Page 238 - 5G Basics - Core Network Aspects

1 Core network aspects

– Easy management of network: Resources and network functions can be managed with logically
centralized, intelligent and automatic operations.
NOTE – In this Recommendation, scaling includes scaling in/out, as described in [b-ETSI GS NFV 003]. The virtualization
of control network entities (VCN) [ITU-T Y.2320] can be supporting technology of SAME.

7 Requirements of SAME

This clause focuses on the key requirements for SAME.

R1 – Support the capability of flexible traffic steering
SAME aims to support flexible enhancement of new capabilities by adding specific service function entities
without affecting existing service function entities. To achieve this, SAME is expected to satisfy the
requirements below.

– It is required to support flexibly steering traffic passing through necessary service function entities
according to the policies.

– It is required to define and update the traffic steering policies based on the following information:
• application characteristics of traffic such as application type, and application protocol;
• access network information of traffic such as IMT-2000 access, IMT-Advanced access;
• users' subscription information such as users' priorities;
• service function entities' status such as the failure of service function entities.
– It is required to support layer 3 through layer 7 (L3-L7) traffic classification.

R2 – Support virtualization of SAME network functions
In SAME, virtualization refers to those network entities and/or functions run on virtual computing, storage
and networking resources, leveraging the hardware and software decoupling. On virtualization, SAME is
expected to satisfy the requirements below.
– It is required to provide a capability for agile and flexible deployment of network functions.
– It is required to provide a capability for scalability of network capacity by auto scaling mechanism.
– It is required to provide a capability for efficient resource usage.

– It is required to provide a capability for isolation of resource usage for different tenants.
– It is required to provide a capability for operation, maintenance management and orchestration of
the infrastructure in an automatic and centralized manner.

– It is required to provide a capability to allow the virtualized resource usage to the third party.
NOTE 1 – The third party assumes network customer, e.g., a mobile virtual network operator (MVNO). The third party
can raise the requirement to the SAME for using network resources. A tenant or multiple tenants in the SAME are
utilized to compose the third party's service.
NOTE 2 – Network function virtualization (NFV) [b-ETSI GS NFV 001] [b-ETSI GS NFV 002] could be a potential technology
for SAME to realize the virtualization.

R3 – Support SAME network slice
SAME network slice is a set of SAME network functions and their related physical or virtual resources, forming
a complete logical network to provide certain network characteristics. A SAME network slice is isolated from
other slices based on common infrastructure. Resources can be computing, storage and networking resource.
To this end, SAME is expected to satisfy the requirements below.
– It is required to provide a capability to support the SAME network slices, including the
creation/modification/deletion of the SAME network slices.
– It is required to provide a capability to monitor the performance and operating status of the SAME
network slices.

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