Terminal Random Access Low-Power State Synchronization
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Solution Overview
Problem
In communication systems, terminals face challenges in maintaining uplink synchronization when entering a low-power receiver state during the random access procedure, as they struggle to manage timing advance values and prevent loss of synchronization.
Innovation Solution
The method involves determining, based on received information, whether to terminate or continue the random access procedure and entering a low-power receiver state, including stopping the time alignment timer and potentially triggering another random access procedure upon exiting the low-power state to maintain uplink synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal enters the low-power receiver state during the random access procedure, then energy consumption is reduced, but uplink synchronization is lost
Solution Approach 1:
The terminal device stores the timing advance value before entering the low-power receiver state, so that when exiting the low-power state, it can quickly restore uplink synchronization using the pre-stored timing advance value without needing to perform a complete random access procedure
Solution Approach 2:
The terminal device monitors the time alignment timer status and determines whether to store timing advance values based on whether the timer is running. This feedback mechanism ensures that timing advance values are stored only when necessary to maintain synchronization, optimizing both energy consumption and synchronization reliability
2Reliability
If the terminal continues the random access procedure after receiving low-power indication, then uplink synchronization is maintained, but energy saving opportunity is lost
Solution Approach 1:
The terminal device dynamically determines whether to continue or terminate the random access procedure based on the status of the time alignment timer. If the timer is running, the procedure is terminated to save energy; if not running, it continues to maintain synchronization. This dynamic decision-making optimizes the trade-off between energy consumption and synchronization maintenance
3Loss of time
If the terminal stores timing advance value before entering low-power state, then synchronization is quickly restored after exiting, but additional memory and processing are required
Solution Approach 1:
The terminal device changes the state parameter of the time alignment timer to determine whether timing advance value storage is necessary. By monitoring whether the timer is running or expired, the system intelligently decides to store or not store the timing advance value, reducing unnecessary memory usage and processing while ensuring synchronization can be restored when needed
Data Source
AI summary
A method for processing a random access procedure, a terminal device, and a network device are provided. The method includes the following. A terminal device receives, in the random access procedure, an indication of entering a low-power receiver state sent by a network device. The terminal device determines, according to first information, to terminate the random access procedure and enter the low-power receiver state, or to continue the random access procedure.