Full Duplex Wireless Device Packet Collision Avoidance
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Solution Overview
Problem
In full duplex wireless communication systems, packet collisions occur due to simultaneous transmission and reception, leading to interference between uplink and downlink communications, which can result in failed receptions at wireless communication terminals.
Innovation Solution
Incorporating propriety information in packet headers and data parts to indicate reception possibility or impossibility, allowing wireless communication devices to adjust transmission timing and avoid collisions by setting random waiting times and refraining from transmission when interference thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to enable simultaneous transmission and reception, then frequency utilization efficiency is improved, but packet collision occurs between uplink and downlink communications
Solution Approach 1:
The base station transmits propriety information in advance within downlink packets to inform wireless communication terminals about the possibility of simultaneous uplink transmission. This allows terminals to prepare their transmission timing beforehand, preventing packet collisions before they occur while maintaining full duplex operation
Solution Approach 2:
The base station provides feedback information (propriety information) to terminals regarding the appropriateness of their transmission timing. This feedback mechanism enables terminals to adjust their transmission behavior based on current channel conditions, resolving the conflict between simultaneous transmission and collision avoidance
2Productivity
If multiple wireless communication terminals perform uplink communication simultaneously to the base station, then communication efficiency is improved, but packet collision occurs between terminals
Solution Approach 1:
The base station changes the parameter of transmission timing by controlling the transmission timing of propriety information. By strategically timing when propriety information is sent to different terminals, the base station coordinates their uplink transmissions to avoid collisions while maintaining high communication efficiency
Data Source
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AI summary
The present technology relates to a wireless communication device, a wireless communication terminal, and a wireless communication method that allow to avoid collision between packets in full duplex communication. In a wireless communication system including a wireless communication device that functions as a base station, and one or more wireless communication terminals that communicate with the wireless communication device as slave units, a controller in the wireless communication device sets propriety information indicating whether or not reception of a packet transmitted from the wireless communication terminals is possible during a downlink transmission period when the wireless communication device transmits a packet, and a communication section in the wireless communication device transmits the packet including the propriety information. Furthermore, a controller in the wireless communication terminal controls transmission of the packet to the wireless communication device, during the downlink transmission period when the wireless communication device transmits the packet, according to the propriety information included in the packet, the propriety information indicating whether or not reception of the packet transmitted from the wireless communication terminals is possible. The present technology is applicable to, for example, a wireless communication device supporting full duplex communication.