EPDCCH resource and quasi-co-location management in LTE

• US 9,788,310 B2
• Filed: 05/21/2015
• Issued: 10/10/2017
• Est. Priority Date: 11/02/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chen, Wanshi, Geirhofer, Stefan, Gaal, Peter, Xu, Hao, Luo, Tao
• Primary Examiner(s): Choudhry, Samina
• Application Number:
  US14/719,171
• Publication Number:
  US 20150257137A1
• Time in Patent Office: 873 Days
• Field of Search: 370329, 455418
• 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: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• 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 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. In an aspect, the apparatus may determine at least a first and second resource set configured for a control channel and may determine a common set of aggregation levels for the first and second resource sets. The apparatus may further determine first rate-matching parameters for the first resource set and second rate-matching parameters for the second resource set, and may process the control channel using the common set of aggregation levels and the first and second rate-matching parameters.

Claims

1. A method of wireless communication at a user equipment (UE), comprising:

determining, at the UE, at least a first resource set and a second resource set configured for an enhanced physical downlink control channel (EPDCCH);

determining, at the UE, a common set of aggregation levels based on a first set of aggregation levels for the first resource set and a second, different set of aggregation levels for the second resource set;

determining, at the UE, first rate-matching parameters for the first resource set and second rate-matching parameters for the second resource set, the first rate-matching parameters being different from the second rate-matching parameters; and

processing the control channel, at the UE, using at least the common set of aggregation levels and the first rate-matching parameters and second rate-matching parameters.

2. The method of claim 1, wherein the determining the common set of aggregation levels for the first resource set and the second resource sets comprises determining:

a first number of available resources in the first resource set,

a second number of available resources in the second resource set,

or both.

3. The method of claim 2, wherein the determining the common set of aggregation levels further comprises:

comparing the first number of available resources to a threshold value, the second number of available resources to the threshold value, or both; and

selecting the common set of aggregation levels based on the comparison.

4. The method of claim 1, wherein the first rate-matching parameters are configured to rate-match around all channel state information reference signals (CSI-RS) in the first resource set or rate-match around a subset of the CSI-RS in the first resource set, and

wherein the second rate-matching parameters are configured to rate-match around all of the CSI-RS on the second resource set or rate-match around a subset of the CSI-RS on the second resource set.

5. The method of claim 1, wherein the first rate-matching parameters are configured to rate-match around all cell-specific reference signals (CRS) in the first resource set or rate-match around a subset of the CRS on the first resource set, and

wherein the second rate-matching parameters are configured to rate-match around all of the CRS on the second resource set or rate-match around a subset of the CRS in the second resource set.

6. The method of claim 1, wherein the first rate-matching parameters are determined based on a first radio resource control (RRC) configuration and the second rate-matching parameters are determined based on a second RRC configuration.

7. An apparatus for wireless communication at a user equipment (UE), comprising:

means for determining, at the UE, at least a first resource set and a second resource set configured for an enhanced physical downlink control channel (EPDCCH);

means for determining, at the UE, a common set of aggregation levels based on a first set of aggregation levels for the first resource set and a second, different set of aggregation levels for the second resource set;

means for determining, at the UE, first rate-matching parameters for the first resource set and second rate-matching parameters for the second resource set, the first rate-matching parameters being different from the second rate-matching parameters; and

means for processing, at the UE, the control channel using at least the common set of aggregation levels and the first rate-matching parameters and second rate-matching parameters.

8. The apparatus of claim 7, wherein the means for determining the common set of aggregation levels for the first resource set and the second resource sets determines:

a first number of available resources in the first resource set,

a second number of available resources in the second resource set,

or both.

9. The apparatus of claim 8, wherein the means for determining the common set of aggregation levels is further configured to:

compare the first number of available resources to a threshold value, the second number of available resources to the threshold value, or both; and

select the common set of aggregation levels based on the comparison.

10. An apparatus for wireless communication at a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

determine, at the UE, at least a first resource set and a second resource set configured for an enhanced physical downlink control channel (EPDCCH);

determine, at the UE, a common set of aggregation levels based on a first set of aggregation levels for the first resource set and a second, different set of aggregation levels for the second resource set;

determine, at the UE, first rate-matching parameters for the first resource set and second rate-matching parameters for the second resource set, the first rate-matching parameters being different from the second rate-matching parameters; and

process, at the UE, the control channel using at least the common set of aggregation levels and the first rate-matching parameters and second rate-matching parameters.

11. The apparatus of claim 10, wherein the determining the common set of aggregation levels for the first resource set and the second resource sets comprises determining:

a first number of available resources in the first resource set,

a second number of available resources in the second resource set,

or both.

12. The apparatus of claim 11, wherein the determining the common set of aggregation levels further comprises:

comparing the first number of available resources to a threshold value, the second number of available resources to the threshold value, or both; and

selecting the common set of aggregation levels based on the comparison.

13. The apparatus of claim 10, wherein the first rate-matching parameters are configured to rate-match around all channel state information reference signals (CSI-RS) in the first resource set or rate-match around a subset of the CSI-RS in the first resource set, and

wherein the second rate-matching parameters are configured to rate-match around all of the CSI-RS on the second resource set or rate-match around a subset of the CSI-RS on the second resource set.

14. The apparatus of claim 10, wherein the first rate-matching parameters are configured to rate-match around all cell-specific reference signals (CRS) in the first resource set or rate-match around a subset of the CRS on the first resource set, and

wherein the second rate-matching parameters are configured to rate-match around all of the CRS on the second resource set or rate-match around a subset of the CRS in the second resource set.

15. The apparatus of claim 10, wherein the first rate-matching parameters are determined based on a first radio resource control (RRC) configuration and the second rate-matching parameters are determined based on a second RRC configuration.

16. A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), comprising code for:

determining, at the UE, at least a first resource set and a second resource set configured for an enhanced physical downlink control channel (EPDCCH);

determining, at the UE, a common set of aggregation levels based on a first set of aggregation levels for the first resource set and a second, different set of aggregation levels for the second resource set;

determining, at the UE, first rate-matching parameters for the first resource set and second rate-matching parameters for the second resource set, the first rate-matching parameters being different from the second rate-matching parameters; and

processing, at the UE, the control channel using at least the common set of aggregation levels and the first rate-matching parameters and second rate-matching parameters.

17. The computer-readable medium of claim 16, wherein the determining the common set of aggregation levels for the first resource set and the second resource sets comprises determining:

a first number of available resources in the first resource set,

a second number of available resources in the second resource set,

or both.

18. The computer-readable medium of claim 17, wherein the determining the common set of aggregation levels further comprises:

comparing the first number of available resources to a threshold value, the second number of available resources to the threshold value, or both; and

selecting the common set of aggregation levels based on the comparison.