Coordinated Multipoint Transmission and Reception (CoMP)

• US 20140045510A1
• Filed: 07/23/2013
• Published: 02/13/2014
• Est. Priority Date: 07/25/2012
• Status: Abandoned Application

• Current Assignee: NEC Laboratories America Inc (NEC Corporation)
• Original Assignee: NEC Laboratories America Inc (NEC Corporation)
• Inventors: Yue, Guosen, Prasad, Narayan, Jiang, Meilong, Rangarajan, Sampath
• Application Number:
  US13/948,388
• Publication Number:
  US 20140045510A1
• Time in Patent Office: Days
• US Class Current: 455/450
• 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 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A communications method implemented in a transmission point (TP) used in a coordinated multipoint transmission and reception (CoMP) system is disclosed. The communications method includes transmitting, to a user equipment (UE), an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes, wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes. Other methods, apparatuses, and systems are also disclosed.

Claims

1. A communications method implemented in a transmission point (TP) used in a coordinated multipoint transmission and reception (CoMP) system, the communications method including:

transmitting, to a user equipment (UE), an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes,

wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and

wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes.

2. The communications method as in claim 1, wherein the RI for said at least one of the other CSI processes is not based on any other CSI process other than said at least one of the other CSI processes.

3. The communications method as in claim 1, wherein the RI is computed by the UE for said at least one of the other CSI processes.

4. The communications method as in claim 1, wherein the indication is transmitted semi-statically.

5. The communications method as in claim 1, wherein the TP comprises a macro-cell base station (BS) or a low power remote radio head (RRH).

6. A communications method implemented in a user equipment (UE) used in a coordinated multipoint transmission and reception (CoMP) system, the communications method including:

receiving, from a transmission point (TP), an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes,

wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and

wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes.

7. The communications method as in claim 6, wherein the RI for said at least one of the other CSI processes is not based on any other CSI process other than said at least one of the other CSI processes.

8. The communications method as in claim 6, wherein the RI is computed by the UE for said at least one of the other CSI processes.

9. The communications method as in claim 6, wherein the indication is received semi-statically.

10. The communications method as in claim 6, wherein the TP comprises a macro-cell base station (BS) or a low power remote radio head (RRH).

11. A communications method implemented in a coordinated multipoint transmission and reception (CoMP) system, the communications method including:

indicating, to a user equipment (UE), a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes;

configuring the UE with the CSI process for at least one of the other CSI processes in the CSI pattern;

reporting, from the UE, a rank indication (RI) for the CSI process that is the same as an RI for said at least one of the other CSI processes.

12. The communications method as in claim 11, wherein the RI for said at least one of the other CSI processes is not based on any other CSI process other than said at least one of the other CSI processes.

13. The communications method as in claim 11, wherein the RI is computed by the UE for said at least one of the other CSI processes.

14. The communications method as in claim 11, wherein the indication is transmitted semi-statically.

15. A transmission point (TP) used in a coordinated multipoint transmission and reception (CoMP) system, the TP including:

transmitter to transmit, to a user equipment (UE), an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes,

wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and

wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes.

16. A user equipment (UE) used in a coordinated multipoint transmission and reception (CoMP) system, the user equipment including:

a receiver to receive, from a transmission point (TP), an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes,

wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and

wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes.

17. A coordinated multipoint transmission and reception (CoMP) system including:

a user equipment (UE); and

a transmission point (TP) to transmit, to the UE, an indication of a channel state information (CSI) process in a CSI pattern comprising a set of CSI processes,

wherein the UE is configured with the CSI process for at least one of the other CSI processes in the CSI pattern, and

wherein a reported rank indication (RI) for the CSI process is the same as an RI for said at least one of the other CSI processes.