Sounding mechanism and configuration under carrier aggregation

• US 9,270,433 B2
• Filed: 08/04/2014
• Issued: 02/23/2016
• Est. Priority Date: 06/18/2010
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Chen, Yih-Shen, Lin, Chih-Yuan
• Primary Examiner(s): PHUNKULH, BOB A
• Application Number:
  US14/450,430
• Publication Number:
  US 20140341167A1
• Time in Patent Office: 568 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method of multi-set RRC signaling for ap-SRS configuration is provided to enhance ap-SRS flexibility. An eNB transmits a plurality of sets of UE-specific SRS parameters to a UE via upper layer messaging in a multi-carrier wireless communication system. The eNB also determines triggering information of a selected set of UE-specific SRS parameters and an indicated carrier for the UE. The eNB then transmits an uplink or downlink grant over a primary carrier, the grant comprises triggering information for the UE to send an ap-SRS over the indicated carrier using the selected set of UE-specific SRS parameters. In one embodiment of joint signaling, the plurality of sets of UE-specific SRS parameters are signaled together in a single RRC transmission. In another embodiment of separate signaling, each set of UE-specific SRS parameters is signaled independently.

Claims

1. A method comprising:

transmitting a plurality of sets of UE-specific sounding reference signal (SRS) parameters associated with aperiodic SRS (ap-SRS) transmission over different carriers to a user equipment via upper layer messaging in a multi-carrier wireless communication system, wherein the plurality of sets of UE-specific SRS parameters are jointly signaled together via a single radio resource control (RRC) message;

determining a selected set of UE-specific SRS parameters and an indicated carrier for the UE; and

transmitting a grant to the UE over a primary carrier, wherein the grant comprises information for the UE to send an aperiodic SRS (ap-SRS) over the indicated carrier using the selected set of UE-specific SRS parameters, and wherein the grant further comprises a carrier indicator field indicating the indicated carrier.

2. The method of claim 1, wherein each set of UE-specific SRS parameters comprises an SRS bandwidth, a frequency domain position, a transmission comb, a cyclic shift, and a number of antenna ports.

3. The method of claim 1, wherein the plurality of sets of UE-specific SRS parameters are configured as part of physical parameters of the RRC message, and wherein the RRC message configures ap-SRS for multiple secondary carriers.

4. The method of claim 1, wherein the grant is transmitted in a physical downlink control channel (PDCCH) that supports multiple downlink control information (DCI) formats, and wherein each DCI format corresponds to one or more sets of predefined UE-specific SRS parameters configured via upper layer messaging.

5. The method of claim 1, wherein the SRS parameters are transmitted via direct signaling or delta signaling.

6. A base station, comprising:

an information encoding module that encodes a plurality of sets of UE-specific SRS parameters associated with aperiodic SRS (ap-SRS) transmission over different carriers for a user equipment (UE); and

a transmitter that transmits the plurality of sets of UE-specific SRS parameters via upper layer messaging over a primary carrier, wherein the plurality of sets of UE-specific SRS parameters are jointly signaled together via a single radio resource control (RRC) message, wherein the transmitter also transmits a grant to the UE over the primary carrier, and wherein the grant comprises triggering information for the UE to send an aperiodic SRS (ap-SRS) over an indicated carrier using a selected set of UE-specific SRS parameters, and wherein the grant further comprises a carrier indicator field indicating the indicated carrier.

7. The base station of claim 6, wherein each set of UE-specific SRS parameters comprises an SRS bandwidth, a frequency domain position, a transmission comb, a cyclic shift, and a number of antenna ports.

8. The base station of claim 6, wherein the plurality of sets of UE-specific SRS parameters are configured as part of physical parameters of the RRC message, and wherein the RRC message configures ap-SRS for multiple secondary carriers.

9. The base station of claim 6, wherein the grant is transmitted in a physical downlink control channel (PDCCH) that supports multiple downlink control information (DCI) formats, and wherein each DCI format corresponds to one or more sets of predefined UE-specific SRS parameters configured via upper layer messaging.

10. The base station of claim 6, wherein the SRS parameters are transmitted via direct signaling or delta signaling.

11. A method comprising:

receiving, by a user equipment, a plurality of sets of UE-specific sounding reference signal (SRS) parameters from a base station via upper layer messaging in a multi-carrier wireless communication system, wherein the plurality sets of UE-specific SRS parameters are associated with aperiodic SRS (ap-SRS) transmission over different carriers by the UE, and wherein the plurality of sets of UE-specific SRS parameters are jointly signaled together via a single radio resource control (RRC) message;

receiving a grant from the base station over a primary carrier, wherein the grant comprises triggering information for the UE to send an aperiodic SRS (ap-SRS) over an indicated carrier using a selected set of UE-specific SRS parameters, and wherein the grant further comprises a carrier indicator field indicating the indicated carrier; and

transmitting the ap-SRS over the indicated carrier using the selected set of UE-specific SRS parameters.

12. The method of claim 11, wherein each set of UE-specific SRS parameters comprises an SRS bandwidth, a frequency domain position, a transmission comb, a cyclic shift, and a number of antenna ports.

13. The method of claim 11, wherein the plurality of sets of UE-specific SRS parameters are configured as part of physical parameters of the RRC message, and wherein the RRC message configures ap-SRS for multiple secondary carriers.

14. The method of claim 11, wherein the grant is transmitted in a physical downlink control channel (PDCCH) that supports multiple downlink control information (DCI) formats, and wherein each DCI format corresponds to one or more sets of predefined UE-specific SRS parameters configured via upper layer messaging.

15. The method of claim 11, wherein the SRS parameters are transmitted via direct signaling or delta signaling.

16. The method of claim 11, wherein each SRS parameter is signaled directly without further processing.

17. The method of claim 11, wherein a part of the SRS parameters are signaled in a differential way as compared to a reference point.

18. A user equipment (UE) comprising:

a receiver that receives a plurality of sets of UE-specific sounding reference signal (SRS) parameters from a base station via upper layer messaging in a multi-carrier wireless communication system, wherein the plurality sets of UE-specific SRS parameters are associated with aperiodic SRS (ap-SRS) transmission over different carriers by the UE, wherein the plurality of sets of UE-specific SRS parameters are jointly signaled together via a single radio resource control (RRC) message, wherein the UE also receives a grant from the base station over a primary carrier, wherein the grant comprises triggering information for the UE to send an aperiodic SRS (ap-SRS) over an indicated carrier using a selected set of UE-specific SRS parameters, and wherein the grant further comprises a carrier indicator field indicating the indicated carrier; and

a transmitter that transmits the ap-SRS over the indicated carrier using the selected set of UE-specific SRS parameters.

19. The UE of claim 18, wherein each set of UE-specific SRS parameters comprises an SRS bandwidth, a frequency domain position, a transmission comb, a cyclic shift, and a number of antenna ports.

20. The UE of claim 18, wherein the plurality of sets of UE-specific SRS parameters are configured as part of physical parameters of the RRC message, and wherein the RRC message configures ap-SRS for multiple secondary carriers.

21. The UE of claim 18, wherein the grant is transmitted in a physical downlink control channel (PDCCH) that supports multiple downlink control information (DCI) formats, and wherein each DCI format corresponds to one or more sets of predefined UE-specific SRS parameters configured via upper layer messaging.

22. The UE of claim 18, wherein the SRS parameters are transmitted via direct signaling or delta signaling.

23. The UE of claim 18, wherein each SRS parameter is signaled directly without further processing.

24. The UE of claim 18, wherein a part of the SRS parameters are signaled in a differential way as compared to a reference point.