Cell Reselection Deprioritization Without SSBs
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in cell reselection procedures due to the absence of cell-defining synchronization signal blocks (SSBs), leading to resource wastage and increased latency as user equipment (UE) attempts to reselect cells without necessary system information, causing ping pong reselection and confusion in frequency prioritization.
Innovation Solution
The method involves receiving a master information block (MIB) indicating the absence of cell-defining SSBs and deprioritizing the reselection procedure for cells on such frequencies, thereby conserving resources and reducing latency by only attempting reselection after higher priority cells with SSBs have been considered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs cell reselection procedure on frequencies without cell-defining SSBs, then the UE may find additional cells for reselection, but the UE wastes resources and increases latency by attempting reselection without necessary system information
Solution Approach 1:
The UE performs preliminary checking of the MIB to determine the presence of cell-defining SSBs before initiating the cell reselection procedure. This preliminary action prevents wasting resources on frequencies that cannot support proper cell reselection, as the MIB indication is checked in advance to filter out unsuitable frequencies from the reselection candidate list.
Solution Approach 2:
The UE performs cell reselection measurements and evaluations only on frequencies that have cell-defining SSBs, rather than exhaustively searching all frequencies. This partial action approach focuses resources on viable candidates only, avoiding the excessive action of attempting reselection on frequencies without necessary system information.
2Adaptability or versatility
If the UE performs cell reselection procedure on frequencies without cell-defining SSBs, then the UE may find additional cells for reselection, but the reselection latency increases due to unsuccessful attempts
Solution Approach 1:
The UE performs preliminary verification of MIB information to identify frequencies with cell-defining SSBs before starting the reselection procedure. This preliminary action ensures that the UE only spends time evaluating and attempting reselection on frequencies that can actually support cell reselection, thereby minimizing reselection latency.
Solution Approach 2:
The UE skips frequencies that are indicated by the MIB as not having cell-defining SSBs, rapidly filtering them out from the reselection candidate list. This skipping mechanism allows the UE to rush through the frequency evaluation process by focusing only on viable candidates, significantly reducing the time spent on unsuccessful reselection attempts.
3Adaptability or versatility
If the UE performs cell reselection on frequencies without cell-defining SSBs, then more cells are available for reselection, but ping pong reselection occurs due to lack of system information
Solution Approach 1:
The UE performs preliminary checking of the MIB to determine whether frequencies have cell-defining SSBs before adding them to the reselection candidate list. This preliminary verification ensures that only frequencies with complete system information are considered, preventing the reliability issues and ping pong reselection that would occur on frequencies without proper system information.
4Speed
If the UE prioritizes reselection on frequencies without cell-defining SSBs, then reselection speed may increase, but frequency priority confusion occurs
Solution Approach 1:
The UE performs preliminary evaluation of frequency priorities based on MIB information, identifying which frequencies have cell-defining SSBs before executing the reselection procedure. This preliminary prioritization prevents confusion by ensuring that higher priority is always given to frequencies with proper system information, maintaining clear and unambiguous frequency priority management.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a master information block (MIB) that includes an indication that there is no cell-defining synchronization signal block (SSB) on a frequency on which the UE is camped; and deprioritize a reselection procedure for one or more cells on the frequency based at least in part on the indication that there is no cell-defining SSB on the frequency. Numerous other aspects are provided.