PHYSICAL LAYER REPEATER WITH ROAMING SUPPORT BASED ON MULTIPLE IDENTIFIERS

• US 20100165910A1
• Filed: 05/31/2007
• Published: 07/01/2010
• Est. Priority Date: 05/31/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Proctor, James A., Mathews, Mark, Galney, Kenneth M., Lamont, Lawrence W.
• Granted Patent: US 8,363,590 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/15528 Control of operation parameters of a relay station to exploit the physical medium
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

An exemplary method (600, 700) and apparatus (800) are provided for generating a modified protocol message (414, 423a, 423h, 424). In some embodiments, a physical layer repeater conducts a repeating operation including receiving a modified protocol signal on a first channel and retransmitting a modified version of the modified protocol signal on a second channel. An exemplary physical layer repeater can include a transceiver (810), a baseband modem (822), and a processor (821) configured to demodulate the modified protocol signal to obtain a first identifier and a first channel identifier and a unique identifier in a modified portion of the signal. The unique identifier and a second channel identifier are retransmitted in a modified version of the signal on the second channel.

Claims

1. A physical layer repeater for conducting a physical layer repeating operation, the physical layer repeating operation including receiving a modified protocol signal on a first channel associated with an access point (AP), and retransmitting a modified version of the modified protocol signal on a second channel different from the first channel, the physical layer repeater comprising:

a transceiver,

a baseband modulator/demodulator (modem) coupled to the transceiver; and

a processor coupled the transceiver and the baseband modem, the processor configured to;

demodulate the modified protocol signal to obtain a first identifier associated with the AP and a first channel identifier associated with the first channel in an unmodified portion thereof and a unique identifier in a modified portion thereof; and

retransmit the unique identifier and a second channel identifier associated with the second channel in a modified version of the modified protocol signal on the second channel and prevent the retransmission of the first identifier and the first channel identifier on the second channel.

2. The physical layer repeater according to claim 1, wherein the modified protocol signal includes a beacon frame.

3. The physical layer repeater according to claim 1, wherein the processor is further configured to cause the AP to transmit the modified protocol signal by notifying the AP that the physical layer repeater can process the modified protocol signal.

4. The physical layer repeater according to claim 1, wherein the processor is further configured to transmit a probe request signal so as to cause the AP to transmit the modified protocol signal.

5. The physical layer repeater according to claim 1, wherein the modified protocol signal includes a beacon frame and wherein the unique identifier includes a unique BSSID_repeater.

6. The physical layer repeater according to claim 5, wherein the modified protocol signal includes a beacon frame and wherein the modified portion includes an invalid information element (IE).

7. The physical layer repeater according to claim 1, wherein the modified protocol signal includes a beacon frame and wherein the modified portion includes a unique BSSID_repeater and an invalid information element (IE).

8. The physical layer repeater according to claim 1, wherein the first identifier includes a BSSID associated with the AP and an information element (IE) associated with the first channel.

9. The physical layer repeater according to claim 1, wherein the unique identifier includes a unique BSSID_repeater.

10. The physical layer repeater according to claim 1, wherein the modified protocol signal includes a probe response and wherein the modified portion includes a unique BSSID_repeater.

11. The physical layer repeater according to claim 10, wherein the modified protocol signal includes a probe response and wherein the modified portion includes an invalid information element (IE).

12. The physical layer repeater according to claim 1, wherein the modified protocol signal includes a probe response and wherein the modified portion includes a unique BSSID_repeater and an invalid information element (IE).

13. A method for controlling a wireless network operating in accordance with a protocol, the method comprising:

transmitting a protocol message on a first channel from a node in the network, a modified portion of the protocol message modified so as to deviate from the protocol, the protocol message containing, in an unmodified portion, control information and a first identifier associated with the node and a first channel identifier associated with the first channel and, in the modified portion, a second identifier associated with a unique identifier assigned by the first node for repeating by a repeater node repeating the control information on a second channel; and

receiving the protocol message on the first channel at the repeater node and retransmitting a modified version of the protocol message on the second channel different from the first channel such that the modified version of the protocol message contains the second identifier and a second channel identifier associated with the second channel,

wherein the modified version of the protocol message does not contain the first identifier associated with the node and the first channel identifier associated with the first channel.

14. The method according to claim 13, wherein the protocol message includes one of a beacon frame and a probe response.

15. The method according to claim 13, further comprising notifying the node that the repeater node can process the protocol message so as to cause the node to transmit the protocol message.

16. The method according to claim 13, wherein the second identifier in the modified portion of the protocol message includes a unique BSSID_repeater.

17. The method according to claim 13, wherein the first identifier includes a BSSID associated with the AP and an information element (IE) associated with the first channel.

18. The method according to claim 13, wherein the modified portion of the protocol message includes an invalid information element (IE).

19. The method according to claim 13, wherein:

the modified portion of the protocol message includes an invalid information element (IE); and

the repeater node detects the invalid IE and is thereby notified that the node is configured to transmit the modified portion of the protocol message.

20. The method according to claim 13, wherein the protocol includes an 802.11 protocol.

21. A method for generating a modified protocol message for controlling a repeating operation by a repeating node in a wireless network operating in accordance with a protocol, the modified protocol message including a modified portion and an unmodified portion, the method comprising:

forming the unmodified portion of the modified protocol message to contain a first identifier associated with a first node and a first channel identifier associated with a first channel; and

forming the modified portion of the modified protocol message such that the modified protocol message deviates from the protocol, the modified portion containing a unique identifier and a modified information element (IE).

22. The method according to claim 21, further comprising forming a modified version of the modified protocol message for retransmission during the repeating operation, the modified version including the unique identifier and a second channel identifier associated with a second channel used by the repeating node, the modified version excluding the first identifier and the first channel identifier.

23. The method according to claim 21, wherein the modified protocol message is formed if a request is received at the first node indicating that the repeating node can process the modified protocol message.

24. The method according to claim 21, wherein the repeating node is informed that the first node can send the modified protocol message by detecting the modified IE.

25. The method according to claim 21, wherein the modified protocol message includes a modified beacon frame message.

26. The method according to claim 21, wherein the modified protocol message includes a modified probe response message.

27. The method according to claim 21, wherein the first node includes an access point (AP).

28. The method according to claim 22, wherein the protocol includes an 802.11 protocol.

29. A method for extending the range of a wireless local area network (WLAN), the WLAN including an access point (AP) connected to a wide area network, the AP communicating with at least one client unit using a protocol, the AP identifying which of at least two available frequencies is chosen for transmission in a first control parameter transmitted in a first protocol message and identifying additional information in a second control parameter transmitted in a second protocol message associated with the protocol, the method comprising:

setting the first control parameter transmitted by the AP so that the chosen one of the at least two available frequencies corresponds to an identifier associated with the AP and a first channel upon which the first protocol message is transmitted from the AP,

setting the second control parameter transmitted by the AP in the second protocol message transmitted on the first channel to include a unique identifier and a second channel of the at least two available frequencies that does not correspond to the first channel,

translating the second protocol message transmitted from the AP on the first channel and retransmitting the second protocol message on the second channel to the client unit.

30. The method of claim 29, further comprising:

providing an indication by the AP of a capability to set the second control parameter, and

receiving from the AP information associated with the second channel from a repeater.

31. The method of claim 30, wherein the receiving from the AP includes receiving a probe request from the repeater after the repeater has selected the second channel.