WO2021068851A1 - A method of cws adaptation pucch - Google Patents

A method of cws adaptation pucch 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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Prior art keywords
harq process
burst
reception status
determines
reference burst
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PCT/CN2020/119661
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French (fr)
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Hao Lin
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Guangdong Oppo Mobile Telecommunications Corp., Ltd.
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Publication of WO2021068851A1 publication Critical patent/WO2021068851A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • 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)
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Abstract

The disclosure is related to 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: - determining a reception status of the reference burst by the network; - determining the CWS based on the reception status of the reference burst; o if the reception status of the reference burst is successful, UE sets the CWS to a minimum allowed value; o if the reception status of the reference burst is failed, UE sets the CWS to a next allowed value higher than the current CWS value; o If the reception status of the reference burst is unknown, UE does not change the current CWS value.

Description

A METHOD OF CWS ADAPTATION PUCCH TECHNICAL FIELD
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. The present disclosure is applicable to 5G NR-U (NR in unlicensed spectrum) .
BACKGROUND
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.
In order to allow various communication systems that use unlicensed spectrum for wireless communication to coexist friendly in the spectrum, some countries or regions specify regulatory requirements that must be met to use unlicensed spectrum. For example, 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) . On the unlicensed carrier, for the channel occupation time obtained by the base station, it may share the channel occupation time to the UE for transmitting the uplink signal or the uplink channel. In other words, when the base station shares its own channel occupancy time with the UE, 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.
CWS adaptation
The purpose of a contention window (CW) is for congestion control and to avoid collisions of data when lots of devices want to transmit simultaneously. 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.
If 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.
SUMMARY
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:
- determining a reception status of the reference burst by the network;
- determining the CWS based on the reception status of the reference burst, such that:
○ if the reception status of the reference burst is successful, UE sets the CWS to a minimum allowed value;
○ if the reception status of the reference burst is failed, UE sets the CWS to a next allowed value higher than the current CWS value; or
○ if the reception status of the reference burst is unknown, UE does not change the current CWS value.
Advantageously, the UE determines the reception status of the reference burst based on a received status of the A/N information such that:
- if the A/N information reception status is successful, UE determines the reference burst reception status as successful;
- if the A/N information reception status is failed, UE determines the reference burst reception status as failed; or
- if the A/N information reception status is unknown, UE determines the reference burst reception status as unknown.
Advantageously, 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.
Advantageously, the first indication is a New Feedback Indication (NFI) indicating if the  reference burst uses group-based A/N feedback, such that:
- if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is toggled, UE determines A/N reception status as successful;
- if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is not toggled, UE determines A/N reception status as failed; or
- if the NFI is associated with at least one group that is different from any of the groups in the reference burst, UE determines DL grant DCI is not present.
Advantageously, 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.
Advantageously, 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.
Advantageously, 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:
- if 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, UE determines A/N reception status as successful
- if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as failed, or
- if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines DL grant DCI is not present.
Advantageously, 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:
- if 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;
- if 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 NDI associated with this HARQ  process ID is not toggled, UE determines A/N reception status as failed, or
- if 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 NDI associated with this HARQ process ID is not toggled, UE determines DL grant DCI is not present.
Advantageously, 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:
- if 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;
- if 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
- if 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 NDI associated with this HARQ process ID is not toggled, UE determines DL grant DCI is not present.
Advantageously, DL grant DCI is a downlink control signal scheduling physical downlink shared channel (PDSCH) .
Advantageously, 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.
Advantageously, 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.
Advantageously, 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.
Advantageously, the first indication is a New Feedback Indication (NFI) indicating if the reference burst uses group-based A/N feedback, such that:
- if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is toggled, UE determines A/N reception status as  successful;
- if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is not toggled, UE determines A/N reception status as failed; or
- if the NFI is associated with at least one group that is different from any of the groups in the reference burst, UE determines A/N reception status as unknown.
Advantageously, 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:
- if 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, UE determines A/N reception status as successful
- if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as failed, or
- if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as unknown.
Advantageously, 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:
- if 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;
- if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as failed, or
- if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as unknown.
Advantageously, 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:
- if 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;
- if 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
- if 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 NDI associated with this HARQ process ID is not toggled, 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.
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.
BRIEF DESCRIPTION OF THE DRAWINGS
The appended drawings required in description of embodiments or the prior art will be briefly described below.
-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.
DETAILED DESCRIPTION
Example 1
Before the concerned UL burst 1 transmission, (assume that burst 1 is based on Cat 4 LBT with priority class 2) , 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. In Figure 1, UL burst 3 is the most recently transmitted UL burst that satisfy the reference burst condition.
Example 2
As shown in Figure 2, although 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.
Example 3
As shown in Figure 3, 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.
Example 4
As shown in Figure 4, referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of group-based AN feedback, the PUCCH carries the AN feedback of group 0. Between reference UL burst and burst 1, 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.
Example 5
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of group-based AN feedback, the PUCCH carries the AN feedback of group 0. Between reference UL burst and burst 1, 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.
Example 6
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of group-based AN feedback, the PUCCH carries the AN feedback of group 0. Between reference UL burst and burst 1, 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. Then UE determines the AN reception status is failed, thus UE determines that CWS for UL burst 1 is doubled.
Example 7
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of group-based AN feedback, the PUCCH carries the AN feedback of group 0. Between reference UL burst and burst 1, UE receives a DL grant DCI does not have NFI field but uses other fields to indicate that NFI of group 0 is toggled. Then UE determines the AN reception status is successful, thus UE determines that CWS for UL burst 1 is set to min value.
Example 8
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of group-based AN feedback, the PUCCH carries the AN feedback of group 0. Between reference UL burst and burst 1, 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.
Example 9
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of non group-based AN feedback, the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) . Between reference UL burst and burst 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.
Example 10
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of non group-based AN feedback, the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) . Between reference UL burst and burst 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.
Example 11
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of non group-based AN feedback, the PUCCH carries the AN feedback of HARQ process  ID#1 (HARQ#1) . Between reference UL burst and burst 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.
Example 12
Referent UL burst contains only PUCCH and PUCCH contains at least AN feedback. In the case of non group-based AN feedback, the PUCCH carries the AN feedback of HARQ process ID#1 (HARQ#1) =Ack. Between reference UL burst and burst 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.
List of abbreviations in the description and drawings:
Acronyms Full name
LTE Long Term Evolution
LTE-A Advanced long term evolution
NR New Radio
NR-U New Radio-unlicensed
gNB Next generation base station Node B
UE User Equipment
PDCCH Physical Downlink Control CHannel
PDSCH Physical Downlink Shared CHannel
SS Search Space
CORESET Control Resource Set
DMRS DeModulation Reference Signal
DCI Downlink control information
SB Subband
LBT Listen Before Talk
CCE Control Channel Element
COT Channel Occupancy Time
MCOT Maximum Channel Occupancy Time
RRC Radio Resource Control
CG-PDCCH Common Ground-Physical Downlink Control CHannel
In the above description, 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) . The present disclosure can be applied to other mobile networks, in particular to mobile network of any further generation cellular network technology (6G, etc. ) .
The above is only a specific implementation manner of the present disclosure, the protection scope of the present disclosure is not limited thereto, and changes or substitutions that can easily be thought of by those skilled in the art within the technical scope disclosed in the present disclosure should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.
The various embodiments /examples, aspects and features, if any, described in this specification that do not fall under the scope of the independent claims are to be interpreted as examples useful for understanding various embodiments of the disclosure.

Claims (19)

  1. 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:
    - determining a reception status of the reference burst by the network;
    - determining the CWS based on the reception status of the reference burst, such that:
    ο if the reception status of the reference burst is successful, UE sets the CWS to a minimum allowed value;
    ο if the reception status of the reference burst is failed, UE sets the CWS to a next allowed value higher than the current CWS value;
    ο if the reception status of the reference burst is unknown, UE does not change the current CWS value.
  2. The method for determining a contention window size (CWS) according to claim 1, wherein the UE determines the reception status of the reference burst based on a received status of the A/N information such that:
    - if the A/N information reception status is successful, UE determines the reference burst reception status as successful;
    - if the A/N information reception status is failed, UE determines the reference burst reception status as failed; or
    - if the A/N information reception status is unknown, UE determines the reference burst reception status as unknown.
  3. The method for determining a contention window size (CWS) according to claim 2, wherein 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 UE does not receive any DL grant DCI, UE determines DL grant DCI is not present and UE determines the A/N reception status as unknown.
  4. The method for determining a contention window size (CWS) according to claim 3, wherein the first indication is a New Feedback Indication (NFI) indicating if the reference burst uses group-based A/N feedback, such that:
    - if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is toggled, UE determines A/N reception status as successful;
    - if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is not toggled, UE determines A/N reception status as failed; or
    - if the NFI is associated with at least one group that is different from any of the groups in the reference burst, UE determines DL grant DCI is not present.
  5. The method for determining a contention window size (CWS) according to claim 4, wherein 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.
  6. The method for determining a contention window size (CWS) according to claim 4, wherein 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.
  7. The method for determining a contention window size (CWS) according to claim 3, wherein 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:
    - if 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, UE determines A/N reception status as successful
    - if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as failed, or
    - if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines DL grant DCI is not present.
  8. The method for determining a contention window size (CWS) according to claim 3, wherein 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:
    - if 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;
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as failed, or
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines DL grant DCI is not present.
  9. The method for determining a contention window size (CWS) according to claim 3, wherein 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:
    - if 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;
    - if 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
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines DL grant DCI is not present.
  10. The method for determining a contention window size (CWS) according to any of claims 7 to 9, wherein DL grant DCI is a downlink control signal scheduling physical downlink shared channel (PDSCH) .
  11. The method for determining a contention window size (CWS) according to any of claims 7 to 9, wherein 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.
  12. The method for determining a contention window size (CWS) according to any of claims 7 to 9, wherein 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.
  13. The method for determining a contention window size (CWS) according to claim 2, wherein 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.
  14. The method for determining a contention window size (CWS) according to claim 13, wherein the first indication is a New Feedback Indication (NFI) indicating if the reference burst uses group-based A/N feedback, such that:
    - if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is toggled, UE determines A/N reception status as successful;
    - if the NFI is associated with at least one group that is same as at least one group of the A/N reporting in the reference burst and if NFI is not toggled, UE determines A/N reception status as failed; or
    - if the NFI is associated with at least one group that is different from any of the groups in the reference burst, UE determines A/N reception status as unknown.
  15. The method for determining a contention window size (CWS) according to claim 13, wherein 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:
    - if 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, UE determines A/N reception status as successful
    - if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as failed, or
    - if the DCI assigns HARQ process ID that is different from the HARQ process ID associated with the reported A/N in the reference burst, UE determines A/N reception status as unknown.
  16. The method for determining a contention window size (CWS) according to claim 13, wherein 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:
    - if 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;
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as failed, or
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as unknown.
  17. The method for determining a contention window size (CWS) according to claim 3, wherein 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:
    - if 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;
    - if 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
    - if 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 NDI associated with this HARQ process ID is not toggled, UE determines A/N reception status as unknown.
  18. 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 claims 1 to 17.
  19. A computer readable medium comprising program instructions for causing a user equipment to perform the steps of the method according to any of claims 1 to 17.
PCT/CN2020/119661 2019-10-06 2020-09-30 A method of cws adaptation pucch WO2021068851A1 (en)

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