LoRaWAN Terminal Node Channel Selection and Load Balancing
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Solution Overview
Problem
Existing LoRaWAN technologies face inefficiencies due to unbalanced channel load and high control overhead, particularly in multi-channel wireless networks, leading to reduced channel throughput and performance degradation when transmitting small data.
Innovation Solution
A device and method that implement a terminal node competition unit with an adaptive contention window algorithm and channel selection based on queuing rules, separating control and data channels to minimize load balancing and overhead, allowing efficient channel utilization even with small data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a distributed queue protocol is applied to LoRaWAN media access method, then channel throughput is improved, but control overhead increases significantly
Solution Approach 1:
The patent segments the channel access process into two distinct phases: a contention resolution phase using DQ protocol for collision-free access, and a data transmission phase. This segmentation allows the control overhead to be concentrated in the initial contention phase rather than being repeated with every data transmission, thereby improving overall efficiency while maintaining manageable control overhead levels.
Solution Approach 2:
The patent performs preliminary contention resolution and channel allocation before actual data transmission. By using the DQ protocol to establish transmission rights and allocate channels in advance, the system eliminates the need for repeated control signaling during data transmission, significantly reducing control overhead for small data packets.
2Ease of operation
If multiple nodes randomly select channels, then channel access is simplified, but channel load becomes unbalanced
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors channel load conditions and provides guidance to terminal nodes for channel selection. Terminal nodes use this feedback information to adjust their channel selection, ensuring balanced load distribution across multiple channels while maintaining relatively simple access procedures.
Solution Approach 2:
The patent introduces dynamic channel allocation where channel assignments are adjusted based on real-time traffic conditions and load balancing requirements. The system can switch between random channel selection and scheduled channel allocation, adapting to different traffic patterns to maintain both simplicity and load balance.
Data Source
AI summary
Disclosed is a device for resolving high-speed competition and distributing multi-channels in consideration of large-scale access based on LoRaWAN that enables efficient and stable communication through limited channel resources in a large-scale wireless transmission environment through a wireless communication wide area network. The device includes a terminal node competition unit for receiving a synchronization beacon and transmitting an access request signal to a base station, and performing an aptive contention window algorithm and enabling a terminal node to enter a transmitter according to a feedback packet (FBP) competition result when the FBP is received from the base station; and a terminal node transmitter for selecting a channel according to queuing rules and checking data transmission queue (DTQ) order, transmitting data when the DTQ order is a transmission turn, standing by FBP reception, and determining whether a contention resolution interval is ended to perform a DTQ reassignment process.