PERIODIC CHANNEL STATE INFORMATION REPORTING FOR ENHANCED CARRIER AGGREGATION

• US 20170006491A1
• Filed: 06/23/2016
• Published: 01/05/2017
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chen, Wanshi, Gaal, Peter
• Granted Patent: US 10,104,568 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may detect the size of a payload for reporting hybrid automatic repeat request (HARQ) feedback for transmissions on a set of component carriers (CCs) and may determine whether a scheduling request (SR) and/or a periodic channel state information (P-CSI) report is present. The UE may compare a size of an uplink control message, which may include a HARQ payload size and a payload for the SR or P-CSI report, with a threshold to select an uplink control format. The selected uplink control format maybe associated with a large number of CCs if the uplink control message has a payload size above a threshold. The UE may also use a configuration for transmitting two or more P-CSI reports during a subframe for CCs of a carrier aggregation (CA) configuration. P-CSI reports due for transmission during a given subframe.

Claims

1. A method of wireless communication, comprising:

detecting a size of a hybrid automatic repeat request (HARQ) payload for reporting, in a subframe, HARQ feedback associated with transmissions on a plurality of component carriers (CCs);

determining that at least one of a scheduling request (SR), a periodic channel state information (P-CSI) report, or a combination thereof is to be included in the subframe;

selecting a physical uplink control channel (PUCCH) format from a set of PUCCH formats based at least in part on a comparison of a size of an uplink control message with a threshold, wherein the uplink control message comprises the HARQ payload and a payload for at least one of the SR or the P-CSI report; and

transmitting the uplink control message in the subframe using the selected PUCCH format.

2. The method of claim 1, wherein the set of PUCCH formats comprises a first set of PUCCH formats associated with reporting HARQ feedback for one CC, a second set of PUCCH formats associated with reporting HARQ feedback for up to five CCs, or a third set of PUCCH formats associated with reporting HARQ feedback for more than five CCs.

3. The method of claim 1, wherein when the size of the uplink control message is greater than the threshold, selecting the PUCCH format comprises selecting a PUCCH format having a greater capacity than at least one other PUCCH format from the set of PUCCH formats.

4. The method of claim 3, wherein the threshold has a size of 22 bits.

5. The method of claim 1, further comprising:

multiplexing the HARQ payload with P-CSI reports for two or more CCs configured for the UE, wherein determining that at least one of an SR or a P-CSI report is to be included in the subframe comprises identifying the P-CSI reports for the two or more CCs configured for the UE.

6. The method of claim 1, wherein the SR is determined to be present and the uplink control message comprises the HARQ payload and a payload for the SR.

7. The method of claim 1, wherein the SR and the P-CSI report are determined to be present and the uplink control message comprises the HARQ payload, a payload for the SR, and a payload for the P-CSI report.

8. The method of claim 1, wherein the P-CSI report comprises a report from at least one P-CSI process from a plurality of P-CSI processes for a CC configured for the UE, a report from a P-CSI process for at least one P-CSI subframe set from a plurality of P-CSI subframe sets for a CC configured for the UE, or a combination thereof.

9. The method of claim 1, wherein determining that at least one of the SR or the P-CSI report is to be included in the subframe comprises:

determining to report a subset of P-CSI reports from a set of P-CSI reports.

10. The method of claim 9, wherein determining to report a subset of P-CSI reports from a set of P-CSI reports comprises:

prioritizing P-CSI reports based on P-CSI report types, the prioritizing performed within a CC configured for the UE, or across CCs configured for the UE, or a combination thereof.

11. The method of claim 9, wherein determining to report a subset of P-CSI reports from a set of P-CSI reports comprises:

prioritizing based on P-CSI report types, followed by prioritizing based on a CSI process identification, followed by prioritizing based on a CC index, followed by prioritizing based on a subframe set index.

12. The method of claim 1, further comprising:

receiving signaling indicative of the size of the HARQ payload from a network node.

13. The method of claim 1, further comprising:

receiving signaling indicative of whether to consider a presence of the at least one of the SR or the P-CSI report in the selection of the PUCCH format.

14. The method of claim 1, wherein the set of PUCCH formats comprises a first PUCCH format associated with P-CSI reporting for one CC and a second PUCCH associated with P-CSI reporting for two or more CCs.

15. The method of claim 1, wherein the uplink control message is associated with a cell group among a plurality of cell groups.

16. A method of wireless communication, comprising:

receiving a configuration supporting transmission of a plurality of periodic channel state information (P-CSI) reports during a same transmission time interval (TTI), wherein the P-CSI reports are associated with two or more of P-CSI reports for a plurality of subframe sets of a channel state information (CSI) process, P-CSI reports for a plurality of CSI processes of a component carrier (CC), or P-CSI reports for a plurality of CCs of a carrier aggregation (CA) configuration;

determining that two or more P-CSI reports are due for transmission during the TTI; and

transmitting at least one of the P-CSI reports during the TTI according to a prioritization rule.

17. The method of claim 16, wherein the prioritization rule is based at least in part on a payload capacity of a physical uplink control channel (PUCCH) format or payload sizes of the two or more P-CSI reports.

18. The method of claim 16, wherein the configuration supporting transmission of the plurality of P-CSI reports comprises at least one of a coordinated multipoint (CoMP) configuration, a CA configuration with one or more PUCCH groups, a dual-connectivity configuration, or an interference mitigation and traffic adaptation (IMTA) configuration.

19. The method of claim 16, wherein the prioritization rule comprises prioritizing by a CSI type, followed by a CSI process identification (ID), followed by a CC index, followed by a subframe set index.

20. The method of claim 16, wherein the CA configuration comprises a configuration of more than five CCs.

21. An mobile device, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the mobile device to;

detect a size of a hybrid automatic repeat request (HARQ) payload for reporting, in a subframe, HARQ feedback associated with transmissions on a plurality of component carriers (CCs);

determine that at least one of a scheduling request (SR), a periodic channel state information (P-CSI) report, or a combination thereof is to be included in the subframe;

select a physical uplink control channel (PUCCH) format from a set of PUCCH formats based at least in part on a comparison of a size of an uplink control message with a threshold, wherein the uplink control message comprises the HARQ payload and a payload for at least one of the SR or the P-CSI report; and

transmit the uplink control message in the subframe using the selected PUCCH format.

22. The mobile device of claim 21, wherein when the size of the uplink control message is greater than the threshold, selecting the PUCCH format comprises selecting a PUCCH format having a greater capacity than at least one other PUCCH format from the set of PUCCH formats.

23. The mobile device of claim 21, wherein the instructions are operable to cause the mobile device to:

multiplex the HARQ payload with P-CSI reports for two or more CCs configured for the UE, wherein determining that at least one of an SR or a P-CSI report is to be included in the subframe comprises identifying the P-CSI reports for the two or more CCs configured for the UE.

24. The mobile device of claim 21, wherein the instructions are operable to cause the mobile device to:

receive signaling indicative of the size of the HARQ payload from a network node.

25. The mobile device of claim 21, wherein the instructions are operable to cause the mobile device to:

receive signaling indicative of whether to consider a presence of the at least one of the SR or the P-CSI report in the selection of the PUCCH format.

26. The mobile device of claim 21, wherein the uplink control message is associated with a cell group among a plurality of cell groups.

27. An mobile device for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the mobile device to;

receive a configuration supporting transmission of a plurality of periodic channel state information (P-CSI) reports during a same transmission time interval (TTI), wherein the P-CSI reports are associated with two or more of P-CSI reports for a plurality of subframe sets of a channel state information (CSI) process, P-CSI reports for a plurality of CSI processes of a component carrier (CC), or P-CSI reports for a plurality of CCs of a carrier aggregation (CA) configuration;

determine that two or more P-CSI reports are due for transmission during the TTI; and

transmit at least one of the P-CSI reports during the TTI according to a prioritization rule.

28. The mobile device of claim 27, wherein the prioritization rule is performed based at least in part on a payload capacity of a physical uplink control channel (PUCCH) format or payload sizes of the two or more P-CSI reports.

29. The mobile device of claim 27, wherein the configuration supporting transmission of the plurality of P-CSI reports comprises at least one of a coordinated multipoint (CoMP) configuration, a CA configuration with one or more PUCCH groups, a dual-connectivity configuration, or an interference mitigation and traffic adaptation (IMTA) configuration.

30. The mobile device of claim 27, wherein the prioritization rule comprises prioritizing a CSI type, followed by a CSI process identification (ID), followed by a CC index, followed by a subframe set index.