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LTE pre-SI Test Suite
Implementation in TTCN3: A case study
Pramod Shrivastava
Intel Mobile Communication
Nitin Bodas
Larsen & Toubro Infotech
Ranganath Mahapatra
Larsen & Toubro Infotech
1
Introduction
LTE pre-System Integration (pre-SI) test suite for testing UE modem in a simulated
environment.
Specifically designed to address IOT, field testing, inter-RAT scenarios and testing of
complex functional areas.
Implemented on a multi-mode LTE protocol stack running on a host system and
interacting with an automation framework through message queues.
The main objective of this suite was to advance the testing phase, typically carried out
at a later stage and thereby improve the overall testing process.
The test cases were developed in TTCN3.
2
UE Modem Development & Validation Phases
Protocol Layers
Physical and RF Layer
Advance Features
OS Porting & Peripherals
Pre-SI
Conformance Testing
Certification Support
Field Testing
Requirement Testing
Performance &
Stress Testing
IOT
SI
Operator Acceptance
Testing
Post-SI
Pre-SI phase: Protocol layers such as Physical Layer, L2 and L3 consisting of MAC, RRC, RLC, NAS & PDCP
layers are developed independently
SI Phase: Protocol layers (L2 &3) are integrated with physical layer, RF and other components or
modules and ported to UE modem
Post-SI Phase: the UE modem undergoes development and validation with focus on customer acceptance,
certification testing etc.
3
Incremental Development & Testing
Test Case Execution
Test Case
Development/Enhancement
Protocol Stack
Development/Enhancement
Release 8
Release 9
Release 10
Phase-1
Phase-2
Phase-3
………
Host Environment
Development
Phase-1
Phase-2
Phase-3
………
4
3GPP Releases & Features covered in the Test Suite
LTE/EPC Rel. 8
LTE FDD & TDD Interfaces
LTE FEDD & TDD Layer 1,2,3
delimitations
Security support
Mobility Features & IRAT
EPC Definition and support
EPC charging
Advanced Antenna,: MIMO, FSS
CS Fall Back
SRVCC
SON Features
Home eNB
IMS Support
LTE/EPC Rel. 9
Positioning Support
LTE in 800 MHz
NW based Positioning
IMS Emergency
Public Warning System
Home eNB
eMBMS support in LTE
Enhanced DL Transmission
Vocoder rate adaptation
SON Features
LTE/EPC Rel. 10
Bandwidth
aggregation
Relays and Repeaters
MIMO Enhancements
Multisite Cooperative
Transmission
Incremental approach to develop the stack, network emulator and test suite.
Synced up with 3GPP releases with respect to feature enhancements and addition of new features.
Test Cases categorized into complex functional, IOT, security, inter-RAT, field testing and other
functional areas.
5
Filtering of Test Cases
SI Test Cases
Complex Functional Test Cases
Field Test Cases
IOT Test Cases
GCF Test Cases
Influenced Test Cases
Pre-SI Phase 1
Pre-SI Phase 2
Pre-SI Phase 3
Non-Influenced Test Cases
6
Test Environment
Network Side Emulator
2G/3G/4G UE
System
Adaptation Layer
/ NAS
Layer 3
Pre-SI Test Suite
in TTCN-3
System
Adaptation Layer
System
Adaptation Layer
2G/3G/
L2 Layer
4G LTE
(PDCP/RLC/MAC)
L1
MAC Adaptation
Layer
AT/MMI
Commands
Layer 2
MAC Adaptation
Layer
MSG Q or UDP/IP
The test cases are executed using host based tri-mode automation framework.
It supports validation of both LTE and legacy technologies.
The framework and UE protocol stack interact with each other in message queues and also
preserves LTE frame timing.
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Sample Scenario#1
LTE
[Packet Call]
CS-FB call
UMTS
Add a bearer
End CS-FB
call
back to LTE with
both bearers.
MT Voice Call
Voice Call End
Web Browsing
CS-fall back
FTP Download
8
Sample Scenario#2
UE circulates around cells of different RATs
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Addressing Challenges
Test scenario identification is one of the key challenges in the development of the
pre-SI Test suite due to limitations and evolution of protocol stack or host
environment.
These challenges are addressed ensuring the following aspects:
Extensive knowledge of standard and release enhancements in multi RAT
context
Extensive knowledge in SI and post-SI test areas
Test coverage to replicate field or real life scenarios including negative and
concurrent scenarios etc
Test cases were converted in to message flows followed by scripting which requires
excellent understanding of the interaction between UE modem and network.
10
Conclusion
Pre-SI test suite was developed with test scenarios typically executed in SI and post-SI
phases.
The objective of this suite is to reduce multimode LTE UE development time.
The test suite is designed such that it can also be used in SI and post-SI phase on
commercial network simulator.
The suite is continually enhanced to keep in sync with the evolution of 3GPP standard.
11
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