Relay Station Frame Synchronization via Bidirectional Zone Timing
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Solution Overview
Problem
The implementation of bidirectional transmit and receive zones in IEEE 802.16 networks violates time division duplex synchronization for data frames, necessitating adjustments in frame timing and synchronization to maintain effective data transmission between relay stations and other wireless nodes.
Innovation Solution
The proposed solution involves delaying or advancing the start time of frames at relay stations, modifying transition times, and instructing subordinate stations to adjust their timing, ensuring that data symbols are received and transmitted simultaneously with superordinate stations, thus synchronizing frames across multiple zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bidirectional transmit and receive zones are implemented at relay stations, then network capacity and data transmission efficiency are improved, but frame synchronization between relay stations and superordinate/subordinate stations is violated
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-configuring modified transition times (TTG and RTG) before bidirectional zone operations begin. The relay station determines the appropriate transition time adjustments based on propagation delays to superordinate and subordinate stations, and these modified values are prepared in advance to ensure frame synchronization is maintained from the outset of bidirectional operations
Solution Approach 2:
The patent directly applies parameter changes by modifying the transition time parameters (TTG and RTG) between zones. Instead of using nominal transition times, the system adjusts these parameters to account for the bidirectional zone configuration and propagation delays, thereby maintaining frame synchronization while enabling simultaneous transmit and receive operations
2Measurement precision
If transition times are modified to achieve frame synchronization, then synchronization accuracy is improved, but frame timing complexity increases
Solution Approach 1:
The patent implements feedback by having the relay station continuously monitor and measure actual propagation delays to both superordinate and subordinate stations. Based on this feedback information, the system dynamically determines and adjusts the modified transition times (TTG and RTG) to maintain accurate frame synchronization, ensuring that synchronization accuracy adapts to changing network conditions
Data Source
AI summary
Methods and apparatus for synchronizing frames in wireless networks are disclosed. An example method includes delaying, at a wireless relay station, a start time of a frame. In the example method, the start time of the frame is delayed, such that the relay station receives one or more data symbols from a superordinate wireless station and one or more data symbols from a subordinate wireless station at substantially the same time during the frame.