WLAN Trigger Frame Configuration for DL A-PPDU
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Solution Overview
Problem
The existing WLAN systems face challenges in efficiently configuring trigger frames for Downlink Aggregated-Physical Protocol Data Units (DL A-PPDUs) in next-generation wireless local area networks, particularly in supporting enhanced throughput and backward compatibility with older standards.
Innovation Solution
A method and apparatus for configuring a trigger frame that includes control information for a DL A-PPDU, specifically designed for the IEEE 802.11be standard, which allows simultaneous transmission of High Efficiency (HE) and Extreme High Throughput (EHT) PPDUs, using a trigger frame structure with common and variant user information fields to effectively assign channels and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a trigger frame is configured to support simultaneous transmission of HE and EHT PPDUs, then the adaptability and versatility of the WLAN system is improved, but the device complexity increases due to the need for new trigger frame structures and signaling techniques
Solution Approach 1:
The trigger frame is segmented into distinct fields: a common information field containing DL BW and DL BW Extension subfields, and separate HE variant and EHT variant user information fields. This segmentation allows each field to serve specific purposes while maintaining overall frame structure efficiency.
Solution Approach 2:
The trigger frame structure is designed with multi-functionality to support both HE and EHT PPDUs simultaneously. The common information field serves both HE and EHT variants, while the variant-specific fields provide targeted control information, enabling a single frame structure to handle multiple protocol requirements.
2Measurement precision
If the trigger frame includes detailed control information for DL A-PPDU, then the measurement precision and control accuracy are improved, but the loss of information increases due to the larger frame size requiring more bandwidth
Solution Approach 1:
Specific control information elements are extracted and placed in dedicated subfields within the trigger frame structure. The DL BW and DL BW Extension subfields extract bandwidth control information, while the HE and EHT variant user information fields extract protocol-specific parameters, allowing precise control without redundant information.
Solution Approach 2:
The trigger frame includes only the necessary control information fields required for DL A-PPDU transmission, avoiding excessive information inclusion. The common information field contains essential bandwidth parameters, while variant fields contain only protocol-specific necessities, preventing information overload.
3Ease of operation
If backward compatibility with 802.11ax is maintained, then the ease of operation is improved, but the productivity decreases due to limitations in supporting increased spatial streams and throughput
Solution Approach 1:
The trigger frame structure employs dynamic field configurations where the common information field and variant-specific fields can be selectively populated based on the transmission requirements. This dynamic approach allows the system to operate in backward-compatible mode when needed while enabling enhanced throughput modes when capabilities are available.
Solution Approach 2:
The system utilizes parameter changes in the trigger frame fields to transition between compatibility modes and enhanced performance modes. By modifying the content and activation of DL BW, DL BW Extension, and variant user information fields, the system adapts its operational characteristics to balance compatibility and productivity requirements.
Data Source
AI summary
The present disclosure proposes a method and a device for configuring a trigger frame including control information for DL A-PPDU in a WLAN system. Specifically, a receiving STA receives a trigger frame from a transmitting STA. The receiving STA receives, from the transmitting STA, a triggered DL A-PPDU on the basis of the trigger frame. The trigger frame includes a common information field, an HE modified user information field, and an EHT modified user information field. The common information field includes a trigger type subfield, a DL BW subfield, a DL BW Extension subfield, and a first reserved subfield. The HE modified user information field includes a first AID12 subfield, a first RU allocation subfield, and a second reserved subfield. The EHT modified user information field includes a second AID12 subfield, a second RU allocation subfield, and a PS160 subfield.