Physical Layer Preamble Fields for MU-MIMO and Multi-AP Signaling
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Solution Overview
Problem
As new wireless communication protocols enable enhanced features, there is a need for new preamble designs to support signaling regarding these new features and packet formats, particularly in scenarios involving full-bandwidth multi-user multiple-input multiple-output (MU-MIMO), single-user (SU) preamble puncturing, hybrid automatic repeat request (HARQ), and multi-AP coordination.
Innovation Solution
The physical layer preamble is utilized to indicate bandwidth, puncturing of subchannels, HARQ information, and multi-AP communications through various signaling mechanisms, including coordinated beamforming (CoBF), joint transmission (JT), and coordinated orthogonal frequency division multiple access (C-OFDMA).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new preamble designs are introduced to support enhanced wireless communication features (full-bandwidth MU-MIMO, SU preamble puncturing, HARQ, multi-AP coordination), then the functionality and adaptability of the wireless protocol are improved, but the device complexity and difficulty of detecting and measuring the protocol increase
Solution Approach 1:
The preamble is segmented into distinct functional fields including bandwidth indication field, puncturing indication field, HARQ information field, and multi-AP coordination field. Each field independently handles specific signaling requirements, allowing the system to support multiple enhanced features (full-bandwidth MU-MIMO, SU preamble puncturing, HARQ, multi-AP coordination) without creating a monolithic complex protocol structure.
Solution Approach 2:
The physical layer preamble is designed as a universal structure that can indicate multiple different features through its various fields. The same preamble format can simultaneously convey bandwidth information, puncturing patterns, HARQ parameters, and multi-AP coordination details, eliminating the need for separate specialized preambles for each feature and thereby managing complexity while maintaining versatility.
2Loss of information
If multiple signaling mechanisms are incorporated in the preamble to indicate bandwidth, puncturing, HARQ information, and multi-AP communications, then the information completeness and protocol capability are improved, but the difficulty of detecting and measuring the preamble increases
Solution Approach 1:
The preamble information is segmented into distinct fields: bandwidth indication field for channel width specification, puncturing indication field for subchannel allocation patterns, HARQ information field for hybrid automatic repeat request parameters, and multi-AP coordination field for coordinated beamforming and joint transmission control. This segmentation allows receivers to process each type of information independently through dedicated detection algorithms, reducing overall detection complexity despite the comprehensive information provided.
Solution Approach 2:
The structured preamble fields act as intermediaries that organize and separate different types of signaling information. Each field serves as a mediator that carries specific information in a standardized format, allowing the receiver to systematically extract and process bandwidth, puncturing, HARQ, and multi-AP coordination information without being overwhelmed by the combined complexity of all signals.
Data Source
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Figure 3A~3B
AI summary
This disclosure provides methods, devices and systems for generating packet preambles. Some implementations more specifically relate to preamble designs for special cases such as, for example, full-bandwidth multi-user multiple-input multiple-output (MU-MIMO), single-user (SU) preamble puncturing, hybrid automatic repeat request (HARQ), and multi-AP coordination. Multi-AP coordination may refer to coordinated beamforming (CoBF), joint transmission (JT), or coordinated orthogonal frequency division multiple access (C-OFDMA). Additionally, or alternatively, some implementations more specifically relate to preamble designs that accommodate signal fields of different cases.