15 Off-network message formats
24.3793GPPMission Critical Push To Talk (MCPTT) call controlProtocol specificationRelease 18TS
15.1 MONP message functional definitions and contents
15.1.1 General
The following clauses describe the MONP message functional definitions and contents. Each message consist of a series of information elements. Annex I describes the standard format of a MONP message and the encoding rules for each type of information element.
15.1.2 GROUP CALL PROBE message
15.1.2.1 Message definition
This message is sent by the UE to other UEs to check for an ongoing group call. For contents of the message see Table 15.1.2.1-1.
Message type: GROUP CALL PROBE
Direction: UE to other UEs
Table 15.1.2.1-1: GROUP CALL PROBE message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call probe message identity |
Message type |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
15.1.3 GROUP CALL ANNOUNCEMENT message
15.1.3.1 Message definition
This message is sent by the UE to other UEs to announce an ongoing group call to other UEs. For contents of the message see Table 15.1.3.1-1.
Message type: GROUP CALL ANNOUNCEMENT
Direction: UE to other UEs
Table 15.1.3.1-1: GROUP CALL ANNOUNCEMENT message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call announcement message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
Call type |
Call type 15.2.11 |
M |
V |
1 |
|
|
Refresh interval |
Refresh interval |
M |
V |
2 |
|
|
Call start time |
Call start time |
M |
V |
5 |
|
|
Last call type change time |
Last call type change time 15.2.15 |
M |
V |
5 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
SDP |
SDP |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
Last user to change call type |
MCPTT User ID |
M |
LV-E |
3-x |
|
|
80 |
Confirm mode indication |
Confirm mode indication |
O |
T |
1 |
|
81 |
Probe response |
Probe response 15.2.16 |
O |
T |
1 |
15.1.4 GROUP CALL ACCEPT message
15.1.4.1 Message definition
This message is sent by the UE to other UEs to indicate acceptance of a group call. For contents of the message see Table 15.1.4.1-1.
Message type: GROUP CALL ACCEPT
Direction: UE to other UEs
Table 15.1.4.1-1: GROUP CALL ACCEPT message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call accept message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
Call type |
Call type 15.2.11 |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Sending MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.5 PRIVATE CALL SETUP REQUEST message
15.1.5.1 Message definition
This message is sent by a UE to another UE to request setup of a private call. For contents of the message see Table 15.1.5.1-1.
Message type: PRIVATE CALL SETUP REQUEST
Direction: UE to another UE
Table 15.1.5.1-1: PRIVATE CALL SETUP REQUEST message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call setup request message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
Commencement mode |
Commencement mode |
M |
V |
1 |
|
|
Call type |
Call type 15.2.11 |
M |
V |
1 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
SDP offer |
SDP |
M |
LV-E |
3-x |
|
|
78 |
User location |
User location 15.2.12 |
O |
TLV-E |
4-x |
15.1.6 PRIVATE CALL RINGING message
15.1.6.1 Message definition
This message is automatically sent by a UE to another UE in response to a PRIVATE CALL SETUP REQUEST message. This message indicates that the UE has presented the incoming call notification to the user and is awaiting user response. For contents of the message see Table 15.1.6.1-1.
Message type: PRIVATE CALL RINGING
Direction: UE to another UE
Table 15.1.6.1-1: PRIVATE CALL RINGING message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call ringing message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.7 PRIVATE CALL ACCEPT message
15.1.7.1 Message definition
This message is sent by a UE to another UE in response to a PRIVATE CALL SETUP REQUEST message when user accepts the call. This message indicates that the UE accepts the call setup request. For contents of the message see Table 15.1.7.1-1.
Message type: PRIVATE CALL ACCEPT
Direction: UE to another UE
Table 15.1.7.1-1: PRIVATE CALL ACCEPT message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call accept message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
SDP answer |
SDP |
M |
LV-E |
3-x |
15.1.8 PRIVATE CALL REJECT message
15.1.8.1 Message definition
This message is sent by a UE to another UE in response to a PRIVATE CALL SETUP REQUEST message when user rejects the call. This message indicates that the UE rejects the call setup request. For contents of the message see Table 15.1.8.1-1.
Message type: PRIVATE CALL REJECT
Direction: UE to another UE
Table 15.1.8.1-1: PRIVATE CALL REJECT message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call reject message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
Reason |
Reason |
M |
V |
1 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.9 PRIVATE CALL RELEASE message
15.1.9.1 Message definition
This message is sent by a UE to another UE to terminate an ongoing private call. For contents of the message see Table 15.1.9.1-1.
Message type: PRIVATE CALL RELEASE
Direction: UE to another UE
Table 15.1.9.1-1: PRIVATE CALL RELEASE message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call release message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user id |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user id |
M |
LV-E |
3-x |
15.1.10 PRIVATE CALL RELEASE ACK message
15.1.10.1 Message definition
This message is sent by a UE to another UE in response to a PRIVATE CALL RELEASE message. This message indicates that the UE has terminated the call. For contents of the message see Table 15.1.10.1-1.
Message type: PRIVATE CALL RELEASE ACK
Direction: UE to another UE
Table 15.1.10.1-1: PRIVATE CALL RELEASE ACK message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call release ack message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user id |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.11 PRIVATE CALL ACCEPT ACK message
15.1.11.1 Message definition
This message is sent by a UE to another UE in response to a PRIVATE CALL ACCEPT message. This message acknowledges the receipt of PRIVATE CALL ACCEPT message. For contents of the message see Table 15.1.11.1-1.
Message type: PRIVATE CALL ACCEPT ACK
Direction: UE to another UE
Table 15.1.11.1-1: PRIVATE CALL ACCEPT ACK message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call accept ack message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.12 PRIVATE CALL EMERGENCY CANCEL message
15.1.12.1 Message definition
This message is sent by a UE to another UE to indicate termination of emergency mode in private call. For contents of the message see Table 15.1.12.1-1.
Message type: PRIVATE CALL EMERGENCY CANCEL
Direction: UE to another UE
Table 15.1.12.1-1: PRIVATE CALL EMERGENCY CANCEL message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call emergency cancel message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.13 PRIVATE CALL EMERGENCY CANCEL ACK message
15.1.13.1 Message definition
This message is sent by a UE to another UE to indicate receipt of PRIVATE CALL EMERGENCY CANCEL message. For contents of the message see Table 15.1.13.1-1.
Message type: PRIVATE CALL EMERGENCY CANCEL ACK
Direction: UE to another UE
Table 15.1.13.1-1: PRIVATE CALL EMERGENCY CANCEL ACK message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Private call emergency cancel ack message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier 15.2.3 |
M |
V |
2 |
|
|
MCPTT user ID of the caller |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT user ID of the callee |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.14 GROUP CALL IMMINENT PERIL END message
15.1.14.1 Message definition
This message is sent by the UE to other UEs to indicate termination of imminent peril mode in the group call. For contents of the message see Table 15.1.14.1-1.
Message type: GROUP CALL IMMINENT PERIL END
Direction: UE to other UEs
Table 15.1.14.1-1: GROUP CALL IMMINENT PERIL END message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call imminent peril end message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
Last call type change time |
Last call type change time 15.2.16 |
M |
V |
5 |
|
|
Last user to change call type |
MCPTT User ID |
M |
LV-E |
3-x |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.15 GROUP CALL EMERGENCY END message
15.1.15.1 Message definition
This message is sent by the UE to other UEs to indicate termination of emergency mode in the group call. For contents of the message see Table 15.1.15.1-1.
Message type: GROUP CALL EMERGENCY END
Direction: UE to other UEs
Table 15.1.15.1-1: GROUP CALL EMERGENCY END message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call emergency end message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
Last call type change time |
Last call type change time 15.2.16 |
M |
V |
5 |
|
|
Last user to change call type |
MCPTT User ID |
M |
LV-E |
3-x |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.16 GROUP EMERGENCY ALERT message
15.1.16.1 Message definition
This message is sent by the UE to other UEs to indicate an emergency situation. For contents of the message see Table 15.1.16.1-1.
Message type: GROUP EMERGENCY ALERT
Direction: UE to other UEs
Table 15.1.16.1-1: GROUP EMERGENCY ALERT message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group emergency alert message identity |
Message type |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
Organization name |
Organization name |
M |
LV-E |
3-x |
|
|
78 |
User location |
User location |
O |
TLV-E |
4-x |
15.1.17 GROUP EMERGENCY ALERT ACK message
15.1.17.1 Message definition
This message is sent by the UE to other UEs to indicate receipt of emergency alert. For contents of the message see Table 15.1.17.1-1.
Message type: GROUP EMERGENCY ALERT ACK
Direction: UE to other UEs
Table 15.1.17.1-1: GROUP EMERGENCY ALERT ACK message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group emergency alert ack message identity |
Message type |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
Sending MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.18 GROUP EMERGENCY ALERT CANCEL message
15.1.18.1 Message definition
This message is sent by the UE to other UEs to indicate end of emergency situation. For contents of the message see Table 15.1.18.1-1.
Message type: GROUP EMERGENCY ALERT CANCEL
Direction: UE to other UEs
Table 15.1.18.1-1: GROUP EMERGENCY ALERT CANCEL message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group emergency alert cancel 0message identity |
Message type |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT User ID |
M |
LV-E |
3-x |
|
|
Sending MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.19 GROUP EMERGENCY ALERT CANCEL ACK message
15.1.19.1 Message definition
This message is sent by the UE to other UEs to indicate receipt of emergency alert cancel. For contents of the message see Table 15.1.19.1-1.
Message type: GROUP EMERGENCY ALERT CANCEL ACK
Direction: UE to other UEs
Table 15.1.19.1-1: GROUP EMERGENCY ALERT CANCEL ACK message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group emergency alert cancel ack message identity |
Message type |
M |
V |
1 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT User ID |
M |
LV-E |
3-x |
|
|
Sending MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.20 GROUP CALL BROADCAST message
15.1.20.1 Message definition
This message is sent by the UE to other UEs to announce a broadcast group call to other UEs. For contents of the message see Table 15.1.20.1-1.
Message type: GROUP CALL BROADCAST
Direction: UE to other UEs
Table 15.1.20.1-1: GROUP CALL BROADCAST message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call broadcast message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
Call type |
Call type 15.2.11 |
M |
V |
1 |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
|
|
MCPTT group ID |
Group ID |
M |
LV-E |
3-x |
|
|
SDP |
SDP |
M |
LV-E |
3-x |
15.1.21 GROUP CALL BROADCAST END message
15.1.21.1 Message definition
This message is sent by the UE to other UEs to indicate termination of a broadcast group call. For contents of the message see Table 15.1.21.1-1.
Message type: GROUP CALL BROADCAST END
Direction: UE to other UEs
Table 15.1.21.1-1: GROUP CALL BROADCAST END message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
Group call broadcast end message identity |
Message type |
M |
V |
1 |
|
|
Call identifier |
Call identifier |
M |
V |
2 |
|
|
MCPTT group ID |
MCPTT group ID |
M |
LV-E |
3-x |
|
|
Originating MCPTT user ID |
MCPTT user ID |
M |
LV-E |
3-x |
15.1.22 MCVIDEO MESSAGE CARRIER message
15.1.22.1 Message definition
This message is used to carry an MCVIDEO message.
For contents of the message see Table 15.1.22.1-1.
Message type: MCVIDEO MESSAGE CARRIER
Direction: UE to other UEs
Table 15.1.22.1-1: MCVIDEO MESSAGE CARRIER message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
MCVIDEO MESSAGE CARRIER |
Message type |
M |
V |
1 |
|
|
MCVIDEO message |
MCVIDEO message |
M |
V |
2-x |
15.1.23 MCDATA MESSAGE CARRIER message
15.1.23.1 Message definition
This message is used to carry an MCDATA message.
For contents of the message see Table 15.1.23.1-1.
Message type: MCDATA MESSAGE CARRIER
Direction: UE to other UEs
Table 15.1.23.1-1: MCDATA MESSAGE CARRIER message content
|
IEI |
Information Element |
Type/Reference |
Presence |
Format |
Length |
|
MCDATA MESSAGE CARRIER |
Message type |
M |
V |
1 |
|
|
MCDATA message |
MCDATA message |
M |
V |
2-x |
15.2 General message format and information elements coding
15.2.1 General
The least significant bit of a field is represented by the lowest numbered bit of the highest numbered octet of the field. When the field extends over more than one octet, the order of bit values progressively decreases as the octet number increases.
Figure 15.2.1-1 shows an example of a field where the most significant bit of the field is marked MSB and the least significant bit of the field is marked LSB.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
MSB |
x |
x |
x |
x |
x |
x |
x |
octet 1 |
|
x |
x |
x |
x |
x |
x |
x |
x |
|
|
x |
x |
x |
x |
x |
x |
x |
LSB |
octet N |
Figure 15.2.1-1: Example of bit ordering of a field
Within the protocols defined in the present document, the message consists of the following parts:
a) message type information element; and
b) other information elements, as required.
The organization of a message is illustrated in the example shown in Figure 15.2.1-2.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Message type |
octet 1 |
|||||||
|
octet 2 |
||||||||
|
Other information elements as required |
||||||||
|
octet n |
||||||||
Figure 15.2.1-2: General message organization example
Unless specified otherwise in the message descriptions of clause 15.1, a particular information element shall not be present more than once in a given message.
The sending entity shall set value of a spare bit to zero. The receiving entity shall ignore value of a spare bit
The sending entity shall not set a value of an information element to a reserved value. The receiving entity shall discard message containing an information element set to a reserved value.
15.2.2 Message type
The purpose of the Message type information element is to identify the type of the message.
The value part of the Message type information element is coded as shown in Table 15.2.2-1.
The Message type information element is a type 3 information element with a length of 1 octet.
Table 15.2.2-1: Message types
|
Bits |
|||||||||||||||||||
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||||||||||||
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
GROUP CALL PROBE |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
GROUP CALL ANNOUNCEMENT |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
GROUP CALL ACCEPT |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
GROUP CALL EMERGENCY END |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
GROUP CALL IMMINENT PERIL END |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
GROUP CALL BROADCAST |
|||||||||||
|
0 |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
GROUP CALL BROADCAST END |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
PRIVATE CALL SETUP REQUEST |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
0 |
0 |
1 |
PRIVATE CALL RINGING |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
PRIVATE CALL ACCEPT |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
0 |
1 |
1 |
PRIVATE CALL REJECT |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
PRIVATE CALL RELEASE |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
1 |
0 |
1 |
PRIVATE CALL RELEASE ACK |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
1 |
1 |
0 |
PRIVATE CALL ACCEPT ACK |
|||||||||||
|
0 |
0 |
0 |
0 |
1 |
1 |
1 |
1 |
PRIVATE EMERGENCY CALL CANCEL |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
PRIVATE EMERGENCY CALL CANCEL ACK |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
0 |
0 |
1 |
GROUP EMERGENCY ALERT |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
GROUP EMERGENCY ALERT ACK |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
0 |
1 |
1 |
GROUP EMERGENCY ALERT CANCEL |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
1 |
0 |
0 |
GROUP EMERGENCY ALERT CANCEL ACK |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
1 |
0 |
1 |
MCDATA MESSAGE CARRIER |
|||||||||||
|
0 |
0 |
0 |
1 |
0 |
1 |
1 |
0 |
MCVIDEO MESSAGE CARRIER |
|||||||||||
|
All other values are reserved. |
|||||||||||||||||||
15.2.3 Call identifier
The purpose of the Call identifier information element is to uniquely identify the call.
The Call identifier information element is coded as shown in Figure 15.2.3-1 and Table 15.2.3-1.
The Call identifier information element is a type 3 information element with a length of 2 octets.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Call identifier |
octet 1 |
|||||||
|
octet 2 |
||||||||
Figure 15.2.3-1: Call identifier information element
Table 15.2.3-1: Call identifier information element
|
Call identifier value (octet 1 to 2) The Call identifier contains a number uniquely identifying the call. |
15.2.4 Refresh interval
The refresh interval information identifier is used to indicate the minimum time period between successive periodic messages;
The Refresh interval information element is coded as shown in Figure 15.2.4-1 and Table 15.2.4-1.
The Refresh interval information element is a type 3 information element with a length of 2 octets.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Refresh interval value |
Octet 1 Octet 2 |
|||||||
Figure 15.2.4-1: Refresh interval
Table 15.2.4-1: Refresh interval information element
|
Refresh interval value (octet 1 to 2) The Refresh interval contains a number denoting the minimum time interval (milliseconds) between two successive periodic announcements. |
15.2.5 MCPTT group ID
The MCPTT group ID information element is used to indicate the destination MCPTT group identifier;
The MCPTT group ID information element is coded as shown in Figure 15.2.5-1 and Table 15.2.5-1.
The MCPTT group ID information element is a type 6 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Length of MCPTT group ID contents |
octet 1 |
|||||||
|
octet 2 |
||||||||
|
octet 3 |
||||||||
|
MCPTT group ID contents |
||||||||
|
octet n |
||||||||
Figure 15.2.5-1: MCPTT group ID information element
Table 15.2.5-1: MCPTT group ID information element
|
MCPTT group ID is contained in octet 3 to octet n; Max value of 65535 octets. |
15.2.6 SDP
The purpose of the SDP information element is to contain SDP message.
The SDP information element is coded as shown in Figure 15.2.6-1 and Table 15.2.6-1.
The SDP information element is a type 6 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Length of SDP contents |
octet 1 |
|||||||
|
octet 2 |
||||||||
|
octet 3 |
||||||||
|
SDP contents |
||||||||
|
octet n |
||||||||
Figure 15.2.6-1: SDP information element
Table 15.2.6-1: SDP information element
|
SDP message container contents (octet 3 to octet n); Max value of 65535 octets. |
|
This information element contains SDP message as defined in Section 10.2.1.1.2 or 11.2.1.1.2. |
15.2.7 Commencement mode
The purpose of the Commencement mode information element is to identify the type of the commencement mode of the private call.
The value part of the Commencement mode information element is coded as shown in Table 15.2.7-1.
The Commence mode information element is a type 3 information element with a length of 1 octet.
Table 15.2.7-1: Commencement mode
|
Bits |
|||||||||
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
AUTOMATIC COMMENCEMENT MODE |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
MANUAL COMMENCEMENT MODE |
|
|
All other values are reserved. |
|||||||||
15.2.8 Reason
The purpose of the Reason information element is to indicate the reason of the reject.
The Reason information element is coded as shown in table 15.2.8-1.
The Reason information element is a type 3 information element.
Table 15.2.8-1: Reason type
|
Bits |
|||||||||
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
REJECT |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
MEDIA FAILURE |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
BUSY |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
E2E SECURITY CONTEXT FAILURE |
|
|
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
FAILED |
|
|
All other values are reserved. |
|||||||||
15.2.9 Confirm mode indication
The purpose of the Confirm mode indication information element is to indicate that the terminating MCPTT client is expected to confirm call acceptance.
The Confirm mode indication information element is coded as shown in figure 15.2.9-1.
The Confirm mode indication information element is a type 2 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Confirm mode indication IEI |
octet 1 |
|||||||
Figure 15.2.9-1: Confirm mode indication information element
15.2.10 MCPTT user ID
The MCPTT user ID information element is used to indicate an MCPTT user ID.
The MCPTT user ID information element is coded as shown in Figure 15.2.10-1 and Table 15.2.10-1.
The MCPTT user ID information element is a type 6 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Length of MCPTT user ID contents |
octet 1 |
|||||||
|
octet 2 |
||||||||
|
octet 3 |
||||||||
|
MCPTT user ID contents |
||||||||
|
octet n |
||||||||
Figure 15.2.10-1: MCPTT user ID information element
Table 15.2.10-1: MCPTT user ID information element
|
MCPTT user ID is contained in octet 3 to octet n; Max value of 65535 octets. |
15.2.11 Call type
The purpose of the Call type information element is to identify the type of the call.
The value part of the Call type information element is coded as shown in Table 15.2.11-1.
The Call type information element is a type 3 information element with a length of 1 octet.
Table 15.2.11-1: Call type
|
Bits |
|||||||||
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
||
|
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
BASIC GROUP CALL |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
BROADCAST GROUP CALL |
|
|
0 |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
EMERGENCY GROUP CALL |
|
|
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
IMMINENT PERIL GROUP CALL |
|
|
0 |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
PRIVATE CALL |
|
|
0 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
EMERGENCY PRIVATE CALL |
|
|
All other values are reserved. |
|||||||||
15.2.12 User location
The User location information element is used to indicate the current location of the MCPTT client;
The User location information element is coded as shown in Figure 15.2.12-1 and Table 15.2.12-1.
The User location information element is a type 6 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
User location IEI |
octet 1 |
|||||||
|
Length of User location contents |
octet 2 |
|||||||
|
octet 3 |
||||||||
|
octet 4 |
||||||||
|
User location contents |
||||||||
|
octet n |
||||||||
Figure 15.2.12-1: User location information element
Table 15.2.12-1: User location information element
|
User location is contained in octet 4 to octet n; Max value of 65535 octets. |
The User location information element contains the LocationInfo structure defined in clause 7.4 of 3GPP TS 29.199‑9 [59].
15.2.13 Organization name
The Organization name information element is used to indicate the name of the organization to which the user belongs.
The Organization name information element is coded as shown in Figure 15.2.13-1 and Table 15.2.13-1.
The Organization name information element is a type 6 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Length of Organization name contents |
octet 1 |
|||||||
|
octet 2 |
||||||||
|
octet 3 |
||||||||
|
Organization name contents |
||||||||
|
octet n |
||||||||
Figure 15.2.13-1: Organization name information element
Table 15.2.13-1: Organization name information element
|
Organization name is contained in octet 3 to octet n; Max value of 65535 octets. |
15.2.14 Call start time
The Call start time information element is used to indicate the UTC time when a call was started.
The Call start time information element is coded as shown in Figure 15.2.14-1 and Table 15.2.14-1.
The Call start time information element is a type 3 information element with a length of 5 octets.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Call start time value |
Octet 1 Octet 5 |
|||||||
Figure 15.2.14-1: Call start time value
Table 15.2.14-1: Call start time value
|
Call start time value (octet 1 to 5) The Call start time value is an unsigned integer containing UTC time of the time when a call was started, in seconds since midnight UTC of January 1, 1970 (not counting leap seconds). |
15.2.15 Last call type change time
The Last call type change time information identifier is used to indicate the last UTC time when a call priority was changed.
The Last call type change time information element is coded as shown in Figure 15.2.15-1 and Table 15.2.15-1.
The Last call type change time information element is a type 3 information element with a length of 5 octets.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Last call type change time value |
Octet 1 Octet 5 |
|||||||
Figure 15.2.15-1: Last call type change time value
Table 15.2.15-1: Last call type change time value
|
Last call type change time (octet 1 to 5) The Last call type change time value is an unsigned integer containing UTC time of the time when a call priority was changed, in seconds since midnight UTC of January 1, 1970 (not counting leap seconds). |
15.2.16 Probe response
The purpose of the probe response information element is to indicate that the GROUP CALL ANNOUNCEMENT message was sent in response of a GROUP CALL PROBE message.
The probe response information element is coded as shown in figure 15.2.16-1.
The probe response is a type 2 information element.
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
|
Probe Response IEI |
octet 1 |
|||||||
Figure 15.2.16-1: Probe response information element