Wi-Fi Synchronization Messaging With Fixed MCS and Priority Control
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Solution Overview
Problem
Existing synchronization methods in Wi-Fi systems face challenges in maintaining accurate timing and continuity of audio and video streams due to network delays and packet losses, which affect the quality of multimedia experiences.
Innovation Solution
A method and apparatus for synchronization that involves transmitting and receiving messages to calculate offsets using a fixed modulation and coding scheme (MCS) index, prioritizing transmission opportunities to prevent errors from message delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable MCS index is used for synchronization messages, then transmission efficiency is improved, but transmission reliability deteriorates due to message delays
Solution Approach 1:
The patent applies different MCS index selection strategies to different message types: synchronization messages (first and third messages) use fixed or limited MCS index values for reliability, while other data transmissions can use variable MCS indices for efficiency. This local differentiation resolves the contradiction by ensuring critical synchronization messages maintain reliability while overall system efficiency is preserved.
Solution Approach 2:
The patent pre-configures a limited set of MCS index values (e.g., {0, 1, 2, 3} or {3, 4, 5, 6}) for synchronization messages before transmission occurs. This beforehand preparation ensures that when synchronization messages are transmitted, they use predetermined reliable MCS settings, preventing transmission errors and maintaining synchronization accuracy without compromising overall system efficiency.
2Measurement precision
If highest priority is given to synchronization messages, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments message handling into distinct categories: synchronization messages (first and third messages) with fixed/limited MCS indices and highest priority, and other data messages with variable MCS indices and normal priority. This segmentation simplifies device complexity by providing clear, rule-based differentiation rather than requiring complex real-time decision-making for each message.
Solution Approach 2:
The patent changes the priority parameter and MCS index parameter for synchronization messages specifically, setting them to highest priority and fixed/limited values respectively. This parameter change approach maintains synchronization accuracy while managing device complexity through straightforward parameter configuration rather than complex algorithms.
Data Source
AI summary
A method and a device for synchronization are provided. A method of a first device is provided. The method includes transmitting a first message related to calculation of a first offset for synchronization with a second device, transmitting a second message including information regarding a timepoint at which the first message was transmitted from the first device, receiving a third message related to calculation of a second offset for synchronization with the second device, and transmitting a fourth message including information regarding a timepoint at which the third message was received by the first device. With regard to the first message and the third message, an MCS configuration corresponding to one fixed modulation and coding scheme (MCS) index among available candidate MCS index values is applied, or one MCS configuration within an MCS subset configured by MCS configurations corresponding to at least one MCS index equal to or lower than an MCS index among the available candidate MCS index values is applied, and the highest priority among priorities related to securing transmission opportunities is applied.