Method and device for planning physical cell identities

Abstract

The embodiment of the invention discloses a method and a device for planning physical cell identities (PCI), so as to avoid the PCI collision and reduce the interference of reference signals. The method of the embodiment of the invention comprises the following steps: acquiring the interference information among base stations; assigning different Vshift groups according to the interference information, i.e., assigning the corresponding Vshift to the cell in each base station; clustering the base stations according to the relation of physical positions of the base stations; assigning the PCI group to the base station in the non-multiplexing cluster and assigning the PCI to the cell in the base station; calculating the score of each PCI group, assigning the PCI group with the score thereof meeting the preset conditions to the base station in the multiplexing cluster, and assigning the PCI to the cell in the base station. The embodiment of the invention further provides a device for planning the PCI. The embodiment of the invention can effectively avoid the PCI collision and reduce the interference of the reference signals.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for planning physical cell identifiers. Background technique [0002] The cell search process of the Long Term Evolution (LTE, Long Term Evolution) network determines the use of cell identification (ID, Identity) grouping. First, the cell ID group is determined through the secondary synchronization channel, and then the specific cell ID, that is, the physical cell, is determined through the primary synchronization channel. Identification (PCI, Physical CellID). [0003] From the perspective of the ability to support multi-cell networking, the more PCIs the better, but the more PCIs require a sufficient number of high-performance secondary synchronization channel sequences to support fast and accurate PCI searches, which may greatly improve cost. Therefore, in LTE, each PCI group contains 3 PCIs, and the number of PCIs should be divisible by 3. Combined with...

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Problems solved by technology

[0010] However, in the above-mentioned prior art, only the avoidance of PCI conflicts is considered, and according to the agreement, the frequency shift of the reference signal for different antenna configurations also needs to be determined according to the PCI, which is not considered in the prior art. Therefore, it will cause interference between reference signals caused by pilot signals overlapping with each other

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