IP Library › Granted Patent US 9,125,196
Granted Patent B2
US 9,125,196 · App. 14/173,098 · Granted Sep 1, 2015

Method and system for link adaptation at a mobile station

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Quick Facts
Patent No.
US 9,125,196
App. No.
14/173,098
Granted
Sep 1, 2015
Kind
B2
Abstract

A method for link adaptation at a mobile station ( 120 ) can include the steps of computing ( 220 ) mutual information per coded bit (MIB) metrics on at least one sub-channel for one or more candidate modulation types. The method may average the MIB metrics over at least two sub-channels, generate feedback information including MIB metrics for the plurality of candidate modulation types, and transmit ( 245 ) the feedback information to a base station.

Claims (27)

1. A method for link adaptation at a mobile station, comprising:

for each candidate modulation type of a plurality of candidate modulation types, computing a mutual information per coded bit (MIB) metric for at least one sub-channel of each candidate modulation type, wherein the MIB metric is the mutual information between each coded bit and a log-likelihood radio of that bit based on a receiver type and a signal-to-noise and interference ratio of the sub-channel;

averaging the MIB metrics over the at least one sub-channel of each candidate modulation type to produce a mean MIB (MMIB) metric for each candidate modulation type;

generating feedback information, wherein the feedback information includes the MMIB metric for each of the plurality of candidate modulation types; and

transmitting, in response to a request from a base station for at least one of an MCS feedback and an MIB feedback, the feedback information to the base station.

2. The method according to claim 1 wherein the computing a mutual information per coded bit (MIB) metric comprises:

using eigenvalues of a MIMO transmission with the base station.

3. The method according to claim 1 wherein the computing a mutual information per coded bit (MIB) metric comprises:

using eigen-subspace powers of a MIMO transmission with the base station.

4. The method according to claim 1 wherein the computing a mutual information per coded bit (MIB) metric comprises:

using a condition number of a channel state matrix of a MIMO transmission with the base station.

5. The method according to claim 1 , wherein the generating feedback information comprises:

mapping each MMIB metric to an index based on a predetermined table known to both the mobile station and the base station.

6. The method according to claim 1 , wherein the generating feedback information comprises:

including a recommended setting for one or more MIMO transmission parameters.

7. The method according to claim 1 , wherein the generating feedback information comprises:

including a recommended MIMO transmission mode.

8. The method according to claim 7 , wherein the recommended MIMO transmission mode comprises:

including an open loop MIMO transmission scheme recommendation.

9. The method according to claim 7 , wherein the recommended MIMO transmission mode comprises:

including a closed loop MIMO transmission scheme recommendation.

10. The method according to claim 7 , wherein the recommended MIMO transmission mode comprises:

including a number of coding layers recommendation.

11. The method according to claim 7 , wherein the recommended MIMO transmission mode comprises:

including a number of symbol streams recommendation.

12. The method according to claim 7 , wherein the recommended MIMO transmission mode comprises:

including an antenna beamforming weights vector recommendation.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 18, 2014
From: MOTOROLA MOBILITY LLC
To: GOOGLE TECHNOLOGY HOLDINGS LLC
Reel/Frame 034371/0612 →