Cell Search Mode Detection Across Licensed and Shared RF Bands
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Solution Overview
Problem
Devices face challenges in determining whether a carrier frequency is associated with a licensed or shared radio frequency spectrum band, which can adversely impact cell search processes.
Innovation Solution
A user equipment (UE) performs a cell search procedure by initially assuming a shared RF spectrum band and receives system information messages to determine the operating mode, switching to licensed mode parameters if necessary, enabling efficient connection establishment with a network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses a first set of parameters for initial access in a first RF spectrum band, then the cell search process can be optimized for that band, but the device is unable to determine whether a carrier frequency is associated with the first RF spectrum band or the second RF spectrum band, which adversely impacts cell search processes
Solution Approach 1:
The patent applies preliminary action by having the network entity pre-configure the UE with a first set of parameters for initial access in a first RF spectrum band. This allows the UE to have parameters ready in advance, reducing the complexity of real-time parameter determination during cell search while maintaining reliability through pre-planned parameter sets.
Solution Approach 2:
The patent introduces an intermediary mechanism through system information messages that carry indicators specifying which parameter set should be used. This intermediary information resolves the ambiguity of whether a carrier frequency belongs to the first or second RF spectrum band, allowing the UE to correctly select parameters without complex determination logic.
2Measurement precision
If the UE assumes a shared RF spectrum band and receives system information messages, then the operating mode can be accurately determined, but this requires additional message reception and processing time
Solution Approach 1:
The network entity transmits system information messages containing operating mode indicators before the UE needs to make parameter selection decisions. This preliminary provision of information allows the UE to accurately determine the operating mode without requiring complex real-time analysis, reducing the time loss while maintaining precision.
Solution Approach 2:
The patent extracts the essential operating mode information from the system information messages, placing it in a readily accessible format within the MIB or SIB1. This extraction of critical information allows the UE to quickly obtain the necessary data without processing entire message structures, reducing latency while maintaining accurate operating mode determination.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may perform a cell search procedure to attach to a cell of a network entity. In some examples, if the UE is unable to determine an operating mode of the cell, the UE may receive one or more system information messages via the cell using a first operating mode associated with a shared radio frequency (RF) spectrum band. The one or more system information messages may indicate that the operating mode of the cell is either the first operating mode associated with the shared RF spectrum band or a second operating mode associated with a licensed RF spectrum band. Accordingly, the UE may establish a connection with the network entity via the cell using the operating mode indicated by the one or more system information messages.