Analog-to-digital transition: selecting the optimal cellular rad

Details Analog-to-digital transition: selecting the optimal cellular rad Analog-to-digital transition: selecting the optimal cellular rad

1997-06-03

1999-09-28

Chin, Wellington

Telecommunications

Radiotelephone system

Usage measurement

455453, 455552, 455553, H04M 1500

Patent

active

059603399

ABSTRACT:
In a transition phase of a cellular cell from analog-to-digital radio service it must be determined how many of the base station radios in a cell must be changed over from analog to digital, given the proportion of mobile phones with dual-mode capability to analog phones. A dual-mode mobile phone has the capability to interface with both analog and digital radios. In determining the radio mix, it is desirable to maximize the call handling capacity of a cell, or minimize the blocking experienced by the mobile subscribers. To address these questions, an analytical model is developed to compute the blocking rate experienced by mobile callers in a cell, given the cell's offered load, the mix of analog and dual-mode mobiles, and the analog-digital split of the RF channels available to the cell. The model's results enable selection of the channel split that gives the lowest blocking rate, and to compile charts that show the relationship between the proportion of dual-mode mobiles, the number of digital radios in a cell, and the maximum offered load that can be served at a specified blocking rate.

REFERENCES:
patent: 5870427 (1995-02-01), Tiedeman, Jr. et al.
patent: 5870676 (1996-02-01), Durvasula et al.
patent: 5878078 (1996-03-01), Griffin et al.
patent: 5881376 (1995-12-01), Lundberg et al.
R.B. Cooper, "Introduction to Queueing Theory", Macmillan Co., New York, 1972, Chapters 3,4,5, pp. 63-203.
Y.Rapp, "Planning of Junction Network in a Multiexchange Area", Ericsson Technics, 20, No. 1, pp. 77-130, 1964 (See "AA, Introduction to Queueing Theory-R. Cooper".).

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