PDCCH Candidate Configuration for Multi-Cell Signal Monitoring
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently monitoring control signals, particularly in scenarios involving multiple cells and diverse spectrum configurations.
Innovation Solution
A method and apparatus for monitoring control signals in a wireless communication system, involving the configuration of search space sets with defined numbers of physical downlink control channel (PDCCH) candidates for each control channel element (CCE) aggregation level, and the use of multi-cell scheduling DCI to efficiently manage PDCCH monitoring across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of PDCCH candidates is increased to improve control signal monitoring reliability, then the reliability of control signal reception is improved, but the complexity of the monitoring device and processing overhead increase
Solution Approach 1:
The patent segments the control signal monitoring by dividing PDCCH candidates into different aggregation levels (AL0, AL1, AL2, AL4) with different numbers of CCEs. This segmentation allows the system to monitor multiple candidates efficiently by organizing them in a hierarchical structure, improving reliability without linearly increasing overall complexity.
Solution Approach 2:
The patent implements dynamic adjustment of PDCCH candidate configurations based on channel conditions and traffic requirements. The network can dynamically configure the number of candidates at each aggregation level, allowing the system to adapt monitoring complexity to actual needs, thus improving reliability when necessary while reducing complexity when conditions permit.
2Productivity
If multi-cell scheduling is implemented to improve resource utilization efficiency, then the productivity of the wireless communication system is improved, but the complexity of signal monitoring and processing increases
Solution Approach 1:
The patent implements multi-cell scheduling where a single PDCCH can schedule multiple cells simultaneously. This multi-functionality allows one control channel to perform multiple scheduling tasks across different cells, improving resource utilization efficiency while the structured aggregation level approach keeps monitoring complexity manageable through organized candidate selection.
Solution Approach 2:
The patent extends the monitoring framework to multiple cells by adding a cell dimension to the existing aggregation level structure. PDCCH candidates are configured across multiple cells with different aggregation levels, allowing the system to monitor control signals in a multi-dimensional space (cells × aggregation levels) efficiently, improving productivity without overwhelming complexity.
3Measurement precision
If PDCCH candidates are monitored across multiple aggregation levels to improve detection accuracy, then the measurement precision of control signal detection is improved, but the loss of time for processing increases
Solution Approach 1:
The patent performs preliminary configuration of PDCCH candidates at different aggregation levels before actual data transmission. The network pre-configures the number of candidates at each aggregation level based on expected channel conditions and QoS requirements, so that during actual operation, the UE can quickly monitor pre-defined candidates without performing complex real-time analysis, thus improving detection accuracy while minimizing processing time.
Solution Approach 2:
The patent changes the parameter of aggregation level (number of CCEs per candidate) to balance detection accuracy and processing time. By configuring different numbers of candidates at different aggregation levels (e.g., fewer candidates at AL4 with more CCEs, more candidates at AL0 with fewer CCEs), the system optimizes the trade-off between detection precision and processing speed according to channel conditions and traffic priorities.
Data Source
AI summary
A method and device for monitoring signals in a wireless communication system disclosed in the present application can monitor a PDCCH candidate for a DCI format on the basis of a search space set configuration. The DCI format is monitored on a scheduling cell and schedules PDSCHs or PUSCHs on a plurality of scheduled cells.