WO2021068847A1 - A method of cws adaptation srs - Google Patents

A method of cws adaptation srs Download PDF

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Publication number
WO2021068847A1
WO2021068847A1 PCT/CN2020/119580 CN2020119580W WO2021068847A1 WO 2021068847 A1 WO2021068847 A1 WO 2021068847A1 CN 2020119580 W CN2020119580 W CN 2020119580W WO 2021068847 A1 WO2021068847 A1 WO 2021068847A1
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Prior art keywords
burst
cws
uplink burst
determining
reception status
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PCT/CN2020/119580
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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 WO2021068847A1 publication Critical patent/WO2021068847A1/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]

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  • 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 for the base station if the previous DL burst only contains PDCCH triggering uplink burst, e.g. SRS, PRACH and PUSCH. Moreover, this invention provides a method for UE to adapt CWS when the previous uplink burst contains only SRS transmission.
  • PDCCH triggering uplink burst e.g. SRS, PRACH and PUSCH.
  • 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 the 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 devices successfully occupies the channel, the transmission duration cannot exceed the Maximum Channel Occupancy Time (MCOT) .
  • LBT Listen Before Talk
  • MCOT Maximum Channel Occupancy Time
  • 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.
  • a contention window (CW) is for congestion control and to avoid collisions of data when lots of devices want to transmit simultaneously.
  • the transmitter Before initiate a transmission, the transmitter has to check the success of the previous burst. If it was successful, the transmitter will set a min value for the contention window size (CWS) . Otherwise the transmitter has to double the contention window size in order to avoid potential collision with the hidden nodes.
  • CWS contention window size
  • a first object of the present disclosure is a method, performed by a base-station (BS) , for determining CWS for Category 4 LBT before the transmission of downlink burst (downlink burst 1) , based on the reference downlink burst which contains only PDCCH triggering uplink burst, the method comprises the steps of:
  • BS sets the CWS to the minimum allowed value
  • BS sets the CWS to the next higher allowed value.
  • the BS determines the reference burst reception status based on status of SRS triggering information reception, such that:
  • BS determines the reference burst reception status is successful
  • BS determines the reference burst reception status is failed
  • the BS determines the uplink burst triggering information reception status based on detection of the presence of triggered uplink burst in the allocated time frequency resources for triggered uplink burst transmission, such that:
  • BS determines the uplink burst triggering information reception is successful
  • BS determines the uplink burst triggering information reception is failed.
  • the reference downlink burst is most recently transmitted burst, also based on category 4 LBT, before downlink burst 1 and has the same LBT priority class as downlink burst 1.
  • the triggered uplink burst is SRS and/or PRACH and/or PUSCH. If the triggered uplink burst is SRS, the triggered uplink burst is detected meaning the BS detects the allocated SRS sequence in the allocated time frequency resources. If triggered uplink burst is PRACH, the triggered uplink burst is detected meaning the BS detects the allocated PRACH sequence in the allocated time frequency resources. If triggered uplink burst is PUSCH, the triggered uplink burst is detected meaning the BS detects the PUSCH, in the allocated time frequency resources, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the trigger signal is addressed.
  • a second object of the present disclosure is a method, performed by a user equipment (UE) , for determining CWS for Category 4 LBT before the transmission of uplink burst (uplink burst 1) , based on the reference uplink burst which contains only SRS, the method comprises the step of determining the CWS which remains at the same value.
  • UE user equipment
  • the reference uplink burst is most recently transmitted burst, also based on category 4 LBT, before uplink burst 1 and has the same LBT priority class as uplink burst 1.
  • a third object of the present disclosure is a base station (BS) , 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.
  • BS base station
  • CWS contention window size
  • a fourth object of the present disclosure is a computer readable medium comprising program instructions for causing a base station to perform the steps of the method according to the first object.
  • a fifth object of the present disclosure is a user equipment, 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 second object.
  • CWS contention window size
  • a sixth 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 second object.
  • - Fig. 1 shows an illustration of BS CWS determination based on reception status of the reference DL burst
  • FIG. 2 shows another illustration of BS CWS determination based on reception status of the reference DL burst
  • FIG. 3 shows another illustration of BS CWS determination based on reception status of the reference DL burst
  • FIG. 4 shows another illustration of BS CWS determination based on reception status of the reference DL burst
  • FIG. 5 shows another illustration of BS CWS determination based on reception status of the reference DL burst
  • FIG. 6 shows another illustration of BS CWS determination based on reception status of the reference DL burst
  • Fig. 7 shows another illustration where CWS is not updated if Ref UL burst only contains SRS.
  • BS detects the allocated resource for SRS transmission with the allocated SRS sequence. If the BS detects SRS, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
  • BS detects the allocated resource for SRS transmission with the allocated SRS sequence. If the BS does not detect SRS, BS determines the reception of reference DL burst is failed thus sets the CWS to the next higher allowed value.
  • BS detects the allocated resource for PRACH transmission with the allocated PRACH sequence. If the BS detects PRACH, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
  • BS If the reference DL burst only contains PDCCH triggering PRACH, BS detects the allocated resource for PRACH transmission with the allocated PRACH sequence. If the BS does not detect PRACH, BS determines the reception of reference DL burst is successful thus sets the CWS to the next higher allowed value.
  • BS detects the allocated resource for PUSCH, in the allocated resource, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the triggering information is addressed. If the BS detects PUSCH, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
  • BS detects the allocated resource for PUSCH, in the allocated resource, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the triggering information is addressed. If the BS does not detect PUSCH, BS determines the reception of reference DL burst is successful thus sets the CWS to the next higher allowed 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure is related to a method, performed by a base-station (BS), for determining CWS for Category 4 LBT before the transmission of downlink burst (downlink burst 1), based on the reference downlink burst which contains only PDCCH triggering uplink burst, the method comprises the steps of: - determining the reception status of the reference burst by the network; - determining the CWS based on the reception status of the reference burst, such that: o if the reception status of the reference burst is successful, BS sets the CWS to the minimum allowed value if the reception status of the reference burst is failed, BS sets the CWS to the next higher allowed value.

Description

A METHOD OF CWS ADAPTATION SRS 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 for the base station if the previous DL burst only contains PDCCH triggering uplink burst, e.g. SRS, PRACH and PUSCH. Moreover, this invention provides a method for UE to adapt CWS when the previous uplink burst contains only SRS transmission.
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 the 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 devices 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 initiate a transmission, the transmitter has to check the success of the previous burst. If it was successful, the transmitter will set a min value for the contention window size (CWS) . Otherwise the transmitter has to double the contention window size in order to avoid potential collision with the hidden nodes.
It is an open question how the BS will adapt the CWS if the previous DL burst only contains PDCCH triggering uplink burst containing SRS, PRACH and PUSCH. Also how the UE will adapt the CWS if the previous UL burst only contains SRS.
SUMMARY
A first object of the present disclosure is a method, performed by a base-station (BS) , for determining CWS for Category 4 LBT before the transmission of downlink burst (downlink burst 1) , based on the reference downlink burst which contains only PDCCH triggering uplink burst, the method comprises the steps of:
- determining the reception status of the reference burst by the network;
- determining the CWS based on the reception status of the reference burst, such that:
o if the reception status of the reference burst is successful, BS sets the CWS to the minimum allowed value
o if the reception status of the reference burst is failed, BS sets the CWS to the next higher allowed value.
Advantageously, the BS determines the reference burst reception status based on status of SRS triggering information reception, such that:
- if uplink burst triggering information reception status is successful, BS determines the reference burst reception status is successful;
- if uplink burst triggering information reception status is failed, BS determines the reference burst reception status is failed
Advantageously, the BS determines the uplink burst triggering information reception status based on detection of the presence of triggered uplink burst in the allocated time frequency resources for triggered uplink burst transmission, such that:
- if triggered uplink burst is detected, BS determines the uplink burst triggering information reception is successful;
- if triggered uplink burst is not detected, BS determines the uplink burst triggering information reception is failed.
Advantageously, the reference downlink burst is most recently transmitted burst, also based on category 4 LBT, before downlink burst 1 and has the same LBT priority class as downlink  burst 1.
Advantageously, the triggered uplink burst is SRS and/or PRACH and/or PUSCH. If the triggered uplink burst is SRS, the triggered uplink burst is detected meaning the BS detects the allocated SRS sequence in the allocated time frequency resources. If triggered uplink burst is PRACH, the triggered uplink burst is detected meaning the BS detects the allocated PRACH sequence in the allocated time frequency resources. If triggered uplink burst is PUSCH, the triggered uplink burst is detected meaning the BS detects the PUSCH, in the allocated time frequency resources, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the trigger signal is addressed.
A second object of the present disclosure is a method, performed by a user equipment (UE) , for determining CWS for Category 4 LBT before the transmission of uplink burst (uplink burst 1) , based on the reference uplink burst which contains only SRS, the method comprises the step of determining the CWS which remains at the same value.
Advantageously, the reference uplink burst is most recently transmitted burst, also based on category 4 LBT, before uplink burst 1 and has the same LBT priority class as uplink burst 1.
A third object of the present disclosure is a base station (BS) , 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 fourth object of the present disclosure is a computer readable medium comprising program instructions for causing a base station to perform the steps of the method according to the first object.
A fifth object of the present disclosure is a user equipment, 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 second object.
A sixth 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 second 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 BS CWS determination based on reception status of the reference DL burst;
- Fig. 2 shows another illustration of BS CWS determination based on reception status of  the reference DL burst;
- Fig. 3 shows another illustration of BS CWS determination based on reception status of the reference DL burst;
- Fig. 4 shows another illustration of BS CWS determination based on reception status of the reference DL burst;
- Fig. 5 shows another illustration of BS CWS determination based on reception status of the reference DL burst;
- Fig. 6 shows another illustration of BS CWS determination based on reception status of the reference DL burst;
- Fig. 7 shows another illustration where CWS is not updated if Ref UL burst only contains SRS.
DETAILED DESCRIPTION
Example 1
As shown in Figure 1, if the reference DL burst only contains PDCCH triggering SRS, BS detects the allocated resource for SRS transmission with the allocated SRS sequence. If the BS detects SRS, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
Example 2
As shown in Figure 2, if the reference DL burst only contains PDCCH triggering SRS, BS detects the allocated resource for SRS transmission with the allocated SRS sequence. If the BS does not detect SRS, BS determines the reception of reference DL burst is failed thus sets the CWS to the next higher allowed value.
Example 3
As shown in Figure 3, if the reference DL burst only contains PDCCH triggering PRACH, BS detects the allocated resource for PRACH transmission with the allocated PRACH sequence. If the BS detects PRACH, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
Example 4
As shown in Figure 4, If the reference DL burst only contains PDCCH triggering PRACH, BS detects the allocated resource for PRACH transmission with the allocated PRACH sequence. If the BS does not detect PRACH, BS determines the reception of reference DL burst is successful thus sets the CWS to the next higher allowed value.
Example 5
As shown in Figure 5, If the reference DL burst only contains PDCCH triggering PUSCH, BS detects the allocated resource for PUSCH, in the allocated resource, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the triggering information is addressed. If the BS detects PUSCH, BS determines the reception of reference DL burst is successful thus sets the CWS to the min allowed value.
Example 6
As shown in Figure 6, If the reference DL burst only contains PDCCH triggering PUSCH, BS detects the allocated resource for PUSCH, in the allocated resource, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the triggering information is addressed. If the BS does not detect PUSCH, BS determines the reception of reference DL burst is successful thus sets the CWS to the next higher allowed value.
Example 7
As shown in Figure 7, If the reference UL burst only contains SRS, UE does not update the CWS for UL burst 1.
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 (14)

  1. A method, performed by a base-station (BS) , for determining CWS for Category 4 LBT before the transmission of downlink burst (downlink burst 1) , based on the reference downlink burst which contains only PDCCH triggering uplink burst, the method comprises the steps of:
    - determining the 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, BS sets the CWS to the minimum allowed value
    ο if the reception status of the reference burst is failed, BS sets the CWS to the next higher allowed value.
  2. A method for determining CWS according to claim 1, wherein the BS determines the reference burst reception status based on status of SRS triggering information reception, such that:
    - if uplink burst triggering information reception status is successful, BS determines the reference burst reception status is successful;
    - if uplink burst triggering information reception status is failed, BS determines the reference burst reception status is failed
  3. A method for determining CWS according to claim 2, wherein the BS determines the uplink burst triggering information reception status based on detection of the presence of triggered uplink burst in the allocated time frequency resources for triggered uplink burst transmission, such that:
    - if triggered uplink burst is detected, BS determines the uplink burst triggering information reception is successful;
    - if triggered uplink burst is not detected, BS determines the uplink burst triggering information reception is failed.
  4. A method for determining CWS according to claim 3, wherein the reference downlink burst is most recently transmitted burst, also based on category 4 LBT, before downlink burst 1 and has the same LBT priority class as downlink burst 1.
  5. A method for determining CWS according to claim 4, wherein the triggered uplink burst is SRS and/or PRACH and/or PUSCH.
  6. A method for determining CWS according to claim 5, wherein if the triggered uplink burst is SRS, the triggered uplink burst is detected meaning the BS detects the allocated SRS sequence in the allocated time frequency resources.
  7. A method for determining CWS according to claim 5, wherein if triggered uplink burst is PRACH, the triggered uplink burst is detected meaning the BS detects the allocated PRACH sequence in the allocated time frequency resources.
  8. A method for determining CWS according to claim 5, wherein if triggered uplink burst is PUSCH, the triggered uplink burst is detected meaning the BS detects the PUSCH, in the allocated time frequency resources, scrambled with the C-RNTI or CS-RNTI or MCS-RNTI of the UE to whom the trigger signal is addressed.
  9. A method, performed by a user equipment (UE) , for determining CWS for Category 4 LBT before the transmission of uplink burst (uplink burst 1) , based on the reference uplink burst which contains only SRS, the method comprises the step of determining the CWS which remains at the same value.
  10. A method for determining CWS according to claim 9, wherein the reference uplink burst is most recently transmitted burst, also based on category 4 LBT, before uplink burst 1 and has the same LBT priority class as uplink burst 1.
  11. A base station (BS) , 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 8.
  12. A computer readable medium comprising program instructions for causing a base station to perform the steps of the method according to any of claims 1 to 8.
  13. A user equipment (BS) , 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 claim 9 or 10.
  14. A computer readable medium comprising program instructions for causing a user equipment to perform the steps of the method according to claim 9 or 10.
PCT/CN2020/119580 2019-10-06 2020-09-30 A method of cws adaptation srs WO2021068847A1 (en)

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