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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At the center of the frame traffic channel multiframe i. That is the flag is 0 for TCH and 1 for others. The diagram below shows the frame structure used to multiframr eight SDCCHs, although, as it takes two repetitions of the multiframe to complete the entire sequence, it may be more logical to think of it as a frame structure.

Multiframes on the GSM system use established schedules for specific purposes, such as coordinating with frequency hopping patterns. A multifframe important features of the burst is stated below. Note that the last timeslot 0 in the sequence the fifty-first frame — frame 50 is idle.

You will also discover how 2nd generation systems are gradually evolving into 3rd generation broadband multimedia systems. The 12th frame no. 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 -: This book explains the basic components, technologies used, and operation of GSM systems.


All other frequencies are mostly for traffic but can also be used for control channels. These logical channels are time sheduled by BTS. For that reason, the actual message is relatively short and have a long guard band GB in order to make sure that there will be no overlap with the next burst.

I don’t find any way to visualize the whole Hyper Frame structure showing the details at the level of every single slots, but overal GSM frame hierarchy is as follows. 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. Only one training sequence is defined for this burst.

Why 26 and 51 Multiframes in GSM |

When a radio channel is used to provide a control channel, time slot 0 and the multifrrame time slots are used for traffic channels. X Like My Work Follow. Eight of these burst periods are grouped into what is known as a TDMA frame.

Wednesday, 2 April Structure of Multi-Frame. Structure of Each types of Burst. It covers both 51 frame multiframe and 26 frame multiframe structure of GSM. Superframe – A superframe is a multiframe sequence that combines the period of a 51 multlframe with 26 multiframes 6. The frame structure used for control channels is considerably more complex than the frame structure used for the traffic channels.

By Andrew Morgan at April 02, Following is one example showing a control multiframe. The 51 frame control multiframe is sub mulfiframe 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.


Frame structure is the division of defined length of digital information into different fields information parts. All the remaining frame are allocated for Fsm. You have to understand at least the structure of slot, frame, multiframe structure in very detail. One thing worth noticing would be the first slot in each frame seems to be used as some control channel. GSM Frame Structure – GSM frame structure uses slots, frames, multiframes, superframes and hyperframes to give the required structure and timing to the data transmitted.

This division time wise is called TDMA. Eight slot GSM frame structure. Mix of traffic and control channels depends on number of frequency channels per Multifrrame that is the capacity of a cell and the traffic patterns.

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

GSM Timeslot & Frequency Specifications

All of sudden a clear pattern within a multiframe start showing up. One user uses the slot 2 at sgm frame and the other user use the slot 4 at every frame. The 3 slot time period is used by the Mobile subscriber to perform various functions e. Remaining part of the frequency channel Slot-1 to 7 can be used as any mix of traffic and control channels.