PL-RS Measurement During SCell Synchronization to Reduce Delay
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Solution Overview
Problem
Existing communication technologies face challenges in reducing the SCell activation delay due to the need for PL-RS measurement after receiving the TCI activation command, which adds additional delay to the process.
Innovation Solution
Perform PL-RS measurement in parallel with time and frequency synchronization by using synchronized signal blocks (SSBs) to determine a first PL-RS before receiving the TCI activation command, allowing for reduced SCell activation delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PL-RS measurement is performed after receiving TCI activation command, then measurement accuracy is ensured, but SCell activation delay increases
Solution Approach 1:
The terminal performs PL-RS measurement on SSB before receiving the TCI activation command, during the time and frequency synchronization process. This preliminary measurement allows the terminal to have PL-RS measurement results ready when the activation command is received, thereby reducing SCell activation delay while ensuring measurement reliability through the use of SSB as a reliable reference signal
Solution Approach 2:
The patent uses Synchronized Signal Block (SSB) as an intermediary reference signal to enable PL-RS measurement before TCI activation. The SSB serves as a mediator that allows the terminal to perform measurements during synchronization without requiring the TCI command to be received first, thus resolving the timing conflict between measurement accuracy and activation speed
2Productivity
If PL-RS measurement is performed in parallel with time and frequency synchronization, then SCell activation delay is reduced, but measurement complexity increases
Solution Approach 1:
The patent merges the PL-RS measurement process with the time and frequency synchronization process. Instead of performing these as separate sequential operations, the terminal combines them into a single integrated process where both synchronization and PL-RS measurement on SSB occur simultaneously, thereby improving activation speed without significantly increasing overall system complexity
Solution Approach 2:
The Synchronized Signal Block (SSB) serves multiple functions simultaneously: it provides time synchronization, frequency synchronization, and serves as the reference signal for PL-RS measurement. This multi-functionality allows the terminal to achieve multiple objectives through a single signal processing operation, reducing the need for additional separate measurement procedures
Data Source
AI summary
Embodiments of the present disclosure relate to enhanced pathloss reference signal (PL-RS) measurement. In an aspect, a terminal device receives, from a network device via a first cell, an activation command for activating at least one second cell. The terminal device receives, from the network device via the at least one second cell, at least one synchronized signal block (SSB) associated with the activation of the at least one second cell. The terminal device performs time and frequency synchronization based on the at least one SSB, and determines a first PL-RS based on the at least one SSB during the time and frequency synchronization. By implementing the embodiments of the present disclosure, the first PL-RS could be determined in parallel with/during the time and frequency synchronization process and the terminal device is able to perform the PL-RS measurement before receiving the TCI activation command, thereby reducing SCell activation delay.