Wireless Broadcast Synchronization for Reliability
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Solution Overview
Problem
In broadcast/multicast communication, the lack of feedback in unidirectional communication leads to reduced communication quality and reliability due to frame errors caused by poor environments or low data rates, limiting capacity.
Innovation Solution
A wireless communication system where multiple transmission devices convert and broadcast the same wireless frames at the same timing using the same Modulation and Coding Scheme (MCS), with a control device coordinating transmission timing and MCS based on data rate and received power values, ensuring synchronized transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast/multicast communication is performed unidirectionally without response frames, then communication capacity is maintained at basic levels, but communication quality and reliability deteriorate due to lack of feedback information
Solution Approach 1:
The patent implements a feedback mechanism where reception devices send response frames to transmission devices in broadcast/multicast communication. The transmission device transmits a frame and receives a response frame from the reception device, enabling the transmission device to acquire feedback information about communication quality and reception status, thereby improving communication reliability without significantly reducing capacity
Solution Approach 2:
The patent segments the broadcast/multicast communication into distinct transmission and reception phases with separate frame structures. The communication is divided into: (1) transmission device sending broadcast/multicast frame, (2) reception device receiving and processing, (3) reception device sending response frame, and (4) transmission device receiving feedback. This segmentation allows bidirectional communication while maintaining broadcast/multicast functionality
2Reliability
If transmission rate is reduced to lower frame error rate, then communication reliability improves, but communication capacity deteriorates
Solution Approach 1:
The patent dynamically adjusts the Modulation and Coding Scheme (MCS) based on feedback information received from reception devices. The transmission device can select different MCS levels (e.g., MCS0-MCS9 with varying data rates and error correction capabilities) depending on the reported communication quality, allowing optimization between reliability and capacity in real-time rather than using a fixed low rate
3Productivity
If multiple transmission devices transmit simultaneously without coordination, then communication capacity increases, but transmission reliability deteriorates due to timing misalignment and interference
Solution Approach 1:
The patent synchronizes multiple transmission devices to transmit at the same timing using the same MCS. By coordinating transmission timing and parameters across multiple devices, the system creates equivalent transmission conditions (equipotentiality) that prevent interference and timing misalignment, allowing multiple devices to transmit simultaneously without degrading reliability
Data Source
AI summary
A wireless communication system includes a plurality of transmission devices configured to receive broadcast/multicast data transmitted from a broadcast/multicast data transmission device, convert the broadcast/multicast data into wireless frames, and broadcast/multicast the wireless frames to a plurality of reception devices, and the plurality of reception devices configured to receive the wireless frames broadcasted/multicasted from the plurality of transmission devices and acquire the broadcast/multicast data, and each of the plurality of transmission devices includes a broadcast/multicast transmission unit configured to generate the same wireless frame from the broadcast/multicast data and broadcast/multicast the generated wireless frame at the same transmission timing using the same MCS.