Multi-radio wireless communication device method for synchronizing wireless network and bluetooth communications

• US 8,233,470 B2
• Filed: 06/28/2007
• Issued: 07/31/2012
• Est. Priority Date: 06/28/2007
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Yang, Xue, Sudak, Eran, Guo, Xingang
• Primary Examiner(s): Edouard, Patrick
• Assistant Examiner(s): Ho, Huy C
• Application Number:
  US11/770,200
• Publication Number:
  US 20090003307A1
• Time in Patent Office: 1,860 Days
• Field of Search: 370/350, 370503-520
• US Class Current: 370/350
• CPC Class Codes: H04J 3/0697 Synchronisation in a packet node
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• 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

Embodiments of a multi-radio wireless communication device and methods for synchronizing wireless network and Bluetooth (BT) communications are generally described herein. Other embodiments may be described and claimed. In some embodiments, a BT radio module adjusts a master clock signal by a predetermined step size before each subsequent BT transmission in response to a frame sync pulse from a wireless network radio module to reduce a time difference between subsequent frame sync pulses and synchronization reference points of BT slots.

Claims

1. A multi-radio wireless communication device comprising:

a Bluetooth (BT) radio module to establish a BT link with a BT device; and

a wireless-network radio module to generate a frame sync pulse associated with a frame of an OFDMA wireless network link and to provide the frame sync pulse to the BT radio module,

wherein when the BT link is established prior to the wireless network link, the BT radio module is configured to adjust a master clock signal associated with the BT link by a predetermined step size before each first BT transmission of a BT interval in response to the frame sync pulse to shift positions of BT slots of the BT interval until a time difference between subsequent frame sync pulses and a synchronization reference point of one of the BT slots of the BT interval is reduced to less than a predetermined value,

wherein the predetermined step size is no greater than a maximum value that the BT device is configured to adjust its slave clock to allow the BT link to be maintained with the BT device during the adjustment of the master clock signal, and

wherein when the BT link is not established prior to the wireless network link, the BT radio module establishes the BT link to be initially synchronized with the wireless network link such that the time difference between subsequent frame sync pulses and a synchronization reference point of one of the BT slots of the BT interval is less than the predetermined value.

2. The wireless communication device of claim 1 wherein the BT radio module calculates a first time difference between the frame sync pulse and a prior synchronization reference point and calculates a second time difference between the frame sync pulse and a subsequent synchronization reference point, and

wherein when the first time difference is less than or equal to the second time difference, the BT radio module retards the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

3. The device of claim 2 wherein when the first time difference is greater than the second time difference, the BT radio module advances the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and the frame sync pulses.

4. The device of claim 3 wherein when the first time difference is less than or equal to the second time difference, the BT radio module retards the master clock signal by providing a positive offset to shift positions of one or more of the BT slots within a BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse, and

wherein when the first time difference is greater than the second time difference, the BT radio module advances the master clock signal by providing a negative offset to shift positions of one or more of the BT slots within the BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

5. The device of claim 3 wherein the BT radio module refrains from advancing or retarding the master clock signal for synchronization with the frame sync pulses when a time difference between a subsequent frame sync pulse and one or more of the synchronization reference points is less than a predetermined value.

6. The device of claim 5 wherein the BT radio module re-calculates the first and second time difference in response to receipt of a subsequent frame sync pulse and continues to either advance or retard the master clock signal by the predetermined step size until substantial synchronization of the synchronization reference points and a subsequent frame sync pulse is achieved.

7. The device of claim 1 wherein the BT device adjusts a slave clock within the BT device in response to receipt of the BT transmission from the BT radio module.

8. The device of claim 7 wherein the wireless network radio module is a Worldwide Interoperability for Microwave Access (WiMax) radio module and establishes the OFDMA wireless network link for communicating within OFDMA frames with a WiMax base station,

wherein the WiMax module generates a frame sync pulse for one or more OFDMA frames, each frame sync pulse being relevant to a beginning of one of the OFDMA frames, and

wherein a duration of each of the OFDMA frames is an integer multiple of the BT slots.

9. The device of claim 8 wherein the BT radio module establishes a BT synchronous connection oriented (SCO) link with the BT device, and

wherein the BT radio module adjusts the master clock signal for synchronous communications over the BT SCO link by the predetermined step size before each subsequent BT transmission over the BT SCO link until substantial synchronization of the synchronization reference points and the frame sync pulses is achieved.

10. The device of claim 9 wherein the WiMax radio module comprises a coexist controller to generate the frame sync pulses and to generate a wireless network active signal when the wireless network radio module is either transmitting or receiving,

wherein in response to receipt of the wireless network active signal, the BT radio module refrains from transmitting to the BT device or interrupts a current BT transmission to the BT device.

11. The device of claim 1 wherein the BT radio module establishes the BT link with the BT device and the wireless network radio module establishes the wireless network link with a wireless network base station.

12. The device of claim 11 wherein the BT device comprises a BT headset and wherein the multi-radio communication device relays voice packets between the BT device and the wireless network base station, and

wherein the wireless network base station communicates the voice packet as a Voice-over-Internet-Protocol (VoIP) packet with a service network.

13. A method of synchronizing wireless network and Bluetooth (BT) communications to enable coexistence therebetween comprising:

generating, by a wireless-network radio module, a frame sync pulse associated with a frame for wireless network communications over an OFDMA wireless network link; and

providing the frame sync pulse to a Bluetooth (BT) radio module,

wherein when a BT link is established prior to the wireless network link, the method further comprises;

adjusting, by the BT radio module, a master clock signal for communicating over the BT link by a predetermined step size before each first BT transmission of a BT interval in response to the frame sync pulse to shift positions of BT slots of the BT interval until a time difference between subsequent frame sync pulses and a synchronization reference point of one of the BT slots of the BT interval is reduced to less than a predetermined value,

wherein the predetermined step size is no greater than a maximum value that the BT device is configured to adjust its slave clock to allow the BT link to be maintained with the BT device during the adjustment of the master clock signal, and

wherein when the BT link is not established prior to the wireless network link, the method further comprises establishing, by the BT radio module, the BT link to be initially synchronized with the wireless network link.

14. The method of claim 13 further comprising:

calculating a first time difference between the frame sync pulse and a prior synchronization reference point; and

calculating a second time difference between the frame sync pulse and a subsequent synchronization reference point,

wherein when the first time difference is less than or equal to the second time difference, the method further comprises retarding a master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

15. The method of claim 14 wherein when the first time difference is greater than the second time difference, the method further comprises advancing the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and the frame sync pulses.

16. The method of claim 15 wherein when the first time difference is less than or equal to the second time difference, the master clock signal is retarded by providing a positive offset to shift positions of one or more of the BT slots within a BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse, and

wherein when the first time difference is greater than the second time difference, the master clock signal is advanced by providing a negative offset to shift positions of one or more of the BT slots within the BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

17. The method of claim 13 wherein the BT device adjusts a slave clock within the BT device in response to receipt of the BT transmission from the BT radio module.

18. A multi-radio wireless communication system comprising:

a Bluetooth (BT) radio module to establish a BT synchronous connection oriented (SCO) link; and

a WiMax radio module to establish an OFDMA communication link with a WiMax base station using one or more antennas and to generate a frame sync pulse associated with OFDMA frames communicated over the OFDMA communication link, the WiMax radio module configured to provide the frame sync pulse to the BT radio module,

wherein when the BT SCO link is established prior to the OFDMA communication link, the BT radio module is configured to adjust a master clock signal by a predetermined step size before each first BT transmission of a BT interval of the BT SCO link in response to the frame sync pulse to shift positions of BT slots of the BT interval until a time difference between subsequent frame sync pulses and a synchronization reference point of one of the BT slots of the BT interval is reduced to less than a predetermined value,

wherein the predetermined step size is no greater than a maximum value that the BT device is configured to adjust its slave clock to allow the BT SCO link to be maintained with the BT device during the adjustment of the master clock signal, and

wherein when the BT SCO link is not established prior to the OFDMA communication link, the BT radio module establishes the BT SCO link to be initially synchronized with the OFDMA communication link.

19. The system of claim 18 wherein the BT radio module calculates a first time difference between the frame sync pulse and a prior synchronization reference point and calculates a second time difference between the frame sync pulse and a subsequent synchronization reference point, and

wherein when the first time difference is less than or equal to the second time difference, the BT radio module retards the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

20. The system of claim 19 wherein when the first time difference is greater than the second time difference, the BT radio module advances the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and the frame sync pulses,

wherein when the first time difference is less than or equal to the second time difference, the BT radio module retards the master clock signal by providing a positive offset to shift positions of one or more of the BT slots within a BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse, and

wherein when the first time difference is greater than the second time difference, the BT radio module advances the master clock signal by providing a negative offset to shift positions of one or more of the BT slots within the BT interval by the predetermined step size to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

21. A computer-readable storage device comprising instructions, which when implemented by one or more processors, synchronize wireless network and Bluetooth (BT) communications to enable coexistence therebetween, the one or more processors to:

generate a frame sync pulse associated with a frame for wireless network communications over an OFDMA wireless network link; and

provide the frame sync pulse to a Bluetooth (BT) radio module,

wherein when a BT link is established prior to the wireless network link, the one or more processors are further configured to cause the BT radio module to adjust a master clock signal for communicating over the BT link by a predetermined step size before each first BT transmission of a BT interval in response to the frame sync pulse to shift positions of BT slots of the BT interval until a time difference between subsequent frame sync pulses and a synchronization reference point of one of the BT slots of the BT interval is reduced to less than a predetermined value,

wherein the predetermined step size is no greater than a maximum value that the BT device is configured to adjust its slave clock to allow the BT link to be maintained with the BT device during the adjustment of the master clock signal, and

wherein when the BT link is not established prior to the wireless network link, the one or more processors are further configured to cause the BT radio module to establish the BT link to be initially synchronized with the wireless network link.

22. The computer-readable storage device of claim 21 wherein the instructions, when further implemented cause the one or more possessors to:

calculate a first time difference between the frame sync pulse and a prior synchronization reference point; and

calculate a second time difference between the frame sync pulse and a subsequent synchronization reference point,

wherein when the first time difference is less than or equal to the second time difference, the instructions further cause the one or more possessors to retard a master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and a subsequent frame sync pulse.

23. The computer-readable storage device of claim 22 wherein when the first time difference is greater than the second time difference, the instructions further cause the one or more possessors to advance the master clock signal by the predetermined step size to shift the BT slots to achieve substantial synchronization of the synchronization reference points and the frame sync pulses.