WO2021179114A1 - Durée de référence pour ajustement de taille de fenêtre de contention (cws) - Google Patents

Durée de référence pour ajustement de taille de fenêtre de contention (cws) Download PDF

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Publication number
WO2021179114A1
WO2021179114A1 PCT/CN2020/078398 CN2020078398W WO2021179114A1 WO 2021179114 A1 WO2021179114 A1 WO 2021179114A1 CN 2020078398 W CN2020078398 W CN 2020078398W WO 2021179114 A1 WO2021179114 A1 WO 2021179114A1
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Prior art keywords
transmission
reference duration
data
channel
during
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PCT/CN2020/078398
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English (en)
Inventor
Changlong Xu
Xiaoxia Zhang
Jing Sun
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Qualcomm Incorporated
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Priority to PCT/CN2020/078398 priority Critical patent/WO2021179114A1/fr
Publication of WO2021179114A1 publication Critical patent/WO2021179114A1/fr

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    • 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

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for contention-based access.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, 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, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • 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
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • Certain aspects provide a method for wireless communication.
  • the method generally includes determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, adjusting a size associated with a contention window (CW) based on the determination, and communicating with a wireless node during the CW having the adjusted size.
  • CW contention window
  • the apparatus generally includes a processing system configured to determine whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, adjust a size associated with a contention window (CW) based on the determination, and a transceiver configured to communicate with a wireless node during the CW having the adjusted size.
  • a processing system configured to determine whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, adjust a size associated with a contention window (CW) based on the determination, and a transceiver configured to communicate with a wireless node during the CW having the adjusted size.
  • CW contention window
  • the apparatus generally includes means for determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, means for adjusting a size associated with a contention window (CW) based on the determination, and means for communicating with a wireless node during the CW having the adjusted size.
  • CW contention window
  • Certain aspects provide a computer-readable medium having instructions stored thereon to cause a processor to determine whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, adjust a size associated with a contention window (CW) based on the determination, and communicate with a wireless node during the CW having the adjusted size.
  • a processor to determine whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration, adjust a size associated with a contention window (CW) based on the determination, and communicate with a wireless node during the CW having the adjusted size.
  • CW contention window
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended 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.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIGs. 3A and 3B illustrate a listen-before-talk (LBT) communication protocol, in accordance with certain aspects of the present disclosure.
  • LBT listen-before-talk
  • FIG. 4 illustrates multiple LBT bandwidths, each having a reference duration associated therewith, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates diagrams showing transmissions using slot aggregation, in accordance with certain aspects of the present disclosure.
  • FIG. 7 illustrates diagrams showing transmissions using multiple transmit-receive point (TRP) , in accordance with certain aspects of the present disclosure.
  • TRP transmit-receive point
  • FIG. 8 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • a transmitter device may transmit data on a data channel after a contention window (CW) and receive feedback indicating whether the data transmission was successfully decoded. Based on the feedback, the transmitter device may decide whether to adjust the CWS. For example, if the feedback is a negative acknowledgement (NACK) , the transmitter device may increase the CWS, reducing the probably of collision when transmitting data.
  • the data transmission may be transmitted using slot aggregation or repetition across transmit-receive points (TRPs) .
  • a reference duration may be considered to begin at the beginning of the data transmission, otherwise referred to as a channel occupancy time (COT) .
  • COT channel occupancy time
  • Certain aspects of the present disclosure provide techniques for determining when the reference duration ends for channel repetition (e.g., slot aggregation or repetition across TRPs) .
  • the determination of whether a CWS is to be adjusted may be based on whether transmissions during the reference duration are successful.
  • the reference duration may end at the end of the last slot of a data channel transmission with slot aggregation, or end at the end of a data channel transmission burst with slot aggregation, whichever is earlier.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • a 5G NR RAT network may be deployed.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be an NR system (e.g., a 5G NR network) .
  • the wireless communication network 100 may include a number of base stations (BSs) 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • backhaul interfaces e.g., a direct physical connection, a wireless connection, a virtual network, or the like
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • the BSs 110 communicate with user equipment (UEs) 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100.
  • the UEs 120 (e.g., 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • the BSs 110 and UEs 120 may be configured for adjusting contention window size based on a reference duration.
  • the BS 110a may include a CWS manager 112.
  • the CWS manager 112 may be configured to determine whether a data transmission (e.g., downlink data channel) using channel repetition is successful, the data transmission being during at least one reference duration; adjust a size associated with a contention window (CW) based on the determination; and communicate with a wireless node during the CW having the adjusted size, in accordance with aspects of the present disclosure.
  • the UE 120a may also include a CWS manager 122.
  • the CWS manager 122 may be configured to determine whether a data transmission (e.g., uplink data channel) using channel repetition is successful, the data transmission being during at least one reference duration; adjust a size associated with a contention window (CW) based on the determination; and communicate with a wireless node during the CW having the adjusted size, in accordance with aspects of the present disclosure.
  • a data transmission e.g., uplink data channel
  • CW contention window
  • Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations e.g., relay station 110r
  • relays or the like that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • a network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another (e.g., directly or indirectly) via wireless or wireline backhaul.
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and cell-specific reference signal (CRS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the demodulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • the controller/processor 280 and/or other processors and modules at the UE 120a may perform or direct the execution of processes for the techniques described herein.
  • the controller/processor 240 of the BS 110a has a CWS manager 241 that may be configured for adjusting CWS, according to aspects described herein.
  • the controller/processor 280 of the UE 120a may also include a CWS manager 281 that may be configured to adjust CWS, according to aspects described herein.
  • the Controller/Processor other components of the UE 120a and BS 110a may be used performing the operations described herein.
  • Listen-Before-Talk is a feature that allows for fair coexistence of wireless nodes.
  • a transmitter may first sense a medium and transmit a message if the medium is sensed to be idle.
  • an uplink (UL) data channel e.g., physical uplink shared channel (PUSCH)
  • PUSCH physical uplink shared channel
  • the UL grant may be transmitted by a base station (BS) .
  • BS base station
  • a scheduled UE may check to see if the medium is clear, and if so, then the UE may transmit on the uplink data channel after a contention window (CW) .
  • CW contention window
  • the CW may span a certain number of slots selected randomly within a contention window size (CWS) spanning between a minimum CW setting CWmin and a maximum CW setting CWmax.
  • CWS contention window size
  • each node that may occupy a medium may begin transmitting at a random time interval. If a transmission by a node is unsuccessful due to a collision between transmissions of two nodes, the CWS may be increased to reduce the chances of collision during a subsequence transmission opportunity.
  • FIGs. 3A and 3B illustrates a CW for a category-4 (CAT-4) LBT, in some aspects.
  • a transmitter e.g., transmitter 340 as illustrated in FIG. 3B
  • the defer period may include a defer duration of 16us, plus one or more defer time intervals (Td) , as illustrated in FIG. 3A.
  • Td defer time intervals
  • a quantity of n defer time intervals (Td) may be implemented, n being related to a channel access priority class (CAPC) of the node, and the typical value for Td may be 9us.
  • Td channel access priority class
  • CW 306 begins.
  • the CW 306 may have a duration of N x Td, N being a randomly selected integer uniformly distributed between 0 and a contention window size (CWS) .
  • the CWS may be updated using feedback on a channel, as described in more detail herein. Channels without explicit feedback may use the CWS last updated by channels with explicit feedback and may use the same CAPC if such channels exist. Otherwise, such channels may use the minimum CWS (CWSmin) corresponding to the CAPC.
  • a transmission 308 may occur after the CW 306.
  • the transmission 308 may be PDSCH or PUSCH.
  • the feedback for the latest channel occupancy time (COT) for which new feedback is received may be used for CWS adjustment.
  • COT channel occupancy time
  • the transmitter 340 may set the CWS to a minimum CW setting (CWmin) at block 322.
  • CWS may be set to the minimum of CW ⁇ 2 + 1 or a maximum CW setting (CWmax) .
  • transmitter 340 may adjust (increase) the CWS at block 322, reducing the chances of collision of transmission by different nodes.
  • another data transmission 324 may occur after another CW associated with the adjusted CWS.
  • the feedback window (e.g., during which HARQ feedback 320 may be received) starts at the end of a reference duration and has a duration of maximum of X ms or the duration of the transmission burst from start of the reference duration + 1 ms. If the absence of other technologies in the medium cannot be guaranteed, X may be equal to 5 ms, and X may be equal to 10 ms otherwise. If a new HARQ feedback is not available, the CW may remain the same.
  • HARQ feedback may include any implicit methods of HARQ feedback determination.
  • a reference duration 310 may begin at the beginning of the channel occupancy (CO) (e.g., beginning of transmission 308) .
  • the reference duration 310 is the period in which data transmission are considered for CWS adjustment.
  • a transmitter may only consider whether data transmission during the reference duration 310 are successful, and perform CWS adjustment accordingly.
  • FIG. 4 illustrates multiple LBT bandwidths, each having a reference duration associated therewith.
  • data may be transmitted during multiple slots 402, 404, 406 on LBT BW0, and data may be transmitted on slot 408 on LBT BW 1.
  • the reference duration for CWS adjustment is maintained per LBT bandwidth.
  • Unicast PDSCH transmission may be punctured if part of the transmission falling in a LBT bandwidth fails LBT. For example, a transmission in slot 402 and a transmission in slot 408 may be punctured.
  • a reference duration starts at the beginning of CO, and ends at the earlier one of (1) the end of the first slot where at least one unicast downlink data channel (e.g., physical downlink shared channel (PDSCH) ) is fully transmitted, or (2) the end of the first transmission burst (e.g., by the base station) that contains unicast downlink data channel (s) fully transmitted.
  • a data channel transmission is considered to be not fully transmitted if the data channel transmission is punctured (e.g., as is the case for transmissions in slots 402, 408) .
  • the reference duration may ends at the end of the first transmission burst by the base station that contains unicast data channel (s) fully transmitted.
  • the duration of the first transmission burst by the transmitter within the CO that contains unicast PDSCH (s) may be the reference duration for CWS adjustment. For instance, for LBT BW0, the reference duration 410 ends at the end of the second slot 404 since the transmission in the slot 402 is punctured. For LBT BW1, since there is only transmission in slot 408, the reference duration 412 for LBT BW1 ends at the end of slot 408 even though the transmission in slot 408 is punctured.
  • a PDSCH with slot aggregation may be introduced.
  • a transport block (TB) may be repeated over slots, and the UE may obtain the repetition gain.
  • a TB generally refers to the payload for a physical layer.
  • the UE e.g., receiver
  • the base station e.g., transmitter
  • the base station may use the ACK/NACK response from the UE to make a CWS adjustment.
  • inter-slot multiple TRP repetition may be used for data transmission (e.g., PDSCH) .
  • the reference duration for CWS adjustment may be implemented for each TRP on a per-TRP basis, as described in more detail herein.
  • FIG. 5 is a flow diagram illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 500 may be performed, for example, by wireless node, such as a BS (e.g., the BS 110a in the wireless communication network 100) , or a UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • wireless node such as a BS (e.g., the BS 110a in the wireless communication network 100)
  • a UE e.g., such as a UE 120a in the wireless communication network 100.
  • Operations 500 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2, or controller/processor 280 of FIG. 2) . Further, the transmission and reception of signals by the BS or the UE in operations 500 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2 or antennas 252 of FIG. 2) . In certain aspects, the transmission and/or reception of signals by the BS or the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 240, or controller/processor 280 of FIG. 2) obtaining and/or outputting signals. The operations 500 may alternatively be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • UE e.g., such as a UE 120a in the wireless communication network 100
  • the operations 500 may begin, at block 505, by the wireless node determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration.
  • the operations 500 may continue, at block 510, by the wireless node adjusting a size associated with a contention window (CW) based on the determination.
  • the wireless node communicates (e.g., with another wireless node) during the CW having the adjusted size.
  • FIG. 6 illustrates diagrams 600A and 600B showing transmissions using slot aggregation, in accordance with certain aspects of the present disclosure.
  • the end point of the reference duration may occur at the earlier one of (1) the end of the first slot where at least one unicast PDSCH is fully transmitted (e.g., the end of slot n) or the end of the first transmission burst by a transmitter device (e.g., BS) that contains unicast PDSCH (s) that is/are fully transmitted.
  • a wireless node may transmit data channels (e.g., PDSCH) on slots n, n+1, n+2, and n+3 using slot aggregation.
  • the reference duration 602 to be used for CWS adjustment may start at the beginning of slot n corresponding to the beginning of the COT.
  • the end of the reference duration 602 may occur at the end of slot n.
  • the end point of a reference duration may occur at the earlier one of the end of the last slot of data channel (e.g., PDSCH) with slot aggregation or the end of the data channel (e.g., PDSCH) transmission burst with slot aggregation by the transmitter device (e.g., BS) .
  • the reference duration 604 may begin at the beginning of slot n and end at the end of the last slot (slot n+3) of the data channel transmission using slot aggregation.
  • a downlink channel e.g., PDSCH
  • the techniques described herein for determination a reference duration may also be applied for an uplink data channel (e.g., PUSCH) with slot aggregation.
  • FIG. 7 illustrates diagrams 700A and 700B showing transmissions using multiple transmit-receive point (TRP) with repetition, in accordance with certain aspects of the present disclosure.
  • a PDSCH may be repeated on an intra-slot basis over two TRPs.
  • the same PDSCH may be transmitted over TRP0 and TRP1 in slot n, as shown in diagrams 700A.
  • PDSCH 704 may be transmitted in slot n on TRP 0 and PDSCH 705 may be transmitted on TRP 1, PDSCH 705 being a repeated version of PDSCH 704.
  • PDSCH 705 may be a different redundancy version of PDSCH 704.
  • the reference duration 702A for TRP 0 may start at the beginning of the COT (e.g., the beginning of PDSCH 704 in slot n) for TRP0, as shown.
  • the end point of the reference duration 702A may occur at one of the end of the first slot where at least one unicast PDSCH is fully transmitted or the end of the first transmission burst by the BS that contains unicast PDSCH (s) that are fully transmitted.
  • whether a transmission is fully transmitted may either impact all TRPs or only effect a TRP corresponding to the transmission.
  • a punctured frequency band on TRP 0 may only affect the reference duration of TRP 0.
  • the reference duration 702A begins at the beginning of PDSCH 704, but ends at the end of PDSCH 706 in slot n+1 because PDSCH 704 is punctured (e.g., is not considered to be fully transmitted) .
  • the punctured PDSCH 704 may only effect the reference duration of TRP 0. Therefore, the reference duration 702B may begin at the beginning of PDSCH 705 on TRP 1, and end at the end of PDSCH 705 since PDSCH 705 is not punctured (e.g., is fully transmitted) .
  • a punctured frequency band on TRP 0 may effect the reference durations of both TRP 0 and TRP 1.
  • the PDSCH 704 in slot n is punctured (not fully transmitted)
  • the PDSCH 705 in slot n is not punctured (is fully transmitted) .
  • the reference duration 702A ends at the end of PDSCH 706 in slot n+1
  • the reference duration 702B for TRP 1 ends at the end PDSCH 708 in slot n+1.
  • both PDSCH 704 and PDSCH 705 are considered to be not fully transmitted for purposes of determining the reference durations for TRP 0 and TRP 1.
  • FIG. 8 illustrates a communications device 800 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 5.
  • the communications device 800 includes a processing system 802 coupled to a transceiver 808.
  • the transceiver 808 is configured to transmit and receive signals for the communications device 800 via an antenna 810, such as the various signals as described herein.
  • the processing system 802 may be configured to perform processing functions for the communications device 800, including processing signals received and/or to be transmitted by the communications device 800.
  • the processing system 802 includes a processor 804 coupled to a computer-readable medium/memory 812 via a bus 806.
  • the computer-readable medium/memory 812 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 804, cause the processor 804 to perform the operations illustrated in FIG. 5, or other operations for performing the various techniques discussed herein for managing CWS.
  • computer-readable medium/memory 812 stores code 814 for determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration; code 816 for adjusting a size associated with a contention window (CW) based on the determination; and code 818 for communicating with a wireless node during the CW having the adjusted size.
  • CW contention window
  • the processor 804 has circuitry configured to implement the code stored in the computer-readable medium/memory 812.
  • the processor 804 includes circuitry 820 for determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration; circuitry 824 for adjusting a size associated with a contention window (CW) based on the determination; and circuitry 826 for communicating with a wireless node during the CW having the adjusted size.
  • circuitry 820 for determining whether a data transmission using channel repetition is successful, the data transmission being during at least one reference duration
  • circuitry 824 for adjusting a size associated with a contention window (CW) based on the determination
  • circuitry 826 for communicating with a wireless node during the CW having the adjusted size.
  • NR e.g., 5G NR
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • 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
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • NR is an emerging wireless communications technology under development.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • Certain wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a “resource block” (RB) ) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal Fast Fourier Transfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (e.g., 6 RBs) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • the basic transmission time interval (TTI) or packet duration is the 1 ms subframe.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD.
  • a subframe is still 1 ms, but the basic TTI is referred to as a slot.
  • a subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the subcarrier spacing.
  • the NR RB is 12 consecutive frequency subcarriers.
  • NR may support a base subcarrier spacing of 15 KHz and other subcarrier spacing may be defined with respect to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.
  • the symbol and slot lengths scale with the subcarrier spacing.
  • the CP length also depends on the subcarrier spacing. Beamforming may be supported and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. In some examples, MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • a scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • two or more subordinate entities may communicate with each other using sidelink signals.
  • Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications.
  • a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS) , even though the scheduling entity may be utilized for scheduling and/or control purposes.
  • the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum) .
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIG. 5.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des techniques d'accès basé sur la contention. Un procédé de communication sans fil consiste à déterminer si une transmission de données utilisant une répétition de canal est réussie, la transmission de données étant effectuée pendant au moins une durée de référence (505), à ajuster une taille associée à une fenêtre de contention (CW) sur la base de la détermination (510), et à communiquer avec un nœud sans fil pendant la CW ayant la taille ajustée (515).
PCT/CN2020/078398 2020-03-09 2020-03-09 Durée de référence pour ajustement de taille de fenêtre de contention (cws) WO2021179114A1 (fr)

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WO2023050137A1 (fr) * 2021-09-29 2023-04-06 Nec Corporation Procédé, dispositif et support lisible par ordinateur destinés aux communications
WO2023128620A1 (fr) * 2021-12-30 2023-07-06 Samsung Electronics Co., Ltd. Procédé et appareil d'accès à un canal pour la transmission et la réception d'informations de liaison latérale dans une bande sans licence

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CN101998662A (zh) * 2009-08-18 2011-03-30 英特尔公司 调整用于无线传送的竞争窗口的装置、系统和方法
CN106559907A (zh) * 2015-09-24 2017-04-05 株式会社Ntt都科摩 确定竞争窗口大小的方法、无线基站和移动台
US20180343205A1 (en) * 2015-09-14 2018-11-29 Lenovo Innovations Limited (Hong Kong) Contention window size adjustment in a wireless communication system
WO2020022523A1 (fr) * 2018-07-26 2020-01-30 Sharp Kabushiki Kaisha Stations de base et procédés associés
WO2020029186A1 (fr) * 2018-08-09 2020-02-13 Lenovo (Beijing) Limited Ajustement d'une fenêtre de conflit

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CN101998662A (zh) * 2009-08-18 2011-03-30 英特尔公司 调整用于无线传送的竞争窗口的装置、系统和方法
US20180343205A1 (en) * 2015-09-14 2018-11-29 Lenovo Innovations Limited (Hong Kong) Contention window size adjustment in a wireless communication system
CN106559907A (zh) * 2015-09-24 2017-04-05 株式会社Ntt都科摩 确定竞争窗口大小的方法、无线基站和移动台
WO2020022523A1 (fr) * 2018-07-26 2020-01-30 Sharp Kabushiki Kaisha Stations de base et procédés associés
WO2020029186A1 (fr) * 2018-08-09 2020-02-13 Lenovo (Beijing) Limited Ajustement d'une fenêtre de conflit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023050137A1 (fr) * 2021-09-29 2023-04-06 Nec Corporation Procédé, dispositif et support lisible par ordinateur destinés aux communications
WO2023128620A1 (fr) * 2021-12-30 2023-07-06 Samsung Electronics Co., Ltd. Procédé et appareil d'accès à un canal pour la transmission et la réception d'informations de liaison latérale dans une bande sans licence

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