Optimum Mirror-HLR locations to reduce signalling load in cellular radio networks


R. Mathar, M. Hellebrandt,


        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 number of signalling messages and database accesses 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.

BibTEX Reference Entry 

	author = {Rudolf Mathar and Martin Hellebrandt},
	title = "Optimum Mirror-HLR locations to reduce signalling load in cellular radio networks",
	pages = "139-150",
	publisher = "Kluwer",
	series = "Multiaccess, Mobility and Teletraffic, Advances in Wireless Networks",
	editor = "D. Everitt, M. Rumsewicz",
	address = "Boston",
	year = 1998,


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