Unified Common Preamble Signaling for DCM WLAN Uplinks
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Solution Overview
Problem
The uplink multi-user transmission preamble in WLAN networks faces challenges in ensuring that the access point (AP) and third-party stations correctly interpret the signaling field due to the complexity introduced by new technologies like Dual Carrier/Sub-Carrier/Tone Modulation (DCM), requiring improved preamble design for extended coverage and reliability.
Innovation Solution
Configuring transmission parameters for secondary nodes, including repetition modes, phase rotation, and cyclic shift diversity of common preambles, ensuring uniformity in preamble signaling across multiple nodes, and allowing for correct interpretation by the AP and other stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new technologies like DCM are introduced to improve transmission performance, then coverage and reliability are extended, but the preamble design becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the signaling field structure in the preamble to accommodate DCM technology. Specifically, it changes the modulation scheme parameter from traditional QPSK to support DCM modes, and adjusts the field organization to include new indication fields for DCM parameters while maintaining backward compatibility with legacy devices.
Solution Approach 2:
The patent segments the preamble structure into distinct functional fields: legacy compatibility fields, new signaling fields for DCM indication, and data payload fields. This segmentation allows the complex DCM parameters to be organized in manageable sections, making the overall preamble design more systematic and easier to process despite the increased complexity.
2Productivity
If multiple secondary nodes transmit simultaneously in uplink multi-user transmission, then network productivity is improved, but the probability of correct interpretation of signaling fields by AP and third-party stations decreases
Solution Approach 1:
The patent introduces an intermediary signaling mechanism where the preamble contains explicit indication fields that mediate between multiple transmitting nodes and the receiving stations. These indication fields act as intermediaries that carry essential interpretation information, enabling AP and third-party stations to correctly decode signaling fields from different secondary nodes simultaneously transmitting in the uplink.
Solution Approach 2:
The patent applies preliminary action by embedding all necessary interpretation information in the preamble before the actual data transmission begins. The signaling fields in the preamble provide advance notice of modulation schemes, coding rates, and other critical parameters, allowing receiving stations to prepare correct interpretation protocols before the multi-user data transmission starts, thus ensuring accuracy even when multiple nodes transmit simultaneously.
Data Source
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AI summary
A data transmission method comprises: a main node configures a transmission parameter for sending of radio frames by N secondary nodes in uplink multi-user transmission, N being a positive integer, wherein the transmission parameter comprises at least one of a repetition mode of a pre-set signaling field, a phase rotation mode of a sub-channel of a common preamble, a cyclic shift diversity parameter of a space-time stream/transmission chain of a common preamble, and a transmission mode, the transmission mode comprising an ordinary transmission mode or a dual carrier modulation (DCM) transmission mode; and then receives a radio frame sent by at least one of the N secondary nodes. The solution can ensure that a common preamble of multiple uplink users is unified, such that an AP for triggering the uplink multi-user transmission and a third-party station can correctly interpret a signaling field in a received preamble.