Uplink MU Trigger Framing for Low-Latency WLAN Traffic
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Solution Overview
Problem
Existing wireless LAN systems face challenges in efficiently performing uplink multi-user transmission for low-latency traffic, particularly in next-generation networks like IEEE 802.11be, requiring improved methods to support low-latency and ultra-high reliability.
Innovation Solution
A method and device for performing uplink multi-user transmission in wireless LAN systems, involving the exchange of frames with specific low-latency identifiers to trigger and manage low-latency traffic, utilizing trigger frames to coordinate transmissions between stations and access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If trigger frames are used to coordinate uplink multi-user transmission, then transmission efficiency and latency are improved, but system complexity and coordination overhead increase
Solution Approach 1:
The trigger frame serves as an intermediary mechanism that coordinates uplink transmissions from multiple STAs. The AP sends trigger frames containing LL ID information to specific STAs, which then transmit their low-latency traffic in a coordinated manner. This intermediary coordination reduces latency by preventing random access collisions while managing system complexity through structured frame-based control.
Solution Approach 2:
The system performs preliminary actions by pre-configuring LL ID mappings and pre-scheduling trigger frames before actual data transmission. The AP prepares trigger frames with specific LL ID information in advance, and STAs prepare their low-latency traffic for transmission based on received trigger frames, reducing actual transmission latency through advance preparation.
2Adaptability or versatility
If multiple LL IDs are supported for different traffic types, then traffic differentiation and QoS are improved, but frame structure complexity and processing overhead increase
Solution Approach 1:
The system segments traffic into different low-latency categories using multiple LL IDs (LL ID 0 and LL ID 1). Each LL ID represents a distinct traffic type or priority level, allowing the AP to differentiate and handle various low-latency traffic types separately. This segmentation enables fine-grained QoS control while keeping the framing structure manageable through standardized LL ID fields.
Solution Approach 2:
Different LL IDs are assigned to different traffic types with specific quality requirements. The system applies local quality control by treating traffic associated with LL ID 0 differently from LL ID 1, allowing customized handling, prioritization, and resource allocation for each traffic type based on its specific latency requirements.
Data Source
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AI summary
Disclosed are an operating method and device in a wireless LAN system. A method performed by a first station (STA) in a wireless LAN system, according to one embodiment of the present disclosure, may comprise the steps of: receiving, from an access point (AP), a first frame including first information related to at least one low latency (LL) identifier (ID) and second information related to a traffic identifier (TID); receiving, from the AP, a trigger frame including third information related to at least one specific LL ID from among the at least one LL ID; and transmitting, to the AP, a second frame including traffic associated with the at least one specific LL ID, on the basis of the trigger frame.