LoRaWAN Frequency Point Synchronization via Server Feedback
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Solution Overview
Problem
In LoRaWAN systems, the base station is not informed when a terminal changes its frequency point, leading to data frames being sent on the original frequency point, which are not received by the terminal.
Innovation Solution
The server transmits a first beacon frequency point request message to a base station, which instructs the terminal to change its beacon frame receiving frequency point. After receiving a beacon frequency point acknowledgment message, the server timely transmits a second beacon frequency point request message to the base station to change its own frequency point, ensuring communication with the terminal on the new frequency point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the server transmits a beacon frequency point request message to the base station to change the terminal's frequency point, then the terminal can change its receiving frequency point, but the base station is not informed of the change and continues to transmit on the original frequency point
Solution Approach 1:
The patent introduces a feedback mechanism where the base station reports terminal frequency point changing capabilities to the server, and the server responds with frequency point assignment commands. This closed-loop feedback ensures both the terminal and base station have synchronized frequency point information, resolving the information loss problem while maintaining frequency point adaptability.
2Ease of operation
If the base station transmits messages to the terminal on the original frequency point after the terminal has changed frequency point, then the base station maintains its original communication pattern, but the terminal cannot receive the data frames
Solution Approach 1:
The patent implements preliminary action by having the base station first obtain the terminal's frequency point changing capability information before attempting communication. The server then pre-assigns frequency points based on this capability, ensuring the base station transmits on the correct frequency point from the outset, thereby maintaining operational simplicity while ensuring communication reliability.
3Device complexity
If the server uniformly allocates frequency points without informing the base station of terminal changes, then resource utilization is simplified, but communication efficiency deteriorates due to frequency point mismatches
Solution Approach 1:
The patent introduces the server as an intermediary that coordinates frequency point assignments between terminals and base stations. The server receives capability information from base stations, processes frequency point assignments uniformly, and distributes the assigned frequency points back to both terminals and base stations. This intermediary role maintains simple uniform allocation while ensuring communication efficiency through centralized coordination.
Data Source
AI summary
Embodiments of the present disclosure provide frequency point changing methods and apparatuses. The method can include: transmitting a first beacon frequency point request message to a first base station, the first beacon frequency point request message comprising first frequency point information, wherein the first base station is enabled to transmit the first beacon frequency point request message to a terminal, and the terminal is enabled to change a beacon frame receiving frequency point according to the first frequency point information in the first beacon frequency point request message; receiving a beacon frequency point acknowledgment message transmitted by at least one second base station; and transmitting a second beacon frequency point request message to the at least one second base station, the second beacon frequency point request message comprising the first frequency point information, wherein the at least one second base station is enabled to change a beacon transmitting frequency point according to the first frequency point information in the second beacon frequency point request message.