Downlink Control Channel Resource Allocation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently allocating resources for downlink control channels, particularly in managing resource elements and reference signals across different subframes and resource blocks, which affects channel quality and data transmission efficiency.
Innovation Solution
A method for allocating resources for a downlink control channel by performing mapping and indexing of resource elements and resource element groups within resource blocks, adjusting according to the aggregation level and subframe type, and incorporating specific indexing rules and puncturing techniques to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource elements are mapped to resource blocks for downlink control channel allocation, then resource utilization is improved, but inconsistency in the number of available resource elements across different subframes and resource blocks deteriorates channel quality
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the resource element group indexing based on the subframe type and the number of resource blocks. Specifically, when the number of resource blocks is greater than 1, a different indexing rule is applied compared to when it is 1 or less. This ensures that the number of resource elements in each resource element group remains consistent across different subframes and resource blocks, thereby maintaining channel quality while improving resource utilization.
2Adaptability or versatility
If resource element groups are configured with varying numbers of resource elements across different subframes, then adaptability to different subframe types is improved, but inconsistency in control channel element resources deteriorates data transmission efficiency
Solution Approach 1:
The patent applies local quality by configuring resource element groups with specific local indexing rules tailored to different subframe types and resource block configurations. Instead of using a uniform indexing approach, the patent implements location-specific indexing that adapts to local conditions (subframe type and resource block count) while ensuring that the overall number of resource elements per group remains consistent. This maintains data transmission efficiency while providing adaptability to different subframe types.
3Adaptability or versatility
If aggregation level is adjusted for downlink control channel, then control channel flexibility is improved, but resource allocation complexity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the downlink control channel into control channel elements, which are further segmented into resource element groups. Each resource element group is indexed using specific rules that simplify the aggregation process. By segmenting the resource allocation into manageable units with consistent sizing, the patent enables flexible aggregation level adjustment while reducing the overall complexity of resource allocation through standardized indexing procedures.
Data Source
AI summary
A method for allocating resources for a downlink control channel by a base station in a wireless communication system is disclosed. Specifically, the method comprises the steps of: mapping resource elements to resource element groups for each of resource blocks; forming control channel elements by using a predetermined number of resource element groups from among the resource element groups; and allocating control channel elements of a number corresponding to an aggregation level of the downlink control channel as resources for the downlink control channel, wherein the number of available resource elements included in each of the resource element groups or the number of available resource elements included in each of the control channel elements of a number corresponding to the aggregation level is uniform.