Interference measurements in enhanced inter-cell interference coordination capable wireless terminals

• US 8,837,301 B2
• Filed: 11/02/2011
• Issued: 09/16/2014
• Est. Priority Date: 11/08/2010
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Krishnamurthy, Sandeep H.
• Primary Examiner(s): WONG, XAVIER S
• Application Number:
  US13/287,508
• Publication Number:
  US 20120113844A1
• Time in Patent Office: 1,049 Days
• Field of Search: 370/242, 370/395.21, 370/395.42, 375/240.27, 714/707, 714/751
• US Class Current: 370/242
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• 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 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/203 Details of error rate determination, e.g. BER, FER or WER
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/04 Error control

Abstract

A wireless communication terminal is disclose. The terminal includes a transceiver coupled to a processor configured to determine that a subset of a plurality of REs must be excluded from demodulation, the plurality of resource elements (REs) received in a signal from a first base station, to estimate a hypothetical block error rate (BLER) based on the signal received from the first base station by excluding the subset of the plurality of Res, and to estimate channel state information based on the hypothetical block error rate (BLER).

Claims

1. A wireless communication terminal comprising;

a transceiver coupled to a processor; and

the processor, the processor configured to determine that a subset of a plurality of resource elements (“

REs”

) must be excluded from demodulation, the plurality of REs received in a signal from a first base station, the processor configured to estimate a hypothetical block error rate (“

BLER”

) based on the signal received from the first base station by excluding the subset of the plurality of REs, and the processor configured to estimate channel state information based on the hypothetical BLER;

wherein the subset of the plurality of REs corresponds to a signal transmitted from a second base station; and

wherein the processor is further configured to determine that the subset of the plurality of REs must be excluded based on at least one of;

an indication from the first base station and determining that a signal power from the second base station exceeds a threshold.

2. The terminal of claim 1 wherein the channel state information is one of:

a channel quality indication, a modulation and coding scheme, a rank indication, a precoding matrix indication, an out-of synchronization determination, and an in-sync determination.

3. The terminal of claim 1 wherein the signal transmitted over the plurality of REs includes a convolutionally-coded transmission.

4. The terminal of claim 3 wherein the convolutionally-coded transmission is a downlink control information with format 1A or format 1C.

6. The terminal of claim 1;

wherein the processor is further configured to determine at least one of;

a channel estimate and a noise variance estimate based on the signal received from the first base station; and

wherein the processor is further configured to estimate the hypothetical BLER from at least one of the channel estimate and the noise variance estimate using a mapping function.

7. The terminal of claim 6 wherein the processor is further configured to determine the subset of the plurality of REs based on at least one of a physical cell identifier of the second base station, a number of transmission antenna ports of the second base station, and a transmission bandwidth of the second base station.

8. The terminal of claim 6:

wherein the processor is further configured to use a first mapping function upon determining that the received signal power from the second base station exceeds a second threshold; and

wherein the processor is further configured to use a second mapping function upon determining that the received signal power from the second base station is less than a first threshold.

9. The terminal of claim 6 wherein the processor is further configured for:

using a first mapping function based on an indication from the first base station to enable interference cancellation or interference rejection capability; and

using a second mapping function in the absence of such an indication.

5. The terminal of 1 wherein the signal transmitted over the plurality of REs includes a turbo-coded transmission associated with a physical downlink shared channel.