Network densification is widely accepted as one of the solutions that will allow to meet the 1000x capacity challenge in future generation cellular networks. Small Cell Networks allow higher spatial reuse and so higher area spectral efficiency. However, mobility issues appear and handover robustness deteriorates for users at moderate speed, which translates into connection dropping and throughput degradation. In order to overcome these problems, this paper proposes a new scheme based on Cooperative Multi-Point combined with dual connectivity with control and user plane split. Results show a decrease in frequent handover failures and the corresponding throughput gains. Thus, the integration of these users into the small cell tier would be a feasible option.Peer ReviewedPostprint (published version
This paper deals with mobility robustness in a context of ultra-dense deployments operating at the millimeter wave (mmW) band. In order to increase the threshold speed of user equipments (UEs) allowed at the small cell layer, we propose the use of selective Control/User-plane split combined with a noncoherent cooperative multi-point (CoMP) joint transmission (JT). This way, users at moderate speeds can also benefit from the new cell layer and improve their performance with respect to a pure macrocellular operation. The combination of this strategy with a fine tuning of the measurement gap interval allows reducing handover failure rates, which eventually translates into a throughput improvement. On the other hand, increasing the number of measurements leads to a higher UE power consumption, fact that has also been quantified and evaluated.
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