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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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It covers both 51 frame multiframe and 26 frame multiframe structure of GSM. As I keep telling you, the multifframe 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

Engineers working in Ggsm should know gsm frame structure for both the downlink as well as uplink. The 51 frame control multiframe is sub divided into logical channels that include the frequency correction burst, the synchronization burst, the broadcast channel BCCHthe paging and access grant channel PAGCHand the stand-alone dedicated control channel SDCCH.

Accordingly the channel structure is organised into two different types of frame, one for the traffic on the main traffic carrier frequency, and the other for the control on the beacon frequency. Following is the common example of a Traffic Multiframe.

Power management RF technology Test Wireless. One of those frequency channels is defined as the base-frequency beacon frequency or BCCH frequency. This figure shows the different types of GSM frame and multiframe structures. These logical channels are time sheduled by Multiframme. Slot Allocation in Communication. As the traffic multiframes are 26 bursts long and the control multifrae are 51 bursts long, the different number of traffic and control multiframes within the superframe, brings them back into line again taking exactly the same interval.

That is why the synchronization training sequence is very large for this burst comparing to other burst types. Let’s refresh our memory.


GSM Timeslot & Frequency Specifications

Introduction to GSM, 2nd ed. Remaining part of the frequency channel Slot-1 to 7 can be used as any mix of traffic and control channels.

At the center of the frame traffic channel multiframe i.

This example shows 2 users using full rate voice traffic channels. Frame structure is the division of defined length of digital information into different fields information parts.

Now each RF carrier myltiframe have eight time slots. 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.

I strongly recommend you to go through these tutorials at least once and then this page can be a good cheat gam to remind your memory and solidify your understanding. The duration of a frame traffic channel multiframe is ms 26 TDMA frames. This structure may be transmitted on any timeslot.

GSM Frame Structure

That is the flag is 0 for TCH and 1 for others. Every time slot during a hyperframe has a sequential number represented by an 11 bit counter that is composed of a frame number and a time slot number. This is like normal burst but has no meaning of its payload bits. This channel makes a mobile station time-synchronized with the base station clock. The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. By Andrew Morgan at April 02, The first time-slot Slot-0 of the base-frequency TDMA is used as the base-control channel or beacon channel.

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As you see, the minimum unit is a slot and 8 slots slot 0 to 7 makes one step bigger multjframe called a frame. One gzm worth noticing would be the first slot in each frame seems to be used as some control channel. 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.

All of sudden a clear pattern within a multiframe start showing up. A GSM frame is 4. Following is one example showing a control multiframe. As shown in the multifrmae 2 below, there are two varients to multiframe structure. In simplified terms the base station transmits two types of channel, namely traffic and control. In this example, the multifrxme users shares the slot 2 of every frame in alternating fashion.


A few important features of the burst gsn stated below. However, one common thing about all control channel frame structure is that it is based on 51 multiframe.

Don’t just look at these diagrams if you are Multlframe beginner, draw grids on a paper or open up a Excel spreadsheet and color and label it on your own. One of the main reason for this confusion is that even a single cycle of a whole structure requires so many slots and frames, it is really hard to visualize the whole frame structure on a limited space of a sheet of paper or on a white mkltiframe. Newer Post Older Post Home. GSM multiframe The GSM frames multigrame grouped together to form multiframes and in this way it is possible to establish a time schedule for their operation and the multuframe can be synchronised.

One user uses the slot mutliframe at every frame and the other user use the slot 4 at every frame. This helps avoid need of simultaneous transmission and reception by GSM mobile phone. Do you remember where the multiframe is located in overall GSM frame structure? Each GSM superframe composed of multiframes either 26 or 51 as described below.

The GSM frame structure provides the basis for the various physical channels used within GSM, and accordingly it is at the heart of the overall system. When a radio channel is used to provide a control channel, time slot 0 and the other time slots are used for traffic channels.

Wednesday, 2 April Structure of Multi-Frame. Mix of traffic and control channels depends on number of frequency channels per BTS that is the capacity of a cell and the traffic patterns.