12 Content of messages

03.693GPPStage 2TSVoice Broadcast Service (VBS)

This clause specifies the content of the following messages:

On the B interface (MSC-VLR):

– Allocate Group Call Number;

– Allocate Group Call Number ack;

– Allocate Group Call Number negative response;

– Release Group Call Number;

On the E interface (MSC-MSC):

– Prepare Group Call;

– Prepare Group Call ack;

– Prepare Group Call negative response;

– Send Group Call End Signal;

On the I interface (MSC-GCR):

– GCR Interrogation;

– GCR Interrogation ack;

– GCR Interrogation negative response;

– Call Released.

In the tables which follow, information elements are shown as mandatory (M), conditional (C) or optional (O). A mandatory information element shall always be present. A conditional information element shall be present if certain conditions are fulfilled; if those conditions are not fulfilled it shall be absent. An optional element may be present or absent, at the discretion of the application at the sending entity.

12.1 Messages on the B interface (MSC-VLR)

12.1.1 Allocate Group Call Number

No information element is required.

12.1.2 Allocate Group Call Number ack

The following information element is required:

Information element name

Required

Description

Group Call number

M

E.164 number required to route the call from the anchor MSC to the relay MSC

12.1.3 Allocate Group Call Number negative response

The negative response information element can takes the following value:

– No Group Call number available

12.1.4 Release Group Call Number

The following information element is required:

Information element name

Required

Description

Group Call number

M

E.164 number required to route the call from the anchor MSC to the relay MSC

12.2 Messages on the E interface (MSC-MSC)

12.2.1 Prepare Group Call

The following information elements are required:

Information element name

Required

Description

Teleservice

M

The teleservice Voice Broadcast Call indicates that a VBS call has to be prepared.

Broadcast call reference

M

see clause 9

Ciphering Algorithm, Group Key and Number

M

information on the cipher algorithm and group key to be used.

Priority

C

The default priority level must be present if eMLPP applies.

Codec Info

M

Information on the codecs allowed for the VBS call

12.2.2 Prepare Group Call ack

The following information element is required:

Information element name

Required

Description

Group Call number

M

E.164 number required to route the call from the anchor MSC to the relay MSC

12.2.3 Prepare Group Call negative response

The negative response information element can takes the following value:

– No Group Call number available

12.2.4 Send Group Call End Signal

No information element is required.

12.3 Messages on the I interface (MSC-GCR)

12.3.1 GCR Interrogation

The following information elements are required:

Information element name

Required

Description

Broadcast call reference

C

see clause 9. Must be present if the VBS call was initiated by a dispatcher or by a service subscriber in the relay MSC area and the receiving GCR is associated to the anchor MSC.

Group ID

C

see clause 9. Must be present if the VBS call was initiated by a service subscriber in the own MSC area.

Originating Cell ID

C

see clause 9. Must be present if the VBS call was initiated by a service subscriber in the own MSC area.

CLI

C

Calling Line Identity of the initiating dispatcher, or VBS prefix plus broadcast call reference in case of service subscriber originated VBS call in the relay MSC. Must be present if the VBS call was not initiated by a service subscriber located in the own MSC area.

Relay MSC indicator

M

A flag indicating whether the GCR interrogation was triggered from a Prepare Group Call message received from the anchor MSC.

12.3.2 GCR Interrogation ack

The following information elements are required:

Information element name

Required

Description

Cell List

C

A list of cells inside the MSC area into which the call is to be sent. Must be present if a) no anchor MSC address is present in the broadcast call reference record, or b) the relay MSC indicator was set in the GCR Interrogation message.

Anchor MSC Address

C

E.164 number required to route the call from the relay MSC to the anchor MSC. Must be present if the anchor MSC Address is present in the broadcast call reference record.

Relay MSC List

C

A list of relay MSCs into which the call is to be sent. Must be present if a relay MSC list is present in the broadcast call reference record

Group Key and Number

C

Information on the cipher algorithm and the group key to be used. Must be present if Group Key and Number is present in the broadcast call reference record

Codec Info

C

Information on the codecs allowed for the voice broadcast call. Must be present if Codec Info is present in the broadcast call reference record.

Establish to Dispatcher List

C

A list of identities of dispatchers to which a dedicated link is to be established. Must be present if included in the broadcast call reference record. Note that the CLI possibly received with the GCR interrogation message must not be included.

Release from Dispatcher List

C

A list of identities of dispatchers which are allowed to terminate the voice broadcast call. Must be present if included in the broadcast call reference record.

Priority

C

The default priority level related to the voice broadcast call if eMLPP applies. Must be present if included in the broadcast call reference record.

12.3.3 GCR interrogation negative response

The negative response information element can takes the following value:

– on-going call

– failure

12.3.4 Call released

The following information element is required:

Information element name

Required

Description

Broadcast call reference

M

see clause 9.

Annex A (informative):
Change history

Status
of
Technical Specification GSM 03.69: stage 2 VBS

Date

Version

Remarks

No Phase 1 version

January 1995

4.0.0

TS approved by SMG#13

October 1995

5.0.0

Change requests approved by SMG#16:
CR 03.69‑001 (category D)
CR 03.69‑002 (category C)
CR 03.69‑003 (category C)
CR 03.69‑003 (category C)
CR 03.69‑004 (category C)

April 1996

5.1.0

Change request approved by SMG#18:
CR 03.69-A005 (category C)

December 1996

5.1.1

GTS converted to ETS 300

February 1997

5.2.0

Change request approved by SMG#21:
CR 03.69-A006 r1 (category C)

May 1997

5.1.2

ETS 300 934 first edition (version 5.2.0 already exists because of CR approved by SMG#21 in February 1997)

August 1997

5.2.1

ETS 300 934 second edition

November 1997

5.3.0

Change request approved by SMG#23
CR 03.69-A009 (category F)

December 1997

5.4.0

Change request approved by SMG#24:
CR 03.69-A010 ((category B) (ASCI Phase 2 Release 97)

March 1998

6.0.0

TS converted to version 6.0.0 because of Release 97 issue

July 1998

6.1.0

Change request approved by SMG#26
CR 03.69-A012 (cat A: correction of Release 96) (ASCI Phase 1)
Specification published as TS 100 939

August 1999

7.0.0

Specification version upgrade to Release 1998 version 7.0.0

February 2000

8.0.0

Specification version upgrade to Release 1999 version 8.0.0

April 2000

8.1.0

CR approved at TSGN#7 and SMG email approved before SMG#32

CR A015 Data Flow for Fast Call setup

June 2000

8.2.0

CR approved at SMG#32 and CN#8, CR A017 Clarification of anchor MSC address format

TSG
Meet-
ing

TSG Doc
number

TSG WG
doc
number

Spec

CR

Rv

Ph

Cat

Vers
Old

Vers
New

Subject

Workitem

Notes

NP-21

NP-030407

N1-031214

03.69

A027

1

R99

A

8.2.0

8.3.0

Correction to definition of Group-ID, Group call area ID and Group Call Reference

ASCI

NP-25

NP-040373

N1-041528

03.69

A028

1

R99

F

8.3.0

8.4.0

Correction on notification procedures for Originator of VBS call

ASCI

CP-28

CP-050057

C1-050470

03.69

A030

R99

F

8.4.0

8.5.0

Correction on the use of calling subscriber and destination subscriber

ASCI

June 2005