Collision Detection via Acknowledgment Packet Distribution Analysis
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Solution Overview
Problem
Current collision detection methods in wireless communication systems, such as CSMA and CA, are inadequate in completely avoiding collisions and interference, especially in scenarios with shared limited bandwidth channels like WiFi 2 GHz/5 GHz free channels, leading to frequent collisions.
Innovation Solution
A communication device equipped with a radio transceiver and a collision detection device that analyzes acknowledgment packets to determine collision occurrence by assessing the distribution of acknowledgment information, using a sliding window to calculate error concentrations and adjust transmission parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSMA and CA mechanisms are used to avoid collisions, then collision avoidance capability is improved, but collision detection capability deteriorates
Solution Approach 1:
The patent implements feedback by analyzing acknowledgment packets returned from receivers to detect collisions. The transmitter monitors the distribution of acknowledgment statuses in the received acknowledgment packet, and when collision is detected, it adjusts transmission parameters such as transmission power or modulation scheme for subsequent transmissions, creating a closed-loop system that improves reliability through continuous adaptation.
2Reliability
If transmission parameters are adjusted to reduce collisions, then collision occurrence is reduced, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies partial action by adjusting transmission parameters only for specific packets or subframes where collision is detected, rather than reducing parameters for all transmissions. The system maintains high transmission efficiency for packets without collision while applying conservative parameters only when necessary, thus reducing overall collision occurrence without significantly degrading transmission efficiency.
3Measurement precision
If acknowledgment information is analyzed in detail to detect collisions, then collision detection accuracy is improved, but processing complexity deteriorates
Solution Approach 1:
The patent segments the acknowledgment packet into individual acknowledgment statuses corresponding to different transmitted packets or subframes. By analyzing the distribution pattern of these segmented acknowledgment statuses (e.g., counting consecutive NACKs or analyzing spatial distribution), the system achieves accurate collision detection while keeping processing complexity manageable through structured analysis rather than exhaustive processing.
Data Source
AI summary
A communication device includes a radio transceiver and a collision detection device. The radio transceiver is configured to receive a wireless signal which includes an acknowledgment packet from a wireless communication channel. The acknowledgment packet includes acknowledgment information which corresponds to a plurality of transmitted packets. The collision detection device is coupled to the radio transceiver and configured to receive the acknowledgment packet, determine whether collision has occurred in the wireless communication channel according to the acknowledgment information corresponding to the transmitted packets and accordingly generate a detection result. The collision detection device determines whether collision has occurred according to a distribution of the acknowledgment information having a predetermined acknowledgment status. When the collision detection device determines that the acknowledgment information having the predetermined acknowledgment status is concentrated in a section of the acknowledgment packet, the detection result indicates that collision has occurred.