UE-Specific Reference Signal for Secondary Cell Activation
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Solution Overview
Problem
The existing methods for secondary cell activation in wireless communication networks are inefficient due to the reliance on cell-specific reference signals (RS) for timing synchronization, which prolongs the activation time and delays carrier aggregation processes.
Innovation Solution
Implementing a UE-specific reference signal (RS) with shorter or aperiodic periodicity for fine time tracking, allowing the user equipment (UE) to perform synchronization and automatic gain control before receiving the next signal block from the secondary cell, thereby expediting the secondary cell activation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cell-specific reference signals are used for timing synchronization during secondary cell activation, then the activation process can be initiated, but the activation time is prolonged and carrier aggregation is delayed
Solution Approach 1:
The patent changes the reference signal periodicity parameter from the standard value to a shorter or aperiodic value for UE-specific reference signals. This parameter change enables faster fine time tracking and automatic gain control, directly reducing the secondary cell activation delay and improving carrier aggregation efficiency
Solution Approach 2:
The patent performs fine time tracking and automatic gain control as preliminary actions before the UE receives the next signal block from the secondary cell. By completing these synchronization tasks in advance using UE-specific reference signals, the activation process is expedited without compromising communication quality
Data Source
AI summary
Techniques discussed herein may better ensure efficient fine time tracking during a second cell (SCell) activation procedure by using a tracking reference signal (TRS) that is User Equipment (UE) specific. A primary cell (PCell) may provide a UE with a TRS configuration that includes a UE-specific reference signal (RS) with aperiodicity. In response to receiving a SCell activation command from the PCell, the UE may perform cell activation in accordance with the UE-specific RS. As the delay time for the UE-specific RS may be less than the delay time for a system synchronization block (SSB) from the SCell, use of the UE-specific RS may expedite the cell activation procedure.