The rapid development of the Internet of Things puts forward higher requirements for wireless communication technology. The LPWAN (low-power Wide-Area Network, low-power Wide area network) is also rapidly emerging. NB-IoT and LoRa are typical representatives among them, and are also the two most promising low-power wide area network communication technologies. The two technologies of NB-IoT and LoRa have different technical and commercial characteristics, so there will be differences in application scenarios. Here will explain the difference between the two, and explain the respective suitable application scenarios.
IoT is the abbreviation of Internet of Things.The literal translation is "Internet of Things", and the accurate translation should be "Internet of Things". The Internet of Things (Internet of Things) is also known as the sensor network. Briefly speaking, it is the extension of the Internet from people to things. "Internet of Things" (Internet of Things) refers to a huge network formed by combining various information sensing devices, such as radio frequency identification devices, infrared sensors, global positioning systems, laser scanners and other devices with the Internet. Its purpose is to connect all items to the network for easy identification and management.
The "Internet of Things" refers to a huge network formed by combining various information sensing equipment, such as radio frequency identification (RFID) devices, infrared sensors, global positioning systems, laser scanners and other devices with the Internet. Its purpose is to connect all items to the network for easy identification and management. The recent rise of the concept of the Internet of Things has positive driving factors behind it, so that the market has formed a relatively unified expectation: the Internet of Things market has at least a trillion-plus market space.
LoRa was born earlier than NB-IoT. In August 2013, Semtech released a new type of chip based on ultra-long range low-power data transmission technology (Long Range, LoRa) below 1GHz to the industry.Its receiving sensitivity has reached an astonishing -148dbm. Compared with other advanced sub-GHz chips in the industry, the highest receiving sensitivity is improved by more than 20db, which ensures the reliability of network connection.
It uses chirp spread spectrum modulation technology, which maintains the same low power consumption characteristics as FSK (frequency shift keying) modulation, and significantly increases the communication distance, while improving network efficiency and eliminating interference, that is, different spread spectrum Serial terminals will not. . interfere with each other even if they use the same frequency to transmit at the same time.Therefore, the Concentrator/Gateway developed on this basis can receive and process data from multiple nodes in parallel, greatly expanding the system capacity.
Linear spread spectrum has been used in military and space communications for decades because it can achieve long communication distance and robustness against interference, and LoRa is the first low-cost implementation for commercial use. With the introduction of LoRa, the situation in the field of embedded wireless communication has undergone a radical change. This technology changes the previous trade-off between transmission distance and power consumption, and provides a simple communication system that can achieve long-distance, long battery life, large capacity, and low cost.
LoRa mainly operates in free frequency bands around the world (ie, unlicensed frequency bands), including 433, 868, 915 MHz, etc. The LoRa network is mainly composed of four parts: terminal (built-in LoRa module), gateway (or base station), server and cloud, and application data can be transmitted in both directions.
LoRa technology has won numerous fans a long time ago because of its excellent characteristics in all aspects. At the same time that the NB-IOT technology vigorously promoted by Huawei and Mobile has swept the water and gas metering circle, the momentum of NB-IOT has also appeared to be taken care of on many functional issues that the water and gas industry is. . concerned about, such as power consumption and coverage.Putting two topical technologies together will inevitably make people in the circle compare them together.
In terms of power consumption, whether it is NB-IOT or LoRa, they are designed to meet the requirements of the meter with low power consumption, and both have a 10-year lifespan, but the specific details have not yet been explained in detail. .
In terms of the cost of the module, it is understood that the NB-IOT chip will cost about US$2, while the LoRa will not be higher than US$5. The later maintenance is both easy, so it is a little bit on the existing basis. The modification will still be based on a new charging method that has not yet been specified.
In terms of security, NB-IOT technology can reach a carrier-grade security index, using 3GPP authorized spectrum to avoid interference problems. While LoRa uses a multi-layer encryption method, ISM unlicensed spectrum, there will be interference problems.
In terms of sensitivity and accuracy, the link budget of the two technologies is above 155dB, which is completely fine for accuracy and sensitivity. (In order to effectively compare the performance of the transmission range between different technologies, a quantitative indicator called "link budget" is used. The link budget includes every variable that affects the signal strength of the receiving end. In its simplified system, it includes transmit power plus Receiver sensitivity).
In terms of coverage (signal), NB-IOT<25km and LoRa<11km are slightly inferior to LoRa. NB-IOT can be sent repeatedly when the signal is bad.
For the installation environment of meters, NB-IOT technology has been successfully implemented in the water meter industry, and LoRa is also possible in the face of harsh environments.
In terms of network deployment, LoRa is currently a bit embarrassing, and a strong hand is needed to promote its network construction, and NB-IOT can be based on LTE FDD or GSM upgrades or new builds. The view of the Internet as an important sales channel or information disseminator is too narrow.He said: "The emergence of the Internet is like the invention of fire, water or electricity. It allows humans to make things that have never existed before. This is the basic element of the world." Everything is more or less Connected to the Internet to some extent. The integration of many factors such as technology, economy and society has created the "primordial soup" of the Internet of Things, laying the foundation for the Internet of Things to become everything in the future. Everything is the Internet of Things. No technology can completely occupy the market. NB-IoT will promote the development of the entire industry. To some extent, NB-IoT and LoRa belong to two camps.Because NB-IoT mainly relies on the operator's infrastructure for protocol docking, LoRa is a more flexible autonomous network that can be deployed wherever it is needed. Both of them are complementary and coexisting in the IoT market.
|Create Date : 06 สิงหาคม 2564
|Last Update : 6 สิงหาคม 2564 15:40:04 น.
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