CONTENTION-BASED PHYSICAL UPLINK SHARED CHANNEL

• US 20170181155A1
• Filed: 11/22/2016
• Published: 06/22/2017
• Est. Priority Date: 12/16/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ozturk, Ozcan, Damnjanovic, Aleksandar, Chen, Wanshi, Montojo, Juan
• Granted Patent: US 11,202,282 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may identify uplink (UL) control information (UCI) to transmit during a subframe. The UE may then select a UL channel on which to transmit the UCI based on whether a shared data and control UL channel employs contention-based scheduling. For example, multiple UEs could contend for access to the same semi-persistently scheduled (SPS) physical UL shared channel (PUSCH). Each UE may utilize a different demodulation reference (DMRS) signal cyclic shift to identify their transmissions. In some cases, some UCI, such as channel state information (CSI), may be transmitted on a contention-based PUSCH, while other UCI, such as acknowledgement information, may be transmitted on a physical uplink control channel (PUCCH). In some cases, the channel selection may be based on a configuration received from a base station.

Claims

1. A method of wireless communication comprising:

identifying uplink (UL) control information (UCI) to transmit during a subframe;

identifying a scheduling type for a UL data channel during the subframe; and

determining whether to transmit the UCI on the UL data channel based at least in part on the scheduling type.

2. The method of claim 1, further comprising:

receiving a grant for the UL data channel, wherein the scheduling type is identified based at least in part on the grant.

3. The method of claim 1, further comprising:

receiving at least one of a configuration or an activation message for a semi-persistent scheduling (SPS) of the UL channel, wherein the scheduling type is identified based at least in part on the SPS.

4. The method of claim 1, wherein the scheduling type comprises of at least a contention-based scheduling type and a non-contention based scheduling type.

5. The method of claim 3, further comprising:

determining that physical hybrid automatic repeat request (HARD) indicator channel (PHICH) monitoring is disabled for the SPS; and

refraining from monitoring a PHICH based at least in part on the determination that PHICH monitoring is disabled.

6. The method of claim 5, further comprising:

receiving a PHICH monitoring indication in a radio resource control (RRC) configuration message, wherein the determination that PHICH monitoring is disabled is based at least in part on the PHICH monitoring indication.

7. The method of claim 5, wherein the determination that PHICH monitoring is disabled is based at least in part on whether a demodulation reference signal (DMRS) cyclic shift is configured.

8. The method of claim 3, further comprising:

identifying a set of PHICH resources for the SPS based at least in part on a DMRS cyclic shift; and

monitoring the set of PHICH resources.

9. The method of claim 3, further comprising:

identifying a periodicity of the SPS; and

determining whether transmission time interval (TTI) bundling is supported based at least in part on the periodicity of the SPS.

10. The method of claim 3, wherein the SPS of the UL data channel is configured for a primary cell (PCell) of a physical uplink control channel (PUCCH) group.

11. The method of claim 3, further comprising:

identifying a physical uplink shared channel (PUSCH) selection parameter for a dual connectivity configuration; and

selecting a cell of the dual connectivity configuration based at least in part on the PUSCH selection parameter, wherein the UL data channel is associated with the selected cell.

12. The method of claim 1, further comprising:

determining whether to transmit the UCI on the UL data channel based at least in part on an information type of the UCI.

13. The method of claim 1, further comprising:

receiving a radio resource control (RRC) configuration message indicating the scheduling type.

14. The method of claim 1, further comprising:

receiving a configuration of a DMRS cyclic shift for the scheduling type.

15. The method of claim 1, further comprising:

identifying one or more downlink (DL) control information (DCI) search parameters based at least in part on the scheduling type; and

monitoring a UE-specific search space based at least in part on the one or more DCI search parameters.

16. The method of claim 1, further comprising:

performing a contention procedure for the UL data channel based at least in part on the scheduling type; and

transmitting the UCI on the UL data channel based at least in part on the contention procedure and on the determination whether to transmit the UCI on the UL channel.

17. The method of claim 1, further comprising:

refraining from transmitting the UCI on the UL data channel based at least in part on the scheduling type.

18. A method of wireless communication comprising:

transmitting a control message to a user equipment (UE) that indicates an uplink (UL) control information (UCI) handling configuration;

identifying a scheduling type for a UL data channel during a subframe; and

receiving UCI from the UE, wherein the UCI is transmitted based at least in part on the UCI handling configuration and the scheduling type.

19. The method of claim 18, further comprising at least one of:

transmitting a grant for the UL channel, wherein the scheduling type is based at least in part on the grant;

transmitting an activation message for a semi-persistent scheduling (SPS) of the UL channel, wherein the scheduling type is based at least in part on the SPS;

or

transmitting a radio resource control (RRC) configuration message indicating that the scheduling type includes a contention-based scheduling type.

20. The method of claim 18, further comprising:

transmitting an additional control message indicating that physical hybrid automatic repeat request (HARD) indicator channel (PHICH) monitoring is disabled for the SPS.

21. The method of claim 18, further comprising:

transmitting a configuration message indicating a demodulation reference signal (DMRS) cyclic shift for the scheduling type.

22. An apparatus 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 apparatus to;

identify uplink (UL) control information (UCI) to transmit during a subframe;

identify a scheduling type for a UL data channel during the subframe; and

determine whether to transmit the UCI on the UL data channel based at least in part on the scheduling type.

23. The apparatus of claim 22, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

receive a grant for the UL channel, wherein the scheduling type is identified based at least in part on the grant.

24. The apparatus of claim 22, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

receive at least one of a configuration or an activation message for a semi-persistent scheduling (SPS) of the UL channel, wherein the scheduling type is identified based at least in part on the SPS.

25. The apparatus of claim 22, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

determine whether to transmit the UCI on the UL data channel based at least in part on an information type of the UCI.

26. The apparatus of claim 22, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

receive a radio resource control (RRC) configuration message indicating the scheduling type.

27. An apparatus 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 apparatus to;

transmit a control message to a user equipment (UE) that indicates a UL control information (UCI) handling configuration;

identify a scheduling type for a UL data channel during a subframe, the scheduling type being a contention-based scheduling type or a non-contention-based scheduling type; and

receive UCI from the UE, wherein the UCI is transmitted based at least in part on the UCI handling configuration and the scheduling type.

28. The apparatus of claim 27, wherein the instructions are operable, when executed by the processor, to cause the apparatus to transmit at least one of:

a grant for the UL channel, wherein the scheduling type is based at least in part on the grant;

an activation message for a semi-persistent scheduling (SPS) of the UL channel, wherein the scheduling type is based at least in part on the SPS;

or

a radio resource control (RRC) configuration message indicating that the scheduling type includes the contention-based scheduling type.

29. The apparatus of claim 27, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

transmit an additional control message indicating that physical hybrid automatic repeat request (HARD) indicator channel (PHICH) monitoring is disabled for the SPS.

30. The apparatus of claim 27, wherein the instructions are operable, when executed by the processor, to cause the apparatus to:

transmit a configuration message indicating a demodulation reference signal (DMRS) cyclic shift for the scheduling type.