NB-IOT IOT as a new technology, Chinese manufacturers and international companies are in the same starting line, in Section .CT-UNITE wireless division team over a long period in the smart city pilot products industry roots in low-power networking technology Research and launched the NB-IOT second-generation chip module industry ultra-low power consumption solution, the long-term work energy consumption is only 60% of the same industry and similar products.
CT-M201 Ultra Low Power NB-IoT Second Generation Chip Module
1. Chip side: Select the base station distance and adjust TX POWER through software intelligent management
a. The energy consumed by the device is related to the amount of data or rate. The size of the data packets sent in a unit time determines the power consumption. Zhongke. The CTUNITE team developed intelligent algorithm software for TX POWER based on the distance and signal strength of the base station For management, the software management mechanism includes (fixed reporting, fixed control, mobile reporting, mobile control), which facilitates terminal deployment in different environments, further reducing power consumption in application scenarios and extending battery life;
b. CT-M201 carries wireless network parameters when reporting. The parameters include, but are not limited to, reference signal received power, signal-to-interference plus noise ratio, physical cell identity, physical cell identity, and cell location information. Data is analyzed by cloud platform middleware According to different position, signal strength and other status information, group management is performed and report control commands are issued to assist in intelligent management of 1 ~ 12 subcarriers, reduce excess bandwidth, and 5bits at 15kHz subcarrier interval for effective resource allocation and transmission. Effective transmission management in multiple Stand-alone / Guard band modes to reduce power consumption.
2. Optimize network transmission performance and reduce retransmission mechanism through Zhongke.CTUNITE middleware lightweight cloud platform
After NB uploads the data to the middleware, it stores the data in the Redis cache or the message queue MQ, and the middleware tries to push it to each SaaS platform (relevant application platform). If the application platform returns successfully, the data is removed from the middleware cache or message queue. If the application platform fails or returns nothing, the data enters the retransmission queue of the middleware platform, and the retransmission queue is responsible for retransmission until the transmission is successful or the discard condition is met. The middleware is responsible for retransmission combined with the module's internal power management algorithm. Based on the actual transmission packet size, intelligent transmission allocation of 1 ~ 12 subcarriers is selected to reduce the power consumption of the NB device, reduce the power consumption of the NB device, and extend the use. The purpose of time.
3.Antenna end: Zhongke.CTUNITE radio laboratory adapts to smart antennas in different scenarios
Everyone should be familiar with the term antenna. As a wireless terminal product, antenna technology is the most important link, and it is fatal to terminal products in the field of low power consumption. If the antenna design cannot effectively match the module output power and impedance, the antenna Protons cannot effectively transmit electromagnetic energy to mobile base stations with low loss, so the transmitted data will be severely lost, and at this time, the transmitter of the terminal device will continuously activate the retransmission mechanism. Take NB-IOT as an example: every time the transmitter current is 200mAh, then your battery will be exhausted in a short time.
In order to reduce the problem of infinite retransmission of equipment, the CT.UNITE radio laboratory of Zhongke has customized polarized antennas for different installation environments for customers. Contains (elliptical polarization, horizontal polarization, vertical polarization, left-handed circular polarization, right-handed circularization, etc.).
NB-IOT has not been fully popularized since its commercial use in 2017. Most of the reasons are that people do not pay enough attention to NB-IOT to solve technical problems in product applications through various customized technologies in actual application scenarios to improve product transmission performance , Leading to the failure of some smart city terminal products related to smart hardware. Most of the reasons are transmission delay, packet loss, and unable to quickly establish a connection with the cloud. .
The design standards of NB-IOT technology itself are low latency, high sensitivity, and large-scale access. In order to reduce the power consumption of NB-IOT and improve product sensitivity, people usually only accept the static state index of the product when checking the quality of the product. There is no customized technical solution to improve the product's own problems through practical application scenarios.
We measure whether the product meets the requirements of low-power design. It is not only measured by the chip static index test standards, but also researches various low-power customized technical solutions through actual application scenarios to reduce power consumption and improve product performance.
With the help of various intelligent software and hardware algorithms + smart antenna cooperation solutions, the CT-M201 module effectively solves the pain points of low-power technology in smart city construction and terminal products.
This product accepts OEM production. Our company's current maximum production capacity can reach 200,000 pcs / day. For more information, please visit the official website of China Science and Technology Co., Ltd. https://www.ctunite.com.