PDCCH Resource Allocation via Aggregation Degree Grouping
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Solution Overview
Problem
The existing resource allocation scheme for the Physical Downlink Control Channel (PDCCH) in LTE systems is complex, leading to low efficiency and increased complexity for both base stations and user equipment, affecting decoding rates and overall system flow.
Innovation Solution
The method involves calculating PDCCH aggregation degree groups based on available CCE resources, setting a common search space, and using a space division function to determine UE-specific search spaces for resource allocation, simplifying the allocation process and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resource allocation is performed by taking one CCE as the unit with full re-calculation in different TTI, then resource allocation flexibility is maintained, but resource allocation efficiency decreases and complexity increases
Solution Approach 1:
The patent segments CCE resources into aggregation degree groups where CCEs with the same aggregation degree are grouped together. This segmentation allows the system to handle resources in manageable units rather than individually processing each CCE, thereby improving allocation efficiency while maintaining flexibility through the grouped structure.
Solution Approach 2:
The patent performs preliminary classification of CCEs into aggregation degree groups before actual resource allocation. By pre-organizing resources according to their aggregation degrees, the system avoids full re-calculation in different TTI and reduces computational complexity while preserving allocation flexibility.
2Measurement precision
If full re-calculation of resource allocation is performed in different TTI, then resource allocation accuracy is maintained, but base station processing complexity increases
Solution Approach 1:
By segmenting CCEs into aggregation degree groups, the patent reduces the scope of re-calculation needed in different TTI. Instead of recalculating for all CCEs individually, the system only needs to update the grouped structures, significantly reducing base station processing complexity while maintaining allocation accuracy.
Solution Approach 2:
The patent discards the need for full re-calculation by maintaining the aggregation degree group structure across different TTI. The system recovers efficiency by reusing the grouped organization and only performing necessary updates, thereby reducing processing complexity while preserving accuracy.
3Reliability
If UE performs blind detection by taking CCE as the basic unit, then control information detection capability is maintained, but detection times increase
Solution Approach 1:
The patent segments the search space into aggregation degree groups, allowing UE to perform blind detection on groups rather than individual CCEs. This segmentation reduces the number of detection attempts needed while maintaining the ability to detect control information reliably.
Solution Approach 2:
By pre-organizing CCEs into aggregation degree groups and notifying UE of the search space location, the patent enables UE to perform blind detection more efficiently. The preliminary grouping reduces the search space and detection times while maintaining detection capability.
4Measurement precision
If search location is re-calculated in different TTI, then detection accuracy is maintained, but UE processing complexity increases
Solution Approach 1:
The patent performs preliminary determination of the search space location based on aggregation degree groups and notifies UE in advance. This preliminary action eliminates the need for UE to re-calculate search locations in different TTI, reducing UE processing complexity while maintaining detection accuracy through the structured group organization.
Data Source
AI summary
The invention discloses a method for allocating resource including: a base station calculating a number of PDCCH aggregation degree groups based on CCE resources which can be occupied by PDCCH in a subframe, wherein PDCCH aggregation degree groups are divided based on a largest PDCCH aggregation degree; the base station setting at least one aggregation degree group in the middle of the total PDCCH aggregation degree groups as a common search space; and the base station, based on UE information and common information, determining PDCCH aggregation degree groups which are set as a UE specified search space using a space division function; and the base station searching a location of the UE specified search space in determined PDCCH aggregation degree groups which are set as the UE specified search space and performing PDCCH resource allocation. The invention achieves simplification of allocation modes and improves efficiency of PDCCH resource allocation.