9us sensing granularity) can be (pre-) configured within a symbol. Then different UEs can be (pre-) configured with different finer LBT sensing lengths and start finer LBT sensing at different positions within a symbol. Consequently, the UE can start transmission at different positions within a symbol. The length of the finer LBT sensing (i.e., the number of the finer sensing granularity involved in the finer LBT sensing) , and/or the trigger time/position of the finer LBT sensing can be (pre-) configured and/or indicated based on the CAPC value and/or PQI and/or QoS of the traffic. For example, the smaller the CAPC value, the shorter the finer LBT sensing and/or the earlier the finer LBT sensing.
For the case that more than one starting symbols within a slot are (pre-) configured, the symbol index/position of the starting symbols can be (pre-) configured. Besides, the control signal/channel (e.g., PSCCH) can be sent on the specific starting symbol (s) as (pre-) configuration. For example,  the control signal/channel can be (pre-) configured to be sent at only one (fixed) starting symbol, e.g., the first symbol of the slot (i.e., symbol #0 of the slot) , and/or the middle symbol of the slot (i.e., symbol #7 of the slot) . In this case, only (dummy) data and/or preamble can be sent between the LBT end and the starting symbol of control signal/channel as (pre-) configuration.
The (starting) symbol (s) used for control signal/channel can be same or different in different slots as (pre-) configuration. For example, for the slot that LBT is finished, the control signal/channel can be transmitted on the starting symbol nearest to the LBT end as (pre-) configuration. For the other slot (s) within the remaining COT, the control signal/channel can be transmitted on the first (starting) symbol of the slot as (pre-) configuration.
Additionally, it can be (pre-) configured that one control signal can indicate one and/or multiple data signal (s) within partial and/or one and/or multiple slot (s) . This indication can be (pre-) configured with one or two additional/reserved bit (s) in control signal/channel (e.g., the 1 st SCI) . For example, if the additional new bit in 1 st SCI is “0” , it may represent that the control signal indicates the data signal within the current slot. If the additional bit in 1 st SCI is “1” , it may represent that the control signal jointly indicates both data signals within the current slot and the next slot and/or the previous slot.
Alternatively, for the case that more than one starting symbols/positions within a slot are (pre-) configured, the control signal/channel can be (pre-) configured to be sent at multiple (fixed) and/or each starting symbol (s) /position (s) . In this case, the UE can be (pre-) configured to monitor control signal at one and/or multiple and/or each starting symbol (s) /position (s) within a slot as (pre-) configuration. Additionally, for the case that the UE is (pre-) configured to monitor more than one starting symbols/positions, the UE may only decode (the first) M control signal (s) in one slot as (pre-) configuration. For example, the UE can be (pre-) configured to only decode one control signal in each slot. That means if the UE detects and decodes one control signal successfully in a slot, it may neglect the following starting symbol (s) /position (s) in this slot to save power and/or reduce complexity.
The transmission channel/signal type after LBT is finished and/or on the starting symbol (s) can be (pre-) configured as PSCCH and/or PSSCH and or AGC and/or (dummy) data and/or a preamble. For example. It can be (pre-) configured for the AGC purpose. The content of AGC symbol/part can be (pre-) configured as, for example, a repetition of PSCCH/PSSCH, and/or a repetition of (dummy) data, and/or a repetition of preamble. The (pre-) configuration signaling can be transmitted via SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI. For the case that AGC symbol is transmitted at a middle symbol of the slot after LBT is finished, the AGC symbol in the following N1 slot (s) can be omitted as (pre-) configuration. The value of N1 can be  (pre-) configured.
In another aspect of the disclosure, DL CAPC table and/or UL CAPC table from Rel-16/Rel-17 NR-U and/or ETSI can be (pre-) configured for SL-U. Different CAPC table can be (pre-) configured and/or indicated per UE and/or group/cluster and/or resource pool and/or RB set via the signaling of SIB and/or (PC5-) RRC and/or (PC5-) MAC-CE and/or DCI and/or SCI. The CAPC table (pre-) configuration can be based on the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density. For example, if the UE acts as a serving/supervising/scheduling/anchor/cluster header UE, it may be (pre-) configured and/or indicated to use the DL CAPC table to have a prioritized channel access. Otherwise, if the UE acts as a served/supervised/scheduled/client/cluster member UE, it may be (pre-) configured and/or indicated to use the UL CAPC table to have a deprioritized channel access. Additionally, for the serving/supervising/scheduling/anchor/cluster header UE, it may be (pre-) configured to use DL CAPC table if the number of the served/supervised/scheduled/client/cluster member UE (s) larger than the corresponding threshold (s) . Otherwise, a UL CAPC table may be (per-) configured. Additionally, if the network loading/density and/or the CBR are lower than a (pre-) configured threshold (s) , the UE may be (pre-) configured and/or indicated to use the DL CAPC table. Otherwise, if the network loading/density and/or the CBR are higher than a (pre-) configured thresholds (s) , the UE may be (pre-) configured and/or indicated to use the UL CAPC table. Additionally, if the COT is initiated to be (constantly) shared with several UEs larger than the (pre-) configured threshold (s) , DL CAPC table may be (pre-) configured. Otherwise, UL CAPC table may be (pre-) configured.
In another aspect of the disclosure, the CAPC value can be determined according to the PQI and/or L1 priority of the traffic. For example, the CAPC can be indirectly mapped from PQI and/or L1 priority with 5QI as an intermediary, and/or directly mapped from PQI and/or L1 priority with a new mapping relation between CAPC and PQI and/or L1 priority. The mapping relation may take the following items into consideration like signal/channel type and/or resource type and/or default priority level and/or PDB requirement and/or packet error rate and/or default maximum data burst volume and/or default averaging window, and/or covering range. Besides, for the case that UE acts as a serving/supervising/scheduling/anchor/cluster header UE, the CAPC value may be determined based on the total number of the served/supervised/scheduled/client/cluster member UE (s) . For example, if the total number of the served/supervised/scheduled/client/cluster member UE (s) larger than the threshold (s) , a corresponding lower CAPC value (s) can be used. A bitmap and/or table can be (pre-) configured to indicate the mapping relation between CAPC value and PQI/L1 priority and/or the total number of the served/supervised/scheduled/client/cluster member  UE (s) . Additionally, the CAPC value for the serving/supervising/scheduling/anchor/cluster header UE can be (pre-) configured as the highest and/or lowest and/or a random value from the CAPC value set of all the served/supervised/scheduled/client/cluster member UE (s) .
In another aspect of the disclosure, the CW value can be chosen from a (pre-) configured CW set for each CAPC value. The set can be determined according to the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density. For example, The CW set of each CAPC value in Rel-16/Rel-17 NR-U and/or ETSI can be divided into N sub-set as (pre-) configuration, e.g., a lower CW sub-set with relatively small CW value and an upper CW sub-set with relatively large CW value. The value of N can be (pre-) configured. Next, if the UE acts as a serving/supervising/scheduling/anchor/cluster header UE, and/or the COT is initiated to be (constantly) shared with a number of UEs larger than (pre-) configured thresholds, and/or the network loading/density and/or the CRB is lower than (pre-) configured thresholds (s) , the UE may (pre-) configured to set CW value from the lower CW sub-set to have a prioritized channel access. Otherwise, the UE may (pre-) configured to set CW value from the upper CW sub-set to have a deprioritized channel access. The similar principle can also be applied to the random counter generation in LBT channel access procedure.
In another aspect of the disclosure, the UE can be (pre-) configured multiple (consecutive) slot (s) for transmission (MCSt) . To this end, a relaxed/soft resource allocation method from the point of PHY layer and/or MAC layer can be (pre-) configured. For example, relaxed SL RSRP threshold (s) in the resource allocation procedure can be (pre-) configured based on CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of multiple consecutive slot (s) and/or the network loading and/or the supervised UE (s) number. For example, a correction factor α (dB) can be added to the Rel-17/Rel-17 SL resource allocation RSRP threshold Th to obtain a new RSRP threshold for SL-U resource allocation Th′=Th+α. Then the value of correction factor α can be (pre-) configuration. For example, if CAPC value is decreased and/or the number of multiple consecutive transmission slot (s) is increased and/or the network loading is increased and/or the number of the supervised UE (s) is increased, the correction factor can be increased to the next (pre-) configured value. Otherwise, the correction factor can be decreased to the next (pre-) configured value. A bitmap and/or table can be (pre-) configured to indicate the relation between correction factor and the other items like CAPC/priority value, and/or multiple consecutive slots number and/or network loading, and/or supervised UEs number etc.
Additionally, the portion of the candidate single-slot PSSCH resources over the total resources after resource exclusion can be (pre-) configured according to the CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of the multiple  consecutive slot (s) and/or the network loading and/or the supervised UE (s) number. For example, larger portion value (s) can be added to the Rel-16/Rel-17 SL IE SL-TxPercentageConfig to guarantee multiple consecutive slot (s) reservation/transmission. An example is that the new IE SL-TxPercentageConfig can be (pre-) configured as ENUMERATED {p20, p35, p50, p65, p80, p95} . Besides, for the case that the remaining resource after resource exclusion less that the value of SL-TxPercentageConfig, the RSRP threshold can be increased with a value larger than 3dB as (pre-) configuration according to the CAPC value and/or PQI and/or L1 priority and/or the QoS of the traffic and/or the total number of consecutive slot (s) and/or the network loading and/or the supervised UE (s) number. For example, it can be increased by 6 dB each time the remaining resource after resource exclusion less that the value of SL-TxPercentageConfig. A bitmap and/or table can be (pre-) configured to indicate the relation between the remaining resource portion and/or the RSRP threshold increased value and the other items like CAPC/priority value, and/or multiple consecutive slots number and/or network loading, and/or supervised UEs number etc.
Additionally, to reserve multiple (consecutive) slot (s) for transmission, a two-step resource selection method can be (pre-) configure for PHY and MAC layers. For example, for the resource (s) excluded form PHY layer after the exclusion step, MAC layer can re-select the excluded resource (s) according to the (pre-) configured criterion, and then indicate the re-selected resource (s) to PHY layer. For example, after resource exclusion in PHY layer, the related information, such as CAPC value, QoS value of the excluded resource (s) can be reported to MAC layer, then MAC layer can re-select the excluded resource (s) based on a relaxed criterion. For example, a higher RSRP threshold according to the CAPC value. Then the re-selected resource (s) can be further indicated to PHY layer for use and/or for further selection. Additionally, the UE can be (pre-) configured to select the resource (s) reserved by other UE (s) according to the (pre-) configured criterion. For example, if the resources have already been reserved by UE B with a priority P and resource exclusion RSRP threshold Th1, then if the traffic of UE A has a higher priority than P, it can select the resources reserved by UE B with a same and/or higher resource exclusion RSRP threshold Th1 as (pre-) configuration If UE A have a lower priority than P, it cannot select the resources reserved by UE B, or it can select the resources reserved by UE B with a lower resource exclusion RSRP threshold Th2 (i.e., Th2 < Th1) as (pre-) configuration. Additionally, for multiple consecutive slots transmission, the AGC symbol/position can be (pre-) configured. For example, it can be (pre-) configured to be only transmitted at the first symbol of the first slot.
An example is provided in Figure 1 to illustrate the proposed transmission methods of SL-U. As shown in Figure 1, symbol #0, #2, #4, #6, #8, #10, #12 is (pre-) configured as the starting symbols within a slot. LBT channel access stats at symbol #4 of slot #n, and end at a middle  position/occasion within symbol #9 of slot #n. Considering symbol #9 is not the (pre-) configured starting symbol, UE 1 will execute CPE operation to align the boundary of symbol #10. Then an AGC symbol is transmitted on symbol #10, and (dummy) data is transmitted from symbol #11 to symbol #13 to retain the channel. For slot #n+1, considering the AGC symbol has already been transmitted at slot #n, it is (pre-) configured no AGC symbol at the beginning of slot #n+1 to improve spectrum efficiency. Besides, as show in Figure 1, the reserved/additional bit in 1 st SCI (PSCCH) of slot #n+1 is “1” , which means the 1 st SCI in slot #n+1 will jointly indicate the data signal/channel (i.e., PSSCH) in both slot #n and slot #n+1 as described previously. Additionally, slot #n+1 and slot #n+2 is occupied by the same UE 1, thus slot #n+1 and slot #n+2 can be regarded as multiple consecutive slots transmission (MCSt) . Correspondingly, there is no guard symbol at the end of slot #n+1 and no AGC symbol at the start of slot #n+2. Next, the reserved/additional bit in 1 st SCI (PSCCH) of slot #n+2 is “0” , which means the 1 st SCI in slot #n+2 only indicates the data signal/channel (i.e., PSSCH) in the current/corresponding slot (i.e., slot #n+2) . Additionally, in this example, slot #n+3 is shared by UE 1 to another UE 2, thus a guard symbol is (pre-) configured at the end of slot #n+2. Meanwhile, to retain the channel, CPE operation (occupy full guard symbol or partial guard symbol) is (pre-) configured at the guard symbol of slot #n+2 to retain the channel. Besides, the AGC symbol is (pre-) configured for the transmission of UE 2. Considering there is only single slot transmission of UE 2 and it is the last slot within the COT, the guard symbol is (pre-) configured at the end of slot #n+3 and the CPE operation is not (pre-) configured at the guard symbol of slot #n+3.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any  combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “UE, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”
While aspects of the present disclosure have been described in conjunction with the specific embodiments thereof that are proposed as examples, alternatives, modifications, and variations to the examples may be made. Accordingly, embodiments as set forth herein are intended to be illustrative and not limiting. There are changes that may be made without departing from the scope of the claims set forth below.

Claims (9)

  1. A transmission method for sidelink on unlicensed spectrum, wherein one and/or multiple transmission starting symbol (s) is (pre-) configured within a slot.
  2. The method of claim 1, wherein one and/or multiple transmission starting positions (s) is (pre-) configured within a symbol with a finer LBT sensing.
  3. The method of claim 2, wherein the length and trigger position of the finer LBT sensing is (pre-) configured and/or indicated based on the CAPC value and/or the QoS of the traffic.
  4. The method of claim 2, wherein the control signal/channel indicates one and/or multiple data signal (s) /channel (s) within one slot and/or across different slots with one/two additional new bit (s) in control signal/channel.
  5. The method of claim 1, wherein the CPE is used to achieve microsecond-level channel access and the CPE length and/or trigger position is (pre-) configured and/or indicated based on the CAPC value and/or the QoS of the traffic.
  6. The method of claim 1, wherein the transmission channel/signal type after LBT is finished and/or on the starting symbol (s) is (pre-) configured as PSCCH and/or PSSCH and or AGC and/or (dummy) data and/or a preamble.
  7. The method of claim 1, wherein the CAPC table and/or CAPC value and/or CW value for channel access is (pre-) configured according to the role of the COT initiator, and/or the purpose of the initiated COT, and/or the network loading/density, and/or the number of UE (s) in a cluster, and/or the PQI and/or QoS of the traffic.
  8. The method of claim 1, wherein the relaxed resource selection scheme is used in resource allocation to achieve multiple consecutive slots reservation/transmission.
  9. The method of claim 8, wherein the resource exclusion RSRP threshold, and/or the remaining resource portion after resource exclusion step, and/or the RSRP threshold increased value, and/or the operation on the excluded resources in MAC layer, and/or the candidate resources is selected can be (pre-) configured based on the CAPC/priority value, and/or consecutive slots number, and/or network loading, and/or supervised UEs number, etc.
PCT/CN2022/117800 2022-09-08 2022-09-08 Transmission methods of sl on unlicensed spectrum WO2024050755A1 (en)

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CN202311108343.5A CN117693028A (en) 2022-09-08 2023-08-30 Method and user equipment for wireless communication
EP23195903.2A EP4336948A3 (en) 2022-09-08 2023-09-07 Transmission methods of sidelink on unlicensed spectrum
TW112134058A TW202412535A (en) 2022-09-08 2023-09-07 Methods and user equipment for wireless communications
US18/464,094 US20240089938A1 (en) 2022-09-08 2023-09-08 Transmission methods of sidelink on unlicensed spectrum

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WO2022036703A1 (en) * 2020-08-21 2022-02-24 Lenovo (Beijing) Limited Method and apparatus for multiple sidelink transmission opportunities in one slot
US20220095369A1 (en) * 2020-09-23 2022-03-24 Qualcomm Incorporated Methods and system for establishing multiple starting points for sidelink transmissions
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