Coexistent bluetooth and wireless local area networks in a multimode terminal and method thereof

• US 20060292986A1
• Filed: 06/27/2005
• Published: 12/28/2006
• Est. Priority Date: 06/27/2005
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Peleg, Eyal, Sherman, Itay, Bitran, Yigal, Shoemake, Matthew B., Ophir, Lior
• Application Number:
  US11/167,374
• Publication Number:
  US 20060292986A1
• Time in Patent Office: Days
• US Class Current: 455/41.2
• CPC Class Codes: H04M 2250/02 including a Bluetooth interface
• CPC Class Codes: H04M 2250/06 including a wireless LAN interface
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• 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

The present invention generally to a multimode terminal including a wireless local area network (WLAN) system and a Bluetooth system that avoids radio interference between the two systems by collaborative coexistence methods that include time-sharing, combined frequency and time-sharing, and forward looking combined frequency and time-sharing between the WLAN system and the Bluetooth system. The coexistent multimode terminal and the method of coexistence provide WLAN transmission/receptions that are not impacted when there is no Bluetooth traffic, Bluetooth transmissions/receptions that are not impacted when there is no WLAN traffic, Bluetooth and WLAN transmissions/receptions that are provided fair access to the medium when both Bluetooth and WLAN traffic are present, and high priority Bluetooth traffic, for example, voice traffic, that has priority over non-high WLAN traffic.

Claims

1. A coexistent multimode terminal, comprising:

a wireless local area network (WLAN) system including a coexistence master;

a Bluetooth system;

a Bluetooth radio shut-down signal output from the coexistence master to the Bluetooth system;

a first timing signal output from the Bluetooth system to the coexistence master, the first timing signal indicating transmission/reception by the Bluetooth system; and

a first algorithm residing in the coexistence master, such that when WLAN data is available for transmission or the WLAN system recognizes an address match, the first algorithm causes the coexistence master to output the Bluetooth radio shut-down signal after the first timing signal from the Bluetooth system is deasserted.

2. The coexistent multimode terminal of claim 1, further comprising:

a second timing signal output from the Bluetooth system to the coexistence master, the second timing signal indicating that transmission/reception of high priority data, including voice data, is about to occur from the Bluetooth system; and

a second algorithm logically linked to the first algorithm, such that upon receiving the second timing signal, the second algorithm causes a WLAN transmission/reception to be terminated and the Bluetooth radio shut-down signal to be deasserted.

26. The coexistent multimode terminal of claim 1, further comprising:

a single antenna connected to a splitter/switch connected to a WLAN system'"'"'s transceiver and a Bluetooth system'"'"'s transceiver, wherein

the WLAN system'"'"'s transceiver and the Bluetooth system'"'"'s transceiver are electrically isolated from one another by the splitter/switch by more than 15 dB.

27. The coexistent multimode terminal of claim 1, further comprising:

a single antenna including a first portion that transmits/receives a vertically polarized component of a radio signal and a second portion that transmits/receives a horizontally polarized component of the radio signal, wherein

a WLAN system'"'"'s transceiver is connected to the second portion and a Bluetooth system'"'"'s transceiver is connected to the first portion of the single antenna, and

the WLAN system'"'"'s transceiver and the Bluetooth system'"'"'s transceiver are electrically isolated from one another by the first portion and the second portion of the single antenna by more than 15 dB.

3. A method of coexistence for a multimode terminal, comprising:

determining by a coexistent WLAN system, whether WLAN data is to be transmitted or the coexistent WLAN system recognizes an address match;

determining whether a Bluetooth system is transmitting/receiving by accessing a first timing signal from the Bluetooth system to the coexistent WLAN system;

if the Bluetooth system is transmitting/receiving, then allowing a Bluetooth transmission/reception to complete, before disabling Bluetooth transmission by asserting a Bluetooth radio shut-down signal from the coexistent WLAN system; and

if the Bluetooth system is not transmitting/receiving, then disabling the Bluetooth transmission.

4. The method of coexistence for a multimode terminal of claim 3, further comprising:

after the Bluetooth transmission/reception is completed and the Bluetooth transmission is disabled, allowing the coexistent WLAN system to transmit/receive for up to T_WLAN ms; and

after the transmission/reception for up to T_WLAN ms is completed, enabling the Bluetooth transmission/reception for T_BT ms by deasserting the Bluetooth radio shut-down signal from the coexistent WLAN system.

5. The method of coexistence for a multimode terminal of claim 3, further comprising:

after determining WLAN data is to be transmitted or the coexistent WLAN system recognizes an address match, and the Bluetooth transmission is disabled, then allowing the WLAN data to be transmitted or the address match to proceed to reception.

6. The method of coexistence for a multimode terminal of claim 5, further comprising:

after allowing the WLAN data to be transmitted or the address match to proceed to reception, then determining whether a Bluetooth transmission was attempted during the WLAN data transmission or reception.

7. The method of coexistence for a multimode terminal of claim 6, further comprising:

if the Bluetooth transmission was attempted during the WLAN data transmission or reception, then waiting for the Bluetooth transmission to internally complete within the Bluetooth system; and

subsequently enabling Bluetooth transmission.

8. The method of coexistence for a multimode terminal of claim 6, further comprising:

if the Bluetooth transmission was not attempted during the WLAN data transmission or reception, then enabling Bluetooth transmission.

9. The method of coexistence for a multimode terminal of claim 3, further comprising:

asserting a high priority data timing signal from the Bluetooth system to the coexistent WLAN system, the high priority data timing signal indicating that transmission/reception of high priority data, including voice data, is about to occur from the Bluetooth system; and

then terminating and disabling a coexistent WLAN transmission/reception.

10. A coexistent multimode terminal, comprising:

a wireless local area network (WLAN) system including a coexistence master;

a Bluetooth system;

a Bluetooth radio shut-down signal output from the coexistence master to the Bluetooth system;

data, including an interference frequency band, that is output from the WLAN system to the Bluetooth system;

a first timing signal output from the Bluetooth system to the coexistence master, the first timing signal indicating transmission/reception by the Bluetooth system, wherein

the first timing signal is output only when a frequency of transmission for the Bluetooth system falls within the interference frequency band; and

a first algorithm residing in the coexistence master, such that when WLAN data is available for transmission or the WLAN system recognizes an address match, the first algorithm causes the coexistence master to output the Bluetooth radio shut-down signal after the first timing signal from the Bluetooth system is deasserted.

11. The coexistent multimode terminal of claim 10 further comprising:

a second timing signal output from the Bluetooth system to the coexistence master, the second timing signal indicating that transmission/reception of high priority data, including voice data, is about to occur from the Bluetooth system; and

a second algorithm logically linked to the first algorithm, such that upon receiving the second timing signal, the second algorithm causes a WLAN transmission/reception to be terminated and the Bluetooth radio shut-down signal to be deasserted.

12. A method of coexistence for a multimode terminal, comprising:

outputting from a coexistent WLAN system to a Bluetooth system, data including an interference frequency band;

determining by the coexistent WLAN system, whether WLAN data is to be transmitted or the coexistent WLAN system recognizes an address match;

determining whether a Bluetooth system is transmitting/receiving in the interference frequency band by accessing a first timing signal from the Bluetooth system to the coexistent WLAN system, wherein

the first timing signal is output from the Bluetooth system only when a frequency of transmission of the Bluetooth system falls within the interference frequency band;

if the Bluetooth system is transmitting/receiving in the interference frequency band, then allowing a Bluetooth transmission/reception to complete, before disabling Bluetooth transmission by asserting a Bluetooth radio shut-down signal from the coexistent WLAN system; and

if the Bluetooth system is not transmitting/receiving in the interference frequency band, then disabling the Bluetooth transmission.

13. The method of coexistence for a multimode terminal of claim 12, further comprising:

asserting a high priority data timing signal from the Bluetooth system to the coexistent WLAN system, the high priority data timing signal indicating that transmission/reception of high priority data, including voice data, is about to occur in the interference frequency band from the Bluetooth system; and

then terminating and disabling a coexistent WLAN transmission/reception.

14. A coexistent multimode terminal, comprising:

a wireless local area network (WLAN) system;

a Bluetooth system, wherein

the WLAN system includes a coexistence master that includes information of a transmission/reception frequency of the WLAN system and a duplicate of the Bluetooth system'"'"'s frequency hopping scheduler;

a Bluetooth radio shut-down signal output from the coexistence master to the Bluetooth system;

a first timing signal output from the Bluetooth system to the coexistence master, the first timing signal indicating transmission/reception by the Bluetooth system, wherein

the first timing signal is output only when a frequency of transmission for the Bluetooth system interferes with the transmission/reception frequency of the WLAN system;

a clock signal and a reset signal output from the Bluetooth system to the coexistence master for synchronizing the coexistence master'"'"'s duplicate of the Bluetooth system'"'"'s frequency hopping scheduler with the Bluetooth frequency hopping scheduler;

voice link parameter information that is transmitted ahead of time to the coexistence master; and

a first algorithm residing in the coexistence master, such that when WLAN data is available for transmission or the WLAN system recognizes an address match, the first algorithm causes the coexistence master to output the Bluetooth radio shut-down signal after the first timing signal from the Bluetooth system is deasserted.

15. The coexistent multimode terminal of claim 14, further comprising:

a serial output line from the WLAN system to the Bluetooth system that outputs interference frequency band data.

16. The coexistent multimode terminal of claim 14, further comprising:

a second timing signal output from the Bluetooth system to the coexistence master, the second timing signal indicating that transmission/reception of high priority data, corresponding to the voice link parameter information, is about to occur from the Bluetooth system; and

a second algorithm logically linked to the first algorithm, such that upon receiving the second timing signal, the second algorithm causes a WLAN transmission/reception to be terminated and the Bluetooth radio shut-down signal to be deasserted.

18. The method of coexistence for a multimode terminal of claim 16, further comprising:

outputting interference frequency band data from the coexistent WLAN system to the Bluetooth system.

19. The method of coexistence for a multimode terminal of claim 16, further comprising:

asserting a high priority data timing signal from the Bluetooth system to the coexistent WLAN system, the high priority data timing signal indicating that transmission/reception of high priority data, corresponding to the voice link parameter information, is about to occur in the interference frequency band from the Bluetooth system; and

then terminating and disabling a coexistent WLAN transmission/reception.

17. A method of coexistence for a multimode terminal, comprising:

synchronizing a duplicate of a Bluetooth system'"'"'s frequency hopping scheduler, residing in a coexistence master of a WLAN system, with the Bluetooth system'"'"'s frequency hopping scheduler by clock and reset signal from the Bluetooth system;

communicating, ahead of time, Bluetooth voice link parameter information to the coexistence master;

determining by the coexistent WLAN system, whether WLAN data is to be transmitted or the WLAN system recognizes an address match;

determining by the coexistent WLAN system, whether the Bluetooth system is transmitting/receiving in a frequency band, which overlaps a transmission frequency band of the coexistent WLAN system, by accessing a first timing signal from the Bluetooth system to the coexistent WLAN system, wherein

the first timing signal is output from the Bluetooth system only when the frequency band of transmission/reception of the Bluetooth system overlaps the transmission frequency band of the coexistent WLAN system;

if the Bluetooth system is transmitting/receiving in the transmission frequency band of the coexistent WLAN system, then allowing a Bluetooth transmission/reception to complete, before disabling Bluetooth transmission by asserting a Bluetooth radio shut-down signal from the coexistent WLAN system; and

if the Bluetooth system is not transmitting/receiving in the transmission frequency band of the coexistent WLAN system, then disabling the Bluetooth transmission.

20. A coexistent multimode terminal, comprising:

a wireless local area network (WLAN) system;

a Bluetooth system;

a Bluetooth radio shut-down signal output from the Bluetooth system;

a first timing signal output from the Bluetooth system to the WLAN system, the first timing signal indicating transmission/reception by the Bluetooth system, wherein

the first timing signal is output only when a frequency of transmission for the Bluetooth system interferes with the transmission/reception frequency of the WLAN system;

a clock signal and a reset signal output from the Bluetooth system to the WLAN system for synchronizing the WLAN system to Bluetooth slot boundaries;

data link parameter information, including a future hop sequence, that is transmitted ahead of time from the Bluetooth system to the WLAN system; and

a first algorithm residing in the WLAN system, such that when WLAN data is available for transmission or the WLAN system recognizes an address match, the first algorithm causes the WLAN system to output the Bluetooth radio shut-down signal after the first timing signal from the Bluetooth system is deasserted.

21. The coexistent multimode terminal of claim 20, further comprising:

a serial output line from the WLAN system to the Bluetooth system that outputs interference frequency band data.

22. The coexistent multimode terminal of claim 20, further comprising:

a second timing signal output from the Bluetooth system to the WLAN, the second timing signal indicating that transmission/reception of high priority data, corresponding to the data link parameter information, is about to occur from the Bluetooth system; and

a second algorithm logically linked to the first algorithm, such that upon receiving the second timing signal, the second algorithm causes a WLAN transmission/reception to be terminated and the Bluetooth radio shut-down signal to be deasserted.

23. A method of coexistence for a multimode terminal, comprising:

synchronizing a WLAN system to slot boundaries of a Bluetooth system by clock and reset signals from the Bluetooth system;

communicating, ahead of time, data voice link parameter information, including a future hop sequence, from the Bluetooth system to the WLAN system;

determining by the WLAN system, whether WLAN data is to be transmitted or the WLAN system recognizes an address match;

determining by the WLAN system, whether the Bluetooth system is transmitting/receiving in a frequency band, which overlaps a transmission frequency band of the WLAN system, by accessing a first timing signal from the Bluetooth system to the WLAN system, wherein

the first timing signal is output from the Bluetooth system only when the frequency band of transmission/reception of the Bluetooth system overlaps the transmission frequency band of the WLAN system;

if the Bluetooth system is transmitting/receiving in the transmission frequency band of the WLAN system, then allowing a Bluetooth transmission/reception to complete, before disabling Bluetooth transmission by asserting a Bluetooth radio shut-down signal from the WLAN system; and

if the Bluetooth system is not transmitting/receiving in the transmission frequency band of the WLAN system, then disabling the Bluetooth transmission.

24. The method of coexistence for a multimode terminal of claim 23, further comprising:

outputting interference frequency band data from the WLAN system to the Bluetooth system.

25. The method of coexistence for a multimode terminal of claim 23, further comprising:

asserting a high priority data timing signal from the Bluetooth system to the WLAN system, the high priority data timing signal indicating that transmission/reception of high priority data, corresponding to the data link parameter information, is about to occur in the interference frequency band from the Bluetooth system; and

then terminating and disabling a WLAN transmission/reception.