Combined Utility and Adaptive Residence Time-Based Network Selection for 4G Wireless Networks
Next generation wireless networks are expected to include heterogeneous wireless networks to offer a diverse range of multimedia services to mobile users. Due to the heterogeneity and the diversity of access networks, various user applications with differ
- PDF / 420,039 Bytes
- 13 Pages / 439.37 x 666.142 pts Page_size
- 112 Downloads / 211 Views
Combined Utility and Adaptive Residence Time-Based Network Selection for 4G Wireless Networks J. Shankar, C. Amali and B. Ramachandran
Abstract Next generation wireless networks are expected to include heterogeneous wireless networks to offer a diverse range of multimedia services to mobile users. Due to the heterogeneity and the diversity of access networks, various user applications with different Quality of Service (QoS) requirements pose new challenges on multi-interface Mobile Terminal (MT) in designing optimal network selection algorithm for guaranteeing seamless QoS support to the users. Thus, Vertical Hand Off (VHO) is necessary to provide uninterrupted services to mobile users anywhere and anytime in 4G networks. In this paper, Service continuity with guaranteed QoS and minimum VHO rate is considered as a challenging issue. In order to achieve this, discovered networks are evaluated periodically according to the velocity and direction of Mobile Terminal. Network evaluation is carried out through the integration of utility function calculation and cell residence time estimation. The proposed scheme avoids unnecessary VHO by selecting the network based on the capabilities of MT, QoS requirements of ongoing service and characteristics of networks. Thus, it eliminates the probability of HO failure by considering all possible critical factors and adaptive Residence Time (RT) threshold in 4G wireless networks. The results are compared against the performance of utility-based handoff and residence time-based handoff schemes. The simulation results show that the proposed scheme reduces the number of unnecessary handoffs which in turn minimizes the VHO rate and probability of HO failure in 4G wireless networks.
Keywords Vertical Handoff Adaptive residence time QoS
Heterogeneous network
Utility function
J. Shankar (&) C. Amali B. Ramachandran SRM University, Chennai, India e-mail: [email protected] C. Amali e-mail: [email protected] B. Ramachandran e-mail: [email protected]
A. A. Farag et al. (eds.), Proceedings of the 3rd International Conference on Multimedia Technology (ICMT 2013), Lecture Notes in Electrical Engineering 278, DOI: 10.1007/978-3-642-41407-7_2, Springer-Verlag Berlin Heidelberg 2014
11
12
J. Shankar et al.
2.1 Introduction The future wireless and mobile environments are likely to have users to access multiple networks at the same time. In fourth generation (4G) wireless networks, users are able to roam freely from one type of wireless access network to another while preserving the main characteristics of their connections. Therefore, there is a need to have mechanisms to decide which network is the most suitable for each user at each moment for every application that the user requires. Vertical Hand Off (VHO) is the capability to switch on going connections from one Radio Access Network (RAN) to another. The trend is to utilize high bandwidth wireless local area network (WLAN) resource for mobile users in hotspots and switch to Cellular Ne
Data Loading...
