Aggregated WLAN PPDU Decoding for Preamble-Free Latency-Sensitive Traffic
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Solution Overview
Problem
Existing wireless LAN systems face challenges in performing aggregated-PPDU transmission and reception, particularly in decoding PDUs without preambles, and efficiently handling delay-sensitive traffic.
Innovation Solution
A method and device for transmitting and receiving aggregated physical layer protocol data units (A-PPDUs) that include latency-sensitive traffic without preambles, utilizing STA ID information for decoding based on specific preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a PPDU without preamble is transmitted to reduce overhead and latency, then transmission efficiency is improved, but the receiver cannot decode the PPDU without preamble information
Solution Approach 1:
The receiver performs preliminary actions by storing received PPDUs with preambles in a buffer before the actual transmission occurs. When a PPDU without preamble needs to be decoded, the receiver retrieves the necessary preamble information from the stored buffer, enabling successful decoding without requiring the transmitted PPDU to include the preamble.
2Productivity
If aggregated-PPDU transmission is implemented to increase bandwidth and throughput, then transmission rate is improved, but the complexity of transmitting and receiving multiple PPDUs increases
Solution Approach 1:
The aggregated-PPDU transmission is segmented into individual PPDU components, each with its own preamble stored separately in the buffer. This segmentation allows the receiver to process each PPDU independently when needed, simplifying the overall complexity of handling multiple aggregated PPDUs while maintaining high throughput capability.
3Loss of time
If delay-sensitive traffic is transmitted without waiting for complete PPDU formation, then latency is reduced, but the reliability of data transmission may be compromised
Solution Approach 1:
The system performs preliminary actions by pre-storing complete PPDUs with preambles in the buffer before delay-sensitive traffic transmission is needed. When delay-sensitive traffic requires immediate transmission, the receiver can quickly retrieve the necessary preamble information from the buffer, enabling low-latency transmission while maintaining reliability through pre-prepared data.
Data Source
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AI summary
A method and a device operating in a wireless LAN system are disclosed. The method performed by means of a first STA in a wireless LAN system, according to one embodiment of the present disclosure, comprises the steps of: receiving, from a second STA, a specific preamble of a first physical layer protocol data u11it (PPDU) corresponding to a first frequency band from among aggregated-PPDUs (A-PPDUs); and decoding, on the basis of the specific preamble, a second PPDU including latency sensitive traffic received from the second STA in the first frequency band, wherein the second PPDU does not include a preamble or a header but can include STA identity (ID) information associated with the first STA.