COGNITIVE RADIO SYSTEM, RESOURCE ALLOCATION APPARATUS THEREOF AND METHOD THEREFOR

• US 20150131550A1
• Filed: 04/23/2013
• Published: 05/14/2015
• Est. Priority Date: 05/28/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Guo, Xin
• Granted Patent: US 9,444,663 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Disclosed is a cognitive radio system, resource allocation apparatus thereof and method therefor. A resource allocation apparatus comprises: a transmission opportunity assessment device which is used to assess availabilities of transmission opportunities in radio resources of a primary communication system; a vector production device which is used to set a transmission opportunity selection vector for each secondary user in the cognitive radio system based on assessment results of the availabilities of transmission opportunities, wherein the transmission opportunity selection vector includes information for identifying multiple transmission opportunities assessed available; and a sending device which is used to distribute the transmission opportunity selection vector to the secondary user.

Claims

1. A resource allocation apparatus in a cognitive radio system, comprising:

a transmission opportunity evaluating device configured to evaluate availability of transmission opportunities in wireless resources of a primary communication system;

a vector generating device configured to set a transmission opportunity selection vector for each secondary user in the cognitive radio system according to a result of the evaluating of the availability of the transmission opportunities, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

a transmitting device configured to transmit the transmission opportunity selection vector to the secondary user.

2. The resource allocation apparatus of claim 1, wherein the vector generating device is configured to set the transmission opportunity selection vector by arranging the plurality of transmission opportunities that have been evaluated as available in an order based on availability values of the plurality of transmission opportunities that have been evaluated as available.

3. The resource allocation apparatus of claim 1, wherein the transmission opportunities that have been evaluated as available at the same corresponding positions of transmission opportunities selection vectors set by the vector generating device for different secondary users are different from each other

4. The resource allocation apparatus of claim 1, wherein the transmission opportunity evaluating device is configured to evaluate availability of a transmission opportunity to be evaluated by calculating contiguous idle time duration statistic of a frequency band in which the transmission opportunity is located within a past predetermined time period,

wherein the contiguous idle time duration statistic comprises one or more of the following parameters:

an average time length of contiguous idle time durations of the frequency band in which the transmission opportunity is located within the time period;

a time length of a contiguous idle time duration which occurs most frequently of the frequency band in which the transmission opportunity is located within the time period;

a time length of a contiguous idle time duration in which a corresponding time point is located of the frequency band in which the transmission opportunity is located within the time period; and

number of accumulated contiguous idle time durations of the frequency band in which the transmission opportunity is located within the time period.

5. The resource allocation apparatus of claim 1, wherein the transmission opportunity evaluating device is further configured to evaluate, for each secondary user, availability of a transmission opportunity to be evaluated by calculating a transmission result estimator of the secondary user on a frequency band corresponding to the transmission opportunity,

wherein the transmission opportunity evaluating device is configured to calculate number of times of data transmission successes of the secondary user on the frequency band corresponding to the transmission opportunity within a predetermined time period prior to current time point or a ratio of the number of times of the data transmission successes to a total number of times that the secondary user attempts to perform data transmission on the frequency band corresponding to the transmission opportunity, as the transmission result estimator of the transmission opportunity.

6. A resource utilization apparatus in a cognitive radio system, comprising:

a receiving device configured to receive a transmission opportunity selection vector for the resource utilization apparatus, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

a sensing device configured to sense each transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, to judge whether the transmission opportunity is currently available, and if yes, to determine that the transmission opportunity is available for data transmission.

7. The resource utilization apparatus of claim 6, wherein the information for identifying the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector are arranged in an order based on availability values of the plurality of transmission opportunities that have been evaluated as available, and

wherein the sensing device is further configured to:

sense a transmission opportunity that has been evaluated as available corresponding to a largest availability value among the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector to judge whether the transmission opportunity that has been evaluated as available corresponding to the largest availability value is currently available, and if yes, to determine that the transmission opportunity that has been evaluated as available corresponding to the largest availability value is currently available for data transmission, otherwise, to sequentially sense a next transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, until a currently available transmission opportunity is found or until there is no selectable transmission opportunity that has been evaluated as available in the transmission opportunity selection vector.

8. The resource utilization apparatus of claim 6, further comprising:

a transmitting device configured to feed back transmission result information regarding data transmission by using the transmission opportunity.

9. The resource utilization apparatus of claim 8, wherein the transmission result information comprises a transmission result vector and/or a transmission result value, the transmission result vector comprises information indicating whether each of transmission opportunities in the transmission opportunity selection vector is available for the secondary user and/or whether data transmission is successful, and the transmission result value indicates a position of the transmission opportunity used by the secondary user in the transmission opportunity selection vector.

10. A resource allocation method in a cognitive radio system, comprising:

evaluating availability of transmission opportunities in wireless resources of a primary communication system;

setting a transmission opportunity selection vector for each secondary user in the cognitive radio system according to a result of the evaluating of the availability of the transmission opportunities, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

transmitting the transmission opportunity selection vector to the secondary user.

11. The resource allocation method of claim 10, wherein the information for identifying the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector are arranged in an order based on availability values of the plurality of transmission opportunities that have been evaluated as available.

12. The resource allocation method of claim 10, wherein the transmission opportunities that have been evaluated as available at the same corresponding positions of transmission opportunities selection vectors selected for different secondary users are different from each other.

13. The resource allocation method of claim 10, wherein evaluating availability of a transmission opportunity comprises:

calculating contiguous idle time duration statistic of a frequency band in which the transmission opportunity is located within a past predetermined time period, and

wherein the contiguous idle time duration statistic comprises one or more of the following parameters;

an average time length of contiguous idle time durations of the frequency band in which the transmission opportunity is located within the time period;

a time length of a contiguous idle time duration which occurs most frequently of the frequency band in which the transmission opportunity is located within the time period;

a time length of a contiguous idle time duration in which a corresponding time point is located of the frequency band in which the transmission opportunity is located within the time period; and

number of accumulated contiguous idle time durations of the frequency band in which the transmission opportunity is located within the time period.

14. The resource allocation method of claim 10, wherein evaluating availability of a transmission opportunity further comprises:

evaluating, for each secondary user, availability of the transmission opportunity to be evaluated by calculating a transmission result estimator of the secondary user on a frequency band corresponding to the transmission opportunity,

wherein calculating the transmission result estimator comprises;

calculating number of times of data transmission successes of the secondary user on the frequency band corresponding to the transmission opportunity within a predetermined time period prior to current time point or a ratio of the number of times of the data transmission successes to a total number of times that the secondary user attempts to perform data transmission on the frequency band corresponding to the transmission opportunity, as the transmission result estimator of the transmission opportunity.

15. A resource utilization method in a cognitive radio system, comprising:

receiving, by a secondary user in the cognitive radio system, a transmission opportunity selection vector for the secondary user, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

selecting a transmission opportunity from the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector, and sensing the selected transmission opportunity to judge whether the transmission opportunity is currently available, and if yes, utilizing the transmission opportunity for data transmission, otherwise, sequentially sensing a next transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, until a available transmission opportunity is found or until there is no selectable transmission opportunity that has been evaluated as available in the transmission opportunity selection vector.

16. The resource utilization method of claim 15, wherein the information for identifying the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector are arranged in an order based on availability values of the plurality of transmission opportunities that have been evaluated as available, and

wherein selecting a transmission opportunity from the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector comprises:

sensing a transmission opportunity that has been evaluated as available corresponding to a largest availability value among the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector to judge whether the transmission opportunity that has been evaluated as available corresponding to the largest availability value is currently available, and if yes, selecting the transmission opportunity that has been evaluated as available corresponding to the largest availability value for data transmission, otherwise, sequentially sensing a next transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, until a available transmission opportunity is found or until there is no selectable transmission opportunity that has been evaluated as available in the transmission opportunity selection vector.

17. The resource utilization method of claim 15, further comprising:

feeding back transmission result information regarding data transmission by using the transmission opportunity.

18. The resource utilization method of claim 17, wherein the transmission result information comprises a transmission result vector and/or a transmission result value, the transmission result vector comprises information indicating whether the transmission opportunities in the transmission opportunity selection vector are available for the secondary user and/or whether data transmission is successful, and the transmission result value indicates a position of the transmission opportunity used by the secondary user in the transmission opportunity selection vector.

19. A cognitive radio system, comprising a resource allocation apparatus and a resource utilization apparatus, wherein the resource allocation apparatus comprises:

a transmission opportunity evaluating device configured to evaluate availability of transmission opportunities in wireless resources of a primary communication system;

a vector generating device configured to set a transmission opportunity selection vector for each secondary user in the cognitive radio system according to a result of the evaluating of the availability of the transmission opportunities, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

a transmitting device configured to transmit the transmission opportunity selection vector to the secondary user, and

wherein the resource utilization apparatus comprises;

a receiving device configured to receive the transmission opportunity selection vector for the secondary user, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available; and

a sensing device configured to sense each transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, to judge whether the transmission opportunity is currently available, and if yes, to determine that the transmission opportunity is available for data transmission, otherwise, to sequentially sense a next transmission opportunity that has been evaluated as available in the transmission opportunity selection vector, until an available transmission opportunity is found or until there is no selectable transmission opportunity that has been evaluated as available in the transmission opportunity selection vector.

20. A resource allocation method in a cognitive radio system, comprising:

evaluating availability of transmission opportunities in wireless resources of a primary communication system;

setting a transmission opportunity selection vector for each secondary user in the cognitive radio system according to a result of the evaluating of the availability of the transmission opportunities, the transmission opportunity selection vector comprising information for identifying a plurality of transmission opportunities that have been evaluated as available;

transmitting the transmission opportunity selection vector to each secondary user;

receiving, by the secondary user in the cognitive radio system, the transmission opportunity selection vector for the secondary user; and

selecting, by the secondary user, a transmission opportunity from the plurality of transmission opportunities that have been evaluated as available in the transmission opportunity selection vector, and sensing the selected transmission opportunity to judge whether the transmission opportunity is currently available, and if yes, utilizing the transmission opportunity for data transmission.