Radio Unit Delay Compensation for Synchronized Message Reception
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Solution Overview
Problem
The existing FHM systems in O-RAN architecture face increased cost due to the need for additional buffers to handle varying path lengths between the FHM and multiple RUs, causing asynchronous message reception.
Innovation Solution
A delay compensation method and device that determines compensation time lengths based on path delays of each RU, synchronizing message sending times to ensure simultaneous reception of user plane messages without the need for additional buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the FHM waits to receive all messages from RUs before generating the uplink message, then message synchronization is achieved, but path delay differences cause reception time mismatches requiring additional buffering
Solution Approach 1:
The FHM sends control plane messages to RUs in advance based on calculated path delays, enabling RUs to prepare and send user plane messages that will arrive simultaneously at the FHM, eliminating the need for buffering
Solution Approach 2:
The system dynamically adjusts the sending time of control plane messages to each RU based on its specific path delay parameter, ensuring that all RUs transmit user plane messages at synchronized moments despite different transmission distances
2Ease of operation
If the FHM sends control plane messages to RUs simultaneously, then operation simplicity is maintained, but unequal path lengths cause message reception time differences
Solution Approach 1:
The system modifies the sending time parameter of control plane messages based on the path delay of each RU, compensating for transmission distance differences and achieving simultaneous user plane message reception at the FHM
Data Source
AI summary
A delay compensation method and device are provided. The method includes: obtaining a control plane message; obtaining a path delay of each of multiple radio units, and determining a compensation time length corresponding to each of the radio units based on a reference path delay and the path delay of each of the radio units; and sending the control plane message to each of the radio units based on the compensation time length corresponding to each of the radio units.