Tài liệu Điện thoại di động mạng lưới Radio P4 pptx
Tài liệu Điện thoại di động mạng lưới Radio P4 pptx
... a comparison of the technical parameters for the radio
interfaces of the digital public mobile radio systems (GSM, USDC and PDC).
4.2 The US Digital Cellular System (USDC) 305
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Figure ... (MPT) made the decision in April
1989 to develop a digital mobile radio standard. Compared with exis...
Tài liệu Điện thoại di động mạng lưới Radio P3 pptx
... Subsystem
Radio Subsystem
O (see below)
Points of reference:
Interface to
Transition to
Interface
Radio Interface
other Networks
Figure 3.1: Functional architecture of the GSM mobile radio network
3.2 ... propagation of
the radio waves in its equalizer.
In the GSM frequency band, shadowing may happen to the radio signals
of mobile and base stations; this is partly compensated by t...
Tài liệu Điện thoại di động mạng lưới Radio P10 pptx
... IS-95
• Digital cordless radio networks:
– DECT
– Personal Handyphone System, PHS (Japan)
– US Personal Access Communication System (PACS)
• Digital point-to-multipoint (PMP) radio relay systems
Directional ... re-
stricted area, e.g., in a radio cell defined by an internal base station. Systems
in which users enjoy the same kind of mobility as in cellular mobile radio
Mobile Radio N...
Tài liệu Điện thoại di động mạng lưới Radio P1 doc
... Radio
TETRA digital
Satellite Radio
Broadband Radio
Cellular Radio
Data Packet Radio
Trunked Radio
Paging Systems
Telephony
Cordless
1974: Private
MPT 1327Mobile Radio
D-Netz digital
1998: Iridium
Figure ... digital
1992: Data Radio
Modacom
INMARSAT-C
1988:
LEO Satellite Sys.
W-ATM
2000:1997:1996:
W-LAN 802.11 HIPERLAN/1
2002: UMTS
1991: DECT
digital
1991: Trunked Radio
anal...
Tài liệu Điện thoại di động mạng lưới Radio P2 doc
... cell radii shown. According to Appendix A.1.2, the
2.6 Allocation of Radio Channels 65
B
Code
Time
User 1
User 2
User 3
User 4
Frequency
t
f
Figure 2.36: Code-division multiplexing, CDM
are di erent ... of a medium. The following techniques are used
in radio systems:
• Frequency-division multiplexing (FDM)
• Time-division multiplexing (TDM)
• Code-division multiplexing (CDM)
• Space-divi...
Tài liệu Điện thoại di động mạng lưới Radio P5 ppt
... Virtual
Working
Unit
Inter
Protocols
Radio B-ISDN
Access
Transcoding
Functions
Radio Connection
Figure 5.14: Use of virtual ATM connections with UMTS-specific protocols for the
radio interface
offer a defined ... to integrate worldwide the di erent mobile communications systems
available today, such as mobile telephone and telepoint, trunked radio, data
radio, and satellite radio syst...
Tài liệu Điện thoại di động mạng lưới Radio P6 ppt
... to any
mobile station and is used for sending broadcast and dummy messages.
370 6 Trunked Mobile Radio and Packet Data Radio
Licence type C Trunked radio networks for local, geographically tightly ... tightly re-
stricted areas.
Licence type D Countrywide trunked radio network for mobile data radio
applications.
Trunked radio networks are divided into two categories based on user...
Tài liệu Điện thoại di động mạng lưới Radio P7 pdf
... eight di erent tone
signals per Radio Identity Code (RIC). This means that a tone receiver
with a RIC can produce eight di erent alarm signals.
• Numeric radio paging in which the receiver has a display ... caller first dials the paging number and then the suffix number
of the radio paging area in which the call is to be transmitted.
In addition to terminals and accessories for Cityruf,...
Tài liệu Điện thoại di động mạng lưới Radio P8 ppt
... first ever mobile radio system in which the base station
as well as the mobile terminal transmit on the same radio channel. Yet the
two transmission directions are not separated by di erent frequencies; ... Cordless Telephone Systems
and 868 MHz, which, unlike CT1, does not collide with other standardized
mobile radio services in Europe.
Two-level GFSK (Gaussian Frequency Shift Keying)...
Tài liệu Điện thoại di động mạng lưới Radio P9 pdf
... Portable
Application
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
Portable
Radio
Termin.
D4
D4 ... D4
D4
D4
D4 D4
Global Network
Local Network Local Network
Fixed
Radio
Termination
Fixed
Radio
Termination
Fixed
Radio
Termination
Fixed
Radio...