Mobile Velocity Based Bidirectional Call Overflow Scheme in Hierarchical Cellular System

Authors: G. M. Mir, Moinuddin, N. A. Shah

Abstract:

In the age of global communications, heterogeneous networks are seen to be the best choice of strategy to ensure continuous and uninterruptible services. This will allow mobile terminal to stay in connection even they are migrating into different segment coverage through the handoff process. With the increase of teletraffic demands in mobile cellular system, hierarchical cellular systems have been adopted extensively for more efficient channel utilization and better QoS (Quality of Service). This paper presents a bidirectional call overflow scheme between two layers of microcells and macrocells, where handoffs are decided by the velocity of mobile making the call. To ensure that handoff calls are given higher priorities, it is assumed that guard channels are assigned in both macrocells and microcells. A hysteresis value introduced in mobile velocity is used to allow mobile roam in the same cell if its velocity changes back within the set threshold values. By doing this the number of handoffs is reduced thereby reducing the processing overhead and enhancing the quality of service to the end user.

Keywords: Hierarchical cellular systems, hysteresis, overflow, threshold.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1081015

References:

[1] T.S. Rappaport, Wireless Communications Principles and practice. Prentice Hall, 1996.
[2] V.R. Kolavennu and S.S. Rappaport, "Traffic Performance Characterization of a Personal Radio Communication System," IEE Proc. Comm., vol. 133F, pp. 550-561, Oct. 1986.
[3] C.L. I, L.J. Greenstein, and R.D. Gitlin, "A Microcell/Macrocell Cellular Architecture for Low and High-Mobility Wireless User," IEEE J. Selected Areas Comm., vol. 11, pp. 885-891, Aug. 1993.
[4] M. Murata and E. Nakano, "Enhancing the Performance of Mobile Communications System," Proc. IEEE Int-l Conf. Universal Personal Comm. (ICUPC -93), pp. 732-736, 1993.
[5] W. Huang and V.K. Bhargava, "Effects of User Mobility on Handoff Performance in a Hierarchical Cellular System," Proc. Canadian Conf. Electrical and Computer Eng. (CCECE -95), pp. 551-554, 1993.
[6] K.R. Lo, C.J. Chang, C. Chang, and C.B. Shung, "A QoS Guaranteed Fuzzy Channel Allocation Controller for Hierarchical Cellular Systems," IEEE Trans. Vehicular Technology, vol. 49, pp. 1588- 1597, Sept. 2000.
[7] K. Shum and C.W. Sung, "Fuzzy Layer Selection Method in Hierarchical Cellular Systems," IEEE Trans. Vehicular Technology, vol. 48, pp. 1840-1849, Nov. 1999.
[8] Wenhao Shan, Pingzhi Fan, and Yi Pan, "Performance Evaluation of a Hierarchical Cellular System with Mobile Velocity-Based Bidirectional Call-Overflow Scheme IEEE Trans. on parallel and distributed systems, vol. 14, No. 1, pp 72-83, Jan 2003.
[9] G. M. Mir, N. A. Shah, "Realization of QoS in Handoffs by hysteresis using Fuzzy Logic" Journal of Mass Communicator, vol 2, issue 2, pp 13-20, June 2008.
[10] G. M. Mir, N. A. Shah, Moinuddin, "Decentralized Handoff for Microcellular Mobile Communication System using Fuzzy Logic" World Acadamy of Science, Engineering and Technology, vol 50, pp 866-870, Feb 2009.
[11] S.S. Rappaport and L.R. Hu, "Microcellular Communication Systems with Reneging and Dropping for Waiting New and Handoff Calls," Proc. IEEE, vol. 82, pp. 1383-1397, Sept. 1994.
[12] S.S. Rappaport and L.R. Hu, "Personal Communication Systems Using Multiple Hierarchical Cellular Overlays," IEEE J. Selected Areas Comm., vol. 13, pp. 406-415, May 1995.