Method and apparatus for communications resource allocation for a wireless communications system

• US 6,339,708 B1
• Filed: 10/05/1998
• Issued: 01/15/2002
• Est. Priority Date: 05/22/1997
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Wang, Li-Chun
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): Gesesse, Tilahun
• Application Number:
  US09/166,219
• Time in Patent Office: 1,198 Days
• Field of Search: 455/447, 455/446, 455/448, 455/67.1, 455/450, 455/455, 455/561, 455/560, 455/452
• US Class Current: 455/447
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/30 Special cell shapes, e.g. doughnuts or ring cells
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method and apparatus for communications resource allocation in a wireless communications system having a total system bandwidth. A service area is divided into a plurality sectors. A first set of base station antennas are positioned within a first set of sectors. The first set of antennas have main beams set at a first set of angles, and each antenna corresponds to a sector within the first set of sectors. A second set of base station antennas are positioned within a second set of sectors adjacent to the first set of sectors. The second set of antennas have main beams set at a second set of angles, and each antenna corresponds to a sector within the second set of sectors. Each sector is assigned a portion of the total system bandwidth.

Claims

1. A method for communications resource allocation for a wireless communications system having a total system bandwidth, comprising the steps of:

dividing a service area into a plurality of sectors;

positioning a first set of antennas within a first set of sectors, said first set of antennas having main beams set a first set of angles, and where each antenna of said first set of antennas corresponds to a sector within said first set of sectors;

positioning a second set of antennas within a second set of sectors adjacent to said first set of sectors, said second set of antennas having main beams set a second set of angles, and where each antenna of said second set of antennas corresponds to a sector within said second set of sectors;

separating the total system bandwidth into a plurality of channel sets;

assigning each sector a channel set in a channel repeat pattern that provide s a reuse factor of K, where K is at least equal to 2; and

wherein K is defined by the following equation;

2. The method of claim 1 wherein said first set of angles are 30 degrees, 150 degrees and 270 degrees, and said second set of angles are 90 degrees, 210 degrees and 330 degrees.

3. The method of claim 2 wherein said assigning comprises:

separating each channel set into one of three categories;

assigning channel sets for a first category to those sectors having antennas set at said angles of 210 degrees and 330 degrees;

assigning channel sets for a second category to those sectors having antennas set at said angles of 30 degrees and 150 degrees; and

assigning channel sets for a third category to those sectors having antennas set at said angles of 90 degrees and 270 degrees.

4. The method of claim 3 wherein any sectors assigned the same channel set are separated by at least one sector.

5. The method of claim 4 wherein the total system bandwidth is separated into 3K channel sets.

6. A method for communications resource allocation for a wireless communications system having a total system bandwidth, comprising the steps of:

dividing a service area into a plurality of sectors;

positioning a first set of antennas within a first set of sectors, said first set of antennas having main beams set a first set of angles, and where each antenna of said first set of antennas corresponds to a sector within said first set of sectors;

positioning a second set of antennas within a second set of sectors adjacent to said first set of sectors, said second set of antennas having main beams set a second set of angles, and where each antenna of said second set of antennas corresponds to a sector within said second set of sectors;

separating the total system bandwidth into a plurality of channel sets;

assigning each sector a channel set in a channel repeat pattern that provides a reuse factor of K, where K is at least equal to 2; and

determining whether K is an even or odd integer;

forming said reuse pattern using a cluster of 4N² set of sectors, within which each channel set is reused 4N times, if said K is an odd integer; and

forming said reuse pattern using a cluster of N² set of sectors, within which each channel set is used N times, if said K is an even integer.

7. A communications system having a service area divided into a plurality of sectors, and also having a total system bandwidth separated into a plurality of channel sets, comprising:

a first set of base station antennas within a first set of sectors, said first set of antennas having main beams set a first set of angles, and where each antenna of said first set of antennas corresponds to a sector within said first set of sectors;

a second set of base station antennas within a second set of sectors adjacent to said first set of sectors, said second set of antennas having main beams set a second set of angles, and where each antenna of said second set of antennas corresponds to a sector within said second set of sectors;

at least one transceiver coupled to each of said first and second set of antennas, said transceiver communicating signals using an assigned channel set that is part of a channel repeat pattern that provides a reuse factor of K, where K is at least equal to 2, for the system; and

wherein K is defined by the following equation;

8. The apparatus of claim 7, wherein said first set of angles are 30 degrees, 150 degrees and 270 degrees, and said second set of angles are 90 degrees, 210 degrees and 330 degrees.

9. The apparatus of claim 8, wherein the total system bandwidth is separated into 3K channel sets.