We are now in an era of the Internet of Things, and physical network technology is developing rapidly. With the rapid development of the Internet of Things, wireless communication technology needs to be developed further. Nowadays, many low-power wide area networks (LPWAN) designed for IoT applications with low bandwidth, low energy consumption, long distance, and a large number of connections have emerged. Among them, LoRa technology stands out and is recognized by the Internet of Things community.
In August 2013, Semtech officially released to the industry a new type of chip using ultra-long range low-power data transmission technology (Long Range, LoRa) below 1 GHz. 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 distances and robustness to 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.
As the most promising low-power wide-area communication technology, LoRa has been used in all walks of life. LoRa uses chirp spread spectrum modulation technology to maintain low power consumption while significantly increasing the communication distance and network efficiency, and eliminates interference, so that even if the same frequency is used for simultaneous transmission, there will be no mutual interference. The gateway developed on the basis of LoRa can receive and process data from multiple nodes in parallel, expanding the system capacity.
The LoRa data transmission terminal IOT-L2S-B is a universal communication interactive device designed and manufactured based on LoRa radio frequency chips on the basis of many years of professional development and production of power meters by Heyuan Intelligent. The product integrates two industrial standard RS485, transmits the data that the wired device needs to transmit to the device through the RS485 communication line, and then transmits the data wirelessly, supports multiple protocols, and realizes the data between wired and wireless devices transmission. This product can be widely used in the Internet of Things, centralized meter reading, industrial control and other directions.
LoRa has been widely used in various IoT industries due to its low cost, wide distribution, strong durability, and mature technology. Its excellent performance and flexible networking form are increasingly used in various industries. The prospects are broad. The LoRa data transmission terminal IOT-L2S-B is a universal communication interactive device designed and manufactured based on LoRa radio frequency chips, which can be widely used in the Internet of Things, centralized meter reading, industrial control and other directions. And its QoS is not high, the data transmission volume is small, in order to save costs, a large number of connections, and the QoS requirements are not high, LoRa is undoubtedly the best choice. The delay characteristics make it organically complementary to NB-IoT in some industries.
Development status
LoRa Allianceâ„¢, a global enterprise association supporting LoRaWANâ„¢, an open standard for low-power wide-area networks for the Internet of Things, joined hands with 16 alliance members to exhibit at the LoRa Alliance booth. As an open non-profit organization, the LoRa Alliance has become one of the largest and fastest-growing alliances in the technical field since its establishment in 2015. Alliance members work closely together and share experience to promote LoRaWAN as a leading open global standard and achieve a secure, carrier-class Internet of Things LPWAN connection. Due to the technical flexibility to solve a wide range of IoT applications, including static and mobile devices, and certification procedures to ensure interoperability, the LoRaWAN protocol has been deployed by major mobile network operators around the world and can be connected in more than 100 countries , And continue to expand.
Currently, there are 83 operators (LoRa), and the world's LoRa network covers more than 100 countries. These include networks used privately by telecom operators, network operators and private independent organizations. The network has covered the United States, Canada, Brazil, China, Russia, India, Malaysia, Singapore and other regions. In China, we see major vertical markets, such as smart cities, smart homes, and smart agriculture. With Laura Fire Intelligent Technology, many vertical solutions have been put on the market to provide customers.
Ali support, LoRa application accelerates landing
In March of this year, Ali announced its full entry into the Internet of Things track and expanded its layout in specific areas such as cloud, management, edge, and end. On the pipeline side, Wang Yunci, Marketing Director of Alibaba Cloud’s IoT Business Unit, introduced: Alibaba Cloud’s strengths are in cloud computing and the entire infrastructure platform. Alibaba Cloud is not a semiconductor manufacturer or a hardware manufacturer, and it is not good at a single point. Do a lot of vertical application development on the application. The Alibaba Cloud Link WAN core IoT core network management platform developed by Alibaba Cloud based on its own advantages can well support the LoRa protocol.
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