GSM

Basic of GSM Um,Abis and A Interface

GSM (Um) Air Interface This is the interface between the GSM mobile station and the GSM Base station. The Air interface (RF Interface) uses the Time Division
Article Topics :

Basic of GSM Um,Abis and A Interface, Time Division Multiple Access, A interface function, Abis Interface Function, Air Interface basic, GSM Call Flow Basic, INgterface, Connection, LAPD, GSM BTS, BSC and MSC Connection

How 26 and 51 Multiframes in GSM

GSM is very complicated when we talk about its rf side and in it very complicated to understand the structure of 26 and 51 Multiframes, here my
Article Topics :

Why 26 and 51 Multiframes in GSM, channel multiframe, frame, brust, control channel, channel multiframe, timeslot, traffic channel, sacch, multiframe, 51 multiframe, 26 multiframe

How PLMN Selection in GSM

When the mobile is switched on it will select the registered PLMN in the mobile if there exist one. If there is no registered GSM PLMN or
Article Topics :

plmn, GSM PLMN, automatic mode, manual mode, plmn selection, gsm, mobile, priority, network, signal, message

What is Speech Coding

The coding mode is called Regular Pulse Excited-Long Term Prediction (RPE-LTP). It works as follow: 8KHZ of sampling is performed first, then divided into frames with 20ms;
Article Topics :

voice coder, voice, coding, coder, bits

Fade Margin Calculation in GSM

As previously I write about fading effect in GSM here I write about Fade Margin Calculation in GSM. Cell area probability (CAP ) is the percentage of
Article Topics :

fade margin, standard deviation, propagation constant, standard, propagation, margin, deviation, constant, signal

Site Selection Criteria in GSM

Site selection is based on a number of criteria. It may not be possible to satisfy all these criteria at the same time, but it is important
Article Topics :

site selection, drive test, site, tower, antenna, urban, terrain, propagation

Antenna Installation and Downtilting

When we talk about antenna then we need to understand about antenna installation and specially about antenna downtilting.lets assume that antenna installed then how you can change
Article Topics :

downtilt, downtilting, horizon, electrical, mechanical, lobe, cell, antennas, pattern

What is Principle for Frequency Planning in GSM

The actual frequency planning of certain areas is usually conducted with such areas divided into segments geographically, i.e., first divide a complex network into small networks. However,
Article Topics :

frequency planning, frequency hopping, frequency, bts, reuse, planning, hopping, channel

How 1x 3 or 1x1Reuse Patterns in Frequency Planing

Isolated reuse technology refers to 1*3 or 1*1 reuse with short reuse distance and severe interferences, radio frequency hopping technology has to be adopted. The aggregate of
Article Topics :

frequency hopping technology, frequency, carriers, hopping, cell, isolated, frequency hopping, radio frequency

GSM Underlaid Overlaid Frequency Allocation and Configuration

Underlaid OverlaidĀ  Frequency Allocation In the Overlaid/Underlaid technology, all frequency carriers in the cell are divided into two parts, of which the TRX power of some frequency
Article Topics :

overlaid underlaid frequency configuration, overlaid underlaid, frequency carriers, frequency, underlaid, overlaid, carriers, layer, circle, cell

Advantages of Multi layer frequency Reuse Pattern

Capacity increase when reuse density is multiplied: Supposing there are 300 cells Bandwidth: 8 MHz (40 frequency) Normal 4*3 reuse: reuse density=12 Network capacity = 40/12 *
Article Topics :

co channel reuse distance, different frequency carriers, baseband frequency hopping, reuse density, frequency, carriers, layer, density, network, interferences

Multi layer Frequency Reuse Pattern in GSM

Multi-layer reuse pattern technology means to divide the whole frequency resources into different subgroups according to specific principles. Each subgroup allocates frequency carriers to every cell by
Article Topics :

Multi layer Frequency Reuse Pattern, Frequency Reuse, frequency, interference, technology, reuse density receives