EP4008075A1 - Techniques de mise à jour de taille de fenêtre de contention - Google Patents

Techniques de mise à jour de taille de fenêtre de contention

Info

Publication number
EP4008075A1
EP4008075A1 EP20737665.8A EP20737665A EP4008075A1 EP 4008075 A1 EP4008075 A1 EP 4008075A1 EP 20737665 A EP20737665 A EP 20737665A EP 4008075 A1 EP4008075 A1 EP 4008075A1
Authority
EP
European Patent Office
Prior art keywords
transmission
reference duration
pdsch
duration
cot
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
EP20737665.8A
Other languages
German (de)
English (en)
Inventor
Kapil Bhattad
Xiaoxia Zhang
Jing Sun
Pravjyot Singh DEOGUN
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
Priority claimed from US16/903,226 external-priority patent/US11778661B2/en
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of EP4008075A1 publication Critical patent/EP4008075A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • 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 signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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), DMT
    • 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—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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]

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to techniques for determining wireless communication including a contention window.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low-latency communications (URLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable low-latency communications
  • LAA Licensed Assisted Access
  • NR-U new radio, unlicensed
  • a base station may be configured to implement one or more techniques for determining reference transmissions for CW update or adjustment. Specifically, the base station may employ reference transmission determination techniques to determine one or more downlink reference transmissions for use in adjusting or updating the base station’s CW.
  • the techniques for determining the reference transmission may directly determine the reference transmission or may determine the reference transmission by first determining a reference duration and then determining the reference transmission based at least in part on the determined reference duration.
  • the transmitting node may monitor the success or failure of the transmitted reference signal (e.g., ACKs or NACKs sent by the receiving node). The transmitting node may then use the success or failure of a receiving node to receive the transmitted reference signal to selectively adjust the transmitting node’s CW.
  • the transmitted reference signal e.g., ACKs or NACKs sent by the receiving node.
  • the transmitting node may then use the success or failure of a receiving node to receive the transmitted reference signal to selectively adjust the transmitting node’s CW.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication.
  • the apparatus may determine a reference duration of a channel occupancy time (COT), the reference duration based at least in part on a subcarrier spacing (SCS) and based on reception of a physical downlink shared channel (PDSCH) transmission.
  • COT channel occupancy time
  • SCS subcarrier spacing
  • PDSCH physical downlink shared channel
  • the apparatus may updates a CW based at least in part on reception of the PDSCH transmission during the reference duration.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a base station.
  • the base station may determine a reference duration of a COT, the reference duration being based at least in part on a SCS.
  • the base station may further determine at least one reference physical downlink control channel (PDCCH) transmission transmitted during the reference duration.
  • the base station may further update a CW based at least in part on an uplink transmission having the at least one reference PDCCH transmission transmitted during the reference duration.
  • PDCCH physical downlink control channel
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a base station.
  • the base station may determine a reference duration of a COT.
  • the base station may further determine whether to use a reference PDSCH transmission or a reference physical uplink shared channel (PUSCH) transmission for updating a CW.
  • the base station may further update the CW based on the PDSCH or the reference PUSCH transmission and the reference duration.
  • PUSCH physical uplink shared channel
  • Figure 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • Figures 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first 5G/NR frame
  • Figure 3 is a diagram illustrating an example of a base station and user equipment
  • Figure 5 illustrates various techniques for determining reference duration (RD), reference signals, and CW size according to some implementations.
  • Figure 6A illustrates a technique for determining a reference duration in slot units according to one example.
  • Figure 6B illustrates a technique for determining a reference duration in symbol units scheduling according to another example.
  • Figure 7C illustrates a technique for determining a reference signal based at least in part on a reference duration, a starting point of the reference signal, and an ending point of the reference signal according to another example.
  • Figure 8A illustrates a technique for determining reference duration when PDSCH is punctured according to one example.
  • Figure 8B illustrates a technique for determining reference duration when PDSCH is punctured according to another example.
  • Figure 9A illustrates a technique for determining reference duration when PDSCH is sub-band punctured according to one example.
  • Figure 9B illustrates a technique for determining reference duration when PDSCH is sub-band punctured according to another example.
  • Figure 10 illustrates one or more reference signals determined directly from a predetermined time or predetermined number of symbols in a first slot according to one example.
  • Figure 13 is a flowchart of a method of wireless communication according to a second example.
  • Figure 14 is a flowchart of a method of wireless communication according to a third example.
  • Figure 16 is a data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • Figure 17 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • Figure 18 is a data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • Figure 19 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • 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.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise 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.
  • the base stations 102 configured for 4G LTE (collectively referred to as Evolved
  • UMTS Universal Mobile Telecommunications System
  • E-UTRAN Universal Mobile Telecommunications System
  • 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.
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over backhaul links 134 (e.g., X2 interface).
  • the backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG).
  • eNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 / UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions.
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include a Access and Mobility Management Function
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • the UE 104 may comprise a contention window component 199 configured to implement one or more techniques for determining a CW update/adjustment, which may include determining a reference transmission for determining the CW update.
  • a base station 102/180 may comprise a contention window component 198 configured to determine a CW update or adjustment, e.g., which may include determination of a reference transmission for determining the CW update.
  • subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61.
  • Slot formats 0, 1 are all DL, UL, respectively.
  • Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • 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). Note that the description below applies also to a 5G/NR frame structure that is TDD.
  • DCI DL control information
  • RRC radio resource control
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer
  • a base station or UE may perform a listen before talk (LBT) procedure to contend for access to the shared radio frequency spectrum band.
  • LBT procedure may include performing a CCA procedure to determine whether a channel of the contention-based shared radio frequency spectrum band is available.
  • a wireless device may transmit a channel reserving signal, such as a channel usage beacon signal (CUBS) to reserve the channel.
  • CUBS channel usage beacon signal
  • a slot size may be different based on a different Subcarrier Spacing (SCS).
  • SCS Subcarrier Spacing
  • a UE 402 may employ CW size adjustment techniques (e.g., 412 and 418) to adjust or update its CW size or value.
  • the UE 402 sends one or more uplink transmissions in a transmit opportunity (TxOp) to the base station 404.
  • the uplink transmissions may be, for example, PUCCH or PUSCH transmissions.
  • the UE 402 determines at least one uplink reference transmission directly or based on a determined RD.
  • the UE 402 updates or adjusts its CW size based on one or more ACK/NACK feedback of the reference transmission, which are sent by the base station 404 and received by the UE 402 in 414.
  • the base station 404 may employ CW size adjustment techniques (e.g., 422 and 428) to adjust or update its CW size or value.
  • the base station 404 may send one or more downlink transmissions in a TxOp to the UE 402.
  • the downlink transmissions may be, for example, PDCCH or PDSCH transmissions.
  • the base station 404 determines at least one downlink reference transmission directly or based on a determined RD.
  • the base station 404 updates or adjusts its CW size based on one or more ACK/NACK feedback of the reference transmission, which are sent by UE 402 and received by the base station 404 in 424.
  • FIG. 5 illustrates various techniques 500 for determining an RD, reference transmissions, and a CW size according to some implementations.
  • An RD determination component 504 may include an SCS dependent RD generator 508 that generates an RD 506 that is dependent on SCS.
  • the SCS dependent RD generator 508 may also include slot-based RD determination techniques 514 and symbol-based RD determination techniques 518. Slot-based RD determination techniques 514 are described in greater detail below with reference to Figure 6A, and symbol-based RD determination techniques 518 are described in greater detail below with reference to Figure 6B.
  • one or more slot-based RD techniques 514 may be utilized to generate an RD 506 that is based on a number of slots (e.g., an RD having a duration in units of slots).
  • the RD 506 may be based on a minimum supported SCS.
  • the RD may be predefined based on a minimum supported SCS (e.g., an RD of 1 ms may be used if a minimum supported SCS is 15 kHz).
  • An RD may be based on a minimum SCS supported by the transmitting device. For example, if a base station supports a minimum SCS of 15kHz, then the base station may use an RD of 1ms.
  • FIGs. 6A illustrates an example slot size 604 and two different RDs 610 and 614 based on different reference SCS sizes.
  • FIG. 6A illustrates an example slot size 604 and two different RDs 610 and 614 based on different reference SCS sizes.
  • FIG. 6B also illustrates an example symbol size 644 and a size of an RD 640 that has a duration that is based on a reference SCS.
  • the duration of the RD is based on a slot size, e.g., a number of slots.
  • the duration of the RB has a duration based symbol units, e.g., one or more symbols in length.
  • the RD may have a size of a particular number of slots
  • FIG. 6B the RD may have a size of a particular number of symbols.
  • the base station may determine an RD based on a partial slot, e.g., based on symbols.
  • Such scheduling may also be referred to herein as sub-slot scheduling.
  • the RD can extend from the beginning of the first slot to the symbol of the PDSCH that ends earliest.
  • the base station may determine the RD to be SI -S3 because the first PDSCH ends earliest in the first slot.
  • the base station may determine the RD based on the earliest ending PDSCH without considering where the PDSCH started in the COT. Thus, the base station may determine the RD to extend from SI to S8.
  • the base station may determine the RD based on an earliest ending PDSCH and also considering whether PDSCHs that start early in TxOP or have a PDCCH that starts early in TxOP.
  • the term,“early,” may be defined as starting within a first X symbols or X ms of the COT. X may correspond to an integer value so that X symbols corresponds to a number of symbols.
  • the base station may determine RD to be from SI to SI 3, because the PDSCH from SI to S13 starts early in the COT.
  • the RD determination techniques may be applied independently per SCS, so that there are some PDSCHs for each SCS.
  • An RD may be determined based on a maximum or a minimum of the RD determined across all SCSs.
  • the RD may be determined and applied per SCS.
  • the base station may determine and apply multiple RDs.
  • the RD determination techniques described previously may also be applied at a CBG level when CBG based feedback/transmission is used.
  • the RD may be based on an earliest ending first CBG of a PDSCH or based on first CBG of a PDSCH that starts early in the TxOP.
  • duration may be determined as slots S1-S2 because the first PDSCHs first CBG ends earliest.
  • the RD may be based on a first CBG of a PDSCH that starts within a certain time period with reference to the beginning of the COT.
  • a base station may determine an RD based on a maximum value of the RDs determined with any of the techniques described herein.
  • the determined value may have a lower bound so that RD may not be less than a predetermined minimum value, such as 0.25 ms.
  • the base station may identify the reference PDSCH(s) as all of the PDSCH transmissions whose PDCCH was sent within the RD.
  • Figure 7 A illustrates an example in which any PDSCH transmissions that starts within an identified RD at the start of the COT may be considered for a CW update, e.g., may be used as a reference PDSCH transmission.
  • PDSCH- 1 and PDSCH-2 are both used as reference PDSCH transmissions because both transmissions start within the RD.
  • Figure 7B illustrates an example in which the PDSCH transmissions that end within an identified RD at the start of the COT may be used as the reference PDSCH transmissions.
  • PDSCH-1 is used as a reference PDSCH, but PDSCH-2 is not considered a reference PDSCH because PDSCH-2 does not end in the RD.
  • Figure 7C illustrates an example in which the PDSCH CBGs that are within/overlap the RD may be used as reference transmissions.
  • PDSCH-1 may be used as a reference PDSCH in entirety, whereas the CBGs of PDSCH-2 that are within the RD may be used as reference CBGs to determine the CW update.
  • a CW Adjustment Component 534 receives a reference transmission 524, explicit feedback 536 and/or implicit feedback 538 and based thereon determines whether to adjust a CW size 542 for future LBT processes.
  • the LBT process may comprise a Cat-4 LBT process, for example.
  • Explicit feedback 536 and/or implicit feedback 538 may relate to whether a determined reference transmission was successfully received by a receiving node.
  • PDSCH- 1 does not have any non-punctured CBGs
  • PDSCH-2 has at least one CBG that is not punctured.
  • the CW update may be determined using an RD that does not consider any other PDSCHs and/or additional slots.
  • the base station may consider the unicast PDSCH for the RD determination, e.g., and may disregard the broadcast PDSCH when determining the RD.
  • the base station may use a message two (MSG2) or a random access procedure as a reference transmission.
  • the base station may consider whether a message 3 (MSG3) is received from the UE in response to the MSG2 transmission from the base station.
  • a MSG2 may comprise, e.g., a random access response (RAR) that is transmitted from the base station to the UE in response to a first random access message from the UE.
  • RAR random access response
  • the first random access message from the UE may comprise, e.g., a random access preamble to initiate a random access procedure.
  • the MSG3 from the UE may be considered to correspond to positive feedback (e.g., similar to an ACK) from the UE in response to the MSG2 random access message.
  • a MSG2 PDSCH/PDCCH may be used to determine an RD or a reference PDSCH when the MSG3 is considered for the CW update.
  • the MSG3 may be considered for the CW update when the communication between the base station and UE includes contention free random access.
  • the reference slot can be determined based on the partial slot and a next full slot when the next full slot is sent in a same TxOP.
  • puncturing may occur in both a time domain and a frequency domain.
  • NR-U can have carriers with multiple LBT subbands, e.g., in contrast to LTE. Thus, in NR-U, the puncturing might occur on some subbands and might not occur on other subbands.
  • the base station may determine an RD 506 based at least in part on the partial slot without additional slots.
  • Figure 9A illustrates an example in which the partial slot may be used as the RD 506.
  • PDSCH- 1 is punctured
  • PDSCH-6 is not punctured
  • the RD may be based on a first slot, as shown.
  • the base station may not consider the punctured PDSCH or the punctured CBGs in determining the CW adjustment.
  • the base station may determine the RD 506 based at least in part on the partial slot and the next N slots until the end of a transmission opportunity (TxOP) is reached, where N being an integer number.
  • N slots may indicate a number, N, of slots following the partial slot.
  • Figure 9B illustrate this case, where the RD includes additional slots beyond the slots comprising PDSCH-1, PDSCH-2, and PDSCH-3, because each of those PDSCH are punctured in subband 2.
  • the base station may extend the RD to include the additional slots until the RD includes a slot in which no PDSCHs are punctured.
  • a non-punctured slot may be a slot where all of the PDSCHs are not punctured, e.g., a slot without a punctured PDSCH.
  • a non-punctured slot may be a slot where at least one PDSCH is not punctured.
  • a non-punctured slot may be a slot where at least one PDSCH CBG is not punctured.
  • the base station may determine the RD 506 based on a full non-punctured slot and all the partial slots.
  • the base station may determine the RD 506 based on a full non-punctured slot and one partial slot.
  • the partial slot may be selected as a first partial slot of the COT or a partial slot preceding or immediately preceding the full non-punctured slot.
  • the base station may maintain a separate CW for each LBT subband.
  • the base station may determine an RD 506 or reference transmission (e.g., reference PDSCH) 524 independently for each subband.
  • the base station may determine the reference PDSCH as a full PDSCH (e.g., non-punctured PDSCH) or one or more CBGs of PDSCH(s) that are not punctured.
  • the base station may determine an RD 506 that is common across multiple subbands. For example, the base station may continue to increase the RD 506 until each subband has at least one PDSCH or CBG of PDSCH that is not punctured.
  • PDCCHs are transmitted within a reference slot of COT, to determine a CW update.
  • the base station may employ the techniques described previously with reference to Figures 5, 6A and 6B to determine the RD and also to determine which reference transmissions (e.g., which reference PUSCHs) to consider for the CW update.
  • the base station may determine the RD based on units of slots using the techniques described previously with reference to Figures 5 and 6A. Instead of considering the SCS of the PDSCH, the base station may consider the SCS of the PDCCHs that schedule the PUSCH transmissions. For techniques 509-511, the base station may determine the RD as a function of a minimum SCS, e.g., for the PDCCH, that is supported by the base station or a minimum SCS that is actually used by the base station to transmit the PDCCH at a beginning of a COT.
  • a minimum SCS e.g., for the PDCCH
  • the base station may determine the RD based on sub-slot scheduling techniques described previously. For example, the techniques 515 for determining the symbol based RD may be applied equally herein. Instead of determining which PDSCH ends earliest, the sub-slot scheduling technique may determine RD based on which PDCCH ends earliest.
  • the base station may determine a reference PUSCH by including each PUSCH transmission whose PDCCH was sent within an RD. Any of the previously described techniques to determine a reference transmission may also be applied in combination to directly determine a reference PUSCH or to determine a reference PUSCH based on a determined RD or other factor.
  • the base station updates a CW based at least in part on an uplink transmission having the PDCCH transmission transmitted during the RD.
  • the base station may schedule DL and UL transmissions in a TxOP, and the base station may perform a CW update based on ACK/NACK feedback for the DL transmissions while ignoring the success or failure of the UL transmissions.
  • Application of this technique may be based on the beginning of a COT including at least one DL transmission.
  • the UL transmissions and/or the DL transmissions may be used to update the CW size when a COT contains both UL and DL transmissions.
  • a base station may consider the ACK/NACK feedback for the DL transmissions when an early portion of a COT includes DL transmissions that can be used for the CW update. Otherwise, the base station may determine its CW update based on the UL transmissions while ignoring the DL transmissions.
  • the base station may consider both ACK/NACK feedback of the DL transmissions and the success/failure of the UL transmissions to update or adjust the CW size.
  • Figure 14 illustrates an example method of CW adjustment or update in which the base station determines whether to use a reference PDSCH transmission or a reference PUSCH transmission for updating the CW size.
  • the base station may determine to use a PDSCH transmission without using a PUSCH transmission to update the CW when the PDSCH has associated feedback and is transmitted during a period of time from the beginning of the COT.
  • the base station may determine to use the PUSCH transmission without using the PDSCH transmission to update the CW when no PDSCH having associated feedback is transmitted during the period of time from the beginning of the COT.
  • the base station may use both a PDSCH transmission and a PUSCH transmission to update its CW.
  • Figure 12 is a flowchart 1200 of a method of wireless communication.
  • the method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, apparatus 1602, 1602’; the processing system 1714, which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375).
  • a base station or a component of a base station e.g., base station 102, 180, 310, apparatus 1602, 1602’
  • the processing system 1714 which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375.
  • the method may be performed by a UE or a component of a UE (e.g., UE 104, 350, apparatus 1602, 1602’; the processing system 1714, which may include the memory 360 and which may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359).
  • a UE or a component of a UE e.g., UE 104, 350, apparatus 1602, 1602’; the processing system 1714, which may include the memory 360 and which may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359.
  • the TX processor 368 the entire UE 350
  • the RX processor 356, and/or the controller/processor 359 the controller/processor 359
  • the device determines an RD of a COT, the RD being based at least in part on an SCS and based on reception of a physical downlink shared channel (PDSCH) transmission.
  • the determination may be performed, e.g., by the reference duration determination component 1612 of apparatus 1602. Examples of such an RD determination are described, e.g., in connection with FIGs. 6A and 6B.
  • the reference duration may be determined based on a minimum SCS supported by the base station.
  • the reference duration may be determined based on a minimum SCS used by the device at a beginning of the COT.
  • the device may determine a first reference duration for a first SCS and a second reference duration for a second SCS, and wherein the device updates the CW based on a first shared channel transmission based on the first SCS during the first duration and a second downlink transmission based on the second SCS during the second duration.
  • the shared channel transmission may comprise PDSCH.
  • the shared channel transmission may comprise PUSCH.
  • the reference duration may be determined based on a maximum of: a predefined minimum duration; a minimum SCS supported by the device, or the minimum SCS used by the device at a beginning of the COT.
  • the reference duration of the COT may be determined based on a number of slots, e.g., as described in connection with FIG. 6A.
  • the reference duration of the COT may be determined based on a number of symbols, e.g., as described in connection with FIG. 6B.
  • the COT may include a first slot having a plurality of symbols, and the reference duration of the COT may be determined based on the number of symbols of a PDSCH transmission transmitted during the first slot of the COT.
  • the reference duration may be determined based on the PDSCH transmission having an earliest end symbol in the first slot of the COT.
  • the reference duration may be determined based on the PDSCH transmission having an earliest starting symbol in the first slot of the COT or having a PDCCH transmitted in the earliest symbol in the first slot of the COT.
  • the reference duration may be determined based on the PDSCH transmission starting within a predetermined number of symbols or a predetermined time from a beginning of the first slot of the COT or based on the PDSCH having a PDCCH that starts within the predetermined number of symbols or the predetermined time from the beginning of the first slot of the COT.
  • the reference duration may be determined based on at least one of whether CBG based feedback is available for at least one non-punctured CBG of the shared channel transmission when puncturing is performed at a beginning of the COT, wherein the reference duration is extended when the CBG based feedback is not available for the at least one non-punctured CBG.
  • the determination of the reference duration, at 1202 may include extending the reference duration when the shared channel transmission is punctured during the reference duration.
  • the reference duration or the reference PDSCH may be determined based on whether the shared channel transmission comprises a broadcast without feedback.
  • the CW may be updated based on the determined reference PDSCH transmission.
  • the reference duration may be extended to include the shared channel transmission having feedback.
  • the reference PDSCH may be defined based on the PDSCH occurring during the reference duration and having feedback.
  • the reference duration may be determined further based on whether at least one non- punctured PDSCH transmission or at least one non-punctured CBG is transmitted during the reference duration. For example, the reference duration may be extended when no non-punctured PDSCH or non-punctured CBG is transmitted during the reference duration.
  • the non-punctured slot may comprise at least one of: a first slot where all PDSCH transmissions are not punctured, a second slot where at least one PDSCH transmission is not punctured, and/or a third slot where at least one PDSCH CBG is not punctured.
  • the reference duration may be extended to include multiple slots comprising punctured shared channel transmissions and a slot comprising at least one PDSCH transmission or CBG that is not punctured. Multiple slots may comprise punctured shared channel transmissions, and the reference duration may be determined to include a slot comprising at least one PDSCH transmission or CBG that is not punctured and at least one of the multiple slots comprising punctured shared channel transmissions.
  • the reference duration may be determined for each subband.
  • the reference duration may be determined in common for multiple subbands.
  • the device updates a CW based at least in part on reception of the PDSCH transmission during the reference duration.
  • the update may be performed, e.g., by the CW adjustment component 1616 of apparatus 1602.
  • Updating the CW may include one of doubling the CW based at least in part on a negative acknowledgement received by the device for the shared channel transmission or assigning the CW with a predetermined minimum value (CW min) based at least in part on a positive acknowledgement received by the device for the shared channel transmission.
  • Updating the CW may include doubling the CW based at least in part on no acknowledgement received by the device for the shared channel transmission.
  • the device may also determine reference PDSCH transmission(s) based on a relationship of the reference duration to the reference PDSCH transmission or to a PDCCH transmission for the reference PDSCH transmission.
  • the determination may be performed, e.g., by the reference transmission determination component 1614 of apparatus 1602.
  • the CW may be updated, e.g., at 1204, based on the determined reference PDSCH transmission.
  • the reference PDSCH transmission(s) may be determined based on the PDCCH transmission associated with the at least one reference PDSCH transmission being transmitted within a predetermined amount of time or a predetermined number of symbols from a start of the COT.
  • the reference PDSCH transmission(s) may be determined based on at least one of: the PDSCH(s) starting within the reference duration of the COT; the PDSCH(s) ending within the reference duration of the COT; CBG(s) of the PDSCH(s) that at least partially overlap the reference duration; and/or the PDSCH(s) having the PDCCH transmitted within the reference duration.
  • FIG. 13 is a flowchart 1300 of a method of wireless communication.
  • the method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, apparatus 1602, 1602’; the processing system 1714, which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375).
  • the processing system 1714 which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375.
  • Optional aspects are illustrated with a dashed line.
  • the base station determines an RD of a COT, the RD being based at least in part on a SCS.
  • the RS may be determined, e.g., by the reference duration determination component 1612 of apparatus 1602.
  • the reference duration may be determined based on at least one of: a predefined minimum duration, a minimum SCS supported by the base station, and/or the minimum SCS used by the base station for a PDCCH at a beginning of the COT.
  • the reference duration of the COT may be determined based on a number of slots.
  • the reference duration of the COT may be determined based on a number of symbols.
  • the COT may include a first slot having a plurality of symbols, and the reference duration of the COT may be determined based on a the number of symbols of a PDCCH transmission transmitted during the COT.
  • the reference duration may be determined based on the reference PDCCH transmission having at least one of an earliest end symbol in the first slot of the COT and/or an earliest starting symbol in the first slot of the COT.
  • the reference duration may be determined based on the reference PDCCH transmission starting within a predetermined number of symbols or a predetermined time from a beginning of the COT.
  • a first reference duration may be determined for a first SCS used for a first PDCCH in the COT and a second reference duration may be determined for a second SCS used for a second PDCCH in the COT.
  • the reference duration may be determined for each subband.
  • the reference duration may be determined in common for multiple subbands.
  • the base station determines reference PDCCH transmission(s) that are transmitted during the reference duration.
  • the reference PDCCH transmission(s) may be determined, e.g., by the reference transmission determination component 1614 of apparatus 1602.
  • An example of reference transmission(s) being determined based on PDCCH is described in connection with FIG. 10.
  • the base station may update a CW based at least in part on an uplink transmission having the at least one reference PDCCH transmission transmitted during the reference duration.
  • the CW may be updated, e.g., by the CW adjustment component 1616 of apparatus 1602. Updating the CW may include one of doubling the CW based at least in part on a negative acknowledgement received by the base station for the downlink transmission or assigning the CW with a predetermined minimum value based at least in part on a positive acknowledgement received by the base station for the downlink transmission. Updating the CW may include doubling the CW based at least in part on no acknowledgement received by the base station for the downlink transmission.
  • the CW may be updated based on each uplink transmission having a PDCCH transmission transmitted during the reference duration.
  • the CW may be updated based on each uplink transmission having a PDCCH transmission transmitted within a predetermined amount of time or a predetermined number of symbols from a start of the COT.
  • the base station may use the updated CW, as determined at 1308, the base station may use the updated CW, as determined at
  • the LBT may be performed, e.g., by reception component 1604 of apparatus 1602.
  • the communication between the base station and the UE may be performed on a shared spectrum or an unlicensed spectrum.
  • the communication may be based on NR-U.
  • FIG 14 is a flowchart 1400 of a method of wireless communication.
  • the method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, apparatus 1602, 1602’; the processing system 1714, which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375).
  • the processing system 1714 which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375.
  • Optional aspects are illustrated with a dashed line.
  • the base station determines a reference duration of a COT.
  • the determination may include aspects, e.g., as described in connection with the determinations for either of 1202 or 1302.
  • the determination may be performed, e.g., by the reference duration determination component 1612 of apparatus 1602.
  • the base station determines whether to use a reference PDSCH transmission or a reference PUSCH transmission for updating a CW.
  • the determination may be performed, e.g., by the reference transmission determination component 1614 of apparatus 1602.
  • the base station may determine to use a PDSCH transmission without using a PUSCH transmission to update the CW when the PDSCH has associated feedback and is transmitted during a period of time from the beginning of the COT.
  • the base station may determine to use the PUSCH transmission without using the PDSCH transmission to update the CW when no PDSCH having associated feedback is transmitted during the period of time from the beginning of the COT.
  • the base station may determine to use both a PDSCH transmission and a PUSCH transmission to update the CW.
  • the base station updates the CW based on at least one of the PDSCH or the
  • the CW may be updated, e.g., by the CW adjustment component 1616 of apparatus 1602. Updating the CW may include one of doubling the CW based at least in part on a negative acknowledgement received by the base station for the downlink transmission or assigning the CW with a predetermined minimum value based at least in part on a positive acknowledgement received by the base station for the downlink transmission. Updating the CW may include doubling the CW based at least in part on no acknowledgement received by the base station for the downlink transmission.
  • the base station may use the updated CW, as determined at
  • the LBT may be performed, e.g., by the reception component 1604 of apparatus 1602.
  • the communication between the base station and the UE may be performed on a shared spectrum or an unlicensed spectrum.
  • the communication may be based on NR-U.
  • Figure 16 is a conceptual data flow diagram 1600 illustrating the data flow between different means/components in an example apparatus 1602.
  • the apparatus 1602 may be a base station or a component of a base station, e.g., in communication with a UE, e.g., device 1650.
  • the apparatus may comprise a UE or a component of a UE.
  • the apparatus may include a reception component 1604 configured to receive communication from the device 1650 and a transmission component 1610 configured to transmit communication to the device.
  • the apparatus may use LBT prior to transmitting to the device, for example.
  • the apparatus 1602 may include a RD Determination Component 1612 configured to determine an RD duration such as described in connection with any of 1202, 1302, 1402; a Reference Transmission Determination Component 1614 configured to determine a reference transmission as described in connection with any of 1203, 1304, 1404; and a CW Size Adjustment Component 1615 that determines whether to update a CW and/or generates an adjusted CW 1617 based on a reference transmission 1615 or RD 1613, e.g., as described in connection with any of 1204, 1306, 1406.
  • Components 1612, 1614, and 1616 execute one of more techniques described above with reference to Figures 4, 5, and 12.
  • the apparatus 1602 may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of Figures 4, 12-14. As such, each block in the aforementioned flowcharts of Figures 4, 12-14 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer- readable medium for implementation by a processor, or some combination thereof.
  • FIG. 17 is a diagram 1700 illustrating an example of a hardware implementation for an apparatus 1602’ employing a processing system 1714.
  • the processing system 1704 may be implemented with a bus architecture, represented generally by the bus 1724.
  • the bus 1724 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1714 and the overall design constraints.
  • the bus 1724 links together various circuits including one or more processors and/or hardware components, represented by the processor 1704, the components 1604, 1606, 1610, 1612, 1614, 1616, 1640, and the computer-readable medium / memory 1706.
  • the bus 1724 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1714 includes an RD Determination Component 1612, a
  • Reference Transmission Determination Component 1614 and a CW Size Adjustment Component 1616.
  • Components 1612, 1614, 1616 execute one of more techniques described above with reference to Figures 4, 5, and 12.
  • the processing system 1714 also includes TxOP having an UL and DL Txs Handling
  • Component 1640 for executing the techniques described above in connection with Figure 14, an Uplink Centric TxOP Handling Component 1606 for executing the techniques described above in connection with Figure 13, and a CW Adjustment Component 1616 for executing the techniques described above in connection with Figure 15.
  • the processing system 1714 may be coupled to a transceiver 1710.
  • the transceiver 1710 may be coupled to a transceiver 1710.
  • the 1710 is coupled to one ormore antennas 1720.
  • the transceiver 1710 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1710 receives a signal from the one or more antennas 1720, extracts information from the received signal, and provides the extracted information to the processing system 1714.
  • the transceiver 1710 receives information from the processing system 1714, and based on the received information, generates a signal to be applied to the one or more antennas 1720.
  • the processing system 1714 includes a processor 1704 coupled to a computer-readable medium / memory 1706.
  • the processor 1704 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1706.
  • the software when executed by the processor 1704, causes the processing system 1714 to perform the various functions described previously for any particular apparatus.
  • the computer-readable medium / memory 1706 may also be used for storing data that is manipulated by the processor 1704 when executing software.
  • the processing system 1714 further includes at least one of the components 1604, 1606, 1610, 1612, 1614, 1616, 1640.
  • the components may be software components running in the processor 1704, resident/stored in the computer readable medium / memory 1706, one or more hardware components coupled to the processor 1704, or some combination thereof.
  • the apparatus 1602 for wireless communication is a base station that includes means for determining RD, means for determining a reference transmission, and means to adjust CW, means for handling UL centric TxOP, and means for handling TxOP with both UL and DL, and means for performing LBT based on an updated CW.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 1602’ and/or the processing system 1714 of the apparatus 1602’ configured to perform the functions recited by the aforementioned means.
  • the processing system 1714 may include the TX Processor 316, 368, the RX Processor 356, 370, and the controller/processor 359, 375.
  • the aforementioned means may be the TX Processor 316, 368, the RX Processor 356, 370, and the controller/processor 359, 375 configured to perform the functions recited by the aforementioned means.
  • Example 15 the apparatus of any of Examples 1-14 further includes that the reference duration is based on a non-punctured slot comprises at least one of: a first slot where all shared channel transmissions are not punctured, a second slot comprises at least one non-punctured shared channel transmission, or a third slot where at least one shared channel CBG is not punctured.
  • Example 34 is a method for wireless communication at a base station, comprising:
  • Example 40 is a computer-readable medium storing computer executable code for wireless communication at a base station, the code when executed by a processor cause the processor to determine a reference duration of a COT; determine whether to use a reference PDSCH transmission or a reference PUSCH transmission for updating a CW; and update the CW based on at least one of the reference PDSCH transmission or the reference PUSCH transmission and the reference duration.
  • Example 42 is an apparatus for wireless communication at a UE, comprises: means for determining a reference duration of a COT, the reference duration being based on a first slot of a most recent set of uplink shared channel transmissions during the COT; and means for updating a CW based at least in part on an uplink shared channel transmission during the reference duration.

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  • Computer Networks & Wireless Communication (AREA)
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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'invention concerne des techniques pour définir une durée de référence et une ou plusieurs transmission(s) de référence qui sont utilisées pour une mise à jour de fenêtre de contention pour fournir ces nouvelles fonctions. Un appareil, tel qu'un dispositif sans fil, détermine une durée de référence d'un temps d'occupation de canal (COT), la durée de référence étant basée au moins en partie sur un espacement de sous-porteuses (SCS) et basée sur la réception d'une transmission de canal partagé de liaison descendante physique (PDSCH). L'appareil met à jour une fenêtre de contention (CW) sur la base, au moins en partie, de la réception de la transmission de canal PDSCH pendant la durée de référence. Par exemple, l'appareil peut augmenter la fenêtre de contention lorsqu'un accusé de réception négatif (NACK) est reçu pour le canal PDSCH déterminé dans le temps d'occupation de canal et peut attribuer une fenêtre d'occupation avec une valeur minimale prédéterminée (CW_min) lorsqu'un accusé de réception positif (ACK) est reçu pour le canal PDSCH déterminé.
EP20737665.8A 2019-08-01 2020-06-17 Techniques de mise à jour de taille de fenêtre de contention Pending EP4008075A1 (fr)

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US16/903,226 US11778661B2 (en) 2019-08-01 2020-06-16 Techniques for determining contention window update
PCT/US2020/038220 WO2021021335A1 (fr) 2019-08-01 2020-06-17 Techniques de mise à jour de taille de fenêtre de contention

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