Have you ever had a headache because your IoT solution consumes battery power too quickly, or the cost of 3G/4G for thousands of sensors is increasing? If the answer is yes, then you are most likely looking for a low-power wide area network technology. This is not a "silver bullet" that solves all problems, but for LoRa LoRaWAN IoT applications that transmit long-range data, low bandwidth and especially super energy saving, this technology is one of the brightest choices. It helps engineers like us forget about worrying about replacing the battery for our devices for many months, even up to a decade.
LoRaWAN, NB-IoT, Sigfox: Put it on the scale, choose the right LPWAN technology for your project
Choosing accurate IoT data transmission technology from the beginning helps the project save billions of dong; and putting LoRaWAN, NB-IoT, Sigfox on the scale is a mandatory step for every solution engineer.
When entering the world of connected things, having a solid knowledge base is extremely important. If you have colleagues new to this field, guiding them through IoT Internet of Things for Beginners would be a great starting point. Back to the technical people's in-depth problem: What is LPWAN technology? Low Power Wide Area Network (LPWAN) is a "lifesaver" for devices that need to survive on a tiny battery for many years, transmitting data tens of kilometers away. Currently, as of 2026, the industrial IoT market is divided into two distinct camps. On one side is unlicensed spectrum (LoRaWAN, Sigfox) and on the other side is licensed spectrum under 3GPP standards (NB-IoT, LTE-M).
Core comparison criteria: Cost, coverage, battery life, and bandwidth
Battery life, coverage, low bandwidth and network infrastructure costs are the four core pillars that determine the success or failure of any IoT project deployed on a large scale.
At Pham Hai, I have seen many projects "fall apart in the middle of the road" just because of choosing the wrong communication wave. NB-IoT provides good bandwidth and low latency but consumes more battery and depends on the telecommunications carrier's transceiver station. Sigfox is super energy efficient and extremely cheap, but its bandwidth is extremely narrow, only sending a few dozen bytes per day. Meanwhile, LoRaWAN stands in the middle, excellently balancing battery life (up to 10 years) and low operating costs thanks to allowing you to build your own network infrastructure.
Detailed analysis: When should you choose LoRaWAN instead of NB-IoT or Sigfox?
The LoRaWAN NB-IoT Sigfox comparison is only really meaningful when tied to the actual problem: choosing LoRaWAN for a sporadic private network, and NB-IoT for an available public network.
Suppose you are designing a system for a large rubber farm in a remote area where phone signals are intermittent. At this time, using NB-IoT or considering LoRaWAN and LTE-M (which depends entirely on the network operator) will bring a very high risk of losing connection. You must build your own LoRaWAN Gateway to control the coverage area. On the contrary, if you do a smart water meter project in the city center, NB-IoT is more leisurely because you just need to "plug in the sim and run", taking advantage of Viettel or VNPT's signal towers. As forother LPWAN technologies like Sigfox, it is often suitable for simple tracking devices, sending SOS signals at extremely low frequencies.
Hands-on experience: A quick comparison of key specifications and deployment models
The table below visually summarizes technical specifications from frequency spectrum, latency to deployment model to help you make decisions easily.
| Criteria | LoRaWAN | NB-IoT/LTE-M | Sigfox |
|---|---|---|---|
| Băng tần | Unlicensed spectrum (Sub-GHz) | Licensed frequency spectrum (3GPP) | Unlicensed frequency spectrum |
| Băng thông | Low (Several hundred bps - 50 kbps) | Medium (Up to 250 kbps) | Very low (100 bps) |
| Mô hình triển khai | Public & Private (Can be self-built) | Public (Depends on network operator) | Public (Sigfox Dependent) |
Decoding from A-Z: What is LoRa, what is LoRaWAN and how does it work?
LoRa is a radio modulation technique at the physical layer, while LoRaWAN is a MAC layer network protocol that regulates how devices communicate and secures data.
Many new engineers often confuse these two concepts, collectively calling them LoRa. In fact, to deeply understand the LoRaWAN operating principle, we must break it down into two independent layers. Once data is collected and pushed through the Gateway, transferring it to the cloud often requires a lightweight protocol. You can learn details about MQTT protocol IoT data transfer protocol to combine and optimize the entire system's data flow from the base station to the server.
LoRa: The Physical Foundation - The Power of Radio Waves and Chirp Spread Spectrum Modulation.
LoRa technology uses exclusive Chirp Spread Spectrum technology to help signals travel extremely far, penetrate walls well and strongly resist interference in complex environments.
What is the essence of LoRa? It is the physical layer (PHY), which uses the Chirp Spread Spectrum (CSS) modulation technique. This core technology is developed and copyrighted by Semtech group. CSS technology allows radio signals to travel very long distances with extremely low energy consumption. The "chirp" sound in physics is similar to the sound of birds singing, the frequency gradually increases or decreases over time, making this radio wave band extremely "durable", easily penetrating concrete obstacles in urban environments without too much loss.
LoRaWAN: Network Protocol - How devices "talk" to each other.
LoRaWAN is a wide area network protocol managed by the LoRa Alliance that defines system architecture, device management, and ensures end-to-end encryption security.
So what is LoRaWAN and how is it applied in practice? This is the MAC (Media Access Control) layer that lies on top of the LoRa physical layer, maintained and developed by the global alliance LoRa Alliance. It is a set of rules that regulate which devices are allowed to send data at what time, optimize transmission speed (Adaptive Data Rate) and especially the AES-128 bit encryption mechanism. This contributes to enhancing absolute security for the data flow from the sensor to the server, preventing information theft attacks.
LoRaWAN network architecture: From end device, Gateway, to Network and Application Server.
A standard system includes an End Node that collects data, a Gateway that receives signals, a Network Server that manages network flows, and an Application Server that handles display.
The network architecture of this technology is designed in a Star-of-Stars shape, helping to optimize battery consumption.
- Thiết bị cuối (End Nodes): Là các cảm biến (nhiệt độ, độ ẩm, GPS) nằm ngoài thực địa. Nếu bạn thích tự vọc vạch làm node mạng, bài viết Arduino hướng dẫn lập trình vi điều khiển hoặc tham khảo ESP32 ESP8266 dự án IoT Wi-Fi giá rẻ sẽ cung cấp nền tảng phần cứng tuyệt vời trước khi bạn hàn thêm module LoRa vào để thử nghiệm.
- Gateway LoRaWAN: Đóng vai trò như trạm thu phát trung tâm. Nó "lắng nghe" sóng vô tuyến từ hàng ngàn node xung quanh và đẩy gói tin qua internet (Ethernet/Wifi/4G) lên server.
- Network Server: "Bộ não" của hệ thống. Nó chịu trách nhiệm xác thực thiết bị, lọc các gói tin trùng lặp (do nhiều Gateway cùng nhận được 1 tín hiệu), và điều khiển tốc độ truyền tải.
- Application Server: Nơi dữ liệu thô biến thành biểu đồ trực quan, đưa ra các cảnh báo (alert) cho người dùng cuối trên app điện thoại hoặc web.
LoRaWAN is more than just theory: Real-world applications change the game
Thanks to IoT's energy-saving long-range data transmission capabilities, this technology is providing strong coverage from farms and streets to industrial factories.
Unlike compact residential housing models such as Smart home self-built smart home that often use Zigbee, Z-Wave or Wi-Fi, projects using LoRaWAN solve the problem of large spaces extremely smoothly. In the world of machine learning communication (M2M - Machine to Machine), this long-range data transmission IoT solution has proven its practical effectiveness at scale.
Smart agriculture: Monitor soil moisture, manage irrigation remotely, save every drop of water
LoRaWAN application in smart agriculture helps farm owners monitor the microclimate over an area of thousands of hectares without worrying about pulling power lines or losing signal.
On large-scale Central Highlands coffee farms, using a 4G SIM for each soil moisture sensor is impossible because the maintenance cost is too expensive. LoRaWAN application in smart agriculture allows hundreds of environmental monitoring sensor nodes to be plugged deep into the ground. Their batteries can last 3-5 years without needing to be replaced. The water pumping system is only activated when the soil is truly dry below the allowed threshold, helping to save water resources and optimize fertilizer costs extremely effectively.
Smart city: From parking management, street lighting to automatic garbage collection.
Deploying smart city LoRaWAN helps optimize energy for street lighting, parking lot monitoring, and automating meter readings.
Have you noticed these street lamp posts that automatically adjust brightness according to the weather and traffic density? That is a typical application of smart street lighting. The LoRaWAN smart city network also acquires the smart meter meter reading segment (water, electricity, gas). Instead of employees copying by hand every month, these meters automatically send readings to the center once a day, completely eliminating human errors and minimizing personnel costs.
Smart Factory and Logistics: Track assets, monitor environmental conditions in warehouses
The application of LoRaWAN for smart factories and logistics helps manage assets in real time in large industrial parks with lots of interference.
In an industrial environment full of machinery and metal walls, Wi-Fi waves often "die prematurely". LoRaWAN for smart factories has very good ability to penetrate interference. Pallets of high-value goods are tagged for asset management in the logistics supply chain. To make the system smarter and reduce the load on the cloud, combining on-site computing is an inevitable trend. The application of Edge AI to process AI at edge devices combined with the power of boards such as Raspberry Pi, a practical project for developers as a LoRa data collection gateway is popular with many R&D engineers in Vietnam.
Before "spending money": Advantages, disadvantages and costs of deploying LoRaWAN you need to know
Objectively evaluating LoRaWAN pros and cons, coverage and deployment costs helps you make accurate estimates and avoid costly technical traps.
At Pham Hai, I always advise business partners not to "deify" any technology. Everything in engineering has trade-offs. Understanding the limits of technology is the best way to ensure project success.
Advantages that cannot be overlooked: Impressive long range, maximum energy savings and low operating costs.
LoRaWAN coverage can reach up to 15km in rural areas, accompanied by outstanding energy savings for thousands of terminal devices.
Tầm phủ sóng LoRaWAN thực sự là vũ khí tối thượng. Ở môi trường nông thôn thoáng đãng, một gateway được lắp trên cột cao 30m có thể "bắn" sóng xa tới 15-20km. Trong khu vực thành thị dày đặc bê tông cốt thép, tầm phủ sóng 2-3km vẫn duy trì hoạt động rất ổn định. Nhờ cơ chế ngủ đông sâu (Deep Sleep) của các thiết bị Class A, bài toán về tầm xa và tiết kiệm năng lượng được giải quyết triệt để, giúp giảm thiểu tối đa chi phí bảo trì thay pin.
Disadvantages to consider: Low bandwidth, high latency and not suitable for real-time applications
The biggest limitations of this technology are high latency, extremely low bandwidth, and the complete inability to transmit images or videos due to physical limitations.
Never expect to use LoRa to transmit video from security cameras! With low bandwidth (usually only a few hundred bps to a maximum of 50 kbps), it is only designed to send small packets of a few bytes of text (such as temperature, humidity, GPS coordinates). In addition, the network latency is quite high because the sensor nodes often "sleep" to save battery. When there is a control command from the server, the device must wake up to receive it, so it is not suitable for applications that need to respond immediately in milliseconds.
Cost problem: How much does it cost for Gateway, end devices and network infrastructure?
The cost of deploying a separate LoRaWAN network includes the purchase of the Gateway device (from 500 to 1500 USD) and the annual Network Server software maintenance fee.
Talking about the actual LoRaWAN deployment cost, an industrial standard outdoor Gateway set (IP67 waterproof) currently costs about 500 - 1500 USD depending on the brand. Sensor network nodes are much cheaper, ranging from 20 - 50 USD/piece. Although you have to spend an initial investment on hardware and setting up network infrastructure, compared to having to pay a monthly 4G SIM subscription fee for 1000 devices for 5 years, the private network LoRaWAN system (Private Network) will be profitable and payback very quickly after only 1-2 years of operation.
Obviously, LoRa LoRaWAN IoT long-range data transmission is not born to compete with or replace Wifi or 4G/5G. It is a perfect piece for the panorama of the IoT world, especially silent, persistent monitoring applications over time. Choosing IoT data transmission technology depends entirely on your specific budget, terrain, and data type. Understanding the advantages and disadvantages of LoRaWAN compared to NB-IoT or Sigfox is the key to building an optimal system, instead of following "trendy" technologies that do not bring practical results.
Are you planning an IoT project that requires long-range connectivity and battery saving? Is your system having trouble choosing hardware or building an internal server? Please share your ideas or questions in the comments section below, Pham Hai is happy to discuss to find the most optimal solution!
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