Channel Allocation in TETRA Networks Using Channel Reservation
Farid Azizzadeh, Seyed Ali Ghorashi · 2011
In TErrestrial Trunked Radio (TETRA) networks, due to the limited number of available channels in each cell, obtaining the minimum number of allocated channels in order to satisfy Grade of Service (GoS) as well as user priority requirements is a critical task.This paper proposes a allocation algorithm for TETRA networks. Considering different levels of users' priority, the proposed algorithm provides the expected GoS for TETRA costumers while the priority criteria are satisfied. Channel allocation procedure for these networks are modeled by a one-dimensional Markov chain and analytical results for some performance metrics such as call blocking probability and channel utilization are obtained. In the proposed algorithm, the priority of users is guaranteed by reservation method. In order to provide the required GoS for users, the minimum number of required channels to be allocated to each priority is calculated. The simulation results of a TETRA network with a realistic traffic scenario for three types of user priorities (high, medium, and low) show that the proposed algorithm uses the minimum number of channels while satisfies all given GoSs.