Uplink PPDU Bandwidth Indication for HE-EHT Trigger Compatibility
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Solution Overview
Problem
The IEEE 802.11ax standard's trigger frame is limited to a maximum bandwidth of 160 MHz, which does not support the higher bandwidth requirements of the IEEE 802.11be standard, necessitating a method to enable EHT stations to transmit on bandwidths greater than 160 MHz while maintaining compatibility with HE stations.
Innovation Solution
Reusing the trigger frame in the 802.11ax standard to include additional indication information for both HE and EHT stations, allowing EHT stations to transmit on bandwidths greater than 160 MHz without affecting HE stations, thereby reducing complexity and signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the trigger frame is designed according to the 802.11ax standard with a maximum bandwidth of 160 MHz, then compatibility with HE stations is ensured, but the bandwidth requirement for EHT stations (greater than 160 MHz) cannot be met
Solution Approach 1:
The trigger frame is designed to serve multiple functions: it can trigger both HE stations (802.11ax) and EHT stations (802.11be) simultaneously. By incorporating both a 2-bit uplink bandwidth field (for HE stations) and a 4-bit first indication information field (for EHT stations), the same trigger frame structure achieves universal compatibility across different wireless standards and bandwidth requirements.
Solution Approach 2:
The solution extends the bandwidth indication capability by adding another dimension of information representation. Instead of replacing the existing 2-bit field, a new 4-bit first indication information field is added, creating a layered indication structure where different bit fields serve different station types and bandwidth ranges, thereby expanding the overall bandwidth indication capacity without losing backward compatibility.
2Adaptability or versatility
If a new trigger frame is designed to support bandwidth greater than 160 MHz for EHT stations, then the bandwidth requirement is met, but the complexity and signaling overheads increase
Solution Approach 1:
The trigger frame employs dynamic interpretation of its fields based on the station type. HE stations interpret the 2-bit uplink bandwidth field, while EHT stations interpret the 4-bit first indication information field. This dynamic field interpretation allows the same trigger frame structure to adapt to different bandwidth requirements without requiring separate frame designs for different station types.
Solution Approach 2:
The bandwidth indication functionality is segmented into multiple independent fields: a 2-bit uplink bandwidth field for HE stations and a 4-bit first indication information field for EHT stations. This segmentation allows each field to be optimized for its specific purpose while maintaining overall frame compatibility, reducing the need for a completely new frame structure.
3Adaptability or versatility
If the trigger frame is designed to support both HE and EHT stations simultaneously, then adaptability is improved, but the signaling overhead increases
Solution Approach 1:
The trigger frame merges the bandwidth indication mechanisms for both HE and EHT stations into a single unified structure. By combining the 2-bit uplink bandwidth field and the 4-bit first indication information field within the same trigger frame, the solution eliminates the need for separate trigger frames for different station types, thereby reducing overall signaling overhead while maintaining multi-station compatibility.
Data Source
AI summary
A method and related apparatus for physical layer protocol data unit (PPDU) uplink bandwidth indication are provided. The method relates to the wireless communications field, for example, is applicable to a wireless local area network supporting the 802.11be standard. The method includes: An AP generates and sends a trigger frame. The trigger frame carries first indication information, where the first indication information is directly used to indicate or jointly indicate an EHT TB PPDU bandwidth or an uplink PPDU total transmission bandwidth. The trigger frame carries second indication information, where the second indication information is used to indicate distribution of an HE TB PPDU and/or an EHT TB PPDU in the uplink PPDU total transmission bandwidth, or directly indicate whether an EHT station transmits an HE TB PPDU or an EHT TB PPDU.