Trigger Frame Bandwidth Indication for Efficient TB PPDU Transmission
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Solution Overview
Problem
Existing wireless LAN systems lack efficient methods for transmitting and receiving physical layer protocol data units (PPDUs) based on trigger frames, particularly for bandwidth indication in trigger-based PPDUs, which hinders improved throughput, latency reduction, and reliability.
Innovation Solution
A method and device for transmitting and receiving TB PPDUs in a wireless LAN system using trigger frames, incorporating a common info field with an uplink bandwidth subfield and special user info fields with extension subfields to indicate bandwidth, enabling efficient PPDU transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional PPDU transmission methods are used, then system compatibility is maintained, but throughput and transmission efficiency cannot be improved
Solution Approach 1:
The bandwidth indication is segmented into multiple fields: UL bandwidth subfield (2 bits) in the common info field indicates base bandwidth (20/40/80/160 MHz), while first and second UL bandwidth extension subfields (1 bit each) in the special user info field indicate extension bandwidth (80/160 MHz). This segmentation allows precise bandwidth indication without increasing overall system complexity.
Solution Approach 2:
The patent adds a new dimension to bandwidth indication by introducing extension subfields that work in conjunction with the base bandwidth subfield. This creates a two-level indication system where the combination of base bandwidth and extension bandwidth determines the final TB PPDU bandwidth, enabling 20/40/80/160 MHz without requiring a completely new indication mechanism.
2Measurement precision
If bandwidth indication for TB PPDU is not implemented, then trigger frame structure remains simple, but precise bandwidth control and resource allocation are hindered
Solution Approach 1:
The bandwidth indication is divided into manageable segments: a 2-bit UL bandwidth subfield for base bandwidth selection and 1-bit extension subfields for bandwidth extension. This segmentation provides precise bandwidth control (20/40/80/160 MHz) while keeping each individual field simple and easy to process.
Solution Approach 2:
The trigger frame pre- indicates the bandwidth configuration through the UL bandwidth subfield and extension subfields before TB PPDU transmission. This preliminary bandwidth indication allows receiving stations to prepare appropriate reception parameters in advance, enabling precise bandwidth control without adding complex real-time negotiation mechanisms.
3Productivity
If new PPDU transmission methods are introduced, then throughput and efficiency are improved, but latency may increase due to protocol overhead
Solution Approach 1:
The patent uses partial bandwidth extension indication with 1-bit extension subfields that can be selectively applied. Stations only process the extension indication when needed, avoiding unnecessary processing overhead. This partial action approach improves transmission efficiency for high-bandwidth scenarios while minimizing latency impact for lower bandwidth operations.
Solution Approach 2:
The patent changes the bandwidth parameter indication method by introducing extension subfields that modify the base bandwidth value. This parameter change approach allows flexible bandwidth adjustment (20→40→80→160 MHz) through simple bit combinations, improving transmission efficiency without requiring complex protocol negotiations that would increase latency.
Data Source
AI summary
Disclosed is a method and device for resource unit allocation in a wireless LAN system. A method performed by a station (STA) in a wireless LAN system according to an embodiment of the present disclosure may comprise the steps of: receiving a PPDU including a SIG field for resource unit allocation-related information from another STA; and acquiring a data field in the PPDU on the basis of the resource unit allocation-related information. Here, the resource unit allocation-related information may be constructed on the basis of one or more multiple-RU (MRU) candidates for a bandwidth exceeding 320 MHz.