Control Channel Resource Allocation for Collision Reduction
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Solution Overview
Problem
In LTE systems, the high aggregation degree of control channel resource elements leads to increased channel estimation time and collision probability between candidate control channels, reducing control channel capacity.
Innovation Solution
The method involves determining specific aggregation levels and resource elements for candidate control channels, where the terminal identifies a first and second aggregation level, determining a target set based on a terminal identifier, and allocating control channel resource elements to reduce overlapping and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If candidate control channels at two aggregation levels share control channel resource elements, then channel estimation time is reduced, but control channel resource element aggregation degree becomes excessively high
Solution Approach 1:
The patent segments control channel resource elements into different groups based on aggregation levels. Specifically, it divides resource elements into first resource elements (for first aggregation level) and second resource elements (for second aggregation level), preventing excessive sharing and overlapping between different aggregation levels while still allowing controlled sharing within the same aggregation level.
Solution Approach 2:
The patent applies different resource element allocation strategies to different aggregation levels. First aggregation level channels use first resource elements with certain sharing rules, while second aggregation level channels use second resource elements with different sharing rules, optimizing performance for each aggregation level locally rather than applying a uniform approach.
2Quantity of substance
If search space with different aggregation levels shares a same control channel resource element, then resource utilization is improved, but overlapping probability of resource elements increases
Solution Approach 1:
The patent segments resource elements into distinct groups (first resource elements and second resource elements) associated with different aggregation levels. This segmentation reduces overlapping probability by ensuring that channels at different aggregation levels primarily use their designated resource element groups, while still maintaining good resource utilization through controlled sharing within groups.
3Quantity of substance
If control channel resource elements are highly aggregated, then resource efficiency is improved, but collision probability between different candidate control channels increases
Solution Approach 1:
The patent changes the aggregation parameter by introducing different aggregation levels (first aggregation level and second aggregation level) with different resource element sharing rules. This allows the system to adapt the aggregation degree based on the specific aggregation level, optimizing resource efficiency while controlling collision probability through parameter differentiation.
Data Source
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AI summary
A candidate control channel resource determining method and apparatus are provided. The method includes: determining, by a terminal, a first aggregation level and a second aggregation level, where the aggregation level is a quantity of control channel resource elements included in a candidate control channel, the first aggregation level is less than the second aggregation level, and control channel resource elements included in a candidate control channel set corresponding to the second aggregation level form a first quantity of candidate control channel sets corresponding to the first aggregation level; determining, by the terminal, one of the first quantity of candidate control channel sets corresponding to the first aggregation level as a target set based on a terminal identifier of the terminal, and determining a control channel resource element occupied by each candidate control channel in the target set; and detecting, by the terminal, a candidate control channel in the target set for a received signal.