Relay Control Channel Decoding via CSI-RS Resource Segmentation
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Solution Overview
Problem
In wireless communication systems, relay base stations face challenges in efficiently decoding relay control information due to the need to consider numerous decoding candidates for resource elements used by donor base stations for transmitting reference signals or muting, which complicates control channel detection and decoding.
Innovation Solution
The method involves determining and signaling the configuration of resource elements used by a donor base station for transmitting channel state information-reference signals (CSI-RS) or muting, allowing relay nodes to reduce decoding candidates by assuming these resources are not used for control channel information, thereby simplifying the decoding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay base stations consider all resource elements as potential decoding candidates for control information, then control channel detection reliability is improved, but decoding complexity and processing time increase significantly
Solution Approach 1:
The patent segments the resource elements into two distinct categories: those configured for CSI-RS transmission and those available for control information. By dividing the resource space and applying different decoding assumptions to each segment, the relay base station reduces the number of candidates that require exhaustive blind decoding, thus lowering complexity while maintaining reliable detection in the control information segments.
Solution Approach 2:
The patent applies preliminary action by having the donor base station pre-configure and signal the CSI-RS resource element pattern to the relay base station before control information transmission. This advance configuration allows the relay base station to pre-determine which resource elements are occupied and exclude them from control information decoding candidates, reducing processing complexity before the actual decoding process begins.
2Measurement precision
If relay base stations perform blind decoding on all possible resource element sets, then control information detection accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The patent extracts and removes the CSI-RS resource elements from the set of potential control information candidates. By taking out the occupied resource elements based on the configured pattern, the relay base station eliminates unnecessary blind decoding attempts on those resources, reducing processing time and computational load while maintaining detection accuracy on the remaining valid candidates.
3Productivity
If donor base station transmits control information on all resource elements, then resource utilization efficiency is improved, but interference with reference signal transmission increases
Solution Approach 1:
The patent applies local quality by assigning different functions to different resource elements based on the configured pattern. Resource elements designated for CSI-RS transmission maintain high quality for reference signal purposes, while other resource elements are available for control information. This spatial and functional differentiation eliminates interference between the two signal types while maintaining efficient overall resource utilization.
Data Source
AI summary
Aspects of the present disclosure relate to methods for allowing a relay base station to more efficiently decode relay control information transmitted from a donor base station. A relay base station may determine a configuration of resource elements used for transmission of reference signals and decode sets of resource elements based on the configuration of reference signals. According to aspects, a donor base station may transmit relay control information in a data portion of a subframe based on the configuration of reference signals transmitted by the donor base station.