Inter-cell cell reference signal interference processing method, system and device

Abstract

The present invention discloses a CRS interference processing method, system and device between cells: for any two adjacent cells in the network where CRS positions conflict, when the DwPTS time slot in the special subframe used by one of the cells is configured as a long DwPTS Configure the DwPTS time slot in the special subframe used by another cell as a short DwPTS time slot; determine that the CRS position conflict with the adjacent cell occurs and the terminals of the cell subordinate to the long DwPTS time slot are configured to meet the requirements For the terminal, the compliance includes: being located at the edge of the cell to which it belongs and adjacent to a neighboring cell where the CRS position conflicts with the cell to which it belongs; scheduling the determined terminal to the DwPTS time slot in the special subframe used by the cell to which it belongs for data transmission. Applying the scheme of the present invention can improve the downlink performance of the system.

Description

technical field [0001] The present invention relates to wireless technology, in particular to a method, system and device for processing cell reference signal interference between cells. Background technique [0002] In a Time Division Long Term Evolution (TD-LTE, Time Division Long Term Evolution) system, a Cell-specific Reference Signal (CRS, Cell-specific Reference Signal) is an important reference signal for a terminal to perform channel estimation and data demodulation. [0003] For the currently commonly used two-antenna port system, under the normal cyclic prefix (CP, Cyclic Prefix) configuration, the CRS is located in the 1st, 5th, 8th, and 12th orthogonals of each 1ms subframe in the time domain On frequency division multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) symbols (the number of OFDM symbols starts from 1), in the frequency domain, every 3 subcarriers appear once, that is, there are 4 CRS positions in every 12 subcarriers. [0004] For the t...

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Problems solved by technology

[0004] For the terminal, if the CRS is interfered by the CRS of the adjacent cell, it will seriously affect the signal estimation and data reception performance of the terminal, thereby degrading the downlink performance of the system. Therefore, in the prior art, the CRS frequency domain shift between cells is usually used bit solution

[0005] However, due to the high density of CRS in the frequency domain in the TD-LTE system, there are only three CRS positions that can be staggered from each other at most, while in wireless networks, especially in dense urban areas, it is easy to have four or even more The phenomenon that multiple cells are adjacent, at this time, the CRS positions of two cells must not be staggered, that is, CRS position conflicts occur

like figure 1 as shown, figure 1 It is a schematic diagram of CRS location conflicts among existing cells. The CRS locations of Cell 2, Cell 3, and Cell 4 can be staggered, but the CRS locations of Cell 1 and Cell 2 cannot be staggered. As a result, CRS location conflicts occur, which leads to cell CRS interference between

[0006] It can be seen that there are still defects in the existing method, which will lead to a decrease in the downlink performance of the system

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