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 illustration below is for Downlink multiframe structure.

Superframes are the composition of 26 control multiframes or 51 traffic multiframes to provide a common time period of 6. 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. The basic element in the GSM frame structure is the frame itself.

Each GSM superframe composed of multiframes either 26 or 51 as described below. During voice communication, one user is typically assigned to each time slot within a frame. The fundamental unit of time is called a burst period and it lasts for approximately 0.

GSM Timeslot & Frequency Specifications

Here in the figure GSM Mobile is allocated 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 mlutiframe own. Multiframes are frames that are grouped or linked together to perform specific functions. That is, an RACH message from an MS at a distance of up to 35 km from the base station can gdm to the base station antenna without overlapping the next burst.

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Traffic Multiframe Structures – The 26 traffic multiframe structure is used to send information on the traffic channel. One of those frequency channels is defined as the base-frequency beacon frequency or BCCH frequency. Do you remember where the multiframe is located in overall GSM frame structure? 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.

The illustration below is for Downlink multiframe structure. One user uses the slot 2 at every frame and the other user use the slot 4 at every frame. You will see a better way to visualize this structure multifram later section, for now just try to get some ‘sense feeling ‘ of how a multiframe looks like.

Structure of Each types of Burst.

GSM Tutorial | Frame Structure

Following is the common example of a Traffic Multiframe. Introduction to GSM, 2nd ed. Following is the most basic scheduling for fundamental channels.

All of sudden a clear pattern within a multiframe start showing up. The GSM allows a cell radius up to of 35 km. Sometimes you would notice what we did in the kindergarden still works very well when you are at the age when you have your own kindergarden kids -: Engineers working in GSM should know gsm frame structure for both the downlink as well as uplink. Remaining part of the frequency channel Slot-1 to 7 can be used as any mix of traffic and control channels.


The idle time period allows a mobile device to perform other necessary operations such as monitoring the radio signal strength level of a beacon channel from other cells. Let’s refresh our memory. Frame structure is the division of defined length of digital information into different fields information parts.

This example shows 2 users using full rate voice traffic channels.

This is explained below in TDMA gsm frame structure. This page on GSM tutorial covers GSM frame structure including concept of slot, frame, multiframe, superframe and hyperframe. The use of multifrqme superframe time period allows all mobile devices to scan all the different time frame types at least once.

One GSM hyperframe composed of superframes. The 3 slot time period is used by the Mobile subscriber to perform various functions e. X Like My Work Follow. All the remaining frame are allocated for Traffic.