Cell Synchronization Signal Search Space Segmentation
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Solution Overview
Problem
Current LTE cell synchronization methods are inefficient due to the need for lengthy detection times, especially in low signal quality conditions, as they require decoding multiple synchronization signals, leading to increased detection time and latency.
Innovation Solution
Grouping physical cell identity (PCI) values into subsets based on location, allowing for reduced search spaces during subsequent cell detection attempts, and optimizing cell planning for improved correlation properties between signals, thereby minimizing decoding effort and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell synchronization methods are used to ensure reliable cell detection, then detection reliability is maintained, but detection time and latency increase significantly
Solution Approach 1:
The patent segments the cell search space by dividing cells into groups based on geographic location. Each UE is configured with a specific cell group, allowing the UE to limit its synchronization signal detection to only cells within its configured group. This segmentation reduces the number of synchronization signals that need to be decoded while maintaining reliable detection within the relevant cell group.
2Productivity
If the search space for synchronization signals is reduced to decrease detection time, then detection speed improves, but the ability to detect cells in diverse locations may be compromised
Solution Approach 1:
The patent implements dynamic cell group configuration where UEs can be assigned to different cell groups based on their location, mobility state, and service requirements. The network can update the cell group configuration of a UE as it moves, allowing the UE to dynamically adapt its search space to maintain detection capability for relevant cells while keeping the search space size manageable for fast detection.
Data Source
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AI summary
The present disclosure relates to methods and devices for improved cell detection. In particular the disclosure relates to cell detection within a group of cells with high requirements of low latency. The disclosure also relates to corresponding computer program. The disclosure proposes a method, performed in a wireless device, for cell detection within a group of cells. The method comprises detecting S1 a first synchronization signal of a first cell in the group, wherein the detecting comprises searching for any of a set of predefined synchronization signals. The method further comprises obtaining S2, based on the detected first synchronization signal, information defining a subset of the predefined synchronization signals, wherein the subset defines synchronization signals that are possible within the group of cells. The method also comprises decoding S3 one or more further synchronization signals of cells in the group of cells using the obtained information. The disclosure also relates to a corresponding method in a network node and to corresponding devices and computer programs.