1. GSM - User Services
Asst.Prof. Rupali Lohar
Dept. of Computer Science & Engineering
B. R. Harne College Of Engineering & Technology, Karav, Post Vangani (W Tal
Ambernath, Mumbai, Maharashtra 421503
2. GSM - User Services
• Telephony services or teleservices
• Data services or bearer services
• Supplementary services
3. Teleservices
• Voice Calls- This includes full-rate speech at 13 kbps and emergency
calls.
• Short Text Messages-Short Messaging Service (SMS) service is a text
messaging service that allows sending and receiving text messages on
your GSM mobile phone.
4.
5. Bearer service
• In telecommunications, Bearer Service or data service is a service that allows
transmission of information signals between network interfaces.
These services give the subscriber the capacity required to transmit appropriate
signals between certain access points, i.e. user network interfaces.
• Between two compatible terminals;
• From an access point of the PLMN to a system including high-level
functions, for example, a server.
6. • GSM is digital voice telephony, based on transmission of the
digitally encoded voice over the radio. The voice service also
includes emergency calls, for which the nearest emergency-service
provider is notified by dialing three digits.
• Data services, with data rates ranging from 2.4 Kbps to 14.4 Kbps.
• Short message service (SMS), which is a bidirectional service for
short alphanumeric (up to 160 bytes) messages.
• Access to a voice message service.
• Fax transmission.
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10. • teleservices cover the full seven layers of the OSI protocol layer model
and are seen at the terminal equipment, while bearer services cover
the lower three layers of the OSI model are seen at the interface
between the network and the terminal equipment.
12. Supplementary Services
• Conferencing : A simultaneous conversation between three or more
subscribers to setup a conference call.
• Call Waiting : This service notifies a mobile subscriber of an incoming call
during a conversation. The subscriber can answer, reject, or ignore the
incoming call.
• Call Hold : This service allows a subscriber to put an incoming call on hold and
resume after a while.
• Call Forwarding : Call Forwarding is used to divert calls from the original
recipient to another number.
• Call Barring : Call Barring is useful to restrict certain types of outgoing calls
such as ISD or stop incoming calls from undesired numbers. Call barring is a
flexible service that enables the subscriber to conditionally bar calls.
