The so-called cellular Internet of Things is the development of the combination of cellular mobile communication network + Internet of Things. Nowadays, the cellular mobile communication network has been developed for more than 30 years. The high-speed communication tower has risen everywhere, and it can be seen everywhere. It is much more than the industrial chimney, which symbolizes the brilliant information age.
This project should meet the requirements of the Internet of Things market and business development at the end of 2018, adhere to the principle of “starting from the end, overall planning, and step-by-step implementationâ€, based on the planning site of the LTE FDD target network, while ensuring network quality. Under the premise, the common mode hardware is used to replace the old equipment that is necessary for replacement, and the network operation cost is reduced. The specific construction principles are as follows:
(1) Scientifically planning the base station site to ensure long-term stability of the network structure NB-IoT and future LTE FDD, 5G are all co-frequency networking, GSM is an inter-frequency network, NB-IoT construction can not simply inherit the GSM network structure, Planning must be re-planned. At the same time, in order to ensure the stability of the site structure in the future network evolution, NB-IoT and LTE FDD need to carry out joint planning of the site, so that “site planning is in place and network capability is deployed step by stepâ€, and joint planning should rely on 2/4G. Site development, in principle, no new site selection
(2) Reasonable replacement of 2G old equipment and reduction of network operation cost 1.2G old equipment replacement scale should be strictly controlled within the scope of headquarters approval.
2.2G old equipment replacement should be based on the principle of ensuring the best network quality and overall cost, rational and orderly, on-demand replacement, and preferential replacement of old base stations with high energy consumption and high energy consumption in urban areas, reducing network operation costs.
3.2G old equipment replacement should avoid simple and full replacement, pay attention to input and output, strictly control the replacement ratio, and improve network utilization efficiency.
(3) NB-IoT construction on demand to realize flexible deployment of network capabilities NB-IoT network is deployed flexibly on demand based on LTE FDD planning sites to achieve different network coverage capabilities.
Based on the LTE FDD target network planning site 1:1, NB-IoT can provide 23dB deep coverage capability compared with GSM. Based on the LTE FDD target network planning site 1:2, it can provide 17dB stronger than GSM. Deep coverage capability; based on the LTE FDD target network planning site 1:4, it can provide 11dB deep coverage capability compared to GSM.
(4) Building LTE FDD base stations in rural areas to complete universal telecommunications services
In remote rural areas that have not been covered by 4G networks, LTE FDD 900MHz base stations can be used to complete the construction of rural telecommunications universal services. In principle, it is constructed 1:1 with the existing 900MHz GSM macro base station.
There are three ways to build a cellular Internet of Things (NB-IoT) base station: one is GSM upgrade, the old GSM RRU, the antenna, the new BBU or baseband board, the NB-IoT or LTE FDD software function is enabled; the second is the TD-LTE upgrade. The old TD-LTE baseband board, new RRU, antenna, NB-IoT or LTE FDD software function; third, new way, new BBU and baseband board, RRU, antenna, etc., NB-IoT and LTE FDD software functions.
The GSM upgrade solution has the lowest equipment cost, does not increase the lease cost, and the project implementation is simple, which can achieve rapid deployment, but the GSM independent optimization capability is poor; the new scheme has the highest equipment cost, most of which will increase the lease cost, and the project implementation is more difficult, independent of GSM. Better optimization.
Some equipments on the TD-LTE network can be upgraded to support NB-IoT/LTE FDD through common baseband boards and new RRUs and antennas. If the equipment provided by the manufacturer can pass the collection and evaluation test, it can be used in engineering construction.
It is a kind of electric energy or signal transmission device, which is usually composed of several wires or groups of wires.
Power cord plug is also called power plug. It is used in various fields and countries. Power plug can be roughly divided into conversion power plug, injection power plug and assembly power plug. The general power plug can be used only by connecting the power cord. According to the different purposes of the power plug, the power cord plug can be used at the voltage of 250V, 125V and 36V. According to the different current, it can be used in 16a, 13a, 10a, 5A, 2.5A.
AC-DC Power Cord
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