Multi-Link Wi-Fi Backoff Coordination for Adjacent Link Interference
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Solution Overview
Problem
Devices that do not support simultaneous transmit and receive (STR) operations in communication systems with multiple links face interference issues, leading to inefficiencies in channel sensing and signal reception due to adjacent link interference.
Innovation Solution
A method involving backoff operations for multiple access categories on different links, followed by simultaneous transmission on successful links, with aligned transmission completion times using EDCA parameters and potential padding to ensure efficient multi-link communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link operations are performed on adjacent links, then transmission throughput is improved, but signal interference between links increases causing channel sensing and reception failures
Solution Approach 1:
The patent segments the multi-link operation into independent backoff operations for each link and access category. Each link performs its own backoff counter decrement independently, allowing simultaneous transmission opportunities on different links without mutual interference, thus resolving the contradiction between throughput improvement and sensing reliability
Solution Approach 2:
The patent implements preliminary backoff operations on each link before actual transmission. By pre-decrementing backoff counters for multiple access categories on different links, the system prepares transmission opportunities in advance, ensuring that when transmission occurs, the channel is already validated and interference from adjacent links is minimized
2Productivity
If simultaneous transmission on multiple links is performed, then communication efficiency is improved, but coordination complexity between links increases
Solution Approach 1:
The patent divides the transmission coordination into separate backoff management for each link and access category. Each link maintains its own backoff counter independently, simplifying the coordination complexity by treating each link as an independent entity rather than managing complex inter-link dependencies
Solution Approach 2:
The patent introduces a new dimension of access category-specific backoff counters for each link. Instead of single centralized coordination, the system uses multi-dimensional independent backoff management (link dimension × access category dimension), allowing simultaneous transmissions to be coordinated through independent counter decrements rather than complex inter-link signaling
3Adaptability or versatility
If backoff operations are performed for multiple access categories on the same link, then QoS differentiation is improved, but channel access time increases
Solution Approach 1:
The patent segments the channel access process into separate backoff operations for each access category on each link. This segmentation allows high-priority traffic to have its own independent backoff counter that can be decremented separately from lower-priority traffic, providing QoS differentiation without forcing sequential access that would increase overall channel access time
Solution Approach 2:
The patent adds the link dimension to the access category backoff management. By maintaining access category-specific backoff counters on multiple links simultaneously, the system creates a multi-dimensional backoff space where high-priority traffic can access the channel faster on any available link, reducing the time loss associated with strict sequential QoS-based access
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving data in a communication system supporting multiple links. The method of a first device comprises the steps of: performing a first backoff operation for a first AC in a first link; performing a second backoff operation for a second AC in the first link; performing a third backoff operation for a third AC in a second link; if the first backoff operation and the second backoff operation in the first link are performed successfully, selecting one AC from among the first AC and the second AC; and, if the third backoff operation is performed successfully, simultaneously performing a first transmission operation of a first frame comprising a data unit corresponding to the selected one AC in the first link and a second transmission operation of a second frame comprising a data unit corresponding to the third AC in the second link.