EP4662940A1 - Amélioration de ssb sl-u dans une opération à large bande - Google Patents

Amélioration de ssb sl-u dans une opération à large bande

Info

Publication number
EP4662940A1
EP4662940A1 EP23920513.1A EP23920513A EP4662940A1 EP 4662940 A1 EP4662940 A1 EP 4662940A1 EP 23920513 A EP23920513 A EP 23920513A EP 4662940 A1 EP4662940 A1 EP 4662940A1
Authority
EP
European Patent Office
Prior art keywords
ssb
resource block
bandwidth part
frequency
block set
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
Application number
EP23920513.1A
Other languages
German (de)
English (en)
Inventor
Siyi Chen
Jing Sun
Xiaoxia Zhang
Chih-Hao Liu
Changlong Xu
Shaozhen GUO
Luanxia YANG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of EP4662940A1 publication Critical patent/EP4662940A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092—Indication of how the channel is divided
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the techniques described herein relate to an apparatus, wherein the center frequency of the SL-SSB occasion is further based on an offset from a start of a step.
  • the techniques described herein relate to an apparatus, wherein the plurality of SL-SSB occasions includes one SL-SSB occasion in each of the other resource block sets within the bandwidth part.
  • the techniques described herein relate to an apparatus, wherein the indication includes a bitmap indicating whether each of the other resource block sets within the bandwidth part, starting from a resource block set in a frequency channel above the reference resource block set and wrapping around to lower frequency channels, includes a SL-SSB occasion.
  • the techniques described herein relate to an apparatus, wherein to transmit the SL-SSB on one or more of the plurality of SL-SSB occasions, the processor is configured to execute the instructions to transmit the SL-SSB on consecutive resource block sets.
  • the techniques described herein relate to an apparatus, wherein to transmit the SL-SSB on one or more of the plurality of SL-SSB occasions, the processor is configured to execute the instructions to select one of the SL-SSB occasions that satisfies the LBT condition for transmitting the SL-SSB.
  • the techniques described herein relate to a method of wireless communication, including: receiving, at a wireless device, an indication of a frequency location of a sidelink synchronization signal block (SL-SSB) within a bandwidth part of a shared frequency band; and transmitting or receiving, at the wireless device, the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location, wherein the reference resource block set of the SL-SSB is within a first 20-MHz channel separated from another channel in the bandwidth part by a guard band.
  • SL-SSB sidelink synchronization signal block
  • the techniques described herein relate to a method of wireless communication for a base station, including: transmitting an indication of a frequency location of a reference sidelink synchronization signal block (SL-SSB) occasion within a bandwidth part of a shared frequency band.
  • SL-SSB reference sidelink synchronization signal block
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings 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. 2D is a diagram illustrating an example of uplink channels within a 5G NR subframe.
  • FIG. 3 is a diagram of an example of a first wireless communication device in communication with a second wireless communication device.
  • FIG. 4 is a diagram of an example of resource block (RB) sets for communications between wireless communication devices.
  • RB resource block
  • FIG. 5 is a diagram illustrating an example of sidelink synchronization signal block (SL-SSB) occasions within RB sets for communications between wireless communication devices such as UEs.
  • SL-SSB sidelink synchronization signal block
  • FIG. 6 is a message diagram illustrating example messages between a base station and one or more UEs.
  • FIG. 7 is a resource diagram illustrating a bitmap for indicating whether each of the resource block sets within the bandwidth part includes a SL-SSB occasion.
  • FIG. 8 is a resource diagram illustrating a bitmap for indicating whether the non-reference RB sets within the bandwidth part include a SL-SSB occasion.
  • FIG. 9 is a conceptual data flow diagram illustrating the data flow between different means/components in an example UE including a SL-SSB component.
  • FIG. 10 is a flowchart of an example method for operating a UE for transmitting or receiving a SL-SSB.
  • SSBs synchronization signal blocks
  • sidelink communications which may also be referred to as direct link communications.
  • a direct link refers to a direct wireless communications path from a first wireless device to a second wireless device.
  • a direct link between two user equipment (UEs) may be referred to as a sidelink (SL) , as opposed to communications over the Uu interface (e.g., from gNB to user equipment (UE) .
  • Direct links may be utilized in D2D communication technologies that can include vehicle-to-vehicle (V2V) communications, vehicle-to-infrastructure (V2I) communications (e.g., from a vehicle-based communication device to road infrastructure nodes) , vehicle-to-network (V2N) communications (e.g., from a vehicle-based communication device to one or more network nodes, such as a base station) , a combination thereof and/or with other devices, which can be collectively referred to as vehicle-to-anything (V2X) communications.
  • V2X vehicle-based communication devices can communicate with one another and/or with infrastructure devices over a direct link channel.
  • the described features relate to a sidelink SSB in an unlicensed band or shared spectrum.
  • Shared spectrum may refer to a portion of spectrum that devices belonging to different networks are allowed to access.
  • the shared spectrum may be referred to as unlicensed spectrum or an unlicensed band.
  • Sidelink communications on such shared spectrum may be referred to as SL-U.
  • a general license may apply to shared spectrum.
  • a listen before talk (LBT) or channel assessment (CA) procedure may be applicable to communications in shared spectrum.
  • a SSB may carry information for identifying a device and allowing other devices to synchronize with the device. For example, in 5G NR, a base station may transmit a SSB on one or more beams. User equipment (UEs) may determine a cell identifier (ID) based on the SSB. The SSB may also include a broadcast channel (BCH) that allows the UEs to locate system information. Similarly, in sidelink communications, a UE may transmit an SSB to identify the UE and provide information about services offered by the UE.
  • BCH broadcast channel
  • shared spectrum offers the potential to expand available resources for sidelink communications. For example, large portions of spectrum may be designated as shared spectrum between frequency range 1 (FR1) and frequency range 2 (FR2) (e.g., 5.9 GHz –7.1 GHz) , within FR2, or at higher frequencies. Shared spectrum, however, presents several technical difficulties in transmitting sidelink SSBs.
  • shared spectrum may utilize basic channel units of 20 MHz.
  • the basic channel units may include a resource block (RB) set separated from another basic channel unit by an intra-cell guard band, which may vary in size depending on capabilities of different UEs.
  • RB resource block
  • ARFCN values of 600,000 to 2,016,666 may indicate frequencies in the frequency range 3000 MHz to 24,260 MHz. As noted above, however, only some frequency locations may be used for SL-SSBs, so dedicating a large number of bits for signaling large ARFCN values to indicate an SL-SSB location may be inefficient. Third, the LBT or CA mechanisms for shared spectrum may delay or prevent transmission of an SL-SSB on a specific RB set.
  • a UE may receive an indication of a frequency location of the SL-SSB within a bandwidth part of a shared frequency band. For instance, the indication may be received in a radio resource control (RRC) message transmitted by a base station or another UE.
  • RRC radio resource control
  • the indication may specify the frequency location of a reference resource block set.
  • the reference resource block set may be separated from another channel in the bandwidth part by a guard band.
  • the UE may transmit or receive the SL-SSB on a SL-SSB occasion based on the reference resource block set.
  • the SL-SSB occasion may be within a common minimum resource block set.
  • the UE may attempt to transmit or receive the SL-SSB on multiple SL-SSB occasions to improve likelihood of LBT success.
  • the disclosed SL-SSB related signaling may resolve ambiguity regarding the frequency location of SL-SSBs. Further, the signaling may be more efficient than conventional ARFCN based signaling. For example, the number of bits to indicate the frequency location may be based on a number of RB sets in a bandwidth part rather than a number of ARFCNs in a frequency range. The ability to attempt transmission on more than one SL-SSB occasion may improve likelihood of LBT success and successful transmission and reception of the SL-SSB.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • such computer-readable media can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) , which may be wired or wireless.
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184, which may be wired or wireless.
  • NG-RAN Next Generation RAN
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) .
  • the third backhaul links 134 may be wired or wireless.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by device 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by device 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be coupled with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the SL-SSB component 140 of FIG. 1.
  • at least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with the SL-SSB component 140 of FIG. 1.
  • FIG. 4 is a diagram 400 illustrating an example of RB sets for communications between wireless communication devices such as UEs.
  • UEs there may be five UEs 104 within a cell that are configured for sidelink communications within a bandwidth part (BWP) 402.
  • BWP bandwidth part
  • Each pair of UEs may be configured with different RB sets, for example, based on capabilities of each UE.
  • a base station may configure each UE with an inter-cell guard band for both transmitting on an uplink (UL) and receiving on a downlink (DL) .
  • an inter-cell guard band may apply when transmitting on a sidelink or receiving on a sidelink.
  • a first UE may be configured with a guardband (GB) 414 for communications 410 with a second UE (UE1) .
  • the GB 414 may separate each RB set 412 within the BWP 402.
  • the first UE may be configured with a GB 424 for communications 420 with a third UE (UE2) .
  • the GB 424 may be smaller than the GB 414, for example, due to greater receive capabilities of the third UE than the second UE.
  • the RB sets 422 may be larger (i.e., include more RBs) than the RB sets 412.
  • the fourth UE (UE3) may be configured with a GB 434 for communications 430 with the fifth UE (UE4) .
  • the GB 434 may be greater than the GB 414 and the GB 424. Accordingly, the RB set 432 may be smaller than the RB set 412 or RB set 422. In some implementations, the smallest RB set among the configured UEs may be referred to as a common minimum RB set or a minimum overlapping RB set. In some implementations, the common minimum RB set may be the intersection of all the supported RB set configuration. For example, the supported RB set configurations may be defined in a standards document or regulation.
  • a SL-SSB 440 may be transmitted over a number of RBs. For example, as illustrated in FIG. 2B, an SSB on a Uu link is conventionally transmitted over 20 RBs. With a 15 kHz sub-carrier spacing (SCS) , 20 RBs may be equal to 3.6 MHz. In some 3GPP release 16 and 17 systems, a SL-SSB may span 11 common RBs within a SL bandwidth part. Larger SCS may result in a larger portion of bandwidth for transmission of the SSB. For communications in unlicensed spectrum, where the 20 MHz basic channel unit and the GB limit the size of the RB set, the selection of a frequency location for the SL-SSB 440 may be limited.
  • SCS sub-carrier spacing
  • OCB occupied channel bandwidth
  • the SL-SSB may be enhanced to meet the OCB requirement, for example via repetition over more RBs.
  • a UE 104 may transmit a SL-SSB on the minimum RB set 432 such that the SL-SSB transmission satisfies the OCB requirement and the other UEs can receive the SL-SSB.
  • the SL-SSB 440 may use a large portion of an RB set 432 (e.g., at least 80%) . Because the SL-SSB 440 should not overlap a GB, only some locations within the RB set 432 may be appropriate for the SL-SSB 440.
  • an absolute radio frequency channel number (ARFCN) 450 is used to indicate a center frequency of an SSB.
  • the number of ARFCNs 450 may be much greater than the number of RBs in a RB set. For example, there may be 1333 ARFCNs within a 20 MHz basic channel unit over 3000 MHz.
  • signaling an ARFCN may be inefficient for indicating a location of a SL-SSB, for example, because a large number of ARFCNs may correspond to inappropriate locations for the SL-SSB and, in some cases, multiple ARFCNs may indicate the same RBs.
  • FIG. 5 is a diagram 500 illustrating an example of SL-SSB occasions within RB sets for communications between wireless communication devices such as UEs.
  • a bandwidth part 504 may be configured on a shared frequency band 502.
  • the bandwidth part 504 may include multiple channels 506 (e.g., channels 506a, 506b, and 506c) .
  • Each UE may be configured with an RB set in each channel 506.
  • RB sets for three UEs UE0 510, UE1 520, and UE2 530
  • Each UE may be configured with a corresponding GB 514, 524, 534, (e. g., based on a receive capability of the UE) .
  • a minimum RB set may be a size of the smallest RB set configured for a UE.
  • the RB set 522 for the UE 520 may be the smallest because the GB 534 is the largest.
  • a minimum RB set 540 may be the same size as the RB set 522.
  • the minimum RB set 540 may be a smallest configurable size for a UE (e.g., based on a maximum GB size) even if no UE is actually configured with the minimum RB set 540.
  • the minimum RB set 540 within each channel may be common to each of the UEs 510, 520, 530. Accordingly, if an SL-SSB is transmitted in the minimum RB set 540, each UE configured with an RB set on that channel 506 may receive the SL-SSB.
  • an indication may identify a location of a reference SL-SSB occasion 550.
  • An SL-SSB occasion may refer to a frequency location on which an SL-SSB may be transmitted.
  • the indication may efficiently indicate the location of the SL-SSB occasion.
  • the SL-SSB occasion may be a reference SL-SSB occasion or the RB set may be a reference RB set in one channel that corresponds to SL-SSB occasions in other channels.
  • the SL-SSB occasion in each channel may have a same relative position such that a UE may determine the SL-SSB occasion in each channel based on a reference SL-SSB occasion or reference RB set.
  • the indication may be a value similar to an ARFCN, but with a different formula to indicate the center frequency of the SL-SSB.
  • a defined RRC parameter such as sl-AbsoluteFrequencySSB may be used to signal an index indicating the location of the SL-SSB.
  • F BWP is the starting frequency of the bandwidth part 504
  • ⁇ F is a pre-configured or configured step size
  • the index is the signaled value.
  • ⁇ F may be, for example, pre-configured in a standards document or regulation or configured via broadcast or RRC signaling.
  • ⁇ F may be 15 kHz, 20 MHz, or another configured size.
  • the ⁇ F 550 may be configured as 10 MHz.
  • the index (e.g., 3) may be selected to confine the SL-SSB within one RB set (e.g., a minimum RB set) .
  • the formula may further include an offset (e.g., to adjust the position of the SL-SSB occasion within the RB set.
  • the frequency location of the SL-SSB occasion 550 may be indicated as an RB offset 580 of a first resource block of the SL-SSB occasion 550 from a first RB of the bandwidth part 504.
  • the offset 580 may be selected such that the SL-SSB occasion 550 is within an RB set (e.g., a minimum RB set) .
  • the RB offset 580 may be signaled as an RRC parameter.
  • the candidate SL-SSB occasions may be in every RB set. That is, the number of SL-SSB occasions may depend on the number of RB sets within the bandwidth part 504.
  • the RRC signaling may include an absolute bitmap that indicates whether each of the resource block sets within the bandwidth part includes a SL-SSB occasion. That is, each bit of the bitmap may indicate whether a corresponding RB set includes an SL-SSB occasion.
  • the RRC signaling may indicate a resource indication value indicating a number of consecutive resource block sets within the bandwidth part 504, starting from the reference resource block set, that include SL-SSB occasions.
  • the UE may determine one or more SL-SSB occasions on which to transmit the SL-SSB.
  • the UE may transmit the SL-SSB on all of the channels or RB sets that pass the LBT procedure. Transmission on multiple sets may increase frequency diversity and/or allow soft combining of the SL-SSB from different RB sets.
  • the UE may transmit the SL-SSB on consecutive resource block sets that pass the LBT procedure.
  • the UE may select one of the SL-SSB occasions that satisfies the condition for transmitting the SL-SSB. Transmission on a single RB set may avoid splitting transmit power among multiple channels, which may increase the range of the transmission compared to transmitting the SL-SSB on multiple channels.
  • FIG. 6 is a message diagram 600 illustrating example messages between a base station 602 and one or more UEs 510, 520.
  • the base station 602 may configure UEs within its coverage area with parameters.
  • the UEs 510, 520 may be connected to the base station 602, for example, via a Uu link with an RRC connection.
  • the base station 602 may transmit RRC configuration messages to the UEs 510, 520.
  • a UE 520 may not be connected to the base station 602 or may not receive an RRC configuration message.
  • Another UE 510 may forward the content of an RRC message to the UE 520.
  • the base station 602 may transmit an indication 610 of a frequency location of a SL-SSB within a bandwidth part of a shared frequency band.
  • the indication 610 may indicate a frequency location of a SL-SSB occasion 550 within the bandwidth part 504 of the shared frequency band 502.
  • the indication 610 is an RRC configuration message.
  • the indication 610 may also configure the bandwidth part 504 and/or the RB sets 512, 522, 532.
  • the indication 610 may have a format that is specific to shared spectrum that may be more efficient than signaling an ARFCN of the center frequency of the SL-SSB.
  • a first UE 510 that receives the indication 610 may forward the content of the indication to one or more other UEs 520.
  • the first UE 510 may transmit an indication 612, which may be, for example, a sidelink RRC message.
  • the first UE 510 may determine one or more SL-SSB occasions 550, 552 based on the indication 610.
  • the UE 510 may transmit a SL-SSB 620 on the one or more SL-SSB occasions 550, 552.
  • the SL-SSB may include a sidelink primary synchronization signal (S-PSS) , a sidelink secondary synchronization signal (S-SSS) and a physical sidelink broadcast channel (PSBCH) .
  • transmitting the SL-SSB 620 may include an interlaced RB transmission for all of S-PSS/S-SSS/PSBCH.
  • transmitting the SL-SSB 620 may use interlaced RB transmission for PSBCH only, and apply an occupied channel bandwidth (OCB) exemption to S-PSS and S-SSS.
  • transmitting the SL-SSB 620 may include repeating the S-PSS/S-SSS/PSBCH N times in frequency domain, and there may be a gap between the repetitions to meet an OCB requirement.
  • transmitting the SL-SSB 620 may repeat only S-PSS/S-SSS K times in frequency domain, and the PSBCH may be rate matched. There may be a gap between the repetitions to meet OCB requirement.
  • transmitting the SL-SSB 620 may keep the legacy S-PSS/S-SSS/PSBCH (e.g., in licensed spectrum) while repeating PSBCH N times in frequency domain and rate-matching PSBCH to S-PSS/S-SSS symbols, and there may be a gap between the PSBCH repetition (s) to meet OCB requirements.
  • Transmitting the SL-SSB 620 may optionally apply an OCB exemption to all of S-PSS/S-SSS/PSBCH.
  • the second UE 520 may also determine the one or more SL-SSB occasions 550, 552 based on the indication 610 or the indication 612.
  • the second UE 520 may receive the SL-SSB 620 on the one or more SL-SSB occasions 550, 552.
  • the UE 520 may be configured to receive the SL-SSB 620 using any of the transmission formats discussed above.
  • the second UE 520 may also transmit an SL-SSB 630 on the one or more SL-SSB occasions 550, 552.
  • the first UE 510 and the second UE 520 may select different time-domain resources for transmitting the SL-SSB 620 and the SL-SSB 630.
  • the LBT procedure may ensure that only one of the first UE 510 or the second UE 520 transmits on the channel.
  • the second UE 520 may transmit the SL-SSB in the same manner that the first UE 510 transmits the SL-SSB, except the S-PSS, S-SSS, and PBSCH may be different.
  • the SL-SSB 620 may allow the receiving second UE 520 to receive other sidelink channels such as a physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) from the UE 510.
  • the SL-SSB 630 may allow the receiving first UE 510 to receive PSCCH and/or PSSCH from the UE 520. Accordingly, after exchange of at least one of the SL-SSB 620 or SL-SSB 630, the first UE 510 and the second UE 520 may engage in sidelink communication 640.
  • FIG. 7 is a resource diagram 700 illustrating a bitmap 710 for indicating whether each of the resource block sets 512 within the bandwidth part 504 includes a SL-SSB occasion 550, 552.
  • the bitmap 710 may be a field in the indicator 610.
  • the bitmap 710 may have a length equal to a number of RB sets configured in the bandwidth part 504.
  • the bandwidth part 504 may include four RB sets 512 (e.g., 512a, 512b, 512c, and 512d) .
  • the bitmap 710 may have a value of 0101, which indicates that RB sets 512b and 512d include a SL-SSB occasion 550 or 552.
  • FIG. 8 is a resource diagram 800 illustrating a bitmap 810 for indicating whether the non-reference RB sets 512 within the bandwidth part 504 include a SL-SSB occasion 552.
  • the bitmap 810 may be a field in the indicator 610.
  • the indicator 610 may indicate the reference RB set (e.g., RB set 512b) .
  • the bitmap 810 may have a length equal to one less than the number of RB sets configured in the bandwidth part 504.
  • the bandwidth part 504 may include four RB sets 512 (e.g., 512a, 512b, 512c, and 512d) and the bitmap 810 may have a length of three.
  • the bitmap 810 may have a value of 010.
  • the bitmap 810 indicates whether each of the other resource block sets 512 within the bandwidth part 504, starting from a RB set 512c in a frequency channel 506c above the reference RB set 512b and wrapping around a highest frequency channel in the bandwidth part 504 (e.g., channel 506d) to lower frequency channels (e.g., channel 506a) , includes a SL-SSB occasion. Accordingly, as illustrated, the bitmap 810 indicates that RB sets 512b and 512d include a SL-SSB occasion 550 or 552.
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different means/components in an example UE 904, which may be an example of the UE 104 including SL-SSB component 140.
  • the UE 904 also may include a receiver component 910 and a transmitter component 912.
  • the receiver component 910 may include, for example, a RF receiver for receiving the signals described herein.
  • the transmitter component 912 may include for example, an RF transmitter for transmitting the signals described herein.
  • the receiver component 910 and the transmitter component 912 may be co-located in a transceiver such as the Tx/Rx 354 in FIG. 3.
  • the indication receiving component 142 may receive the indication 610 or 612. The indication receiving component 142 may decode a received indication to determine the SL-SSB occasions. The indication receiving component 142 may determine one or more values signaled in the indication 610 such as the ⁇ F 560, the offset 572, the RB offset 580, an index 920, an RB index 930, the bitmap 710, the bitmap 810, or a resource indication value (RIV) 940. The indication receiving component 142 may then determine a reference RB set and/or reference SL-SSB occasion 550 based on the signaled values.
  • the indication receiving component 142 may determine whether one or more of the other RB sets configured for the UE 904 includes a corresponding SL-SSB occasion 552.
  • the indication receiving component 142 may output the reference SL-SSB occasion 550 and any corresponding SL-SSB occasions 552 to both the SL-SSB receiving component 144 and the SL-SSB transmitting component 146.
  • the SL-SSB receiving component 144 may be configured to receive the SL-SSB 620, 630 on an SL-SSB occasion 550, 552 based on a reference resource block set at the frequency location. For example, the SL-SSB receiving component 144 may monitor signals received on the indicated SL-SSB occasions 550, 552 via the receiver component 910 for the SL-SSB 620, 630.
  • the SL-SSB transmitting component 146 may be configured to transmit the SL-SSB 620, 630 on an SL-SSB occasion 550, 552 based on a reference resource block set at the frequency location.
  • the SL-SSB receiving component 144 may generate an SL-SSB signal for transmission on the indicated SL-SSB occasions 550, 552 via the transmitter component 912.
  • FIG. 10 is a flowchart of an example method 1000 for operating a UE 104 (e.g., the first UE 104) for transmitting or receiving a SL-SSB in shared spectrum.
  • the method 1000 may be performed by a UE (such as the UE 104, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104 such as the SL-SSB component 140, the TX processor 368, the RX processor 356, or the controller/processor 359) .
  • the method 1000 may be performed by the SL-SSB component 140 in communication with a sidelink configuration component 120 of a base station 102 and/or a SL-SSB component 140 of a second UE 104.
  • the method 1000 includes receiving, at a wireless device, an indication of a frequency location of a SL-SSB within a bandwidth part of a shared frequency band.
  • the UE 104, the RX processor 356 and/or the controller/processor 359 may execute the SL-SSB component 140, the transmitter component 912, and/or the indication receiving component 142 to receive, at the wireless device (e.g., UE 104, 510, 520, or 904) an indication 610 of a frequency location of a SL-SSB 620, 630 within a bandwidth part 504 of a shared frequency band 502.
  • the indication 610 includes an index 920 of a sidelink absolute frequency indicating a center frequency of the SL-SSB occasion 550 based on a starting frequency of the bandwidth part 504, a step size (e.g., ⁇ F 560) , and the index 920.
  • the center frequency of the SL-SSB occasion 550 is further based on an offset 572 from a start of a step.
  • the indication 610 identifies a center frequency of the reference resource block set (e.g., RB set 512b) as an index of resource block sets (e.g., RB index 930) within the bandwidth part 504.
  • the indication 610 includes an offset (e.g., RB offset 580) of a first resource block of the SL-SSB occasion 550 from a first resource block of the bandwidth part 504.
  • the reference resource block set e.g., RB set 512b
  • the reference resource block set is within a minimum resource block set 540 that is an intersection of a set of supported resource block set configurations.
  • the minimum resource block set 540 excludes resource blocks in the guard band (e.g., GB 514) between the first 20-MHz channel (e.g., channel 506a) and the other channel (e.g., 506b) in the bandwidth part 504 and excludes resource blocks in one or more other guard bands (e.g., GB 524 or 534) for at least one other wireless device.
  • the UE 104, the RX processor 356 and/or the controller/processor 359 executing the SL-SSB component 140, the receiver component 910, and/or the indication receiving component 142 may provide means for receiving, at a wireless device, an indication of a frequency location of a SL-SSB within a bandwidth part of a shared frequency band.
  • the method 1000 includes transmitting or receiving the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location.
  • the UE 104, the TX processor 368, the RX processor 356 and/or the controller/processor 359 may execute the SL-SSB component 140, the SL-SSB transmitting component 146 and/or the SL-SSB receiving component 144 to transmit or receive the SL-SSB 620, 630 on an SL-SSB occasion 550, 552 based on a reference resource block set (e.g., . RB set 512b) at the frequency location.
  • the reference resource block set of the SL-SSB is within a first 20-MHz channel 506a separated from another channel 506b in the bandwidth part 504 by a GB 514.
  • a plurality of SL-SSB occasions 552 are supported in other resource block sets 512 within the bandwidth part 504 corresponding to the frequency location of the SL-SSB within the reference resource block set (e.g., RB set 512b) .
  • the block 1020 may optionally include transmitting or receiving the SL-SSB on one or more of the plurality of SL-SSB occasions that satisfy a LBT condition.
  • the block 1020 may optionally include transmitting the SL-SSB on each SL-SSB occasion that satisfies the LBT condition.
  • the block 1020 may optionally include transmitting the SL-SSB on consecutive resource block sets. In some implementations, at sub-block 1028, the block 1020 may optionally include selecting one of the SL-SSB occasions that satisfies the LBT condition for transmitting the SL-SSB. For example, the SL-SSB transmitting component 146 may randomly or pseudo-randomly select the one SL-SSB occasion.
  • the UE 104, the RX processor 356, and/or the controller/processor 359 executing the SL-SSB component 140, the SL-SSB transmitting component 146 and/or the SL-SSB receiving component 144 may provide means for transmitting or receiving the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location.
  • An apparatus for wireless communication at a user equipment comprising: a transceiver; a memory storing computer-executable instructions; and a processor coupled with the transceiver and the memory and configured to execute the computer-executable instructions to: receive, via the transceiver, an indication of a frequency location of a sidelink synchronization signal block (SL-SSB) within a bandwidth part of a shared frequency band; and transmit or receive, via the transceiver, the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location, wherein the reference resource block set of the SL-SSB is within a first 20-MHz channel separated from another channel in the bandwidth part by a guard band.
  • SL-SSB sidelink synchronization signal block
  • the indication includes an index of a sidelink absolute frequency indicating a center frequency of the SL-SSB occasion based on a starting frequency of the bandwidth part, a step size, and the index.
  • Clause 4 The apparatus of clause 1, wherein the indication identifies a center frequency of the reference resource block set as an index of resource block sets within the bandwidth part.
  • Clause 5 The apparatus of clause 1, wherein the indication includes an offset of a first resource block of the SL-SSB occasion from a first resource block of the bandwidth part.
  • Clause 8 The apparatus of clause 7, wherein the plurality of SL-SSB occasions includes one SL-SSB occasion in each of the other resource block sets within the bandwidth part.
  • Clause 13 The apparatus of any of clauses 7-11, wherein to transmit the SL-SSB on one or more of the plurality of SL-SSB occasions, the processor is configured to execute the instructions to transmit the SL-SSB on consecutive resource block sets.
  • Clause 14 The apparatus of any of clauses 7-11, wherein to transmit the SL-SSB on one or more of the plurality of SL-SSB occasions, the processor is configured to execute the instructions to select one of the SL-SSB occasions that satisfies the LBT condition for transmitting the SL-SSB.
  • a method of wireless communication comprising: receiving, at a wireless device, an indication of a frequency location of a sidelink synchronization signal block (SL-SSB) within a bandwidth part of a shared frequency band; and transmitting or receiving, at the wireless device, the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location, wherein the reference resource block set of the SL-SSB is within a first 20-MHz channel separated from another channel in the bandwidth part by a guard band.
  • SL-SSB sidelink synchronization signal block
  • Clause 16 The method of clause 15, wherein the indication includes an index of a sidelink absolute frequency indicating a center frequency of the SL-SSB occasion based on a starting frequency of the bandwidth part, a step size, and the index.
  • Clause 18 The method of clause 15, wherein the indication identifies a center frequency of the reference resource block set as an index of resource block sets within the bandwidth part.
  • Clause 19 The method of clause 15, wherein the indication includes an offset of a first resource block of the SL-SSB occasion from a first resource block of the bandwidth part.
  • Clause 20 The method of any of clauses 15-20, wherein the reference resource block set is within a minimum resource block set that is an intersection of a set of supported resource block set configurations.
  • Clause 21 The method of any of clauses 15-20, wherein a plurality of SL-SSB occasions are supported in other resource block sets within the bandwidth part corresponding to the frequency location of the SL-SSB within the reference resource block set, wherein transmitting or receiving the SL-SSB on the SL-SSB occasion based on the reference resource block set comprises transmitting or receiving the SL-SSB on one or more of the plurality of SL-SSB occasions that satisfy a listen before talk (LBT) condition.
  • LBT listen before talk
  • Clause 22 The method of clause 21, wherein the plurality of SL-SSB occasions includes one SL-SSB occasion in each of the other resource block sets within the bandwidth part.
  • Clause 23 The method of clause 21, wherein the indication includes a bitmap indicating whether each of the resource block sets within the bandwidth part includes a SL-SSB occasion.
  • Clause 25 The method of clause 21, wherein the indication includes a bitmap indicating whether each of the other resource block sets within the bandwidth part, starting from a resource block set in a frequency channel above the reference resource block set and wrapping around to lower frequency channels, includes a SL-SSB occasion.
  • Clause 26 The method of any of clauses 21-24, wherein transmitting or receiving the SL-SSB on one or more of the plurality of SL-SSB occasions comprises transmitting the SL-SSB on each SL-SSB occasion that satisfies the LBT condition.
  • Clause 27 The method of any of clauses 21-24, wherein transmitting or receiving the SL-SSB on one or more of the plurality of SL-SSB occasions comprises transmitting the SL-SSB on consecutive resource block sets.
  • Clause 28 The method of any of clauses 21-24, wherein transmitting or receiving the SL-SSB on one or more of the plurality of SL-SSB occasions comprises selecting one of the SL-SSB occasions that satisfies the LBT condition for transmitting the SL-SSB.
  • An apparatus for wireless communication at a user equipment comprising: means for receiving an indication of a frequency location of a first sidelink synchronization signal block (SL-SSB) within a bandwidth part of a shared frequency band; and means for transmitting the first SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location, wherein the reference resource block set of the SL-SSB is within a first 20-MHz channel separated from another channel in the bandwidth part by a guard band; and means for receiving a second SL-SSB on the SL-SSB occasion.
  • SL-SSB sidelink synchronization signal block
  • Clause 30 The apparatus of clause 29, wherein the means for transmitting the first SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location is configured to transmit the SL-SSB according to the method of any of clauses 15-28.
  • a non-transitory computer-readable medium storing computer-executable instructions that when executed by a processor of a wireless device, cause the wireless device to: receive an indication of a frequency location of a sidelink synchronization signal block (SL-SSB) within a bandwidth part of a shared frequency band; and transmit or receive the SL-SSB on an SL-SSB occasion based on a reference resource block set at the frequency location, wherein the reference resource block set of the SL-SSB is within a first 20-MHz channel separated from another channel in the bandwidth part by a guard band.
  • SL-SSB sidelink synchronization signal block
  • Clause 32 The non-transitory computer-readable medium of clause 31, wherein the computer-executable instructions comprise instructions to perform the method of any of clauses 15-28.
  • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un appareil de communication sans fil au niveau d'un équipement utilisateur (UE) comprend un émetteur-récepteur ; une mémoire stockant des instructions exécutables par ordinateur ; et un processeur couplé à l'émetteur-récepteur et à la mémoire et configuré pour gérer l'émission et la réception d'un bloc de signal de synchronisation de liaison latérale (SL-SSB). L'appareil reçoit, par le biais de l'émetteur-récepteur, une indication d'un emplacement de fréquence d'un bloc de signal de synchronisation de liaison latérale (SL-SSB) dans une partie de largeur de bande d'une bande de fréquence partagée. L'appareil émet ou reçoit, par le biais de l'émetteur-récepteur, le SL-SSB sur une occasion SL-SSB sur la base d'un ensemble de blocs de ressources de référence à l'emplacement de fréquence, l'ensemble de blocs de ressources de référence du SL-SSB se trouvant dans un premier canal de 20 MHz séparé d'un autre canal dans la partie de largeur de bande par une bande de garde.
EP23920513.1A 2023-02-10 2023-02-10 Amélioration de ssb sl-u dans une opération à large bande Pending EP4662940A1 (fr)

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3691374B1 (fr) * 2017-09-30 2022-02-16 Huawei Technologies Co., Ltd. Procédé et dispositif de communication
US11778572B2 (en) * 2020-05-22 2023-10-03 Qualcomm Incorporated Lite SL-SS (sidelink synchronization signal) transmission for on demand S-SSB (sidelink synchronization signal block)
US20230007462A1 (en) * 2021-07-02 2023-01-05 Qualcomm Incorporated Discovery signal transmission for sidelink communication over unlicensed band
WO2023216203A1 (fr) * 2022-05-12 2023-11-16 北京小米移动软件有限公司 Procédé et appareil de configuration de ressources

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