Transmission of buffer status reports on multiple component carriers
The present disclosure generally relates to a methods, apparatus, and computer readable medium for implementing the methods for transmitting multi-bit SR (SRs) from a user equipment (UE). The UE receive from a base station a radio resource control (RRC) message from the base station. The RRC message may indicate that uplink component carriers (CCs) of the UE are to be assigned to a plurality of uplink CC groups. Upon receipt of the RRC, the UE may assign the uplink CCs to the plurality of uplink CC groups. A multi-bit SR may be generated for each group of the plurality of uplink CC groups. The UE may transmit the multi-bit SR generated for each group of the plurality of uplink CC groups to the base station. multi-bit SR transmission across different CCs may reduce latency in uplink grant and improve data transmission time.
1. A method of transmitting multi-bit scheduling requests (SRs) from a user equipment (UE); comprising:
receiving, at the UE, a radio resource control (RRC) message from a first base station, wherein the RRC message indicates that uplink component carriers (CCs) of the UE are to be assigned to a plurality of uplink CC groups, wherein the plurality of uplink CC groups includes a first uplink CC group and a second uplink CC group;
assigning the uplink CCs to the plurality of uplink CC groups;
generating, at the UE, a plurality of multi-bit SRs including a multi-bit SR for each group of the plurality of uplink CC groups, including a first multi-bit SR for the first uplink CC group and a second multi-bit SR for the second uplink CC group, wherein a first number of bits of the first multi-bit SR is different from a second number of bits of the second multi-bit SR;
mapping each logical channel of a plurality of logical channels at the UE to at least one uplink CC of the plurality of uplink CCs; and
transmitting, from the UE, at least one of the plurality of multi-bit SRs generated for a group of the plurality of uplink CC groups.
2. The method of claim 1 , wherein the mapping is updated in a semi-static manner or a dynamic manner.
3. The method of claim 2 , wherein the mapping is updated in the semi-static manner via a second RRC message.
4. The method of claim 1 , further comprising:
dynamically updating, at the UE, a number of bits of the multi-bit SR based on one or more of an assigned physical uplink control channel (PUCCH), a PUCCH format, a PUCCH assignment size, or types of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or sizes of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or any combination thereof.
5. The method of claim 1 , wherein a size of the multi-bit SR is represented by a function
X =ceil(log2( K+ 1))
wherein K is a number of physical uplink control channel (PUCCH) resources and X is a number of SR bits.
6. The method of claim 5 , wherein the K PUCCH resources are ordered in increasing size of corresponding SR resources, and wherein an index of an ordered PUCCH resource ID is obtained from X bits when SR is triggered.
7. The method of claim 1 , wherein the multi-bit SR includes a buffer status report (BSR).
8. A user equipment (UE); comprising:
a memory having instructions;
a transceiver; and
one or more processors communicatively coupled with the memory and the transceiver, the one or more processors are configured to execute the instructions to:
receive, via the transceiver, at the UE, a radio resource control (RRC) message from a first base station, wherein the RRC message indicates that uplink component carriers (CCs) of the UE are to be assigned to a plurality of uplink CC groups, wherein the plurality of uplink CC groups includes a first uplink CC group and a second uplink CC group;
assign the uplink CCs to the plurality of uplink CC groups;
generate, at the UE, a plurality of multi-bit SRs including a multi-bit SR for each group of the plurality of uplink CC groups, including a first multi-bit SR for the first uplink CC group and a second multi-bit SR for the second uplink CC group, wherein a first number of bits of the first multi-bit SR is different from a second number of bits of the second multi-bit SR;
map each logical channel of a plurality of logical channels at the UE to at least one uplink CC of the plurality of uplink CCs; and
transmit, via the transceiver, from the UE, at least one of the plurality of multi-bit SRs generated for a group of the plurality of uplink CC groups.
9. The UE of claim 8 , wherein the mapping is updated in a semi-static manner or a dynamic manner.
10. The UE of claim 9 , wherein the mapping is updated in the semi-static manner via a second RRC message.
11. The UE of claim 8 , wherein the one or more processors are further configured to:
dynamically update, at the UE, a number of bits of the multi-bit SR based on one or more of an assigned physical uplink control channel (PUCCH), a PUCCH format, a PUCCH assignment size, or types of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or sizes of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or any combination thereof.
12. The UE of claim 8 , wherein a size of the multi-bit SR is represented by a function
X =ceil(log2( K+ 1))
wherein K is a number of physical uplink control channel (PUCCH) resources and X is a number of SR bits.
13. The UE of claim 12 , wherein the K PUCCH resources are ordered in increasing size of corresponding SR resources, and wherein an index of an ordered PUCCH resource ID is obtained from X bits when SR is triggered.
14. The UE of claim 8 , wherein the multi-bit SR includes a buffer status report (BSR).
15. A user equipment (UE); comprising:
means for receiving, at the UE, a radio resource control (RRC) message from a first base station, wherein the RRC message indicates that uplink component carriers (CCs) of the UE are to be assigned to a plurality of uplink CC groups, wherein the plurality of uplink CC groups includes a first uplink CC group and a second uplink CC group;
means for assigning the uplink CCs to the plurality of uplink CC groups;
means for generating, at the UE, a plurality of multi-bit SRs including a multi-bit SR for each group of the plurality of uplink CC groups, including a first multi-bit SR for the first uplink CC group and a second multi-bit SR for the second uplink CC group, wherein a first number of bits of the first multi-bit SR is different from a second number of bits of the second multi-bit SR;
means for mapping each logical channel of a plurality of logical channels at the UE to at least one uplink CC of the plurality of uplink CCs; and
means for transmitting, from the UE, at least one of the plurality of multi-bit SRs generated for a group of the plurality of uplink CC groups.
16. The UE of claim 15 , wherein the mapping is updated in a semi-static manner or a dynamic manner.
17. The UE of claim 16 , wherein the mapping is updated in the semi-static manner via a second RRC message.
18. The UE of claim 15 , further comprising:
means for dynamically updating, at the UE, a number of bits of the multi-bit SR based on one or more of an assigned physical uplink control channel (PUCCH), a PUCCH format, a PUCCH assignment size, or types of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or sizes of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or any combination thereof.
19. The UE of claim 15 , wherein a size of the multi-bit SR is represented by a function
X =ceil(log2( K+ 1))
wherein K is a number of physical uplink control channel (PUCCH) resources and X is a number of SR bits.
20. The UE of claim 19 , wherein the K PUCCH resources are ordered in increasing size of corresponding SR resources, and wherein an index of an ordered PUCCH resource ID is obtained from X bits when SR is triggered.
21. The UE of claim 15 , wherein the multi-bit SR includes a buffer status report (BSR).
22. A non-transitory computer readable medium including instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
receive, at the UE, a radio resource control (RRC) message from a first base station, wherein the RRC message indicates that uplink component carriers (CCs) of the UE are to be assigned to a plurality of uplink CC groups, wherein the plurality of uplink CC groups includes a first uplink CC group and a second uplink CC group;
assign the uplink CCs to the plurality of uplink CC groups;
generate, at the UE, a plurality of multi-bit SRs including a multi-bit SR for each group of the plurality of uplink CC groups, including a first multi-bit SR for the first uplink CC group and a second multi-bit SR for the second uplink CC group, wherein a first number of bits of the first multi-bit SR is different from a second number of bits of the second multi-bit SR;
map each logical channel of a plurality of logical channels at the UE to at least one uplink CC of the plurality of uplink CCs; and
transmit, from the UE, at least one of the plurality of multi-bit SRs generated for a group of the plurality of uplink CC groups.
23. The non-transitory computer readable medium of claim 22 , wherein the mapping is updated in a semi-static manner or a dynamic manner.
24. The non-transitory computer readable medium of claim 23 , wherein the mapping is updated in the semi-static manner Nia a second RRC message.
25. The non-transitory computer readable medium of claim 22 , further comprises instructions that cause the one or more processors to:
dynamically update, at the UE, a number of bits of the multi-bit SR based on one or more of an assigned physical uplink control channel (PUCCH), a PUCCH format, a PUCCH assignment size, or types of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or sizes of other uplink control information (UCI) payloads multiplexed together with the multi-bit SR on PUCCH, or any combination thereof.
26. The non-transitory computer readable medium of claim 22 , wherein a size of the multi-bit SR is represented by a function
X =ceil(log2( K+ 1))
wherein K is a number of physical uplink control channel (PUCCH) resources and X is a number of SR bits.
27. The non-transitory computer readable medium of claim 26 , wherein the K PUCCH resources are ordered in increasing size of corresponding SR resources, and wherein an index of an ordered PUCCH resource ID is obtained from X bits when SR is triggered.
28. The non-transitory computer readable medium of claim 22 , wherein the multi-bit SR includes a buffer status report (BSR).