On demand bandwidth allocation using PMP mode for WIMAX network

Abstract

Bandwidth allocation is always an important element in both fixed and wireless networks. Despite this, IEEE 802.16e-2005 does not propose any bandwidth allocation algorithm or mechanism to support (Worldwide Interoperability For Microwave Access) WiMAX network which includes both uplink (UL) and downlink (DL) directions. Thus, most of the researches are focusing in this area. In order to satisfy the users and multi-type services flow, the total capacity of WiMAX system must be optimized. In this thesis, a new bandwidth allocation mechanism for WiMAX network, called On Demand Bandwidth Allocation (ODBA) is proposed. The proposed mechanism has the management module in Subscribe Station (SS), for the purpose of on demand management of UL bandwidth. This includes UL bandwidth allocation and service flow schedule; and DL bandwidth allocation and service flow scheduling by Base Station (BS). The model was implemented and evaluated using OMNeT++ simulator and the results showed that the ODBA mechanism has a great potential to improve Quality of Service (QoS) of WiMAX system. The performance of ODBA is better than other algorithm in queuing delay time, scheduled probability and throughput.