A method for physical cell identification planning

Abstract

The present application discloses a method for planning a physical cell identity, including: A. Obtaining an allocatable PCI set S0; wherein, any two adjacent same-frequency cells cannot use the same PCI; and all adjacent cells of a cell No two same-frequency cells can use the same PCI; B. Use the PCI group allocation method to obtain PCIs that meet the principles of "different PCI modulo 3 results in co-sited cells" and "as different as possible PCI modulo 3 / 6 results in neighboring cells" Set S1; C, take the intersection of S0 and S1 as the available PCI value. By applying the technical solution of the present application, the current cell can be assigned a PCI number different from that of the adjacent cell modulo 3 / 6 as far as possible, so as to reduce co-channel interference of edge users.

Description

technical field [0001] The present application relates to the technical field of mobile communication, and in particular to a method for planning a Physical Cell Identifier (PCI, Physical Cell Identifier). Background technique [0002] The Physical Cell Identifier (PCI, Physical Cell Identifier) ​​is a key parameter in the Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network). In the E-UTRAN system, in order to avoid inter-cell interference and the base station (eNodeB) can correctly identify each neighboring cell, each cell can be configured with a different PCI. In the protocol specification, a total of 504 PCIs are defined. These PCIs can be divided into 168 unique physical cell identification groups, and each group contains 3 unique intra-group identifications. Therefore, a PCI can be uniquely defined by a number (ranging from 0 to 167) representing a physical cell identification group and a number (ranging fro...

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Problems solved by technology

[0009] The existing PCI allocation algorithm only follows the principles of "no conflict" and "no confusion", but does not consider the principle that the PCI modules 3 of the co-sited cells are different and the PCI modules 3 / 6 of the adjacent cells are as different as possible, which will interfere with the cell interference coordination algorithm, Negative effects brought by scheduling algorithms, etc., thus affecting system performance

For example, there are six frequency domain positions for reference signals, and the frequency offset is related to the PCI modulo 6 value. If the PCI value modulo 6 adopted by neighboring cells is the same, it will cause serious mutual interference between reference signals between neighboring cells, thus affecting the system. performance

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