Timing Advance Handover Using Preamble Feedback Association
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Solution Overview
Problem
Inaccurate timing advance acquisition during L1 and/or L2 triggered mobility switch leads to unsuccessful cell switching due to ambiguous association of terminal devices with obtained timing advances, causing synchronization issues.
Innovation Solution
A method where network devices exchange identification and time-frequency position information of random access preambles to accurately associate terminal devices with their corresponding timing advances, ensuring precise synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple terminal devices send random access preambles to the target DU, then the target DU can obtain multiple different TAs through calculation, but the source DU cannot determine which terminal device corresponds to which TA, resulting in inaccurate TA assignment
Solution Approach 1:
The target DU feeds back identification information of the random access preamble and time-frequency position information to the source DU. This feedback mechanism enables the source DU to determine which terminal device corresponds to which TA, resolving the information loss problem while maintaining TA acquisition accuracy
Solution Approach 2:
The target DU acts as an intermediary that receives random access preambles from multiple terminal devices, calculates multiple TAs, and then forwards both the TAs and their associated identification information to the source DU. This intermediary function preserves the association information that would otherwise be lost
2Measurement precision
If the target DU sends TAs to the source DU through the CU, then multiple TAs can be transmitted, but the CU cannot determine which source DU corresponds to which TA, causing inaccurate TA delivery
Solution Approach 1:
The target DU includes identification information of the random access preamble and time-frequency position information in the message sent to the source DU. This feedback provides the necessary association information to correctly match TAs with their corresponding source DUs and terminal devices
Solution Approach 2:
The target DU prepares and includes identification information along with the TA before sending it to the source DU. This preliminary inclusion of association information ensures that the source DU can correctly identify which terminal device should receive which TA, preventing information loss during transmission through the CU
Data Source
AI summary
In an example communication method, a first network device receives a first message from a second network device, where the first message indicates a first timing advance (TA) and includes first information. The first information includes one or more of the following: identification information of a first random access preamble and information about a first time-frequency position; identification information of a first terminal device; or the identification information of the first random access preamble, the information about the first time-frequency position, and the identification information of the first terminal device. The first network device sends the first TA to the first terminal device based on the first information.