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OpenAirCN-5G Project Current Activities Olivier CHOISY, b<>com Michel TREFCON, b<>com Luhan WANG, BUPT Tien-Thinh NGUYEN, EURECOM

OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

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Page 1: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

OpenAirCN-5G Project Current Activities

Olivier CHOISY, b<>comMichel TREFCON, b<>com

Luhan WANG, BUPTTien-Thinh NGUYEN, EURECOM

Page 2: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoA prototype Implementation

Roadmap

Demo

Demo

Page 3: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Introduction

Open Air Interface Software Allianceo Core Network Software

• Rel10/Rel14 Implementation• With ongoing development/maintenance

Initiative to start a 5G Core Implementationo Objectives :

• Initiative to provide an Open source implementation of 5G Core Network as specified by 3GPP• Build a community to perform this implementation

How ?o New Software implementation (5G Skeleton then NFs)o Partners : Eurecom, b<>com, BUPT, Blackent, ng5T

Page 4: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Introduction

Preliminary work (Eurecom/BUPT) Q3-2017o HTTP/2, 5G SBA bus, … initial prototype

Initial workshop to start officially : 04/03/2018 (b<>com Paris)o Decision to start with a complete skeleton based on SBI/SBA 3GPP specifications

(TS23.5xx,29.5xx)

4 synchronization meetings with partners

Trello project follow-up

Progressive implication from partners expected

Q3/Q4 : initial SBA Interfaces implementation – on going

Page 5: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoPrototype Implementation

Roadmap

Demo

Demo

Page 6: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5G – Service Trends and Usage Scenarios

Page 7: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Service-Oriented 5G Core Network

Next Generation Network: To meet the needs of the range of services envisioned for 5G, with diverse performance requirements, across a wide variety of industries: Flexible, Scalable, and Customizable

Service Based Architectureo support a modularized service, flexible and adaptable, with fast

deployment cycles and updates for launching services on demand in the network

o a set of NFs providing services to other authorized NFs to access their services

Page 8: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5G System Architecture Access and Mobility Management

Function (AMF) Session Management Function (SMF) User plane function (UPF) Policy Control Function (PCF) Authentication Server Function (AUSF) Unified Data Management (UDM) Network Exposure function (NEF) NF Repository function (NRF) Network Slice Selection Function (NSSF) Service based interfaces (SBI):

Namf, Nsmf, Nudm, Nnrf, Nnssf, Nausf, Nnef, Nsmsf, Nudr, Npcf

5G System Architecture (3GPP TS23.501)

Page 9: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5G System Architecture 5G System Architecture in reference point representation (non-

roaming scenario) (3GPP TS23.501)

Page 10: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Core Network : From 4G to 5G Networks

MME: Mobility Management Entity SGW: Serving GatewayPGW: Packet Data Network (PDN) GatewayPCRF: Policy and Charging Rules Function

HSS: Home Subscriber Server

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Service Based Architecture Network Function (NF) Service Framework (3GPP TS 23.501)

o Interactions between NF Service Consumer and NF Service Producer: Request-Response, Subscribe-Notify

o NF service authorizationo NF service registration, de-registrationo NF service discovery

Interactions between NF Service Consumer and NF Service Producer

Request-Response interaction Subscribe-Notify interaction

Page 12: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Service Based Architecture– NF Service Framework

HTTP methods - Request/Response communication (CRUD)o Create/Read/Update/Delete a resource

Read a resource using HTTP GETCreate a resource using HTTP POST

Update a resource using HTTP PUT Delete a resource using HTTP DELETE

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Service Based Architecture– NF Service Framework

HTTP methods - Subscribe/Notify communicationo Notifications will be sent to NF Service Consumer when the change/event occurs at the Service

Provider (Provider ~ Client, Consumer ~ Server)o Create/Modify/Delete subscriptions using HTTP POST, PUT/PATCH, DELETE

Create a subscription using HTTP POST Send a notification using HTTP POST

Modify a subscription using HTTP PUT Delete a subscription using HTTP DELETE

Page 14: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Service Based Architecture – NF Service Framework

NF service registrationo NF instance informs the NRF the list of NF

services that it supports e.g., during NF instance registration/activation

o NF service de-registrationo Deregistration with the NRF due to

specific events e.g., NF instance shutdown/disconnect or errors

NF Registration procedure

NF de-registration procedure

Page 15: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Service Based Architecture – NF Service Framework

NF service discovery (relying on NRF)o To be discovered by NRF, the requested NF

instance needs to be registered in the NRF

NF service status subscribe/notify o Subscribe to be notified of new

registered/updated/deregistered NF instances

Page 16: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5GC Components - AMF Four services (3GPP TS23.501; 3GPP TS23.502; 3GPP TS29.518)

o Namf_Communication service - Enables an NF consumer to communicate with the UE and/or the AN through the AMF

o Namf_EventExposure service - Enables other NF consumers to subscribe or get notified of the mobility related events and statistics

o Namf_MT service - Enables an NF consumer to make sure UE is reachableo Namf_Location service - Enables an NF consumer to request location information for a target UE

NF Consumers (Table 5.2.2.1-1,3GPP TS23.502) Namf_Communication Service (3GPP TS29.518)

o Function: Enables an NF to communicate with the UE through N1 NAS messages or with the AN (both UE and non UE specific)

o Operations : UEContextTransfer; CreateUEContext; ReleaseUEContext; RegisterationCompleteNotify; N1MessageNotify; N1MessageSubscribe; N1MessageUnSubscribe; N1N2MessageTransfer; N1N2TransferFailureNotification; N2InfoSubscribe; N2InfoUnSubscribe; N2InfoNotify; EBIAssignment; AMFStatusChangeSubscribe; AMFStatusChangeUnSubscribe; AMFStatusChangeNotify

o Operation Parameters (in & out) (clause 5.2.2.2, 3GPP TS23.502)o Resource URLs and HTTP Method (Table 6.1.3.1-1 , 3GPP TS29.518)o Usage of each operation (clause 5.2.2, 3GPP TS29.518)

Other AMF services’ detailed information also can be found in 3GPP TS29.518

Page 17: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5GC Components - AMF Different from EPC in interface protocol

MME HSSs6a

AMF SMF

AUSF UDM

SBI

DiameterSCTP

IPL2L1

s6a protocol stack

HTTP/2TCPIPL2L1

SBI protocol stack

➢ MME corresponds to AMF and SMF➢ HSS corresponds UDM and AUSF➢ Interface s6a turns into SBI

➢ Protocol stack changes from Diameter to HTTP/2

Page 18: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

5GC Components – SMF, UDM, AUSF, PCF, NRF SMF

o TS29.502 - Session Management Services, Stage 3, Rel 15.1.0, 2018-09o TS29.508 - Session Management Event Exposure Service, Stage 3, Rel 15.1.0, 2018-09

UDM: o TS29.503 - Unified Data Management Services, Stage 3, Rel 15.1.0, 2018-09

AUSF: o TS29.509 - Authentication Server Services, Stage 3, Rel 15.1.0, 2018-09

PCFo TS29.507 - Access and Mobility Policy Control Service, Stage 3, Rel15.1.0, 2018-09o TS29.512 - Session Management Policy Control Service, Stage 3, Rel 15.1.0, 2018-09

NRF: o TS29.510 - Network Function Repository Services, Stage 3, Rel 15.1.0, 2018-09

Page 19: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoA prototype Implementation

Roadmap

Demo

Demo

Page 20: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Current Activities

Initiate some Project Coordination (trello) and regular meetingso Project Structureo Different Languages target : Cplusplus, Java

Needs Partners to be involved in Design and implementation

b<>com activities

(shared on git : https://github.com/OPENAIRINTERFACE/openair5g-cn )o 3GPP Specification follow upo Identification of APIs and data models per NFo NFs Interface APIs and Code generation for interfaces

Page 21: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoA prototype Implementation

Roadmap

Demo

Demo

Page 22: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

SBA Skeleton objective Activities

Automatic source code generationo Evaluate tools, o define a process based from 3GPP Yaml

5GC API AMF and NRF focus

Software environment

Feedbacks

Next steps

Page 23: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

openapi-generatorautomatic source code generation toolOpenAPITools/openapi-generator open source project can be used

o from CLIo as a maven or gradle plugin

can generate source code for server and client sides 1 or 2 releases per month Template files can be customized Extensible : open for new generators Current used version is 3.3.3 started with version 3.1.0 (June 2018)

Page 24: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

3GPP 5GC API

Yaml filesextracted from TS files and put under SCM

AMF

MT, Location, EventExposure and Communicationo started with R15.0.0 and upgraded to R15.1.0o REST facades available with restrictions

NRF

NFManagement, NFDiscovery and OAuth2o NFManagement REST facade available with restrictionso NFDiscovery ongoingo OAuth2

Page 25: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Software Environment

OpenAPITools/openapi-generatorCurrent used version is 3.3.3 (started with 3.1.0)

Java environmento java8o jaxrs/resteasy (server side)o maven 3.5.xo thorntail 2.2.0 (started with 2018.5.0)

uberjar file to be run on CLIHTTP/2 enabled

C++ o Pistache framework (server side)o cpprest-sdk LIB (client side)o C++11, GNU g++ 5.4.0, cmake, make

miscswagger-ui : visualize and interact with the API’s resources (Web App)

Page 26: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Process Overview

3GPPTS

3GPP yaml

source codegenerator

github://OpenAPI generator

Java

CPP

clientserver businesslogic

NFi

NFi

auto generatedsource code

proprietarysource code

issuespull requests new release

Page 27: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Feedback Overview

RESULTS

REST facade source code fully generated from yaml files.o 1st implementations in Java & C++ serve responses

with random values based on their types and value constraints (range constraints, regex)o serving error responses (ProblemDetails) on not valid content receipt (malformed json body,

invalid type values, constraint violation...)

Work to do is to add business logic on top of the generated skeleton.

RESTRICTIONS

Need to update 3GPP yaml files because of openapi generator restrictionso $ref path must start with ./o not fully OpenApi 3.0 compliant (anyOf, allOf, OneOf & callbacks)o rewrite definitions to get around generator issues

Page 28: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Feedback OpenAPITools/openapi-generator Pros

o active community with many contributors and regular deliveries (monthly basis).o lot of source code generators (Java, C++, Python, Go, … etc)o good documentationo customizableo extensible

Conso Currently not fully compliant against OpenAPI 3.0

Doesn’t yet support anyOf/oneOf/allOf (work in progress in the open source community) & callbacks

o Issues may occur (from most serious to least serious)• at source code generation stage (exception)• at compilation time (generated source code doesn’t compile)• at runtime (expected feature may not work - e.g. bean validation for

java/jaxrs/resteasy)o OpenAPI compliance and issues can depend on generator family

Page 29: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

3GPP TS Release “Migration”

3GPP specification changes impact the current source code base.

From R15.0.0 to R15.1.0 (Sept release)o compilation failures

• new interfaces to implement• removed attributes

o test issues• value constraints updated

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Next Steps

Javao HTTP2 cliento unit and integration tests

C++o HTTP2o unit and integration tests

Software environmento update of software components (OpenAPITools generator, thorntail, C++ librairies etc)

benefits are bug fixes and new features.o need no regression tests with good coverage rate

Page 31: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

DEMO

Demo

Page 32: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoA prototype Implementation

Roadmap

Demo

Demo

Page 33: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

A prototype implementation

Related workso stage one - SBI implementation based on nghttp2.0 library in OAIo stage two - A simple 5G Core demo with python flask framework

Capsulate Nghttp2.0 library to implement REST APIo What’s nghttp2.0 library? - C implementation of HTTP/2 protocolo How to implement REST API?

• Parse HTTP METHOD from “:method” header frame in function “on_header_callback”• Parse Resource URI from “:path” header frame in function “on_header_callback”• Parse data payload from from data frame in function “data_recv_callback”• REST API example - DELETE https://127.0.0.1:5001/namf-comm/v1/ue-contexts/1234

o Work in OAI? - Integrate nghttp2.0 into OAI, separate MME into ESM and EMMo Evaluated the SBI performance(2018 ICC)Title - “Performance Evaluation of Candidate Protocol Stack for Service-based Interfaces in 5G Core Network”

Page 34: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

A Prototype ImplementationA simple 5GC demo developed with python flask framework

What’s the purpose? o Develop a 5G Core framework, which shows how service-based 5G Core workso Implement simple NFs, which shows how service-based NFs work and what difference with EPC NFso Simulate UE Registration Management Procedure and UE Triggered Service Request Procedure, which shows how 5G

System Procedures worko This work shows how to follow 3GPP specifications to develop 5G NFs

Disadvantages?o This demo just implements part of 5GC

✓ parts of 5GC NFs - AMF, SMF, UDM, AUSF and UPF✓ A few system procedures - UE Registration Management Procedure and UE Triggered Service Request Procedure

o some don’t follow 3GPP specification× N2, N3 and N4 protocol× Simplified message parameters× HTTP version is v1.1 - because python flask doesn’t support HTTP/2

Overview of the prototypeo What python flask framework look like? - one example from source codeo Two procedures implementation - Registration & Service Requesto Test scenario and explanationo Video

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A Prototype ImplementationFramework (python-flask)

➢ __init__.py - setting of listening port and default url prefix

➢ api folder - all service endpoints ➢ routes.py - Mapping of Resource

class and its url

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A Prototype ImplementationRegistration Management Procedure

UE (R)AN AMF SMF AUSF UDM

1.Registration Request

2.AMF selection

3.Registration Request

4.Authentication/Security

5a.Nudm_UECM_Registration

5b.Nudm_SDM_Get

5c.Nudm_SDM_Subscribe6.Registration Accept

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A Prototype ImplementationUE Triggered Service Request Procedure

UE (R)AN AMF UPF SMF

1.Service Request

2.N2 message(Service Request)

3.Nsmf_PDUSession_UpdateSMContext Request

4a.N4 Session Establishment Request

4b.N4 Session Establishment Response

5.Nsmf_PDUSession_UpdateSMContext Response

6.Uplink data

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A Prototype ImplementationTest Scenario

Implementation of NFso AMF - Connection & Registration managemento SMF - PDU Session managemento UDM - database management(use mysql database in HSS,EPC)o AUSF - Authentication centero UPF - configure UP o VM - simulated UE+AN Deploymento Five NFs are deployed in physical hosto UE+AN are deployed in a VM Message Patho signaling message path (red line)o data flow (green line)(not be established initially) Testo After VM(UE+AN) finishes CM,RM and PDU Session

management procedureso Then UPF configure UP for date flow(green line being

established)o Finally,VM can communicates with host via green line data path

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A prototype Implementation

39

Demo

Demo

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Outline

Introduction to OAI CN 5G project Introduction to 5G Core NetworkCurrent activitiesoMeetings, discussion between partnersoCode generation for interfacesoA prototype Implementation

Roadmap

Demo

Demo

Page 41: OpenAirCN-5G Project Workshop-v8 - ETSI · ñ' } u } v v r D& & } µ À ] ~ ï'WW d^ î ï X ñ ì í V ï'WW d^ î ï X ñ ì î V ï'WW d^ î õ X ñ í ô o E u ( z } u u µ v

ROADMAP

Benefit from python based « Prototype implementation » Additional Partners to speed up implementation Structure Project

o Gito Continuous Integrationo Tests Tools

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ROADMAP

Core NFs interface available (Java,Cplusplus) : o AMF (Java, cplusplus), NRF(java) : Q4 2018o SMF, AUSF (?) : Q1 2019

Implementation of main functions of NRF : Q1 2019 Implementation of a use case (simplified) as UE attach : Q2 2019

o NRF registry from AMFo AMF attach with proxy to 4G HSS, SMF (?)

HELP WELCOME !

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BACKUP

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Current Status of 3GPP Specifications

5G System TS23.501 - System Architecture for the 5G System, Stage 2, Rel 15.3.0, 2018-09 TS23.502 - Procedures for 5G System, Stage 2, Rel 15.3.0, 2018-09 TS29.500 - 5G System, Technical Realization of Service Based Architecture, Stage

3, Rel 15.1.0, 2018-09 TS29.501 - 5G System, Principles and Guidelines for Services Definition, Stage 3,

Rel 15.1.0, 2018-09

5GC components AMF: TS29.518 - Access and Mobility Management Services, Stage 3, Rel 15.1.0,

2018-09: AMF Communication Service, AMF Event Exposure Service, AMF Location Service, AMF Mobile Termination Service

NRF: TS29.510 - Network Function Repository Services, Stage 3, Rel 15.1.0, 2018-09: NRF NF Discovery Service, NRF NF Management Service

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Current Status of 3GPP Specifications SMF TS29.502 - Session Management Services, Stage 3, Rel 15.1.0, 2018-09: SMF

PDU Session Service TS29.508 - Session Management Event Exposure Service, Stage 3, Rel 15.1.0,

2018-09 UDM: TS29.503 - Unified Data Management Services, Stage 3, Rel 15.1.0: Event

Exposure Service, Parameter Provision Service, Subscriber Data Management Service, UDM UE Authentication Service, Context Management Service

AUSF: TS29.509 - Authentication Server Services, Stage 3, Rel 15.1.0, 2018-09 PCF

TS29.507 - Access and Mobility Policy Control Service, Stage 3, Rel15.1.0, 2018-09

TS29.512 - Session Management Policy Control Service, Stage 3, Rel 15.1.0, 2018-09

– TS29.571 - Common Data Types for Service Based Interfaces, Stage 3, Rel 15.1.0, 2018-09

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Detailed NF information in specifications (SMF)

Two services (3GPP TS23.501; 3GPP TS23.502) Nsmf_PDUSession service - manages the PDU Sessions; uses the policy and charging rules

received from the PCF Nsmf_EventExposure service - exposes the events happening on the PDU Sessions to the

consumer NFs

• NF Consumers (Table 5.2.8.1-1,3GPP TS23.502)• Nsmf_PDUSession Service (3GPP TS29.502)

– Function? - Operates on the PDU Sessions (Creation / Deletion / Modification of AMF-SMF interactions for PDU Sessions)

– Operations : Create; Update; Release; CreateSMContext; UpdateSMContext; ReleaseSMContext; SMContextStatusNotify; StatusNotify; Context

– Operation Parameters (in & out) (clause 5.2.8.2, 3GPP TS23.502)– Resource URLs and HTTP Method (Table 6.1.3.1-1 , 3GPP TS29.502)– Usage of each operation (clause 5.2.2, 3GPP TS29.502)

• Nsmf_EventExposure service’s detailed information also can be found in 3GPP TS29.502

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Detailed NF information in specifications (SMF)

Different from EPC in interface protocol

MME SGWs11

SMF UPFN4

➢ MME corresponds to AMF and SMF➢ UPF can be understood as part of the SGW data plane➢ Interface s11 turns into N4➢ UDP Port number changes from 2123 to 8805(detail see

3GPP TS29.244)GTP-CUDP

IPL2L1

s11 protocol stack

GTP-UUDP

IPL2L1

N4 protocol stack➢ Protocol stack changes from GTP-C to GTP-U(detail see 3GPP

TS29.244 )

2123 8805

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Detailed NF information in specifications (UDM)

Five services (3GPP TS23.501; 3GPP TS23.502; 3GPP TS29.503) Nudm_SubscriberDataManagement service - Allow NF consumer to retrieve user subscription data when

necessary; Provide updated user subscriber data to the subscribed NF consumer Nudm_UEContextManagement service - Provide infomation related to UE’s transaction information; Allow

NF to register and deregister its information for the serving UE in the UDM; Allow NF to update UE Context information in the UDM

Nudm_UEAuthentication service - Provide updated authentication related subscriber data Nudm_EventExposure service - Allow NF consumer to subscribe to receive an event Nudm_ParameterProvision service - Provision information which can be used for the UE in 5GS

• NF Consumers (Table 5.2.3-1,3GPP TS23.502)• Nudm_SubscribeDataManagement Service (3GPP TS29.503)

– Function? – Operations : Get; Subscribe; Unsubscribe; Notification; Info– Operation Parameters (in & out) (clause 5.2.3.3, 3GPP TS23.502)– Resource URLs and HTTP Method (Table 6.1.3.1-1 , 3GPP TS29.503)– Usage of each operation (clause 5.2.2, 3GPP TS29.503)

• Other UDM services’ detailed information also can be found in 3GPP TS29.503

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Detailed NF information in specifications (AUSF)

Two services (3GPP TS29.509) Nausf_UEAuthentication service - Provide UE authentication service to the requester NF Nausf_SoRProtection service - Provide SoRProtection service protecting the Steering

Infomation List from being tampered with or removed by the VPLMN

• Nausf_UEAuthentication Service (3GPP TS29.509)– Function? - Provide UE authentication service to the requester NF– Operations : Authenticate– Resource URLs and HTTP Method (Table 6.1.3.1-1 , 3GPP TS29.509)– Usage of each operation (clause 5.2, 3GPP TS29.509)– Depending on the information provided by the AMF,AUSF enters in one of the following

procedures:

✓ 5G-AKA ✓ EAP-based authentication’• Nausf_SoRProtection service’s detailed information also can be found in 3GPP TS29.509

49

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Detailed NF information in specifications (UPF)

SMF and UPF interactions(3GPP TS23.501) N4 Node level Procedures N4 Session management Procedures Parameters for N4 session management

✓ N4 Session ID✓ Packet Detection Rules(PDR) that contain information to classify

traffic (PDU(s)) arriving at the UPF✓ Forwarding Action Rules(FAR) that contain information on whether

forwarding, dropping or buffering is to be applied to a traffic identified by PDR(s)

✓ Usage Reporting Rules(URR) that contains information that defines how traffic identified by PDR(s) shall be accounted as well as how a certain measurement shall be reported

✓ Qos Enforcement Rules(QER) that contain information related to QoS enforcement of traffic identified by PDR(s)

Features of the UPF(3GPP TS23.501) Traffic detection(e.g. classifying traffic of IP type,Ethernet type,or unstructured type) Traffic reporting(e.g. allowing SMF support for charging) QoS enforcement Traffic routing(e.g. for UL CL or IPv6 multi-homing)

N4 Session Context (including N4 SessionID; all PDRs, URRs, QERs and FARs ) Detailed information for Rules, see clause 5.8.2.11.3~5.8.2.11.6, 3GPP TS23.501

50


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