Techniques to improve co-existence among multiple radios
Techniques are described that can be used to permit coexistence of different radios. Preambles of frames from a first radio are detected. If the preambles occur within a prescribed period of one another, then a frame synchronization signal is transmitted. Based on the timing of the frame synchronization signal, a second radio adjusts the timing of transmit and receive time slots.
1. A method performed by a wireless communications device, the method comprising:
requesting no transmission by a first radio for a first type of wireless communication during a first time region; and
selectively adjusting a beginning of a time slot of a frame transmitted by a second radio based on one or more preambles of frames from a third radio for a third type of wireless communication while permitting simultaneous transmission of second and third radio frames, and the second radio providing a second type of wireless communication.
2. The method of claim 1 , wherein the first radio comprises a WLAN transceiver, the second radio comprises a WPAN transceiver, and the third radio comprises a WWAN transceiver.
3. The method of claim 1 , wherein the requesting no transmission comprises permitting transmission of second and third radios during the first time region.
4. The method of claim 1 , further comprising:
requesting no transmission by the third radio during a second time region and permitting transmission by the first radio during the second time region.
5. The method of claim 1 , wherein the selectively adjusting a beginning of a time slot of a frame comprises:
detecting a frame boundary of a frame from the third radio.
6. The method of claim 5 , wherein the detecting a frame boundary comprises:
detecting N preambles, where the period between the N preambles equals a period of the third radio frame, wherein N is at least 2.
7. The method of claim 1 , wherein selectively adjusting a beginning of a time slot of a frame comprises:
generating a frame synchronization signal and
aligning a portion of the time slot of the frame with a portion of the frame synchronization signal, the frame synchronization signal delaying a start of the time slot.
8. The method of claim 7 , wherein the generating a frame synchronization signal comprises determining offset and period parameters of the frame synchronization signal.
9. An apparatus comprising:
a first radio for a first type of wireless communication;
a second radio for a second type of wireless communication;
a third radio for a third type of wireless communication; and
control logic to:
request no transmission by the second radio during a first time region and
selectively adjust a time slot of at least one frame transmitted by the third radio based on one or more preambles of frames of the first radio while permitting simultaneous transmission of first and third radio frames.
10. The apparatus of claim 9 , wherein the first radio comprises a WWAN radio, the second radio comprises a WLAN radio, and the third radio comprises a WPAN radio.
11. The apparatus of claim 9 , wherein to request no transmission is to permit transmission by the first and third radios during the first time region.
12. The apparatus of claim 9 , wherein the control logic to selectively adjust is to detect a frame boundary of a frame of the first radio.
13. The apparatus of claim 12 , wherein the control logic to detect a frame boundary is to detect N preambles, where the period between the N preambles equals a period of the frame of the first radio, wherein N is at least 2.
14. The apparatus of claim 9 , wherein the control logic to selectively adjust a beginning of a time slot of a frame transmitted by the third radio is to:
generate a frame synchronization signal and
align a portion of at least one time slot with a portion of the frame synchronization signal.
15. The apparatus of claim 14 , wherein the control logic to generate a frame synchronization signal is to determine offset and period parameters of the frame synchronization signal.
16. A system comprising:
a first radio for WWAN wireless communication;
a second radio for WLAN wireless communication;
a third radio for WPAN wireless communication;
at least one antenna communicatively coupled to one of the first, second, and third radios; and
control logic to:
request no transmission by the second radio during a first time region and
selectively adjust a beginning of a time slot of a frame transmitted by the third radio based on one or more preambles of frames of the first radio while permitting simultaneous transmission by the first and third radios.
17. The system of claim 16 , wherein the control logic to selectively adjust is to detect N preambles, wherein a period between the N preambles equals a period of the first radio frame and wherein N is at least 2.
18. The system of claim 16 , wherein the control logic to selectively adjust a beginning of a time slot is to:
generate a frame synchronization signal and
align a portion of at least one time slot with a portion of the frame synchronization signal.
19. The system of claim 18 , wherein the control logic to generate a frame synchronization signal is to determine offset and period parameters of the frame synchronization signal.
20. The method of claim 1 , wherein the third radio performs the requesting and the adjusting.
21. The method of claim 7 , wherein the portion comprises a beginning of a receive interval.
22. The apparatus of claim 9 , wherein the first radio initiates use of the control logic.
23. The system of claim 16 , wherein the first radio initiates use of the control logic.