Full-Duplex Node Directional Sweep Interference Avoidance
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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' where a node is unaware of surrounding communications while transmitting, causing potential interference with other nodes.
Innovation Solution
Implementing a method where wireless nodes transmit directional signals in a sweeping pattern while receiving, and listen in a sweeping receive pattern while transmitting, to detect potential interference and avoid it by refraining from transmitting in conflicting directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless node transmits directional signals continuously to maintain communication, then communication reliability is improved, but the node becomes unaware of surrounding transmissions causing interference
Solution Approach 1:
The patent implements periodic transmission sweeps where the wireless node temporarily transmits directional signals in different directions at regular intervals. This periodic action allows the node to maintain communication reliability through structured transmission patterns while creating opportunities to detect surrounding transmissions that would cause interference.
Solution Approach 2:
The patent performs preliminary detection of surrounding transmissions before initiating or continuing transmission. By listening for potential interfering signals in advance and checking transmission opportunities beforehand, the node can avoid starting transmissions that would cause or receive interference, thus maintaining reliability while staying aware of the environment.
2Loss of information
If a wireless node listens in all directions to detect interference, then awareness of surrounding transmissions is improved, but communication efficiency deteriorates due to transmission delays
Solution Approach 1:
The patent applies local quality by directing transmission and listening efforts toward specific spatial directions rather than uniformly in all directions. The node performs transmission sweeps and listening in targeted directional beams, concentrating detection and transmission resources where they are most needed based on the spatial distribution of other wireless nodes and potential interference sources.
Solution Approach 2:
The patent segments the transmission and listening process into discrete directional sweeps rather than continuous omnidirectional operation. By dividing the 360-degree space into multiple directional sectors and sequentially sweeping through them, the node can efficiently detect interference in each direction without requiring continuous listening in all directions simultaneously, thus maintaining awareness while improving communication efficiency.
3Loss of information
If a wireless node performs transmission sweeps in multiple directions, then awareness of interference is improved, but the time required for communication increases
Solution Approach 1:
The patent implements periodic transmission sweeps at optimized intervals rather than continuous omnidirectional listening. By performing directional sweeps periodically at strategically determined time intervals, the node can detect interfering signals in multiple directions while minimizing the total time spent on detection activities, thus balancing interference awareness with communication timeliness.
Solution Approach 2:
The patent performs preliminary checks for transmission opportunities and interference detection before initiating transmission sequences. By checking for potential interference in advance and validating transmission opportunities beforehand, the node can avoid unnecessary transmission delays caused by last-minute interference detection, thus reducing overall transmission time while maintaining adequate interference awareness.
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.