Wireless Communication Apparatus Adaptive Contention Window
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Solution Overview
Problem
In wireless communication systems, the existing methods for controlling data transmission intervals lead to reduced overall throughput due to collisions and inefficiencies in managing contention windows, especially when traffic volume changes rapidly or when the number of wireless communication devices is high.
Innovation Solution
A wireless communication apparatus and method that dynamically control data transmission intervals by using a random number range and back-off time mechanism, where the contention window is expanded upon collisions and initialized at optimized intervals based on the number of devices on the network, rather than immediately after successful retransmissions or ACK signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the contention window is initialized immediately after successful retransmission, then the data transmission interval is shortened, but collisions increase and overall throughput decreases
Solution Approach 1:
The patent applies dynamics by making the contention window initialization timing adaptive rather than fixed. The initialization is delayed until a predetermined time interval elapses after successful retransmission, allowing the system to dynamically adjust the balance between transmission speed and collision avoidance based on actual network conditions and device behavior patterns.
Solution Approach 2:
The patent implements preliminary action by introducing a predetermined time interval counter that starts counting from the moment of successful retransmission. This counter prevents immediate initialization of the contention window, thereby avoiding collisions that would occur if multiple devices simultaneously restarted their transmission cycles. The preliminary counting period ensures that transmission intervals are properly spaced before initialization occurs.
2Reliability
If the contention window is expanded upon collisions, then collision avoidance improves, but data transmission intervals become too long and throughput decreases
Solution Approach 1:
The patent applies feedback by monitoring collision occurrences and adjusting the contention window size accordingly. When collisions are detected, the contention window is expanded to reduce collision probability. However, the system also tracks the predetermined time interval counter, which provides feedback on transmission timing patterns, allowing the system to optimize the balance between collision avoidance and transmission throughput.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the contention window size based on collision detection. The contention window parameter is changed from its initial value when collisions occur, thereby adapting the system's collision avoidance mechanism to current network conditions while maintaining efficient transmission intervals through the predetermined time interval control.
3Productivity
If multiple wireless communication devices transmit data simultaneously, then network utilization increases, but collisions occur and throughput decreases
Solution Approach 1:
The patent applies preliminary action by implementing a predetermined time interval counter that prevents multiple devices from simultaneously initiating transmission cycles. This counter ensures that even when multiple devices have data to transmit, their transmission intervals are properly staggered, thereby increasing network utilization while preventing collisions that would reduce throughput.
Solution Approach 2:
The patent implements periodic action through the predetermined time interval counter that operates on a periodic basis. The counter resets and advances in regular intervals, creating a rhythmic pattern of transmission opportunities. This periodic control mechanism allows multiple devices to access the network efficiently while maintaining reliable data transmission by preventing simultaneous collisions.
Data Source
AI summary
A wireless communication apparatus includes a random number range holding unit configured to hold a random number range, a random time setting unit configured to set a random time based on the random number range, a random time counting unit configured to count the random time starting from a particular time only when the radio communication channel is not used, a transmitting unit configured to transmit data via the radio communication channel when counting of the random time was completed, a time counting unit configured to count a particular time, and a random number range control unit configured to control the random number range such that when data transmitted by the transmitting unit over the radio communication channel collides with another data, the random number range is expanded, while when the particular time has been counted by the time counting unit, the random number range is initialized.