Wireless Signal Transmission for Electronic Displays
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Solution Overview
Problem
Existing signal transmission systems for electronic display devices, such as electronic shelf labels, face inefficiencies in updating image and audio data, particularly in switching from broadcast to unicast methods, which can lead to increased data throughput and potential data loss or delays in ensuring all devices are updated.
Innovation Solution
A wireless signal transmission system that initially broadcasts an access control address list to electronic display devices, allowing devices to acknowledge receipt and then switches to unicast mode for specific video and audio packet data transmission, ensuring targeted updates and reducing unnecessary data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadcast method is used for transmitting data to all electronic display devices, then all devices can receive updates, but data throughput decreases and unnecessary data transmission occurs
Solution Approach 1:
The patent segments the transmission process into two distinct phases: a broadcast phase for transmitting the access control address list to all devices, and a unicast phase for transmitting video packet data only to authorized devices. This segmentation allows the system to achieve both complete data distribution and high throughput by targeting transmissions only to necessary devices in the second phase
Solution Approach 2:
The system performs a preliminary broadcast transmission of the access control address list before the main data transmission. This preliminary action enables devices to identify themselves and determine whether they should receive subsequent video packet data, allowing the system to switch to efficient unicast mode for authorized devices while avoiding unnecessary transmissions to unauthorized devices
2Productivity
If unicast method is used for transmitting data to specific devices, then data throughput increases, but it is difficult to ensure all devices are updated
Solution Approach 1:
The system performs a preliminary broadcast transmission of the access control address list to all electronic display devices before initiating unicast transmissions. This preliminary action ensures that every device receives the authorization information needed to determine whether it should expect subsequent video packet data, guaranteeing that all devices are properly notified while allowing efficient targeted transmissions to follow
Solution Approach 2:
The system uses feedback from devices in the form of ACK (acknowledgment) messages to determine whether to continue unicast transmissions. When the wireless signal transmission device receives an ACK message from a device whose address is in the access control address list, it switches to unicast mode for that specific device, ensuring reliable delivery while maintaining high throughput for the overall system
3Reliability
If broadcast method is used, then all devices receive transmissions, but energy is wasted on unnecessary data transmission to devices that don't need updates
Solution Approach 1:
The patent segments the transmission process into a brief broadcast phase for the access control address list and a targeted unicast phase for video packet data. This segmentation ensures that energy-intensive data transmissions occur only to devices that need updates, while the initial broadcast phase consumes minimal energy due to the small size of the access control address list
Solution Approach 2:
The system performs a preliminary broadcast of the access control address list that contains MAC addresses of authorized devices. This preliminary action enables receiving devices to determine whether they should expect subsequent video packet data, allowing the system to avoid wasting energy transmitting large amounts of video data to devices that don't need updates
Data Source
AI summary
A signal transmission system of electronic display devices includes a plurality of electronic display devices and a wireless signal transmission device. The wireless signal transmission device broadcasts a first packet data to the electronic display device. The first packet data comprises an access control address list, and the access control address list comprises the MAC address of a first group of electronic display device. When the wireless signal transmission device receives an acknowledgement (ACK) message from at least a first electronic display device of the first group of electronic display devices, the wireless signal transmission device changes the method of transmission from broadcast to unicast in order to transmit second packet data to the first electronic display device, wherein the second packet data comprises video packet data.