Estimation of Vertical Handover Probability in an Integrated UMTS and WLAN Networks

Authors: Diganta Kumar Pathak, Manashjyoti Bhuyan, Vaskar Deka

Abstract:

Vertical Handover(VHO) among different communication technologies ensuring uninterruption and service continuity is one of the most important performance parameter in Heterogenous networks environment. In an integrated Universal Mobile Telecommunicatin System(UMTS) and Wireless Local Area Network(WLAN), WLAN is given an inherent priority over UMTS because of its high data rates with low cost. Therefore mobile users want to be associated with WLAN maximum of the time while roaming, to enjoy best possible services with low cost. That encourages reduction of number of VHO. In this work the reduction of number of VHO with respect to varying number of WLAN Access Points(APs) in an integrated UMTS and WLAN network is investigated through simulation to provide best possible cost effective service to the users. The simulation has been carried out for an area (7800 × 9006)m2 where COST-231 Hata model and 3GPP (TR 101 112 V 3.1.0) specified models are used for WLAN and UMTS path loss models respectively. The handover decision is triggered based on the received signal level as compared to the fade margin. Fade margin gives a probabilistic measure of the reliability of the communication link. A relationship between number of WLAN APs and the number of VHO is also established in this work.

Keywords: VHO, UMTS, WLAN, MT, AP, BS.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099002

References:

[1] Shiao-Li Tsao and Chia-Ching Lin , Design and Evaluation of UMTS WLAN Interworking Strategies, Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th (Volume:2 ) Page No 777 - 781.
[2] S. Mohanty, ”A new architecture for 3G and WLAN integration and inter-system handover management”, Springer Journal of Wireless Networks, December 2006, Volume 12, Issue 6, pp 733-745
[3] Tom Van Leeuwen , Ingrid Moerman, Piet Demeester, ”Location assisted fast vertical handover for UMTS/WLAN overlay networks” .Elsevier Computer Communications 29 (2006) 2601-2611.
[4] George Lampropoulos, Nikos Passas, Lazaros Merakos, Alexandros Kaloxylos, ”Handover Management Architectures in Integrated WLAN/Cellular Networks”, IEEE Communication Surveys fourth quarter 2005, Volume 7, NO. 4.
[5] Diganta Kumar pathak, Manasjyoti Bhuyan, Vaskar Deka and Maushumi Barooah, ”Constraint Estimation for RSSI based Handoff between UMTS and WLAN”. Proceedings of IEEE 2013 1st International Conference on Emerging Trends and Applications in Computer science.
[6] T S Rappaport, ”Wireless Communications Principles and Practise” .Second Edition Pearson Education.
[7] V.H MAC DONALD; ”The Cellular Concept”,” The Bell System Technical Journal Volume 58, No. 1 January 1979.
[8] M. Coinchon, A. P. Salovaara, and J. E. Wagen, ”The Impact of Radio Propagation Predictions on Urban UMTS Planning” .2002 International Zurich Seminar on Broadband Communications Access Transmission-Networking, February 19-21, Zurich, Switzerland, 2002. 1998.
[9] Universal Mobile Telecommunications System (UMTS); ”Selection procedures for the choice of radio transmission technologies of the UMTS ”, (UMTS 30.03 version 3.1.0) TR 101 112 V3.1.0 (1997-11).
[10] S. Kouhbor, Julien Ugon, Alex Kruger, Alex Rubinov,”Optimal Placement of Access Point in WLAN Based on a New Algorithm”, International Conference on Mobile Business, 11-13 July, 2005
[11] Xiaohuan Yan, Nallasamy Mani and Y. Ahmet Sekercioglu, ”A Traveling Distance Prediction Based Method to Minimize Unnecessary Handovers from Cellular Networks to WLANs”, IEEE COMMUNICATIONS LETTERS, VOL. 12, NO. 1, JANUARY 2008.