Design and Analysis of a Channel Assignment Scheme for CDMA/TDMA Mobile Networks

Al-Mahdi, Hassan; Nassar, Hamed; Fouad, Yasser; Ali, M.O.

doi:10.1007/s11277-012-0591-9

Cited by 2 publications

(1 citation statement)

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“…The numerous channel assignment schemes include fixed channel assignment (FCA), dynamic channel assignment (DCA), borrowing channel assignment (BCA), and hybrid channel assignment (HCA) [5][6][7][8][9]. Among these, DCA schemes [8,9] are considered to be the most flexible and effective for improving the blocking probability. These schemes are divided into two categories -centralized schemes and distributed schemes [9].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy call admission control combined with distributed dynamic channel assignment and reassignment for cellular mobile systems

Horng

Lin

2015

J Wireless Com Network

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In a cellular mobile system (CMS), the service area is divided into cells, each of which has numerous channels, which are shared by two types of call -new calls and handoff calls. Giving a higher priority to handoff calls than new calls is common practice. However, giving too much priority to handoff calls will result to excessive blocking of new calls. This work firstly proposes a distributed dynamic channel assignment and reassignment (DDCAR) scheme to satisfy three types of constraint -co-channel constraint (CCC), adjacent channel constraint (ACC), and co-site constraint (CSC), simultaneously. The purpose is to minimize the number of available channels that become unavailable for the assignment to new calls and to maximize the number of unavailable channels that become available for release when calls complete. To provide a higher priority to handoff calls, a fuzzy call admission control (FCAC) scheme, combined with the DDCAR, is proposed herein for implementation at the base station. A 7 × 7 CMS with two traffic patterns is employed as the test example. The test results reveal that the FCAC scheme significantly reduces the dropping probability of handoff calls at the cost of increasing the blocking probability of new calls to an acceptable level.

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