You have to understand at least the structure of slot, frame, multiframe (Do you remember where the multiframe is located in overall GSM frame structure?. This page on GSM tutorial covers GSM frame structure including concept of slot, frame,multiframe,superframe and hyperframe. It covers both 51 frame multiframe . Global System for Mobile (GSM) Several providers can setup mobile networks following the GSM .. Control Channel Multiframe (Reverse link for TS0). 0. F. 1.

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The GSM frame structure establishes schedules for the predetermined use of timeslots. Broadcast technology Embedded Design principles Distribution Formulae. These consist of 51 traffic multiframes or 26 control multiframes.

Don’t just look at these diagrams if you are GSM beginner, draw grids on a paper or open up a Excel spreadsheet and color and label it on your own. You will see a better way to visualize this structure at later section, for now just try to get some ‘sense feeling ‘ of how a multiframe looks like.

The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. GSM multiframe The GSM frames are grouped together to form multiframes and in this way it is possible to establish a time schedule for their operation and the network can be synchronised.

GSM Frame Structure

They should also multjframe mapping of different channels to time slots in these gsm frame structures. Each Mkltiframe superframe composed of multiframes either 26 or 51 as described below. This lasts for approximately 4.


As shown in multiframee 3. All the remaining frame are allocated for Traffic. Superframe – A superframe is a multiframe sequence that combines the period of a 51 multiframe with 26 multiframes 6. At the center of the frame traffic channel multiframe i. A few important features of the burst is stated below. You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia systems.

This is like normal burst but has no meaning of its payload bits. Above muktiframe superframes i. Then follows, in timeslot 0 of frames 10 and 11, a repeat of the frequency and synchronising bursts F and Sfour further CCCH bursts C and so on. During network entry each GSM mobile phone is allocated one slot in downlink and one slot in uplink. This division of frequency pool is called FDMA.

The illustration below is for Downlink multiframe structure. Hyperframe – A hyperframe is a multiframe sequence that is composed of superframes, and is the largest time interval in the GSM system 3 hours, 28 minutes, 53 seconds.

Why 26 and 51 Multiframes in GSM frame structure frame traffic frame control four repetitions of timeslot bursts traffic channel multiframe control channel multiframe type of control channel multiframe. This example shows 2 users using full rate voice traffic channels. This channel makes a mobile station time-synchronized with the base station clock.

As shown in the figure 2 below, there are two varients to multiframe structure. Eight of these burst periods are grouped into what is known as a TDMA frame. I strongly recommend you to go through these tutorials at least once and then this page can be a good cheat sheet to remind your memory and solidify your understanding.


This book explains the basic components, technologies used, and operation of GSM systems. Only one training sequence is defined for this burst. Within the GSM hyperframe there is a counter and multiftame time slot has a unique sequential number comprising the frame number and time slot number. At the last frame is 1 idle frame.

GSM Tutorial | Frame Structure

You have to understand at least the structure of slot, frame, multiframe structure in very detail. Engineers working in GSM should know gsm frame structure for both the downlink as well as uplink. Always occur at beacon frequency in time slot 0, it may also take up other time slots if required by system for example 2,4,6. The GSM allows a cell radius up to of 35 km. Each of those different channel tend to have its own physical or transport layer structure. As I keep telling you, the overall GSM frame structure one cycle is so long in time domain and I haven’t see any material showing even a single multiframe at the full details of each slot.

GSM frame structure | GSM Tutorial

The minimum unit being frame or TDMA frame is made of 8 time slots. A hyperframe has the longest time period in the GSM system of 3 hours, 28 minutes, and 53 seconds.

This is explained below in TDMA gsm frame structure. The length of the guard band in the access burst