Channel quality indicator for time, frequency and spatial channel in terrestrial radio access network

• US 9,184,898 B2
• Filed: 08/01/2005
• Issued: 11/10/2015
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Love, Robert T., Bachu, Raja S., Classon, Brian K., Nory, Ravikiran, Stewart, Kenneth A., Sun, Yakun
• Primary Examiner(s): Ajibade Akonai, Olumide T
• Application Number:
  US11/194,224
• Publication Number:
  US 20070026810A1
• Time in Patent Office: 3,753 Days
• Field of Search: 455/63.1, 455/67.11, 455/67.13, 455/436, 455/452.2, 455/509, 455/513, 455/517, 455/524, 455/525, 455/69, 455450-451, 455/452.1, 455/522, 455/501, 370/203, 370/206, 370/252, 370/329, 370/330, 370/331, 370/341, 370/343, 370/208, 370/465, 370/485, 375/260, 375/144, 375/148, 375/267
• US Class Current: 1/1
• 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 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A wireless communication terminal that communicates on a plurality of sub-carriers divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier. The terminal measures a channel quality indicator (CQI) for a plurality of frequency bands, identifies a subset of frequency bands for which the channel quality indicator has been measured based on a subset criterion, and transmits a report identifying a subset of frequency bands for which a channel quality indicator has been measured or frequency bands not in the subset. In some embodiments, the report also includes a subset CQI value associated with at least the subset of frequency bands identified.

Claims

1. A method in a wireless communication device capable of communicating on first and second channels each comprising a plurality of sub-carriers, each channel is divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier, the method comprising:

measuring a channel quality indicator for a plurality of frequency bands in a first channel;

identifying a subset of frequency bands in the first channel for which the channel quality indicator has been measured based on a subset criterion;

sending information identifying the subset of frequency bands in the first channel for which the channel quality indicator has been measured,

sending a subset channel quality indicator value associated with the subset of frequency bands in the first channel;

measuring a channel quality indicator for a plurality of frequency bands in a second channel;

identifying a subset of frequency bands in the second channel for which the channel quality indicator has been measured based on a subset criterion;

sending information identifying the subset of frequency bands in the second channel for which the channel quality indicator has been measured; and

sending a subset channel quality indicator value associated with the subset of frequency bands in the second channel,

wherein the subset channel quality indicator values for the first and second subsets of frequency bands are sent alternately.

2. The method of claim 1, further comprising receiving information identifying the plurality of frequency bands for which the channel quality indicator is to be measured before measuring.

3. The method of claim 1, sending a function of the channel quality indicator measured for the subset of frequency bands.

4. The method of claim 3, sending the function of the channel quality indicator measured includes sending at least one of an average of the channel quality indicators measured for the subset of frequency bands, a minimum channel quality indicator measured for the subset of frequency bands, a median channel quality indicator measured for the subset of frequency bands, or a maximum channel quality indictor measured for the subset of frequency bands.

5. The method of claim 1, identifying the subset of frequency bands for which the channel quality indicator has been measured based on a subset criterion includes

identifying at least one frequency band based on a reference channel quality indicator, and

identifying additional frequency bands having a measured channel quality indicator within a distance of the reference channel quality indicator of the at least one frequency band.

6. The method of claim 1, identifying the subset of frequency bands wherein the maximum size of the subset is less than a number corresponding to the plurality of frequency bands.

7. The method of claim 1, identifying the subset of frequency bands wherein the subset criterion is based on traffic type or data service supported by a network in which the wireless communication device operates.

8. The method of claim 1, identifying the subset of frequency bands for which the channel quality indicator has been measured based on a subset criterion that is based at least partly on Doppler frequency.

9. The method of claim 1, receiving a partial control assignment, constructing a full control assignment from the partial control assignment and the frequency band channel quality indicator measurement information.

10. A wireless communication terminal, comprising:

a transceiver capable of communicating on first and second channels each comprising a plurality of sub-carriers, each channel is divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier;

a processor communicably coupled to the transceiver, the processor is configured for measuring a channel quality indicator for a plurality of frequency bands on the first channel,

the processor is configured for measuring a channel quality indicator for a plurality of frequency bands on the second channel and for identifying, based on a subset criterion, a subset of frequency bands for which the channel quality indicator has been measured on the first and second channels,

the processor is configured to send information identifying the subset of frequency bands for which the channel quality indicator has been measured on the first and second channels and to send a subset channel quality indicator value associated with the subset of frequency bands on the first and second channels, and

the processor is configured to cause the transceiver to alternately transmit channel quality indicator values for the first and second subsets of frequency bands.

11. The terminal of claim 10, the channel quality indicator value includes at least one of an average of the channel quality indicators measured for the subset of frequency bands, a minimum channel quality indicator measured for the subset of frequency bands, a median channel quality indicator measured for the subset of frequency bands, or a maximum channel quality indictor measured for the subset of frequency bands.

12. The terminal of claim 10, identifying additional frequency bands having a measured channel quality indicator within a distance of a reference channel quality indicator of at least one frequency band.

13. A wireless communication terminal, comprising:

a transceiver capable of communicating on a plurality of channels each comprising a plurality of sub-carriers, each channel is divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier;

a processor communicably coupled to the transceiver, the processor configured for measuring a channel quality indicator for a plurality of frequency bands for each of the plurality of channels,

the processor is configured for identifying, based on a subset criterion, a subset of frequency bands for which the channel quality indicator has been measured on each of the plurality of channels,

the processor is configured to send information identifying the subset of frequency bands for which the channel quality indicator has been measured on the first and second channels and to send a subset channel quality indicator value associated with the subset of frequency bands on the first and second channels, and

the processor configured to cause the transceiver to transmit channel quality indicator values for each of the plurality of subsets of frequency bands on a round robin basis.