Trigger Frame Segmentation for Multi-Protocol PPDU Transmission
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Solution Overview
Problem
The increased number of spatial streams in next-generation wireless LAN systems requires improved signaling techniques to efficiently transmit and decode Physical Layer Protocol Data Units (PPDUs) supporting different versions or protocols.
Innovation Solution
A method for defining a trigger frame that aggregates PPDUs with different versions or protocols, including a common information field and special user information fields, to prevent unnecessary decoding by the receiving station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple user information fields for different PPDU versions are included in the trigger frame, then the receiving station can receive PPDUs supporting different versions, but the receiving station must decode all user information fields to find its own, increasing decoding time and processing complexity
Solution Approach 1:
The user information list is segmented into multiple fields, each corresponding to a specific PPDU version. The trigger frame includes a first user information list field for EHT PPDUs and a second user information list field for UHR PPDUs. This segmentation allows receiving stations to quickly identify which field contains their information based on the PPDU version they support, avoiding the need to decode the entire user information list.
Solution Approach 2:
Different portions of the trigger frame are optimized for different PPDU versions. The first user information list field is specifically formatted for EHT PPDUs while the second is formatted for UHR PPDUs. This local optimization allows each receiving station to efficiently decode only the relevant field without processing unrelated fields, reducing overall decoding time.
2Adaptability or versatility
If the trigger frame includes multiple user information list fields for different PPDU versions, then backward compatibility is maintained, but the frame structure becomes more complex
Solution Approach 1:
The trigger frame structure is segmented into distinct fields: a first user information list field for EHT PPDUs and a second user information list field for UHR PPDUs. Each field has a specific format and purpose, making the overall structure more manageable and easier to implement while maintaining compatibility with both EHT and UHR systems.
Solution Approach 2:
The trigger frame serves multiple functions by including fields for different PPDU versions. The same trigger frame structure can support both EHT and UHR PPDUs, making the system universally compatible with multiple standards without requiring separate trigger frames for each version.
3Reliability
If receiving stations decode all user information fields to ensure they don't miss their allocation, then no information is lost, but processing efficiency decreases
Solution Approach 1:
The user information fields are segmented by PPDU version, allowing receiving stations to identify which segment contains their allocation information. Stations can then decode only the relevant segment based on the PPDU version they are processing, ensuring they don't miss their allocation while avoiding unnecessary decoding of other segments.
Solution Approach 2:
The trigger frame structure预先 organizes user information fields by PPDU version, so receiving stations can immediately identify which field to decode based on the version they support. This preliminary organization eliminates the need for stations to decode the entire field list, improving processing efficiency while maintaining reliability.
Data Source
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AI summary
A method and a device for transmitting an A-PPDU in a wireless LAN system are proposed. Specifically, a receiving STA receives a trigger frame from a transmitting STA. The receiving STA transmits an A-PPDU to the transmitting STA on the basis of a trigger frame. The trigger frame includes a common information field, a first and a second special user information field, and a first and a second user information list field. The A-PPDU includes a first PPDU for a primary channel and a second PPDU for a secondary channel. The first special user information field and the first user information list field are variant fields for the first PPDU. The second special user information field and the second user information list field are variant fields for the second PPDU.