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E6966A IMS-SIP Network Emulator

Technical Overviews

Accelerate Performance Testing of Cellular User Equipment in an All-IP IMS-SIP Environment

Testing the functionality and performance of cellular user equipment (UE) is essential to achieving a good end-user experience. An IP multi-media subsystem (IMS) allows LTE networks to support voice. Session initiated protocol (SIP) provides the call set-up protocol for IMS-based VoLTE. The move to all-IP networks and new protocols necessitates additional requirements for UE designers and demands testing solutions to address the expanded capabilities of the newest generation of UE.

The Keysight Technologies, Inc. E6966B IMS-SIP client and server applications provide a controlled test environment and easy-to-use interfaces to verify performance of UE running multiple applications such as voice, video, and SMS on an -based network.

Meet increasing UE performance demands

Network operators are motivated to ensure that performance of UE on their network results in a positive end-user experience. While signaling conformance test addresses certain aspects of functionality, operators typically want to conduct more representative performance testing under different network conditions.

Examples include verifying the UE behaves as expected after a base station signal is lost or when moving between different base stations, and in maintaining an active data connection through interRAT handovers such as LTE to 3G.

These real-world use scenarios supplement traditional conformance test and are commonly formalized into operator-specific test plans, requiring UE be subjected to demanding compliance testing before being approved for use on an operator’s network.

Reduce design and compliance test cycles

Keysight offers a number of test solutions based on demands for functional test. Our measurement knowledge and testing experience is built into a range of test tools, so you can focus on verification testing of your UE rather than having to develop in-house test tools. You can run tests manually or automate them for unattended testing; obtaining reliable, repeatable verification with logged results, and allowing you to progress rapidly to deployment.

Voice traffic on IP networks

Having a VoIP and an IMS-based core network is the goal for the majority of the industry, and migration to this solution is currently underway. As a result of this conversion a number of operators are placing new requirements on the network infrastructure and the UE. For networks which do not support IMS, alternative technologies are in use, namely: circuit switched fall back (CSFB)/ single radio approach, and simultaneous voice and data LTE (SV-LTE)/dual radio approach. While these technologies are expedient, they represent an interim step in the migration to VoIP and IMS.

Voice, video, and SMS over IMS

The E6966B is designed specifically to test UE voice, video, and SMS services operating over an IMS core. It provides full client and server implementation, allowing you to perform end-to-end functional test. While IMS-SIP is independent of any specific radio access technology, the E6966B IMS-SIP network emulator is intended for use with the Keysight E7515A UXM and E5515C/E 8960 Series 10 wireless communications test set acting as base station emulators. These test sets provide over-the-air network connection between the UE and the IMS-SIP infrastructure and have the flexibility to emulate a range of different network conditions, enabling UE performance to be verified in a controlled laboratory environment. Already established in the world of 2G, 3G, and 4G performance and conformance test, these leading UXM and 8960 test sets now support IPv4 and IPv6 addressing and the required security configuration to implement functional test. The UXM includes an emulation of the evolved packet core (EPC)—an all-IP mobile core network required by 3GPP in the standards for LTE.

Keysight IMS-SIP server emulator

The IMS-SIP server responds to requests received from the UE and initiates SIP operations including: re-registration, de-registration, and SIP message transmission. Registration may be with or without authentication, PRACK, or preconditions. The server can also be configured for alternative response testing. That is, it can respond in a specific manner that is atypical to a given SMS message received from the UE.

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