Method, system and components for facilitating wireless communication in a sectored service area

• US 8,265,702 B2
• Filed: 09/19/2011
• Issued: 09/11/2012
• Est. Priority Date: 10/28/2004
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Iacono, Ana Lucia, Chandra, Arty, Zhao, Zheng
• Primary Examiner(s): Brandt, Christopher M
• Application Number:
  US13/236,348
• Publication Number:
  US 20120008608A1
• Time in Patent Office: 358 Days
• Field of Search: 455/562.1, 455/561, 455/446, 455/434, 370/328
• US Class Current: 455/562.1
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A access point (AP) during wireless communication with at least one wireless transmit/receive unit (WTRU), transmits a beacon signal periodically among a plurality of sectors, each sector having its own sector identity, the beacon signal being periodically received at least once in a beacon period and the beacon period comprising a plurality of beacon service periods for all sectors. The AP determines a scheduling value to indicate a number of inactive beacon periods for a first sector to at least one WTRU located in the first sector. The scheduling value is transmitted with the sector identity for the first sector, such that a variable beacon period is established for the first sector, enabling the at least one WTRU located in the first sector to enter a sleep mode for an adjustable period of time.

Claims

1. A method implemented in an access point (AP) for wireless communication with at least one wireless transmit/receive unit (WTRU), comprising:

transmitting a beacon signal periodically among a plurality of sectors, each sector having its own sector identity, the beacon signal being periodically received at least once in a beacon period and the beacon period comprising a plurality of beacon service periods for all sectors;

determining a scheduling value to indicate a number W of inactive beacon periods for a first sector to at least one WTRU located in the first sector;

transmitting a beam access control (BAC) signal via at least one directional beam in a sector in which the first WTRU is located during a beacon service period, the BAC signal indicating allowance or disallowance of transmission of a signal from the first WTRU in the sector during a post-beacon period, the post-beacon period remaining after the beacon service periods for all sectors; and

transmitting the scheduling value with the sector identity for the first sector, such that a variable beacon period is established for the first sector, enabling the at least one WTRU located in the first sector to enter a sleep mode for an adjustable period of time.

2. The method as in claim 1, wherein the value W is determined as a function of the number of sectors.

3. The method as in claim 1, wherein the value W is determined as a function of a load of the AP.

4. The method as in claim 1, wherein the value W is determined as a function of the number of WTRUs in each sector.

5. The method as in claim 1, wherein the value W is determined as a function of a fading environment of the AP.

6. The method as in claim 1 wherein the beam identity is transmitted with the BAC signal.

7. The method as in claim 1, further comprising:

employing multiple collocated antennas, each antenna configured to serve a different set of sectors.

8. The method as in claim 7, further comprising:

determining the BAC signal for each antenna independently based on service load requirements served by the respective antenna; and

adjusting a service ratio of each sector according to the determined BAC signal for each antenna.

9. The method as in claim 8, wherein the BAC signal is further determined independently based on conditions in the sectors served by the respective antenna.

10. An access point (AP), configured for wireless communication with at least one wireless transmit/receive unit (WTRU), the AP comprising:

a transceiver configured to transmit a beacon signal periodically among a plurality of sectors, each sector having its own sector identity, the beacon signal being periodically received at least once in a beacon period and the beacon period comprising a plurality of beacon service periods for all sectors, and further configured to transmit a beam access control (BAC) signal via at least one directional beam in a sector in which the first WTRU is located during a beacon service period;

a control unit configured to determine a scheduling value to indicate a number W of inactive beacon periods for a first sector to at least one WTRU located in the first sector, and further configured to determine the BAC signal to indicate allowance or disallowance of transmission of a signal from the first WTRU in the sector during a post-beacon period, the post-beacon period remaining after the beacon service periods for all sectors; and

the transceiver configured to transmit the scheduling value with the sector identity for the first sector, such that a variable beacon period is established for the first sector, to enable the at least one WTRU located in the first sector to enter a sleep mode for an adjustable period of time.

11. The AP as in claim 10, wherein the control unit is configured to determine the value W as a function of the number of sectors.

12. The AP as in claim 10, wherein the control unit is configured to determine the value W as a function of a load of the AP.

13. The AP as in claim 10, wherein the control unit is configured to determine the value W as a function of the number of WTRUs in each sector.

14. The AP as in claim 10, wherein the control unit is configured to determine the value W as a function of a fading environment of the AP.

15. The AP as in claim 10 wherein transceiver is configured to transmit the beam identity with the BAC signal.

16. The AP as in claim 10, further comprising:

multiple collocated antennas, each antenna configured to serve a different set of sectors.

17. The AP as in claim 16, wherein the control unit is configured to determine the BAC signal for each antenna independently based on service load requirements served by the respective antenna;

and to adjust a service ratio of each sector according to the determined BAC signal for each antenna.

18. The AP as in claim 17, wherein the control unit is further configured to determine the BAC signal independently based on conditions in the sectors served by the respective antenna.