GB2308529A - Accessing mobile telephone services - Google Patents

Accessing mobile telephone services Download PDF

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Publication number
GB2308529A
GB2308529A GB9526063A GB9526063A GB2308529A GB 2308529 A GB2308529 A GB 2308529A GB 9526063 A GB9526063 A GB 9526063A GB 9526063 A GB9526063 A GB 9526063A GB 2308529 A GB2308529 A GB 2308529A
Authority
GB
United Kingdom
Prior art keywords
switching centre
mobile
mobile switching
terminal
dialling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9526063A
Other versions
GB9526063D0 (en
Inventor
Iain Sharp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to GB9526063A priority Critical patent/GB2308529A/en
Publication of GB9526063D0 publication Critical patent/GB9526063D0/en
Publication of GB2308529A publication Critical patent/GB2308529A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/4228—Systems providing special services or facilities to subscribers in networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Access to intelligent network services is provided via a mobile switching centre. Each mobile telephone handset can signal digit code information from a keypad to the mobile switching centre to provide number dialling information and to provide access of the terminal to intelligent network services via the mobile switching centre. As signalling from a mobile telephone is not carried out using DTMF tones, dialling signals include a code indicating to the MSC that the signals are dialling codes. The handset has an additional "send data" button whose operation suppresses the conventional StartDTMF message when a number button is subsequently operated. This informs the mobile switching centre that the digit is a service code and is not part of a dialling code.

Description

MOBILE TELEPHONE SERVICES This invention relates to the provision of services to mobile subscribers in a mobile telecommunications system.
Mobile telephone systems, for example the GSM system, were originally developed to provide voice communication to mobile terminals. There are now proposals to introduce a variety of intelligent network (IN) services to mobile network users and there is thus a need to provide a means of access to these services from a mobile terminal. In mobile systems such as the GSM system, access to intelligent network services and to the fixed PSTN network is provided via a mobile switching centre in whose service area the mobile terminal is currently located. There are a number of intelligent network services that, from a fixed network terminal, are requested by the operation of keys on the keypad. In the PSTN, a "switch hook flash" is used before the user enters digits representing services to indicate that those digits are meant for the local exchange. Normally However attempts to apply this technique to mobile terminals have not proved successful. When a key is operated on a mobile terminal, a corresponding signal is relayed over the radio link to the mobile switching centre. The mobile terminal itself has no means of generating DTMF tones, this task being delegated to the mobile switching centre. In response to this signal from the mobile terminal, which is indistinguishable from a conventional dialled digit, the mobile switching centre sends corresponding DTMF tones to the PSTN network.
This occurs before a user selected service definition (USSD) is sent to the network. This is wholly undesirable as the DTMF sequence may trigger other network features or it may annoy users at the far end.
An object of the invention is to minimise or to overcome this disadvantage.
It is a further object of the invention to provide an effective means for accessing intelligent network services from a mobile terminal.
According to one aspect of the invention there is provided a mobile telephone handset or terminal having means for signalling digit code information via a keypad to a mobile switching centre whereby to provide number dialling information and to provide access of the terminal to intelligent network services via the mobile switching centre, there being means for preceding digit code signals representing number dialling information each by a dialling alert signal to the mobile switching centre, and wherein the terminal has means for sending data or command signals entered via the keypad to the mobile switching centre, and means for suppressing said alert signal prior to sending said data or command signals to the mobile switching centre whereby to inhibit generation of number dialling signals representative of those data or command signals by the mobile switching centre.
According to a further aspect of the invention there is provided a mobile telephone system including a plurallity of mobile swiching centres each adapted to serve mobile terminals currently in its service area and providing an interface between those mobile terminals and a public network and an intelligent network, wherein each said mobile terminal has means for signalling digit code information via a keypad to the corresponding mobile switching centre whereby to provide access of the mobile terminal to intelligent network services via the mobile switching centre, said digit code signals being preceded each by a dialling alert signal to the mobile switching centre, and wherein at least some mobile terminals have means for sending data or command signals entered via the keypad to the mobile switching centre, and user operable means for suppressing said alert signal prior to sending said data or command signals to the mobile switching centre.
According to another aspect of the invention there is provided a method of signalling digit code information between a mobile terminal and a mobile switching centre in a mobile telephone network whereby to provide number dialling information and to provide access of the terminal to intelligent network services via the mobile switching centre, the digit code information being entered by keystrokes on a keypad on the mobile terminal, the method including preceding digit code signals representing number dialling information each by a dialling alert signal to the mobile switching centre, and suppressing said alert signal prior to sending said data or command signals to the mobile switching centre whereby to inhibit generation of number dialling signals representative of those data or command signals by the mobile switching centre.
An embodiment of the invention will now be described with reference to the accompanying drawings in which: Figure lis a schematic diagram of a mobile telephone system; and Figure 2 illustrates a messaging protocol between a mobile terminal and a mobile switching centre in the system of figure 1 Referring to the figure 1, the mobile system includes an array of cells 11 each served by a respective base station 12 providing communication with subscriber terminals 10 that are currently located in that cell. A number of base stations are controlled by a base station controller 13 which in turn is coupled to a mobile switching centre (MSC) 14. The MSC incorporates a database or visitors location register (VLR) containing information on the cellular location of those mobile terminals 10 currently in the service area of that MSC. Information on all system mobiles 10 is stored in a central database or home location register (HLR) (not shown) which may be accessed by the MSC to update the VLR whenever a mobile terminal enters the service area of the MSC.
The MSC provides a coupling between the mobile system and fixed networks, e.g. a PSTN whereby calls can be set up to fixed network subscribers, and an intelligent network (AIN) providing access to services. Access to some of these services from mobile terminals is provided by user entry of digit sequences via the keypad which, in addition to the conventional 0 to 9, * and # keys has a further "send data" key.
Referring now to figure 2, this illustrates the messaging protocol between a mobile terminal (MS) and the mobile switching centre (MSC) corresponding to the entry of number dialling codes and service codes via the mobile terminal keypad.
When a 'dialling' keypad button, i.e. one of the 0 to 9 buttons or the * or # button is the first button to be operated, this sends a StartDTMF message to the mobile switching centre indicating to the mobile switching centre that the corresponding digit represents a digit of a number dialling code. The mobile switching centre returns an acknowledgement message, StartDTMFAck to the mobile and sends a DTMF tone set representative of the depressed button, e.g. the button corresponding to the digit 5, to the PSTN. When the button is then released, the mobile sends a StopDTMF message to the mobile switching centre which, in response, stops the DTMF transmission and returns an acknowledgement message StopDTMFAck to the mobile confirming tha DTMF transmisssion has ceased.
When the subscriber requires a service, he operates the additional "send data" button followed by a number button, e.g. the 5 button, indicative of the particular intelligent network service required. This causes the mobile to send a USS~Req("S") message to the mobile switching centre.
In response to this message, the mobile switching centre accesses the corresponding service and returns an acknowledgement message USS~ReqAck to the mobile.
The user operaton of the "send data" button to prevent the mobile terminal sending StartDTMF mesages to the mobile switching centre can be used prior to operation of a single number button, or it can be used to delimit the start of a USSD digit string. The mobile terminal may be arranged to remove the suppression of the StartDTMF message either on a time-out basis following operation of the "send data" button, or the suppression may be removed by a second operation of the button. The button operation may be programmed into a speed dial memory to provide access to a service as part of a speed dialled call.

Claims (7)

CLAIMS:
1. A mobile telephone handset or terminal having means for signalling digit code information via a keypad to a mobile switching centre whereby to provide access of the terminal to intelligent network services via the mobile switching centre, said digit code signals being preceded each by a dialling alert signal to the mobile switching centre, wherein the terminal has means for sending data or command signals entered via the keypad to the mobile switching centre, and user operable means for suppressing said alert signal prior to sending said data or command signals to the mobile switching centre.
2. A mobile telephone handset as claimed in claim 1, and including a speed diai memory having means for incorporating said alert signal suppression as part of a stored digit string
3. A mobile telephone handset or terminal as described herein with reference to and as shown in the accompanying drawings.
4. A mobile telephone system including a plurallity of mobile swiching centres each adapted to serve mobile terminals or handsets currently in its service area and providing an interface between those mobile telephone handsets and a public network and an intelligent network, wherein each said mobile telephone handset has means for signalling digit code information via a keypad to the corresponding mobile switching centre whereby to provide access of the handset to intelligent network services via the mobile switching centre, said digit code signals being preceded each by a dialling alert signal to the mobile switching centre, and wherein at least some handsets have means for sending data or command signals entered via the keypad to the mobile switching centre, and user operable means for suppressing said alert signal prior to sending said data or command signals to the mobile switching centre.
5. A mobile telephone system substantially as described herein with reference to and as shown in the accompanying drawings.
6. A method of signalling digit code information between a mobile terminal and a mobile switching centre in a mobile telephone network whereby to provide number dialling information and to provide access of the terminal to intelligent network services via the mobile switching centre, the digit code information being entered by keystrokes on a keypad on the mobile terminal, the method including preceding digit code signals representing number dialling information each by a dialling alert signal to the mobile switching centre, and suppressing said alert signal prior to sending said data or command signals to the mobile switching centre whereby to inhibit generation of number dialling signals representative of those data or command signals by the mobile switching centre.
7. A method of signalling digit code information between a mobile terminal and a mobile switching centre in a mobile telephone network substantially as described herein with reference to and as shown in the accompanying drawings.
GB9526063A 1995-12-20 1995-12-20 Accessing mobile telephone services Withdrawn GB2308529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9526063A GB2308529A (en) 1995-12-20 1995-12-20 Accessing mobile telephone services

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9526063A GB2308529A (en) 1995-12-20 1995-12-20 Accessing mobile telephone services

Publications (2)

Publication Number Publication Date
GB9526063D0 GB9526063D0 (en) 1996-02-21
GB2308529A true GB2308529A (en) 1997-06-25

Family

ID=10785759

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9526063A Withdrawn GB2308529A (en) 1995-12-20 1995-12-20 Accessing mobile telephone services

Country Status (1)

Country Link
GB (1) GB2308529A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000056092A1 (en) * 1999-03-16 2000-09-21 Ericsson, Inc. System and method for supporting dtmf tone sending in an ip based gsm network

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007008A1 (en) * 1993-09-03 1995-03-09 Telefonaktiebolaget Lm Ericsson A method and system for providing supplementary services to a mobile station

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995007008A1 (en) * 1993-09-03 1995-03-09 Telefonaktiebolaget Lm Ericsson A method and system for providing supplementary services to a mobile station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000056092A1 (en) * 1999-03-16 2000-09-21 Ericsson, Inc. System and method for supporting dtmf tone sending in an ip based gsm network
US6487209B1 (en) 1999-03-16 2002-11-26 Ericsson Inc. System and method for supporting DTMF tone sending in an IP based GSM network

Also Published As

Publication number Publication date
GB9526063D0 (en) 1996-02-21

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)