WO2023151011A1 - Methods and apparatus of cot sharing in sidelink unlicensed communication systems - Google Patents

Methods and apparatus of cot sharing in sidelink unlicensed communication systems Download PDF

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Publication number
WO2023151011A1
WO2023151011A1 PCT/CN2022/075989 CN2022075989W WO2023151011A1 WO 2023151011 A1 WO2023151011 A1 WO 2023151011A1 CN 2022075989 W CN2022075989 W CN 2022075989W WO 2023151011 A1 WO2023151011 A1 WO 2023151011A1
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Prior art keywords
cot
stage sci
information
scheduling
sci
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PCT/CN2022/075989
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English (en)
French (fr)
Inventor
Junqiang CHENG
Tao Chen
Min LEI
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Mediatek Singapore Pte. Ltd.
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Priority to PCT/CN2022/075989 priority Critical patent/WO2023151011A1/en
Priority to CN202310111841.9A priority patent/CN116634584A/zh
Priority to PCT/CN2023/075451 priority patent/WO2023151663A1/en
Priority to TW112104724A priority patent/TW202333526A/zh
Publication of WO2023151011A1 publication Critical patent/WO2023151011A1/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]
    • H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates generally to wireless communication systems, and more particularly, the methods and apparatus of COT sharing for sidelink transmissions on unlicensed frequency bands in a wireless communication system.
  • Sidelink communication refers to the direct communication between two terminal devices without the data going through the network. Since the first version of sidelink is introduced in 3GPP Release 12 as device-to-device (D2D) communication, the scope of sidelink communication has been evolved to LTE based vehicle-to-everything (V2X) and NR based V2X through 3GPP Release 14 to Release 17. Obviously, the critical role of sidelink communication in LTE and NR has made it an inevitable remedy to support numerous use cases in the future wireless communication networks. On the other hand, in order to address the rapid increase of wireless network traffic load demand in the upcoming years, the utilization of unlicensed frequency bands has drawn a lot of attention from both academic and industry. Therefore, the design of sidelink communication on unlicensed frequency bands, i.e., SL-U, is regarded as one of the most promising directions for future sidelink research.
  • SL-U unlicensed frequency bands
  • the fair and harmonious coexistence among different radio access technologies is considered as one of the most significant issues.
  • the utilization of listen before talk/transmission (LBT) is mandated before a device accesses the unlicensed channel. If the LBT is successful, the device can access the unlicensed channel for a period, which is referred to the channel occupancy time (COT) .
  • COT channel occupancy time
  • NR-U NR unlicensed communication
  • the COT can be used by the initiating device to transmit traffic, and can also be shared with the responding devices to achieve a higher spectral efficiency and faster response under bidirectional transmissions.
  • the COT information should be first transmitted to other devices in the group after the LBT is successful.
  • the scheduling information including the channel access type, cyclic prefix (CP) extension, and also the channel access priority type (CAPC) , etc., may also be transmitted from the initiating device to the responding devices.
  • the present disclosure gives some methods and apparatus to solve the issues about COT sharing in SL-U, including the different use cases of COT sharing, the COT sharing information, the COT sharing signals/channels, the scheduling information, and the scheduling signals/channels, etc.
  • every SL-U device is configured to perform LBT before it can access the unlicensed channels. If the LBT is successful, the unlicensed channel can be utilized by the initiating device for a period, i.e., a COT. Besides, the initiating device can share the COT with responding devices, then the shared COT can be used by the responding devices to communicate with the initiating device. Moreover, the shared COT can also be used by the responding devices to communicate with other devices. for the case of COT sharing, the power control should be configured for the responding devices.
  • the COT information after the COT is initiated by an initiating device, the COT information, including COT location, COT duration, etc., should be transmitted to other SL-U devices in a group.
  • the COT sharing signals/channels can be carried in the 1 st -stage sidelink channel information (SCI) /physical sidelink control channel (PSCCH) .
  • the COT sharing signals/channels can be carried in the 1 st -stage SCI with a new format, where the information of the original sidelink 1 st -stage SCI and the information of COT are both included.
  • the COT sharing signals/channels can be configured as the 1 st -stage SCI with a new format, where only the information of COT is included.
  • Both approaches can be applied depending on whether both the legacy 1 st SCI and COT info are multiplexed for transmission together.
  • the new 1 st SCI format can be introduced to include both COT info and the original 1 st SCI contents.
  • the independent SCI format can be applied to mainly include COT-only info (w/o need of sensing info in 1 st SCI) .
  • the transport block size (TBS) determination may need to exclude the overhead caused by the COT info transmission.
  • the format indicator in SCI can be introduced for identification.
  • the (1 st ) SCI sizes for the multiplexed transmission and COT-only info transmission e.g., no sensing info in 1 st SCI
  • the SCI size for the multiplexed transmission and COT-only info transmission can be same, differentiated by a format indicator in the SCI for interpretation of the contents.
  • the COT sharing signals/channels can be carried in the 2 nd -stage SCI/physical sidelink shared channel (PSSCH) , where the information of the original 2 nd -stage SCI and the information of COT are both included.
  • the 2 nd -stage SCI should be configured so that all the responding devices in the group can decode it to obtain the COT information.
  • a format indicator in 1 st SCI to indicate a new 2 nd SCI format can be introduced to identify whether COT info is carried in 2 nd SCI.
  • a format indicator in the 2 nd SCI can be introduced for identification of this new format if it is sharing with the existing 2 nd SCI format size.
  • the SCI carrying mainly COT info can be used by sharing the same SCI format size as 1 st SCI carrying sensing information. In such way, the 1 st SCI size can be smaller (either carrying sensing info or COT info) with the same format size to reduce blind detection.
  • the COT sharing signals/channels can be carried in the 2 nd -stage SCI/PSSCH, where the information of the original 2 nd -stage SCI and the information of COT are both included.
  • the 2 nd -stage SCI should be configured so that all the responding devices in the group can decode it to obtain the COT information.
  • the COT sharing signals/channels can be carried in the 1 st -stage SCI with a new format/PSCCH, where only the information of COT is included.
  • one new bit is added to the original sidelink 1 st -stage SCI at the starting position of the slot. This new bit is used to indicate whether the COT information is carried on the 1 st -stage SCI with new format, or the 2 nd -stage SCI as mentioned above.
  • the responding device should perform channel access mechanism before it can access the COT.
  • the channel access mechanism can be configured from Type 1 LBT, Type 2A LBT, Type 2B LBT and Type 2C LBT.
  • the type of LBT can refer to 3GPP spec for NR-U.
  • the channel access type can be determined by the responding device according to the transmission gap.
  • the channel access type can be scheduled by the initiating device. For this case, besides channel access type, the scheduling information may also include CP extension configuration, CAPC configuration, etc.
  • the scheduling signals/channels can be carried in the 2 nd -stage SCI/PSSCH, where the information of the original 2 nd -stage SCI and the information of scheduling are both included.
  • the responding device is configured to monitor the scheduling signal, i.e., the 2 nd -stage SCI. After decoding the 2 nd -stage SCI, the responding device can obtain the original 2 nd -stage SCI information, which can be used to guide the reception of the data from the initiating device. Besides, the responding device can also obtain the scheduling information of channel access type, CP extension, etc., which can indicate the channel access procedures for the responding device to access the shared COT.
  • the scheduling signals/channels can be carried in both the 1 st -stage SCI with a new format/PSCCH and the 2 nd -stage SCI/PSSCH.
  • the scheduling signals/channels can be carried in the 2 nd -stage SCI/PSSCH, where the information of the original 2 nd -stage SCI and the information of the scheduling are both included.
  • the scheduling signals/channels can be carried in the 1 st -stage SCI with a new format/PSCCH, where only the information of scheduling is included.
  • the 1 st -stage SCI with new format should be configured so that only the ideal device can decode it.
  • one new bit is added to the original sidelink 1 st -stage SCI at the starting position of the slot. This new bit is used to indicate whether the scheduling information is carried on the 1 st -stage SCI with new format, or the 2 nd -stage SCI as mentioned above.
  • the sub-channel size can be set as 20MHz to be aligned with the resource set of the other RAT (like WIFI) for co-existence.
  • the sub-channel can be comprised of interlaced RBs or interlaced RB sets.
  • the 1 st SCI transmission can be fixed or (pre-) configured in the one sub-channel (e.g., the first sub-channel) within 20MHz resource set. It can avoid blind detection at SL-U UE supposing the UE will typically occupy one resource set in the unlicensed spectrum with LBT bandwidth of 20MHz.
  • multiple UEs can be scheduled simultaneously by scheduling UE or COT initiated UE.
  • the SCI may not need to be transmitted for the scheduled UE when transmitting the data at the scheduled resource (or preferred resources) indicated by the scheduling UE.
  • Whether the 1 st and/or 2 nd SCI should be transmitted associated with the data by the scheduled UE or not can be up to (pre-) configuration.
  • the scheduling grant to schedule multiple UEs (or signaling to indicate the preferred resources to multiple UEs for transmission) can be sent via single SCI and/or MAC-CE to include multiple scheduling info (or preferred resource info) corresponding to the multiple UEs.
  • a bit map can be used to indicate which UE is scheduled and the corresponding field in (2 nd ) SCI and/or MAC-CE will be used to further indicate the scheduling info (or preferred resource info) of each scheduled UE.
  • the new SCI format and/or SCI format indicator can be introduced. Whether such new format is supported within a COT for scheduling a group of UEs can be up to (pre-) configuration or an indicator in the COT info.
  • the scheduling or COT initiated UE can send multiple SCIs on the different sub-channels to the multiple UEs, in this case, the (potential) scheduled UEs or the UEs sharing the same COT should monitor SCI in the multiple sub-channels in addition to the first sub-channel.
  • the UEs sharing the COT or the (potential) scheduled UEs should monitor the multiple sub-channels or only the first sub-channel can be up to (pre-) configuration or an indicator in the COT info.
  • COT info can carry information about the starting offset, COT duration, configuration for the behavior within the COT, the slot/resource configuration within the COT (slot/resource for the scheduling UE (and/or COT initiated UE) and the slot/resource for the scheduled UEs (and/or COT sharing UEs) , PSFCH time/frequency resource allocation within the COT.
  • the bitmap can be used to indicate each slot (w/one or two bits in the bitmap) within the COT duration is reserved for scheduling UE (and/or COT initiated UE) or the scheduled UEs (and/or COT sharing UEs) .
  • the flexible slot may be supported via the indication in the bitmap.
  • the flexible slot can be further indicated by a SCI or derived by the time relation (e.g., scheduling PSCCH/PSSCH-PSFCH A/N timing, scheduling PSCCH-scheduled PSSCH timing) to determine/overwrite the slot for transmission of the scheduling UE (and/or COT initiated UE) or for transmission of scheduled UE (and/or COT sharing UE) .
  • time relation e.g., scheduling PSCCH/PSSCH-PSFCH A/N timing, scheduling PSCCH-scheduled PSSCH timing
  • the transmission power of the scheduling UE can be indicated via COT info or scheduling grant for the scheduled UE to derive the pathloss for power control.
  • 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 of the relation between LBT and COT.
  • FIG. 2 (a) illustrates an exemplary that the shared COT is utilized by the responding device to communicate with the initiating device.
  • FIG. 2 (b) illustrates an exemplary that the shared COT is utilized by the responding device to communicate with other devices in the group.
  • FIG. 3 (a) illustrates a power control scheme based on the pathloss between the initiating device and the responding device, where the responding device is far away from the initiating device in the case that the shared COT is used by the responding device to communicate with other devices in the group.
  • FIG. 3 (b) illustrates a power control scheme based on the pathloss between the initiating device and the responding device, where the responding device is near the initiating device in the case that the shared COT is used by the responding device to communicate with other devices in the group.
  • FIG. 3 (c) illustrates a power control scheme based on the pathloss between the responding device and the other devices in the case that the shared COT is used by the responding device to communicate with other devices in the group.
  • FIG. 4 (a) illustrates an exemplary of COT sharing signals/channels design where the COT sharing signals/channels is carried in the 1 st -stage SCI with new format/PSCCH no matter the COT in initiated at the starting position of the slot or not.
  • FIG. 4 (b) illustrates an exemplary of COT sharing signals/channels design where the COT sharing signals/channels is carried in the 2 nd -stage SCI/PSSCH no matter the COT in initiated at the starting position of the slot or not.
  • FIG. 4 (c) illustrates an exemplary of COT sharing signals/channels design where the COT sharing signals/channels is carried in the 2 nd -stage SCI/PSSCH if the COT is initiated at the starting position of the slot, and is carried in the1 st -stage SCI with new format/PSCCH if the COT is not initiated at the starting position of the slot.
  • FIG. 5 illustrates an exemplary of the channel access type determination according to the transmission gap at the responding device side.
  • FIG. 6 (a) illustrates an exemplary of the scheduling signals/channels design where the scheduling signals/channels is carried in the 2 nd -stage SCI/PSSCH no matter the scheduling information is transmitted at the starting position of the slot or not.
  • FIG. 6 (b) illustrates an exemplary of the scheduling signals/channels design where the scheduling signals/channels is carried in the 2 nd -stage SCI/PSSCH if the scheduling information is transmitted at the starting position of the slot, and is carried in the 1 st -stage SCI with new format/PSCCH if the scheduling information is not transmitted at the starting position of the slot.
  • the described invention operates in the context of sidelink communications on unlicensed frequency bands (SL-U) .
  • RATs radio access technologies
  • NR-U NR unlicensed communications
  • Wi-Fi Wi-Fi
  • the devices want to access the unlicensed frequency bands should perform a channel access procedure, i.e., LBT, to make sure that the unlicensed channels are idle.
  • LBT channel access procedure
  • the LBT if the LBT is failed, the device cannot access the unlicensed channels. If the LBT is successful, the device can access the unlicensed channels in the following duration, which is referred to the channel occupancy time (COT) .
  • COT channel occupancy time
  • the energy detection duration of LBT and the COT duration are both determined by the CAPC of the traffic.
  • the COT initiated after a successful LBT it can be utilized by the initiating device to transmit traffic.
  • the COT can also be shared with the responding devices to improve the spectrum efficiency and decrease the latency under bidirectional transmissions.
  • the responding device can use the shared COT to communication with the initiating device.
  • the responding device can use the shared COT to transmit acknowledgement (ACK) or negative acknowledgement (NACK) if a physical sidelink feedback channel (PSFCH) is (pre-) configured.
  • the responding device can use the shared COT to transmit traffic on a physical sidelink shared channel (PSSCH) .
  • the responding device can use the shared COT to communicate with other devices in the group.
  • the sidelink power control mechanism should be configured for the responding device.
  • the power control can be based on the pathloss between the COT initiating device and the responding device. This allows compensating the attenuation in the unlicensed sidelink channels between the COT initiating device and the responding device.
  • the power control can be configured to use the pathloss between the COT initiating device and the responding device only, or the pathloss between the responding device and the other devices only, or both the pathloss between the initiating device and responding device, and the pathloss between the responding device and the other devices.
  • the responding device near the initiating device may transmit traffic at a lower power than the responding device far away from the initiating device.
  • the responding devices that is far away from the initiating device may transmit traffic at a larger power than necessary.
  • the responding device that is near the initiating device may transmit traffic at a lower power than necessary.
  • the pathloss between the initiating device and the responding device can be derived at the responding device based on the measurements of reference signals sent by the initiating device.
  • the power control can be configured to use the pathloss between the responding device and the other devices only.
  • this scheme allows compensating the attenuation in the unlicensed sidelink channel between the responding device and the other devices. As a result, this may avoid that a responding device transmits at larger or lower power as mentioned in the previous scheme.
  • the responding device requires an estimation of the pathloss that can be obtained from the feedback of the received signal reference power (RSRP) measured at the other device side.
  • RSRP received signal reference power
  • the power control can be configured to use both the pathloss between the initiating device and the responding device, and the pathloss between the responding device and the other devices.
  • a damping factor can be configured to adjust the contributions of the two pathloss types to the total power control.
  • the responding device needs to measure the reference signals sent by the initiating device to drive the pathloss between the initiating device and the responding device. Besides, the responding device also needs the feedback of the RSRP measured at the other device side to drive the pathloss between the responding device and the other device.
  • the initiating device should deliver the COT sharing information or channel occupancy indicator (COI) to the other devices in the group.
  • COT sharing information can include the COT duration, the COT location, etc.
  • the COT sharing signals/channels can be carried in, for example, the 1 st -stage SCI/PSCCH with a new format.
  • the COT sharing signals/channels can be carried in the 1 st -stage SCI/PSCCH with a new format where both the information of the original sidelink 1 st -stage SCI and the information of COT are included.
  • the COT sharing signals/channels can be carried in 1 st -stage SCI with a new format/PSCCH, where only the information of COT is included. . Both approaches can be applied depending on whether both the legacy 1 st SCI and COT info are multiplexed for transmission together.
  • the new 1 st SCI format can be introduced to include both COT info and the original 1 st SCI contents.
  • the independent SCI format can be applied to mainly include COT-only info (w/o need of sensing info in 1 st SCI) .
  • the responding devices in the group can be configured to monitor the 1 st -stage SCI per symbol.
  • the responding devices detect the 1 st -stage SCI at the staring position of a slot, it can obtain the information such as sidelink traffic priority, the resource reservation period, the reserved resources position, etc., and also the COT information if the COT is initiated at the slot starting position. If the responding devices detect the 1 st -stage SCI at a position within the slot other than the starting position, it can obtain the COT information.
  • the responding devices can be configured to monitor 1 st -stage SCI only to obtain the COT information, but if there is no initiated COT, or the COT is not initiated at the starting position of the slot, there may be a waste for the bits reserved for the COT information in the 1 st -stage SCI.
  • the CP extension and timing advanced (TA) operation can be configured to align the boundary of the COT and the symbol as described in Figure 4 (a) .
  • the COT sharing signals/channels can be carried in the 2 nd -stage SCI/PSSCH where the information of the original 2 nd -stage SCI and the information of COT are both included.
  • the 2 nd -stage SCI should be configured so that all the responding devices in the group can decode it to obtain the COT information.
  • the responding devices in the group can be configured to monitor the 2 nd -stage SCI per symbol. If the responding devices detect the 2 nd -stage SCI, it can obtain the information such as HAQR process ID, the source ID, the destination ID, etc., and also the COT information if there is an initiated COT.
  • the responding devices can be configured to monitor 2 nd -stage SCI only, but for the 2 nd -stage SCI without COT information, there may be a waste for the bits reserved for the COT information.
  • the CP extension and TA operation can be configured to align the boundary of the COT and the symbol as described in Figure 4 (b) .
  • the COT sharing signals/channels can be carried in both the 1 st -stage SIC/PSCCH and the 2 nd -stage SCI/PSSCH.
  • the COT information can be carried on the 2 nd -stage SCI, where the information of the original 2 nd -stage SCI and the information of COT are both included.
  • the COT information can be carried on the 1 st -stage SCI with a new format, where only the information of COT is included. In this scheme, one new bit is added to the original sidelink 1 st -stage SCI at the slot starting position.
  • This new bit is used to indicate whether the COT information is carried on the 1 st -stage SCI with new format, or the 2 nd -stage SCI as mentioned above.
  • the responding devices can be configured to monitor the COT sharing signals/channels per symbol.
  • the new added bit in the original 1 st -stage SCI is configured to, for example, ‘0’ , which indicates the COT sharing signal/channel is the 2 nd -stage SCI, and the responding device should decode the 2 nd -stage SCI to obtain the COT information.
  • the new added bit in the original 1 st -stage SCI is configured to, for example, ‘1’ , which indicates the COT sharing signal/channel is the 1 st -stage SCI with a new format.
  • the responding device can obtain the COT information by decoding the new 1 st -stage SCI within the slot.
  • the CP extension and TA operation can be configured to align the boundary of the COT and the symbol as described in Figure 4 (c) .
  • the channel access type can be configured from Type 1 LBT, Type 2A LBT, Type 2B LBT and Type 2C LBT.
  • the type of LBT can refer to 3GPP spec for NR-U.
  • the channel access type can be determined by the responding device according to the transmission gap. For example, if the gap is up to 16 ⁇ s, the responding device can transmit the traffic on the shared COT after performing Type 2C LBT channel access procedures. If the gap is 25 ⁇ s or 16 ⁇ s, the responding device can transmit the traffic on the shared COT after performing Type 2A LBT or Type 2B LBT channel access procedures, respectively.
  • the channel access type performed by the responding device can be scheduled by the initiating device.
  • the scheduling information can be configured to include channel access type, CP extension configuration, and also the CAPC configuration, etc.
  • the scheduling signals/channels can be carried in the 2 nd -stage SCI/PSSCH, where the information of the original 2 nd -stage SCI and the information of scheduling are both included.
  • the responding device can be configured to monitor the 2 nd -stage SCI per symbol. If the responding device detects the 2 nd -stage SCI, it can obtain the information of the original 2 nd -stage SCI, including HAQR process ID, the source ID, the destination ID, etc., and may also the information of scheduling.
  • the CP extension and TA operation can be configured to align the boundary of the COT and the symbol as described in Figure 6 (a) .
  • the scheduling signals/channels can be carried in both 1 st -stage SIC/PSCCH and 2 nd -stage SCI/PSSCH.
  • the scheduling signal/channel can be carried in the 2 nd -stage SCI/PSSCH, where the information of the original 2 nd -stage SCI and the information of scheduling are both included.
  • the scheduling signal/channel can be carried in the 1 st -stage SCI with a new format/PSCCH, where only the information of scheduling is included.
  • one new bit is added to the original sidelink 1 st -stage SCI at the starting position of the slot.
  • This new bit is used to indicate whether the scheduling information is carried on the 1 st -stage SCI with new format or the 2 nd -stage SCI as mentioned above.
  • the responding device can be configured to monitor the scheduling signals per symbol.
  • the new added bit in the original 1 st -stage SCI can be carried in, for example, ‘0’ , which indicates the scheduling signal/channel is the 2 nd -stage SCI/PSSCH, and the responding device should decode the 2 nd -stage SCI to obtain the scheduling information.
  • the new added bit in the original 1 st -stage SCI is configured to, for example, ‘1’ , which indicates the scheduling signal/channel is the 1 st -stage SCI with a new format/PSCCH.
  • the responding device can obtain the scheduling information by decoding the new 1 st -stage SCI within the slot.
  • the CP extension and TA operation can be configured to align the boundary of the COT and the symbol as described in Figure 6 (b) .
  • the sub-channel size can be set as 20Mhz to be aligned with the resource set of the other RAT (like WIFI) for co-existence.
  • the 1st SCI transmission can be fixed or (pre-) configured in the one sub-channel (e.g., the first sub-channel) within 20MHz resource set. It can avoid blind detection at SL-U UE supposing the UE will typically occupy one resource set in the unlicensed spectrum with LBT bandwidth of 20MHz.
  • the scheduling grant to schedule multiple UEs can be sent via single SCI and/or MAC-CE to include multiple scheduling info (or preferred resource info) corresponding to the multiple UEs.
  • a bit map can be used to indicate which UE is scheduled and the corresponding field in (2nd) SCI and/or MAC-CE will be used to further indicate the scheduling info (or preferred resource info) of each scheduled UE.
  • the new SCI format and/or SCI format indicator can be introduced. Whether such new format is supported within a COT for scheduling a group of UEs can be up to (pre-) configuration or an indicator in the COT info.
  • the scheduling or COT initiated UE can send multiple SCIs on the different sub-channels to the multiple UEs, in this case, the (potential) scheduled UEs or the UEs sharing the same COT should monitor SCI in the multiple sub-channels in addition to the first sub-channel.
  • the UEs sharing the COT or the (potential) scheduled UEs should monitor the multiple sub-channels or only the first sub-channel can be up to (pre-) configuration or an indicator in the COT info.
  • COT info can carry information about the starting offset, COT duration, configuration for the behavior within the COT, the slot/resource configuration within the COT (slot/resource for the scheduling UE (and/or COT initiated UE) and the slot/resource for the scheduled UEs (and/or COT sharing UEs) , PSFCH time/frequency resource allocation within the COT.
  • the bitmap can be used to indicate each slot (w/one or two bits in the bitmap) within the COT duration is reserved for scheduling UE (and/or COT initiated UE) or the scheduled UEs (and/or COT sharing UEs) .
  • the flexible slot may be supported via the indication in the bitmap.
  • the flexible slot can be further indicated by a SCI or derived by the time relation (e.g., scheduling PSCCH/PSSCH-PSFCH A/N timing, scheduling PSCCH-scheduled PSSCH timing) to determine/overwrite the slot for transmission of the scheduling UE (and/or COT initiated UE) or for transmission of scheduled UE (and/or COT sharing UE).
  • a SCI scheduling PSCCH/PSSCH-PSFCH A/N timing, scheduling PSCCH-scheduled PSSCH timing
  • the transmission power of the scheduling UE can be indicated via COT info or scheduling grant for the scheduled UE to derive the pathloss for power control.
  • 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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PCT/CN2022/075989 2022-02-11 2022-02-11 Methods and apparatus of cot sharing in sidelink unlicensed communication systems WO2023151011A1 (en)

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CN202310111841.9A CN116634584A (zh) 2022-02-11 2023-02-04 信道占用时间共享方法及其用户装置
PCT/CN2023/075451 WO2023151663A1 (en) 2022-02-11 2023-02-10 Methods and apparatus of channel occupancy time (cot) sharing in sidelink unlicensed communication systems
TW112104724A TW202333526A (zh) 2022-02-11 2023-02-10 通道佔用時間共用方法及其使用者設備

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