Neighbor Cell Synchronization Signaling for Faster 5G NR Access
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Solution Overview
Problem
In cellular communication networks, particularly in 5G NR systems, user equipment (UE) faces challenges in determining the synchronization status of neighboring cells during initial access procedures, as traditional methods do not provide clear information on the synchronization status or timing references of these cells, leading to inefficient and complex synchronization processes.
Innovation Solution
A network node device determines enhanced synchronization information, including physical cell identification, frame synchronization status, and time/frequency offsets for neighboring cells, and transmits this information via downlink signaling to client devices, allowing them to perform an accelerated and efficient synchronization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs traditional initial access procedures by detecting and decoding PSS/SSS pairs for each neighboring cell, then the UE can obtain synchronization information, but the search time and computational complexity increase significantly
Solution Approach 1:
The network node performs preliminary actions by determining enhanced synchronization information about neighboring cells (including frame synchronization status, time offsets, and frequency offsets) and transmitting this information to the UE via downlink signaling before the UE needs to perform cell access. This allows the UE to skip extensive detection and decoding procedures, significantly reducing initial access time while maintaining synchronization accuracy.
2Adaptability or versatility
If the UE attempts to detect and decode multiple PSS/SSS pairs for neighboring cells, then the UE can identify available cells, but the computational complexity and processing load increase
Solution Approach 1:
The network node acts as an intermediary by providing enhanced synchronization information that mediates between the UE and neighboring cells. This information includes physical cell identities, frame synchronization statuses, and timing/frequency offsets, which guide the UE's cell selection process without requiring the UE to perform complex detection and decoding of multiple PSS/SSS pairs, thus reducing computational complexity while maintaining adaptability.
3Use of energy by moving object
If the UE relies on previously obtained SSB decoding information from failed access attempts, then the UE retains some synchronization data, but the UE cannot determine whether this information is still valid for accessing other cells
Solution Approach 1:
The network node provides feedback by transmitting enhanced synchronization information that includes validity indicators and synchronization status for neighboring cells. This feedback mechanism allows the UE to determine whether previously obtained synchronization information from failed access attempts is still valid, enabling energy-efficient cell reselection without losing critical synchronization status information.
Data Source
AI summary
Devices, methods and computer programs for synchronization information determination with respect to neighboring cells in wireless communications are disclosed. A network node device determines enhanced synchronization information related to neighboring cell(s) of a current cell served by the network node device. The network node device transmits the determined enhanced synchronization information via downlink signaling to at least one client device located in the current cell. A client device receives the enhanced synchronization information via the downlink signaling. The client device determines synchronization status data of the neighboring cell(s) with respect to the current cell based on the received enhanced synchronization information. The client device may perform an accelerated search for at least one of the neighboring cell(s) based on the determined synchronization status data.