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By Hossam Afifi; Djamal Zeghlache

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The profile is regularly updated because due to the temporary situation the movement of the users may divert from the regular. So the algorithm can dynamically change the predicted path stored for the users. g. a corridor) or only a few. The prediction we make can be valid for a longer period than one next cell, but of course this can be altered if something unexpected occurs. 2. Simulation results The test area was a random generated area of 28 network nodes and 7 base stations. The probability of movement between the nodes is randomly defined.

From the broadcast channels available in the cell, the RNC broadcasts also its identity. One of the most important elements in IGPRS is that the terminal learns its routing prefix from this broadcast. This saves bandwidth and time. 3. Routing area update procedure This procedure happens regularly to refresh the routing and authentication cash entry of the terminal in the RNC and AAAF. It happens also when the terminal discovers that it is landing on a new routing area. This is learnt from the broadcast channel.

Qualitative comparison of the different methods The algorithms mentioned above can be compared in terms of many parameters. We selected five parameters describing the main characteristics of the presented methods. 1. Basic parameters for comparison Channel efficiency One parameter can be the channel efficiency (CE), the average channels reserved for the communication during the call. If we do not assign the channel before the handover (this is the method which we use for the base of comparison) this value is 1 for LP, UC, VCT, SC and the routing algorithm presented in Section 5.

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