Trigger Frame Bandwidth Signaling for Wideband Uplink PPDU
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Solution Overview
Problem
Existing wireless LAN systems lack a method to efficiently indicate and transmit/receive a physical layer protocol data unit (PPDU) in a wide bandwidth, particularly for uplink transmissions, which hinders improved throughput and reliability.
Innovation Solution
A method and device for indicating a wide bandwidth through a trigger frame, utilizing a special user information field with UL bandwidth extension subfields to set specific bandwidths, such as 480 MHz or 560 MHz, for transmitting/receiving PPDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing wireless LAN systems use standard bandwidth allocation methods, then system compatibility is maintained, but wide bandwidth transmission capability is insufficient
Solution Approach 1:
The patent embeds bandwidth extension information within the existing trigger frame structure by utilizing the special user information field. The UL bandwidth extension subfield is nested inside the special user information field, which itself is part of the trigger frame. This nested structure allows wide bandwidth indication without adding separate external signaling mechanisms, thus improving adaptability while controlling complexity.
Solution Approach 2:
The trigger frame's special user information field is designed to serve multiple functions: it carries both UL bandwidth extension subfields for wide bandwidth indication and other control information for uplink transmission. This multi-functional design allows the same structure to handle both standard and extended bandwidth scenarios, enhancing versatility without requiring separate dedicated structures.
2Productivity
If wide bandwidth is implemented without extended bandwidth indication, then system simplicity is maintained, but throughput improvement is limited
Solution Approach 1:
The patent performs preliminary action by indicating the extended bandwidth information in advance through the trigger frame before the actual uplink transmission occurs. The UL bandwidth extension subfields are set in the trigger frame to pre-define the bandwidth configuration, allowing receiving stations to prepare for wide bandwidth transmission and ensuring no bandwidth information is lost during the transmission process.
3Adaptability or versatility
If standard trigger frame structure is used, then backward compatibility is maintained, but extended bandwidth indication capability is insufficient
Solution Approach 1:
The patent applies local quality by making specific parts of the trigger frame (the special user information field and UL bandwidth extension subfields) capable of carrying extended bandwidth information, while the rest of the trigger frame structure remains unchanged for backward compatibility. This localized enhancement allows advanced functionality without requiring complete structural redesign.
Data Source
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AI summary
An operating method and device in a wireless LAN system are disclosed. A method pelformed by means of a first station (STA) in a wireless LAN system, according to one embodiment of the present disclosure, comprises the steps of: receiving, from a second STA, a trigger frame including a special user information field; and transmitting a TB PPDU to the second STA within a specific bandwidth on the basis of the trigger frame, wherein the special user information field includes a UL bandwidth extended subfield and a specific subfield related to the extended bandwidth, and the specific bandwidth can be indicated as 480 MHZ or 560 MHZ according to the specific subfield on the basis of an UL bandwidth subfield value included in the trigger frame being set to 3 and the UL bandwidth extended subfield value being set to 2 or 3.