Content for TR 22.803 Word version: 12.2.0
5.2 Public Safety Use Cases
5.2.1 General
5.2.2 ProSe Discovery Within Network Coverage
5.2.3 ProSe Discovery Out of Network Coverage
5.2.4 Can Discover But Not Discoverable
5.2.5A Basic ProSe One-to-One Direct User Traffic Initiation in Public Safety Spectrum
5.2.6A UE with Multiple One-to-One Direct User Traffic Sessions in Public Safety Spectrum
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5.2 Public Safety Use Cases p. 25
5.2.1 General p. 25
It is noted that the following use cases and requirements are specific needs that are applicable for public safety in addition to those general use cases and requirements in the preceding clause.
5.2.2 ProSe Discovery Within Network Coverage p. 26
5.2.2.1 Description p. 26
This use case describes the scenario where a given UE discovers one or more other UEs while in E-UTRAN coverage, with ProSe Discovery always enabled.
5.2.2.2 Pre-Conditions p. 26
An operator offers a service which makes use of the ProSe feature.
Officer A, Officer B, and Officer C use ProSe-enabled public safety UEs, and are all within E-UTRAN coverage.
Officer A, Officer B, and Officer C have configured ProSe Discovery on their UE's such that they can discover other UEs and be discovered by other UEs.
Officer A is not in proximity to Officer B and Officer C, who are both within proximity of each other.
Officer B's UE and Officer C's UE have discovered each other.
5.2.2.3 Service Flows p. 26
Officer A moves into proximity of Officer B and Officer C.
Officer A's UE discovers Officer B's UE and Officer C's UE upon entering proximity.
Officer B's UE and Officer C's UE discover Officer A's UE upon entering proximity.
5.2.2.4 Post-Conditions p. 26
None.
5.2.2.5 Potential Requirements p. 26
[PR.53]
A ProSe-enabled public safety UE with ProSe Discovery enabled for discovery of other public safety UEs shall be able to discover other discoverable public safety UEs, without network interaction if allowed by the operator, even when under E-UTRAN coverage whether or not ProSe Communication is used.
[PR.54]
A user of a ProSe-enabled public safety UE shall be able to activate or deactivate the UE's ProSe Discovery feature while under E-UTRAN coverage, if allowed by the operator whether or not ProSe Communication is used.
5.2.3 ProSe Discovery Out of Network Coverage p. 26
5.2.3.1 Description p. 26
This use case describes the scenario where a given UE discovers one or more other UEs while out of E-UTRAN coverage, with ProSe Discovery always enabled.
5.2.3.2 Pre-Conditions p. 26
An operator offers a service, which makes use of the ProSe feature.
Officer A, Officer B, and Officer C use ProSe-enabled public safety UEs, and Officer A is in E-UTRAN coverage while Officers B and C are out of E-UTRAN coverage.
Officer A, Officer B, and Officer C have activated ProSe Discovery on their UEs such that they can discover other UEs and be discovered by other UEs.
Officer A is not in proximity to Officers B and C, who are both within proximity of each other.
Officer B's UE and Officer C's UE have discovered each other.
5.2.3.3 Service Flows p. 27
Officer A moves into proximity of Officers B and C.
Officer A's UE discovers Officer B's UE and Officer C's UE upon entering proximity.
Officer B's UE and Officer C's UE discover Officer A's UE upon entering proximity.
5.2.3.4 Post-Conditions p. 27
None.
5.2.3.5 Potential Requirements p. 27
[PR.55]
A ProSe-enabled public safety UE with ProSe Discovery enabled shall be able to discover other discoverable public safety UEs when some or all of the UEs involved in ProSe Discovery are out of E-UTRAN coverage whether or not ProSe Communication is used.
[PR.56]
A user of a ProSe-enabled public safety UE shall be able to activate or deactivate the UE's ProSe Discovery feature when out of E-UTRAN coverage whether or not ProSe Communication is used.
5.2.4 Can Discover But Not Discoverable p. 27
5.2.4.1 Description p. 27
This use case describes the scenario where a given UE is able to discover other UEs, but is not discoverable by other UEs.
5.2.4.2 Pre-Conditions p. 27
An operator offers a service, which makes use of the ProSe feature.
Officer A, Officer B, and Officer C use ProSe-enabled public safety UEs, and some or all of them are out of E-UTRAN coverage.
Officer A and B have configured ProSe Discovery on their UEs such that they can discover other UEs and be discovered by other UEs.
Officer C has enabled ProSe Discovery on his/her UE that is configured such that it can discover other UEs but cannot be discovered by other UEs.
Officer A, Officer B, and Officer C are all within proximity of each other.
5.2.4.3 Service Flows p. 27
Officer A's UE discovers Officer B's UE.
Officer B's UE discovers Officer A's UE.
Officer C's UE discovers Officer A's UE and Officer B's UE.
Officer A's UE and Officer B's UE do not discover Officer C's UE.
5.2.4.4 Post-Conditions p. 27
None.
5.2.4.5 Potential Requirements p. 27
[PR.57]
The configuration of a ProSe-enabled public safety UE that allows the UE to discover other discoverable public safety UEs shall be independent from its configuration to allow or not to allow other ProSe-enabled public safety UEs to discover it.
5.2.5 Void
5.2.5A Basic ProSe One-to-One Direct User Traffic Initiation in Public Safety Spectrum p. 28
5.2.5A.1 Description p. 28
This use case describes the case where a given public safety UE initiates one-to-one direct user traffic session with another UE.
5.2.5A.2 Pre-Conditions p. 28
An operator offers a service, which makes use of the ProSe feature.
Officer A and Officer B use ProSe-enabled public safety UEs.
Officer A and Officer B are subscribed to a Public Safety service that allows them to use ProSe.
Officer A and Officer B may or may not be in E-UTRAN coverage.
5.2.5A.3 Service Flows p. 28
The two public safety UEs discover each other via ProSe Discovery.
Officer A wants to communicate with Officer B, or vice versa. Officer A's UE and Officer B's public safety UE are able to initiate a direct connection and exchange user traffic over the air using the public safety spectrum.
5.2.5A.4 Post-Conditions p. 28
Officer A communicates with Officer B using one-to-one direct communication.
5.2.5A.5 Potential Requirements p. 28
[PR.58]
Two public safety UEs whether they are in E-UTRAN coverage or not, shall be capable of establishing a secure direct connection and exchange user traffic on public safety spectrum, assuming they are in radio range, are authenticated and authorized.
[PR.59]
The operator shall be able to authorize public safety UEs to establish data sessions between them using ProSe via network control when there is E-UTRAN coverage for at least one of the two public safety UEs. An operator shall be able to configure a Public Safety UE (e.g., in the USIM or ME) with the permission to establish data session(s), with one or more UEs, without the UE performing prior registration into the network.
[PR.117]
The system shall enable public safety UEs to mutually authenticate each other when not in network coverage.
5.2.6 Void
5.2.6A UE with Multiple One-to-One Direct User Traffic Sessions in Public Safety Spectrum p. 28
5.2.6A.1 Description p. 28
This use case describes the case where a given UE can concurrently maintain one-to-one user traffic sessions with several other UEs.
5.2.6A.2 Pre-Conditions p. 28
The preconditions are as in clause 5.2.5 with the additions below:
Officer C uses a ProSe-enabled public safety UE;
Officer C is subscribed to a Public Safety service that allows him/her to use ProSe.
Officer C may or may not be in E-UTRAN coverage.
5.2.6A.3 Service Flows p. 29
The three UEs discover each other via ProSe Discovery.
Officer A wants to communicate with Officer B and Officer C concurrently.
While Officer A's UE and Officer B's UE exchange user traffic via a direct connection, Officer A's UE and Officer C's UE are able to initiate an additional ProSe direct connection and exchange user traffic over the air using the public safety spectrum.
5.2.6A.4 Post-Conditions p. 29
Officer A communicates with Officer B and Officer C concurrently.
5.2.6A.5 Potential Requirements p. 29
[PR.60]
Assuming UEs are in radio range, are authenticated and are authorized, a public safety UE in or out of E-UTRAN coverage on public safety spectrum dedicated to ProSe services, shall be capable of establishing multiple one-to-one ProSe direct connections, and of exchanging user traffic with each UE concurrently across these multiple one-to-one ProSe connections.
