What is the NB-IOT Internet of Things smart lock technology standard? What are the technical characteristics of NB-IOT Internet of Things smart lock? NB-IOT smart lock technical parameters explain. Although the application of NB-IOT technology is very extensive, the most eye-catching thing is the dispute of the first Internet of Things smart lock of OFO shared bicycles and Mobike bicycles. Everyone knows that NB-IOT Internet of Things technology is a shared bicycle smart lock. One of the future solutions, but what are its technical characteristics?
NB-IoT, also known as Narrow Band Internet of Things (Narrow Band Internet of Things), is an important branch of the Internet of Everything network. It is built on a mobile cellular network and consumes only about 180 KHz of bandwidth. It can be deployed directly on GSM networks, UMTS networks, or LTE networks. .
Compared with Bluetooth, ZigBee, and other short-range communication technologies, mobile cellular networks have features such as wide coverage, mobility, and large number of connections, which can bring richer application scenarios and a more convenient user experience. NB-IoT has gradually become the Internet of Things. The main connection technology.
The NB-IoT IoT shared bicycle smart lock has three characteristics:
First, the coverage is wider. The NB-IoT signal far exceeds the existing network through the wall. Even if the user is in a deep underground parking lot, he can use the NB-IoT technology to smoothly switch the lock.
Followed by more devices can be connected, NB-IoT technology than 100 times higher than conventional mobile communication network connection capabilities, i.e., the same base station can be connected to more intelligent lock device ofo things, avoid dropping the case;
The third is lower power consumption. The standby time of NB-IoT devices can be used for 2-3 years without the need for charging existing batteries.
The innovation of OFO in the application of Internet of Things will make new technologies rapidly popularized, and it will truly enter the daily mobile internet scene of massive users. Starting from the nature of the Internet of Things, the shared bicycle platform represented by OFO is the best cut-through. Points and foundations mark the real entry into the Internet of Things era of shared bikes.
NB-IOT intelligent lock technical parameter configuration introductionNB-IoT band: NB-IoT uses the band number defined by LTE, and Release 13 specifies 14 bands for NB-IoT.
NB-IoT physical layer detailed parameters:
In order to enable operators to flexibly use LTE frequency bands or non-LTE frequency bands to deploy NB-IoT systems and consider compatibility with LTE systems, the bandwidth of a single carrier is limited to 180 KHz, which is equivalent to a PRB (Physical Resource Block) bandwidth. .
NB-IoT supports three operating modes: In-Band, Guard Band, and Stand-alone. In-Band operation uses PRBs in LTE carriers for data transmission, Guard Band operation uses Guard Bands in LTE carriers for data transmission, and Stand-alone runs uses carriers in non-LTE frequency bands for data transmission. .
In order to improve the market demand of NB-IoT, the design of the three operating modes is consistent, but the two operating modes of In-Band and Guard Band need special consideration to the compatibility of the LTE system. The maximum data rate supported by the NB-IoT is 64 Kbit/s in the uplink and 28 Kbit/s in the downlink.
The NB-IoT uses Multiple Access technology, which is the same as the LTE system, in the multiple access technology selection, that is, using Orthogonal Frequency Division Multiple Access (OFDMA) on the downlink in the uplink. Single Carrier Frequency Division Multiple Access (SC-FDMA) is used, and the subcarrier spacing and frame structure are the same as those of the LTE system.
In addition, taking into account the low-cost requirements of NB-IoT UEs, single-frequency (Single Tone) transmission is also supported in the uplink. In addition to the original 15 kHz, Subcarrier Spacing uses 3.75 kHz Subcarrier Spacing, a total of 48 subcarriers.
Because there is only one PRB at a maximum bandwidth, most of the different physical layer channels are time division multiplexed (Time Division Multiplexed, TDD), that is, they occur at different times. In addition, considering the low cost and low complexity of NB-IoT UEs, Release-13 NB-IoT only supports Frequency Division Duplex (FDD) and is half duplex, that is, uplink and downlink. Different carriers are used, and an NB-IoT UE needs to transmit and receive at different time points.
In NB-IoT, physical uplink control channel (PUCCH), physical hybrid automatic repeat request or indication channel (Physical Hybrid ARQ Indicator Channel) in an LTE system is discarded because of the limitation of the bandwidth size and the capability of the NB-IoT UE. (PhICH) and other physical layer channels.
For existing LTE networks, the above requirements cannot be fully satisfied. Even LTE-A focuses on carrier aggregation, dual connectivity, and D2D and does not consider the Internet of Things.
For example, in coverage, taking the water meter as an example, the wireless environment of the location is poor. Compared with the smart phone, the height difference leads to a signal difference of 4 dB, and at the same time, the lid is overlaid, and an additional loss of about 10 dB is required, so an increase of 20 dB is required.
The above is only the basic parameters of the NB-IOT Internet of Things smart lock technology, more NB-IOT aspects please pay attention to the content of this site!
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