VoLTE with OpenEPC and OpenIMS

Transcription

1 VoLTE with OpenEPC and OpenIMS Core Network Dynamics GmbH A German Engineering Software Company registered in Berlin info@corenetdynamics.com Huttenstraße 34/35, Berlin, Germany tel: + 49 (0) fax: + 49 (0)

2 VoLTE Motivation

3 Voice-over-LTE VoIP on the Mobile network by the operator, using the native dialer, with your phone number as your id. It is called VoLTE Operators are offering it O2 (April 2015) Vodafone (May 2015) T-Mobile (Jan 2016) The VoIP platform is called IMS

4 Advantages for the end user Ultra fast call setup time Battery consumption HD-Voice Native dialer and transparent to the user Reachability (compared to VoIP apps) 4 6 April 2017 By Swisscom

5 VoLTE: What s behind it? IR.92 IMS Requirements EPC Requirements Radio Requirements RoHC DRX QCI 1, 5, 8/9 Supplementary Services Mobile Phone Requirements 5 6 April 2017

6 VoLTE with CND Technology 6 6 April 2017

7 OpenIMS and OpenEPC Open Source IMS Core Started in 2004 First PoC implementation à lots of lessons learned Open Source GPL Initially drive was NGN Performance Benchmark Through openness and community evolved into reference Kamailio The OpenIMS Framework 16 years of development and community Used for carrier-grade VoIP The fastest and most flexible SIP Proxy Sister-framework of Wharf/OpenEPC Module re-usability Familiarity and easy adoption curve for developers OpenEPC Started in 2008 before EPC was a standard 100 Man-Years of R&D at Fraunhofer FOKUS Not Open Source, but Source Code can be licensed GPL-free Wharf The OpenEPC Framework Inspired from SER (aka OpenSER/Kamailio) Specifically designed for SDN and NFV All protocols for 2G/3G/LTE/WiFi Fast development with code generators and builtin debugging Small code-base (~1M lines of code + ~1M lines of generated code) Small footprint Optimized for: Asynchronous processing of CP for ultimate signaling performance Run-to-completion for solid cross-platform/notoptimized UP performance Support for DPDK (soon also ODP) for ultimate UP performance 7

8 8 6 April 2017 Making VoLTE work

9 OpenEPC 7 Complete EPC Componentized Using 3GPP Standards also internally Components can be mixed and matched with 3rd party elements 9 6 April 2017

10 OpenIMS interfaces to OpenEPC April 2017

11 Kamailio-IMS VoLTE setup Configuration Domain names as in standard Switch to TCP Authentication No AKA because of missing IPSec Using now just EPC security Voice Call Rx interface from P-CSCF Mandatory Upgrade 3GPP Rel.7 to 12/13 needed Messaging Interfacing with OpenEPC IP-SM-GW, SMS-Router, etc Latest Diameter-centric delivery concepts, SIP / SIGTRAN at the edges 11 6 April 2017

12 OpenEPC VoLTE setup Configuration Setup well-known APN (IMS) QoS QCIs PCOs with P-CSCF address and indication of Voice over PS USIM + ISIM provisioning Setup Deploy common HSS Deploy PCRF (QoS) Deploy IP-SM-GW, SMS- Router (SMS) 12 6 April 2017

13 The Phones VoLTE is supported in the baseband/firmware but only for pre-configured networks We did nothing to the phones! Hundreds of phones support VoLTE But only a handful of chipsets 13 6 April 2017 iphone (ios 9.3.1) USIM/ISIM Dedicated Bearer Qualcomm MDM9625/MDM 9635 Samsung Galaxy S7 ISIM Different chipset, similar SIP stack OnePlus 3T Unlocked Reversed behavior open by default Fast attach

14 VoLTE and VoWiFi AF/IMS Rf HSS Sp PCRF Rx Gx PDN Gi/SGi PGW Ro Gz/Rf Gy/Ro OFCS OCS Common EPC&IMS Core Gxx Gxx MME S11 S1- MME SGW S1-U enodeb TWAG WiFi AP epdg IPsec Srv Specific RAN LTE WiFi Internet 14 6 April 2017 VoLTE with QoS UE VoWiFi without QoS

15 Quality of Service Key difference between VoLTE and VoIP is the usage of QCI 1 (GBR) for voice connection Setup of QCI 1 bearer requires a PCRF and interaction between IMS and EPC (Rx/Gx) HSS Sp PCRF Gxx Rx Gxx Gx AF/IMS PDN Gi/SGi PCEF PGW Rf Ro Gz/Rf Gy/Ro OFCS OCS Using OpenEPC 7 PCRF optimized for VoLTE SGW TWAG BBERF epdg BBERF 15 6 April 2017

16 NFV VoLTE Deployment OpenIMS and OpenEPC can be deployed virtualized on OpenStack Both comply with ETSI NFV standard architecture and use OpenBaton, an Open Source VNFM, NFVSO and EMS Support for initial deployment, configuration, scaling in/out, autoscaling components based on load Orchestration with VMs and Containers 16 6 April 2017

17 VoWiFi Same as VoLTE, but no QoS Seamless support in OpenEPC for non-3gpp access 3GPP Rel.12 PGW auto-detects clients Single-radio vertical ho. with seamless mobility Multi-access IP Flow Mobility (IFOM) for parallel WiFi and LTE TWAG trusted WiFi access SIM card authentication WPA-EAP-AKA/AKA epdg Internet access SIM card authentication IPSec for security S5/S8/S2a TWAG BBERF WiFi AP S5/S8/S2b RADIUS EAP WiFi PDN PGW Internet S6b epdg BBERF IPsec Srv Untrusted STa RADIUS EAP AAA-Srv AAA-Pxy SWm SWd SWx SWa HSS UE 17 6 April 2017

18 Support for CS-services OpenEPC takes innovative approach OpenIMSCore as core platform For 2G/3G clients GSM-L3 to IMS translation Standard VoLTE/VoWiFi Looks like IMS Centralized Services Single Core Network generations fits all Base Stations, including legacy 18

19 VoLTE Roadmap Kamailio Upgrade to Release 12 of 3GPP CSCFs with ultimate performance, scalability and flexibility TAS, MMTel-AS, SCC-AS, etc Security: IPSec / TLS OpenEPC ICS Extension of MSC Directly emulating IMS UEs when connected on 2G/3G SRVCC easy, much simplified due to ICS CSFB part of OpenEPC 7 VoWiFi (testing ongoing) Interfacing with legacy networks vhlr USSI/USSD 19 6 April 2017