5G NR Cell Search Using SSB Frequency Indication
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Solution Overview
Problem
The duration of the cell search procedure in 5G NR networks is prolonged due to wider frequency bands and multiple subcarrier spacing configurations, leading to increased latency and a negative impact on user experience.
Innovation Solution
The user equipment (UE) employs a targeted scanning approach by selecting frequency bands based on locally stored indications of synchronization signal block (SSB) locations, reducing the number of operations and power consumption during the cell search process, and utilizing an acquisition database to focus scans on likely SSB positions within the frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE scans all frequency bands to ensure comprehensive cell detection, then the reliability of cell search is improved, but the time required for cell search increases
Solution Approach 1:
The network provides SSB frequency indication information to the UE in advance through system information or other signaling. This preliminary information allows the UE to skip exhaustive frequency band scanning and directly search at the indicated frequencies, significantly reducing cell search time while maintaining reliable cell detection
Solution Approach 2:
The SSB frequency indication information acts as an intermediary that bridges the network and UE, guiding the UE to the correct frequency without requiring it to scan all possible bands. This intermediary information enables efficient and reliable cell search by directing resources to the most relevant frequencies
2Reliability
If the UE performs comprehensive frequency band scanning, then the coverage of cell detection is improved, but the power consumption increases
Solution Approach 1:
By receiving SSB frequency indication information in advance, the UE can perform targeted scanning only at indicated frequencies rather than scanning all frequency bands. This preliminary guidance dramatically reduces power consumption while maintaining comprehensive detection coverage for cells that use the indicated frequencies
Solution Approach 2:
The UE performs partial scanning by focusing only on the subset of frequencies indicated by the network rather than scanning all possible frequencies. This partial action is sufficient for detecting available cells while avoiding the excessive power consumption of exhaustive scanning
3Adaptability or versatility
If the UE scans multiple frequency bands with multiple subcarrier spacing configurations, then the adaptability to different network configurations is improved, but the complexity of the cell search procedure increases
Solution Approach 1:
The network provides not only frequency indications but also subcarrier spacing configuration information in advance. This preliminary information allows the UE to adapt to different network configurations without having to implement complex trial-and-error procedures for each configuration, reducing the overall complexity of the cell search procedure
Data Source
AI summary
The exemplary embodiments describe devices, systems and methods for implementing various exemplary techniques related to fifth generation (5G) new radio (NR) cell search. A user equipment (UE) selects a frequency band to scan during a cell search procedure and identifies a frequency within the frequency band that is associated with a synchronization signal block (SSB) based on an indication of the frequency stored locally at the UE prior to the cell search procedure. The UE then scans the frequency for the SSB and determines that the SSB has been broadcast by a cell over the frequency.