Radio telephone system in which a mobile phone can receive a con

Details Radio telephone system in which a mobile phone can receive a con Radio telephone system in which a mobile phone can receive a con

1997-06-20

1999-11-30

Bost, Dwayne D.

Telecommunications

Radiotelephone system

Special service

455567, H04Q 720

Patent

active

059958251

DESCRIPTION:

BRIEF SUMMARY
The invention is related to a radio telephone system comprising of subscriber devices, especially mobile phones, that function in a radio telephone network. The system has at least one control channel for transferring call control messages between the network and a subscriber device. A call is made up of three consecutive phases: connection establishment, information transfer and connection termination.
In communications terminology, a logical communications connection between two subscribers is usually defined as being made up of three consecutive phases, which are connection establishment, information transfer and connection termination. The physical connection between two subscriber devices is formed by a communications network, which in each case consists of a varying number of centers, exchanges, transmitters, receivers and other components, which not only form an information channel between subscribers, but also take part in controlling the subscriber devices connected to the communications network by utilizing different types of control signals or messages. The communications network and its various components will herein simply be referred to as the network.
In the connection establishment phase a subscriber-activated connection request, which is a control message or a group of control signals that include address and other information, is sent to the network, which creates a physical connection to the receiving subscriber and submits an information channel for use by the subscribers. During the information transfer phase information is transferred from one subscriber to the other via the previously reserved information channel.
The connection is also terminated by an exchange of control signals or messages between the subscribers and the network. The physical connection is usually disconnected by a termination acknowledgement sent by the party initiating the termination.
A radio telephone network is usually made up of several base stations and base station controllers that control them. The subscriber devices defined in the terminology presented above are usually mobile phones. The radio interface between the radio telephone network and a subscriber device is defined by network standards such as NMT, GSM, DCS1800, PCS1900, AMPS and TACS. Radio telephone networks that adhere to these standards are usually regional networks.
In the radio interface of cellular networks defined by the GSM, DCS1800 and PCS1900 specifications, the communications connection defined above is a call, in which the states and changes of state related to the connection establishment, information transfer and connection termination phases are controlled by control messages, called Messages for circuit-switched call control, between the subscriber device and the network. Connection establishment messages are: ALERTING, CALL CONFIRMED, CALL PROCEEDING, CONNECT, CONNECT ACKNOWLEDGE, EMERGENCY SETUP, PROGRESS and SETUP. During the information transfer phase, i.e., while the call is active, MODIFY, MODIFY COMPLETE, MODIFY REJECT, USER INFORMATION messages and Supplementary Services HOLD and RETRIEVE messages can be sent. Connection termination messages are: DISCONNECT, RELEASE and RELEASE COMPLETE. The Supplementary Services, SS, of the interface defined by the specifications also include other control messages, and so do the other special cases that are defined as belonging to the interface, such as FACILITY messages, for example. The definitions of these control messages are extensively presented in chapter 9.3, Messages for circuit-switched call control, pages 249-302 in the publication "GSM Technical Specification 04.08", for example, which publication is included in this application by merit of references to the contents of said messages.
FIG. 1 shows an example of the phases of a GSM, DCS1800 or PCS1900 specification call with the help of a state diagram. In the example in FIG. 1, the connection establishment phase is mobile originated, MO. States of the connection setup phase 12 are U0.1 (MM-connection pending), U1.0 (Call i

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