Content for TR 22.851 Word version: 19.1.0
5.5 Use Case on Hosted Services
5.5.1 Description
5.5.2 Pre-conditions
5.5.3 Service Flows
5.5.4 Post-conditions
5.5.5 Existing Features partly or fully covering Use Case Functionality
5.5.6 Potential New Requirements needed to support the Use Case
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5.5 Use Case on Hosted Services p. 17
5.5.1 Description p. 17
Subscribers have the opportunity to visit the Hosted Services via its own operator's network, specified in TS 22.261. These Hosted Services contain applications provided by operators and/or trusted 3rd parties. Usually, operators use some technologies to optimize the path of the user plane to reduce latency and bandwidth pressure, if the Hosted Services run on the operator's Service Hosting Environment.
GSMA provides a scenario when Hosted Services of party operator is located at a shared edge node of hosting operator, the Hosted Services are also applicable for the users accessing through the PLMN of party operator. The sharing edge node means that hosting operator deploys applications on cloud resources in its edge node as requested by a party operator and provides an application endpoint to the party operator, referred to S2-2208120.
However, when users access through a shared network, it is still expected the Hosted Services to be available. This use case provides the possibility for subscribers visiting Hosted Services via shared networks.
5.5.2 Pre-conditions p. 17
Assumptions:
- OP1 is a Hosting NG-RAN Operator.
- The core network of OP2, as the participating operator, does not have direct connection with OP1's shared NG-RAN.
- There is connection between the OP1's CN and OP2's CN.
- OP2 provides Hosted Services for subscribers in the local area 1 and 2. OP2 wishes to provide Hosted Services for subscribers accessing through OP1's and OP2's network in the local area 1.
5.5.3 Service Flows p. 18
Figure 5.5.3-1: Scenario of visiting Hosted Services via shared network
(⇒ copy of original 3GPP image)
(⇒ copy of original 3GPP image)
- UE is the subscriber of OP2, and enjoy the Hosted Services of OP2 in the local area 2.
- UE is ready to move to the shared network of OP1. During this process, the Service Hosting Environment hosting the service may or may not change.
- Available Service Hosting Environment can still be found in local area 1 to provide services for UE. The Hosted Services are applicable when the UE crosses the local area 1 and 2 and/or stay within area 1.
5.5.4 Post-conditions p. 18
The visiting hosted service via shared network succeeds, when UE moves between shared access network and participating operator's network.
5.5.5 Existing Features partly or fully covering Use Case Functionality p. 18
Clause 6.5 of TS 22.261 mainly introduces the relevant terms and related requirements of Hosted Services. Some typical requirements for service in network sharing are:
5G is designed to meet diverse services with different and enhanced performances (e.g. high throughput, low latency and massive connections) and data traffic model (e.g. IP data traffic, non-IP data traffic, short data bursts and high throughput data transmissions).
User plane should be more efficient for 5G to support differentiated requirements. On one hand, a Service Hosting Environment located inside of operator's network can offer Hosted Services closer to the end user to meet localization requirement like low latency, low bandwidth pressure. These Hosted Services contain applications provided by operators and/or trusted 3rd parties. On the other hand, user plane paths can be selected or changed to improve the user experience or reduce the bandwidth pressure, when a UE or application changes location during an active communication.
In addition, clause 4.23.9 of TS 23.502 provides some further work related with efficient user plane, which mainly describe additional PDU Session Anchor and Branching Point or UL CL controlled by I-SMF.
5.5.6 Potential New Requirements needed to support the Use Case p. 18
[PR 5.5.6-001]
In case of Indirect Network Sharing, the 5G system shall support a mechanism to enable a UE subscribed to the participating operator to access the participating operator's Hosted Services.
