Multi-User Full Duplex Link Adaptation via Channel Quality Feedback
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Solution Overview
Problem
In full duplex communication systems, especially in multi-user scenarios, the simultaneous transmission and reception lead to signal interference, which complicates spectrum efficiency and requires careful control of transmission and reception signals to avoid excessive interference and maintain signal quality.
Innovation Solution
The method involves establishing a full duplex mode between wireless devices, where channel quality indicators are used to evaluate and adjust parameters such as modulation and coding schemes and transmission power, based on signal interference noise ratio and channel quality measurements in both full duplex and half-duplex conditions, to minimize interference and optimize link adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex mode is used to double spectrum efficiency, then productivity is improved, but object-affected harmful factors worsen due to self-interference between transmitted and received signals
Solution Approach 1:
The patent applies self-interference cancellation techniques where the transmitted signal is subtracted from the received signal to remove the harmful interference. This converts the harmful self-interference into a manageable parameter that can be compensated for, enabling full duplex operation to achieve doubled spectrum efficiency while maintaining signal quality
Solution Approach 2:
The patent dynamically adjusts transmission power levels and modulation and coding schemes based on channel quality indicators. By changing these parameters adaptively, the system optimizes the balance between achieving high spectrum efficiency through full duplex mode and maintaining acceptable signal quality despite self-interference
2Reliability
If transmission power is increased to improve signal quality, then reliability is improved, but object-generated harmful factors worsen due to increased interference to other links
Solution Approach 1:
The patent implements dynamic transmission power control where the serving point adjusts the transmission power of wireless devices based on channel quality indicators and interference conditions. This ensures that transmission power is increased only when necessary to maintain signal quality, while minimizing interference to other communication links through adaptive parameter adjustment
Solution Approach 2:
The patent uses channel quality indicators fed back from receiving devices to the serving point to dynamically adjust transmission parameters. This feedback mechanism allows the system to respond to changing channel conditions and interference levels, optimizing the balance between signal quality and interference generation in real-time
3Productivity
If link adaptation is performed to optimize communication parameters, then productivity is improved, but device complexity worsens due to multiple measurements and parameter adjustments
Solution Approach 1:
The patent separates the link adaptation process into distinct phases: measuring channel quality indicators during full duplex and half-duplex periods, evaluating the difference between these measurements, and then adjusting parameters based on the evaluation. This segmentation of the adaptation process makes the complex task more manageable and systematic
4Productivity
If full duplex mode is established between multiple users, then productivity is improved, but object-affected harmful factors worsen due to multiple interfering transmissions
Solution Approach 1:
The patent extends link adaptation to multi-user full duplex scenarios by dynamically adjusting transmission power and modulation and coding schemes for each user based on channel quality indicators. This parameter optimization reduces the impact of multiple interfering transmissions while maintaining high spectrum efficiency across all user links
Data Source
AI summary
A method of link adaptation is described including establishing, using a first serving point, a multi-user full duplex mode wherein the multi-user full duplex mode enables a downlink to a first wireless device and an uplink from a second wireless device. The first serving point requests from the first wireless device a first channel quality indicator indicating channel quality between the serving point and the first wireless device in a full duplex time period and a second channel quality indicator indicating channel quality between the serving point and the first wireless device in non-full duplex time period. The full duplex mode is evaluated using the first and second channel quality indicators. At least one parameter of the full duplex mode is adjusted based on the evaluating.