A method for reducing downlink control channel interference

Abstract

The invention discloses a method for reducing downlink control channel disturbance. The method includes the steps that full coverage carrier waves special for providing network coverage are configured for all sectors respectively in advance, and the full coverage carrier waves of every two adjacent sectors are different; PDCCHs on the full coverage carrier waves of all the configured sectors transmit in a normal power mode, and PDCCHs on other carrier waves except the full coverage carrier waves of all the configured sectors transmit in a power reduction mode; after edge UE gets access to a network, a network side uses the full coverage carrier waves of the sector where the edge UE is located for configuring main carrier waves for the edge UE and sets the dispatch authorization mode as a cross-carrier-wave dispatch mode; after center UE gets access to the network, the non-full coverage carrier waves of the sector where the center UE is located are used for configuring main carrier waves for the center UE, and if aggregation carrier waves of the center UE comprise the full coverage carrier waves, the adoption of cross-carrier-wave dispatch is determined according to channel quality of the aggregation carrier waves and load conditions of the PDCCHs on the full coverage carrier waves. The method can reduce PDCCH channel disturbance among cells and achieve PDCCH load balancing under the condition of not affecting a service channel coverage range.

Description

Technical field [0001] The present invention relates to mobile communication technology, in particular to a method for reducing interference of downlink control channels. Background technique [0002] In the LTE system, the Physical Down Control Channel (PDCCH, Physical Down Control Channel) is used to authorize traffic channels. In the LTE system of the same frequency network, the downlink physical control channel (PDCCH, Physical Down Control Channel) of each cell on the same frequency point occupies the same time-frequency resource for data transmission. The PDCCH of the cell edge user equipment (UE) suffers more interference. In order to take into account the demodulation performance and spectrum efficiency under different interference levels, the standard defines four control channel element (Control Channel Element, CCE) aggregation levels to transmit Downlink Control Information (DCI), respectively using 1, 2 , 4 and 8 CCEs transmit 1 DCI. The higher the aggregation lev...

AI Technical Summary

Problems solved by technology

[0006] The above solution uses cross-carrier scheduling to effectively avoid the interference between the downlink control channels of the macro base station and the Pico base station to a certain extent. Reduced power transmission is also used, so that the coverage of the service channel will be reduced, and the receiving signal-to-noise ratio (SNR) of the service channel within the coverage will also be reduced, which is not suitable for homogeneous macro base station networking scenarios

In addition, the PDCCH resource allocation of the central user in the above scheme only uses the carrier scheduling method, which is not conducive to PDCCH load balancing, and may cause the PDCCH load on the carrier that uses normal power transmission to be too heavy

[0007] It can be seen that the scheme of using cross-carrier scheduling to reduce inter-cell PDCCH channel interference has the problems of reducing the coverage of traffic channels, reducing the receiving SNR of traffic channels within the coverage area, and overloading some PDCCHs.

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