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Method and device for allocating CRS (Cell Reference Signal)

A cell-specific reference and configuration method technology, which is applied in the field of cell-specific reference signal configuration, can solve problems such as co-channel interference, and achieve the effects of reducing co-channel interference and improving downlink performance.

Inactive Publication Date: 2012-12-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present invention provides a cell-specific reference signal configuration method and device to solve the problem of co-channel interference generated by the existing CRS on dedicated channels and common channels of the same symbol in adjacent cells

Method used

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  • Method and device for allocating CRS (Cell Reference Signal)
  • Method and device for allocating CRS (Cell Reference Signal)
  • Method and device for allocating CRS (Cell Reference Signal)

Examples

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Effect test

example 1

[0064] In the first example, the transmission resources are divided based on the frequency domain.

[0065] The specific configuration process is as follows:

[0066] Assuming that the frequency band bandwidth of the LTE cell is 20 MHz, 100 RBs (Resource Block, resource block) are available, that is, 1200 REs. Conventional cyclic prefix (Cyclic Prefix, CP), the base station antenna is 2 antennas, and the maximum transmission power is 40W, which is 46dBm;

[0067] Before implementing ICIC, it is assumed that the reference power EPRE of the energy of a CRS single resource unit (CRS-RE) is 12dBm, and the ratio of the power of PDSCH-RE to the reference power of CRS-RE is set to 0dB, which is equal to 12dBm. In this way, PDSCH and the same The total power of the CRS of the symbol is: 12+10*Log1200=42.79dBm, which is less than the set maximum power of the cell 46dBm, and no power overload will occur;

[0068] Implement ICIC to divide the cell into a central area and an edge area. ...

example 2

[0074] In the second example, transmission resources are divided based on the time domain.

[0075] The specific configuration process is as follows:

[0076] Assuming that the frequency band bandwidth of the LTE cell is 20 MHz, 100 resource blocks (Resource Block, RB) are available, that is, 1200 REs. Conventional cyclic prefix (Cyclic Prefix, CP), the base station antenna is 2 antennas, and the maximum transmission power is 40W, that is, 46dBm.

[0077] If it is frequency division duplex (Frequency Division Duplex, FDD) LTE, there are 10 downlink wireless subframes (Sub Frame, SF) in a downlink wireless frame: SF0 ~ SF9, if it is time division duplex (Time Division Duplex, TDD) mode of LTE, assuming that the uplink and downlink configuration is 1, there are 6 downlink subframes in a wireless frame: SF0, SF1, SF4, SF5, SF6, SF9, and 4 uplink subframes: SF2, SF3, SF7, SF8. The following steps take FDD as an example (TDD downlink SF is less, and the implementation of time-do...

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Abstract

The invention discloses a method and a device for allocating a CRS (Cell Reference Signal). The method comprises the following steps of dividing a cell into a center area and an edge area; dividing the CRS into a center CRS, an edge CRS and a public CRS; increasing a fixed first power value on the basis of set reference EPRE (Energy per Resource Element), and allocating the first power value to be an EPRE value of the edge CRS; reducing a fixed second power value on the basis of set reference EPRE, and allocating the second power value to be an EPRE value of the center CRS; and allocating the reference EPRE into the EPRE value of the public CRS. According to the method and the device, disclosed by the invention, the power of the edge CRS of the cell is increased as possible on the premise without affecting the performance of the center CRS, the same frequency interference between the edge area and a neighbor cell channel is reduced, and the downlink function of the edge area of the cell is increased.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a cell-specific reference signal (CRS) configuration method and device. Background technique [0002] A reference signal (Reference Signal, RS) in a fourth-generation mobile communication Long Term Evolution (LTE) system is a pilot signal known by a receiving end, and is used by the receiving end for channel estimation and correlation measurement. It plays a very important role in the demodulation of received signals, interference cancellation, improvement of Signal Interference Noise Ratio (SINR), cell reselection and handover of user equipment (User Equipment, UE, also known as terminal). [0003] There are many kinds of RS in LTE. Among them, the cell-specific reference signal (Cell-Specific RS, CRS) sent by the LTE base station eNB (Evolved NodeB) to the UE is a continuous broadcast by the cell for all UEs in the cell to downlink to the cell. A common reference si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04W36/00H04W52/34
CPCH04L5/0053H04W36/00H04L27/2613H04W52/325H04W52/34H04W52/143H04W52/283H04W52/16H04W16/14H04L5/005
Inventor 刘学斌李廉董晖
Owner ZTE CORP
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