PPDU Duration Signaling with TRN and PE Fields for WLAN Reception
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Solution Overview
Problem
In wireless local area networks, accurately determining the transmission duration of a physical layer protocol data unit (PPDU) is challenging, especially in high-frequency scenarios where signal attenuation is significant, affecting reliable data reception.
Innovation Solution
The proposed solution involves generating a PPDU with a data field, training TRN field, and packet extension (PE) field, and including indication information to specify the transmission duration of these fields, allowing the receiving apparatus to accurately determine the total or partial duration for correct reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam training is performed in high-frequency communication scenarios, then directional transmission accuracy is improved, but transmission duration is extended
Solution Approach 1:
The patent performs beam training in advance before actual data transmission. The TRN field is included in the PPDU structure to enable preliminary beam direction training, allowing the receiving device to prepare the optimal receiving beam before the data payload arrives, thus resolving the contradiction between achieving directional accuracy and minimizing transmission duration.
2Loss of time
If packet extension field is added to PPDU, then processing time for receiving apparatus is increased, but PPDU structure complexity is increased
Solution Approach 1:
The patent segments the PPDU structure into distinct functional fields including data field, TRN field, and PE field. The PE field is specifically designed as a separate packet extension field that can be independently configured and processed. This segmentation allows the receiving apparatus to process different fields at appropriate times, gaining necessary processing time without requiring the entire structure to be more complex.
3Measurement precision
If indication information is added to PPDU, then transmission duration determination accuracy is improved, but information overhead is increased
Solution Approach 1:
The patent extracts the transmission duration indication from the main data payload and places it in a dedicated indication information field within the PPDU structure. This extracted indication information specifically signals the transmission duration to the receiving device, enabling accurate determination without requiring the receiving device to parse through the entire data payload, thus minimizing information overhead while maintaining determination accuracy.
Data Source
AI summary
This application provides a communication method and apparatus, to provide a solution for determining transmission duration of a PPDU when the PPDU is transmitted between a first apparatus and a second apparatus. The method includes: The first apparatus generates a PPDU, where the first PPDU includes a data field, a TRN field, and at least one PE field, the first PPDU further includes first indication information, and the first indication information represents transmission duration of a part or all of fields in the first PPDU; and the first apparatus sends the first PPDU to the second apparatus. The second apparatus may determine total transmission duration of the first PPDU based on the first indication information, or may further determine transmission duration of a part or all of fields in the first PPDU, to accurately receive the first PPDU.