Multicast Communication Apparatus Mode Switching
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Solution Overview
Problem
In wireless communication, transmitting the same data to multiple receiving terminals using one-to-one unicast communication is inefficient, leading to redundant data transmission and increased time and frequency band occupation.
Innovation Solution
Implementing a communication apparatus that operates in publisher or subscriber modes within multicast groups, allowing for efficient one-to-many data transmission through multicast communication, where a publisher transmits data and subscribers receive it directly or through other apparatuses, with mode switching based on data reception status and publisher density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one unicast communication is used to transmit the same data to multiple receiving terminals, then each terminal can receive the data reliably, but redundant data transmission occurs and time and frequency band occupation increase
Solution Approach 1:
Multiple unicast communication channels are merged into a single multicast channel. The patent implements multicast communication where one transmission terminal can send data to multiple receiving terminals simultaneously through a shared communication channel, eliminating redundant transmissions while maintaining reliable data delivery to all subscribers.
2Reliability
If one-to-one unicast communication is used to transmit the same data to multiple receiving terminals, then each terminal can receive the data reliably, but redundant data transmission occurs and frequency band occupation increases
Solution Approach 1:
Multiple dedicated frequency bands for unicast communication are merged into a shared frequency band for multicast communication. The patent allows multiple subscribers to share the same frequency band simultaneously, reducing total frequency band occupation while ensuring reliable data reception through multicast protocols.
3Productivity
If multicast communication is implemented with dynamic mode switching, then data transmission efficiency improves and redundant transmission is reduced, but system complexity increases
Solution Approach 1:
The communication system implements dynamic mode switching between unicast and multicast operations. Transmission terminals and receiving terminals can dynamically change their communication mode based on real-time conditions such as the number of subscribers, data type, and network state, optimizing transmission efficiency while managing system complexity through adaptive control.
Solution Approach 2:
The communication system automatically determines whether to use unicast or multicast mode without requiring manual configuration. The terminals self-manage their communication mode based on pre-stored ToC information and real-time reception status, reducing the need for complex centralized control while maintaining high transmission efficiency.
Data Source
AI summary
A mode of a publisher or a subscriber is stored. Also, a first identifier indicating affiliation to a first group is stored. In a case of the publisher, a transmission message including ToC information, which is a list of the first identifiers and data to be transmitted, is transmitted to an outside. In a case of the subscriber, when a received message includes the first identifier, data included in the message is stored into a non-volatile memory, and when it is determined that all data in the ToC information stored in the received message are already received and that the number of publishers is less than a threshold, the stored mode is changed to the publisher.