Wireless Control Channel Search Space Merging for Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in channel formats and resource allocation, which hinders effective communication in carrier aggregation scenarios.
Innovation Solution
The method involves receiving a downlink control channel in a wireless communication system with multiple cells, where specific cells with restricted downlink transmission use shared search space resources to transmit control channel candidates, allowing for non-contiguous configuration and merging of search spaces, and utilizing carrier indicator fields to distinguish information sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If search space resources are allocated separately for each cell in carrier aggregation, then control information can be transmitted for multiple cells, but resource utilization efficiency deteriorates when downlink transmission is restricted in specific cells
Solution Approach 1:
The patent merges search space resources from multiple cells into a shared search space resource pool. When downlink transmission is restricted in specific cells, those cells' search space resources are merged with other cells' search space resources, allowing flexible reuse of resources across cells and improving overall resource utilization efficiency.
Solution Approach 2:
The patent implements dynamic search space resource allocation where search space resources can be dynamically reassigned based on transmission restrictions. The eNodeB can dynamically determine which cells have transmission restrictions and reallocate their search space resources to other cells, making the resource allocation adaptive to changing transmission conditions.
2Loss of energy
If search space resources are merged from multiple cells, then resource utilization efficiency improves, but the complexity of managing and distinguishing control channel candidates increases
Solution Approach 1:
The patent segments control channel candidates within the merged search space resource by associating each candidate with specific cell information. Even though resources are merged, the control channel candidates are logically segmented and distinguished through their association with original cells, allowing the UE to correctly identify and process candidates from different cells.
Solution Approach 2:
The patent uses cell identification information as an intermediary to distinguish control channel candidates within the merged search space. This intermediary mechanism allows the system to maintain clear identification and separation of control information from different cells while using shared physical resources, reducing management complexity.
3Adaptability or versatility
If control channel candidates from multiple cells are transmitted in shared search space resources, then resource allocation flexibility improves, but the difficulty of detecting and measuring control information increases
Solution Approach 1:
The patent applies local quality by associating control channel candidates with specific cell characteristics and identification information. Each control channel candidate in the shared search space is tagged with cell-specific information, allowing the UE to locally identify and process candidates based on their associated cell properties, making detection easier despite resource sharing.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device therefor, wherein a method for receiving a downlink control channel in a communication device having a plurality of cells in a wireless communication system comprises the steps of: receiving a subframe containing a plurality of search space resources which are preset to transmit a plurality of downlink control channel candidates, wherein each search space resource corresponds to each cell; and monitoring said plurality of the control channel candidates from at least a portion of said plurality of the search space resources, for said downlink control channel, wherein among said plurality of the cells, if there are one or more specific cells in which downlink transmission is limited at said subframe, search space resources corresponding to said one or more specific cells are used to transmit downlink control channel candidates or downlink shared channels of other cells.