Catching and understanding gsmsignals institute for computing. Types of channels used in gsm and there discription. Logical channels it transports either user data during a call or signalling information for ms or base station. Gsm etsi 650 route des lucioles f06921 sophia antipolis cedex france.
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. Click on document introduction to gsm physical channels logical channels network and operation lawrence harte. Mapping in frequency of logical channels onto physical channels. Introduction to gsm physical channels logical, author. Broadcast control channel, carry cgi,mnc,mcc which is received by ms. In the gsm system, the logical channel is classified as the dedicated channel dch and the common channel cch. Introduction to wcdma, physical channels, logical channels, network, and operation lawrence harte. Introduction to wcdma physical channels logic by kari. Channel combinations only certain combinations of logical channels are permitted according to the gsm recommendations. In gsm the mobiles, when active in the network, are attached to the network which is typically.
The cross reference between gsm, umts, 3gpp and etsi identities can be found under. Numbers appearing in brackets after channel designations indicate sub channel numbers. Every gsm gprs physical channels are mapped to one of these burst types and the mapping is described below. Followings are the types of burst being used in gsm gprs. In this way, the physical channels are mapped as different logical channels.
In the western world most gsm traffic is encrypted using an. Gsm, gprs, edge, channel allocation, tdma, time slot. Gsm logical channels free download as powerpoint presentation. The information and format of the individual burst. For example, on one of the physical channels used for traffic, the traffic itself is transmitted using a traffic channel tch message, while a handover instruction is transmitted using a fast associated control channel facch message. The figure below shows the way in which logical channels can be combined on to basic physical channels bpc.
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