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Content for  TS 33.107  Word version:  16.0.0

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16  LI for Group Communications using GCSE |R12|Word‑p. 185

16.1  Background

There are several scenarios possible for the interception of group communications involving GCSE (see TS 22.468 and TS 23.468). First is where the GCSE AS is part of an operator's network. Second is where the GCSE AS is outside of the intercepting operator's network. This clause specifies LI solutions for both cases.

16.2  GCSE AS in Operator Network

16.2.0  General

In the case where the GCSE AS is in the operator's network, the ICE in this case will be the GCSE AS as it is fully aware of the group communications as well as the parties on the communications. The solution is very similar to the conferencing solution specified in Clause 11, where the main difference is that a single functional entity (the GCSE AS) is utilized for GCSE, rather than two functional entities.
[not reproduced yet]
Figure 16.1: GCSE AS Intercept configuration
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16.2.1  Provision of Content of Communications

16.2.1.0  General

Figure 16.2 shows the interception of the content of communications for GCSE at the GCSE AS is performed based on identifying the target of interception being a member of a group communication at the GCSE AS.
[not reproduced yet]
Figure 16.2: Provision of Intercept Product from GCSE AS
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16.2.1.1  X3-interfaceWord‑p. 186
In addition to the intercepted content of communications, the following information may need to be transferred from the GCSE AS to the DF3 in order to allow the DF3 to perform its functionality:
  • identity used for interception include IMSI, IMEI, ProSe UE ID (see TS 22.278 and TS 23.303);
  • correlation number;
  • the identity of source (i.e. group communications party identity) of a media stream;
  • time stamp;
  • direction (from target or to target).
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16.2.2  Provision of Intercept Related Information

16.2.2.0  General

Figure 16.3 shows the transfer of intercept related information to the DF2. If an event for / from a GCSE user occurs, the GCSE ASshall send the relevant data to the DF2.
[not reproduced yet]
Figure 16.3: Provision of Intercept Related Information
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16.2.2.1  X2-interfaceWord‑p. 187
The following information needs to be transferred from the GCSE AS to the DF2 in order to allow a DF2 to perform its functionality:
  • target identity include IMSI, IMEI, ProSe UE ID;
  • events and associated parameters as defined in clauses 12.2.1.2 and 12.2.3 may be provided.
The IRI should be sent to DF2 using a reliable transport mechanism.

16.2.2.2  GCSE AS LI Events and Event Information

16.2.2.2.0  General
Intercept Related Information events to be reported by the GCS AS include:
  • When GCSE communications group involving a target of interception is activated (enabled for communications)
  • When GCSE communications group involving a target of interception is deactivated (no longer enabled for communications)
  • When a User is added to an active GCSE communications group
  • When a User is dropped from an active GCSE communications group
  • Start of Interception with an Active GCSE communications Group
  • End of Interception with an Active GCSE communications Group
  • Modification of Target Connection to GCS AS.
A set of possible elements as shown in Table 16.4 are used to generate the events.
Element
Description

Observed IMSI
IMSI of the target.
Observed IMEI
IMEI of the target.
Observed ProSe UE ID
ProSe UE ID of the target.
Observed Other Identity
Other Identity of the target
Event type
Description which type of event is delivered: Group Activated, Group Deactivated. Group Add Member, Group Drop Member, Start of Intercept with Active Group, End of Intercept with Active Group, Modification of Active Group.
Event date
Date of the event generation in the GCS AS.
Event time
Time of the event generation in the GCS AS. Timestamp shall be generated relative to the GCS AS internal clock.
Observed Communications Group ID
Identifies the GCSE communications group at the GCS AS.
GCSE Group Communication Characteristics
Details of the Group Communications Service to which the Target is a member including such characteristics such as voice, video, and data communications.
GCSE Communications Group Membership List
List of all users that are members of the GCSE communications group. Not all members may be participants in a group communications.
GCSE Communications Group Participants
List of all users that are participating in the GCSE communications group.
Correlation Number
The correlation number is used to correlate CC and IRI. The correlation number is also used to allow the correlation of IRI records.
Network Element Identifier
Unique identifier for the element reporting the ICE.
Added User ID
Identity of the party successfully added to an active GCSE Communications Group.
Dropped User ID
Identity of the party successfully dropped from an active GCSE Communications Group.
Target Connection Method
Identifies the current target connection method with the GCS AS including whether the target is connected at all.
Modified Target Connection Method
Identifies the modified target connection method with the GCS AS when the target connection method changes including whether the target is connected at all.
Identity of Visited Network
Identifies the visited network from which the target is connecting to the GCS AS.
Length of TMGI Reservation Time
Identifies the length of time reserved for use of a TMGI for a GCSE Communications Group.
Reserved TMGI
Identifies the TMGI reserved for use by a GCSE Communications Group.
Location information
Location information of the target, e.g., Cell ID as known by the GCS AS.
Time of Location
Date/Time of location. The time when location was obtained by the location source node.

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16.2.2.2.1  Activation of GCSE Communications GroupWord‑p. 188
When a GCSE communications group is activated at the GCS AS (i.e., enabled for communications), an Activation of GCSE Communications Group event is generated in the following cases:
  • When the GCS AS successfully activates a GCSE communications group in which a member is a target of interception.
The fields, shown in Table 16.5, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
Target Connection Method
GCSE communications group membership list
GCSE communications group participants
Group Communications Characteristics
Observed Communications Group ID
Reserved TMGI
Length of TMGI reservation time (if known)
Identity of Visited Network (if known)

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16.2.2.2.2  Deactivation of GCSE Communications GroupWord‑p. 189
When a GCSE communications group is deactivated (not enabled for communications) at the GCS AS, a Deactivation of GCSE Communications Group event is generated in the following cases:
  • When the GCS AS successfully releases a GCSE communications group in which a member is a target of interception.
The fields, shown in Table 16.6, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
GCSE communications group membership list
Observed Communications Group ID
Reserved TMGI
Length of TMGI reservation time (if known)
Identity of Visited Network (if known)
Location Information
Time of Location

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16.2.2.2.3  User Added
A User Added-event is generated in the following cases:
  • When a user is successfully added to a GCSE communications group in which a member is a target of interception.
The fields, shown in Table 16.7, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
Added User ID
GCSE communications group membership list
Observed Communications Group ID
GCSE communications group participants
Reserved TMGI
Identity of Visited Network (if known)

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16.2.2.2.4  User DroppedWord‑p. 190
A User Dropped-event is generated in the following cases:
  • When a user is successfully dropped from a GCSE communications group in which a member is a target of interception.
The fields, shown in Table 16.8, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
Dropped User ID
GCSE communications group membership list
Observed Communications Group ID
GCSE communications group participants
Reserved TMGI
Identity of Visited Network (if known)

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16.2.2.2.5  Start of Intercept with an Active GCSE Communications Group
When an intercept is started with an active GCSE communications group, a Start of Intercept for GCSE Communications Group event is generated in the following cases:
  • When a target of interception is successfully added to an active GCSE communications group.
  • When interception is activated for a target of interception who is already a member of an active GCSE communications group.
The fields, shown in Table 16.9, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
Target Connection Method
GCSE communications group membership list
Group Communications Characteristics
Observed Communications Group ID
GCSE communications group participants
Reserved TMGI
Length of TMGI reservation time (if known)
Identity of Visited Network (if known)
Location Information
Time of Location

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16.2.2.2.6  End of Intercept with an Active GCSE Communications GroupWord‑p. 191
When an intercept is ended with an active GCSE communications group, an End of Intercept for GCSE Communications Group event is generated in the following cases:
  • When a target of interception is successfully dropped from an active GCSE communications group.
The fields, shown in Table 16.10, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
GCSE communications group membership list
Observed Communications Group ID
GCSE communications group participants
Reserved TMGI
Length of TMGI reservation time (if known)
Identity of Visited Network (if known)
Location Information
Time of Location

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16.2.2.2.7  Modification of Target Connection to GCS AS
When a modification to a target connection to the GCS AS occurs, a Modification of Target Connection event is generated in the following cases:
  • When a target of interception changes the current downlink communications reception method to now receive only via a unicast link, only via a multicast link, or via both unicast and multicast links.
  • When the target of interception changes the uplink and downlink connection method from not connected to one of the connected connection methods, and vice versa.
The fields, shown in Table 16.11, will be delivered to the DF2, if available, by the GCS AS.
Information Element

Observed IMSI
Observed IMEI
Observed ProSe UE ID
Observed Other Identity
Event Type
Event Time
Event Date
Network Element Identifier
Correlation Number
Modified Target Connection Method
GCSE communications group membership list
Group Communications Characteristics
Observed Communications Group ID
GCSE communications group participants
Reserved TMGI
Length of TMGI reservation time (if known)
Identity of Visited Network (if known)
Location Information
Time of Location

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16.3  GCS AS outside Intercepting CSP NetworkWord‑p. 192
Interception of group communications by the intercepting CSP when the GCS AS is outside of the CSP's network, is not provided in this release. Packet data interception capabilities can be used to intercept and report a target's communication.


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