Call set-up control with automatic recall if busy subscriber

Details Call set-up control with automatic recall if busy subscriber Call set-up control with automatic recall if busy subscriber

1999-03-25

2004-05-04

Tran, Sinh (Department: 2681)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S564000, C455S414100

Reexamination Certificate

active

06731937

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a control apparatus and a control method for controlling the set-up of calls between a first subscriber station and a second subscriber station which are connected to a telecommunication network. The invention also relates to a telecommunication system and a subscriber station comprising such a control apparatus.
Specifically the invention relates to telecommunication systems comprising a telecommunication network in which a CCBS (Completion Of Calls To Busy Subscriber) facility allows a calling subscriber station, which failed to set-up a call to a busy subscriber station, to be notified when the called busy subscriber station becomes idle again. When the notification takes place, the network offers automatic set-up (completion) of the call to the called subscriber station. Such a CCBS facility is used to take away the burden of successive re-dialing operations of the calling subscriber station to find out when the concerned second subscriber station becomes available again.
Without being limited thereto the present invention-relates to the usage of the CCBS facility in order to set-up data calls between a first and second subscriber station. However, the invention is also applicable to the setting up of speech calls between the subscriber stations.
Although the standardization for the CCBS facility is currently on the way within the ETSI standardizing committees in view of the GSM telecommunication system (Global System of Mobile Communication) for standardizing the set-up of speech calls between subscriber stations using such a CCBS facility, the invention is not limited to GSM and is likewise applicable to any telecommunication system where call set-up requests need to be transferred through a telecommunication network to a subscriber station.
The CCBS supplementary service has been already standardized by ETSI for a fixed network N-ISDN. It may be noted that it is possible that the CCBS system of GSM and the CCBS system of the fixed network N-ISDN cooperate. For example, one terminal can be a N-ISDN terminal connected to the fixed N-ISDN network and another terminal can be a GSM mobile station.
BACKGROUND OF THE INVENTION
FIG. 6
shows an overview of a telecommunication system
SYS
including a telecommunication network NET and a plurality of subscriber stations
SS
1
,
SS
2
,
SS
3
. The telecommunication network NET comprises an exchange means GMSC, MSC/VLR (A), MSC/VLR (B), HLR (A), HLR (B) for setting up calls between the subscriber stations and an operation state monitoring means CCBS, MON monitoring a respective operation state of the subscriber stations. Of course the network PLMN comprises other features (not shown) necessary for the operation of the network, for example the BSS (i.e. the GSM radio access network) including BSCs (i.e. base station controllers) and the BSs (i.e. the base stations). The BSS is provided between the mobile station MS and the mobile switching center MSC of the network PLMN. Although the BSS is not essential for operating the CCBS service, the CCBS service is exactly provided for the reason to save radio resources within the BSS which is the unit where resources will be occupied by the calls.
Although the operation state monitoring means CCBS, MON is illustrated as being incorporated in the telecommunication network NET, it may be located elsewhere in the telecommunication system, for example within the subscriber station itself or within an exchange means of other telecommunication-networks NET′ which may be connected to the telecommunication network NET. Within the present specification the operation state monitoring means CCBS, MON is for simplicity assumed to be located in the telecommunication network NET. The main function of the operation state monitoring means CCBS, MON is to provide a simple notification mechanism which informs a calling subscriber station that a destination (another subscriber station) previously being busy has become idle.
In
FIG. 6
an example is illustrated where the telecommunication network NET is constituted by a public land mobile radio communication network PLMN and the subscriber stations are mobile stations MS (A), MS (B), MS (C). In this case the exchange means comprises (in addition to other means like the BSS explained above) mobile switching centres MSC, visitor location registers VLR (A), VLR (B), home location registers HLR (A), HLR (B) and a gateway mobile switching centre GMSC. MSC/VLR (A), HLR (A) and MSC/VLR (B), HLR (B) are respectively provided for the mobile stations MS (A), MS (B) between which a call set-up will be considered below, whilst it should be noted that similar means (not shown) are provided for the third mobile station MS (C).
The dotted line between the public land mobile radio communication network PLMN and the respective mobile-stations MS (A), MS (B), MS (C) indicate the radio interface. Furthermore, although not illustrated in
FIG. 6
, it should be noted that the telecommunication network NET can be constituted by a plurality of networks, for example a public and mobile radio network PLMN and a public switched telephone network PSTN, wherein one or more of the subscriber stations
SS
1
,
SS
2
,
SS
3
may be a telephone of a fixed network.
SET-UP OF DATA CALLS
Although hereinafter with reference to
FIGS. 7
a
,
7
b
the set-up of a call (the usual speech call) between the subscriber stations
SS
1
,
SS
2
, will be considered in view of the usage of the CCBS facility, it should be understood that the telecommunication network NET can also switch data calls which are for example issued by a subscriber station.
SS
3
which comprises a telephone equipment and a terminal equipment TE interconnected through a terminal-to-modem interface. In case the subscriber station
SS
3
is a mobile station MS (C) the telephone equipment is constituted by the mobile termination MT of type 2 (which means that the TDF (terminal adapter functions) are integrated).
It should be noted that
FIG. 6
(and also
FIG. 1
to be described below) only shows some common configurations of the subscriber stations including a mobile station e.g. consisting of a mobile termination MT and an interconnected terminal equipment TE. Here a mobile station MS can be regarded as the sum of terminal equipments handled by the user which can be either a mobile termination MT of type 0, a mobile termination of type 1 connected to an ISDN terminal, or a non-ISDN terminal connected to a mobile termination of type 2. The GSM standard GSM 04.02 Version 5.0.0: May 1996 defines the most common configurations used at the mobile stations. In the present specification, the term “mobile station” (see e.g. the mobile station MS (C) in
FIG. 6
) comprises all such configurations without limitation.
The terminal equipment TE may be a computer, e.g. a laptop, on which the data application is implemented. The computer is connected to the mobile termination MT through the interface as is shown in FIG.
6
. The data application implemented on the computer may for example be a FAX application, an electronic mail application, a file transfer application, an Internet Access Application, etc. The terminal equipment TE requests the mobile termination MT to issue a data call dependent on the implemented or executed data application. In. GSM such data-calls are typically transparent or non-transparent circuit-switched connections of a certain data rate which support the said-FAX, electronic mail, file transfer or Internet Access Applications. Depending on the functionalities of the mobile station and of the exchange of the telecommunication network NET, the data calls may in the future also be packet-orientated, wherein in the telecommunication network NET, PLMN a GPRS (General Packet Radio Service) may be provided.
Regarding the data calls, for a GSM mobile equipment the GSM standard specification 07.07 has standardized the AT command set to be used for setting up data calls. The AT command set is an interface to enable the terminal equipment TE (e.g. a laptop) to control the co

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