DYNAMIC CHANNEL QUALITY MEASUREMENT PROCEDURE IMPLEMENTED IN A WIRELESS DIGITAL COMMUNICATION SYSTEM TO PRIORITIZE THE FORWARDING OF DOWNLINK DATA

• US 20110159908A1
• Filed: 03/07/2011
• Published: 06/30/2011
• Est. Priority Date: 05/14/2001
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, Dick, Stephen G., Terry, Stephen E., Miller, James M., Zeira, Ariela
• Granted Patent: US 8,219,036 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 72/56 based on priority criteria

Abstract

A wireless digital communication system includes a base station in communication with a plurality of user equipment mobile terminals (UEs). The system prioritizes the forwarding of blocks of downlink data to designated ones of the UEs. The system employs adaptive modulation and coding (AM&C) to achieve improved radio resource utilization and provides optimum data rates for user services. Blocks of downlink (DL) data are received by the base station which requests downlink (DL) channel quality measurements only from those mobile terminals (UEs) with pending downlink transmissions. The UEs respond to the request by measuring and reporting DL channel quality to the base station, which then allocates resources such that the UEs will make best use of radio resources. The base station notifies the UEs of the physical channel allocation indicating the modulation/coding rate and allocated slots followed by transmission of blocks of downlink data which are transmitted to the UEs.

Claims

1. A method of for requesting channel quality measurement report, the method comprising:

transmitting at least one request to provide a channel quality (CQ) measurement report;

receiving a CQ measurement report in response to the request;

transmitting an allocation of radio resources that is based on the transmitted CQ measurement report; and

transmitting downlink data in accordance with the allocation of radio resources.

2. The method of claim 1 wherein the allocation of radio resources includes at least one of a coding rate and a modulation type.

3. The method of claim 1 wherein the at least one request to provide a CQ measurement report is transmitted over a common control channel or a dedicated control channel.

4. The method of claim 1 wherein the at least one request to provide a CQ measurement report indicates at least one particular radio resource upon which the corresponding CQ measurement is to be based.

5. A base station comprising:

a transmitter configured to transmit at least one request to provide a channel quality (CQ) measurement report;

a receiver configured to receive a CQ measurement report in response to the request; and

the transmitter further configured to transmit an allocation of radio resources that is based on the transmitted CQ measurement report, and to transmit downlink data in accordance with the allocation of radio resources.

6. The base station of claim 5 wherein the allocation of radio resources includes at least one of a coding rate, and a modulation type.

7. The base station of claim 5 wherein each of the at least one request to provide a CQ measurement report is transmitted over a common control channel or a dedicated control channel.

8. The base station of claim 5 wherein each of the at least one request to provide a CQ measurement report indicates at least one radio resource upon which the corresponding CQ measurement report is to be based.

9. A method for transmitting downlink control information to at least one user equipment (UE), the method comprising:

transmitting by a base station a request to provide a channel quality (CQ) measurement report;

receiving by the base station a CQ measurement report in response to the request;

transmitting by the base station downlink control information including an allocation of resources, wherein the downlink control information is distinguished by a UE identity (ID) associated with a specific UE; and

transmitting by the base station downlink data in accordance with the allocation of radio resources.

10. The method of claim 9 wherein the allocation of radio resources includes at least one of a coding rate and a modulation type.

11. The method of claim 9 wherein the request to provide a CQ measurement report is transmitted over a common control channel or a dedicated control channel.

12. The method of claim 9 wherein the request to provide a CQ measurement report indicates at least one particular radio resource upon which the CQ measurement is to be based.

13. The method of claim 9 wherein the allocation of radio resources is based on the received CQ measurement report.

14. A base station comprising:

a transmitter configured to transmit a request to provide a channel quality (CQ) measurement report;

a receiver configured to receive a CQ measurement report in response to the request; and

the transmitter further configured to transmit UE downlink control information to a UE including an allocation of resources, wherein the downlink control information is distinguished by a UE identity (ID) associated with the UE, and to transmit downlink data in accordance with the allocation of radio resources.

15. The base station of claim 14 wherein the allocation of radio resources includes at least one of a coding rate, and a modulation type.

16. The base station of claim 14 wherein the request to provide a CQ measurement report is transmitted over a common control channel or a dedicated control channel.

17. The base station of claim 14 wherein the request to provide a CQ measurement report indicates at least one radio resource upon which the CQ measurements report is to be based.

18. The base station of claim 14 wherein the allocation of radio resources is based on the received CQ measurement report.