Stream Classification Service for Low Latency Traffic Separation
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Solution Overview
Problem
Existing Multi-Link (ML) communication systems face challenges in efficiently managing low latency traffic streams, particularly in separating low latency data from normal data within the same traffic class, and in managing sequence numbering for block acknowledgment.
Innovation Solution
The proposed solution involves using an improved Stream Classification Service (SCS) mechanism that allows a non-AP Multi-Link Device (MLD) to reserve a local Traffic Identifier (TID) queue associated with low latency streams. This is achieved by identifying a local traffic stream using SCS, mapping it onto a target TID, and mapping the impacted user priority onto a fallback TID, ensuring the target TID is fully reserved for the local SCS stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated behaviors are implemented to separate low latency data from normal data in the same traffic class, then low latency stream delivery is improved, but device complexity increases
Solution Approach 1:
The patent segments the TID queue into two separate queues: a first queue for normal data and a second queue for low latency data. This segmentation allows low latency data to be transmitted separately from normal data, ensuring timely delivery without requiring complex discrimination mechanisms in low-end devices. The segmentation is implemented through the SCS mechanism which identifies and separates traffic streams based on latency requirements.
Solution Approach 2:
The patent introduces an intermediary mapping mechanism where the impacted user priority is mapped onto a fallback TID. This intermediary mapping allows the system to handle the separation of low latency and normal data without requiring direct complex behaviors at the non-AP station. The fallback TID acts as an intermediary that simplifies the transmission process for low-end devices while still enabling proper stream separation at the AP MLD.
2Reliability
If triggered UL MU operations or service periods are dedicated to SCS low latency traffic stream, then low latency delivery is improved, but sequence numbering management becomes complex
Solution Approach 1:
The patent segments the sequence numbering management by creating separate TID queues for different traffic types. Normal data and low latency data are assigned to different queues (first queue and second queue respectively), which simplifies sequence numbering management. Each queue can be independently managed without requiring complex coordination, as the segmentation naturally separates the sequence numbering requirements.
Solution Approach 2:
The patent uses a fallback TID that copies or mirrors the structure of the target TID but is used specifically for normal data transmission. This copying approach allows the system to maintain simple sequence numbering for normal data while dedicating the target TID to low latency data, avoiding the complexity of managing sequence numbers for mixed traffic types in the same queue.
3Measurement precision
If low-end stations are adapted with additional processes for stream separation, then stream classification precision is improved, but ease of manufacture decreases
Solution Approach 1:
The patent implements a self-service approach where the AP MLD performs the stream classification and separation functions centrally. The non-AP MLD simply transmits data to the target TID, and the AP MLD automatically routes normal data to the fallback TID and low latency data to the target TID based on the SCS mechanism. This self-service approach at the AP side eliminates the need for complex classification processes in low-end non-AP stations, maintaining ease of manufacture while achieving precise stream separation.
Solution Approach 2:
The fallback TID serves as an intermediary that simplifies the transmission process for non-AP stations. Instead of requiring non-AP stations to implement complex stream classification logic, the fallback TID provides a simple mechanism where all data can be transmitted to the target TID, and the AP MLD handles the separation. This intermediary approach maintains stream classification precision at the AP side while keeping non-AP station implementation simple and easy to manufacture.
Data Source
AI summary
To easy the triggering by an AP MLD of uplink communications of low latency streams from non-AP MLD, the invention proposes that a local traffic stream be identified using a Stream Classification Service, SCS. The local SCS traffic stream is mapped onto a target TID which was previously mapped with an impacted UP. The local SCS stream is preferably assigned to an alternate queue of an AC. Said impacted UP is also mapped onto a fallback TID, corresponding to the primary queue of the same AC. The SCS stream is advertised to the AP using a SCS Request frame. Conventional fields can be used. A trigger frame from an affiliated AP of the AP MLD may then provide resource units to an affiliated non-AP station dedicated to the target TID, hence specific to the low latency SCS stream.