PDCCH Candidate Combining Across Scheduling Periods
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Solution Overview
Problem
Current methods for improving PDCCH decoding reliability and communication quality in ultra-reliable low-latency communication scenarios are inadequate, as directly increasing coding or processing gain does not effectively enhance transmission reliability.
Innovation Solution
A radio communication method that involves obtaining and combining candidate downlink control channels across multiple scheduling periods, using preconfigured or network-provided information to align sequence numbers and aggregation levels, thereby reducing the number of attempts required for decoding and enhancing decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If directly increasing coding gain or processing gain (using high aggregation level) of PDCCH is used to improve transmission reliability, then reliability is improved, but latency increases and it becomes an ineffective method
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate PDCCH channels across different scheduling periods and their corresponding relationships before transmission occurs. The network device and terminal device both prepare the candidate channel sets and their mappings in advance, so when channel quality deteriorates, the terminal can immediately switch to using multiple candidates for combining without requiring real-time computation or reconfiguration, thus improving reliability while avoiding latency increase.
2Reliability
If multiple candidate downlink control channels are combined and decoded to improve decoding reliability, then decoding reliability is improved, but the number of decoding attempts increases reducing efficiency
Solution Approach 1:
The patent reduces the number of decoding attempts by pre-establishing the correspondence relationships between candidate PDCCH channels in different scheduling periods. The terminal device uses these pre-configured mappings to directly identify which candidate channels to combine, avoiding the need to attempt decoding of all possible candidate combinations. This selective combining approach maintains high decoding reliability while significantly improving decoding efficiency.
3Reliability
If candidate downlink control channels are obtained and combined across multiple scheduling periods, then decoding probability is improved, but system complexity increases
Solution Approach 1:
The patent manages system complexity by pre-configuring all necessary information about candidate PDCCH channels including their sequences, aggregation levels, and inter-period correspondences. Both network and terminal devices maintain these configurations, eliminating the need for complex real-time channel estimation and candidate identification algorithms. The pre-established mappings enable straightforward channel combining operations while keeping system complexity manageable.
Data Source
AI summary
A radio communication method, and apparatus are provided. The method includes: obtaining, in a second scheduling period based on a first candidate downlink control channel, a second candidate downlink control channel from a control resource set corresponding to the second scheduling period, the first candidate downlink control channel and the second candidate downlink control channel comprise the same downlink control information, a correspondence exists between a first aggregation level of the first candidate downlink control channel and a second aggregation level of the second candidate downlink control channel, and an offset exists between a sequence number of the second candidate downlink control channel and a sequence number of the first candidate downlink control channel; and combining and decoding the first candidate downlink control channel and the second candidate downlink control channel.