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About this document
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- 14 pages
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- Computer Science, Electrical Engineering, Telecommunications
This document explains the procedures for establishing mobile calls. It covers the steps and messages involved in call establishment, including handling abnormal cases. It is useful for understanding the technical aspects of mobile communication systems.
What's inside
- Mobile originating call establishment
- Basic call establishment
- Basic call request
- Invalid call information
- Call proceeding
- Interworking notification
Who it is for: Students studying telecommunications, computer science or electrical engineering. (Undergraduate)
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Summary
Call establishment procedures in mobile networks are discussed. The guide explains the steps and messages involved in setting up calls, handling emergencies and dealing with errors.
Mobile originating call establishment
This part covers the steps to start a call from a mobile station. It describes how the mobile station and network connect and the messages they exchange.
Basic call establishment
Basic calls require the mobile station to be registered and cipher mode set. The network and mobile station exchange specific messages to proceed with the call.
Call confirmation indication
The network sends an ALERTING message when the called party is being alerted. The mobile station stops certain timers and enters the 'call delivered' state.
Emergency call establishment
Emergency calls may have specific characteristics. The network might initiate authentication and ciphering procedures for these calls.
Key terms
- MM-connection
- Connection between the Mobility Management sublayers in the mobile station and network.
- SETUP message
- Message sent by the mobile station to initiate a call, containing information needed by the network.
- Timer T303
- Timer used to supervise the MM-connection pending and call initiated states.
- ALERTING message
- Message sent by the network to indicate that the called party is being alerted.
- CALL PROCEEDING message
- Message sent by the network to indicate that the call is proceeding.
- RELEASE COMPLETE message
- Message sent to indicate that the call is being released or cleared.
Questions this document helps with
- How does a mobile station start a call?
- What messages are exchanged during call establishment?
- What happens if a call setup timer expires?
Summary written with AI from the document's text.
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