Control message management in physical layer repeater

• US 8,885,688 B2
• Filed: 06/07/2006
• Issued: 11/11/2014
• Est. Priority Date: 10/01/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gainey, Kenneth M., Proctor, James A. Jr., Lintelman, Ross L., LaMont, Lawrence W. Jr., Puig, Carlos M.
• Primary Examiner(s): Ahn, Sam K
• Assistant Examiner(s): Wong, Linda
• Application Number:
  US11/448,155
• Publication Number:
  US 20070025486A1
• Time in Patent Office: 3,079 Days
• Field of Search: 375219-222, 375/295, 375/211, 375/214, 37524026-24027, 375/284, 375/285, 375/316, 375340-341, 375302-315, 370/282, 370/293, 370/315, 370/329, 370/432, 370/492, 370/501
• US Class Current: 375/211
• CPC Class Codes: H04B 7/15535 Control of relay amplifier gain amplifier gain control in general H03G3/00; gain control reducing self - or loop interference H04B7/15578
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

A repeater is configured to selectively generate and transmit control message packets between wireless stations on both a transmit side and a receive side of the repeater. The repeater manages and manipulates an end to end protocol of the control message packets in a manner that does not change media access control (MAC) addresses of the end to end protocol so as to achieve a network objective, such as preventing other transmitters from transmitting while the repeater repeats a signal from its receive side to its transmit side. The control message management is applicable to analog signal repeaters as well as digital repeaters, such as symbol to symbol or packet to packet repeaters, in which physical layer control message management is performed.

Claims

1. A repeater for use in a wireless local area network, comprising:

a transceiver for receiving a signal on a first frequency channel and for transmitting the signal on a second frequency channel different from the first frequency channel; and

a control message modulator/demodulator (MODEM) coupled to the transceiver for demodulating a receive control message packet on the first frequency channel and for modulating one or more transmit control message packets that are transmitted by the transceiver on the first frequency channel in response to the receive control message packet, wherein the one or more transmit control message packets each include a first portion that corresponds to an unmodified version of the receive control message packet and a second portion that is modified from a corresponding portion of the receive control message packet by deliberately introducing error so as to reduce a likelihood that the one or more transmit control message packets will be successfully decoded at a receiver.

2. The repeater according to claim 1, wherein the second portion and not the first portion of the one or more transmit control message packets transmitted on the first frequency channel is punctured so as to reserve a medium associated with the first frequency channel.

3. The repeater according to claim 2, wherein the transceiver includes an amplifier for amplifying the receive control message packet, the amplifier having an associated gain that is adjustable to enable the one or more transmit control message packets to be punctured.

4. The repeater according to claim 2, further comprising an automatic gain control apparatus coupled to the transceiver that is adjustable to enable the one or more transmit control message packets transmitted on the first frequency channel to be punctured.

5. The repeater according to claim 2, wherein the repeater comprises a regenerative frequency translating physical layer repeater, wherein the one or more transmit control message packets transmitted on the first frequency channel are punctured in the digital domain so as to reserve a medium associated with the first frequency channel.

17. The repeater of claim 1, wherein the repeater comprises a physical layer repeater for disrupting the one or more transmit control message packets transmitted by the transceiver on the first frequency channel by one of puncturing or truncating the one or more transmit control message packets.

18. The repeater of claim 1, wherein the repeater comprises one of an analog, RF and digitally sampled repeater.

19. The repeater of claim 1, wherein the repeater comprises a regenerative repeater in which the MODEM modulates the one or more transmit control message packets with unmodified packet addressing.

6. A method for selectively modifying messages in a frequency translating repeater based on a parameter of the messages, the method comprising:

searching for a preamble associated with a message received on a receive frequency channel;

decoding the received message if the preamble is detected;

generating a modified internal message that corresponds to a modified version of the received message; and

transmitting the modified internal message on both the receive frequency channel and a transmit frequency channel to prevent further activity on the receive frequency channel.

7. The method according to claim 6, further comprising puncturing a packet associated with the modified internal message transmitted on the receive frequency channel to reserve a medium associated with the receive frequency channel and to prevent further activity thereon.

8. The method according to claim 7, wherein the puncturing of a packet comprises puncturing a packet by downwardly adjusting a gain of the modified internal message transmitted on the receive frequency channel.

9. The method according to claim 7, wherein the puncturing of a packet comprises puncturing a packet by adjusting an automatic gain control associated with the modified internal message transmitted on the receive frequency channel.

23. The method of claim 6, wherein the received message corresponds to a data packet.

24. The method of claim 23, wherein the modified version of the received message includes one or more modified fields in a header-portion as compared to the received message.

25. The method of claim 24, wherein the modified version of the received message includes a modified Timestamp field.

40. The method of claim 6, wherein deliberate error is added into the transmission of the modified internal message on the receive frequency channel to reduce a likelihood that the modified internal message will be successfully decoded by receivers monitoring the receive frequency channel.

41. The method of claim 6, wherein the modified internal message is transmitted on the receive frequency channel to improve reception of the modified internal message on the transmit frequency channel without achieving successful transmission of the modified internal message on the receive frequency channel.

10. A modulator/demodulator (MODEM) in a frequency translating repeater comprising:

a demodulator section for demodulating a received protocol message that is received on a first frequency channel; and

a modulator section for modulating a modified version of the received protocol message that includes a modified parameter for transmission on both the first frequency channel and a second frequency channel.

11. The MODEM according to claim 10, wherein the modified protocol message transmitted on the first frequency channel is punctured or truncated.

26. The MODEM of claim 10, wherein the received protocol message corresponds to a data packet.

27. The method of claim 26, wherein the modified version of the received protocol message includes one or more modified fields in a header-portion as compared to the received protocol message.

28. The method of claim 27, wherein the modified version of the received protocol message includes a modified Timestamp field.

12. A physical layer repeater, comprising:

a transceiver for receiving a control message packet on a first frequency channel and for transmitting a modified version of the control message packet on a second frequency channel different from the first frequency channel; and

a modulator/demodulator (MODEM) coupled to the transceiver for demodulating the received control message packet on the first frequency channel and for modulating the modified version of the control message packet with an unmodified media access control (MAC) layer transmitted on the second frequency channel to achieve a network objective, wherein the modified version of the control message packet includes a first portion that corresponds to an unmodified version of the received control message packet and that includes the unmodified MAC layer, and a second portion that contains one or more modified header fields as compared to a corresponding portion from the received control message packet.

13. The physical layer repeater of claim 12, wherein the network objective comprises one of frequency translation of the modified control message packet from the first frequency channel to the second frequency channel, limiting access point (AP) connectivity and prioritizing client access.

14. The physical layer repeater of claim 12, wherein the physical layer repeater comprises one of a regenerative and a non-regenerative repeater.

29. The physical layer repeater of claim 12, wherein the received control message packet corresponds to a data packet.

30. The method of claim 29, wherein the modified version of the received control message packet includes a modified Timestamp field.

15. An apparatus comprising:

a physical layer repeater configured to wirelessly repeat signals and to selectively generate and transmit control message packets between wireless stations on both a transmit side and a receive side and to manipulate an end to end protocol of the control message packets in a manner that does not change media access control (MAC) addresses of the end to end protocol to achieve a network objective, wherein the physical layer repeater is configured to manipulate the end to end protocol of the control message packets by modifying at least a portion and less than all of the control message packets by deliberately introducing error so as to reduce a likelihood that the modified control message packets will be successfully decoded for transmission to the receive side.

16. An apparatus comprising:

a wireless repeater configured to wirelessly repeat signals and to selectively generate and transmit control message packets at the wireless repeater between wireless stations on both a first communication segment and a second communication segment to ensure that a media access control (MAC) level protocol between the first and second communication segments functions properly, wherein the wireless repeater is configured to selectively modify at least a portion and less than all of the control message packets deliberately introducing error so as to reduce a likelihood that the modified control message packets will be successfully decoded for transmission upon the first communication segment and/or the second communication segment.

20. A repeater for use in a wireless local area network, comprising:

means for receiving a signal on a first frequency channel;

means for transmitting the signal on a second frequency channel different from the first frequency channel; and

means, coupled to the means for receiving and the means for transmitting, for demodulating a receive control message packet on the first frequency channel and for modulating one or more transmit control message packets that are transmitted by the means for transmitting on the first frequency channel in response to the receive control message packet, wherein the one or more transmit control message packets each include a first portion that corresponds to an unmodified version of the receive control message packet and a second portion that is modified from a corresponding portion of the receive control message packet by deliberately introducing error so as to reduce a likelihood that the one or more transmit control message packets will be successfully decoded at a receiver.

21. A modulator/demodulator (MODEM) in a frequency translating repeater comprising:

means for demodulating a received protocol message that is received on a first frequency channel; and

means for modulating a modified version of the received protocol message that includes a modified parameter for transmission on both the first frequency channel and a second frequency channel.

22. A physical layer repeater, comprising:

means for receiving a control message packet on a first frequency channel;

means for transmitting a modified version of the control message packet on a second frequency channel different from the first frequency channel; and

means, coupled to the means for receiving and the means for transmitting, for demodulating the received control message packet on the first frequency channel and for modulating the modified version of the control message packet with an unmodified media access control (MAC) layer transmitted on the second frequency channel to achieve a network objective, wherein the modified version of the control message packet includes a first portion that corresponds to an unmodified version of the received control message packet and that includes the unmodified MAC layer, and a second portion that contains one or more modified header fields as compared to a corresponding portion from the received control message packet.

31. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a repeater for use in a wireless local area network, cause the repeater to perform operations, the instructions comprising:

program code to receive a signal on a first frequency channel;

program code to transmit the signal on a second frequency channel different from the first frequency channel; and

program code to demodulate a receive control message packet on the first frequency channel and to modulate one or more transmit control message packets on the first frequency channel in response to the receive control message packet, wherein the one or more transmit control message packets each include a first portion that corresponds to an unmodified version of the receive control message packet and a second portion that is modified from a corresponding portion of the receive control message packet by deliberately introducing error so as to reduce a likelihood that the one or more transmit control message packets will be successfully decoded at a receiver.

32. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a modulator/demodulator (MODEM) in a frequency translating repeater, cause the MODEM to perform operations, the instructions comprising:

program code to demodulate a received protocol message that is received on a first frequency channel; and

program code to modulate a modified version of the received protocol message that includes a modified parameter for transmission on both the first frequency channel and a second frequency channel.

33. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by a physical layer repeater, cause the physical layer repeater to perform operations, the instructions comprising:

program code to receiving a control message packet on a first frequency channel;

program code to transmitting a modified version of the control message packet on a second frequency channel different from the first frequency channel; and

program code to demodulate the received control message packet on the first frequency channel and to modulate the modified version of the control message packet with an unmodified media access control (MAC) layer transmitted on the second frequency channel to achieve a network objective, wherein the modified version of the control message packet includes a first portion that corresponds to an unmodified version of the received control message packet and that includes the unmodified MAC layer, and a second portion that contains one or more modified header fields as compared to a corresponding portion from the received control message packet.

34. A method of operating a repeater for use in a wireless local area network, comprising:

receiving a signal on a first frequency channel;

transmitting the signal on a second frequency channel different from the first frequency channel;

demodulating a receive control message packet on the first frequency channel; and

modulating one or more transmit control message packets on the first frequency channel in response to the receive control message packet,

wherein the one or more transmit control message packets each include a first portion that corresponds to an unmodified version of the receive control message packet and a second portion that is modified from a corresponding portion of the receive control message packet by deliberately introducing error so as to reduce a likelihood that the one or more transmit control message packets will be successfully decoded at a receiver.

35. The method of claim 34, wherein the second portion is punctured or truncated to introduce the error.

39. The method of claim 34, wherein the first portion of the one or more transmit control message packets are modified such that receivers receiving the one or more transmit control message packets receive different data within the first portion of the one or more transmit control message packets as compared to the corresponding portion from the receive control message packet.

36. A method of operating a repeater for use in a wireless local area network, comprising:

receiving a signal on a first frequency channel;

transmitting the signal on a second frequency channel different from the first frequency channel;

demodulating a receive control message packet on the first frequency channel; and

modulating one or more transmit control message packets on the second frequency channel in response to the receive control message packet,

wherein the one or more transmit control message packets each include a first portion that corresponds to an unmodified version of the receive control message packet and a second portion that contains one or more modified header fields as compared to a corresponding portion from the receive transmit control message.

37. The method of claim 36, wherein the one or more modified header fields include a modified Current Channel field and/or a modified Timestamp field.

38. The method of claim 36, wherein the one or more modified header fields do not include a sequence number, source address or destination address.

42. A method of operating a modulator/demodulator (MODEM) in a frequency translating repeater comprising:

demodulating a received protocol message that is received on a first frequency channel; and

modulating a modified version of the received protocol message that includes a modified parameter for transmission on both the first frequency channel and a second frequency channel.