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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Each frame composed of 8 time slots. Eight slot GSM frame structure. Each of those different channel tend to have its own physical or transport layer structure.

Multiframes are frames that are grouped or linked together to perform specific functions. Multiframes on the GSM system use established schedules for specific purposes, such as coordinating with frequency hopping patterns.

You would have seen hsm kind of diagram from various sources.

Do you remember where the multiframe is located in overall GSM frame structure? This lasts for approximately 4.

GSM Timeslot and Frequency Specifications – RF Cafe

The 3 slot time period is gzm by the Mobile subscriber to perform various functions e. Superframes are the composition of 26 control multiframes or 51 traffic multiframes to provide a common time period of 6.

As we can see in the diagram below, each of the control channel types are present on a single timeslot. That is the flag is 0 for TCH and 1 for others.

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As shown in fig 3. The minimum unit being frame or TDMA frame is made of 8 time slots. 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 try to make you understand simply.

The downlink and uplink channels are staggered in order to give the mobile time to process the received message and formulate a response. These logical channels are time sheduled by BTS.

GSM Timeslot & Frequency Specifications

This type of multiframe is divided into logical channels. The GSM frame structure establishes schedules for the predetermined use of timeslots. The basic GSM frame defines the structure upon which all the timing and structure of the GSM messaging and signalling is based.

Engineers working in GSM should know gsm frame structure for both the downlink as multifram as uplink. Newer Post Older Post Home. During network entry each GSM mobile phone is allocated one slot in downlink and one slot in uplink. 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 board.

At the last frame is 1 idle frame. This diagram shows that a single GSM frame is composed of 8 time slots.

GSM Frame Structure

Here each RF carrier frequency is shared between 8 users hence in GSM system, the basic radio resource is a time slot with duration of about microsec. This example shows 2 users using full rate voice traffic channels. X Like My Work Follow. The last frame Frame 50 is allocated for Idle.


All of sudden a clear pattern within a multiframe start showing up. Following illustration shows the time domain structure in slot level. This book explains the basic components, technologies used, and operation of GSM systems. In GSM as well, we have many different types of physical and logical channels and each of these channel types are using its own physical structure at the level of a slot Burst. One thing worth noticing would be the first slot in each frame seems to be used as some control channel.

That is, an RACH message from an MS at a distance of up to 35 km from the base station can reach to the base station antenna without overlapping the next burst. The 12th frame no. During voice communication, one user is typically assigned to each time slot within a frame. Power management RF technology Test Wireless.

GSM frame structure | GSM Tutorial

This channel makes a mobile station time-synchronized with the base station clock. Eight of these burst periods mutliframe grouped into what is known as a TDMA frame. At the last frame is 1 idle frame. Each GSM multiframe composed of frames either 51 or 26 based on multiframe type. Following is one example showing a control multiframe.

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.