Title: Tektronix LTE Solutions
1Testing Next Generation Networks 3G to 4G The
Core Infrastructure Revolution and the impact on
IMS
Broadband Communication Technology May 2008
Bernd Wessling, Application Engineer, Tektronix
2Testing Next Generation Networks From IMS to LTE
- Testing 4G Networks
- Testing of IMS Server Systems
- Testing LTE Core Networks (SAE)
- 4G Network Test Strategy The Big Picture
3Testing 4G Networks General Guidelines
- 4G technologies (WiMAX, LTE) are still rapidly
changing - Staying close to industry forums and
standardization bodies remains key - TTCN-3 support of 3GPP, WiMAX Forum
- Industry led test initiatives attempt to
accelerate 4G technologies - LTE Field Trial Initiative
- NGMN
- IMS Forum
- Multi-Service-Forum (MSF)
- WiMAX Forum
4Testing 4G Networks4G Core Networks
- 4G Core Networks need to evolve with the
deployment of 4G Access Technologies (LTE, WiMAX)
- LTE transmits 100MBit/s per cell one single
six-cell eNodeB can transmit up to 600MBit/s into
the core network! - WiMAX transmits 40MBit/s per cell one single
six cell WiMAX Base Station can transmit up to
240MBit/s into the core network! - Circuit Switched connections do not exist anymore
all transport is IP based XoIP! - QoS mechanisms need to function well otherwise
real time critical services (voice, video) will
have problems - Core network will go All-IP Carrier-grade,
five-9 reliable IP network needs to be deployed - IP based End-to-End Security Mechanisms will be
introduced (IP-Sec)
5Testing 4G Networks4G Core Networks
- Testing 4G Core Networks
- Extreme load levels require next generation probe
systems and new data reduction algorithms (real
time data mining) - Due to the different, sophisticated services with
varying transport requirements (real time
criticality) user plane testing is taken to the
next level - In-band QoS mechansims
- Application based switching /routing
- Service specific KPIs, etc.
- XoIP networks have very different operating
characteristics. New sets of KPIs, which
correlate with actual operational state of the
network need to be defined, tested and
implemented - New end-to-end security methods (IPSec based
authentication and ciphering) complicate
management, analysis and troubleshooting - IMS based services will replace proprietary
service delivery platform
6Testing 4G Networks4G Core Networks
- IMS Network Properties Relevant for Testing
- IMS Architecture introduces standardized
interfaces for the 4G core network interfaces
UNI, NNI and Application Server Interface - Introduction of advanced security, billing and
registration mechanisms - Support for complex integrated services
- Testing IMS Networks
- Comprehensive interoperability testing at P-, I-,
and S-CSCF interface - Backwards interoperability with Early-IMS, SIP,
Proprietary Core - Comprehensive security, billing and registration
testing - Functional Load testing for new services POC,
Location, Presence
7Testing Next Generation Networks From IMS to LTE
- Testing 4G Networks
- VI Testing of IMS Server Systems
- Testing LTE Core Networks (SAE)
- 4G Network Test Strategy The Big Picture
8VI Testing of IMS Server Systems
- Key for success in IMS is
- Conformance to IMS transport, security, AAA and
service protocols - Proven interoperability with existing IMS
implementations - Proven interoperability with IMS service
applications - Proven interoperability with IMS terminals
- Performance of IMS implementations
- Required Test Scenarios are comprehensive and
complex - Authentication
- Registration
- Call/Session Setup
- Call/Floor Control
- Media Authorization
- Media Transport
- PDP Context Management
- Configuration/GM
-
9IMS Standardization 5 Segments with different
interest areas and focus
VI Testing of IMS Server Systems
Which Standard?
1
OMA
GSMA
3GPP
IETF
ITU SG9 (IPCableCom)
DSLWiFI
3
2
Corba
CMTS (WiMAX)
OSA
ITU SG11NGN
CableLabs (Private company industry
consortiumbut own standards)
TISPAN
Parlay
Jain
Public Internet (Meshed Networks/ Client Centric
Approach)
ECMA (ETSI)Next Generation Corporate Networks
4
5
10VI Testing of IMS Server Systems
- Use Case 1 Pure IMS test
- Tester focused on the IMS domain
- Enables functional and load testing of IMS
network elements and subsystems - Use Case 2 End-to-end test
- Covers complete mobile network
- Includes UE, mobile access network (e.g. UTRAN)
and CS/PS core network - Impact of access network parameters on IMS
services can be tested - Enables end-to-end QoS testing
Option 2
Option 1
IMS Enabling Services
IMS Core Functions
CS/PS Core Network
Access Network
11VI Testing of IMS Server SystemsIMS Test Suite
NNI Test Cases
UNI Test Cases
12Testing Next Generation Networks From IMS to LTE
- Testing 4G Networks
- VI Testing of IMS Server Systems
- Testing LTE Core Networks (SAE)
- 4G Network Test Strategy The Big Picture
13LTE/SAE System Test Architecture
(1) Interface based on GTP
Gb
Iu
(1)
S3
S4
Rx
(1)
S6a
S7
PDN SAEGateway
HPLMN
S11
VPLMN
S1_MME
Serving SAEGateway Local non 3GPPAnchor
SGi
S8b
S1_U
S2b
Evolved Packet Core
S2a
WLAN AccessNetwork
WLAN 3GPP IP Access
Source 3GPP TR 23.882 v1.6.1
14LTE SAE Test Challenges
- General Test Requirements
- 2.5G/3G Interworking regarding MM Scenarios such
as Multi-RAT HO, Cell Selection/Re-Selection - Interworking with Non 3GPP IP Access (e.g. WiMAX)
and WLAN 3GPP IP Access - IP-Service Domain Interworking (e.g. IMS)
- QoS Handling/Management
- Protocol Monitoring correlating multiple
interfaces (S1, X2, S3, Iu, Gb,) - Interoperability Testing
- Multi-Technology (LTE ltgt GSM, GPRS, UMTS, WiMAX)
- Multi-Vendor
- System Integration
- Performance Verification and Test
- High performance tests for network nodes, such
e-NodeB and MME/UPE - Multi-Technology
- Multi-Vendor
15Testing Next Generation NetworksFrom IMS to LTE
- Testing 4G Networks
- VI Testing of IMS Server Systems
- Testing LTE Core Networks (SAE)
- 4G Core Network Test Strategy The Big Picture
164G Network Test StrategyThe Big Picture
- Stay close to test initiatives, plug-fests, field
trial initiatives and standardization bodies - Build IP Test Expertise to achieve Five9 IP
reliability - Develop XoIP test concepts
- Create and implement a 4G Core Network Test
Strategy - Prepare for 10x load levels
- Implement working load balancing / QoS
mechanisms - Develop relevant KPIs reporting actual
network/service performance - Prepare for managing in secure, Ipsec protected
environment - Prepare migration to standardized IMS based
service deployment infrastructure
17Unmatched Expertise, Unparalleled Portfolio
Thank You
- Test Solutions from Tektronix