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Anonymous users2024-02-06This kind of system is divided into a number of independent subsystems, each subsystem is a cell, with a communication base station and a mobile station in the area (referring to hand-held mobile ** or laptop computers with communication functions, etc.). A cell is a basic unit, and the network of these basic units is like a honeycomb. Because cellular mobile ** is a two-way communication system (can be dialed out, can also be received**), so the structure is more complex, it can be divided into two parts: local telephone network and cellular network.
The three bureaus of the local telephone office, the mobile communication bureau and the long-distance communication bureau are connected by a large number of large-capacity lines; The equipment between the mobile ** communication office and the base station is also connected by a contact line to control the base station and receive and transmit signals (referred to as the receiving and sending machine); The mobile machine (i.e., Big Brother, or handheld) contains a receiver and transmitter. In this way, it can realize the mutual sending and sending between the handset and the base, that is, using the handset to connect and play. In addition, when the handset enters a different cell, the handset's channel will automatically switch and match the base station of the cell.
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Anonymous users2024-02-05The mobile communication network is called cellular communication reason: cellular network or mobile network (cellular network) is a kind of mobile communication hardware architecture, the mobile service is divided into a regular hexagonal small sub-area, each cell set up a do or leak base station, forming a shape similar to the "cellular" structure, so this mobile communication mode is called pure rotten cellular mobile communication mode. Cellular networks can be further divided into analog cellular networks and digital cellular networks, which are mainly different from the way information is transmitted.
The reason for the widespread adoption of cellular networks stems from the mathematical conclusion that covering the plane with circles of the same radius has the least number of circles when the center of the circle is at the center of each regular hexagon of the regular hexagonal grid, i.e., when the center of the circle is at the grid point of the regular triangular grid.
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Anonymous users2024-02-04The cellular technology employed, of course.
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Anonymous users2024-02-03Typical systems for mobile satellite communications are:
IMARSAT-A, IMARSAT-C, IMARSAT-M, IMARSAT-B, IMARSAT-AIRBORNE, IMARSAT-P, TRITIUM, CELSAT, COMETS, IRIDIUM.
The difference between it and terrestrial cellular mobile communication is that satellite communication is: using satellite relay, mobile communication can be achieved at sea, in the air and in sparsely populated areas with complex terrain, and its coverage is wider.
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Anonymous users2024-02-02Mobile communication systems mainly include cellular systems, trunking systems, adhoc network systems, satellite communication systems, packet wireless networks, cordless systems, radio paging systems, etc.
Basically: cellular system cluster system.
Satellite communication systems.
Adhoc network system.
Wireless communication network.
The most fundamental thing is that satellite communication is a regional communication system, which requires wide coverage, but the capacity is not as large as that of terrestrial land cellular, after all, it is more expensive.
The terrestrial cell system is a cell system, and the coverage of each cell is limited, but the cell capacity, quality and coverage must be higher.
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