Adapting UE serving cell procedures based on DL CCA operational information

Patent metadata

Field	Value
Publication number	US-12048002-B2
Application number	US-202017599314-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 28, 2019
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A method by a wireless device includes receiving a message from a radio access network, RAN, node serving the wireless device including an indication of failure of a clear channel assessment, CCA, procedure by the RAN node on a wireless channel, and adapting a serving cell procedure in response to the message. A method by a RAN node, includes performing a CCA on a downlink channel, determining based on the CCA whether or not the downlink channel is occupied, and transmitting a message to a wireless device including an indication of a CCA failure based on a determination that the downlink channel was occupied. Related wireless devices and network nodes are disclosed.

First claim

The invention claimed is:

1. A method performed by a wireless device, the method comprising:
receiving a message from a radio access network, RAN, node serving the wireless device, the message comprising an indication of failure of a clear channel assessment, CCA, procedure by the RAN node on a wireless channel wherein the indication of failure of the CCA procedure comprises a bitmap indicating locations of resources associated with CCA failure and locations of resources associated with CCA success; and
adapting a serving cell procedure in response to the message wherein adapting the serving cell procedure comprises selectively filtering measurements based on the bitmap.

2. The method of claim 1 , further comprising establishing a wireless connection with the RAN node using a wireless channel before receiving the message.

3. The method of claim 1 , wherein adapting the serving cell procedure comprises adapting monitoring and/or measurements on the wireless channel.

4. The method of claim 1 , wherein adapting the serving cell procedure comprises comparing the bitmap to a list of samples obtained over a measurement time interval and selectively excluding samples which were obtained based on contents of the bitmap.

5. The method of claim 1 , wherein adapting the serving cell procedure comprises adapting a radio link failure, RLF, declaration process, wherein adapting the RLF declaration process comprises performing at least one of:
restarting or extending an RLF timer;
suspending the RLF timer;
restarting or extending an out-of-sync and/or in-sync evaluation period;
resetting an out-of-sync and/or in-sync counter;
changing a value of the out-of-sync counter to compensate for out-of-sync events that result from CCA failure at the RAN node;
suspending the out-of-sync counter; and/or
adapting a threshold for when out-of-sync events trigger a start of the RLF timer.

6. The method of claim 1 , wherein adapting the serving cell procedure comprises adapting a beam management procedure.

7. The method of claim 6 , wherein adapting the beam management procedure comprises performing at least one of:
extending a beam failure detection evaluation time with respect to a reference signal evaluation time;
restarting a beam failure detection process;
restarting a candidate beam detection process;
extending the candidate beam detection process;
adapting a threshold for triggering a beam failure detection or declaration;
adapting a threshold for triggering start of a timer for beam failure detection or declaration; and/or
postponing the candidate beam detection process.

8. The method of claim 1 , further comprising:
modifying a cell measurement procedure based on the indication of the CCA failure received from the RAN node.

9. The method of claim 8 , wherein modifying a cell measurement comprises performing at least one of:
modifying radio link monitoring, beam management, cell change or power control, stopping or preventing a measurement based on the indication of the CCA failure indicating a plurality of failures, or stopping future cell measurements for a predetermined period of time.

10. The method of claim 9 , further comprising resuming cell measurement from a last sample prior to stopping cell measurements.

11. The method of claim 1 , wherein the indication of the CCA failure is received via at least one of: a Physical Broadcast Channel, PBCH, one or more payload bits outside a master information block, MIB, of a PBCH, a System Information Block, SIB, a single bit, and/or more than one bit.

12. The method of claim 1 , wherein the indication of CCA failure comprises one or more of beam related information, information related to a direction of a beam, a number of CCA failures that have occurred, and/or a ratio of successful to failed CCA attempts.

13. The method of claim 1 , wherein the wireless channel comprises one or more of unlicensed spectrum, shared spectrum, spectrum subject to a CCA procedure, spectrum subject to a listen before talk, LBT, procedure and/or spectrum for contention based operation.

14. A wireless device, comprising:
processing circuitry; and
memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the wireless device to perform operations comprising:
receiving a message from a radio access network, RAN, node serving the wireless device, the message comprising an indication of a failure of a clear channel assessment, CCA, procedure by the RAN node on a wireless channel wherein the indication of failure of the CCA procedure comprises a bitmap indicating locations of resources associated with CCA failure and locations of resources associated with CCA success; and
adapting a serving cell procedure in response to the message wherein adapting the serving cell procedure comprises selectively filtering measurements based on the bitmap.

15. The wireless device of claim 14 , wherein the memory includes instructions that when executed by the processing circuitry further causes the wireless device to establish a wireless connection with the RAN node using a wireless channel before receiving the message.

16. The wireless device of claim 14 , wherein adapting the serving cell procedure comprises adapting monitoring and/or measurements on the wireless channel.

17. The wireless device of claim 14 , wherein adapting the serving cell procedure comprises comparing the bitmap to a list of samples obtained over a measurement time interval and selectively excluding samples which were obtained based on contents of the bitmap.

18. The wireless device of claim 14 , wherein adapting the serving cell procedure comprises adapting a radio link failure, RLF, declaration process, wherein adapting the RLF declaration process comprises performing at least one of:
restarting or extending an RLF timer;
suspending the RLF timer;
restarting or extending an out-of-sync and/or in-sync evaluation period;
resetting an out-of-sync and/or in-sync counter;
changing a value of the out-of-sync counter to compensate for out-of-sync events that result from CCA failure at the RAN node;
suspending the out-of-sync counter; and/or
adapting a threshold for when out-of-sync events trigger a start of the RLF timer.

19. The wireless device of claim 14 , wherein adapting the serving cell procedure comprises adapting a beam management procedure.

20. The wireless device of claim 19 , wherein adapting the beam management procedure comprises performing at least one of:
extending a beam failure detection evaluation time with respect to a reference signal evaluation time;
restarting a beam failure detection process;
restarting a candidate beam detection process;
extending the candidate beam detection process;
adapting a threshold for triggering a beam failure detection or declaration;
adapting a threshold for triggering start of a timer for beam failure detection or declaration; and/or
postponing the candidate beam detection process.

21. The wireless device of claim 14 , wherein the memory includes instructions that when executed by the processing circuitry further causes the wireless device to perform operations comprising:
modifying a cell measurement procedure based on the indication of the CCA failure received from the RAN node.

22. The wireless device of claim 21 , wherein modifying a cell measurement comprises performing at least one of:
modifying radio link monitoring, beam management,

Assignees

• Ericsson Telefon Ab L M

Inventors

• Thangarasa Santhan
• Kazmi Muhammad
• Rune Johan

Classifications

• H04W24/04

  Arrangements for maintaining operational condition · CPC title

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W74/006 Primary

  in the downlink, i.e. towards the terminal · CPC title

• H04B17/382

  for resource allocation, admission control or handover · CPC title

• H04B17/17

  Detection of non-compliance or faulty performance, e.g. response deviations (H04B17/18 takes precedence) · CPC title