Nested PDCCH Candidate Set for 5G Control Channel Efficiency
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Solution Overview
Problem
Current solutions for determining a PDCCH search space in 5G systems fail to effectively design downlink control channel resource sets with nested aggregation levels, leading to inefficiencies in control information transmission.
Innovation Solution
The method involves determining a control channel candidate set by an access network device or terminal device, which includes control channel candidates with multiple aggregation levels, ensuring that the candidates are contained within a control channel element set that supports the maximum aggregation level, allowing for efficient control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH candidates of different aggregation levels are designed in a nested manner within a control channel element set, then resource utilization efficiency is improved and collisions are reduced, but the complexity of determining and managing control channel candidate sets increases
Solution Approach 1:
The patent applies nesting by designing control channel candidates of different aggregation levels (AL1, AL2, AL4, AL8) within a nested structure where lower aggregation level candidates are contained within the resource elements of higher aggregation level candidates. This allows efficient resource utilization where a single control channel element set can support multiple aggregation levels simultaneously, improving transmission efficiency while managing complexity through structured organization.
Solution Approach 2:
The patent segments the control channel element set into multiple control channel candidates, each corresponding to a specific aggregation level. By dividing the control channel resources into distinct candidate sets with different aggregation levels (AL1, AL2, AL4, AL8), the system enables selective transmission based on channel conditions while maintaining an organized structure that manages the complexity of handling multiple aggregation levels.
2Adaptability or versatility
If multiple control channel candidates with different aggregation levels are included in a control channel element set, then adaptability to different channel conditions is improved, but the quantity of control channel elements required increases
Solution Approach 1:
The patent implements multi-functionality by designing a control channel element set that can simultaneously support multiple aggregation levels (AL1, AL2, AL4, AL8) within the same resource structure. This universal design allows the system to adapt to different channel conditions by selecting appropriate aggregation levels without requiring separate resource sets for each aggregation level, thereby maintaining adaptability while controlling the quantity of control channel elements required.
Solution Approach 2:
By nesting lower aggregation level candidates within higher aggregation level candidate structures, the patent enables a single control channel element set to serve multiple functions across different aggregation levels. This nesting approach allows efficient resource sharing where the same control channel elements can be used for different aggregation levels depending on channel conditions, reducing the total quantity of control channel elements needed while maintaining versatility.
Data Source
AI summary
Embodiments of the present disclosure provide control information sending methods, control information receiving methods, and devices. The sending method may include determining, by an access network device, a control channel candidate set corresponding to a terminal device, where the control channel candidate set includes at least one control channel candidate, the at least one control channel candidate includes at least one control channel element, the control channel candidate set is contained in at least one control channel element set, a quantity of control channel elements contained in the control channel element set is greater than or equal to a quantity of control channel elements corresponding to a maximum aggregation level supported by the terminal device. The sending method may further includes sending, by the access network device, control information to the terminal device by using at least one control channel candidate in the control channel candidate set. The control information sending method of the embodiments of the present invention can satisfy requirements of new generation radio communications systems.