1 Barring of outgoing calls

03.883GPPCall Barring (CB) supplementary servicesStage 2TS

1.1 Handling of barring of outgoing calls

1.1.1 Registration

If the served mobile subscriber at provision time has selected the subscription option "control of barring services by subscriber using password", he has to register a password at provision time. Furthermore the served mobile subscriber can change the password by an appropriate control procedure at any time. The control procedure consists of three steps: first, the old password has to be provided. Secondly, the new password has to be given, after which it has to be verified by providing it once more, see GSM 03.11.

If the served mobile subscriber at provision time has selected the subscription option "control of barring services by the service provider" an attempt to register a password will be denied and the served mobile subscriber should receive a notification.

The subscriber can register a new password, thus causing the previous registration to be overridden, see GSM 03.11.

1.1.2 Activation

1.1.2.1 General

If the served mobile subscriber at provision time has selected the subscription option "control of barring services by subscriber using password" the supplementary service is activated if the subscriber provides the following information to the network:

1) password;

2) information as to whether the activation applies to all basic services or a specific basic service group;

3) selected barring program.

Activation can take place with an appropriate control procedure by the subscriber.

If the served mobile subscriber at provision time has selected the subscription option "control of barring services by the service provider", the supplementary service cannot be activated by the subscriber. The activation has to be performed by the service provider. An attempt to activate the service will be denied and the served mobile subscriber should receive a notification.

If the served mobile subscriber at provision time has selected the subscription option "control of barring services by subscriber using password", and if a wrong password is entered to activate the service the supplementary service will not be activated and the served mobile subscriber is notified.

The information flow for activation of barring of outgoing calls is shown in figure 1.4. For more details see GSM 03.11.

1.1.2.2 Interactions between barring of outgoing call programs

In case the served mobile subscriber activates barring of outgoing international calls except those directed to the home PLMN country and this service is not supported by the PLMN in which the served mobile subscriber currently roams, the VPLMN will activate barring of outgoing international calls instead. The SDL diagram in figure 1.1 shows the function to be performed in the VLR in order to deal with this interaction. This function is performed upon receiving the "insert subscriber data" message from the HLR.

In case the mobile subscriber activates one of the call barring programs and another call barring program was already activated, this program will be deactivated and the requested call barring program will be activated. The SDL diagram in figure 1.2 shows the function to be performed in the HLR in order to deal with this interaction between call barring programs.

1.1.2.3 Interactions with call forwarding supplementary services

For interactions with call forwarding supplementary services see GSM 02.82.

The SDL diagram in figure 1.3 shows the function to be performed in the HLR in order to deal with the interactions with call forwarding supplementary services.

Figure 1.1: BO1 Possible change of barring of outgoing international calls except those directed to the home PLMN country into barring of outgoing international calls

Figure 1.2: BO2 Interaction between call barring programs

Figure 1.3: BO3 Interaction between call forwarding supplementary services and barring of outgoing calls programs

NOTE: BX indicates any of the barring programs. PW1 and PW2 indicate password handling programs, see GSM 03.11.

Figure 1.4: Activation of barring of outgoing calls

1.1.3 Deactivation

The procedure for activation, described in subclause 1.1.2.1, is valid also correspondingly for deactivation with the addition that a barring supplementary service, i.e. the Outgoing barring service, or All barring services can be signalled.

The information flow for deactivation of barring of outgoing calls is shown in figure 1.5. For more details see GSM 03.11.

NOTE: BO indicates the general code for barring of outgoing calls. PW1 and PW2 indicate password handling programs, see GSM 03.11.

Figure 1.5: Deactivation of barring of outgoing calls

1.1.4 Interrogation

The interrogation procedure enables the mobile subscriber to obtain information about the data stored in the PLMN. After having requested this procedure the network shall return a list of all basic services to which the given barring program is active.

The information flow for interrogation of barring of outgoing calls is shown in figure 1.6.

NOTE: BX indicates any of the barring programs.

Figure 1.6: Interrogation of barring of outgoing calls

1.2 Functions and information flows

The following Mobile Additional Functions have been identified:

MAF017

Barring of all outgoing calls related authorizations examination

The ability of a PLMN component to determine the authorizations relating to barring of all outgoing calls. See figure 1.7.

Location: VLR

MAF018

Barring of outgoing international calls related authorizations examination

The ability of a PLMN component to determine the authorizations relating to barring of outgoing international calls. See figure 1.8.

Location: VLR

MAF020

Barring of outgoing international calls except those directed to the home PLMN country related authorizations examination

The ability of a PLMN component to determine the authorizations relating to barring of outgoing international calls except those directed to the home PLMN country. See figure 1.9.

Location: VLR

The information flow for barring of outgoing calls is shown in figure 1.10.

Figure 1.7: MAF017 Barring of all outgoing calls related authorisations examination (VLR)

Figure 1.8: MAF018 Barring of all outgoing international calls related authorisations examination (VLR)

Figure 1.9: MAF020 Barring of outgoing international calls except those directed to the home PLMN country related authorisations examination (VLR)

NOTE: OR1: call barred Y: yes N: no

Figure 1.10: Information flow for barring of outgoing calls

1.3 Information stored in the HLR

For all call barring supplementary services in the HLR must be stored:

– the subscription option "control of barring services" on per subscriber basis.

This subscription option takes one of the following values:

– by subscriber using password;

– by the service provider.

If the subscription option "control of barring services" has been set to "by subscriber using password" for barring of outgoing calls in the HLR must be stored on per subscriber basis:

– the registration parameter "call barring password"

The password is valid for all basic services to which barring of outgoing calls applies;

– the status parameter "wrong password attempts counter" associated with the password.

Note that the subscription option and the call barring password are parameters which are associated with all call barring services.

The outgoing calls barring program may have the following logical states (refer to GSM 03.11 for an explanation of the notation):

Provisioning State

Registration State

Activation State

HLR Induction State

(Not Provisioned,

Not Applicable,

Not Active,

Not Induced)

(Provisioned,

Not Applicable,

Not Active,

Not Induced)

(Provisioned,

Not Applicable,

Active and Operative,

Not Induced)

(Not Provisioned,

Not Applicable,

Not Active,

Induced)

(Provisioned,

Not Applicable,

Not Active,

Induced)

(Provisioned,

Not Applicable,

Active and Operative,

Induced)

The activation and HLR induction states may be different for each applicable elementary basic service group.

The provisioning state shall be on a per subscriber basis, and hence the same for all basic service groups.

The HLR shall also store the logical state of the outgoing calls barring program (which shall be one of the valid states listed above) for each applicable elementary basic service group.

1.4 State transition model

The following figure shows the successful cases of transition between the applicable logical states of the barring of outgoing call program. The state changes are either caused by actions of the service provider, the mobile user or the network.

Note that error cases are not shown in the diagram as they normally do not cause a state change. Additionally, some successful requests may not cause a state change. Hence, they are not shown in diagram.

The diagram only shows operations on an elementary basic service group.

Figure 1.11: State transition model for BAOC, BOIC and BOIC-exHC

1.5 Transfer of information from HLR to VLR

If the provisioning state for the outgoing calls barring program is "Provisioned" then when the subscriber registers on a VLR the HLR shall send that VLR information about the logical state of the program for all relevant elementary basic service groups.

If the HLR induction state for the outgoing calls barring program is "Induced" then when the subscriber registers on a VLR the HLR shall send that VLR information about the logical state of the program for all relevant elementary basic service groups.

If the logical state of the outgoing calls barring program is changed while a subscriber is registered on a VLR then for the affected basic service groups, the HLR shall inform the VLR of the new logical state of the program.

1.6 Information stored in the VLR

For each barring of outgoing calls program the VLR shall store the service state information received from the HLR.

1.7 Handover

Handover will have no impact on the control procedures and the operation of the service.

1.8 Cross Phase compatibility

1.8.1 MS, MSC, VLR or HLR only support Phase 1 control of SS by the subscriber

In response to a Barring of outgoing calls interrogation request, if the MS or any network element involved is of Phase 1, only information concerning basic service groups for which the activation state has the value "Active and Operative" will be returned.

1.8.2 HLR only support Phase 1 updating of subscriber information

If the VLR receives the SS-status parameter from a Phase 1 HLR it shall act as if it has received the SS-Status parameter with the values shown in the following:

1) Activated => P bit = 1, R bit = 0 or 1, A bit = 1, Q bit = 0;

2) Deactivated => P bit = 1, R bit = 0 or 1, A bit = 0, Q bit = 0 or 1.