WLAN Full-Duplex Interference Discovery for STR Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless communication systems are limited by duplexing methods that restrict transmissions to either downlink or uplink, preventing simultaneous transmission and reception due to isolation limitations, which hinders full-duplex data transmission capabilities.
Innovation Solution
Implementing methods and apparatus for interference discovery and management in full-duplex data transmission, including stations configured to transmit and receive full-duplex request and response messages, determine received power, and adjust transmission configurations based on interference levels to enable simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio uses conventional duplexing methods (FDD or TDD) to separate downlink and uplink transmissions, then isolation between transmitted and received signals is maintained, but simultaneous transmission and reception cannot be achieved
Solution Approach 1:
The system performs preliminary interference discovery by having STAs transmit full-duplex response messages and measure received power before actual data transmission. This advance detection of potential self-interference allows the system to identify full-duplex opportunities proactively, enabling simultaneous transmission and reception while managing interference through preliminary measurement and reporting mechanisms
Solution Approach 2:
The system changes the operational parameters by allowing radios to transmit and receive on the same frequency simultaneously, transitioning from conventional separate frequency/time allocation to in-band full-duplex operation. This parameter change enables doubled data capacity while using interference discovery messages and received power measurement to manage the trade-off between improved productivity and maintained signal isolation
2Productivity
If a radio transmits and receives on the same frequency simultaneously (full-duplex), then data transmission capacity is doubled, but self-interference between transmitted and received signals increases
Solution Approach 1:
The system implements feedback mechanisms where STAs measure the received power of full-duplex response messages and report interference information back to the network. This feedback loop enables dynamic adjustment of full-duplex operations based on actual interference conditions, allowing the system to maintain high data capacity while managing self-interference through continuous monitoring and reporting
Solution Approach 2:
The patent introduces intermediary full-duplex discovery messages and trigger messages that mediate between the desire for high data capacity and the need to manage self-interference. These intermediary communications allow STAs to probe for full-duplex opportunities and report interference conditions without committing to actual data transmission, serving as a buffer that enables safe full-duplex operation
3Productivity
If interference discovery messages are exchanged to identify full-duplex opportunities, then simultaneous transmission and reception can be enabled, but communication protocol complexity increases
Solution Approach 1:
The system uses universal message types (full-duplex request messages, response messages, and trigger messages) that can be applied across different full-duplex scenarios and network configurations. These multi-functional messages handle multiple purposes including interference discovery, capability indication, and transmission coordination, reducing overall protocol complexity through consolidation of functions into standardized message formats
Data Source
AI summary
An access point (AP) is configured to: transmit a first simultaneous transmission and reception (STR) request message to a first station (STA), transmit a second STR request message to a second STA, receive a first STR response message from the first STA based on the transmitted first STR request message, and to receive a second STR response message from the second STA based on the transmitted second STR request message. The second STR response message from the second STA is received after the first STR response message is received from the first STA. The second STR response message comprises an indication that STR transmission is allowed. The AP is configured to transmit a first trigger message, based on the indication that the STR transmission is allowed. The first trigger message indicates a STA role field. The AP is configured to receive interference information from the first STA.