Multi-Link Device Backoff Coordination for NSTR Deadlock Prevention
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Solution Overview
Problem
In multi-link wireless operations, existing technologies face challenges in defining backoff operations for simultaneous transmissions across multiple links when multiple backoff counters on a link become zero, leading to inefficiencies and potential deadlocks.
Innovation Solution
A device and method for multi-link operations that perform non-simultaneous transmission and reception (NSTR) capabilities, where a processor executes first and second backoff operations on different links, transmitting Physical Layer Convergence Protocol (PLCP) Protocol Data Units (PPDUs) with start times differing by no more than a Receive-Transmit Turnaround Time (aRxTxTurnaroundTime) or 4 microseconds, and includes mechanisms to handle backoff counters and Quality of Service (QoS) adjustments to avoid deadlocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple backoff operations are performed simultaneously on multiple links, then transmission efficiency is improved, but deadlock situations may occur
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined transmission order before simultaneous transmissions occur. The first link is designated to transmit before the second link, creating a pre-established sequence that prevents deadlock situations while enabling efficient simultaneous operations across multiple links.
2Adaptability or versatility
If backoff counters are managed independently on each link, then operational flexibility is improved, but coordination complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the backoff management into independent link-level operations while maintaining overall coordination through the predetermined transmission order. Each link manages its own backoff counter independently, but the system-wide transmission sequence provides the coordination mechanism, reducing overall complexity.
3Reliability
If transmissions start at different times on multiple links, then collision avoidance is improved, but timing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing the transmission sequence where the first link transmits before the second link. This predetermined ordering provides sufficient time separation to avoid collisions while using manageable timing offsets that do not require excessive precision, balancing reliability with feasible timing requirements.
Data Source
AI summary
Embodiments of a device and a method for multi-link operations are disclosed. In an embodiment, a device includes a processor configured to perform a first backoff operation on a first link and a second backoff operation on a second link of a multi-link device (MLD) that has a non-simultaneous transmission and reception capability (NSTR MLD), and transmit a first Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU) on the first link at a first start time after the first backoff operation and a second PPDU on the second link at a second start time after the second backoff operation.