Soft buffer management
Soft buffer management is disclosed in which a base station determines a first number of component carriers (CCs) monitored by a user equipment (UE) and determines a second number of CCs for partitioning a soft buffer for storing one or more unsuccessfully decoded data packets, wherein the second number is different than the first number. Various aspects provide for determination of the second number of CCs using clear channel assessment (CCA) clearance information with regard to unlicensed CCs used in the communication system.
1. A method of wireless communication, comprising:
determining a number of component carriers (CCs) configured for a user equipment (UE); and
identifying, within the number of CCs, a first set of CCs subject to clear channel assessment (CCA) operation; and
determining for partitioning a soft buffer based on at least in part on the number of CCs and the first set of CCs subject to CCA operation.
2. The method of claim 1 , wherein the first set of CCs subject to CCA operation are in an unlicensed spectrum.
3. The method of claim 1 , wherein the first set of CCs subject to CCA operations are in a shared licensed spectrum.
4. The method of claim 1 , wherein the determining for partitioning the soft buffer based on the first set of CCs subject to CCA operation includes scaling the first set of CCs subject to CCA operation by a scaling factor.
5. The method of claim 1 , further including determining a value for the first set of CCs subject to CCA operation for partitioning the soft buffer, where the value is less than the number of CCs in the first set of CCs subject to CCA operation.
6. The method of claim 1 , further including determining, within the first set of CCs subject to CCA operation, a number of CCs with CCA clearance for partitioning the soft buffer.
7. The method of claim 1 , wherein the number of CCs in the first set of CCs subject to CCA operation is equal to the number of CCs configured for the UE.
8. The method of claim 1 , further including determining a second set of CCs includes one or more CCs exempt from CCA operation, wherein the soft buffer is one of: separately or jointly partitioned for the first set of CCs and the second set of CCs.
9. The method of claim 8 , wherein joint partitioning of the soft buffer is prioritized for the one or more CCs in the second set of CCs.
10. The method of claim 8 , wherein a bit size of the soft buffer is separately determined for the first set of CCs and for the second set of CCs.
11. The method of claim 8 , further including:
selecting one of separately or jointly partitioning the soft buffer based on network operations.
12. The method of claim 11 , further including:
selecting jointly partitioning the soft buffer when the network operations include carrier aggregation; and
selecting separately partitioning the soft buffer when the network operation includes two or more base stations having non-ideal backhaul communication, wherein the two or more base stations are associated with one or more of the number of CCs configured for the UE.
13. The method of claim 1 , wherein partitioning the soft buffer is further based on at least one of a RRC signaling message, whether the UE operates using multiple input, multiple output (MIMO) signaling, a maximum number of downlink hybrid automatic repeat request (HARQ) processes available to the UE based on an uplink/downlink configuration of a base station, or a maximum limit of HARQ processes allowed in determination of a size.
14. The method of claim 13 , wherein the maximum limit of HARQ processes, M limit , includes a first M limit selected for the first set of CCs and a second M limit selected for the second set of CCs.
15. An apparatus configured for wireless communication, the apparatus comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to determine a number of component carriers (CCs) configured for a user equipment (UE); and
to identify, within the number of CCs, a first set of CCs subject to clear channel assessment (CCA) operation; and
to determine for partitioning a soft buffer based on at least in part on the number of CCs and the first set of CCs subject to CCA operation.
16. The apparatus of claim 15 , wherein the first set of CCs subject to CCA operation are in an unlicensed spectrum.
17. The apparatus of claim 15 , wherein the first set of CCs subject to CCA operation are in a shared licensed spectrum.
18. The apparatus of claim 15 , wherein the configuration of the at least one processor to determine for partitioning the soft buffer based on the first set of CCs subject to CCA operation includes configuration of the at least one processor to scale the first set of CCs subject to CCA operation by a scaling factor.
19. The apparatus of claim 15 , further including configuration of the at least one processor to determine a value for the first set of CCs subject to CCA operation for partitioning the soft buffer, where the value is less than the number of CCs in the first set of CCs subject to CCA operation.
20. The apparatus of claim 15 , further including configuration of the at least one processor to determine, within the first set of CCs subject to CCA operation, a number of CCs with CCA clearance for partitioning the soft buffer.
21. The apparatus of claim 15 , wherein the number of CCs in the first set of CCs subject to CCA operation is equal to the number of CCs configured for the UE.
22. The apparatus of claim 15 , further including configuration of the at least one processor to determine a second set of CCs includes one or more CCs exempt from CCA operation, wherein the soft buffer is one of: separately or jointly partitioned for the first set of CCs and the second set of CCs.
23. The apparatus of claim 21 , wherein joint partitioning of the soft buffer is prioritized for the one or more CCs in the second set of CCs.
24. The apparatus of claim 21 , wherein a bit size of the soft buffer is separately determined for the first set of CCs and for the second set of CCs.
25. The apparatus of claim 21 , further including:
configuration of the at least one processor to select one of separately or jointly partitioning the soft buffer based on network operations.
26. The apparatus of claim 25 , further including:
configuration of the at least one processor to select jointly partitioning the soft buffer when the network operations include carrier aggregation; and
configuration of the at least one processor to select separately partitioning the soft buffer when the network operation includes two or more base stations having non-ideal backhaul communication, wherein the two or more base stations are associated with one or more of the number of CCs configured for the UE.
27. The apparatus of claim 15 , wherein partitioning the soft buffer is further based on at least one of a RRC signaling message, whether the UE operates using multiple input, multiple output (MIMO) signaling, a maximum number of downlink hybrid automatic repeat request (HARQ) processes available to the UE based on an uplink/downlink configuration of a base station, or a maximum limit of HARQ processes allowed in determination of a size.
28. The apparatus of claim 27 , wherein the maximum limit of HARQ processes, M limit , includes a first M limit selected for the first set of CCs and a second M limit selected for the second set of CCs.
29. A non-transitory computer-readable medium having program code recorded thereon, that, when executed by one or more computer processors, causes the one or more computer processors to:
determine a number of component carriers (CCs) configured for a user equipment (UE); and
identify, within the number of CCs, a first set of component carriers subject to clear channel assessment (CCA) operation; and
determine for partitioning a soft buffer based on at least in part on the number of CCs and the first set of CCs subject to CCA operation.
30. The non-transitory computer-readable medium of claim 29 , wherein the first set of CCs subject to CCA operation are in one of: an unlicensed spectrum, or a shared licensed spectrum.