Full-Duplex Rate Adaptation via Channel Quality Feedback
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Solution Overview
Problem
Existing full-duplex wireless communication systems face performance degradation due to mobile users, as traditional rate adaptation methods based on packet losses lead to many unsuccessful transmissions, degrading user experience.
Innovation Solution
Implementing a method where computing devices in a full-duplex wireless network exchange channel quality information (CQI) to dynamically adjust data transmission rates, allowing for simultaneous data transmission and reception on the same frequency band by selecting optimal Modulation and Coding Scheme (MCS) values based on received CQI, thereby maintaining optimal throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rate adaptation is based on packet losses, then transmission rates can be adjusted, but many unsuccessful transmissions occur when users are mobile, degrading performance
Solution Approach 1:
The system implements feedback mechanisms where receiving devices send channel quality information (CQI) back to transmitting devices. This feedback loop enables rate adaptation based on actual channel conditions rather than packet loss, improving both adaptability and reliability by using direct quality measurements instead of indirect loss-based inference
Solution Approach 2:
The patent replaces the mechanical/packet-based feedback system (where rate adaptation relies on packet loss detection and retransmission) with an information-based system (where CQI measurements directly guide rate selection). This substitution eliminates the delays and inaccuracies inherent in loss-based adaptation, particularly for mobile users
2Productivity
If traditional rate adaptation methods are used, then some performance adjustment is possible, but user experience degrades due to unsuccessful transmissions in mobile conditions
Solution Approach 1:
The system performs preliminary channel quality assessment before data transmission by having receiving devices measure and report CQI values in advance. This preliminary action allows transmitting devices to select optimal rates before attempting transmission, preventing unsuccessful transmissions and improving user experience by ensuring higher success rates from the outset
Data Source
AI summary
This disclosure describes systems, methods, and computer-readable media related to employing rate adaptation in full-duplex communication. A first computing device may establish with a second computing device a full-duplex communication channel having a forward data transmission direction and a reverse data transmission direction. The first computing device may transmit to the second computing device a first data portion in the forward data transmission direction of the full-duplex communication channel at a default data transmission rate. The first computing device may receive a second data portion in the reverse direction of the full-duplex communication channel containing a forward channel quality information (CQI) associated with the forward data transmission direction. The first computing device may transmit a third data portion at a first data transmission rate, wherein the first data transmission rate is based at least in part on the forward CQI contained in the second data portion.