Resource allocation control method and device in mobile radio communications system

• US 20080225788A1
• Filed: 03/10/2008
• Published: 09/18/2008
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kakura, Yoshikazu, Inoue, Takamichi
• Granted Patent: US 8,428,011 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• 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 72/542 using measured or perceived quality
• CPC Class Codes: H04W 92/20 between access points

Abstract

For radio communications between a base station and a mobile station, resource allocation within a resource block including control resources used for control signals (CQI, ACK/NACK) and reference resources used for a reference signal is performed. The base station measures the quality of a channel between the mobile station and the base station itself. Based on the measured channel quality, the base station sets a ratio between resources for the control signals CQI and ACK/NACK in the control resources, and notifies the mobile station of the set resource ratio.

Claims

1. A method of controlling resource allocation in a resource block including control resources used for a plurality of types of control signals and reference resources used for reference signals, to radio communications between a plurality of radio stations, comprising:

measuring propagation channel quality between a first radio station and a second radio station at one or both of the first and second radio stations;

determining resource apportionment of the plurality of types of control signals in the control resources based on the propagation channel quality; and

notifying the other one of the first and second radio stations of the resource apportionment.

2. The method according to claim 1, wherein the first radio station and the second radio station are a base station and a mobile station of a mobile radio communications system, respectively.

3. The method according to claim 2, wherein the first radio station measures the propagation channel quality using the reference signal received from the second station and notifies the second station of the resource apportionment which is determined based on the propagation channel quality.

4. The method according to claim 2, wherein the second radio station measures the propagation channel quality using the reference signal received from the first station and notifies the first station of the resource apportionment which is determined based on the propagation channel quality.

5. The method according to claim 1, wherein the resource apportionment of control and reference resources within the resource block is determined based on the propagation channel quality.

6. The method according to claim 5, wherein the ratio of the control resources within the resource block is increased and the ratio of the reference resources is decreased as the propagation channel quality becomes better.

7. The method according to claim 1, wherein the plurality of types of control signals includes channel quality information which indicates the propagation channel quality, wherein the ratio of resource allocated to the channel quality information within the control resources is increased as the propagation channel quality becomes better.

8. The method according to claim 1, wherein at least one of modulation scheme, encoding rate and transmission power is set for at least one of the plurality of types of control signals based on the propagation channel quality.

9. The method according to claim 8, wherein at least one of controls of:

increasing number of modulation levels;

increasing an encoding rate; and

decreasing transmission power, is performed as the propagation channel quality becomes better.

13. The device according to claim 1, wherein the plurality of types of control signals includes channel quality information which indicates the propagation channel quality, wherein the resource apportionment setting section increases the ratio of resource allocated to the channel quality information within the control resources as the propagation channel quality becomes better.

10. A device for controlling resource allocation in a resource block including control resources used for a plurality of types of control signals and reference resources used for reference signals, to radio communications between a plurality of radio stations, comprising:

a measurement section for measuring propagation channel quality between a first radio station and a second radio station at one or both of the first and second radio stations;

a resource apportionment setting section for determining resource apportionment of the plurality of types of control signals in the control resources based on the propagation channel quality; and

a communication section for notifying the other one of the first and second radio stations of the resource apportionment.

11. The device according to claim 10, wherein the resource apportionment setting section determines resource apportionment of control and reference resources within the resource block based on the propagation channel quality.

12. The device according to claim 11, wherein, as the propagation channel quality becomes better, the resource apportionment setting section increases the ratio of the control resources within the resource block and decreases the ratio of the reference resources.

14. The device according to claim 10, wherein the resource apportionment setting section sets at least one of modulation scheme, encoding rate and transmission power for at least one of the plurality of types of control signals based on the propagation channel quality.

15. The device according to claim 14, wherein the resource apportionment setting section performs at least one of controls of:

increasing number of modulation levels;

increasing an encoding rate; and

decreasing transmission power, as the propagation channel quality becomes better.

16. The device according to claim 10, wherein the first radio station and the second radio station are a base station and a mobile station of a mobile radio communications system, respectively, wherein the communication section of the first radio station notifies the second station of the resource apportionment.

17. The device according to claim 10, wherein the first radio station and the second radio station are a base station and a mobile station of a mobile radio communications system, respectively, wherein the communication section of the second radio station notifies the first station of the resource apportionment.

18. A base station which controls resource allocation in a resource block including control resources used for a plurality of types of control signals and reference resources used for reference signals, to radio communications with a plurality of mobile stations, comprising:

a measurement section for measuring propagation channel quality between the base station and a mobile station using an uplink reference signal received from the mobile station;

a resource apportionment setting section for determining resource apportionment of the plurality of types of control signals in the control resources based on the propagation channel quality; and

a communication section for notifying the mobile station of the resource apportionment.

20. A mobile communications system including a base station according to claim 18.

19. A mobile station which controls resource allocation in a resource block including control resources used for a plurality of types of control signals and reference resources used for reference signals, to radio communications with a base station, comprising:

a measurement section for measuring propagation channel quality between the base station and the mobile station using a downlink reference signal received from the base station;

a resource apportionment setting section for determining resource apportionment of the plurality of types of control signals in the control resources based on the propagation channel quality; and

a communication section for notifying the base station of the resource apportionment using a predetermined resource in the resource block.

21. A mobile communications system including a mobile station according to claim 19.

22. A program instructing a computer to control resource allocation in a resource block including control resources used for a plurality of types of control signals and reference resources used for reference signals, to radio communications between a plurality of radio stations, comprising:

measuring propagation channel quality between a first radio station and a second radio station at one or both of the first and second radio stations;

determining resource apportionment of the plurality of types of control signals in the control resources based on the propagation channel quality; and

notifying the other one of the first and second radio stations of the resource apportionment.