Global System for Mobile Communications – Railway (GSM-R) is a radio communication system offering a wide range of voice and data services needed for. This group was named “Groupe Spéciale Mobile” and the system name GSM arose. This abbreviation has since been interpreted in other ways. This group was named “Groupe Spéciale Mobile” and the system name GSM arose. This abbreviation has since been interpreted in other ways, but the most.

Author: Meztizil Mezijas
Country: Japan
Language: English (Spanish)
Genre: Literature
Published (Last): 17 August 2013
Pages: 240
PDF File Size: 4.88 Mb
ePub File Size: 16.98 Mb
ISBN: 950-4-21171-725-2
Downloads: 8172
Price: Free* [*Free Regsitration Required]
Uploader: Taujind

This is a major difference when compared to fixed telephone networks, which is why we have to take a closer look at it in the following chapter. Things become more complicated when it becomes ysstra to set up a call.

These functions will be discussed later. These bursts have to arrive at the Base Transceiver Station so that they can map exactly into their allocated time slots.

This process is described below: Speech is also the basic service that each subscriber is guaranteed to. As an example, take a person who has a subscription for two basic services, Speech and Group 3 fax.

It is certainly a paradox that the network should be large enough sufficient coverage and quality and small enough cost efficient at the same time. As the SIM has or it should have exactly the same algorithms as used in the triplet generation on the network side, the Sysstra number that the SIM receives and inserts to the algorithm should produce exactly the same SRES value as the one generated on the network side. The solution used to overcome this problem is called “adaptive frame alignment”.


The receptionist carefully checks the sstra of the professor. Based on this delay value, the Base Transceiver Station informs the mobile station to either advance or retard the time sytra by sending the burst slightly before the actual time sytsra. Initiation of the paging process for a mobile station is done by: By altering the characteristic of a radio signal for every bit in the digital signal, we can “translate” an analogue signal into a bit stream in the frequency domain.

The mobile station makes a request for a channel to establish the connection. If we put the transcoder somewhere else, say just after the MSC, we can not get a significant advantage either. The figure below illustrates the TDMA principle.

SYSTRA Training Document | Muhammad Suleman Khan –

Operator specific 32 bit binary number. By checking the VLR, it recognises the number and so it is able to trace the called subscriber. The document has been prepared to be used by professional and properly trained personnel, and the customer assumes full tsm when using it. The sectorised 2 sectorised and 3 sectorised BTSs have sectorised antennas, which receive and transmit in certain directions. There are four types of handovers: Location registration takes place when a mobile station is syatra on.

If you do not distribute the frequencies properly throughout the network, the result will be a high level of interference caused by overlapping frequencies. We can say that he is using a service provided by the hotel.


B answers Figure Let us make a simplified exercise to illustrate the situation. It monitors the exchange continuously and starts recovery procedures if errors occur.


The Syetra does not analyse the roaming number, because the MSRN is used for traffic transactions only and the HLR does not handle traffic, it is only a database that helps in locating subscribers and co-ordinates call set-up. It is a 32 bit binary number and these TMSI numbers are reallocated in a ciphered format.

We could use commercially available processors and write software for it to execute. The other 6 bits are effectively wasted. When you hang up, a light burns to indicate this and the lady pulls out the plugs.

GSM-Systra – [PDF Document]

The PSTN exchange analyses the dialled number. The passport is also a database – a small one, though – and the receptionist analyses the data recorded in it. However, with the passing of time and the development of newer and more advanced technology, signalling requirements also started to become more stringent and demanding. gsk

Speech encryption is carried out between the BTS and the mobile station. The TMSI is a temporary identity, which regularly gets changed. In other words, by sysfra a sectorised antenna the covered distance increases. The Intratalk is slightly bigger with a height of cm. The SCCP is the signalling connection and control part.