Communication Devices with Dual-Channel Collision Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in unlicensed bands due to the hidden-node problem and congestion, leading to collisions and high overhead for collision resolution, which hinder low-latency communication.
Innovation Solution
Implementing a two-channel system where one channel is for contention and data exchange, and the other is for collision resolution, with collision information transmitted on the second channel to prevent or minimize collisions by enabling communication devices to detect and adapt their channel access behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk (LBT) is implemented to avoid collisions, then collision avoidance is improved, but hidden-node problems persist and congestion increases
Solution Approach 1:
A dedicated collision information channel is introduced as an intermediary between the data channel and the collision detection mechanism. This separate channel carries collision information from receiving devices to transmitting devices, enabling reliable collision detection without interfering with the data transmission flow on the original channel.
Solution Approach 2:
The communication channel is segmented into two distinct channels: a data channel for normal communication and a collision information channel for transmitting collision status. This segmentation allows collision information to be transmitted separately without competing with data traffic, thus maintaining data throughput while improving collision detection reliability.
2Reliability
If collision resolution mechanisms are implemented, then collision handling is improved, but overhead increases and latency increases
Solution Approach 1:
Collision information is transmitted proactively on the dedicated channel as soon as a receiving device detects channel occupancy or collision. This preliminary action allows transmitting devices to detect collision status before attempting retransmission, avoiding the need for lengthy collision resolution protocols and reducing latency.
Solution Approach 2:
A feedback mechanism is established where receiving devices send collision information back to transmitting devices on the dedicated channel. This feedback loop enables transmitting devices to adapt their transmission behavior based on real-time collision status, improving collision resolution efficiency without adding significant overhead.
3Device complexity
If a single channel is used for data transmission, then device complexity is reduced, but collision detection capability is insufficient
Solution Approach 1:
The system transitions from a single-dimensional channel (one channel for both data and control) to a two-dimensional channel structure (data channel plus collision information channel). This dimensional change enables simultaneous data transmission and collision information exchange without interfering with each other, improving collision detection capability while maintaining manageable device complexity.
Data Source
AI summary
A first communication device comprising circuitry configured to exchange data with one or more second communication devices on a first communication channel, and transmit collision information on a second communication channel that is a different channel than the first communication channel, wherein the circuitry is configured to transmit said collision information if there is a collision on the first communication channel or if the first communication channel is occupied by data transmission of a second communication device, said collision information indicating that there is a collision on the first communication channel or that the first communication channel is occupied.