CDMA frequency planning for fixed wireless application

• US 6,560,459 B1
• Filed: 12/18/1998
• Issued: 05/06/2003
• Est. Priority Date: 12/18/1998
• Status: Expired due to Term

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Wong, Tony W.
• Primary Examiner(s): NGUYEN, PHUONGCHAU BA
• Application Number:
  US09/216,674
• Time in Patent Office: 1,600 Days
• Field of Search: 370/310,312,315,317-320,331-335,342-344,432,436,437,441,478,479,482, 504, 506, 509, 513 455/434,440,441,444,446,447,450-457,526,60,62,63,65,67.3,464,9,10,13.4,500,501
• 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 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The foregoing objects are achieved as is now described. A method for evaluating frequency plans for a CDMA based communication system having fixed base radio telephones is provided. The method begins by determining locations of a plurality of antennas. The plurality of antennas provide a coverage area for radio telephones. Then the method generates locations of radio telephones within the coverage area. Next, a distance from each radio telephone to the antennas is calculated. Then frequencies are allocated to the antennas. The resulting communication parameters between the radio telephones and the antennas are evaluated. Next, the coverage area which provides optimum power control to each radio telephone is determined. A frequency reuse factor is calculated to determine the efficiency of the allocated frequencies such that frequency allocation plans can be analyzed to determine efficient frequency planning.

Claims

1. A frequency allocation system for a cellular communication system comprising:

a plurality of cells residing substantially adjacent to each other, each cell having at least a first group of sectors and a second group of sectors, wherein said first group of sectors and said second group of sectors provide semicircular shaped coverage to radio telephones;

wherein a first frequency is utilized in said first group of sectors and a second, different frequency is utilized in said second group of sectors, wherein frequencies can be re-utilized by said plurality of cells with greater efficiency because interference between said adjacent cells is reduced;

wherein said semicircular shaped coverage provided by said first sector and said semicircular shaped coverage provided by said second sector combine to provide circular coverage around an antenna; and

wherein said first group of sectors has a plurality of adjacent sectors located within adjacent cells and less than three of said adjacent sectors within adjacent cells utilize the same frequency that is utilized by said first group of sectors.

2. The frequency allocation architecture as in claim 1, wherein said semicircular coverage provided by said first sector and said semicircular coverage provided by said second sector are separated by a line of symmetry.

3. The frequency allocation architecture as in claim 1, wherein cells are divided into six sectors and said six sectors are divided into a first group of three adjacent sectors, and a second group of three adjacent sectors, wherein antennas which service said first group of three adjacent sectors transmit on a first frequency.

4. The frequency allocation architecture as in claim 3, wherein antennas which service said second group of three adjacent sectors transmit on a second frequency and said first frequency is different than said second frequency.

7. The frequency allocation architecture as in claim 4, wherein a first group of three adjacent sectors within a first cell has two adjacent sectors which reside in adjacent cells and which utilized the same frequency as said first group of sectors in said first cell.

5. A frequency allocation architecture, for implementing a cellular communication system which utilizes CDMA technology to attain increased frequency reuse comprising:

a plurality of cells residing substantially adjacent to each other;

wherein each of said plurality of cells are divided into six sectors and said six sectors are divided into a first group of three adjacent sectors, and a second group of three adjacent sectors, wherein antennas which service said first group of three adjacent sectors transmit on a first frequency and antennas which service said second group of three adjacent sectors transmit on a second, different frequency;

wherein said first group of adjacent sectors and said second group of adjacent sectors each provide semicircular shaped coverage that combine to provide circular coverage around an antenna to radio telephones;

wherein frequencies can be re-utilized by said plurality of cells with greater efficiency because interference between said adjacent cells is reduced; and

wherein said first group has seven adjacent sectors which reside in adjacent cells and two of said seven adjacent sectors in adjacent cells utilize the same frequency utilized by said first group of sectors.

6. A frequency allocation architecture, for implementing a cellular communication system which utilizes CDMA technology to attain increased frequency reuse comprising:

a plurality of cells residing substantially adjacent to each other;

wherein each of said plurality of cells are divided into six sectors and said six sectors are divided into a first group of three adjacent sectors, and a second group of three adjacent sectors, wherein antennas which service said first group of three adjacent sectors transmit on a first frequency and antennas which service said second group of three adjacent sectors transmit on a second, different frequency;

wherein said first group of adjacent sectors and said second group of adjacent sectors each provide semicircular shaped coverage that combine to provide circular coverage around an antenna to radio telephones;

wherein frequencies can be re-utilized by said plurality of cells with greater efficiency because interference between said adjacent cells is reduced; and

wherein said first group of sectors has a plurality of adjacent sectors located within adjacent cells, wherein less than three of said adjacent sectors within adjacent cells utilize the same frequency that is utilized by said first group of sectors.