Reconfiguration of a communication system

• US 8,189,538 B2
• Filed: 01/29/2010
• Issued: 05/29/2012
• Est. Priority Date: 01/11/2002
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Bims, Harry
• Primary Examiner(s): Lai, Andrew
• Application Number:
  US12/696,804
• Publication Number:
  US 20100128655A1
• Time in Patent Office: 851 Days
• Field of Search: 370/252, 370/315, 370/331, 370/332, 370/335, 370/338, 455/276.1, 455436-438, 455/440, 455/442, 709/217, 709/225, 709/238, 709/250, 398/110, 398/103, 398/118, 398/127
• US Class Current: 370/332
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 40/00 Communication routing or communication path finding
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

A communication system is described. In one embodiment, the communication system comprises a mobile station having a transmitter to transmit packets wirelessly according to a protocol and multiple repeaters communicably coupled with the mobile station. Each of the plurality of repeaters receives one or more packets of the wirelessly transmitted packets from the mobile station. Each of the repeaters receives an indication of which of the wirelessly transmitted packets were received without errors by other repeaters and a received signal strength for those packets. The communication system also includes a switch coupled to the repeaters. Each of the repeaters forwards to the switch each packet of the wirelessly transmitted packets that each repeater had received without errors at a received signal strength higher than any other repeater.

Claims

1. A routing system for enhancing mobility of a mobile station, comprising:

a switch having a switch media access control (MAC) sublayer, the switch MAC sublayer being configured to perform a first portion of a wireless communication protocol;

a first repeater having a first repeater MAC sublayer, the first repeater MAC sublayer being configured to perform a second portion of the wireless communication protocol, the switch MAC sublayer and the first repeater MAC sublayer functionally cooperating to form a first MAC layer in a first distributed manner; and

a second repeater having a second repeater MAC sublayer, the switch MAC sublayer and the second repeater MAC sublayer functionally cooperating to form a second MAC layer in a second distributed manner,

wherein the switch MAC sublayer is further configured to handoff the mobile station from the first MAC layer to the second MAC layer when the switch determines a first received signal strength of a first packet received by the first repeater is less than a second received signal strength of a second packet received by the second repeater, the first packet being a duplicate of the second packet.

2. The routing system of claim 1, wherein the switch comprises:

a first port configured to communicate with the first repeater; and

a second port configured to communicate with the second repeater,

wherein the switch MAC sublayer is further configured to switch from the first port to the second port to communicate with the mobile station when the first received signal strength is less than the second received signal strength.

3. The routing system of claim 1, wherein the switch is further configured to handoff the mobile station from the second repeater MAC sublayer to the first repeater MAC sublayer when the second received signal strength is less than the first received signal strength.

4. The routing system of claim 1, wherein mobility provisions of the wireless communications protocol are ignored.

5. The routing system of claim 1, wherein the switch is further configured to monitor the first received signal strength and the second received signal strength, to determine that the mobile station is closer to the second repeater when the first received signal strength is less than the second received signal strength, and to handoff the mobile station from the first MAC layer to the second MAC layer when the mobile station is closer to the second repeater.

6. The routing system of claim 5, wherein the switch is further configured to store a table including an indication that the mobile station is closer to the first repeater,

wherein the switch is further configured to update the indication to indicate the mobile station is closer to the second repeater when the switch determines the mobile station is closer to the second repeater.

7. The routing system of claim 1, wherein the switch MAC sublayer is further configured to associate the first repeater with the mobile station.

8. The routing system of claim 1, wherein the switch MAC sublayer is configured to associate the mobile station with the second repeater when the first received signal strength is less than the second received signal strength.

9. The routing system of claim 8, wherein the switch MAC sublayer is further configured to disassociate the mobile station with the first repeater when the first received signal strength is less than the second received signal strength.

32. The routing system of claim 1, wherein the first and the second MAC layers are specified by the wireless communication protocol.

33. The routing system of claim 1, wherein the wireless communication protocol is an 802.11 communications protocol.

10. A routing method for enhancing mobility of a mobile station, comprising:

(a) communicating with the mobile station using a first repeater media access control (MAC) sublayer of a first repeater, the first repeater being communicatively coupled to a switch MAC sublayer of a switch, the switch MAC sublayer and the first repeater MAC sublayer functionally cooperating to form a first MAC layer in a first distributed manner, the switch MAC sublayer and the first repeater MAC sublayer being configured to perform a first portion and a second portion, respectively, of a wireless communication protocol; and

(b) handing off the mobile station from the first MAC layer to a second MAC layer when the switch determines a first received signal strength of a first packet received by the first repeater is less than a second received signal strength of a second packet received by the second repeater, the first packet being a duplicate of the second packet, the switch MAC sublayer and a second repeater MAC sublayer of a second repeater functionally cooperating to form the second MAC layer in a second distributed manner.

11. The method of claim 10, wherein step (b) comprises:

(b)(i) switching from a first port of the switch to a second port of the switch to handoff the mobile station from the first MAC sublayer to the second MAC sublayer.

12. The method of claim 10, wherein step (b) comprises:

(b)(i) using the switch MAC sublayer to handoff the mobile station from the first repeater MAC sublayer to the second repeater MAC sublayer.

13. The method of claim 10, wherein mobility provisions of the wireless communications protocol are ignored.

14. The method of claim 10, wherein step (b) comprises:

(b)(i) monitoring, by the switch, the first received signal strength and the second received signal strength; and

(b)(ii) determining, by the switch, that the mobile station is closer to the second repeater when the first received signal strength is less than the second received signal strength.

15. The method of claim 14, further comprising:

(c) indicating on a table that the mobile station is closer to the first repeater; and

(d) updating the indication to indicate the mobile station is closer to the second repeater when the switch determines the mobile station is closer to the second repeater.

16. The method of claim 10, further comprising:

(c) using the switch MAC sublayer to associate the first repeater with the mobile station.

17. The method of claim 10, further comprising:

(c) using the switch MAC sublayer to associate the mobile station with the second repeater when the first received signal strength is less than the second received signal strength.

18. The method of claim 17, further comprising:

(d) using the switch MAC sublayer to disassociate the mobile station with the first repeater when the first received signal strength is less than the second received signal strength.

19. The method of claim 17, wherein the first and the second MAC layers are specified by the wireless communication protocol.

20. The method of claim 17, a wherein the wireless communication protocol is an 802.11 communications protocol.

21. A routing system for enhancing mobility of a mobile station, comprising:

a switch having a switch media access control (MAC) sublayer, the switch MAC sublayer being configured to perform a first portion of a wireless communication protocol;

a first repeater having a first repeater MAC sublayer, the first repeater MAC sublayer being configured to perform a second portion of the wireless communication protocol, the switch MAC sublayer and the first repeater MAC sublayer functionally cooperating to form a first MAC layer in a first distributed manner, the first repeater being configured to receive a first packet from the mobile station using the first repeater MAC sublayer, the first packet being characterized by a first indicator; and

a second repeater having a second repeater MAC sublayer, the switch MAC sublayer and the second repeater MAC sublayer functionally cooperating to form a second MAC layer in a second distributed manner, the second repeater being configured to receive a second packet from the mobile station using the second repeater MAC sublayer, the second packet being a duplicate of the first packet and characterized by a second indicator,

wherein the switch MAC sublayer is configured to handoff the mobile station from the first repeater to the second repeater when the first indicator is less than the second indicator.

22. The routing system of claim 21, wherein the switch comprises:

a first port configured to communicate with the first repeater; and

a second port configured to communicate with the second repeater,

wherein the switch MAC sublayer is further configured to switch from the first port to the second port to communicate with the mobile station when the first indicator is less than the second indicator.

23. The routing system of claim 21, wherein the mobile station is closer to the second repeater when the first indicator is less than the second indicator.

24. The routing system of claim 21, wherein the first indicator and the second indicator indicate a first received signal strength indicator (RSSI) of the first packet and a second RSSI of the second packet, respectively.

25. The routing system of claim 24, wherein the switch is further configured to monitor a first received signal strength of the first packet and a second received signal strength of the second packet received by the second repeater.

26. The routing system of claim 25, wherein the switch is further configured to determine that the mobile station is closer to the second repeater when the first received signal strength is less than the second received signal strength.

27. The routing system of claim 24, wherein the switch is further configured to determine the mobile station is closer to the second repeater when the first RSSI is less than the second RSSI.

28. The routing system of claim 21, wherein the switch is further configured to store a table including an indication that the first indicator is greater than the second indicator,

wherein the switch is configured to update the indication when the first indicator is less than the second indicator.

29. The routing system of claim 21, wherein the switch MAC sublayer is configured to associate the first repeater with the mobile station.

30. The routing system of claim 29, wherein the switch MAC sublayer is configured to associate the mobile station with the second repeater when the first indicator is less than the second indicator.

31. The routing system of claim 30, wherein the switch MAC sublayer is configured to disassociate the mobile station with the first repeater when the first indicator is less than the second indicator.

34. The routing system of claim 21, wherein the first and the second MAC layers are specified by the wireless communication protocol.

35. The routing system of claim 21, wherein the wireless communication protocol is an 802.11 communications protocol.