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As mobile cellular radio systems evolve into personal communications, a mixed cell architecture is introduced to successfully meet the increasing user capacity requirements and to preserve the system integrity. Cells of different sizes co-exist in a two-layer structure comprising: micro cells on the lower layer and macro (umbrella) cells on the upper layer. This paper reports on a mobile speed sensitive handover criterion, which allows sufficient differentiation between slow and fast-moving mobiles in a mixed cell environment. Based upon this criterion, handovers from umbrella into micro cells can be avoided for fast moving mobiles. Correspondingly, slow-moving subscribers are "dropped" from the umbrella into an underlaid micro cell and remain served by the micro-cell-layer, while those who tend to increase their speed over a given threshold are "steered" towards the umbrella-cell-layer. The new technique is compared with a standard handover strategy by means of emulations on measured propagation data in different deployment scenarios. The results indicate that utilizing the mobile speed sensitive handover in a mixed cell environment, the system performance can be significantly improved with respect to both handover load in the fixed network and forced call terminations.
Ivanov et al. (Tue,) studied this question.