Coordinated Multipoint Transmission and Reception (CoMP)
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.
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.