MAC Frame Timing Alignment for Fiber-Delayed Downlink Transmission
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Solution Overview
Problem
Existing downlink data transmission methods in wireless access networks require large buffers and result in low throughput due to optical fiber delay compensation, especially in long-distance and multi-antenna scenarios, leading to increased hardware costs and power consumption.
Innovation Solution
Adjust the frame starting time of the Media Access Control (MAC) exit based on the sum of optical fiber transmission delay and downlink processing delay to compensate for optical fiber length without additional buffers, thereby optimizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical fiber delay compensation buffer is inserted into the link after downlink bit-level processing, then the transmission delay can be compensated, but the buffer overhead increases hardware costs and power consumption
Solution Approach 1:
The patent extracts the delay compensation function from the physical layer bit-level processing stage and relocates it to the MAC layer frame structure. By removing the need for large compensation buffers and implementing delay compensation through frame timing alignment at the MAC exit, the solution eliminates the harmful buffer overhead while maintaining transmission delay compensation capability.
Solution Approach 2:
The patent replaces the mechanical buffer-based delay compensation system with a timing-based MAC layer synchronization mechanism. Instead of using physical buffers to hold data for delay compensation, the system uses frame starting time alignment and MAC layer timing control to achieve the same delay compensation effect without the hardware overhead.
2Reliability
If an optical fiber delay compensation buffer is inserted into the link, then transmission delay can be compensated, but device complexity increases
Solution Approach 1:
The patent extracts the delay compensation function from the physical layer bit-level processing stage and relocates it to the MAC layer frame structure. By removing the need for large compensation buffers and implementing delay compensation through frame timing alignment at the MAC exit, the solution eliminates the harmful buffer overhead while maintaining transmission delay compensation capability.
3Speed
If the processing time of each baseband component is reduced in long-distance scenario, then transmission speed increases, but throughput of bit-level Turbo/Ldpc/Polar coding decreases
Solution Approach 1:
The patent performs preliminary timing alignment and delay compensation at the MAC layer before data enters the physical layer processing pipeline. By pre-synchronizing the frame starting times and compensating for optical fiber delays at the MAC exit, the system ensures that subsequent bit-level processing operations can proceed without interruption or reprocessing, maintaining both high speed and high throughput.
Data Source
AI summary
A downlink data transmission method and apparatus, a storage medium, and an electronic device are disclosed. The method may include: determining a transmission delay, where the transmission delay includes a sum of an optical fiber transmission delay and a downlink processing delay from a Media Access Control (MAC) exit to an air interface (S102); determining a frame starting time of the MAC exit according to the transmission delay (S104); and transmitting downlink data according to the frame starting time (S106).