Method and apparatus for uplink network MIMO in a wireless communication system

• US 8,934,395 B2
• Filed: 10/13/2009
• Issued: 01/13/2015
• Est. Priority Date: 10/24/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei Y., Palanki, Ravi
• Primary Examiner(s): Yuen, Kan
• Application Number:
  US12/578,056
• Publication Number:
  US 20100103834A1
• Time in Patent Office: 1,918 Days
• Field of Search: 370/252, 370/315, 370/328, 370/329, 370/332, 370/338, 370/341, 455450-4522
• US Class Current: 370/315
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• 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

Abstract

Systems and methodologies are described herein that facilitate generation and processing of control signaling to support uplink network multiple-in-multiple-out (N-MIMO) communication in a wireless communication system. As described herein, respective network nodes associated with an uplink N-MIMO framework can generate channel state information (CSI) corresponding to an uplink channel from a designated network user to the respective nodes. Generated CSI can subsequently be communicated to an uplink anchor node for the network user in order to facilitate rate assignment, scheduling, and/or other operations with respect to the network user. As described herein, CSI generated and reported by respective cells can include channel profiles, carrier/interference profiles, estimated supported uplink rates, or the like. As additionally described herein, supplemental information such as observed interference levels, demodulation indicators, or the like can be communicated to an anchor node and utilized in rate assignment and/or scheduling.

Claims

1. A method, comprising:

receiving, by an anchor node, channel state information (CSI) reports, which comprise UE channel time/frequency profiles, from one or more cooperating network nodes, wherein the anchor node and the one or more cooperating network nodes are configured to cooperatively receive uplink transmissions, from a user equipment unit (UE), using a network multiple-in multiple out (N-MIMO) technique, wherein the N-MIMO technique includes the one or more cooperating network nodes and the anchor node, connected via one or more backhaul links, receiving uplink signals in parallel from the UE; and

computing, by the anchor node, a communication rate to be assigned to the UE for communication with the one or more cooperating network nodes based at least in part on the CSI reports.

2. The method of claim 1, wherein the UE channel time/frequency profiles comprising phase information and amplitude information.

3. The method of claim 2, wherein the UE channel time/frequency profiles are normalized by interference.

4. The method of claim 1, wherein the receiving comprises receiving UE carrier to interference (C/I) ratio time/frequency profiles from the one or more cooperating network nodes.

5. The method of claim 1, wherein:

the receiving comprises receiving estimated rates supported on an associated uplink channel from the UE to the one or more cooperating network nodes; and

the computing comprises computing a communication rate to be assigned to the UE at least in part by combining the estimated rates received from the one or more cooperating network nodes.

6. The method of claim 5, wherein the computing further comprises combining the estimated rates received from the one or more cooperating network nodes at least in part by selecting a highest estimated rate from among the estimated rates received from the one or more cooperating network nodes.

7. The method of claim 1, further comprising receiving interference information from the one or more cooperating network nodes across which cooperative reception of transmissions from the UE is performed, wherein the computing comprises computing a communication rate to be assigned to the UE for communication with the one or more cooperating network nodes based at least in part on the interference information.

8. The method of claim 1, further comprising:

receiving acknowledgement (ACK) or negative acknowledgement (NACK) signaling from the one or more cooperating network nodes each indicative of successful or unsuccessful modulation of a transmissions from the UE; and

generating a transmission schedule for the UE based at least in part on the ACK or NACK signaling.

9. The method of claim 1, further comprising conveying a computed communication rate to an associated UE in an uplink grant signaling message to the UE.

10. A wireless communications apparatus, comprising:

a memory, of an anchor node, that stores data relating to a network user and one or more cooperative network nodes associated with uplink network multiple-in-multiple-out (N-MIMO) communication with the network user, wherein the N-MIMO communication includes the one or more cooperative network nodes and the anchor node connected via one or more backhaul links receiving uplink signals in parallel from a user equipment unit (UE); and

a processor of the anchor node configured to receive channel state information of a receiver (CSIR) reports, which comprise time/frequency profiles corresponding to an uplink channel between the network user and the one or more cooperative network nodes, from the one or more cooperative network nodes and to calculate a communication rate to be assigned to the network user based at least in part on the CSIR reports.

11. The wireless communications apparatus of claim 10, wherein the time/frequency profiles comprising phase information and amplitude information.

12. The wireless communications apparatus of claim 10, wherein the CSIR reports comprise carrier to interference (C/I) ratio time/frequency profiles relating to carrier and interference levels observed by the one or more cooperative network nodes.

13. The wireless communications apparatus of claim 10, wherein the CSIR reports comprise estimated rates supported by the one or more cooperative network nodes on an uplink channel from the network user to the one or more cooperative network nodes and the processor is further configured to calculate a communication rate to be assigned to the network user at least in part by combining the estimated rates received from the one or more cooperative network nodes.

14. The wireless communications apparatus of claim 13, wherein the processor is further configured to combine the estimated rates received from the one or more cooperative network nodes by selecting a highest estimated rate from among the estimated rates.

15. The wireless communications apparatus of claim 10, wherein the processor is further configured to receive interference reports from the one or more cooperative network nodes and to calculate a communication rate to be assigned to the network user based at least in part on the interference reports.

16. The wireless communications apparatus of claim 10, wherein the processor is further configured to transmit a communication rate calculated for a network user within uplink grant signaling to the network user.

17. An apparatus, comprising:

means for obtaining, by an anchor node, uplink channel state information of the receiver (CSIR) reports, which comprise UE channel time/frequency profiles relating to a user equipment unit (UE), from one or more cooperating network nodes within a coordinated reception framework associated with the UE, using a network multiple-in multiple out (N-MIMO) technique, wherein the N-MIMO technique includes the one or more cooperating network nodes and the anchor node connected via one or more backhaul links receiving uplink signals in parallel from the UE; and

means for performing rate assignment, by the anchor node, for the UE based at least in part on the uplink CSIR reports.

18. The apparatus of claim 17, wherein the UE channel time/frequency profiles comprising phase information and amplitude information.

19. The apparatus of claim 17, wherein the means for obtaining comprises means for obtaining UE carrier to interference (C/I) ratio time/frequency profiles from the one or more cooperating network nodes.

20. The apparatus of claim 17, wherein:

the means for obtaining comprises means for obtaining information relating to estimated rates supported on an associated uplink channel from the UE to the one or more cooperating network nodes; and

the means for performing rate assignment comprises means for performing rate assignment for the UE at least in part by combining information relating to estimated rates obtained from the one or more cooperating network nodes.

21. The apparatus of claim 20, wherein the means for performing rate assignment further comprises means for combining information relating to estimated rates obtained from the one or more cooperating network nodes at least in part by selecting a highest estimated rate indicated in the information relating to estimated rates obtained from the one or more cooperating network nodes.

22. A computer program product, comprising:

a non-transitory computer-readable medium, comprising;

code for causing a computer to obtain, by an anchor node, uplink channel state information of a receiver (CSIR) reports, which comprise UE channel time/frequency profiles relating to a user equipment unit (UE), from one or more cooperating network nodes within a coordinated reception framework associated with the UE using a network multiple-in multiple out (N-MIMO) technique, wherein the N-MIMO technique includes the one or more cooperating network nodes and the anchor node connected via one or more backhaul links receiving uplink signals in parallel from the UE; and

code for causing the computer to perform rate assignment, by the anchor node, for the UE based at least in part on the uplink CSIR reports.

23. The computer program product of claim 22, wherein the UE channel time/frequency profiles comprising phase information and amplitude information.

24. The computer program product of claim 22, wherein the code for causing the computer to obtain comprises code for causing the computer to obtain UE carrier to interference (C/I) ratio time/frequency profiles from the one or more cooperating network nodes.

25. The computer program product of claim 22, wherein:

the code for causing the computer to obtain comprises code for causing the computer to obtain information relating to estimated rates supported on an associated uplink channel from the UE to the one or more cooperating network nodes; and

the code for causing the computer to perform rate assignment comprises code for causing the computer to perform rate assignment for the UE at least in part by combining information relating to estimated rates obtained from the one or more cooperating network nodes.