Adaptive QoS-Aware Resource Management in Heterogeneous Wireless Networks

Abstract

The integration of different IP-based wireless networks, such as WiMAX and WiFi, becomes a 2-tier heterogeneous wireless networks is a more and more popular issue. In order to support multiple types of service with different QoS requirements in heterogeneous wireless networks, efficient resource management, call admission control strategies, mobility management and overflow handoff call are important issues. In this paper, we propose a resource management strategy including the call admission control, resource reservation mechanism for real-time services and Fuzzy controllers are proposed to adjusting bandwidth of real-time service with parameters dynamically. Simulation result shows that the proposed method improves the previous work (non-adaptive bandwidth borrowing reservation methods) and outperforms the traditional CAC in terms of call dropping probability and call blocking probability.

An Integrated ISV Call Management Strategy in Heterogeneous Wireless Networks

“…The rest of handoff calls are called forced handoff. The traffic mapping between 802.16e and 802.11e is necessary for providing the consistent service between Wi-Fi and WiMAX networks when the handoff occurs [12], and all the traffic types can be classified into three categories in terms of services Type I, Type II and Type III, as shown in Table 1. In order to meet the user's preferences with the connection level issue of QoS, the UGS traffic type such as VoIP, CBR and multimedia services has to provide more stable quality of service.…”

The fuzzy-controller for WiMAX networks

“…Nowadays there are many kinds of wireless access technologies available to satisfy different needs and requirements of users in the heterogeneous wireless environment, such as WiFi, WiMAX and UTRAN [1]. The main feature of the heterogeneous wireless environment is that all the users can switch different access technologies according to their needs.…”

Bandwidth Reservation Based Call Admission Control for Coexisting Heterogeneous Wireless Technologies

“…A number of call admission control schemes for multi-class traffic have been proposed in traditional homogenous networks. One of the key challenges in the CAC for heterogeneous network is to guarantee the potentially different Quality of Service (QoS) requirement from diverse applications, while at the same to ensure that the scarce bandwidth be utilized efficiently [2,3].…”