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Tektronix LTE Solutions

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... one single six-cell eNodeB can transmit up to 600MBit/s into the core network! ... Call/Session Setup. Call/Floor Control. Media Authorization. Media Transport ... – PowerPoint PPT presentation

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Title: Tektronix LTE Solutions


1
Testing 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
2
Testing 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

3
Testing 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

4
Testing 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)

5
Testing 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

6
Testing 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

7
Testing 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

8
VI 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

9
IMS 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
10
VI 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
11
VI Testing of IMS Server SystemsIMS Test Suite
NNI Test Cases
UNI Test Cases
12
Testing 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

13
LTE/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
14
LTE 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

15
Testing 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

16
4G 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

17
Unmatched Expertise, Unparalleled Portfolio
Thank You
  • Test Solutions from Tektronix
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