A method and device for allocating scrambling codes
A code allocation and scrambling technology, applied in the field of scrambling code allocation methods and devices, can solve problems affecting baseband physical layer demodulation performance, co-channel interference, and link performance deterioration
Active Publication Date: 2018-05-01
SHANGHAI DATANG MOBILE COMM EQUIP +1
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Problems solved by technology
[0004] The existing scrambling code allocation method is to determine the set of neighboring cells based on the neighbor cell relationship, and select the optimal scrambling code according to the avoidance principle of scrambling code allocation. The probability of code coincidence is high
If the composite codes of cell 1 and cell 2 overlap, and the distance between the terminals in cell 1 and the terminals in cell 2 is relatively close, it may not be possible to distinguish the two channels of data. large co-channel interference
When the co-channel interference between adjacent cells is large enough to affect the demodulation performance of the baseband physical layer, it will cause the deterioration of link performance and thus affect the capacity of the system
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[0111] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0112] In order to better explain the present invention, the present invention is described below using specific embodiments, all processes in the following embodiments of the present invention are all implemented in the TD-SCDMA communication system, only for illustration purposes, the present invention The embodiments are not limited thereto, and the following embodiments can also be implemented in a communication system.
[0113] The 128...
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The invention discloses a scrambling code allocation method and device. The method includes determining a scrambling code cell to be allocated according to the scrambling code planning sequence of the cells, and planning an avoidance principle according to the set scrambling code plan and the scrambling code cell to be allocated. Neighboring cell relationship, determine the optimal candidate scrambling code for the cell to be allocated scrambling code, and allocate the optimal candidate scrambling code to the cell to be allocated scrambling code, if there are multiple optimal candidate scrambling codes , then according to the correlation measurement value between the optimal candidate scrambling code and the scrambling code of the first circle of cells, select a candidate scrambling code from a plurality of optimal candidate scrambling codes and assign it to the to-be-allocated scrambling code cell, In order to reduce the probability of composite code coincidence after allocating scrambling codes, and reduce the co-channel interference between adjacent cells.
Description
technical field [0001] The present invention relates to the technical field of communications, and in particular to a method and device for allocating scrambling codes. Background technique [0002] Cellular mobile communication systems of different standards usually use different technical characteristic parameters to distinguish signals of adjacent cells. In the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) system, a scrambling code is used to distinguish adjacent cells of the same frequency network. [0003] The TD-SCDMA network needs to plan the downlink pilot code and scrambling code. A downlink pilot code corresponds to 4 scrambling codes, and they can be regarded as a group. When performing code planning, it is first necessary to determine the sequence number of the downlink pilot code of each logical cell in the 32 optional code groups, and then select a scrambling code for the cell from ...
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IPC IPC(8): H04J13/16
Inventor 楼小平
Owner SHANGHAI DATANG MOBILE COMM EQUIP