Autonomous Transmission Coordination Indicator for Wireless Interference
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Solution Overview
Problem
High-capacity wireless networks face channel interference issues due to directional transmission, leading to hidden node, exposed node, and deafness problems, which are not effectively addressed by existing listen-before-talk protocols, particularly in new radio systems.
Innovation Solution
Implementing a coordination indicator system that allows source network devices to transmit data autonomously when scheduled, without waiting for resource permission, and using fast acknowledgments and resource coordination zones to manage interference, enabling efficient channel usage and reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk protocol is used for channel access control, then channel interference is managed, but transmission efficiency deteriorates due to hidden node, exposed node, and deafness problems in directional transmission systems
Solution Approach 1:
The patent inverts the traditional LBT approach by implementing listen-after-talk (LAT) protocol. Instead of listening before transmission, the system transmits first and then listens for acknowledgments or interference signals. This inversion resolves the hidden node problem because the transmitting node can directly detect whether its transmission was successfully received, eliminating the need for complex channel sensing before directional transmission.
Solution Approach 2:
The patent implements a feedback mechanism where receiving nodes send acknowledgments or interference indication signals back to transmitting nodes. This feedback loop allows the system to manage channel interference effectively while maintaining high transmission efficiency, as nodes can adjust their behavior based on real-time feedback about channel conditions and successful transmissions.
2Productivity
If directional beamforming with massive antennas is implemented, then network throughput is increased, but channel interference resolution becomes more difficult due to hidden terminal problems
Solution Approach 1:
The patent enables transmitting nodes to self-assess channel conditions by monitoring whether they receive acknowledgments from receiving nodes. This self-service mechanism eliminates the need for complex channel sensing infrastructure, allowing directional beamforming systems to maintain high throughput while automatically resolving hidden terminal problems through the feedback-based LAT protocol.
3Speed
If autonomous transmission is enabled, then transmission speed is improved, but channel collision increases without proper coordination
Solution Approach 1:
The patent uses feedback mechanisms where receiving nodes send interference indication signals when channel collisions are detected. This allows autonomous transmitting nodes to quickly adapt their behavior based on real-time channel conditions, maintaining high transmission speeds while dynamically adjusting to avoid or resolve collisions through the LAT protocol's acknowledgment and interference indication system.
Data Source
AI summary
Method and apparatus of a source network device and a destination network device for autonomous transmission are provided in this disclosure. In a source network device, a coordination indicator and a portion of data is transmitted to the destination network device, the coordination indicator identifying a resource coordination zone to coordinate interference resolution. Then, the source network device determines whether an acknowledgement is received from the destination device prior to an allocation of its repeated transmission. When a message is detected in the resource coordination zone and the acknowledgement is received, the source device transmits a further portion of the data to be transmitted. Problem arising from channel interference can be resolved through the provided methods.