Modeling interference in a cellular radiotelephone network

• US 5,768,687 A
• Filed: 10/03/1996
• Issued: 06/16/1998
• Est. Priority Date: 10/03/1995
• Status: Expired due to Term

• Current Assignee: Chartoleaux KG LLC (Intellectual Ventures LLC)
• Original Assignee: Orange S.A.
• Inventors: Marzoug, Mongi
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Orgad, Edan
• Application Number:
  US08/724,868
• Time in Patent Office: 621 Days
• Field of Search: 455/422, 455/63, 455/9, 455/501, 455/524, 455/67.1, 455/67.4, 455/226.1, 455/226.3, 370/252
• US Class Current: 455/63.1
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/18 Network planning tools

Abstract

In a cellular radiotelephone network comprising cells served by respective base stations, the modeling of interference includes selecting a first frequency in the frequency spectrum allocated to the network, selecting a point of the network at which radio signals emitted at least at the first frequency of the spectrum from the base stations are received in accordance with a propagation model, assigning respective coefficients to the received radio signals, a coefficient being equal to 1 if the selected frequency is allocated to a base station emitting one of the received radio signals, and equal to 0 otherwise, and multiplying the radio signals by the respective coefficients to derive products that are summed to yield an interference model.

Claims

1. A method of modeling interference in a cellular radiotelephone network having cells served by respective base stations, wherein a frequency spectrum comprising a finite number of frequencies is allocated to said network and a propagation model indicates radio signals respectively emitted at each frequency of said spectrum from said base stations of said network and received at a point of said network, said method comprising:

selecting a selected frequency in said spectrum allocated to said cellular radiotelephone network,

selecting in said network a selected point for which said propagation model is determined,

assigning respective coefficients to the radio signals at the selected frequency received at the selected point, one of said coefficients being equal to 1 if said selected frequency is allocated to a base station emitting a respective one of said radio signals, and equal to 0 otherwise,

multiplying said radio signals at said selected frequency received at said selected point by the respective coefficients into respective products, and

summing said respective products to yield an interference model.

2. A method as claimed in claim 1 further comprising dividing said interference model by said signal emitted at said selected frequency from said base station serving said selected point of said network.

3. A method of modeling interference in a cellular radiotelephone network having cells served by respective base stations, wherein a frequency spectrum comprising a finite number of frequencies is allocated to said network and a propagation model indicates radio signals respectively emitted at each frequency of said spectrum from said base stations of said network and received at a point of said network, said method comprising:

(a) selecting a first selected frequency and second selected frequencies in said spectrum allocated to said cellular radiotelephone network,

(b) selecting in said network a selected point for which said propagation model is determined,

(c) for each of said first selected frequency and second selected frequencies;

assigning coefficients respectively to the radio signals at said each selected frequency received at the selected point, each said respective coefficient being equal to 1 if said each selected frequency is allocated to a base station emitting a respective one of said radio signals, and equal to 0 otherwise,

multiplying said radio signals at said each selected frequency received at said selected point by the respective coefficients into respective products, and

summing said respective products to derive a first interference model,

(d) assigning interference ratios respectively to the first interference models respectively derived for said first and second selected frequencies, said interference ratio relative to a respective first interference model being a function of the difference between said first selected frequency and the respective second selected frequency, except for the interference ratio relative to said first selected frequency which is equal to 1,

(e) multiplying said first interference models respectively by the interference ratios into model products, and

(f) summing said model products to yield a second interference model.

4. A method of modeling interference in a cellular radiotelephone network having cells served by respective base stations, wherein a frequency spectrum comprising a finite number of frequencies is allocated to said network and a propagation model indicates radio signals respectively emitted at each frequency of said spectrum from said base stations of said network and received at a point of said network, said method comprising:

(a) selecting a selected frequency in said spectrum allocated to said cellular radiotelephone network,

(b) selecting plural selected points in said network situated in the same cell, propagation models being respectively determined for said selected points,

(c) for each said selected point;

assigning respective coefficients to the radio signals at the selected frequency received at the selected point, one of said coefficients being equal to 1 if said selected frequency is allocated to a base station emitting a respective one of said radio signals, and equal to 0 otherwise,

multiplying said radio signals at said selected frequency received at said selected point by the respective coefficients into respective products, and

summing said respective products to derive a first interference model, and

(d) averaging the first interference models respectively derived for said selected points to yield a second interference model.

5. The method claimed in claim 4 wherein said averaging step includes calculation of an arithmetic mean of said first interference models respectively derived for said plural selected points.

6. The method claimed in claim 4 wherein said averaging step includes calculation of a quadratic mean of said first interference models respectively derived for said plural selected points.