WLAN PPDU Structure for Channel Bonding and MIMO
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Solution Overview
Problem
Current wireless LAN systems face limitations in channel bonding and MIMO techniques, particularly in supporting legacy user equipment and implementing channel bonding and MIMO simultaneously, which restricts flexibility and efficiency in medium access and throughput.
Innovation Solution
The introduction of a new PPDU structure that includes an enhanced directional multi-gigabit (EDMG) header and payload, allowing for channel bonding and MIMO support by adding a new field after the legacy preamble and header, enabling transmission across multiple channels and improving beamforming and spatial sharing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new PPDU structure with EDMG header is introduced to support channel bonding and MIMO, then adaptability and versatility improve, but device complexity increases
Solution Approach 1:
The PPDU structure is segmented into distinct fields: legacy preamble, legacy header, and new EDMG header. This segmentation allows legacy equipment to process only the legacy portion while new equipment can access the full structure, enabling backward compatibility without forcing all devices to handle the complete enhanced structure simultaneously.
Solution Approach 2:
The new EDMG header and payload are nested after the legacy preamble and header. This nested structure allows the enhanced functionality to be contained within the existing framework, where legacy devices ignore the nested portion and advanced devices utilize it, thus managing complexity through hierarchical organization.
2Productivity
If channel bonding and MIMO are implemented simultaneously, then throughput increases, but device complexity increases
Solution Approach 1:
The EDMG header serves multiple functions: it indicates channel bonding configuration, MIMO parameters, and beamforming information. This multi-functionality consolidates what would otherwise require separate signaling mechanisms, enabling simultaneous channel bonding and MIMO support while managing complexity through a unified header structure.
Solution Approach 2:
The header contains configurable parameters that allow dynamic adjustment of channel bonding width and MIMO spatial streams. By encoding these configurations as adjustable parameters rather than fixed structures, the system can adapt throughput and complexity levels based on device capabilities and channel conditions.
3Ease of operation
If TRN subfield structure is aligned with SC mode in OFDM mode, then ease of operation improves, but manufacturing precision requirements increase
Solution Approach 1:
The TRN subfield structure in OFDM mode is copied from the established SC mode structure. This copying approach allows OFDM implementations to leverage the well-understood SC training field organization, simplifying operation and deployment while maintaining structural consistency across different modulation modes.
Data Source
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AI summary
The present specification relates to a method for transmitting and receiving signals in a wireless local area network (WLAN) system and an apparatus therefor, the method comprising the steps of: generating a training sub-field consisting of a certain number of orthogonal frequency division multiplexing (OFDM) symbols; and transmitting, to a second STA, a signal including a header field and the training sub-field, wherein the transmitted signal is repeatedly transmitted T times (where T is a natural number) on the basis of information indicated by the header field after a data field.