Optimum Mirror-HLR Locations to Reduce Signalling Load in Cellular Radio Networks
As a new policy, Mirror Home Location Registers (MHLR) are introduced to avoid expensive signalling traffic of roaming users to a far distant HLR in mobile communication networks. We investigate the question what the optimum location strategy will be. Three basic ingredients are necessary to tackle this problem: a realistic, but tractable, mobility model, a precise description of signalling costs, and an optimization method to solve the complicated minimization problems.
This paper contributes to each of these problems in the following way. An open Jackson network with customer classes is developed to describe user mobility and network flows. Then, a careful analysis of the signalling messages yields an accurate cost function. Finally, in steady state of the network, integer linear programming is used to find an optimal register allocation strategy for the so called dedicated MHLR policy, where each location area is assigned to an individual MHLR. Numerical examples show that the optimum Mirror HLR strategy clearly outperforms standard GSM signalling protocols.
KeywordsUser Mobility Integer Linear Programming Arrival Intensity Visitor Location Register Customer Class
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- R. Jain and Y. Lin, “An auxiliary user location strategy employing forwarding pointers to reduce network impacts of PCS,” Wireless Networks, pp. 197–210, 1995.Google Scholar
- A. Bondi and V. Jin, “Performance analysis of a minimally replicated database for UPT services,” in Proceedings 8th ITC Specialists Seminar on UPT, pp. 131–140, Oct. 1992.Google Scholar
- K. Leung and Y. Levy, “Use of centralized and replicated databases for global mobility management in PCN,” in Proceedings of ICUPC’96, pp. 852–859, Oct. 1996.Google Scholar
- G. Colombo, “Mobility models for mobile systems design and analysis,” in Proceedings 9th ITC Specialists Seminar, pp. 133–146, KPN Research, Leidschen-dam, 1995.Google Scholar
- M. Hellebrandt and R. Mathar, “Mobility and traffic modeling for optimum system design of cellular radio networks,” submitted for publication, 1997.Google Scholar