Echo Cancellation Metric for Full Duplex Scheduling
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face limitations in supporting full duplex communication due to inadequate echo cancellation, which affects the ability to simultaneously transmit and receive signals, leading to suboptimal performance and capacity issues.
Innovation Solution
The method involves determining a detailed echo cancellation metric based on the transmit power of wireless devices and reporting it to a scheduling entity to dynamically schedule full duplex or half duplex communication resources, allowing for dynamic FD/HD mode selection based on echo cancellation capabilities and path loss estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented without adequate echo cancellation, then simultaneous transmit and receive capability is achieved, but signal interference and reception quality deteriorate
Solution Approach 1:
The patent converts the harmful self-interference signal into a useful measurement tool by using the transmitted signal as a reference to calculate echo cancellation metrics. The strong transmit signal that causes interference is simultaneously used to estimate and cancel the echo, transforming the harmful factor into a beneficial reference for improving reception quality while maintaining full duplex operation
Solution Approach 2:
The patent implements feedback by calculating echo cancellation metrics based on transmit power and using these metrics to dynamically adjust resource allocation and duplex mode selection. The system continuously monitors the relationship between transmit power and echo cancellation effectiveness, feeding this information back to the scheduler to optimize communication resources and maintain signal quality
2Productivity
If dynamic resource allocation based on echo cancellation metrics is implemented, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the complex scheduling decision into two independent parts: (1) calculating echo cancellation metrics based on transmit power, and (2) using these metrics for resource allocation. This segmentation allows the system to handle complexity in manageable stages, where the metric calculation is a standardized function that can be applied uniformly across different users and scenarios
Solution Approach 2:
The patent uses parameter changes by establishing a functional relationship between transmit power and echo cancellation metrics. Instead of complex real-time analysis, the system determines metrics as a function of transmit power, allowing the scheduler to efficiently allocate resources by evaluating this parameter relationship rather than performing complex simulations for each scheduling decision
Data Source
AI summary
Apparatus and methods for wireless communications include determining a first echo cancellation metric indicative of a first amount of echo cancellation as a first function of a first transmit power of a first wireless communications device; and providing the first echo cancellation metric to a scheduling entity for scheduling full duplex (FD) or half duplex (HD) communication resources for the first wireless communications device.