Wireless local area network with enhanced carrier sense provision

• US 6,067,291 A
• Filed: 09/23/1997
• Issued: 05/23/2000
• Est. Priority Date: 09/23/1997
• Status: Expired due to Term

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Kamerman, Adriaan, Monteban, Leo, Mud, Rienk
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Boortalary, Forood
• Application Number:
  US08/936,033
• Time in Patent Office: 973 Days
• Field of Search: 370/338, 370/332, 370/333, 370/445, 370/448, 370/449, 370/459, 370/461, 370/462, 370/447, 375/317
• US Class Current: 370/338
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

A method and system of operating a wireless local area network station adapted to transmit and receive a signal within a communication cell. The method includes the steps of establishing a carrier detect threshold level, establishing a defer threshold level, and transmitting a signal when the signal level detected by the network station is above the defer threshold level. Additionally, the method further includes the step of receiving a signal transmission intended for the network station when the power of the received signal transmission is above the carrier detect threshold level.

Claims

1. A method of operating a wireless local area network station comprising the steps of:

establishing a variable carrier detect threshold level, so as to define a range of signal levels above which received signals are processed;

establishing a variable defer threshold level, above which transmission of signals is deferred

receiving a carrier signal having a corresponding power signal level;

transmitting a signal when said power signal level is below said defer threshold; and

processing said carrier signal intended for said network station when said power signal is above said variable carrier detect threshold level.

2. A method in accordance with claim 1 further comprising the step of varying said variable carrier detect threshold level and said variable defer threshold level.

3. A method in accordance with claim 1, further comprising the step of establishing said variable carrier detect threshold level to a level above said variable defer threshold level.

4. A method in accordance with claim 1, further comprising the step of establishing said variable carrier detect threshold level to a level approximately equal to said variable defer threshold level.

5. A method in accordance with claim 1 further comprising the step of establishing said variable carrier detect threshold level to a level below said defer threshold level.

6. A method in accordance with claim 1 further comprising the step of selecting a carrier detect threshold signal level so as to define a communication cell within which a plurality of mobile network stations communicate with a predetermined base station.

7. A method in accordance with claim 6 wherein said step of establishing defer threshold level comprises the steps of selecting a defer threshold signal level such that it is approximately equal to a power level along the power/distance curve of a station located at one edge of said communication cell at a distance approximately located at the opposite side of said communication cell.

8. A method in accordance with claim 1 wherein the size of said communication cell is a function of said carrier detect threshold and said defer threshold.

9. A wireless local area network station adapted to transmit and receive a signal within a communication cell, comprising:

a carrier detect threshold circuit configured to receive a carrier signal having a power signal level, said carrier detect threshold circuit generating a carrier detect indication signal when said power signal level is substantially equal or larger than a variable carrier detect threshole level, so as to define a range of signal levels above said variable carrier detect threshole level wherein received signals are processed;

a defer threshold circuit configured to receive said carrier signal having said power signal level, said defer threshold circuit generating a defer indication signal when said power signal level is substantially equal or larger than a specifiable defer threshold parameter, above which transmission of signals is deferred; and

a signal processing circuit coupled to said carrier detect threshold circuit and said defer threshold circuit so as to receive said carrier detect indication signal and said defer indication signal such that said signal processing circuit processes signal received by said network station in response to said carrier detect indication signal and said signal processing circuit defers transmission of signals by said network station in response to said defer indication signal.

10. The system in accordance with claim 9 wherein the levels of said carrier detect threshold level and said defer threshold level are variable.

11. The system in accordance with claim 10, wherein said carrier detect threshold level is above said defer threshold level.

12. The system in accordance with claim 10, wherein said carrier detect threshold level is approximately equal to said defer threshold level.

13. The system in accordance with claim 10 wherein said carrier detect threshold level is below said defer threshold level.

14. The system in accordance with claim 9 wherein said defer threshold level is approximately equal to a power level along the power/distance curve of a station located at one edge of said communication cell at a distance approximately located at the opposite side of said communication cell.

15. The system in accordance with claim 9 wherein the size of said communication cell is a function of said carrier detect threshold and said defer threshold.