Downlink Control Channel Symbol Mapping for Nested Aggregation Levels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the existing techniques for transmitting downlink control information in a search space using different aggregation levels are deficient, leading to ambiguity and incorrect identification by user equipment (UE), resulting in reduced throughput due to nested aggregation levels where control information is mistakenly identified as being transmitted using a different aggregation level.
Innovation Solution
The method involves mapping modulated control symbols to resource element groups (REGs) or resource elements (REs) differently based on the aggregation level, including interleaving and out-of-order mapping for various aggregation levels, to ensure correct identification of the control channel by the UE, even when aggregation levels are nested.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same mapping method is used for all aggregation levels, then the implementation is simple, but the user equipment cannot correctly identify the control channel when aggregation levels are nested
Solution Approach 1:
The patent applies local quality by using different mapping methods for different aggregation levels. Specifically, aggregation level 1 uses a first mapping method while aggregation levels 2, 4, and 8 use a second mapping method. This allows the system to optimize for control channel identification accuracy in nested scenarios without requiring all aggregation levels to use complex differentiating mappings, thus resolving the contradiction between reliability and complexity.
2Reliability
If different mapping methods are used for all aggregation levels to prevent ambiguity, then the control channel identification accuracy improves, but the implementation complexity increases
Solution Approach 1:
The patent implements local quality by applying different mapping strategies to different aggregation levels based on their specific needs. Aggregation level 1 uses a first mapping method while levels 2, 4, and 8 use a second mapping method. This targeted approach prevents ambiguity in nested aggregation level scenarios without requiring all levels to use complex differentiated mappings, thus resolving the contradiction between reliability and complexity.
3Adaptability or versatility
If nested aggregation levels are supported, then the system flexibility improves, but the user equipment may mistakenly identify control information transmitted at one aggregation level as being transmitted at another aggregation level
Solution Approach 1:
The patent resolves this contradiction by applying different mapping methods to different aggregation levels. Aggregation level 1 uses a first mapping method while levels 2, 4, and 8 use a second mapping method. This allows the system to maintain flexibility in supporting nested aggregation levels while preventing misidentification through localized mapping differentiation where it is most needed.
Solution Approach 2:
The patent uses mapping method differentiation as a form of 'color change' to distinguish between aggregation levels. By assigning different mapping patterns (analogous to different colors) to different aggregation levels, the system enables user equipment to reliably identify the correct aggregation level even when nested levels are present, thus maintaining both flexibility and reliability.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communication are described. An apparatus for wireless communication may receive a plurality of modulated control symbols over interleaved resources of an aggregation level candidate on a downlink control channel, de-interleave the resources based at least in part on an aggregation level associated with the downlink control channel, and decode the plurality of modulated control symbols into control information. Alternatively, the apparatus for wireless communication may receive a plurality of modulated control symbols interleaved over resources of an aggregation level candidate on a downlink control channel, de-interleave the plurality of modulated control symbols based at least in part on an aggregation level associated with the downlink control channel, and decode the plurality of modulated control symbols into control information.