Distributed Wireless Terminal Synchronization Contention Window Adjustment
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Solution Overview
Problem
In distributed wireless communication systems, densely populated terminals experience synchronization signal collisions and errors due to overlapping signals, and heterogeneous networks face interference and signal loss when using the same radio channel, leading to inefficient network performance.
Innovation Solution
A method where a first terminal adjusts its contention window value based on the receipt of synchronization signals, increasing it if signals are received and decreasing it if not, using a backoff counter and average contention window values to prevent collisions and optimize synchronization signal transmission, including a processor to manage these adjustments and determine whether to transmit synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals densely populate the network and transmit synchronization signals simultaneously, then network coverage and synchronization capability are improved, but signal collisions and estimation errors increase
Solution Approach 1:
The terminal performs preliminary actions by adjusting the contention window value before transmitting the synchronization signal. When a synchronization signal is detected from another terminal, the terminal increases its contention window value in advance, which delays its own transmission timing and avoids collision with the detected signal.
Solution Approach 2:
The terminal uses feedback from received synchronization signals to dynamically adjust its transmission behavior. By detecting synchronization signals from neighboring terminals and responding by modifying the contention window value, the system creates a feedback mechanism that coordinates transmissions and reduces collisions in dense networks.
2Measurement precision
If terminals transmit synchronization signals frequently to maintain synchronization, then synchronization accuracy is improved, but the probability of signal collision increases
Solution Approach 1:
The contention window value is made dynamic rather than fixed. The terminal adjusts the contention window size based on the detection of other synchronization signals, allowing the system to adapt transmission timing to current network conditions. This dynamic adjustment maintains synchronization accuracy while reducing collision probability.
3Stability of the object's composition
If terminals use a fixed reference clock for synchronization, then synchronization stability is improved, but the system complexity and infrastructure requirements increase
Solution Approach 1:
Terminals perform self-synchronization by detecting and using synchronization signals from other terminals in the network, rather than relying on a centralized base station. Each terminal independently adjusts its contention window and transmission timing based on what it detects, enabling distributed synchronization without complex centralized infrastructure.
Data Source
AI summary
A method of synchronization in a distributed wireless communication system and a terminal supporting the same are disclosed. A terminal increases its contention window value if it receives a synchronization signal within a synchronization slot. The terminal decreases its contention window value if it receives no synchronization signal within the synchronization slot. The terminal determines whether to transmit a synchronization signal or not by using the increased or decreased contention window value.