UE CSI-RS Timing Synchronization Without Target Cell SSB Info
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Solution Overview
Problem
User Equipment (UE) in 5G networks face challenges in performing CSI-RS measurements on target cells when the associated Synchronization Signal Block (SSB) information is absent from the measurement configuration, leading to potential timing misalignments and measurement inaccuracies.
Innovation Solution
The UE receives a measurement configuration message indicating CSI-RS measurements on target cells without SSB information, using additional synchronization methods such as determining the time and frequency resources based on indications of SSB transmission status, performing SFTD measurements, or adjusting search windows to accurately measure CSI-RS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the measurement configuration message does not include SSB information for the target cell, then the device complexity is reduced and the measurement process is simplified, but timing misalignment occurs leading to measurement inaccuracies
Solution Approach 1:
The patent applies preliminary action by performing SFTD measurements and determining timing offsets before conducting CSI-RS measurements. The UE calculates the timing difference between serving cell and target cell SSBs in advance, then uses this pre-determined offset to accurately locate CSI-RS resources without requiring SSB information in the measurement configuration message.
2Measurement precision
If the UE performs additional synchronization methods such as SFTD measurements, then timing and frequency alignment is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent applies partial action by performing only the necessary SFTD measurements specifically for timing offset calculation, rather than complete synchronization procedures. The UE selectively executes partial synchronization tasks (timing offset estimation, frequency offset compensation) only when SSB information is absent, reducing overall processing time while maintaining measurement precision.
Data Source
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AI summary
A user equipment (UE) is served by a serving cell of a network and is configured to measure channel state information reference signals (CSI-RS) from a target cell. The UE receives, from the serving cell, a measurement configuration message indicating the UE is to measure CSI-RS from a target cell of the network, wherein the measurement configuration message does not include Synchronization Signal Block (SSB) information for the target cell but further comprises an indication of whether the target cell transmits SSBs. The UE determines, based on at least the measurement configuration message, a time and frequency resource on which the CSI-RS of the target cell are to be transmitted and measures the CSI-RS of the target cell.