Full-Duplex WLAN Interference Discovery for Signal Separation
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Solution Overview
Problem
Conventional wireless communication systems are limited by duplexing methods that restrict transmissions to either downlink or uplink at a particular time, leading to challenges in separating transmitted and received signals, which hinders full-duplex data transmission capabilities.
Innovation Solution
Implementing methods and apparatus for interference discovery and management in full-duplex data transmission, including a station (STA) configured to receive and transmit full-duplex messages and interference information based on received power thresholds, enabling concurrent transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency division duplex (FDD) or time division duplex (TDD) is used to separate transmitted and received signals, then signal separation is achieved, but transmission efficiency is reduced due to inability to transmit and receive simultaneously
Solution Approach 1:
The patent segments the wireless communication system into full-duplex capable radios that can independently transmit and receive on the same frequency simultaneously. By dividing the communication into separate transmit and receive paths with isolation mechanisms, the system achieves both simultaneous operation and signal separation, resolving the contradiction between transmission efficiency and signal separation.
Solution Approach 2:
The patent introduces a new dimension of operation by enabling full-duplex communication where transmit and receive occur simultaneously on the same frequency. This moves beyond the traditional two-dimensional separation (frequency or time) to a three-dimensional approach adding the time dimension back while maintaining frequency reuse, thereby improving transmission efficiency while managing signal separation through spatial and power domain techniques.
2Productivity
If full-duplex transmission is implemented to enable simultaneous transmission and reception, then transmission efficiency is improved, but self-interference increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing interference cancellation mechanisms before the harmful self-interference degrades the received signal. The system predicts and subtracts the self-interference component from the received signal, preventing it from corrupting the desired reception. This allows full-duplex operation to proceed with maintained signal quality.
Solution Approach 2:
The patent converts the harmful self-interference into a beneficial measurement opportunity. By deliberately measuring the self-interference power and characteristics, the system gains information about the transmit signal path that can be used to improve cancellation accuracy and optimize full-duplex operation. The harmful interference becomes a source of useful channel state information.
3Reliability
If interference measurement is performed to manage self-interference, then interference management is improved, but communication overhead increases
Solution Approach 1:
The patent makes the interference measurement messages multi-functional by embedding multiple pieces of information in a single communication exchange. The full-duplex indication and interference power information are conveyed together in response messages that serve both interference measurement and channel state feedback purposes. This reduces overhead by combining multiple functions into universal message structures.
Solution Approach 2:
The system implements self-service by having stations autonomously measure and report their own interference conditions without requiring centralized coordination. Each station independently performs interference measurements, determines full-duplex capability, and reports findings to the access point. This distributed self-service approach minimizes overhead compared to centralized interference management schemes.
Data Source
AI summary
In an embodiment for interference discovery for simultaneous transmission and reception, a station (STA) receives a STR request message from an access point (AP). The STA transmits a first STR response message to the AP based on the received STR request message. The STA receives a second STR response message transmitted from a second STA to the AP. The STA determines a received power of the received second STR response message. The STA receives a first trigger message from the AP. The first trigger message indicates a STA role field. The STA transmits interference information to the AP. The interference information is based on the determined received power. The STA role field comprises an indication of at least one or more of a primary STA and a secondary STA. The STA aggregates the interference report with a data transmission to the AP in response to the first trigger message.