TRN Field Length Indication in Wireless PPDU Headers
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Solution Overview
Problem
Existing WLAN standards face challenges in backward compatibility and efficient signal transmission, particularly in supporting legacy systems and channel bonding with Multiple Input Multiple Output (MIMO) technology, which limits the ability to accurately indicate the length of the Training (TRN) field in Physical Protocol Data Units (PPDU) across different systems.
Innovation Solution
The method involves configuring the TRN field length within the L-header of the PPDU, where the training length field indicates the TRN field length from the end of the PPDU in reverse order, and an extended training length field is used in the EDMG header for lengths exceeding the limit, ensuring compatibility with both legacy and advanced systems like IEEE 802.11ay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the training length field in the L-header indicates the TRN field length from the end of the PPDU in reverse order, then backward compatibility with legacy systems is maintained, but the ability to accurately indicate extended TRN field lengths for advanced systems like IEEE 802.11ay is limited
Solution Approach 1:
The training length indication is segmented into two parts: the training length field in the L-header for legacy compatibility, and the extended training length field in the EDMG header for advanced systems. This segmentation allows each field to serve its specific purpose without interfering with the other, resolving the contradiction between backward compatibility and extended length indication accuracy
Solution Approach 2:
The solution adds another dimension to the training length indication by introducing the extended training length field in the EDMG header. This additional dimension allows advanced systems to indicate extended TRN field lengths beyond what the legacy training length field can accommodate, while legacy systems continue to use the original field
2Productivity
If channel bonding with MIMO technology is implemented, then transmission rate and bandwidth are improved, but the complexity of indicating TRN field length across multiple channels and spatial streams increases
Solution Approach 1:
The extended training length field in the EDMG header serves multiple functions: it indicates the TRN field length for channel bonding scenarios, supports MIMO spatial streams, and maintains compatibility with legacy single-channel operations. This multi-functionality reduces the need for separate indication mechanisms for different advanced features
Data Source
AI summary
A method of transmitting and receiving a signal, which is transmitted by a station in a wireless communication system, is disclosed in the present specification. The method can include the steps of receiving a PPDU and performing beamforming training based on a TRN field of the received PPDU. In this case, a training length field belonging to an L-header field of the PPDU indicates a length of the TRN field from the timing at which the PPDU ends in reverse order and a length field belonging to the L-header field of the PPDU can indicate a length resulted from subtracting the length of the TRN field indicated by the training length field from a length of the PPDU after the L-header field.