5 Provisioning of configuration information for 5G ProSe

24.5543GPPProximity-services (ProSe) in 5G System (5GS) protocol aspectsRelease 17Stage 3TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

5.1 Overview

5G ProSe configuration parameters are configured by the related procedures which allow configuration of necessary 5G ProSe configuration parameters to UE.

5.2 Configuration and precedence of 5G ProSe configuration information

5.2.1 General

UE’s usage of 5G ProSe service is controlled by 5G ProSe configration information.

The 5G ProSe configuration information consist of the configuration parameters for 5G ProSe direct discovery, 5G ProSe direct communication, 5G ProSe UE-to-network relay and 5G ProSe usage reporting.

5.2.2 Precedence of 5G ProSe configuration information

The 5G ProSe configuration information for 5G ProSe direct discovery, 5G ProSe direct communication, 5G ProSe UE-to-network relay and 5G ProSe usage reporting can be:

a) pre-configured in the ME;

b) configured in the UICC;

c) provided as a ProSeP by PCF;

d) provided by a ProSe application server via PC1 reference point except:

1) the authorization policy for 5G ProSe direct discovery and restricted ProSe discovery UE ID for restricted direct discovery in parameters for 5G ProSe direct discovery;

2) the authorization policy in parameters for 5G ProSe direct communication;

3) the following parameters for the role of a 5G ProSe UE-to-network relay UE:

i) authorization policy for acting as a 5G ProSe layer-3 and/or layer-2 UE-to-network relay when "served by NG-RAN";

ii) QoS mapping rules for 5G ProSe layer-3 UE-to-network relay; and

iii) a mapping of ProSe identifier(s) to ProSe application server address information for 5G ProSe layer-3 UE-to-network relay UE to relay Ethernet or Unstructured traffic from remote UE by using IP type PDU session;

4) the following parameters for the role of a 5G ProSe remote UE:

i) authorization policy for using a 5G ProSe layer-3 and/or layer-2 UE-to-network relay; and

5) the following parameters for the role of a 5G ProSe UE-to-network relay as well as for the role of a 5G ProSe remote UE:

i) radio parameters for 5G ProSe relay discovery when the UE is not "served by NG-RAN";

ii) radio parameters for 5G ProSe relay communication when the UE is not "served by NG-RAN"; and

iii) security related content for 5G ProSe UE-to-network relay; or

e) a combination of case a), b), c) or d) above.

The UE shall use the 5G ProSe configuration information in the following order of decreasing precedence:

a) the 5G ProSe configuration information provided as a ProSeP by PCF;

b) the 5G ProSe configuration information provided by a ProSe application server via PC1 reference point;

c) the 5G ProSe configuration information configured in the UICC; and

d) the 5G ProSe configuration information pre-configured in the ME.

NOTE: It is not supported for the UE to request or receive any 5G ProSe configuration information from the PCF over the indirect network communication path, when the UE is working as a 5G ProSe remote UE using a 5G ProSe layer-3 UE-to-network relay without involving N3IWF.

5.2.3 Configuration parameters for 5G ProSe direct discovery

The configuration parameters for 5G ProSe direct discovery over PC5 reference point consist of:

a) a validity timer for the validity of the configuration parameter for 5G ProSe direct discovery over PC5 interface;

b) a list of PLMNs in which the UE is authorised to perform open 5G ProSe direct discovery Model A monitoring when the UE is served by NG-RAN;

c) a list of PLMNs in which the UE is authorized to perform open 5G ProSe direct discovery Model A announcing when the UE is served by NG-RAN;

d) a list of PLMNs in which the UE is authorised to perform restricted 5G ProSe direct discovery Model A monitoring when the UE is served by NG-RAN;

e) a list of PLMNs in which the UE is authorized to perform restricted 5G ProSe direct discovery Model A announcing when the UE is served by NG-RAN;

f) a list of PLMNs in which the UE is authorized to perform restricted Model B discoverer operation when the UE is served by NG-RAN;

g) a list of PLMNs in which the UE is authorized to perform restricted Model B discoveree operation when the UE is served by NG-RAN;

h) an indication of whether the UE is authorized to perform 5G ProSe direct discovery for Model A or Model B when "not served by NG-RAN";

i) radio parameters for ProSe direct discover per NR PC5 applicable per geographical area(s) with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when "not served by NG-RAN";

NOTE 1: Whether a frequency band is "operator managed" or "non-operator managed" in a given geographical area is defined by local regulations.

j) a 5G ProSe direct discovery UE ID for restricted direct discovery;

k) a list of group member discovery parameters that enable the group member discovery. For each group the list consists of, one application layer group ID, layer-2 group ID and User info ID;

NOTE 2: User info ID is expected to be assigned uniquely to a user within the discovery group.

l) a list of ProSe identifiers to be used for direct discovery over PC5 interface;

m) a list of ProSe identifiers to default destination layer-2 ID for initial discovery signalling mapping rule. Each mapping rule contains one or more ProSe identifiers and the default destination layer-2 ID for the initial signalling of direct discovery;

n) default PC5 DRX configuration as specified in TS 38.331 [13] when the UE is not served by NG-RAN; and

o) optionally, the 5G DDNMF address information in the HPLMN.

NOTE 3: The security parameters for 5G ProSe direct discovery are provisioned by 5G DDNMF as defined in clause 6.2.

5.2.4 Configuration parameters for 5G ProSe direct communication over PC5 interface

The configuration parameters for 5G ProSe direct communication over PC5 interface consist of:

a) a validity timer for the validity of the configuration parameters for 5G ProSe direct communication over PC5 interface;

b) a list of PLMNs in which the UE is authorized to use 5G ProSe direct communication over PC5 interface when the UE is served by NG-RAN. Each entry of the list contains a PLMN ID in which the UE is authorized to use 5G ProSe direct communication over PC5 interface;

c) an indication of whether the UE is authorized to use 5G ProSe direct communication over PC5 interface when the UE is not served by NG-RAN;

d) the radio parameters of the 5G ProSe direct communication over PC5 interface applicable per geographical area with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when the UE is not served by NG-RAN;

e) configuration parameters for groupcast mode 5G ProSe direct communication for each application layer group, consisting of:

1) application layer group ID;

2) ProSe layer-2 group identifier;

3) ProSe group IP multicast address;

4) an indication of whether the UE is authorized to use IPv4 or IPv6; and

5) optionally, an IPv4 address to be used by the UE as a source address for a specific group if the UE is authorized to use IPv4;

f) configuration parameters for privacy support, consisting of:

1) a list of ProSe applications requiring privacy. Each entry of the list contains one or more ProSe identifiers and one or more geographical areas where the privacy is required; and

2) a privacy timer value as specified in 3GPP TS 24.555 [17];

g) optionally, a list of ProSe identifier to ProSe NR frequency mapping rules. Each mapping rule contains one or more ProSe identifiers and the ProSe NR frequencies with associated geographical areas;

h) a list of ProSe identifier to destination layer-2 ID for broadcast mapping rules. Each mapping rule contains one or more ProSe identifiers and the destination layer-2 ID for broadcast;

i) void;

j) a list of ProSe identifier to default destination layer-2 ID for unicast initial signalling mapping rules. Each mapping rule contains one or more ProSe identifiers and the default destination layer-2 ID for initial signalling to establish unicast connection;

k) a list of ProSe identifier to PC5 QoS parameters mapping rules. The PC5 QoS parameters are specified in clause 5.7 of 3GPP TS 23.304 [2];

l) an AS configuration, including a list of SLRB mapping rules applicable when the UE is not served by NG-RAN. Each SLRB mapping rule contains a PC5 QoS profile and an SLRB. The PC5 QoS profile contains the following parameters:

1) the PC5 QoS profile containing a PQI;

2) if the PQI of the PC5 QoS profile identifies a GBR QoS, the PC5 QoS profile containing a PC5 flow bit rates consisting of a guaranteed flow bit rate (GFBR) and a maximum flow bit rate (MFBR);

3) if the PQI of the PC5 QoS profile identifies a non-GBR QoS, the PC5 QoS profile containing the PC5 link aggregated bit rate consisting of a per link aggregate maximum bit rate (PC5 LINK-AMBR);

NOTE 1: PC5 link aggregated bit rate is only used for unicast mode communications over PC5 interface.

4) the PC5 QoS profile containing a range, which is only used for groupcast mode communications over PC5 interface; and

5) the PC5 QoS profile optionally containing the priority level, the averaging window and the maximum data burst volume. If one or more of the priority levels, the averaging window or the maximum data burst volume are not contained in the PC5 QoS profile, their default values apply;

m) a list of 5G ProSe direct link security policies. Each entry in the list contains a 5G ProSe direct link security policy composed of:

1) one or more ProSe identifiers;

2) the signalling integrity protection policy for the ProSe identifier(s);

3) the signalling ciphering policy for the ProSe identifier(s);

4) the user plane integrity protection policy for the ProSe identifier(s);

5) the user plane ciphering policy for the ProSe identifier(s); and

6) one or more geographical areas where the 5G ProSe direct link security policy applies;

n) a list of ProSe identifiers to default mode of communication mapping rules. Each mapping rule contains one or more ProSe identifiers and the default mode of communication (one of unicast, groupcast or broadcast);

o) a list of ProSe application to path preference mapping rules (i.e., PC5 preferred, Uu preferred, or no preference) as defined in clause 5.4 in 3GPP TS 24.555 [17]. The list of ProSe application to path preference mapping rules are in prioritized order according to the local configuration of the network;

p) a list of ProSe identifiers to NR Tx profiles for broadcast and groupcast mapping rules. Each mapping rule contains one or more ProSe identifiers and the NR Tx profile for broadcast and groupcast as specified in 3GPP TS 38.300 [21] and 3GPP TS 38.331 [13]; and

q) the PC5 DRX configuration for broadcast, groupcast and initial signalling of 5G ProSe direct link establishment, as specified in 3GPP TS 38.331 [13], including the mapping of PC5 QoS profile(s) to PC5 DRX cycle(s) and the default PC5 DRX configuration when the UE is not served by NG-RAN.

NOTE 2: In this release of specification, the application ID defined in 3GPP TS 23.303 [35] can be used as the ProSe identifier in 5G ProSe direct discovery and in a consequent 5G ProSe direct communication.

5.2.5 Configuration parameters for 5G ProSe UE-to-network relay

The configuration parameters for the role of a ProSe UE-to-network relay UE over PC5 reference point consist of:

a) a validity timer for the validity of the configuration parameter for 5G ProSe UE-to-network relay over PC5 interface;

b) a list of PLMNs in which the UE is authorised to relay traffic for 5G ProSe layer-3 remote UEs when the UE is served by NG-RAN and in each PLMN, where that authorization also authorizes the use of both 5G ProSe UE-to-network relay discovery Model A and 5G ProSe UE-to-network relay discovery Model B;

c) a list of PLMNs in which the UE is authorised to relay traffic for 5G ProSe layer-2 remote UEs when the UE is served by NG-RAN and in each PLMN, where that authorization also authorizes the use of both 5G ProSe UE-to-network relay discovery Model A and 5G ProSe UE-to-network relay discovery Model B;

d) the default destination layer-2 ID(s) for sending the discovery signalling for announcement and additional information and for receiving the discovery signalling for solicitation;

NOTE 1: Which default destination layer-2 ID is selected is up to UE implementation when there are more than one default destination layer-2 ID.

e) a User info ID for the UE-to-network relay discovery;

f) one or more relay service code(s) for the UE-to-network relay discovery and for each relay service code:

1) security related content for 5G ProSe relay discovery that is used when the security procedure over control plane as specified in 3GPP TS 33.503 [34] is used, including a validity timer for that security related content;

2) an indication of whether the relay service code is offering 5G ProSe layer-2 or layer-3 UE-to-network relay service;

3) for 5G ProSe layer-3 UE-to-network relay UE, a set of PDU session parameters:

i) PDU session type;

ii) optionally, DNN;

iii) optionally, SSC mode;

iv) optionally, S-NSSAI; and

v) optionally, access type preference;

4) for 5G ProSe layer-2 UE-to-network relay UE and 5G ProSe layer-3 UE-to-network relay UE, security policies for 5G ProSe UE-to-network relay direct communication:

i) the signalling integrity protection policy;

ii) the signalling ciphering policy;

iii) the user plane integrity protection policy; and

iv) the user plane ciphering policy; and

5) for 5G ProSe layer-2 UE-to-network relay UE and 5G ProSe layer-3 UE-to-network relay UE, a control plane security indication to indicate whether to use the security procedure over control plane as specified in 3GPP TS 33.503 [34]. If the control plane security indication indicates not to use the security procedure over control plane, the 5G ProSe UE-to-network relay UE uses the security procedure over user plane as specified in 3GPP TS 33.503 [34];

NOTE 2: If the control plane security indication indicates to use the security procedure over control plane and the 5G ProSe UE-to-network relay UE doesn’t support the security procedure over control plane, the 5G ProSe UE-to-network relay UE doesn’t use that relay service code.

g) for 5G ProSe layer-3 UE-to-network relay UE, QoS mapping rules including:

1) a mapping between a 5QI value and a 5G ProSe PQI value over PC5 for traffic relayed over the PC5 interface;

2) a PDB adjustment factor of the standardized PDB identified by the PQI; and

3) optionally, the relay service code(s) associated with the QoS mapping rule;

h) the radio parameters of the 5G ProSe UE-to-network relay discovery applicable per geographical area with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when the UE is not served by NG-RAN;

i) for 5G ProSe layer-3 UE-to-network relay UE, for Ethernet and Unstructured traffic using IP type PDU session, a list of ProSe identifier(s) to ProSe application server address mapping rule. Each mapping rule contains one or more ProSe identifier(s) and IP address/FQDN and transport layer port number;

j) the radio parameters of the 5G ProSe direct communication applicable per geographical area with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when the UE is not served by NG-RAN;

k) optionally, the 5G PKMF address information;

l) for 5G ProSe UE-to-network relay UE, the default PC5 DRX configuration for discovery as specified in 3GPP TS 38.331 [13] when the UE is not served by NG-RAN; and

m) the privacy timer value for changing the source layer-2 ID assigned by the 5G ProSe UE-to-network relay UE for direct communication, as specified in 3GPP TS 24.555 [17].

The configuration parameters for the role of a 5G ProSe remote UE consist of:

a) a validity timer for the validity of the configuration parameters for 5G ProSe remote UE;

b) an indication whether the UE is authorized to use a 5G ProSe layer-3 UE-to-network relay UE, where that authorization also authorizes the use of both 5G ProSe UE-to-network relay discovery Model A and 5G ProSe UE-to-network relay discovery Model B;

c) a list of PLMNs in which the UE is authorized to use a 5G ProSe layer-2 UE-to-network relay UE, where that authorization also authorizes the use of both 5G ProSe UE-to-network relay discovery Model A and 5G ProSe UE-to-network relay discovery Model B;

d) default destination layer-2 ID(s) for sending the discovery signalling for solicitation and for receiving the discovery signalling for announcement and additional information;

NOTE 3: Which default destination layer-2 ID is selected is up to UE implementation when there are more than one default destination layer-2 ID.

e) a user info ID for the UE-to-network relay discovery;

f) one or more relay service code(s) for the UE-to-network relay discovery and for each relay service code:

2) an indication of whether the relay service code is offering 5G ProSe layer-2 or layer-3 UE-to-network relay service;

3) for 5G ProSe remote UE using 5G ProSe layer-3 UE-to-network relay, one of the following:

i) a set of PDU session parameters for the relayed traffic without using N3IWF access:

A) PDU session type;

B) optionally, DNN;

C) optionally, SSC mode;

D) optionally, S-NSSAI; and

E) optionally, access type preference; or

ii) an indication of using N3IWF access for the relayed traffic;

4) for 5G ProSe remote UE using 5G ProSe layer-2 UE-to-network relays or 5G ProSe layer-3 UE-to-network relay, security policies for 5G ProSe UE-to-network relay direct communication:

i) the signalling integrity protection policy;

ii) the signalling ciphering policy;

iii) the user plane integrity protection policy; and

iv) the user plane ciphering policy;

5) optionally, for 5G ProSe remote UE using 5G ProSe layer-3 UE-to-network relay, the ProSe application traffic descriptor(s) (as defined in 3GPP TS 24.526 [5]) to be used for the relayed traffic; and

6) for 5G ProSe remote UE using 5G ProSe layer-2 UE-to-network relay or 5G ProSe layer-3 UE-to-network relay, a control plane security indication to indicatewhether to use the security procedure over control plane as specified in 3GPP TS 33.503 [34]. If the control plane security indication indicates not to use the security procedure over control plane, the 5G ProSe remote UE uses the security procedure over user plane as specified in 3GPP TS 33.503 [34];

NOTE 4: If the control plane security indication indicates to use the security procedure over control plane and the 5G ProSe remote UE doesn’t support the security procedure over control plane, the 5G remote UE doesn’t use the corresponding relay service code.

g) the radio parameters of the 5G ProSe Relay Discovery applicable per geographical area with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when the UE is not served by NG-RAN;

h) the radio parameters of the 5G ProSe direct communication applicable per geographical area with an indication of whether these radio parameters are "operator managed" or "non-operator managed" when the UE is not served by NG-RAN;

NOTE 5: Whether a frequency band is "operator managed" or "non-operator managed" in a given Geographical Area is defined by local regulations.

i) if at least one relay service code is configured with the indication of using N3IWF access for the relayed traffic, the N3IWF selection information for 5G ProSe layer-3 remote UE:

1) N3IWF identifier configuration (either FQDN or IP address); and

2) 5G ProSe layer-3 UE-to-network relays, access node selection information, which consists of a prioritized list of PLMNs for N3IWF selection and an indication that the selection of an N3IWF in a PLMN should be based on Tracking Area Identity FQDN or on Operator Identifier FQDN;

j) optionally, the 5G PKMF address information;

k) for 5G ProSe remote UE, the default PC5 DRX configuration for discovery as specified in 3GPP TS 38.331 [13] when the UE is not served by NG-RAN; and

l) the privacy timer value for changing the source layer-2 ID assigned by the 5G ProSe remote UE for direct communication, as specified in 3GPP TS 24.555 [17].

5.2.6 Configuration parameters for 5G ProSe usage information reporting

The configuration parameters for 5G ProSe usage information reporting consist of:

a) a validity timer for the validity of the configuration parameters for 5G ProSe usage information reporting;

b) the 5G DDNMF CTF (ADF) address information to which the UE uploads the usage information reports;

c) the collection period;

d) the reporting window;

e) for broadcast and groupcast mode 5G ProSe direct communication, whether or not the UE reports the group parameters in the usage information;

f) whether or not the UE reports the time stamps of the first transmission/reception during the collection period in the usage information;

g) whether or not the UE reports the amount of data transmitted during the collection period in the usage information, and whether with location information;

h) whether or not the UE reports the amount of data received during the collection period in the usage information, and whether with location information;

i) whether or not the UE reports the time stamps when it went in and out of NG-RAN coverage during the collection period in the usage information;

j) whether or not the UE reports the list of locations of the UE when in NG-RAN coverage during the reporting period in the usage information;

k) whether or not the UE reports the radio parameters used for 5G ProSe direct communication (i.e. indicator of which radio resources used and radio frequency used) during the reporting period in the usage information; and

l) whether or not the UE reports the QoS flow information (i.e. PC5 QoS flow identifier, PC5 QoS flow descriptions) during the reporting period in the usage information.

5.3 Procedures

5.3.1 General

The procedure for provisioning of parameters for 5G ProSe allows the UE to obtain 5G ProSe policy (ProSeP).

5.3.2 UE-requested ProSeP provisioning procedure

5.3.2.1 General

The UE-requested ProSeP policy provisioning procedure enables the UE to request ProSeP from the PCF in the following cases:

a) if the T5051 for a UE policies for 5G ProSe direct discovery expires;

b) if the T5052 for a UE policies for 5G ProSe direct communications expires;

c) if the T5053 for a UE policies for 5G ProSe UE-to-network relay UE expires;

d) if the T5054 for UE policies for 5G ProSe remote UE expires;

e) if the T5057 for UE policies for 5G ProSe usage information reporting expires; and

f) if there are no valid configuration parameters, e.g., for the current area, or due to abnormal situation.

The UE shall follow the principles of PTI handling for UE policy delivery service procedures defined in 3GPP TS 24.501 [11] clause D.1.2.

5.3.2.2 UE-requested ProSeP policy provisioning procedure initiation

In order to initiate the UE-requested ProSeP policy provisioning procedure, the UE shall create a UE POLICY PROVISIONING REQUEST message (see example in figure 5.3.2.2.1). The UE:

a) shall allocate a PTI value currently not used and set the PTI IE to the allocated PTI value;

b) shall include the Requested UE policies IE indicating whether the UE policies for 5G ProSe direct discovery, the UE policies for 5G ProSe direct communications, the UE policies for 5G ProSe UE-to-network relay, the UE policies for 5G ProSe remote UE, the UE policies for 5G ProSe usage information reporting, or any combination of them are requested;

c) shall transport the UE POLICY PROVISIONING REQUEST message using the NAS transport procedure as specified in 3GPP TS 24.501 [11] clause 5.4.5; and

d) shall start timer T5040.

Figure 5.3.2.2.1: UE-requested ProSeP policy provisioning procedure

5.3.2.3 UE-requested ProSeP policy provisioning procedure accepted by the network

Handling in 3GPP TS 24.587 [18] clause 5.3.2.3 shall apply.

If new UE policies for 5G ProSe direct discovery are included in the MANAGE UE POLICY COMMAND message, the UE shall stop timer T5051 if it is running and start timer T5051 with the value included in the UE policies for 5G ProSe direct discovery and start using the new UE policies for 5G ProSe direct discovery included in the MANAGE UE POLICY COMMAND message.

If new UE policies for 5G ProSe direct communications are included in the MANAGE UE POLICY COMMAND message, the UE shall stop timer T5052 if it is running and start timer T5052 with the value included in the UE policies for 5G ProSe direct communications and start using the new UE policies for 5G ProSe direct communications included in the MANAGE UE POLICY COMMAND message.

If new UE policies for 5G ProSe UE-to-network relay UE are included in the MANAGE UE POLICY COMMAND message, the UE shall stop timer T5053 if it is running and start timer T5053 with the value included in the UE policies for 5G ProSe UE-to-network relay UE and start using the new UE policies for 5G ProSe UE-to-network relay UE included in the MANAGE UE POLICY COMMAND message. If the security related parameters for discovery are included in the new UE policies for 5G ProSe UE-to-network relay UE in the MANAGE UE POLICY COMMAND message and the security procedure over control plane as specified in 3GPP TS 33.503 [34] is used, the UE shall stop timer T5056 if it is running and start timer T5056 with the value included in the security related parameters for discovery, and start using the security related parameters for discovery included in the new UE policies for 5G ProSe UE-to-network relay UE.

If new UE policies for 5G ProSe remote UE are included in the MANAGE UE POLICY COMMAND message, the UE shall stop timer T5054 if it is running and start timer T5054 with the value included in the UE policies for 5G ProSe remote UE and start using the new UE policies for 5G ProSe remote UE included in the MANAGE UE POLICY COMMAND message. If the security related parameters for discovery are included in the new UE policies for 5G ProSe remote UE in the MANAGE UE POLICY COMMAND message and the security procedure over control plane as specified in 3GPP TS 33.503 [34] is used, the UE shall stop timer T5056 if it is running and start timer T5056 with the value included in the security related parameters for discovery, and start using the security related parameters for discovery included in the new UE policies for 5G ProSe remote UE.

If new UE policies for 5G ProSe usage information reporting are included in the MANAGE UE POLICY COMMAND message, the UE shall stop timer T5057 if it is running and start timer T5057 with the value included in the UE policies for 5G ProSe usage information reporting, and start using the UE policies for 5G ProSe usage information reporting included in the MANAGE UE POLICY COMMAND message.

5.3.2.4 UE-requested ProSeP policy provisioning procedure not accepted by the network

Handling in 3GPP TS 24.587 [18] clause 5.3.2.4 shall apply.

5.3.2.5 Abnormal cases on the network side

Handling in 3GPP TS 24.587 [18] clause 5.3.2.5 shall apply.

5.3.2.6 Abnormal cases on the UE

Handling in 3GPP TS 24.587 [18] clause 5.3.2.6 shall apply.