Radio Control Device Delay Control for CPRI Synchronization
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Solution Overview
Problem
In wireless communication systems, the transmission delay between radio control devices and radio devices connected via CPRI interfaces can lead to synchronization loss and momentary interruptions, causing quality deterioration due to unsynchronized data transmission timing.
Innovation Solution
A radio control device with a first delay unit that performs delay control on radio data in units of basic frames based on a desired data transmission timing, and a radio data multiplexing unit that multiplexes the delayed data to ensure accurate transmission timing, eliminating the need for changing the CPRI frame transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If delay control is performed on radio data using conventional methods, then data transmission timing can be adjusted, but synchronization is lost and momentary interruptions occur
Solution Approach 1:
The invention segments the delay control process into two distinct parts: (1) delay control on radio data before multiplexing, and (2) delay control on basic frames after multiplexing. This segmentation allows the radio data to be delayed without affecting the synchronization of the entire CPRI frame structure, thereby preventing momentary interruptions while achieving precise transmission timing control.
Solution Approach 2:
The invention performs preliminary delay control on radio data before it is multiplexed into the CPRI frame structure. By adjusting the timing of radio data in advance, the system can compensate for transmission delays without needing to alter the transmission timing of the synchronized CPRI frames, thus maintaining synchronization stability while achieving desired data transmission timing.
2Loss of time
If CPRI frame transmission timing is changed to control data transmission timing, then transmission timing can be adjusted, but system complexity increases
Solution Approach 1:
The invention extracts the delay control function from the CPRI frame transmission timing control mechanism. Instead of changing the transmission timing of synchronized CPRI frames, the system applies delay control specifically to the radio data portion before multiplexing. This separation allows timing adjustment without increasing system complexity or affecting the synchronized frame structure.
3Measurement precision
If transmission delay is less than one chip, then precise timing control is needed, but conventional delay units cannot achieve sufficient precision
Solution Approach 1:
The invention introduces a dynamic delay control mechanism that can adjust delay amounts in units of one chip or less. The delay control unit dynamically modifies the timing of radio data based on the specific delay requirement, enabling precise control for sub-chip timing adjustments without requiring a complete redesign of the delay mechanism.
Solution Approach 2:
The invention changes the delay parameter resolution from one chip to one chip or less. By modifying the granularity of delay control to be finer than the traditional chip unit, the system achieves precise timing control for small transmission delays while maintaining compatibility with the existing CPRI frame structure through the multiplexing approach.
Data Source
AI summary
A radio control device that can eliminate quality deterioration in a wireless communication system is provided. The radio control device (REC) includes a first delay unit configured to perform delay control based on a first delay time less than a unit processing time of a basic frame, on radio data in units of the basic frames of a CPRI (Common Public Radio Interface) frame, based on a desired data transmission timing in a radio device, and a radio data multiplexing unit configured to multiplex the radio data that has undergone the delay control to the basic frame.