What are the conditions for the use of the mobile satellite communication service?

Satellite mobile communication service (Tiantong-1 domestic satellite 1740 section) is open to practitioners in emergency communications, field operations, field and marine Internet of Things applications, etc., which is based on China's self-developed Tiantong-1 domestic satellite, using a special number for satellite mobile communication (1740 section), through the satellite dedicated network element to achieve voice calls, SMS sending and receiving and data transmission communication services. Applicable customers are suitable for practitioners in emergency communications, field operations, field and marine Internet of Things applications. The application channel can be handled through the business hall.

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The mobile satellite communication service is suitable for practitioners in emergency communications, field operations, field and marine Internet of Things applications.

Satellite mobile communication service (Tiantong-1 domestic satellite 1740 section) is open to practitioners in emergency communications, field operations, field and marine Internet of Things applications, etc., which is based on China's self-developed Tiantong-1 domestic satellite, using a special number for satellite mobile communication (1740 section), through the satellite dedicated network element to achieve voice calls, SMS sending and receiving and data transmission communication services.

1. Satellite mobile communication service is the use of satellites with different orbits of high, medium and low to provide regional and even global mobile communication services, including satellite mobile voice service (voice communication with fixed and mobile operators at home and abroad) and satellite mobile data transmission (data rate up to 492kbit s) services. 2. The business can be widely used in petroleum, ocean, emergency, news reporting, scientific investigation, field survey, tourism and other fields. Tariff standard: The tariff for the mobile satellite communication service consists of a one-time fee, a function fee and a communication fee.

In an integrated system, the geostationary and non-geostationary satellite parts should each support a different operational focus. The main services supported by the geostationary satellite system are:

1. The trunk line connection between the hub stations of the ground public network is huge and the cost is high;

2. Access of remote users (VSAT terminals);

3. Constitute a private network and a connection between the private network and the public network. The main services supported by the non-synchronous satellite system are:

1. Mobile communication services;

2. Provide basic communication (voice and low-speed data) in remote areas and rural areas, and the volume and cost of user terminals are much lower than those of VSAT terminals;

3. It is used for the access of high-speed (up to 2MB s) user terminals, providing interactive multi-** services and supporting Zhiqin users to browse the Internet at high speed. Its user terminal cost and antenna size should be smaller than that of VSAT terminals. In the integrated system, since the asynchronous satellite will fly around the world and have global (non-real-time) coverage, the integrated system can achieve global (non-real-time) data communication (data information delay of up to about 5 hours).

Although the communication is non-real-time, the system is completely controlled by China, which can alleviate the global communication problems that have plagued China to a certain extent, and is of great significance to military and diplomatic confidential communications.

According to the application environment, it can be divided into sea, air and ground, so there are: Maritime Satellite Mobile Communication System (MMSS), Aeronautical Mobile Satellite Communication System (AMSS) and Land Satellite Mobile Communication System (LMSS). According to the satellite orbit adopted by the system, it can be divided into synchronous orbit and non-synchronous orbit satellite communication system.

Non-synchronous orbits can be further divided into high orbit (HEQ), medium orbit (MEO) and low orbit (LEO) systems. According to the orbit position of the satellite, there are geosynchronous satellite (geostationary satellite) mobile communication, earth low orbit satellite mobile communication, earth medium orbit satellite mobile communication and earth high orbit satellite mobile communication. According to the location of mobile users, there are satellite land mobile communications, satellite maritime mobile communications and satellite aeronautical mobile communications.

In addition to the rationality and advancement of market demand and technology, the investment and economic benefits required for the establishment of China's integrated satellite communications system are the key factors determining whether the establishment of the system is feasible.

Our integrated satellite communications system is a regional system that serves our country (and its surrounding areas). In general, the use of geostationary satellites may be a better option, as the system requires less investment and it is not (economically) desirable to use a constellation of satellites in non-geostationary orbits with global coverage to serve a region. However, with the breakthrough of constellation design technology, constellations with a smaller number of non-synchronous orbiting satellites are also an option for regional systems.

As a part of the non-synchronous satellite in China's integrated satellite communication system, it is advisable to adopt the "regional time limit" constellation. The constellation can provide continuous coverage of our country at specific times (usually during the peak hours of daily operations), and the investment required for the space segment can be roughly comparable to that of geostationary satellites. At the same time, the regional constellation of non-synchronous satellites covering our country has even better coverage characteristics (higher elevation angles) for the United States, which is geographically symmetrical with our country (about 180 ° difference in longitude).

Therefore, if the same constellation supports the two regional systems of China and the United States, and the investment in the space segment is shared, then China's non-synchronous satellite system may require more investment than a geostationary satellite system.

The non-synchronous satellite in China's integrated system can be a constellation composed of four elliptical orbit satellites (near and far, with points of 4497km and 16209km respectively), which can continuously cover China at 7 o'clock or 23:30 Beijing time every day. It can be seen that the minimum coverage elevation angle of the constellation to our country is more than 15°, and the vast majority of the continent is above 20°.

During periods of low traffic that cannot be covered by non-synchronous satellites, such as late at night and early in the morning, geostationary satellites can be used to support these smaller volumes. At this time, the geostationary satellites with continuous coverage in China are also in a low-load period, and they have enough resources (such as power) to improve the adverse effects caused by the increase in propagation loss when switching from non-synchronous satellites to synchronous satellites.

Since the early 60s, China began to develop the microwave relay communication system and artificial earth satellites, which indicates that the Chinese people have the ability to rely on their own strength to get involved in the field of satellite communications and add new means of communication to the communication network. By the mid-70s, China already had large-scale earth stations for domestic and international communication services. In the past 20 years, China's satellite communications have made great progress in research, development, manufacturing, launch, operation and other fields, due to the attention of the state and the joint efforts of domestic scientific and technological personnel and management personnel, laying a solid foundation for the next step of development.

It can provide mobile users with global, regional or domestic public mobile**, telex, fax, data services, satellite wireless paging services, satellite radiopositioning services, as well as emergency rescue and disaster relief, secure communications and dispatching communication services for vehicles, ships and aircraft by special departments.

Satellite communication systems have the widest communication range and can provide communication services to users in every corner of the globe. In this system, satellites perform similar functions as base stations. Satellite communication systems can be divided into three types: geostationary orbit, medium orbit and low orbit according to the position of the satellite.

Satellite communication systems have shortcomings such as high cost, large transmission delay, and limited transmission bandwidth.

The above-mentioned mobile communication systems all require the support of wired network communication infrastructure, such as base stations, switches, satellites, etc. The establishment and operation of these facilities requires a lot of manpower and material resources, so the cost is relatively high, and the construction period is also long. The ad hoc network does not need the support of the base station, and the host itself is networked, so the network establishment cost is low, and the time is short, generally only a few seconds or minutes.

In the above-mentioned communication system, the mobile terminals do not communicate directly with each other, and the mobile terminals only have the function of sending and receiving, and do not have the function of **. The ad hoc network is composed of mobile hosts, which can communicate directly with each other, and the mobile hosts not only send and receive data, but also ** data. In addition, the mobile communication system mainly provides users with voice communication functions, usually using circuit switching, and the topology is relatively stable.

The ad hoc network uses packet technology, which mainly provides users with data communication services, and the topology is easy to change.

The mobile satellite communication system covers the whole world, can solve the mobile communication services in sparsely populated and underdeveloped areas, and is an important part of global personal communication. However, it is expensive to serve and cannot replace terrestrial cellular mobile communication systems at present. Satellite Mobile Communication System Mobile Communication Technology.