A-PPDU Header Signaling for Latency-Sensitive WLAN Traffic
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Solution Overview
Problem
The challenge in wireless LAN systems is to efficiently perform aggregated physical layer protocol data unit (A-PPDU) transmission and reception, particularly in handling latency-sensitive data and indicating channel information for downlink A-PPDU headers.
Innovation Solution
A method and device for transmitting and receiving A-PPDUs that include headers with information on frequency resource units and timing for latency-sensitive data transmission, allowing for efficient channel allocation and interception of data during ongoing transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If A-PPDU transmission is performed without dedicated header information for latency-sensitive data, then the transmission structure remains simple, but latency-sensitive data cannot be efficiently handled
Solution Approach 1:
The A-PPDU header is segmented into distinct functional parts: a common header portion for general transmission information and a latency-sensitive data header portion for specific latency-sensitive data parameters. This segmentation allows the system to handle latency-sensitive data efficiently while keeping the overall structure organized and manageable.
Solution Approach 2:
The header information for latency-sensitive data is prepared and included in advance within the A-PPDU header structure before transmission begins. This preliminary action enables receiving stations to immediately identify and process latency-sensitive data without waiting for additional signaling, thereby reducing latency while maintaining structured organization.
2Productivity
If channel information is not indicated in the A-PPDU header, then the header format remains simple, but efficient channel allocation for downlink data is not achieved
Solution Approach 1:
The A-PPDU header is designed with multi-functionality to serve both common transmission purposes and specific channel allocation requirements. By incorporating universal header structures that can carry both general A-PPDU information and channel-specific downlink data information, the system achieves efficient channel allocation without requiring separate signaling mechanisms.
Solution Approach 2:
Channel allocation information is preliminarily embedded in the A-PPDU header before transmission, enabling receiving stations to immediately identify the allocated channels for downlink data. This preliminary inclusion of channel information eliminates the need for separate channel assignment signaling, thereby improving channel allocation efficiency while maintaining a unified header structure.
3Loss of time
If latency-sensitive data transmission is integrated without specific timing information, then the transmission process remains simple, but real-time data handling cannot be achieved
Solution Approach 1:
The header information is segmented to include dedicated timing parameters for latency-sensitive data transmission. This segmentation separates timing-related information from general transmission parameters, allowing the system to implement precise real-time data handling while keeping the overall header structure organized and manageable.
Solution Approach 2:
Timing information for latency-sensitive data is preliminarily specified in the A-PPDU header before transmission begins. This preliminary inclusion of timing parameters enables receiving stations to synchronize and process latency-sensitive data in real-time without requiring additional timing negotiation or signaling during transmission, thereby reducing latency while maintaining structured organization.
Data Source
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AI summary
Disclosed are a method and device for operation in a wireless LAN system. The method performed by a first STA in a wireless LAN system according to an embodiment disclosed herein may comprise the steps of: receiving an aggregated physical layer protocol data unit (A-PPDU) header from a second STA; and receiving an A-PPDU from the second STA on the basis of the A-PPDU header, wherein the A-PPDU header includes first information related to at least one frequency resource unit for latency sensitive (LS) data transmission and second information related to the timing for the LS data transmission.