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557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3 Solution #1.3: E2E Solution to support DualSteer devices in 5GS | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1.0 Background | This solution provides a model for DualSteer device and proposes enhancements in subscription data and UE registration and session management procedures to support steering and switching of traffic via two 3GPP access. The solution is applicable to both DualSteer device that does not support simultaneous transmission o... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1.1 DualSteer device in 5GS | Figure 6.1.3.1.1-1: DualSteer device in 5GS
As per DualSteer requirements, a DualSteer device has two subscriptions/SUPIs that are linked to a single subscription profile from the same operator.
It is clear that to perform steering and switching of application traffic between the two SUPIs there is a need for a DualSte... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1.2 Registration and subscription data impacts to support DualSteer device | The two Ues of a DualSteer device perform individual registration and PDU Session establishment using the two SUPIs. The two subscriptions identified by the two SUPIs are linked together in the home operator network. This subscription level association of the two SUPIs is communicated to the AMF during registration, so... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1.3 Session Management and subscription data impacts to support DualSteer device | For PDU Sessions established via the two different Ues of a DualSteer device that may be subject to traffic switching, it is necessary to select a common PSA UPF. To achieve this, it is proposed that the PDU Sessions associated with a DNN and S-NSSAI combination subject to potential traffic switching, are served by the... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.1.4 Policy to support DualSteer | If dynamic PCC is to be used for DualSteer, the PCF may take DualSteer steering and switching policy decisions and create PCC rules that contain the DualSteer PDU Session Control information, which determines how the uplink and the downlink traffic should be distributed across the two 3GPP accesses from the two SUPIs a... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.2 Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.2.1 Enhancements to Registration procedure | Figure 6.1.3.2.1-1: Registration procedure for a DualSteer device SUPI
Figure 6.1.3.2.1 1 above shows the registration flow of the SUPIs associated with a DualSteer device.
NOTE 1: Figure 6.1.3.2.1 1 shows two Ues in the DualSteer device as the two SUPIs of a DualSteer device act as separate logical Ues in the context ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.2.2 Selecting same SMF for serving PDU Sessions from two SUPIs | Figure 6.1.3.2.2-1: Selecting the same SMF for two SUPIs of a DualSteer device
Figure 6.1.3.2.2 1 above proposes two alternative proposals for selecting the same SMF for PDU Sessions from the two SUPIs of a DualSteer device.
Step 1: UE-1 with SUPI-1 of the DualSteer device registers to the network as explained in claus... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.2.3 Enhancements to PFCP session management | Figure 6.1.3.2.3-1: DualSteer PFCP sessions and SM policy association establishment
Figure 6.1.3.2.3 1 above shows the enhancements in PFCP session between SMF and UPF and SM policy association establishment between SMF and PCF to support the DualSteer.
1. UE-1 is registered over 3GPP access-1 and establishes a DualSte... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.3.3 Impacts on services, entities and interfaces | UE:
- provides an indication of usage with DualSteer device in Registration request.
- provides DualSteer Reg-ID in Registration request (for the alternative where Reg-ID is allocated by DualSteer device and provided to the network during registration).
- receives a confirmation of support for DualSteer feature from AM... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.4 Solution #1.4: Support of DualSteer using overlay-underlay architecture | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.4.1 Description | A DualSteer Device has two SUPIs (i.e. two USIMs) and corresponding PEIs and the DualSteer Device may register to the network over two 3GPP accesses using each SUPI and corresponding PEI.
NOTE 1: This solution does not describe when and how the UE triggers second registration over underlay network. Any other solutions ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.4.2 Procedures | During the Registration procedure, the UE indicates capability of enhanced URSP rule in the policy container.
Reuse existing MA PDU Session Establishment with following changes:
- When a UE establishes MA PDU Session via non-3GPP access though underlay network with 3GPP access, the UE indicates that the request is for ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.4.3 Impacts on services, entities and interfaces | UE:
- support enhanced URSP rule that indicates DualSteer preference.
- indicates DualSteer when the UE establishes MA PDU Session via non-3GPP access though underlay network with 3GPP access.
SMF:
- reports DualSteer indication to the PCF.
PCF:
- support enhanced URSP rule that indicates DualSteer preference.
- based ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5 Solution #1.5: DualSteer Solution on Subscription, Registration, Session Management and Policy Management | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.1 General | Based on comparison of the ATSSS and DualSteer (DS) requirements, there are many similarities like possibility of data transfer over multiple accesses via traffic steering or switching to a PSA UPF in the H-PLMN, possibility of applying similar steering functions (e.g. MPQUIC, MPTCP, etc.) while some differences like D... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.2 Architecture principles | Following diagrams depict sample architectural diagrams.
The PDU session established for each subscription (SUPI_A and SUPI_B) are anchored on the same SMF. Figure 6.1.5.1.2-1 is used as a sample architectural model describing the solution aspects and the registration and PDU session establishment procedures.
Figure 6.... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.3 Subscription Management aspects | Key solution aspects for subscription management are as follows:
- Two subscriptions from the same operator do not need to be explicitly linked in the UDM/UDR.
- The subscriptions can reside in different UDMs or in the same UDM.
- The URSP rules of each subscription/SUPI are maintained in the PCF/UDR separately, i.e. e... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.4 Registration aspects | Key solution aspects when the DualSteer Device/UE registers to a PLMN using one of its active subscriptions:
- Registration Request message: The DualSteer Device/UE indicates to the AMF its capabilities to support for DualSteer and simultaneous/non-simultaneous data transfer.
NOTE: How the UE decides to register to a s... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.5 PDU Session establishment aspects | Key solution aspects when the DualSteer Device/UE establishes PDU sessions for DualSteer over PLMN1 and PLMN2 using SUPI_A and SUPI_B, respectively.
- For a new application data, the DualSteer Device/UE checks the URSP rules of the SUPI (e.g. SUPI_A), and if it finds a matching URSP rule, it initiates a PDU Session est... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.1.6 Policy aspects | - The enhancements to the URSP rules are described in clause 6.1.5.1.3.
- DualSteer rules (i.e. DS rules) for traffic steering and switching are similar to the ones specified for ATSSS rules in Rel-18 with the difference that the DS rules are applicable for two 3GPP access legs while the ATSSS rules are for one 3GPP ac... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.2 Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.2.1 General | Following clauses has the registration and the PDU Session establishment signalling flows based on the sample DualSteer connectivity model depicted in Figure 6.1.5.1.2-1 and the solution descriptions in clause 6.1.5.1.
The signalling flows depicts only the key messages with key/new information elements (marked in red) ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.2.2 Registration procedure | Figure 6.1.5.2.2-1 depicts the registration signalling flow of SUPI_A to PLMN1, where PLMN1 is HPLMN for SUPI_A.
Figure 6.1.5.2.2-1: Registration in PLMN1 with SUPI_A. PLMN1 is HPLMN for SUPI_A
1. The DualSteer Device/UE indicates to the AMF its capabilities to support for DualSteer and simultaneous/non-simultaneous da... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.2.3 PDU Session Establishment procedure | Figure 6.1.5.2.3-1 depicts the PDU Session Establishment signalling flow of SUPI_A to PLMN1, where PLMN1 is HPLMN for SUPI_A. Based on the URSP rules of SUPI_A, the Linked SUPI is SUPI_B.
Figure 6.1.5.2.3-1: PDU Session Establishment in PLMN1 with SUPI_A. PLMN1 is HPLMN for SUPI_A. Linked SUPI = SUPI_B
1. Based on find... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.5.3 Impacts on services, entities and interfaces | UE:
- handle URSP rules with DS components.
- indicates to the AMF its capabilities to support for DualSteer and simultaneous/non-simultaneous data transfer in Registration Request message.
- support sending additional Ies in the PDU Session Establishment Request such as PDU Session ID established by SUPI, DualSteer ID... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6 Solution #1.6: Registration Management and Policy Control for DualSteer Device | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6.1.1 Registration management for DualSteer device | A DualSteer device has two subscriptions/SUPIs, sharing one subscription profile from the same operator. However, the network(s) which the DualSteer device is going to register does not know a priori whether these two subscriptions/SUPIs are in the same DualSteer device. Therefore, the DualSteer device and the network(... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6.1.2 DualSteer policy for DualSteer device after registration for DualSteer device | After two subscriptions/SUPIs registered to the network(s), the DualSteer device needs guidance, when a first application needs to send PDUs (e.g. IP Packets), to determine which subscription/SUPI or which PLMN or which RAT to send (steer/switch) the first application's PDU by using DualSteer traffic steering or switch... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6.2 Procedures | Editor's note: The details of call flows are FFS. |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.6.3 Impacts on services, entities and interfaces | UE(s) with two SUPIs (SUPI1 and SUPI2) in DualSteer Device:
- Needs to determine primary and secondary subscription/SUPI;
- Needs to include the identity information of the other subscription/SUPI (may additionally include UE assisted information) in Registration Requests;
- Is aware of belonging to DualSteer Device/ s... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.7 Solution #1.7: The UE subscription data for DualSteer in the UDM/UDR | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.7.1 Description | This solution addresses the Key Issue #1.1: Subscription aspects to support DualSteer.
This solution shows how the UDM/UDR identifies and associates the two subscriptions/SUPIs for the DualSteer Device in the UE subscription data.
This solution is based on the following assumptions:
- The DualSteer Device has two Ues w... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.7.2 Procedures | The procedure of AMF/SMF retrieving the UE subscription data from the UDM as defined in clause 4.2.2.2 and clause of 4.3.2.2 of TS 23.502 [4] can be reused. |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.7.3 Impacts on services, entities and interfaces | The solution impacts the following network functions:
UDM/UDR:
- Provision DualSteer Subscription data to identify and associate the two subscriptions/SUPIs for DualSteer Device.
UE:
- The USIM profile should also be configured to align with the DualSteer Subscription data in the UDM/UDR.
AMF:
- Control the UE access t... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8 Solution #1.8: DualSteer authorization via Registration procedure | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.1 Description | This solution addressed Key Issue #1.1 "Subscription aspects to support DualSteer" and Key Issue #1.2 "Registration and mobility management for DualSteer".
This solution supports the following assumptions:
Assumption 1: It is not necessary to translate the service requirement regarding the "one subscription profile" in... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.2 Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.2.1 General | The registration procedure for DualSteer Device can be divided into two parts. One is the registration procedure for the primary SUPI as specified in clause 6.1.8.2.2, while the other is the registration procedure for the secondary SUPI as specified in clause 6.1.8.2.3.
NOTE: The procedures are described for the DualSt... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.2.2 Registration procedure for the primary SUPI | Figure 6.1.8.2.2-1: Registration procedure for Primary SUPI
1. The UE uses the primary SUPI to perform Registration procedure. UE sends to AMF 1 via RAN 1 a Registration Request including a DualSteer Capability. The DualSteer Capability further indicates whether the UE is part of a single Dual-USIM DualSteer UE of Dual... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.2.3 Registration Procedure for Secondary SUPI | Figure 6.1.8.2.3-1: Registration procedure for Secondary SUPI
1. Based on the policy from HPLMN, the DualSteer Device may trigger the registration procedure with the secondary SUPI. If the DualSteer Device has not stored the policy from the HPLMN yet, the DualSteer Device may attempt the registration procedure.
2. UE2 ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.8.3 Impacts on services, entities and interfaces | UDM:
- perform the DualSteer authorization based on subscription information.
- correlates the two subscriptions.
- provide the DualSteer Pairing information.
- determine the two Ues are from the same DualSteer device based on DualSteer Pairing information.
AMF:
- control the DualSteer operation based on DualSteer auth... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9 Solution #1.9: DualSteer Registration and Mobility Management | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.1 Description | This is a solution for Registration and Mobility Management aspects for a DualSteer device to support traffic steering and switching when the DualSteer device can perform either non-simultaneous or simultaneous data transmission over the two networks.
DualSteer device supports traffic steering and switching of user dat... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.2 Procedures | Figure 6.1.9.2-1: Registration, Paging and De-registration for a DualSteer Device |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.2.1 DualSteer Registration | The DualSteer registration performs the following steps:
1. The DualSteer device registers with UE-1 on first 3GPP access it supports by sending Registration Request message using SUCI-1 with NW-1 and AMF-1. The UE-1 indicates its capability to support DualSteer functionality as part of the 5GS registration procedure.
... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.2.2 DualSteer De-Registration | The deregistration for UE-1 or UE-2 can be initiated either by the respective UE or the network. The UE or network may de-register either of the access in any order. If one of the access network is de-registered, the UE ceases to operate as a DualSteer Device and the registration for the remaining access that is regist... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.2.3 DualSteer Subscription | The DualSteer device has two subscriptions/SUPIs, sharing one subscription profile from same operator. The two SUPIs/Ues can register to two 3GPP access networks belonging to the same PLMN, or between two different PLMNs, or between one PLMN and one PLMN-integrated NPN, over same or different RAT, which can use terrest... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.9.3 Impacts on services, entities and interfaces | UE:
- Register to two 3GPP access networks separately, one after the other. Indication of capability to support DualSteer functionality in the Registration procedure. Include the correlation id from registration to first access network, in the registration for second access network.
AMF:
- Recognize based on UE capabil... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.10 Solution #1.10: Registration Procedure over second 3GPP access network | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.10.1 Description | A DualSteer Device has two subscriptions/SUPIs sharing one subscription profile. Each subscription/SUPI of the DualSteer Device is used to connect to only one of the 3GPP access networks at any given time. In order to enable the DualSteer functionality, the device should register to the network of the first 3GPP access... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.10.2 Procedures | Figure 6.1.10.2-1: DualSteer Device Registration
In the following, a numeric suffix (1 or 2) is used to differentiate the NFs handling the two registrations. For example, AMF1 refers to the AMF handling the first registration.
1. The device registers over a first 3GPP access network. The network is identified as PLMN1.... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.10.3 Impacts on services, entities and interfaces | UE:
- Receives from HPLMN, updated URSP rules for selection of DualSteer PDU session as well as a network selection policy to select the second 3GPP access network.
- Selects a DualSteer PDU session based on URSP rules.
- Selects the network to provide the second 3GPP access leg based on a network selection policy.
- S... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11 Solution #1.11: Session Establishment | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11.1 Description | 6.1.11.1.0 Overall description
This solution addresses the Key Issue on Session Management for Dual Steer (Key Issue #1.3). In particular, it describes the DualSteer PDU session establishment triggered by a DualSteer Device/UE(s). The principles of the solution are:
- First the DualSteer device needs to register to the... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11.1.1 Proposed URSP enhancements for DualSteer | Since the DualSteer policies apply to both 3GPP access networks, it is proposed that these UE policies for DualSteer, including URSP rules, are handled by the DualSteer Control Function in the DualSteer Device.
The URSP rules are proposed to be enhanced as follows to support URSP rules for DualSteer:
- The Route Select... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11.1.2 DualSteer steering and switching rules (DualSteer UE/UPF Rules) | It is proposed to define DualSteer UE rules, in similar fashion as the ATSSS rules (but without the inclusion of a Load balancing steering mode). When DualSteer applies (i.e. when the preferred access type value is DualSteer, and DualSteer has been enabled), the Dual Steer UE rules apply for traffic steering/switching.... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11.2 Procedures | The solution has the following preconditions:
Precondition 1: Before establishing the DS Session, a DualSteer Device needs to register for both SUPIs to the 5G CN. If the DualSteer device is registered for only one SUPI, the device behaves based on Rel-18 procedures.
NOTE 1: When the DS device registers with SUPI1, the... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.11.3 Impacts on services, entities and interfaces | DualSteer Device (DSCF):
- receives indication that PDU Session is allowed for SUPI 1 and accepted for SUPI 2.
- receives DS UE Rules.
- triggers the PDU Session establishment for SUPI 2.
AMF: no impacts
SMF:
- indicates to UE whether PDU Session for DS is allowed or not.
- selects DS capable UPF for SUPI 1.
- selects ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12 Solution #1.12: Session Management Solution for DualSteer using procedures similar to ATSSS Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12.1 Introduction | The proposed solution leverages the multi-access (MA) PDU session, currently defined for ATSSS, as a PDU session that provides a PDU connectivity service, which can use one access network at a time, or simultaneously one 3GPP access network and one non-3GPP access network. The MA PDU session is extended to a PDU sessio... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12.1.1 DS connectivity service activation for DualSteer | Activating DS connectivity service for DualSteer refers to the establishment of user-plane resources on two 3GPP accesses:
a) if the DS device is registered over both 3GPP access networks in the same PLMN, the DS device initiates the UE-requested PDU session establishment procedure over a selected access. Over which ac... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12.2 Description | Figure 6.1.12.2-1 shows the high-level architecture envisioned for different PLMN scenario (HPLMN and VPLMN) where the two PLMN networks are operated by different service providers. The solution leverages the current procedures defined for Home-Routed (HR) roaming. The solution assumes that a business agreement exists ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12.3 Procedures | This clause defines the device Requested PDU Session Establishment Procedure for DS device with access to two 3GPP networks using different PLMN (HPLMN and VPLMN).
In the case of different PLMN (HPLMN and VPLMN), the PDU Session Establishment procedure is initiated by the DS device across both 3GPP access networks sequ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.12.4 Impacts on services, entities and interfaces | AMF:
- Supports DualSteer capable SMF selection that can support session management across both 3GPP networks.
SMF:
- Supports DualSteer capable PSA UPF selection that can support session management across both 3GPP accesses.
- Indicates DualSteer feature support and sends the DualSteer container IE to the DS device vi... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.13 Solution #1.13: DualSteer solution based on ATSSS | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.13.1 Introduction | The solution specified in this clause defines extensions to the existing ATSSS procedures to support an MA PDU Session with two 3GPP access paths and (optionally) with one non-3GPP access path. The solution applies to a DualSteer device equipped with two different USIMs. Its impact on the 5G network functions is minima... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.13.2 High-level Description | The key principles of the solution are presented below with the aid of Figure 6.1.13.2-1. In this figure, it is assumed that the two 3GPP access paths (3GPP path #1 and 3GPP path #2) are established via different PLMNs. However, the solution is also applicable to scenarios where the two 3GPP access paths are establishe... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14 Solution #1.14: Session management enhancements based on correlation ID | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14.1.1 General | This solution addresses Key Issue #1.3 Session management aspects for DualSteer to provide a solution on selecting same SMF and PSA UPF for correlated PDU sessions of traffic steering or switching. It also provides enhancements on subscription and registration procedure to support the correlation of the PDU sessions.
N... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14.1.2 Subscription enhancement | It is assumed in this solution that the SUPIs within a DualSteer device have separate subscriptions. To support DualSteer device the subscription data of each SUPI includes a DualSteer indication which indicates the SUPI belongs to a DualSteer device.
SMF Selection Subscription data of each SUPI is allocated with the s... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14.2 Procedures | Figure 6.1.14.2-1 illustrates the procedure of the solution.
Figure 6.1.14.2-1: Signaling procedure
0. The UE1/SUPI1 and UE2/SUPI2 are within the DualSteer device. The correlation ID between UE1/SUPI1 and UE2/SUPI2 is allocated and stores into the subscription profiles of SUPI1 and SUPI2 in the UDM.
1. The UE1/SUPI1 in... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.14.3 Impacts on services, entities and interfaces | UE impacts:
- No UE impact.
AMF impacts:
- AMF receives correlation ID from UDM and use it for further PDU session establishment.
- When having received correlation ID from UDM, AMF queries UDM if a SMF has been allocated to the UE/SUPI associated with the correlation ID when receiving a new PDU session establishment r... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15 Solution #1.15: DualSteer policy content and provisioning | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.1.1 General Principle of Policy for DualSteer | This solution mainly addresses the Key Issue #1.4 about policy enhancement for DualSteer. In particular, the policy from the HPLMN includes the policies provided to the UE of DualSteer Device and the policies provided to the NF within the network. The policies provided to the UE of DualSteer cover following aspects:
- ... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.1.2 Proposed solution of policy handling | Policy for registration of Secondary SUPI:
This is a new information of UE policy provisioned to UE. The UE Configuration Update procedure as specified in clause 4.2.4 of TS 23.502 [4] is re-used to provision this policy to UE.
Policy for DualSteer traffic steering:
Option 1: A new UE policy can be introduced to specif... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.1.3 Session management corresponding to the policy handling | This clause describes the assumptions and principles of session management solution corresponding to the policy handing, which are listed below:
Assumption 1: For services that can be switched using DualSteer traffic switching from one 3GPP access using one UE/SUPI of the DualSteer device to the other 3GPP access using... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.2 Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.2.1 General | Clause 6.1.15.2.2 describes the procedure about how the policies for DualSteer are provisioned to the DualSteer Device, while clause 6.1.15.2.3 describes the procedure about how the DualSteer Device establishes the PDU session for DualSteer traffic steering and how to perform session management procedure to achieve Dua... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.2.2 Procedure of provisioning polocies for DualSteer | Figure 6.1.15.2.2-1: Procedure of policy provisioning
1. UE of DualSteer Device performs Registration procedure with Primary SUPI. During the procedure, policies mentioned in clause 6.1.15.1 are generated by PCF based on operator policy. In particular, the policies provisioned to the UE of the DualSteer Device also con... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.2.3 Procedure of session management for DualSteer | The PDU Session handling for DualSteer Device can be divided into two parts. One is the PDU Session Establishment for source UE of the DualSteer device (UE1), and the other one is the procedure of PDU Session Switching from the source UE to the target UE of the DualSteer device (UE2).
Principle for PDU Session Establis... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.15.3 Impacts on services, entities and interfaces | UE PCF:
- Generate and provision the policies for DualSteer to the UE of DualSteer Device by considering the operator's policy, DualSteer subscription and DualSteer Device capability.
UE/DualSteer Device::
- Receive new UE policies or enhanced URSP from the network.
- Evaluate the policies for DualSteer to determine wh... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16 Solution #1.16: Access Selection Policy for selecting a registered UE for traffic transmission | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16.1 Description | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16.1.0 Introduction | This solution is to resolve KI#1.4 on policy enhancement.
The following considerations apply to the solution:
1. Each UE has two USIMs for 3GPP accesses i.e. DualSteer device. The two USIMs belongs to the same MNO.
For DualSteer scenario, usually the VPLMN and HPLMN coverage coexist in a certain area. And for the DualS... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16.1.1 New ASP policy for selecting a registered PLMN for DualSteer traffic transmission | A new UE policy called ASP (Access Selection Policy) is introduced, in which the ASP includes the following aspects:
- Each ASP rule has a Traffic descriptor: identify the application traffic. The format and value can be the same as the TD in URSP rule. Then, under each traffic descriptor, it has:
- Rule precedence: UE... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16.2 Procedures | Figure 6.1.16.2-1: procedure for UE to evaluate ASP and URSP for DualSteer (messages/behaviours with potential new impact are in italic and bold)
Step-1 and 2: The USIM-1(UE1) and USIM-2(UE2) separately perform PLMN selection and registration as defined in clause 4.2.2.2 of TS 23.502 [4] and/or any new enhancement to r... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.16.3 Impacts on services, entities and interfaces | DualSteer Device:
- Support the Access Selection Policy, which is used to determine which USIM/UE is used for the traffic transmission for a service.
AMF:
- No impacts.
PCF:
- Support to determine the Access Selection Policy when the associated two USIMs/Ues registered to the network.
- Support provisioning of Access S... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17 Solution #1.17: URSP provisioning for DualSteer traffic steering | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17.1 Description | This solution addresses the Key Issue#1.1 "Subscription aspects to support DualSteer", Key Issue#1.2 "Registration and mobility management for DualSteer", and Key Issue#1.4 "Policy enhancements for DualSteer". |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17.2 Procedures | |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17.2.1 Information flow | Figure 6.1.17.2.1-1: URSP provisioning for DualSteer traffic steering
1. The DualSteer device performs registration procedure with SUPI#1, it initiates Registration Request (SUCI#1/5G-GUTI#1) message towards the AMF#1 with UE Policy Container, which may contain DualSteer capable indication.
2. During the registration p... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17.2.2 Subscription data | The UE context Policy Control subscription data for this solution is enhanced as following:
Table 6.1.17.2.2-1: UE context Policy Control Subscription data
Subscription data type
Field
Description
UE context policy control subscription data
…
…
DualSteer Ready
Indicates whether the SUPI is ready to be involved for Dual... |
557e33e967524f3273f1f0ba5f818ce9 | 23.700-54 | 6.1.17.3 Impacts on services, entities and interfaces | Editor's note: This clause captures impacts on existing 3GPP services, entities and interfaces.
UDM/UDR:
- Subscription data is enhanced to support DualSteer.
(H-)PCF:
- Determine URSP based on subscription data related to DualSteer.
DualSteer device:
- May indicate DualSteer capable indication to PCF. |
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