Full-Duplex Node Sweeping Transmission and Reception
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Solution Overview
Problem
In wireless communication systems, full-duplex nodes face interference issues due to unawareness of nearby transmissions, leading to 'deafness' and potential interference, especially in millimeter wave frequencies where signal attenuation and physical obstructions exacerbate the problem.
Innovation Solution
Implementing a method where wireless nodes transmit directional signals in a sweeping pattern while receiving, and listen in a sweeping manner while transmitting, to detect potential interference and adjust transmission accordingly, using techniques like listen-before-talk (LBT) to avoid conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex nodes transmit and receive simultaneously in the same direction, then spectral efficiency is improved, but self-interference and deafness occur
Solution Approach 1:
The patent segments the transmission and reception operations by introducing separate listening periods and transmission periods. During listening periods, nodes perform LBT procedures in specific directions before transmitting. This temporal segmentation allows nodes to be aware of surrounding communications while maintaining full-duplex operation, thereby resolving the deafness problem while preserving spectral efficiency.
Solution Approach 2:
The patent implements preliminary listening actions before transmission. Nodes perform LBT procedures during listening periods to detect ongoing transmissions in their vicinity before initiating their own transmissions. This preliminary awareness prevents interference and deafness, allowing reliable full-duplex operation to proceed.
2Reliability
If nodes use directional beamforming to increase signal strength, then communication reliability is improved, but interference to other nodes increases
Solution Approach 1:
The patent applies local quality by having nodes transmit directional signals only in specific directions during sweeping patterns, rather than omnidirectionally. Each node adapts its transmission characteristics (direction, timing) based on local conditions detected during LBT procedures. This localized approach maintains communication reliability while reducing interference to nodes in other directions.
Solution Approach 2:
The patent introduces dynamic behavior through sweeping transmission patterns and periodic listening intervals. Nodes dynamically adjust their transmission directions and timing based on detected environmental conditions. This dynamic adaptation allows the system to maintain reliable directional communications while minimizing interference through temporal and spatial variability.
3Reliability
If nodes perform LBT procedures to detect interference, then interference avoidance is improved, but transmission delays increase
Solution Approach 1:
The patent implements periodic listening and transmission cycles with predetermined patterns. Nodes perform LBT procedures at regular intervals during listening periods rather than continuously, and transmissions occur during designated transmission periods. This periodic structure provides predictable timing that reduces average delays compared to continuous monitoring, while still maintaining effective interference avoidance.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless node may transmit directional signals in a sweeping transmission pattern while receiving communications from a second wireless node. Another wireless node may then, during a listen-before-talk (LBT) procedure, receive one of the directional signals, and terminate a correspondence communication session to avoid potential interference. Additionally or alternatively, a wireless node may listen in directions in a sweeping receive pattern while transmitting to a second wireless node. While listening, the wireless node may detect a transmission from a third wireless node in a particular direction. The wireless node may then accordingly refrain from transmitting in that direction to avoid potential interference.