Frequency transition process for capacity enhancement in a cellular network

• US 6,085,093 A
• Filed: 09/22/1997
• Issued: 07/04/2000
• Est. Priority Date: 09/22/1997
• Status: Expired due to Term

• Current Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Nortel Networks Corporation
• Inventors: Vasudevan, Mini, Faruque, Saleh
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US08/935,285
• Time in Patent Office: 1,016 Days
• Field of Search: 455/446, 455/447, 455/448, 455/450, 455/62, 455/63, 455/422, 455/449, 455/FOR 106
• 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

Abstract

The frequency transition process migrates frequency groups from one frequency reuse plan to another. In response to a change in capacity requirements, the process migrates each layer of the present frequency reuse plan to the layers of the new frequency reuse plan.

Claims

1. A method for transitioning a percentage of frequencies from an N=6 frequency reuse plan to an N=4 frequency reuse plan in a cellular radiotelephone system having a first, a second, and a third frequency reuse direction, each frequency reuse direction assigned frequency groups that are different from the frequency groups assigned to the remaining reuse directions, the method comprising the steps of:

transforming the percentage of frequencies from frequency groups 1-4 of the N=6 plan, in the first reuse direction, to frequency groups 1-4 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 5 and 6 of the N=6 frequency reuse plan, in the first reuse direction, to the first repetition of frequency groups 1 and 2 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 7-10 of the N=6 frequency reuse plan, in the second reuse direction, to frequency groups 5-8 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 11 and 12 of the N=6 frequency reuse plan, in the second reuse direction, to the first repetition of frequency groups 5 and 6 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 13-16 of the N=6 frequency reuse plan, in the third reuse direction, to frequency groups 9-12 respectively of the new plan; and

transforming the percentage of frequencies from frequency groups 17 and 18 of the N=6 frequency reuse plan, in the third reuse direction, to the first repetition of frequency groups 9 and 10 respectively of the new plan.

2. A method for transitioning a percentage of frequencies from an N=4 frequency reuse plan to an N=6 frequency reuse plan in a cellular radiotelephone system having a first, a second, and a third frequency reuse direction, each frequency reuse direction assigned frequency groups that are different from the frequency groups assigned to the remaining reuse directions, the method comprising the steps of:

transforming the percentage of frequencies from frequency groups 1-4 of the N=4 frequency reuse plan, in the first reuse direction, to frequency groups 1-4 respectively of the new plan;

transforming the percentage of frequencies from a first repetition of frequency groups 1 and 2 of the N=4 frequency reuse plan, in the first reuse direction, to frequency groups 5 and 6 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 5-8 of the N=4 frequency reuse plan, in the second reuse direction, to frequency groups 7-10 respectively of the new plan;

transforming the percentage of frequencies from a first repetition of frequency groups 5 and 6 of the N=4 frequency reuse plan, in the second reuse direction, to frequency groups 11 and 12 respectively of the new plan;

transforming the percentage of frequencies from frequency groups 9-12 of the N=4 frequency reuse plan, in the third reuse direction, to frequency groups 13-16 respectively of the new plan; and

transforming the percentage of frequencies from a first repetition of frequency groups 9 and 10 of the N=4 frequency reuse plan, in the third reuse direction, to frequency groups 17 and 18 respectively of the new plan.