In 2017, in the process of narrow-band IoT, LoRa network and NB-IoT network presented the situation in the world. The layout of China and South Korea reflects this trend. LoRa has many partners in enterprise-level custom solutions, and NB-IoT's appeal among operators is clearly greater.
On July 5, according to foreign media reports, Samsung recently announced on its website to cooperate with SK Telecom to deploy the world's first commercial Internet of Things (IoT) dedicated LoRaWAN network. The network will be deployed using the 900 MHz band. The related business service plan was first launched in August in Daegu, the fourth largest city in Korea.
On May 29, China Telecom took the lead in building an Internet of Things network consisting of 310,000 NB-IoTs. In July, the world's first NB-IoT tariff package was officially released. The pricing model of this package is to charge the connection service fee, which reflects the connection value. On August 29, after China Telecom issued the tariff policy, Shenzhen Telecom announced the first 6,000-unit NB-IoT smart gas meter. According to the plan, 6,000 smart gas meters will be installed and commissioned in early September, and will be delivered to residents in October. At that time, China Telecom will become the first operator in China to launch NB-IoT commercial services.
Figure 1: Dr. Yang Liu, Director of Business Development, SEMTECH
On August 16th, at the 2017 China International Internet of Things and Wisdom China Summit held in Shenzhen, Dr. Yang Liu from SEMTECH's Business Development Director gave a speech on “LoRa Global Business Opportunity and Competitiveness Analysis†and shared the LoRa network deployment. Three major advantages, the latest development of the LORA ecological chain.
Three advantages of LoRa technology
IoT applications need to consider many factors, such as node cost, network cost, battery life, data transfer rate (throughput rate), latency, mobility, network coverage, and deployment type. It can be said that no technology can meet all the needs of IoT. Both NB-IoT and LoRa technologies have different technical and commercial characteristics.
Dr. Yang Liu said that the LoRa network has its own unique advantages in terms of network cost, data transmission rate, node cost and deployment.
In August 2013, Semtech released a new chip based on the Long Range (LoRa) technology below 1GHz. Its acceptance sensitivity has reached an astonishing -148dbm, and the highest reception sensitivity has been improved by more than 20db compared to other advanced sub-GHz chips in the industry, which ensures network connection reliability.
LoRa technology is simply a kind of spread spectrum technology. With simple spread spectrum technology, the transmission rate and transmission distance can be greatly increased, the transmission power is significantly reduced, and the battery life is 10-20 years.
LoRa uses linear frequency modulation 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, ie, different spread spectrum. The sequenced terminals do not interfere with each other even if they use the same frequency for simultaneous transmission. Therefore, the Concentrator/Gateway developed on this basis can receive and process data of multiple nodes in parallel, greatly expanding the system capacity.
Why can LoRa transmissions achieve long distances? The LoRa sensitivity is -148dBm and the link budget is 168dB. Dr. Yang Liu said: "The actual measurement we made with the Cisco router was first placed at San Jose Cisco, and it was able to go to San Francisco Airport. The transmission distance was greater than 30 without blocking. Miles (50 km), characterized by: low power consumption, 2 microamps in sleep state, 2 mA in standby state, less than 10 mA in reception, 30 mA at 14 dB when transmitting, 20 dB is The 120 mAh battery is very power efficient.
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