Random Access Configuration for Timing Advance in NTN Uplinks
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Solution Overview
Problem
In non-terrestrial networks, the large communication delays caused by satellite movement result in timing advance issues, leading to reduced random access capacity and increased scheduling delays due to the inability of base stations to distinguish between autonomous and non-autonomous timing advance determinations by terminals.
Innovation Solution
The base station provides different random access configuration information for terminals based on autonomous and non-autonomous timing advance determinations, allowing terminals to initiate random access using appropriate configuration information to compensate for delays, thereby increasing capacity and reducing scheduling delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single random access configuration is used for all terminals, then the system is simple to operate, but random access capacity is reduced and scheduling delays increase when terminals have different timing advance determination methods
Solution Approach 1:
The patent segments the random access configuration into two distinct sets: first random access configuration information for terminals that autonomously determine timing advance, and second random access configuration information for terminals that do not autonomously determine timing advance. This segmentation allows each configuration to be optimized for its specific terminal type, thereby increasing random access capacity while maintaining clear management boundaries through the indication information mechanism.
2Loss of time
If timing advance is set according to large delay in satellite communication, then communication delay is compensated, but timing advance value becomes large causing scheduling conflicts and reduced access capacity
Solution Approach 1:
The patent applies local quality by providing different random access configurations tailored to specific terminal characteristics. Terminals that autonomously determine timing advance receive first configuration information with parameters suited for accurate self-determined values, while terminals without autonomous determination capability receive second configuration information with parameters suited for network-assigned values. This localized optimization ensures each terminal type operates at peak efficiency, maximizing overall random access capacity while compensating for satellite communication delays.
3Ease of operation
If base station cannot distinguish between autonomous and non-autonomous timing advance determination, then the base station operation is simple, but scheduling delays increase due to inappropriate random access configuration
Solution Approach 1:
The patent implements preliminary action by having the base station send indication information to terminals before the random access procedure begins. This indication information pre-informs terminals of their timing advance determination method (autonomous or non-autonomous), allowing them to select the appropriate random access configuration in advance. This preliminary classification eliminates the need for the base station to distinguish between terminal types during operation, maintaining operational simplicity while preventing scheduling delays through proper configuration selection.
Data Source
AI summary
The present disclosure relates to a random access method, a configuration indication method and an electronic device. The random access method includes: initiating random access based on first random access configuration information in response to autonomous determination of timing advance by the terminal, initiating random access based on second random access configuration information in response to non-autonomous determination of timing advance by the terminal; the first random access configuration information is different from the second random access configuration information.