Automatic Distributing Schemes of Physical Cell Identity for Self-Organizing Networks

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In this paper, the authors present and put forward an optimal Automatic Distributing of Physical Cell Identity (ADPCI) scheme for the Self-Organizing Network (SON). Considering the high number and the layered structure of the evolved node B (eNodeB, eNB) in the initial rollout phase, the assigning of PCI for cells would be quite complex. The PCI self-distributing problem is mapped to the well-known Minimum Spanning Tree (MST) problem in order to optimize the PCI reuse distance and decrease the multiplexing interference. The correlation property of PCI is analyzed and taken into consideration in the assigning phase. Moreover, a suboptimal algorithm (SADPCI) is presented as it performs approximately to ADPCI but the computational complexity is lower.