Mobile communication
The the seamless transfer of the call from one base station to another, as
1 the mobile unit crosses cell boundaries is called Handover
The technique by which the send and receive paths in a mobile
2 communication system are separated over the medium is known as Duplexing
3 Heart of GSM Networks switching sub systems
4 Linear predictive coding- Decrease bit rate Speech compression
5 feature is not belongs to second Generation Mobile Technology Circuit Switched Data (CSD)
6 firstly introduced mobile communication Motorola- Martin cooper-1973
Distributes the coverage of the cell and extends the cell boundary to hard
7 to reach places Micro cell zone concept
8 smaller keypads, Consumes power rapidly, requires big power source Disadvantage of mobile and wireless device
9 GSM -3 security services Temporary identity+Ciphering+Authentication
- 4 multiplexing techniques FDMA+TDMA+CDMA+SDMA
10 GSM, US digital cellular, Pacific Digital Cellular TDMA
11 One way of reducing the level of interference is Use of directional antenna
widely used concept in the cellular system that will increase the capacity
12 of the system or which will help to increase the number of users Frequency reuse
Group of cells in which no frequencies are reused is termed as
13 Cluster
Small Cells and Frequency reuse,
Small Battery powered Handset,
14 one of the following feature best describes a digital cellular system Performance of Handovers
15 The true shape of cell is not a perfect hexagon due to Natural terrain and man-made structures
The cells which are typically used for indoor applications are
16 categorized under Pico cells
17 Urban outdoor, dense pedestrian areas Microcell
18 Rural, highways, general coverage Macro cells
Coverage for high-speed users, will reduce the number of handovers and
19 the work of the network umbrella cells
20 tunnels Selective cells
In a Cellular system the size of the cell is selected according to the
21 Subscriber Density and Demand
IS-95 (Interim Standard 95) is a 2G CDMA (Code Division Multiple
Access) mobile communication standard developed by Qualcomm, also
22 known as: cdmaOne (for IS-95A/IS-95B)
Doesnot use TDMA BPSK with quadrature spreading
23 Universal mobile telecommunication system UMTS
24 Qualcomm code excited linear prediction- in CDMA systems QCELP
25 Base station controller radio
26 Uplink frequency for CDMA 824-849 MHz
27 downlink frequency for CDMA 869-894MHz
28 Uplink frequency for GSM 890-915 MHz
29 downlink frequency for GSM 935-960 MHz
30 IMT-2000 In the year 2000
31 1G Analog Voice - FDMA/FDD AMPS (Advanced Mobile Phone System)-Bell labs-1983
31 2G Digital Voice-CDMA/FDD+ TDMA/FDD SMS,Packet Data- 14.4Kbps
Finland-1991-Radiolinja GSM- Global System for Mobile Communication- call forwarding
GSM uses TDMA,FDMA,FDD- developed by Europe
CDMA IS-Interim standard 95
Personal Digital cellular- PDC
33 2.5G GPRS- General Packet Radio Service -57.6Mbps
HSCSD-High speed circuit switched data
34 2.75G EDGE-Enhanced data rates for GSM evolution
35 3G IMT(international mobile telecommunication)-2000 standard UMTS -Universal mobile telecommunication
2Mbps WCDMA- Wideband code division multiple acess
CDMA2000 -EVDO-Evolution Data Optimized
36 3.5G HSPA- High Speed Packet Access
37 4G 75Mbps LTE (Long Term Evolution)
Wi-Max-Worldwide Interoperability for Microwave Access
38 5G NR (New Radio)
39 All CDMA technologies 2G and 3G Soft hand over
40 SIM-Subscriber identity module stores all user related data
41 2G - GSM
DAMPS Digital advanced mobile phone system
JDC Japaneese digital cellular
42 initiation of mobile calls- FCC Forward control channel
RCC reverse control channel
