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Student projects


Optimal placement of anchor points in telecommunication networks - I-MPLS as an example of use

Kind of work:
Diploma Thesis
Dipl.-Ing. René Böringer
Florian Liers
The growing number of users of mobile communication systems and increasing requirements for the quality of service of wireless access networks requires an efficient mobility management within the network. This is especially true for packet switched networks serving and managing a high number of mobile equipment permanently connected. A suitable placement of the mobility functionality within a wireless access network accelerates the signalling process in case of handovers. This reduces the probability for loosing packets. However the micro mobility components, refered to as anchor points, slow down the regular packet forwarding. First of all this increases the delay of the user traffic and secondly it slows down the signalling process for the
handovers, which does not participate on the gain of the micro mobility functionality.
This Diplomarbeit presents a method, which allows the calculation of an optimal placement of the micro mobility functionality within an existing telecommunication network. The model bases on the topology of the network and its traffic data. The optimisation considers the durations of the signalling processes and the delay of the user traffic. The whole optimisation process was automated for the optimisation tool TRIAS from IDEO Laboratories and is particularly applicable for large telecommunication networks. Real access networks with more than 350 nodes are used to demonstrate the applicability. The validation of the optimisation was done with the network simulator NS2 and the new micro mobility protocol I-MPLS. Additionally the Diplomarbeit analyses the sensibility of the optimal result concerning the variation of the traffic data and the optimisation parameter. Based on the asserted importance of such an analysis, local and global sensibility measurements are presented.