CCE to REG Mapping in Control Resource Sets
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Solution Overview
Problem
In LTE systems, determining the mapping relationship between a Physical Downlink Control Channel (PDCCH) and Resource Element Groups (REGs) incurs delays due to the small granularity of Resource Elements (REs) in Resource Element Groups, requiring multiple Control Channel Elements (CCEs) and REGs to be determined, which increases processing time.
Innovation Solution
A communication method that receives configuration information for a control resource set with mapping manner information, allowing for localized or distributed mapping between CCEs and REGs, where REGs occupy one symbol in time domain and one resource block in frequency domain, reducing the granularity-based delays by using a coarser mapping granularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the REG granularity is kept small (4 or 6 REs) as defined in prior art, then the resource allocation precision is improved, but the processing delay increases due to requiring multiple CCEs and REGs to be determined
Solution Approach 1:
The patent divides the control resource set into multiple control resource sets grouped by timing, where each group contains multiple CCEs. This segmentation allows the terminal to determine the mapping relationship at the group level rather than at the individual REG level, reducing processing delay while maintaining resource allocation precision through the structured organization of CCEs and REGs within each group.
Solution Approach 2:
The patent introduces a new dimension of organization by grouping CCEs into control resource sets with specific timing relationships. Instead of processing REGs individually in the time-frequency plane, the system organizes them into groups that can be processed as units, adding a grouping dimension that reduces processing complexity and delay while preserving the fine-grained REG structure for precise resource allocation.
2Reliability
If multiple CCEs and REGs are determined to transmit PDCCH, then the transmission reliability is improved, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary organization of CCEs into control resource sets with defined timing relationships before PDCCH transmission. By pre-grouping CCEs and establishing their mapping relationships in advance, the system reduces the real-time processing complexity while maintaining the use of multiple CCEs and REGs for reliable PDCCH transmission. The terminal can efficiently determine the mapping relationship at the group level rather than individually processing each CCE and REG.
3Speed
If the REG occupies one symbol in time domain and one resource block in frequency domain with coarser granularity, then the processing speed is improved, but the resource allocation flexibility is reduced
Solution Approach 1:
The patent segments the control resource set into multiple control resource sets grouped by timing, where each group contains multiple CCEs that are further divided into REGs. This hierarchical segmentation allows the system to process at the coarser CCE group level for speed while maintaining the finer REG level for flexible resource allocation. The multi-level structure enables both fast processing and adaptable resource distribution.
Solution Approach 2:
The patent introduces dynamic grouping of CCEs into control resource sets based on timing relationships. The grouping structure can be flexibly configured to adapt to different transmission scenarios while maintaining the coarser granularity benefit for processing speed. The dynamic organization allows the system to adjust the number and size of control resource sets based on traffic conditions, balancing processing speed and resource allocation flexibility.
Data Source
AI summary
Example communication methods and apparatus are described. In one example method, a terminal device receives configuration information of a first control resource set, where the configuration information of the first control resource set comprises mapping manner information of the first control resource set. The terminal device determines, based on the mapping manner information, a mapping manner between a control channel element (CCE) and resource element groups (REGs) in the first control resource set, where a REG in the first control resource set occupies one symbol in time domain and one resource block (RB) in frequency domain, and REGs in the first control resource set are numbered in a time-first manner. The mapping manner information indicates that the mapping manner is interleaved mapping.