WO2021068851A1 - Procédé de pucch à adaptation de cws - Google Patents

Procédé de pucch à adaptation de cws Download PDF

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Publication number
WO2021068851A1
WO2021068851A1 PCT/CN2020/119661 CN2020119661W WO2021068851A1 WO 2021068851 A1 WO2021068851 A1 WO 2021068851A1 CN 2020119661 W CN2020119661 W CN 2020119661W WO 2021068851 A1 WO2021068851 A1 WO 2021068851A1
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WO
WIPO (PCT)
Prior art keywords
harq process
burst
reception status
determines
reference burst
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PCT/CN2020/119661
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English (en)
Inventor
Hao Lin
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Guangdong Oppo Mobile Telecommunications Corp., Ltd.
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Filing date
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Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Publication of WO2021068851A1 publication Critical patent/WO2021068851A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a method of CWS adaptation. More particularly, the present disclosure provides a method of realizing contention window size adaptation based on the previous UL burst which only contains PUCCH carrying Ack/Nack information.
  • the communication technology is for example a 5G (fifth generation) network using the 5G NR (New Radio) as radio access technology (RAT) defined by 3GPP.
  • 5G NR-U NR in unlicensed spectrum
  • the unlicensed spectrum is a shared spectrum.
  • the communication equipment in different communication systems can use the spectrum as long as it meets the regulatory requirements set by the country or region on the spectrum, and does not need to apply for a proprietary spectrum authorization from the government.
  • the communication device follows the principle of “Listen Before Talk (LBT) ” , that is, the device needs to perform channel sensing before transmitting a signal on the channel. Only when the LBT outcome shows that the channel is idle, the device can perform signal transmission; otherwise, the device cannot perform signal transmission. In order to ensure fairness, once a communication device successfully occupies the channel, the transmission duration cannot exceed the Maximum Channel Occupancy Time (MCOT) .
  • LBT Listen Before Talk
  • the base station may share the channel occupation time to the UE for transmitting the uplink signal or the uplink channel.
  • the UE can use the LBT mode with higher priority than that used by the UE itself to obtain the channel, thereby obtaining the channel with greater probability.
  • a contention window (CW) is for congestion control and to avoid collisions of data when lots of devices want to transmit simultaneously.
  • CW contention window
  • a transmitter of a UE Before initiating a transmission, a transmitter of a UE has to check the success of the previous burst. If it was successful, the transmitter will set a minimum value for the contention window size (CWS) . Otherwise the transmitter has to double the contention window size in order to avoid potential collision with hidden nodes.
  • CWS contention window size
  • the reference uplink burst based on which the UE decides to adapt the CWS carries only PUCCH. What is the UE behavior for CWS adaptation.
  • a first object of the present disclosure is a method, performed by a user equipment (UE) , for determining a contention window size (CWS) for category 4 LBT (CAT 4 LBT) before the transmission of uplink burst (uplink burst 1) , based on a reference burst which contains only physical uplink control channel (PUCCH) carrying at least an acknowledgement/non-acknowledgment (A/N) information, the method comprises the steps of:
  • UE sets the CWS to a minimum allowed value
  • UE sets the CWS to a next allowed value higher than the current CWS value
  • the UE determines the reception status of the reference burst based on a received status of the A/N information such that:
  • UE determines the reference burst reception status as successful
  • UE determines the reference burst reception status as failed
  • UE determines the reference burst reception status as unknown.
  • the UE determines the A/N reception status based on a first indication by at least one download (DL) grant Downlink Control Information (DCI) received between burst 1 and the reference burst, the first indication indicating the A/N reception status as successful or failed, such that if the DL grant DCI is not present, UE determines the A/N reception status as unknown.
  • DCI Download Control Information
  • the first indication is a New Feedback Indication (NFI) indicating if the reference burst uses group-based A/N feedback, such that:
  • NFI New Feedback Indication
  • UE determines A/N reception status as successful
  • UE determines DL grant DCI is not present.
  • the NFI indication is explicit which means that the DCI has an explicit information field for NFI that is explicitly associated with an explicit information field for group ID.
  • the NFI indication is implicit which means that the DCI does not have explicit information field for NFI, but using other information field to indicate NFI status, the association between other information fields and NFI status being pre-defined.
  • the first indication is an Hybrid Automatic Repeat reQuest (HARQ) process ID indication if the reference burst does not use group-based A/N feedback, such that:
  • HARQ Hybrid Automatic Repeat reQuest
  • UE determines A/N reception status as successful
  • UE determines A/N reception status as failed, or
  • UE determines DL grant DCI is not present.
  • the first indication is an Hybrid Automatic Repeat reQuest (HARQ) process ID indication and a New Data Indication (NDI) , if the reference burst does not use group-based A/N feedback, such that:
  • HARQ Hybrid Automatic Repeat reQuest
  • NDI New Data Indication
  • the DCI assigns at least one HARQ process ID that is the same as the HARQ process ID associated with the reported A/N in the reference burst, and the NDI associated with this HARQ process ID is toggled, UE determines A/N reception status as successful;
  • UE determines A/N reception status as failed, or
  • UE determines DL grant DCI is not present.
  • the first indication can be HARQ process ID indication and New Data Indication (NDI) and A/N status in the reference upload (UL) burst, if the reference burst does not use group-based A/N feedback, such that:
  • the DCI assigns at least one HARQ process ID that is the same as the HARQ process ID associated with the reported A/N in the reference burst, and the reported AN status is ACK for this HARQ process ID, and the NDI associated with this HARQ process ID is toggled, UE determines A/N reception status as successful;
  • the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, and the reported A/N status is ACK and the NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as failed, or
  • UE determines DL grant DCI is not present.
  • DL grant DCI is a downlink control signal scheduling physical downlink shared channel (PDSCH) .
  • PDSCH physical downlink shared channel
  • the reference burst is the whole UL burst most recently transmitted, also based on category 4 LBT, before the uplink burst 1 and has the same LBT priority class as uplink burst 1.
  • the reference burst is a portion of the UL burst most recently transmitted, also based on category 4 LBT, before the uplink burst 1 and has the same LBT priority class as uplink burst 1.
  • the UE determines the A/N reception status based on a first indication by at least one download (DL) grant Downlink Control Information (DCI) received between burst 1 and the reference burst, the first indication indicating the A/N reception status as successful or failed.
  • DCI Downlink Control Information
  • the first indication is a New Feedback Indication (NFI) indicating if the reference burst uses group-based A/N feedback, such that:
  • NFI New Feedback Indication
  • UE determines A/N reception status as successful
  • UE determines A/N reception status as unknown.
  • the first indication is an Hybrid Automatic Repeat reQuest (HARQ) process ID indication if the reference burst does not use group-based A/N feedback, such that:
  • HARQ Hybrid Automatic Repeat reQuest
  • UE determines A/N reception status as successful
  • UE determines A/N reception status as failed, or
  • UE determines A/N reception status as unknown.
  • the first indication is an Hybrid Automatic Repeat reQuest (HARQ) process ID indication and a New Data Indication (NDI) , if the reference burst does not use group-based A/N feedback, such that:
  • HARQ Hybrid Automatic Repeat reQuest
  • NDI New Data Indication
  • the DCI assigns at least one HARQ process ID that is the same as the HARQ process ID associated with the reported A/N in the reference burst, and the NDI associated with this HARQ process ID is toggled, UE determines A/N reception status as successful;
  • UE determines A/N reception status as failed, or
  • UE determines A/N reception status as unknown.
  • the first indication can be HARQ process ID indication and New Data Indication (NDI) and A/N status in the reference upload (UL) burst, if the reference burst does not use group-based A/N feedback, such that:
  • the DCI assigns at least one HARQ process ID that is the same as the HARQ process ID associated with the reported A/N in the reference burst, and the reported AN status is ACK for this HARQ process ID, and the NDI associated with this HARQ process ID is toggled, UE determines A/N reception status as successful;
  • the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, and the reported A/N status is ACK and the NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as failed, or
  • UE determines A/N reception status as unknown.
  • a second object of the present disclosure is a user equipment (UE) , operable for determining a contention window size (CWS) in a mobile telecommunication network, comprising one or more processors configured to control the execution of the method defined in the first object.
  • UE user equipment
  • CWS contention window size
  • a third object of the present disclosure is a computer readable medium comprising program instructions for causing a user equipment to perform the steps of the method according to the first object.
  • FIG. 1 shows an illustration of reference UL burst determination
  • FIG. 2 shows another illustration of reference UL burst determination
  • FIG. 3 shows an illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 4 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 5 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 6 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 7 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 8 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 9 shows another illustration of CWS determination based on reception status of the reference UL burst
  • FIG. 10 shows another illustration of CWS determination based on reception status of the reference UL burst
  • FIG. 11 shows another illustration of CWS determination based on reception status of the reference UL burst ;
  • FIG. 12 shows another illustration of CWS determination based on reception status of the reference UL burst.
  • UE determines the reference burst is the most recently transmitted UL burst that was also based on Cat 4 LBT with the same priority class.
  • UL burst 3 is the most recently transmitted UL burst that satisfy the reference burst condition.
  • the UL burst 3 is the most transmitted burst before burst 1, it does not have the same LBT priority class, thus the UL burst 2 is the reference UL burst.
  • referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. Between reference UL burst and burst 1, there is no DL grant DCI. UE determines the AN reception status is unknown, thus determines that CWS for UL burst 1 is not changed.
  • referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of group 0.
  • UE receives a DL grant DCI indicates that NFI of group 0 is toggled. Then UE determines the AN reception status is successful, thus sets CWS to the minimum value.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of group 0.
  • UE receives a DL grant DCI indicates that NFI of group 0 is not toggled. Then UE determines the AN reception status is failed, thus determines that CWS for UL burst 1 is doubled.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of group 0.
  • UE receives a DL grant DCI does not have NFI field but uses other fields to indicate that NFI of group 0 is not toggled.
  • UE determines the AN reception status is failed, thus UE determines that CWS for UL burst 1 is doubled.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of group 0.
  • UE receives a DL grant DCI does not have NFI field but uses other fields to indicate that NFI of group 0 is toggled.
  • UE determines the AN reception status is successful, thus UE determines that CWS for UL burst 1 is set to min value.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of group 0.
  • UE receives a DL grant DCI indicates NFI of group 1 as toggled. Since group 1 is not the same as the AN group reported in the reference burst , UE does not count this DCI as a valid DL grant DCI thus UE determines the DL grant DCI is not present.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) .
  • HARQ#1 HARQ process ID#1
  • UE receives a DL grant DCI assigns HARQ#1
  • UE determines the AN reception status is successful thus sets the CWS to the minimum value.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) .
  • HARQ#1 HARQ#1
  • UE receives a DL grant DCI assigns HARQ#0. Since the assigned HARQ process ID is not the one in reference burst, UE determines the DL grant DCI is not present.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) .
  • UE receives a DL grant DCI assigns HARQ#1 and NDI is toggled, UE determines the AN reception status is successful thus sets the CWS to the minimum value.
  • Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback.
  • UE receives a DL grant DCI assigns HARQ#1 and NDI is toggled, UE determines the AN reception status is successful thus sets the CWS to the minimum value.
  • the mobile telecommunication system is a 5G mobile network comprising a 5G NR access network.
  • the present example embodiment is applicable to NR in unlicensed spectrum (NR-U) .
  • NR-U unlicensed spectrum
  • the present disclosure can be applied to other mobile networks, in particular to mobile network of any further generation cellular network technology (6G, etc. ) .

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

Abstract

La divulgation concerne un procédé, mis en œuvre par un équipement utilisateur (UE), permettant de déterminer une taille de fenêtre de contention (CWS) pour une procédure « écouter avant de parler » (LBT) de catégorie 4 (CAT 4 LBT) avant la transmission d'une rafale de liaison montante (rafale de liaison montante 1), sur la base d'une rafale de référence qui contient uniquement un canal de commande de liaison montante physique (PUCCH) portant au moins une information d'accusé de réception/non accusé de réception (A/N), le procédé comprend les étapes suivantes de : - détermination d'un état de réception de la rafale de référence par le réseau ; - détermination de la CWS sur la base de l'état de réception de la rafale de référence ; ou si l'état de réception de la rafale de référence est réussi, l'UE règle la CWS à une valeur autorisée minimale ; ou si l'état de réception de la rafale de référence est défaillant, l'UE règle la CWS à une valeur autorisée suivante supérieure à la valeur actuelle de la CWS ; ou si l'état de réception de la rafale de référence est inconnu, l'UE ne change pas la valeur actuelle de la CWS.
PCT/CN2020/119661 2019-10-06 2020-09-30 Procédé de pucch à adaptation de cws WO2021068851A1 (fr)

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WO2020190194A1 (fr) * 2019-03-18 2020-09-24 Telefonaktiebolaget Lm Ericsson (Publ) Équipement utilisateur, nœud de réseau radio et procédés mis en œuvre dans ceux-ci permettant de gérer une communication

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Publication number Priority date Publication date Assignee Title
US20180288790A1 (en) * 2015-08-20 2018-10-04 Lg Electronics Inc Method and apparatus for controlling contention window size in radio access system supporting unlicensed band
US20190037601A1 (en) * 2016-03-30 2019-01-31 Wilus Institute Of Standards And Technology Inc. Channel access method, device and system in unlicensed band
CN109417823A (zh) * 2016-05-06 2019-03-01 瑞典爱立信有限公司 用于未许可频谱中的上行链路的lbt参数
WO2020190194A1 (fr) * 2019-03-18 2020-09-24 Telefonaktiebolaget Lm Ericsson (Publ) Équipement utilisateur, nœud de réseau radio et procédés mis en œuvre dans ceux-ci permettant de gérer une communication

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LG ELECTRONICS: "Channel access procedure for NR-U", 3GPP DRAFT; R1-1906675, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20190513 - 20190517, 4 May 2019 (2019-05-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051708711 *
NOKIA, ALCATEL-LUCENT SHANGHAI BELL: "Remaining Issues on Channel Access for LAA UL", 3GPP DRAFT; R1-167626 CHANNEL ACCESS FOR LAA UL - FINAL, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Gothenburg, Sweden; 20160822 - 20160826, 21 August 2016 (2016-08-21), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051140763 *

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