PALLAB KANTI PODDER1, MD. ASRAF ALI2, UZZAL KUMAR PRODHAN3 and MOHAMMED IBRAHIM HUSSAIN4
1=Lecturer , Department of Information and Communication Engineering, Pabna University of Science and Technology, Pabna , 2&3=Assitant Professor and 4 =Senior Lecturer, Computer Science and Engineering Department, Bangladesh University, Dhaka, Bangladesh.
ABSTRACT
In WIMAX, for users, disconnectivity in the connection is intolerable. Consequently such users need to be allocated channels (permanent and reserved) so that they never face disconnection due to unavailability of channels in the cell. Like other wireless communication networks, where traffic is dense, cell size is reduced to increase the number of cells for the enhancement of the QoS in WIMAX network. Moreover, since the allocation of the channels within the cells is a major concern, in this paper, we have proposed two channel allocation schemes: No Priority Scheme (NPS) and Reserved Channel Scheme (RCS), in WIMAX scenario in context of permanent channel allocation in order to reduce the probabilities of blocking (Pb), handover failure (Ph), forced termination (Pft) and of not completed calls (Pnc). Between two of the handover schemes, RCS is prioritized and NPS is non-prioritized handover scheme. The system simulations have been accomplished on these schemes using MATLAB and also compared their results in terms of Blocking Probability (Pb), Probability of handover failure (Ph), Probability of forced termination (Pft) and Probability of not completed calls (Pnc). Also traffic conditions taken for this simulation environment are uniform.
Keywords: Non prioritized scheme, reserved channel scheme, Blocking probability, Handover failure, Forced termination, Not completed calls and Channel allocation.