An Adaptive Vertical Handoff Algorithm Based on UMTS and WLAN
نویسندگان
چکیده
According to the characteristics of heterogeneous networks and user demand for seamlessly connection, the necessity of handoff to WLAN was researched. First of all, in order to reduce the influence of shadow fading on received signal strength (RSS), a smoothing algorithm based on support functions was proposed. Then, considering the context of mobile terminals and networks, and by using probabilistic knowledge, we propose an adaptive vertical handoff algorithm based on compensating time. The simulation results show that, compared with two algorithms, the proposed algorithm can make more effective and accurate handoff decisions, reduce the ping-pong effect and interruption probability, thereby greatly improving handoff performance.
منابع مشابه
Adaptive Data Rate Oriented Speed and Capacity Based Vertical Handoff Algorithm
In wireless cellular environment the handoff algorithm determine when the handoff will occur and at which base station. Heterogeneous network such as UMTS, WLAN, WiMax where vertical hand off is required further challenges the cellular network. This paper provides an adaptive multiple attribute vertical hand of algorithm which allows wireless networks to select a mobile terminal using fuzzy log...
متن کاملA Hybrid Connection Admission Control Scheme for QoS Enhancement in UMTS/WLAN Overlay Networks
In this paper we evaluate the performance of an hybrid and adaptive call admission control protocol for UMTS cellular networks with underlying tunnel-WLANs. either at the cell periphery or elsewhere within the UMTS coverage area. This CAC policy is proposed to limit the occurrence of hard IEEE 802.11 WLAN-UMTS handovers to mobiles using real time applications. It is based on the service class d...
متن کاملSimulation of Seamless Vertical Handoff between Umts - Wlan
The method proposed in this paper provides Always Best Connectivity (ABC) to the user. Algorithm implemented in this paper is for two-tier heterogeneous network like UMTS-WLAN. The results are calculated using the RSS value received to MN and threshold values of networks. The packet loss is compared for various speed of node travelling through overlay network. Keyword: UMTS, WLAN, RSS, MIH, ND,...
متن کاملPerformance and Handoff Evaluation of Heterogeneous Wireless Networks (hwns) Using Opnet Simulator
The need for coupling Heterogeneous Wireless Networks (HWNs) such as WLAN, WiMAX or UMTS, play a great role in developing towards fourth generation of wireless networks. Hence, the algorithms for these networks must be developed especially handoff algorithms to present a better performance in such heterogeneous networks. In this paper, several projects have different types of networks were impl...
متن کاملEnergy and Traffic Aware Vertical Handoff in Heterogeneous Wireless Network
The next generation mobile networks have the development trend of integration of cellular networks and Wireless Local Area Networks (WLAN).Considering the heterogeneous environment, Universal Mobile Telecommunication System (UMTS) of cellular technology and WLAN (over IEEE 802.11) are the most promising networks. Integration of these two networks facilitate user for the seamless communication. ...
متن کامل