Multiple trigger initiated handover execution in WiMAX networks

Abstract

Handover in mobile networks considers Quality of Service (QoS) parameters such as signal strength, signal to interference noise ratio (SINR), bit error rate (BER) etc. for its initiation. Handover considering signal strength is a basic scheme in mobile networks. Considering only signal strength is not ideal for WiMAX networks, wh ich has stringent QoS requirements.Signal strength along with hysteresis and threshold serves as an accurate handover mechanism in WiMAX network. But it is necessary that selected target base station have enough capacity to handle the data of mobile station. Moreover considering the mobility of the users in vehicular environments, user velocity must also be considered before handover execution to avoid unnecessary handovers. In this paper we propose a multiple trigger initiated handover execution which considers the signal strength along with hysteresis and threshold, the estimation of free capacity and dependence on mobile velocity during the handover process. We evaluate our proposed scheme in Opnet Modeler simulator and its performance is verified.

Performance analysis of vertical handover techniques based on IEEE 802.21: Media independent handover standard

“…Most of the schemes used SINR with RSS for selecting a network for the handover. A scheme based on the similar characteristics is presented in the work of Winston and Shaji 66 . This scheme first checks a threshold that is based on the RSS.…”

Reducing handoff delay by adaptive threshold tuning and location updates in mobile WiMAX

“…[5] Proposes hierarchical design concept of a preamble for orthogonal frequency division multiplexing (OFDM) based mobile mesh networks to reduce handoff overhead. In [6] a multiple trigger initiated handoff execution is proposed which considers signal strength along with hysteresis and threshold, free capacity estimation and dependence on mobile velocity during handoff process. The two fast handoff mechanisms, fast base station switching and macro diversity handoff, operate with diversity set containing base station list.…”