9 Identities

03.693GPPStage 2TSVoice Broadcast Service (VBS)

9.1 Elementary identities for broadcast calls

a) Group ID

The group ID is a sequence of decimal digits with a maximum value depending on the composition of the broadcast call reference defined under c). The length of Group ID shall be in a range of 1 to 6 digits.

The mobile station derives the group ID from the broadcast call reference by identifying the longest group ID amongst those stored in the SIM and matching the least significant digits of the broadcast call reference. If no group ID is stored in the SIM that matches the least significant digits of the broadcast call reference, the mobile station is not able to derive the group ID from the broadcast call reference.

NOTE 1: The network should use Group IDs matching an initial part of other group IDs with greatest care, if at all.

EXAMPLE: A mobile station storing the group IDs 678, 2 678 and 42 678 (and only those) in the SIM will derive group ID 2 678 from group call reference 13 452 678.

For definition of Group ID on the radio interface, A interface and Abis interface, see 3GPP TS 04.69 [11].

For definition of Group ID coding on MAP protocol interfaces, see 3GPP TS 29.002 [12].

b) Group call area ID

The group call area ID is a sequence of decimal digits uniquely assigned to a group call area in one network and with a maximum value depending on the composition of the broadcast call reference defined under c).

c) Broadcast call reference

Each voice group call in one network is uniquely identified by its broadcast call reference. The broadcast call reference is a concatenated sequence of the group ID (as the least significant part) and the group call area ID (as the most significant part). The broadcast call reference shall have a maximum length of 8 digits. The composition of the group call area ID and the group ID can be specific for each network operator.

Group call area ID

Group ID

For definition of Broadcast Call Reference (with leading zeros inserted as necessary) on the radio interface and A interface and Abis interface, see 3GPP TS 24.008 [7], 3GPP TS 04.18 [13] and 3GPP TS 04.69 [11].

For definition of Broadcast Call Reference coding (also known as ASCI Call Reference, Voice Group Call Reference or Voice Broadcast Call Reference) on MAP protocol interfaces, see 3GPP TS 29.002 [12].

9.2 Use of identities in the network

For each voice broadcast call the identifications as defined in the following shall be used within the network for the related purpose mentioned.

For voice broadcast services which are to operate in more than one PLMN, group identities have to be co-ordinated between the network operators involved.

a) Identities used for GCR requests for service subscriber originated voice broadcast calls

In case of a service subscriber originated call, the identity of the call used by the MSC in which the call is originated to interrogate the GCR shall consist of the originating serving cell identity as defined in 3GPP TS 08.08 and the group ID as defined in subclause 9.1.

Originating cell ID

Group ID

A service subscriber initiating a voice broadcast call has to call the wanted group ID. The MSC in which the call is originated shall accumulate from the BSS the called group ID and the originating cell ID.

If the group call area exceeds one MSC area, the identity used to interrogate the GCR by an MSC in which the call was not originated shall consist of the broadcast call reference as defined in subclause 9.1.

b) Identities used for GCR requests for dispatcher originated voice broadcast calls

In case of dispatcher originated call the identity used by the MSC to interrogate the GCR shall consist of the broadcast call references defined in subclause 9.1.

c) Identities used for notifications

Identities used for notification messages shall consist of the broadcast call reference as defined in subclause 9.

d) Identities used by dispatchers for voice broadcast call establishment

For dispatcher originated calls an MSISDN is dialled. The Country Code (CC) and National Destination Code (NDC) are used as normal for routing purposes. The numbering scheme is according to CCITT Recommendation E.164. The Subscriber Number (SN) is used to indicate:

– the request of a broadcast call by use of a prefix. The length of the prefix shall be 1 to 2 digits [tbc]; FFS

– the wanted broadcast call reference as defined in subclause 9.1.

CC

NDC

Prefix

Broadcast call reference

e) Identities used for VLR requests for service subscriber originated broadcast calls

The group ID shall be used on the B-Interface for VLR requests.

f) Anchor MSC address for routing of service subscriber originated calls from Relay MSC to anchor MSC

For service subscriber located in Relay MSCs originated calls an anchor MSC address is used as called party address to route the call to the anchor MSC. The anchor MSC address structure is the same as for dispatcher originated calls (see subclause d)) The Country Code (CC) and National Destination Code (NDC) are used as normal for routing purposes. The numbering scheme is according to CCITT Recommendation E.164. The Subscriber Number (SN) is used to indicate:

– the request of a group call by use of a prefix. The length of the prefix shall be 1 to 2 digits; the actual value of the prefix may be different than the one dialled by dispatchers.

– the wanted group call reference as defined in subclause 9.1.

CC

NDC

Prefix

Group call reference