Multicast Data Transmission Timing and Area Matching
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Solution Overview
Problem
In multicast communication, it is challenging to reliably transmit information to terminal devices that may have moved since the initial transmission, as the timing of subsequent transmissions does not align with the device's location, leading to difficulties in re-transmitting data to devices that were previously in a designated area.
Innovation Solution
A communication system that generates and transmits a first combination including area information and identification information at the initial transmission time, and a second combination with the same identification information and data at a subsequent time, allowing terminal devices to determine if they are still in the designated area and process the data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If area information is transmitted only at initial transmission time, then transmission timing is simple, but terminal devices that have moved cannot receive data
Solution Approach 1:
The patent applies preliminary action by transmitting area information in advance at the initial transmission time before the terminal device may move. This allows the terminal device to store the area information and identification information beforehand, so that when data is re-transmitted later, the terminal can quickly determine if it is still in the designated area without requiring complex real-time location verification protocols.
Solution Approach 2:
The patent implements feedback by having the terminal device compare its current location with the stored area information and send back determination results. The transmission device then uses this feedback to decide whether to re-transmit data. This feedback mechanism ensures reliable data delivery to mobile terminals while maintaining relatively simple transmission timing through automated decision-making based on terminal responses.
2Reliability
If data is re-transmitted to ensure mobile terminals receive it, then data delivery reliability improves, but transmission efficiency decreases due to unnecessary re-transmissions
Solution Approach 1:
The patent uses feedback to resolve this contradiction by having terminal devices send determination results back to the transmission device. The terminal compares its current location with the stored area information and only requests data re-transmission if it is still in the designated area. This feedback mechanism ensures high data delivery reliability for mobile terminals while avoiding unnecessary re-transmissions to devices that have moved out, thus maintaining transmission efficiency.
Solution Approach 2:
The patent applies partial action by selectively re-transmitting data only to terminal devices that are still in the designated area, rather than broadcasting to all devices. This partial re-transmission approach ensures reliable data delivery to mobile terminals that need it while avoiding wasteful transmissions to devices that have moved out, thereby balancing reliability with transmission efficiency.
3Measurement precision
If identification information is transmitted with each data transmission, then terminal devices can accurately determine relevance, but information transmission overhead increases
Solution Approach 1:
The patent applies preliminary action by transmitting identification information together with area information at the initial transmission time. The terminal device stores this identification information along with the area information. When data is re-transmitted later, the terminal can use the pre-stored identification information to quickly and accurately determine if the new data is relevant to its location, without requiring the transmission of redundant identification information with each subsequent data packet. This reduces information transmission overhead while maintaining accurate area matching.
Data Source
AI summary
A generator generates a first combination including identification information associating area information indicating an area where data should be received and a timing when the area information should be transmitted, and the area information and that generates a second combination including the identification information in the first combination and data. A transmitter transmits one of the first combination and the second combination generated by the generator. The generator generates the second combination at a further timing subsequent to the timing associated with the identification information in the first combination. The transmitter transmits the first combination at the timing associated with the identification information in the first combination and transmits the second combination at the further timing.