METHOD AND SYSTEM FOR SPECTRUM HANDOVER IN COGNITIVE RADIO NETWORKS

• US 20140323096A1
• Filed: 09/28/2012
• Published: 10/30/2014
• Est. Priority Date: 12/08/2011
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Bai, Wenling, Gao, Zhuo, Jiang, Chenggang, Li, Yuanyuan, Yang, Yu
• Granted Patent: US 9,439,110 B2
• Time in Patent Office: Days
• US Class Current: 455/411
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/72 Subscriber identity
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point
• CPC Class Codes: H04W 36/249 according to timing information

Abstract

Various examples provide a method and a system for spectrum handover in cognitive radio (CR) systems. According to the method, after detecting a user of an authorized system appears at a current working frequency, the base station generates a spectrum handover command and sends the spectrum handover command via a channel identified by the CR DWNDI to instruct the UEs in the cell to perform spectrum handover according to the spectrum handover command.

Claims

1. A method for spectrum handover in cognitive radio (CR) systems, comprising:

generating, by a base station, a spectrum handover command after detecting a user of an authorized system appears at a current working frequency;

sending, by the base station, the spectrum handover command via a channel identified by a CR dedicated wireless network device identity (DWNDI) to instruct user equipments (UE) in a cell to perform spectrum handover according to the spectrum handover command.

2. The method of claim 1, wherein the sending by the base station the spectrum handover command via a channel identified by the CR DWNDI comprises:

determining, by the base station, a repeat number of sending the spectrum handover command, and sending the spectrum handover command according to the repeat number via the channel.

3. The method of claim 1, further comprising:

negotiating, by the base station with the UEs in the cell, the CR DWNDI for sending the spectrum handover command before sending the spectrum handover command via a channel identified by the CR DWNDI.

4. The method of claim 3, wherein the negotiating by the base station with the UEs in the cell the CR DWNDI comprises one of:

statically defining one of wireless network device identities that are reserved but have not been defined in a CR system as the CR DWNDI for UEs in the cell;

selecting, by the base station, one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell, and broadcasting the CR DWNDI to UEs in the cell as system information; and

selecting, by the base station, one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell, and sending the CR DWNDI to UEs in the cell via UE-specific signaling.

5. The method of claim 1, the CR DWNDI comprises:

a CR-radio network temporary identity (RNTI) in a long-term evolution (LTE) system.

6. The method of claim 1, wherein the channel identified by the CR DWNDI comprises:

a physical layer control channel;

or

a physical layer data channel scheduled by the physical layer control channel.

7. The method of claim 6, wherein the channel identified by the CR DWNDI comprises:

a physical downlink control channel (PDCCH) in an LTE system;

wherein the sending by the base station the spectrum handover command via a channel identified by the CR DWNDI comprises;

sending or scheduling, by the base station, the spectrum handover command by using a PDCCH DCI which is in a common search space and is identified by a CR-RNTI.

8. A method for spectrum handover in cognitive radio (CR) systems, comprising:

receiving, by a user equipment (UE), a spectrum handover command sent by a base station from a channel identified by a CR dedicated wireless network device identity (DWNDI); and

performing, by the UE, spectrum handover according to the spectrum handover command.

9. The method of claim 8, wherein the receiving by the UE the spectrum handover command sent by the base station from a channel identified by the CR DWNDI comprises:

checking whether a channel in each downlink sub frame is identified by the CR DWNDI, and receiving the spectrum handover command if a channel is identified by the CR DWNDI.

10. The method of claim 8, further comprising:

negotiating, by the UE with the base station, the CR DWNDI for sending the spectrum handover command before receiving the spectrum handover command sent by the base station from a channel identified by the CR DWNDI.

11. The method of claim 10, wherein the negotiating by the UE with the base station the CR DWNDI comprises one of:

defining one of wireless network device identities that are reserved but have not been defined in a CR system as the CR DWNDI for UEs in the cell;

receiving, by the UE, the CR DWNDI broadcasted by the base station as system information to UEs in the cell after the base station selects one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell; and

receiving, by the UE, the CR DWNDI sent by the base station via UE-specific signaling after the base station selects one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell.

12. A cognitive radio (CR) system, comprising a base station and a user equipment (UE), wherein the base station comprises:

a determining module, configured to generate a spectrum handover command after detecting a user of an authorized system appears at a current working frequency; and

a sending module configured to send the spectrum handover command via a channel identified by a cognitive radio (CR) dedicated wireless network device identity (DWNDI) to instruct user equipments (UE) in a cell to perform spectrum handover according to the spectrum handover command.

13. The CR system of claim 12, wherein

the determining module is further configured to determine a repeat number of sending the spectrum handover command;

and

the sending module is configured to send the spectrum handover command according to the repeat number via the channel identified by the CR DWNDI.

14. The CR system of claim 12, further comprising:

a managing module, configured to negotiate with the UEs in the cell the CR DWNDI for sending the spectrum handover command.

15. The CR system of claim 14, wherein

the managing module is configured to negotiate with the UEs in the cell the CR DWNDI by using one of:

defining one of wireless network device identities that are reserved but have not been defined in a CR system as the CR DWNDI for UEs in the cell;

selecting one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell, and broadcasting the CR DWNDI to UEs in the cell as system information; and

selecting one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell, and sending the CR DWNDI to UEs in the cell via UE-specific signaling.

16. The CR system of claim 12, wherein the UE comprises:

a receiving module, configured to receive a spectrum handover command sent by a base station from a channel identified by a cognitive radio (CR) dedicated wireless network device identity (DWNDI);

a handover module, configured to perform spectrum handover according to the spectrum handover command.

17. The CR system of claim 16, wherein

the receiving module is configured to check whether a channel in each downlink sub frame is identified by the CR DWNDI, and receive the spectrum handover command if a channel is identified by the CR DWNDI.

18. The CR system of claim 16, further comprising:

a managing module, configured to negotiate with the base station the CR DWNDI for sending the spectrum handover command.

19. The CR system of claim 18, wherein

the managing module is configured to negotiate with the base station the CR DWNDI by using one of:

defining one of wireless network device identities that are reserved but have not been defined in a CR system as the CR DWNDI for UEs in the cell;

receiving, by the UE, the CR DWNDI broadcasted by the base station as system information to UEs in the cell after the base station selects one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell; and

receiving, by the UE, the CR DWNDI sent by the base station via UE-specific signaling after the base station selects one of WNDIs that are unreserved and have not been allocated to a UE as the CR DWNDI for UEs in the cell.