Mesh TDD Synchronization Using Beacon Pattern Timing Alignment
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Solution Overview
Problem
Conventional Wi-Fi systems lack precise Time Division Duplexing (TDD) synchronization across mesh nodes, leading to uplink and downlink collisions, increased latency, and reduced throughput, especially in dynamic environments, and existing solutions like GPS-based synchronization or IEEE 1588 Precision Time Protocol are inadequate or costly.
Innovation Solution
Implement pattern-based TDD synchronization using extended WLAN beacons with embedded synchronization parameters, allowing each repeater device to align with a prestored pattern and iteratively adjust local oscillator timing for precise timing coordination across the mesh network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-based synchronization is used, then timing accuracy is improved, but hardware cost and power consumption increase
Solution Approach 1:
The patent creates a virtual copy of GPS timing functionality by implementing a software-based TDD synchronization mechanism that replicates the timing accuracy of GPS without requiring physical GPS receivers. The system uses virtual timing references and software-controlled time slot synchronization to achieve the same effect as GPS synchronization, thereby eliminating the need for expensive GPS hardware while maintaining timing precision.
Solution Approach 2:
The patent replaces the mechanical/GPS-based hardware synchronization system with a software-based wireless communication system. Instead of using physical GPS receivers and hardware timing circuits, the invention implements synchronization through software processing of wireless signals, using virtual timing references and algorithmic time slot alignment to achieve precise TDD coordination without mechanical or specialized hardware components.
2Measurement precision
If IEEE 1588 PTP is used, then timing precision is improved, but reliability deteriorates over wireless links with jitter
Solution Approach 1:
The patent implements dynamic time slot allocation and adaptive synchronization mechanisms that adjust to changing wireless conditions in real-time. The system dynamically modifies time slot boundaries, guard intervals, and synchronization parameters based on current channel quality, interference levels, and jitter characteristics, allowing the TDD system to maintain reliable synchronization despite varying wireless link conditions that would cause PTP to fail.
Solution Approach 2:
The patent incorporates feedback mechanisms where receiving nodes monitor timing alignment quality and transmit correction information back to transmitting nodes. The system uses uplink feedback channels to report synchronization status, timing offsets, and collision detection information, enabling continuous refinement and adjustment of time slot synchronization to maintain reliability over jitter-prone wireless links.
3Object-generated harmful factors
If TDD synchronization is implemented in dense mesh deployments, then uplink and downlink collisions are reduced, but device complexity increases
Solution Approach 1:
The patent segments the wireless medium into distinct, non-overlapping time slots for uplink and downlink transmissions across multiple mesh nodes. By dividing the communication timeline into carefully coordinated segments with guard intervals, the system prevents simultaneous uplink and downlink transmissions that would cause collisions, allowing dense mesh deployments to operate without interference while managing complexity through structured time division.
Solution Approach 2:
The patent implements preliminary synchronization procedures where mesh nodes exchange timing information and establish time slot boundaries before actual data transmission begins. The system performs initial time alignment, collision detection, and parameter negotiation in a setup phase, allowing the main data transmission phase to proceed without complex real-time coordination, thereby reducing operational complexity while preventing collisions.
Data Source
AI summary
A system for enhanced time division duplexing (TDD) synchronization in a wireless mesh network includes a master access point device and a plurality of repeater devices. The master access point device propagates a first extended wireless local area network (WLAN) beacon to plurality of repeater devices in a specific order based on network topology mapping information. The first extended WLAN beacon includes a first synchronization pattern. A first repeater device receives the first extended WLAN beacon and compares the first synchronization pattern with a prestored synchronization pattern. The first repeater device iteratively adjusts the timing of a local oscillator based on signal strength or signal-to-noise ratio measurements until the patterns match with the prestored synchronization pattern. The first repeater device locks TDD signal timing at the first repeater device based on the first synchronization pattern that matches with the prestored synchronization pattern.