Neighbor Cell Detection via Subband-Time Segmentation
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Solution Overview
Problem
The increased complexity and cost of communication devices in detecting intra-frequency neighbor cells in 5G wireless communication systems due to the flexible subband configuration and longer synchronization signal repetition period, which challenges the efficient detection without a dramatic increase in memory requirements or processing capabilities.
Innovation Solution
A method for neighbor cell detection that involves selecting and processing subband-time interval resources within the system frequency bandwidth, recording radio samples, and executing synchronization signal detection, repeating the process until a stop criterion is met, thereby reducing memory requirements and optimizing hardware utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE searches for synchronization signals across the entire system bandwidth with flexible subband configuration and longer repetition period, then neighbor cell detection capability is improved, but device complexity and memory requirements increase dramatically
Solution Approach 1:
The patent divides the system bandwidth into multiple subbands and the synchronization signal repetition period into multiple time intervals. The UE selectively processes only specific subband-time interval resources where synchronization signals are likely to be found, rather than searching the entire bandwidth continuously. This segmentation reduces the processing burden and memory requirements while maintaining detection capability.
Solution Approach 2:
The UE performs partial processing by selecting and processing only certain subband-time interval resources instead of the entire system bandwidth. The selection is based on likelihood of finding synchronization signals, performing sufficient action to detect neighbor cells while avoiding excessive processing of all possible resources.
2Measurement precision
If the UE processes the entire system bandwidth for synchronization signal detection, then detection accuracy is improved, but memory requirements and processing capabilities must increase dramatically
Solution Approach 1:
The patent segments the system bandwidth into multiple subbands and divides the synchronization signal repetition period into multiple time intervals. The UE selectively records and processes radio samples only from specific subband-time interval resources, significantly reducing the quantity of data that must be stored in memory while maintaining detection accuracy through targeted processing.
Solution Approach 2:
The patent extracts only the necessary subband-time interval resources for synchronization signal detection from the entire system bandwidth. By identifying and processing only the relevant portions where synchronization signals are likely to be present, the UE reduces memory requirements and processing load while maintaining detection accuracy.
3Adaptability or versatility
If the synchronization signal repetition period is increased, then network flexibility is improved, but the time required for neighbor cell detection increases
Solution Approach 1:
The patent divides the longer synchronization signal repetition period into multiple time intervals and further segments the bandwidth into subbands. The UE selectively processes specific subband-time interval resources, which allows it to find synchronization signals more quickly within the extended period, thereby reducing the effective detection time despite the longer overall repetition period.
Solution Approach 2:
The UE performs preliminary selection of subband-time interval resources based on expected synchronization signal locations before conducting full detection. This preliminary action allows the UE to focus processing on the most likely candidates, reducing the time required to detect neighbor cells even when the synchronization signal repetition period is extended for network flexibility.
Data Source
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AI summary
A method (20) of neighbor cell detection performed in a communication device (35) is disclosed. The method (20) comprises selecting (21) at least one subband-time interval resource for processing, wherein each subband is part of a system frequency bandwidth and each time interval is a part of a synchronization signal repetition time period, recording (22) one or more radio samples associated with the at least one subband-time interval resource, executing (23) cell detection on the recorded radio samples, and repeating (24) the selecting (21), recording (22) and executing (23) until a stop criterion is fulfilled. A corresponding communication device (35) computer program (32) and computer program product (31) are also provided.