MU-MIMO Pre-coding for Mixed WLAN Packet Formats
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Solution Overview
Problem
Current wireless communication systems face challenges in combining packets from different wireless communication standards, such as IEEE 802.11ac and IEEE 802.11ax, for downlink transmission, leading to potential interference and incomplete data transfer between stations supporting different standards.
Innovation Solution
A wireless communications method and apparatus that applies pre-coding to stream inputs with different packet formats, enabling the combination of packets from various standards into a single Multi-User Multiple-Input Multiple-Output (MU-MIMO) packet for transmission, using a digital baseband circuit and transmit circuit to generate pre-coded stream outputs and perform downlink MU-MIMO transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If packets from different WLAN standards are transmitted separately, then each standard can be transmitted without interference, but transmission efficiency decreases and multiple packets are required
Solution Approach 1:
The patent combines packets from different WLAN standards (e.g., 802.11ac and 802.11ax) into a single aggregated packet for downlink transmission. The access point merges multiple standard-specific packets into one unified packet structure that can be transmitted simultaneously to multiple stations, thereby improving transmission efficiency while maintaining standard compatibility through proper packet formatting and pre-coding.
Solution Approach 2:
The patent creates a universal packet aggregation mechanism that can handle multiple WLAN standards within a single transmission framework. The access point uses a unified packet structure that accommodates different standard requirements, allowing one packet to serve multiple functions across different standard families while maintaining backward compatibility.
2Productivity
If packets from different standards are combined into one packet, then transmission efficiency improves, but packet format compatibility becomes complex
Solution Approach 1:
The patent segments the aggregated packet into distinct sections or fields, each dedicated to specific WLAN standards. The packet structure is divided into multiple parts where each part follows the formatting requirements of its corresponding standard, allowing the access point to maintain complex multi-standard compatibility through structured segmentation rather than monolithic packet design.
Solution Approach 2:
The patent applies local quality by allowing different parts of the aggregated packet to have different formats and characteristics specific to their target standard. Each packet section is optimized for its specific standard's requirements, with appropriate pre-coding and formatting applied locally to each section, thereby managing complexity through differentiated local structures.
3Reliability
If pre-coding is applied to streams with different packet formats, then interference between channels is eliminated, but processing complexity increases
Solution Approach 1:
The patent applies pre-coding as a preliminary action before the actual transmission of the aggregated packet. The access point performs pre-coding operations on the different packet format streams in advance, preparing them for simultaneous transmission without interference. This preliminary processing ensures that when the packets are transmitted together, they do not interfere with each other, thereby eliminating channel interference through advance preparation.
Data Source
AI summary
A wireless communications method includes: obtaining a plurality of stream inputs, wherein the stream inputs include a first stream input complying with a first packet format and a second stream input complying with a second packet format, and the second packet format is different from the first packet format; applying pre-coding to the stream inputs to generate a plurality of pre-coded stream outputs, respectively; and performing wireless transmission upon the pre-coded stream outputs, wherein downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission is involved in the wireless transmission of the pre-coded stream outputs.