UE-Specific Random Access Preamble Error Indication for Synchronization
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Solution Overview
Problem
Existing wireless communication systems, particularly in non-terrestrial networks, face challenges with synchronization errors due to inaccurate GNSS information, leading to unsuccessful random access procedures and potential interference with other devices, as current mechanisms do not adequately correct time and frequency synchronization offsets beyond the capabilities of timing advance commands.
Innovation Solution
A method where a user device transmits a first random access preamble and receives a message with a reception error indication, allowing it to perform adjustments based on assistance information to improve time and frequency synchronization, including additional corrections and re-attempts using different RACH procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing advance commands are used to correct synchronization offsets, then random access procedures can be performed, but significant synchronization errors beyond timing advance capabilities cannot be corrected
Solution Approach 1:
The network node acts as an intermediary by providing assistance information that mediates between the UE's insufficient synchronization and the network's requirement for accurate synchronization. This assistance information enables the UE to correct large synchronization offsets that timing advance commands alone cannot handle.
Solution Approach 2:
The network node performs preliminary action by providing assistance information before the random access procedure. This pre-provided information enables the UE to pre-correct its synchronization offsets, ensuring that when the random access preamble is transmitted, the synchronization is already within acceptable ranges.
2Ease of operation
If random access preambles are transmitted with synchronization errors, then the procedure can be initiated, but interference with other devices occurs and success rate decreases
Solution Approach 1:
The system applies preliminary anti-action by providing assistance information that prevents synchronization errors before they cause interference. The UE uses this information to pre-correct its transmission timing and frequency, thereby avoiding the harmful interference that would otherwise occur during random access preamble transmission.
3Device complexity
If synchronization corrections are performed without assistance information, then the system remains simple, but time and frequency synchronization cannot be significantly improved
Solution Approach 1:
The invention changes the parameter of synchronization accuracy by introducing assistance information that provides additional correction capabilities. This information enables the UE to adjust its time and frequency parameters beyond what standard timing advance commands can achieve, significantly improving synchronization precision without requiring fundamental system redesign.
Data Source
AI summary
According to example embodiments, a method may include transmitting, by a user device to a network node, a first random access preamble; receiving, by the user device from the network node, a random access procedure message that includes a random access preamble reception error indication; and performing, by the user device based on the received random access procedure message, at least one of a time adjustment or a frequency adjustment to improve time and/or frequency synchronization between the user device and the network node for transmission of a second random access preamble.