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LTE pre-SI Test Suite Implementation in TTCN3: A case study

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  1. LTE pre-SI Test SuiteImplementation in TTCN3: A case study

  2. Introduction

  3. UE Modem Development & Validation Phases Conformance Testing Protocol Layers Certification Support Field Testing Physical and RF Layer Requirement Testing Advance Features Performance & Stress Testing Operator Acceptance Testing OS Porting & Peripherals IOT • 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. Pre-SI SI Post-SI

  4. Incremental Development & Testing Test Case Execution Protocol Stack Development/Enhancement • Release 8 • Release 9 • Release 10 • Test Case Development/Enhancement • Phase-1 • Phase-2 • Phase-3 • ……… • Host Environment Development • Phase-1 • Phase-2 • Phase-3 • ………

  5. 3GPP Releases & Features covered in the Test Suite LTE/EPC Rel. 8 LTE/EPC Rel. 9 LTE/EPC Rel. 10 • 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 • 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 • 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.

  6. Filtering of Test Cases SI Test Cases • Complex Functional Test Cases • Field Test Cases • IOT Test Cases • GCF Test Cases • Pre-SI Phase 1 • Pre-SI Phase 2 • Pre-SI Phase 3 Influenced Test Cases Non-Influenced Test Cases

  7. Test Environment Pre-SI Test Suite in TTCN-3 Network Side Emulator 2G/3G/4G UE System Adaptation Layer / NAS System Adaptation Layer System Adaptation Layer Layer 3 AT/MMI Commands 2G/3G/ L2 Layer 4G LTE (PDCP/RLC/MAC) Layer 2 L1 MAC Adaptation Layer 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.

  8. Sample Scenario#1 LTE [Packet Call] CS-FB call UMTS Add a bearer End CS-FB call back to LTE with both bearers. UMTS MT Voice Call Voice Call End LTE Web Browsing CS-fall back FTP Download

  9. Sample Scenario#2 LTE UMTS UE circulates around cells of different RATs UMTS LTE eNodeB-1 NodeB-1 NodeB-2 eNodeB-2

  10. 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.

  11. Conclusion

  12. Thank You Our Business Knowledge, Your Winning Edge. Amazing Things Happen with Intel Inside®