Interference Measurement In Wireless Networks

• US 20130208604A1
• Filed: 08/10/2012
• Published: 08/15/2013
• Est. Priority Date: 08/12/2011
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Lee, Moon-il, Marinier, Paul, Nayeb Nazar, Shahrokh, Tsai, Allan Y., Zhang, Guodong, Tooher, J. Patrick
• Granted Patent: US 9,456,372 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• 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 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• 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
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

Embodiments contemplate methods, systems, and apparatuses for interference measurement in a wireless communication network, including wireless communication networks the employ MIMO in uplink and/or downlink communication. Embodiments contemplate identifying one or more interference measurement resource elements that may be received from one or more transmission points. Embodiments also contemplate performing interference measurement estimation based at least in part on the identified one or more interference measurement resource elements. Channel state information (CSI) perhaps in the form of reports may be generated based at least in part on the one or more interference measurement estimation. Embodiments also contemplate that the CSI report may be transmitted to one or more nodes. In some embodiments, the one or more interference measurement resource elements may be received as part of a set of resource elements.

Claims

1. A wireless transmit/receive unit (WTRU) comprising:

a processor, the processor configured at least in part to;

identify one or more interference measurement resource elements received from one or more transmission points;

perform interference measurement estimation based at least in part on energy measured in the identified one or more interference measurement resource elements;

generate channel state information (CSI) based at least in part on the one or more interference measurement estimation; and

initiate the transmission of at least one CSI report to one or more nodes.

2. The WTRU of claim 1, wherein the one or more interference measurement resource elements are received as part of a set of resource elements.

3. The WTRU of claim 2, wherein the set of resource elements further includes one or more resource elements that do not contain a physical downlink shared channel (PDSCH) symbol.

4. The WTRU of claim 3, wherein the processor is further configured to perform rate-matching for PDSCH decoding based at least in part on the one or more resource elements that do not contain a (PDSCH) symbol.

5. The WTRU of claim 1, wherein the one or more interference measurement resource elements are received in one or more subframes designated for interference measurement.

6. The WTRU of claim 5, wherein the one or more interference measurement resource elements are received in one or more resource blocks designated for interference measurement, the one or more interference measurement resource elements having a respective position in the one or more interference measurement resource block.

7. The WTRU of claim 2, wherein the set of resource elements are defined as a subset of resource elements of a zero-power channel state indicator reference signal (CSI-RS).

8. The WTRU of claim 1, wherein the one or more interference measurement resource elements are resource elements from one or more interference measurement resources (IMR).

9. The WTRU of claim 1, wherein the one or more interference measurement resource elements correspond to a respective type of interference, and the processor is further configured to identify an estimation method type received from the one or more transmission points, and the performing the interference measurement estimation is further based on the type of interference and the estimation method type.

10. The WTRU of claim 6, wherein the respective positions of the one or more interference measurement resource elements in the one or more interference measurement resource blocks are varied between different one or more interference measurement subframes, the variation based on at least one of a pseudo-random sequence or a modulo function.

11. The WTRU of claim 6 wherein the respective positions of the one or more interference measurement resource elements in the one or more interference measurement resource blocks are varied between at least one of one or more different physical resource blocks (PRB) or one or more different virtual resource blocks (VRB).

12. The WTRU of claim 5, wherein the one or more interference measurement subframes are separated in time, based at least in part on a pseudo-random sequence.

13. The WTRU of claim 6, wherein each of the one or more interference measurement resource elements respectively represent one or more interference measurement resource element instances.

14. The WTRU of claim 13, wherein the processor is further configured to:

identify one or more non-interference measurement resource elements received from the one or more transmission points at respective one or more non-interference measurement resource element instances; and

determine a coincidence condition between at least one of the one or more non-interference measurement resource element instances and at least one of the one or more interference measurement resource element instances.

15. The WTRU of claim 14, wherein the processor is further configured to exclude from the performance of interference measurement estimation the at least one of the one or more interference measurement resource element instances upon the coincidence condition indicating at least one of the one or more interference measurement resource element instances coincided with the at least one of the one or more non-interference measurement resource element instances.

16. A wireless transmit/receive unit (WTRU) comprising:

a processor, the processor configured at least in part to;

identify one or more interference measurement resource elements received from one or more transmission points;

identify one or more resource elements assumed to include a desired signal received from the one or more transmission points;

identify at least one type of channel state information (CSI);

perform interference measurement estimation based at least in part on energy measured in the one or more identified interference measurement resource elements, energy measured in the one or more resource elements assumed to contain a desired signal, and the type of CSI;

generate a channel state information (CSI) report for the identified type of CSI, based at least in part on the interference measurement estimation; and

initiate a transmission of the CSI report to one or more nodes.

17. The WTRU of claim 16, wherein at least one of the one or more resource elements assumed to contain a desired signal is a non-zero-power channel state indicator reference signal (CSI-RS).

18. The WTRU of claim 16, wherein the one or more interference measurement resource elements are received as part of a set of resource elements.

19. The WTRU of claim 16, wherein the processor is further configured to apply at least one of a linear or logarithmic value to the interference measurement estimation.

20. The WTRU of claim 18, wherein the set of resource elements further includes resource elements that do not contain a physical downlink shared channel (PDSCH) symbol and the processor is further configured to perform rate-matching for PDSCH decoding based at least in part on the resource elements that do not contain a PDSCH symbol.