omniran-16-0071-01-CF00 Network instantiation Date: 2017-11-03 Authors: Name Affiliation
omniran-16-0071-01-CF00 Network instantiation Date: 2017-11-03 Authors: Name Affiliation Phone Email Max Riegel Nokia Bell Labs +491732938240 [email protected] Notice: This document does not represent the agreed view of the IEEE 802.1 OmniRAN TG. It represents only the views of the participants listed in the Authors: field above. It is offered as a basis for discussion. It is not binding on the contributor, who reserve the right to add, amend or withdraw
material contained herein. Copyright policy: The contributor is familiar with the IEEE-SA Copyright Policy . Patent policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and . Abstract The presentation provides introductory thoughts on network instantiation in the scope of P802.1CF The current revision provides further proposed content based on the discussions in the October 25th discussions. 1 omniran-16-0071-01-CF00 Key Concepts of Network Instantiation Max Riegel (Nokia Bell Labs) 2
omniran-16-0071-01-CF00 Oct 25th confcall discussions From the minutes: The group could not reach agreements on either the usage of virtual network and virtualized network, or the scope of the instantiation and release procedure. Antonio pointed out that the concept of virtualized network is much broader than instantiation and suggested to stick the description of instantiation procedures to network slicing rather not mentioning virtual network or virtualized network at all in this chapter. He also mentioned a white paper published by NGMN and will present to the group later for clarifying the above issues. The link to the paper was provided by Antonio by email: https://www.ngmn.org/uploads/media/160113_Network_Slicing _v1_0.pdf 3 omniran-16-0071-01-CF00 Description of Network Slicing Concept by NGMN Alliance Network slicing concept consists of 3 layers:
1) Service Instance Layer, 2) Network Slice Instance Layer, and 3) Resource layer. Figure from NGMN whitepaper 4 omniran-16-0071-01-CF00 Description of Network Slicing Concept by NGMN Alliance, cont. The Service Instance Layer represents the services (end-user service or business services) which are to be supported. A network operator uses a Network Slice Blueprint to create a Network Slice Instance. A Network Slice Instance provides the network characteristics which are required by a Service Instance. A Network Slice Instance may also be shared across multiple Service Instances provided by the network operator. The Network Slice Instance may be composed by none, one or more Sub-network Instances, which may be shared by another Network Slice Instance. Similarly, the Sub-network Blueprint is used to create a Subnetwork Instance to form a set of Network Functions, which run on the physical/logical resources.
5 omniran-16-0071-01-CF00 NGMN Definitions Service Instance: An instance of an end-user service or a business service that is realized within or by a Network Slice Network Slice Instance: a set of network functions, and resources to run these network functions, forming a complete instantiated logical network to meet certain network characteristics required by the Service Instance(s). A network slice instance may be fully or partly, logically and/or physically, isolated from another network slice instance. The resources comprises of physical and logical resources. A Network Slice Instance may be composed of Sub-network Instances, which as a special case may be shared by multiple network slice instances. The Network Slice Instance is defined by a Network Slice Blueprint. Instance-specific policies and configurations are required when creating a Network Slice Instance. Network characteristics examples are ultra-low-latency, ultra-reliability etc. 6 omniran-16-0071-01-CF00
NGMN Definitions, cont. Network Slice Blueprint: A complete description of the structure, configuration and the plans/work flows for how to instantiate and control the Network Slice Instance during its life cycle. A Network Slice Blueprint enables the instantiation of a Network Slice, which provides certain network characteristics (e.g. ultra-low latency, ultra- reliability, value-added services for enterprises, etc.). A Network Slice Blueprint refers to required physical and logical resources and/or to Sub-network Blueprint(s). Sub-network Instance: A Sub-network Instance comprises of a set of Network Functions and the resources for these Network Functions. The Sub-network Instance is defined by a Sub-network Blueprint. A Sub-network Instance is not required to form a complete logical network. A Sub-network Instance may be shared by two or more Network Slices. The resources comprises of physical and logical resources. 7 omniran-16-0071-01-CF00 NGMN Definitions, cont. Sub-network Blueprint: A description of the structure (and contained components) and configuration of the Sub- network Instances and the plans/work flows for how to instantiate it. A Sub-network Blueprint refers to Physical and logical resources and may refer to other Sub-network Blueprints.
Physical resource: A physical asset for computation, storage or transport including radio access Network Functions are not regarded as Resources. Logical Resource: Partition of a physical resource, or grouping of multiple physical resources dedicated to a Network Function or shared between a set of Network Functions. Network Function (NF): Network Function refers to processing functions in a network. This includes but is not limited to telecom nodes functionality, as well as switching functions e.g.Ethernet switching function, IP routing functions VNF is a virtualized version of a NF. 8 omniran-16-0071-01-CF00 Adapting NGMN network slicing to IEEE 802 IEEE 802 knows about two forms of virtual network infrastructure, i.e. Virtual network, i.e. VLAN It defines an instance of a multipoint link (Layer 2 forwarding domain).
Virtual networks exist without network virtualization. Virtualized access networks It defines an instance of an access network with its dedicated ANC and NMS. The CIS is a network entity shared among multiple virtualized access networks. An virtualized access network may comprise multiple virtual networks. 9 omniran-16-0071-01-CF00 Basic concepts of IEEE 802 network slicing Virtualized AN Instance: a virtual instance of an access network with its own ANC and NMS serving a number of NAs and BHs. Virtualized AN Template: an abstract description (data model) of a particular design of an access network, which can be instantiated multiple times. Sub-network instance: a (service provider) VLAN, which may carry further (customer) VLANs. Deployment of provider bridging with S-VID and C-VID
Network Function: according to NGMN definition either NA or BH 10 omniran-16-0071-01-CF00 After clarification of the meaning of network virtualization, the basic principles of network instantiation should be captured on slides. THE FOLLOWING SLIDES ARE FOR REVISION 11 omniran-16-0071-01-CF00 Scope and Purpose Access network instantiation describes the process to create in virtualized environments: New access network instances New network elements Coordination and Information Service
Network Management Service R10 R11 R2 R4 Access Network Control TEC R8 Terminal Interface R1 Terminal
Subscription Service R7 R5 NA R6 Backhaul R9 R3 Access Network R12 ARC Access Router Interface
Access Router Elements created by instantiation ANC => new access network NA, BH => new network elements 12 omniran-16-0071-01-CF00 Out of scope Access network instantiation does not cover: Instantiation of new CIS, NMS, SS, AR If virtualized, such instances are created by external means However, same orchestrator may provide computing resources. Network initialization procedures will follow instantiation As described in chapter 7.1.4 Amendments to the NRM NRM describes stationary instance of access network
13 omniran-16-0071-01-CF00 Roles Access Network Operator Infrastructure Provider Instantiation Orchestrator Orchestrator BSS/OSS BSS/OSS Coordination and Information Service R2
R11 R10 R8 Terminal Interface R1 User Subscription Service Network Management Service R4 Access Network Control TEC
Terminal Service Provider R7 R5 NA R6 Backhaul Access Network R9 R3 R12 ARC Access Router
Interface Access Router IP Provider 14 omniran-16-0071-01-CF00 Use case #1 Instantiation of a new access network Access network operator creates new instance of NMS Access network operator requests from orchestrator new instance of access network Orchestrator instantiates an ANC and provides identity information back to access network operator Access network operator assigns AN instance to its NMS Access network operator initializes new Access Network through its NMS Question: New Access Network by initial instance of ANC, or through record of ANCs, NAs and BHs ? 15
omniran-16-0071-01-CF00 Use case #2 Adding new instances of NA or BH to an access network Access network operator requests from orchestrator new instances of NA or BH Orchestrator instantiates requested NAs or BHs and provides identity information back to access network operator Access network operator assigns NA and BH instances to the NMS of the access network Access network operator initializes new NAs and BHs by way of ANC through its NMS Question: By which way are new network elements requested? Directly to orchestrator or by way of ANC? 16 omniran-16-0071-01-CF00 Use case #3 Removing instances of NA or BH from an access network
Access network operator tears down NAs and BHs by way of ANC through its NMS Access network operator requests from orchestrator removal of NAs and BHs Orchestrator removes instances of impacted NAs or BHs based on the identity information provided by the access network operator Question: By which way are network elements removed? Directly to orchestrator or by way of ANC? 17 omniran-16-0071-01-CF00 Use case #4 Removal of an access network Access network operator tears down access network by way of its NMS Access network operator requests orchestrator to remove instance of access network Orchestrator removes all NAs and BHs of Access Network according to identity information provided by access network operator Orchestrator removes ANC of impacted access network.
Question: Signaling of removal directly to orchestrator or by way of ANC? 18 omniran-16-0071-01-CF00 Conclusion The slides present initial thoughts on network instantiation. A couple of open questions have to agreed before progressing the specification text. Clarification of role of NMS = interface into OSS/BSS of access network operator Access Network identity and role of ANC? Message flows between access network operator (= NMS ??) and orchestrator? Any additional comments or recommendations ? 19
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