Resource Allocation Search Space Determination in Carrier Aggregation
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Solution Overview
Problem
Current methods for transmitting resource allocation information in carrier aggregation systems for mobile communication systems lack efficiency, particularly in terms of blind decoding complexity and Hybrid Automatic Repeat Request (HARQ) retransmission, especially when dealing with multiple Component Carriers (CCs).
Innovation Solution
The proposed solution involves determining a search space for resource allocation information in a second frequency band using data from a first frequency band, allowing for detection and re-detection of resource allocation information with reduced blind decoding complexity, and enabling HARQ retransmission solely on non-anchor CCs by restricting the search range and time intervals, thereby optimizing resource allocation and transmission processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource allocation information is detected in both first frequency band and second frequency band, then reliability of data reception is improved, but blind decoding complexity increases
Solution Approach 1:
The patent segments the frequency bands into first frequency band (anchor CC) and second frequency band (non-anchor CC), applying different detection strategies to each segment. The UE detects resource allocation information in the first frequency band using conventional methods, while in the second frequency band, it uses a simplified method based on search space determination from the first band, thereby reducing overall blind decoding complexity while maintaining reliability
Solution Approach 2:
The patent introduces search space information from the first frequency band as an intermediary to guide resource allocation information detection in the second frequency band. By using the search space determined from the anchor CC as a mediator, the UE can efficiently locate and decode resource allocation information in non-anchor CCs without performing exhaustive blind decoding across all frequency bands
2Reliability
If HARQ retransmission is enabled on non-anchor CCs, then data transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies different resource allocation and detection characteristics to different frequency bands. The first frequency band (anchor CC) uses conventional resource allocation methods, while the second frequency band (non-anchor CC) uses a specialized method where search space is determined from the anchor CC and resource allocation is restricted to specific search spaces, enabling HARQ retransmission with reduced complexity
Solution Approach 2:
The patent performs preliminary determination of search space in the first frequency band before detecting resource allocation information in the second frequency band. By pre-determining the search space based on anchor CC information, the system prepares the necessary detection parameters in advance, simplifying subsequent resource allocation and HARQ retransmission operations on non-anchor CCs
3Productivity
If search space is restricted to reduce blind decoding complexity, then detection efficiency is improved, but flexibility in resource allocation decreases
Solution Approach 1:
The patent implements dynamic search space determination where the search space for resource allocation information in the second frequency band is adaptively determined based on information from the first frequency band. This dynamic approach allows the system to adjust the search space according to actual transmission conditions while maintaining a restricted detection range, balancing detection efficiency with resource allocation flexibility
Data Source
AI summary
An apparatus and method for resource allocation information transmission is provided. The method includes determining a search space for use in a second frequency band using resource allocation information of a first process detected in a first frequency band, detecting resource allocation information using the search space in the second frequency band, and when failing to decode received data according to the resource allocation information detected in the second frequency band, re-detecting resource allocation information of the first process in the second frequency band in a first time interval using the search space without detecting the resource allocation information of the first process in the first frequency band.