Multi-Link Frame Transmission Backoff for NSTR Interference
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Solution Overview
Problem
In wireless local area network (LAN) systems, devices that do not support simultaneous transmit and receive (STR) operations face challenges with interference from adjacent links, leading to inefficiencies in data transmission and reception, particularly when multi-link operations are involved, as existing methods struggle to manage channel access and signal interference effectively.
Innovation Solution
A method for transmitting and receiving frames in a device that does not support STR operations, involving the use of non-simultaneous transmit and receive (NSTR) multi-link ACK policies, block ACK requests, and backoff operations to ensure efficient data transmission across multiple links, even when adjacent links experience interference, by setting ACK policy fields and performing backoff operations to synchronize data reception and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link operations are performed on adjacent links, then throughput is improved, but signal interference increases causing channel sensing and signal reception to fail
Solution Approach 1:
The patent segments the communication system into multiple independent links (first link and second link) with different TXOP configurations. By dividing the multi-link operation into separate controllable segments, the system can manage interference on each link individually while maintaining overall throughput through coordinated operation across links.
Solution Approach 2:
The patent applies preliminary action by having the first device perform a backoff operation in advance before transmitting the reception response frame. This preemptive delay ensures that the response frame is transmitted only after the second device completes its transmission on the second link, preventing interference before it occurs.
2Loss of time
If reception response frame is transmitted immediately after receiving first frame, then response time is reduced, but interference from ongoing transmission on second link occurs
Solution Approach 1:
The first device performs a backoff operation in advance before transmitting the reception response frame. This preliminary delay action ensures that the response is sent only after the second device completes its transmission, preventing interference while minimizing the actual waiting time for the response.
Solution Approach 2:
The system uses feedback mechanisms where the first device monitors the transmission status of the second device on the second link. Based on this feedback about ongoing transmissions, the first device adjusts its response transmission timing dynamically, sending the reception response only when interference-free conditions are detected.
3Productivity
If different TXOP lengths are used on different links, then data transmission efficiency is improved, but synchronization of reception and transmission becomes complex
Solution Approach 1:
The patent applies local quality by configuring different TXOP lengths specifically for the first link and second link based on their individual requirements. The first TXOP is set shorter than the second TXOP to match the respective data transmission needs of each link, optimizing efficiency locally on each link while the coordination mechanism handles the overall synchronization.
Data Source
AI summary
In a method and device for transmitting and receiving a frame in consideration of the length of data in a communication system supporting multiple links, the method of a first device includes the steps of: receiving a first frame from a second device in a first TXOP on a first link; receiving a second frame from the second device in a second TXOP on a second link; performing a first backoff operation for transmitting a first reception response frame for the first frame on the first link; and “when the first backoff operation is completed and the reception of the second frame is completed”, transmitting the first reception response frame to the second device on the first link.