PDCCH Transmission Beam Alignment via Candidate Mode Selection
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Solution Overview
Problem
The success rate of receiving a physical downlink control channel is relatively low in high-frequency 5G communication systems due to misalignment of transmitting and receiving beams, which affects the performance and can cause network failures.
Innovation Solution
A method where a communication node determines an actual transmitting mode set from a candidate set based on the working state and feedback information of the receiving node, selecting the most suitable beams to improve alignment and transmission success, thereby enhancing the success rate of demodulation of the physical downlink control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming method is adopted to improve antenna gains, then coverage performance is improved, but beam alignment difficulty increases
Solution Approach 1:
The base station performs preliminary beam training by transmitting downlink beam training reference signals through multiple candidate beams before actual data transmission. The terminal measures these signals and feeds back beam measurement information, allowing the system to pre-determine optimal beam pairs for subsequent PDCCH transmission, thus avoiding real-time alignment difficulties.
Solution Approach 2:
The terminal measures downlink beam training reference signals and feeds back beam measurement information including beam indices and signal quality metrics to the base station. This feedback mechanism enables the base station to identify the best beam pairs and adjust beamforming parameters accordingly, resolving alignment issues through iterative optimization.
2Reliability
If multiple antenna elements are used to improve beamforming gain, then coverage performance is improved, but system complexity increases
Solution Approach 1:
The system segments the beamforming process into distinct phases: downlink beam training phase where multiple candidate beams are transmitted, measurement phase where the terminal evaluates signal quality, and feedback phase where optimal beam information is reported. This segmentation allows complex multi-antenna operations to be managed through structured, manageable steps.
Solution Approach 2:
The beamforming system dynamically adapts to channel conditions by continuously performing beam training and updating beam pairs based on terminal feedback. The base station can switch between different beam configurations depending on terminal mobility and channel state, making the complex multi-antenna system flexible and responsive rather than static and rigid.
Data Source
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AI summary
Provided are a method and apparatus for transmitting a physical downlink control channel, and a base station and a terminal. The transmission method comprises: a first communication node, based on a set of candidate sending modes, determining a set of actual sending modes, wherein the set of candidate sending modes contains X sending modes, X being an integer greater than or equal to 1; and the set of actual sending modes contains Y sending modes, Y being an integer greater than or equal to 1 and not greater than X; and the first communication node, according to the set of actual sending modes, sending a physical downlink control channel to a second communication node. The present invention solves the technical problem in the relevant art that the success rate of a receiving end receiving the physical downlink control channel is relatively low.