MULTI-RADIO COEXISTENCE

• US 20120327850A1
• Filed: 03/28/2012
• Published: 12/27/2012
• Est. Priority Date: 03/30/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wang, Jibing, Linsky, Joel Benjamin
• Granted Patent: US 8,885,561 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

In a mobile device capable of wireless communications using multiple radio access technologies (RATs), transmit communications of one RAT may cause interference with receive communications of another RAT. In the case of wireless local area network (WLAN) communications, a CTS-to-Self message may control the timing of WLAN communications such that WLAN receptions do not overlap with transmissions of another RAT, such as a Long Term Evolution (LTE) radio. The CTS-to-Self message timing control may be executed by a mobile device operating as a WLAN access point.

Claims

1. A method of wireless communication, comprising:

actively communicating on a first radio access technology (RAT) as part of an end-to-end communication link;

actively communicating on a second RAT as part of the end-to-end communication link; and

sending a message instructing a remote device on the second RAT to temporarily stop transmission, the message being sent at a time calculated to prevent transmission from the remote device from being received during an uplink transmission of the first RAT in the end-to-end communication link.

2. The method of claim 1 in which the message comprises a CTS-to-Self message.

3. The method of claim 2 in which the CTS-to-Self message is sent a guard time ahead of the uplink transmission of the first RAT.

4. The method of claim 1 in which the sending is based at least in part on an indication of potential interference between uplink transmission of the first RAT and downlink communications of the second RAT.

5. The method of claim 1 in which the active communications on the first RAT and the active communications on the second RAT are by a user equipment operating in an access point (AP) mode.

6. An apparatus for wireless communication, comprising:

means for actively communicating on a first radio access technology (RAT) as part of an end-to-end communication link;

means for actively communicating on a second RAT as part of the end-to-end communication link; and

means for sending a message instructing a remote device on the second RAT to temporarily stop transmission, the message being sent at a time calculated to prevent transmission from the remote device from being received during an uplink transmission of the first RAT in the end-to-end communication link.

7. The apparatus of claim 6 in which the message comprises a CTS-to-Self message.

8. The apparatus of claim 7 in which the CTS-to-Self message is sent a guard time ahead of the uplink transmission of the first RAT.

9. The apparatus of claim 6 in which the means for sending is based at least in part on an indication of potential interference between uplink transmission of the first RAT and downlink communications of the second RAT.

10. The apparatus of claim 6 in which the active communications on the first RAT and the active communications on the second RAT are by a user equipment operating in an access point (AP) mode.

11. A computer program product configured for wireless communications, the computer program product comprising:

a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising;

program code to actively communicate on a first radio access technology (RAT) as part of an end-to-end communication link;

program code to actively communicate on a second RAT as part of the end-to-end communication link; and

program code to send a message instructing a remote device on the second RAT to temporarily stop transmission, the message being sent at a time calculated to prevent transmission from the remote device from being received during an uplink transmission of the first RAT in the end-to-end communication link.

12. The computer program product of claim 11 in which the message comprises a CTS-to-Self message.

13. The computer program product of claim 12 in which the CTS-to-Self message is sent a guard time ahead of the uplink transmission of the first RAT.

14. The computer program product of claim 11 in which the program code to send is based at least in part on an indication of potential interference between uplink transmission of the first RAT and downlink communications of the second RAT.

15. The computer program product of claim 11 in which the active communications on the first RAT and the active communications on the second RAT are by a user equipment operating in an access point (AP) mode.

16. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured;

to actively communicate on a first radio access technology (RAT) as part of an end-to-end communication link;

to actively communicate on a second RAT as part of the end-to-end communication link; and

to send a message instructing a remote device on the second RAT to temporarily stop transmission, the message being sent at a time calculated to prevent transmission from the remote device from being received during an uplink transmission of the first RAT in the end-to-end communication link.

17. The apparatus of claim 16 in which the message comprises a CTS-to-Self message.

18. The apparatus of claim 17 in which the CTS-to-Self message is sent a guard time ahead of the uplink transmission of the first RAT.

19. The apparatus of claim 16 in which the sending is based at least in part on an indication of potential interference between uplink transmission of the first RAT and downlink communications of the second RAT.

20. The apparatus of claim 16 in which the active communications on the first RAT and the active communications on the second RAT are by a user equipment operating in an access point (AP) mode.