Full Duplex Radio Carrier Sense with Source Identification
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Solution Overview
Problem
Conventional Carrier Sense Multiple Access (CSMA) / Collision Avoidance (CA) schemes face challenges in leveraging the resource efficiency offered by bidirectional full duplex (BFD) communication, as they struggle to differentiate between transmission activities from BFD peers and other radio devices, leading to inefficient use of radio resources.
Innovation Solution
Implementing a method where radio devices perform carrier sense (CS) and collision detection (CD) operations aware of BFD communication by distinguishing between transmission activities from BFD peers and other devices, using control information and orthogonal sequences to coordinate sensing and silence periods, allowing for efficient access and collision handling on shared carrier frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CSMA/CA schemes are used in BFD communication, then collision avoidance is provided, but false occupation detection occurs due to inability to differentiate between BFD peer transmissions and other device transmissions
Solution Approach 1:
The patent introduces control information as an intermediary that carries identification data about transmission sources. This control information enables receiving devices to distinguish between transmissions from BFD peers and other devices, resolving the false occupation detection problem in CSMA/CA schemes while maintaining collision avoidance functionality
Solution Approach 2:
The patent segments the transmission identification problem by separating BFD peer transmissions from other device transmissions through the use of control information. This segmentation allows the system to selectively ignore BFD peer transmissions during carrier sensing while still detecting transmissions from other devices, thereby preventing false occupation detection
2Productivity
If bidirectional full duplex communication is implemented, then resource efficiency is improved, but differentiation between transmission sources becomes difficult
Solution Approach 1:
Control information serves as an intermediary that provides transmission source identification in BFD communication. This enables devices to maintain high resource utilization efficiency through simultaneous bidirectional transmissions while accurately distinguishing between BFD peer transmissions and transmissions from other devices
Solution Approach 2:
The patent applies local quality by assigning specific identification characteristics to transmissions from BFD peers through control information. This allows receiving devices to locally differentiate between BFD peer transmissions (which can be ignored during carrier sensing) and other device transmissions (which should trigger deferral), thereby maintaining both high resource efficiency and accurate source detection
3Ease of operation
If carrier sensing is performed without BFD awareness, then simple detection is achieved, but false occupation detection prevents efficient resource use
Solution Approach 1:
The patent introduces dynamic BFD awareness into the carrier sensing process. The carrier sensing operation adapts its behavior based on whether the detected transmission is from a BFD peer or another device, as identified through control information. This dynamic adjustment maintains the simplicity of carrier sensing while eliminating false occupation detection, thereby improving radio resource efficiency
Data Source
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Figure 5A~5B
AI summary
A radio device (10) configures a full duplex radio link from the radio device (10) to a further radio device (100). The full duplex radio link supports simultaneous bidirectional transmission on a carrier frequency. Further, the radio device (10) detects transmission activity on the carrier frequency. The radio device (10) determines whether the detected transmission activity is by the further radio device (100). Depending on whether the detected transmission activity is by the further radio device (100), the radio device (10) controls its own transmission activity on the carrier frequency.