Access Point Synchronization via Frequency Offset Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cooperative transmission methods in wireless communication networks face high overhead and low work efficiency due to synchronization, data sharing, channel information acquisition, and data transmission challenges, limiting their application scenarios.
Innovation Solution
A method and device that compensate phase or time differences by calculating and adjusting frequency and delay differences between crystal oscillators of access points, enabling synchronized data transmission and improved channel matrix calculations for efficient data sharing and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cooperative transmission is implemented with multiple access points, then network throughput is improved, but overhead and complexity increase
Solution Approach 1:
A primary access point is designated as an intermediary that centralizes the synchronization function. Other access points synchronize with this primary AP rather than each other, reducing the complexity of inter-AP synchronization while enabling cooperative transmission across multiple APs.
Solution Approach 2:
The system implements feedback mechanisms where access points report their timing and frequency offset information to the primary AP. The primary AP then provides correction information back to the other APs, enabling continuous synchronization adjustment and maintaining coordinated transmission.
2Reliability
If crystal oscillator frequency differences between access points are not compensated, then device complexity is reduced, but transmission synchronization deteriorates
Solution Approach 1:
The patent replaces complex hardware-based frequency synchronization mechanisms with software-based frequency offset estimation and compensation algorithms. By using signal processing techniques to measure and correct frequency differences, the system achieves synchronization without requiring precise hardware frequency matching across all APs.
Solution Approach 2:
Each access point autonomously measures its own frequency offset relative to the primary AP and applies self-correction. This self-service approach eliminates the need for centralized frequency control hardware while maintaining synchronization reliability across the distributed network.
3Productivity
If channel information is shared between multiple access points, then cooperative transmission efficiency is improved, but information security and overhead increase
Solution Approach 1:
The patent extracts only the essential channel information parameters needed for cooperative transmission (such as channel state indicators and precoding information) rather than sharing complete channel matrices. This selective extraction reduces the amount of information that needs to be exchanged while maintaining the efficiency benefits of cooperative transmission.
Data Source
AI summary
The present disclosure provide a transmission method and a device, which relate to the technical field of communications and reduce overhead and improve work efficiency in an application of cooperative transmission in aspects of synchronization, sharing of information such as data and the like, obtaining of channel information and data transmission. Meanwhile application scenarios may also be extended. The method specifically includes: obtaining, by an access point AP, a parameter value, wherein the parameter value is a frequency difference between a crystal oscillator frequency of the AP and a reference crystal oscillator frequency of a reference AP or a delay difference of the AP with respect to the reference AP; compensating, by the AP, a phase difference or a time difference according to the parameter value when both of the AP and the reference AP send data. The present disclosure is applied to an application of a cooperative transmission.