Multi-Link Notice-to-Send Signaling for STR Avoidance
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Solution Overview
Problem
Existing multi-link devices (MLDs) with non-synchronous transmit receive (STR) capabilities face inefficiencies in avoiding coexistence interference during data transmission, as current mechanisms like RTS and CTS occupy excessive communication resources and fail to effectively prevent STR.
Innovation Solution
Implementing a notice-to-send message system that allows STAs to instruct data transmission or halt it based on the reception of data units or messages within a preset inter-frame space, ensuring coordinated data exchange between non-STR MLDs to avoid STR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RTS or CTS mechanism is used to avoid STR in non-STR MLD, then coexistence interference is avoided, but communication resources are excessively occupied and communication efficiency is reduced
Solution Approach 1:
The patent applies preliminary action by having the first STA send a notice-to-send message in advance to indicate its intention to transmit data in an upcoming TXOP. This allows the second MLD to proactively configure its STAs to avoid simultaneous transmission, preventing STR before it occurs rather than using reactive RTS/CTS mechanisms that consume additional communication resources.
2Reliability
If notice-to-send message mechanism is implemented, then STR is effectively avoided in non-STR MLD, but device complexity increases
Solution Approach 1:
The notice-to-send message mechanism serves multiple functions: it indicates data transmission intention, provides timing information about upcoming TXOPs, and enables coordinated avoidance of STR across multiple links. This multi-functionality reduces the need for separate dedicated signaling mechanisms, thereby limiting the increase in device complexity while maintaining effective STR avoidance.
Data Source
AI summary
Provided are a data sending method and device and a data receiving method and device. The data sending method includes: sending a notice-to-send message to a second station (STA), where the notice-to-send message is configured to instruct a first STA to prepare to send a data unit to the second STA in a first transmission opportunity (TXOP) obtained in advance, and the second STA belongs to a second multi-link device (MLD); and performing the following operations based on the situation of the third STA receiving a data unit or the notice-to-send message in a duration of a preset inter-frame space: sending a data unit to the second STA in the first TXOP, or stopping sending a data unit to the second STA, where the third STA belongs to a first MLD.