Method and system for improved beacon acquisition performance with time slot and antenna sector reuse

• US 7,280,829 B2
• Filed: 04/29/2005
• Issued: 10/09/2007
• Est. Priority Date: 09/20/2002
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Rudolf, Marian
• Primary Examiner(s): Trinh; Sonny
• Application Number:
  US11/118,872
• Publication Number:
  US 20050192060A1
• Time in Patent Office: 893 Days
• Field of Search: 455/434, 455/436, 455/435.2, 455/440, 455/443, 455/422.1, 455/561, 455/562.1, 455/91, 455/115.1, 455/502, 455/67.13, 455/63.1, 455/450, 455/452.2
• US Class Current: 455/434
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 48/12 using downlink control channel

Abstract

A wireless multi-cell communication system, such as a time division duplex (TDD) system, includes at least one wireless transmit/receive unit (WTRU) and a plurality of base stations which broadcast beacon signals into a plurality of sectors of a cell of the system. Beacon channel acquisition performance is enhanced by reducing beacon channel mutual interference. Each of the base stations broadcast a beacon signal into at least one of the cell sectors in a first time slot at least another one of the cell sectors in a second time slot different from the first time slot. The WTRU determines, at a particular position, which one of the beacon signals has the best signal quality, acquires the one beacon signal and establishes communications via the base station that generated the one beacon signal having the best signal quality.

Claims

1. In a wireless multi-cell communication system including a plurality of base stations which broadcast beacon signals into a plurality of sectors of a cell of the system, a method of enhancing beacon channel acquisition performance by reducing beacon channel mutual interference, the method comprising:

(a) each of the base stations broadcasting a beacon signal into at least one of the cell sectors in a first time slot; and

(b) each of the base stations broadcasting a beacon signal into at least another one of the cell sectors in a second time slot different from the first time slot.

2. The method of claim 1 further comprising:

(c) determining, at a particular position, which one of the beacon signals has the best signal quality; and

(d) acquiring the one beacon signal and establishing communications via the base station that generated the one beacon signal having the best signal quality.

3. The method of claim 2 wherein steps (c) and (d) are performed by at least one wireless transmit/receive unit (WTRU) located at the particular position.

4. The method of claim 1 wherein the wireless multi-cell communication system is a time division duplex (TDD) system.

5. The method of claim 1 wherein each cell has at least three cell sectors, and each base station broadcasts a beacon signal into two of the at least three cell sectors in a first time slot, and broadcasts a beacon signal into the remaining cell sector(s) in a second time slot different from the first time slot.

6. The method of claim 1 wherein each of the time slots is offset from each of the other time slots by a predetermined number of time slots.

7. A wireless multi-cell communication system for enhancing beacon channel acquisition performance by reducing beacon channel mutual interference, the system comprising:

(a) at least one wireless transmit/receive unit (WTRU); and

(b) a plurality of base stations for broadcasting beacon signals into a plurality of sectors of a cell of the system, wherein each of the base stations comprises at least one transmitter for broadcasting a beacon signal into at least one of the cell sectors in a first time slot, and for broadcasting a beacon signal into at least another one of the cell sectors in a second time slot different from the first time slot.

8. The system of claim 7 wherein the at least one WTRU determines, at a particular position, which one of the beacon signals has the best signal quality, wherein the WTRU acquires the one beacon signal and establishes communications via the base station that generated the one beacon signal having the best signal quality.

9. The system of claim 7 wherein the wireless multi-cell communication system is a time division duplex (TDD) system.

10. The system of claim 7 wherein each cell has at least three cell sectors, and each base station broadcasts a beacon signal into two of the at least three cell sectors in a first time slot, and broadcasts a beacon signal into the remaining cell sector(s) in a second time slot different from the first time slot.

11. The system of claim 7 wherein each of the time slots is offset from each of the other time slots by a predetermined number of time slots.

12. In a wireless multi-cell communication system including a plurality of base stations, a method of enhancing beacon channel acquisition performance by reducing beacon channel mutual interference, the method comprising:

(a) a first one of the base stations broadcasting beacon signals into a first cell of the system in a first time slot;

(b) the first one of the base stations broadcasting beacon signals into a second cell of the system in a second time slot different from the first time slot.

13. The method of claim 12 further comprising:

(c) a second one of the base stations broadcasting beacon signals into a third cell of the system in a third time slot; and

(d) the second one of the base stations broadcasting beacon signals into a fourth cell of the system in a fourth time slot different from the third time slot.

14. The method of claim 13 further comprising:

(e) determining, at a particular position, which one of the beacon signals has the best signal quality; and

(f) acquiring the one beacon signal and establishing communications via the base station that generated the one beacon signal having the best signal quality.

15. The method of claim 14 wherein steps (e) and (f) are performed by at least one wireless transmit/receive unit (WTRU) located at the particular position.

16. The method of claim 13 wherein each of the time slots is offset from each of the other time slots by a predetermined number of time slots.

17. The method of claim 12 wherein the wireless multi-cell communication system is a time division duplex (TDD) system.

18. A wireless multi-cell communication system for enhancing beacon channel acquisition performance by reducing beacon channel mutual interference, the system comprising:

(a) at least one wireless transmit/receive unit (WTRU); and

(b) a first base station which broadcasts beacon signals into a first cell of the system in a first time slot and into a second cell of the system in a second time slot different from the first time slot.

19. The system of claim 18 further comprising:

(c) a second base station which broadcasts beacon signals into a third cell of the system in a third time slot and into a fourth cell of the system in a fourth time slot different from the third time slot.

20. The system of claim 19 wherein the at least one WTRU determines, at a particular position, which one of the beacon signals has the best signal quality, wherein the WTRU acquires the one beacon signal and establishes communications via the base station that generated the one beacon signal having the best signal quality.

21. The system of claim 19 wherein each of the time slots is offset from each of the other time slots by a predetermined number of time slots.

22. The system of claim 18 wherein the wireless multi-cell communication system is a time division duplex (TDD) system.