This chapter will:
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Describe what the MOB-IP-SIM™ can do
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Describe how the MOB-IP-SIM™ does its job
By simulating the Foreign Agent and Home Agent required for a Mobile IP connection, the Mobile IP Simulator ( MOB-IP-SIM™ ) provides the tools needed for complete developmental testing of wireless devices using Mobile IP as the high-speed data interconnectivity protocol. The wireless device can access web content supplied by the MOB-IP-SIM™ for testing specific features or can access the Internet by means of the simulator. Two models are available: The MIP-5800 provides the minimum set of configuration parameters needed to support Mobile IP connectivity under standard network conditions, while the MIP-5850 provides additional configuration parameters to allow network error simulation and system configuration control. The MIP-5850 is designed for Mobile IP protocol development and supports test features required to verify compliance with the IS-835 standard. Refer to Figure 1.1, “MOB-IP-SIM Conceptual Overview” for an conceptual overview of the system.
The previous figure shows the complete Mobile IP network test system. The Agilent E5515C communications test set provides the required cdma2000 radio network emulation and control, containing the radio link, call setup, and Inter-Working Function (IWF) needed for packet data communications. The MOB-IP-SIM™ provides the additional IP network elements needed to complete the Mobile IP network simulation environment, namely the simulated PDSN, Foreign Agent (FA), and Home Agent (HA) necessary to set up wireless IP connections.
The combination of the E5515C and the MOB-IP-SIM™ therefore provides a complete solution for Mobile IP connectivity and testing, allowing you to choose levels of features that range from basic connectivity to semi-automated conformance testing.
The simulator is contained in a small enclosure with serial port and LAN connectors. PPP data running over the LAN interfaces the Mobile IP simulator to a cdma2000 communication test set and supports Mobile IP for a single device. The LAN connection provides a web-based user interface to configure the simulator as well as a text-based serial command port. Configuration requires setting the MOB-IP-SIM™ to match your specific LAN connection, setting the PPP links for Simple IP and Mobile IP provisioning and operation, and setting up the NAT router. The user interface also provides access to system and data logs and online documentation.
The relationship of the various components required to set up an end-to-end data call are indicated in Figure 1.2, “MOB-IP-SIM Component Diagram”.
The simulator must be configured to work within the bounds of your local area network. This configuration, covered in Chapter 3, Simulator Configuration , sets up access to the external Internet and provides routing connections to other entities that you may plan to use as part of your wireless IP test environment. Setup is accessed through any standard Internet browser connected to the LAN where the simulator is installed. The MIP-Manager, a simulator setup utility, is included on the accompanying CD to assist with the initial installation.
The MIP-5800 simulator provides web-based user access to the basic parameters needed to provision the mobile device for Simple IP and Mobile IP operation.
The MIP-5850 simulator provides dynamic control of many additional test parameters that can be modified prior to a data connection attempt or during the data connection in some cases. The most common setup parameters can be set using the web-based interface, while more complex controls must be changed using "AT" commands sent from a terminal or conformance test script.
The following table indicates the features supported by the two models of the Mobile IP Simulator.
| Feature | MIP-5800 | MIP-5850 |
|---|---|---|
| Built-in NAT Routing | Yes | Yes |
| Built-in HTTP Proxy Server | Yes | Yes |
| Built-in Web Server | Yes | Yes |
| Built-in FTP Server | Yes | Yes |
| Status & Activity Logging | Yes | Yes |
| PPP Logging: (Includes PPP, IP, UDP, Mobile IP layers) | Yes | Yes |
| Registration Request: Automatic MD5 or HMAC-MD5 with or without SPI authentication | Yes | Yes |
| Primary HA Simulation | Yes | Yes |
| Secondary HA Simulation | No | Yes |
| Agent Advertisement: Configurable delay, # of repeats and delay between repeats | No | Yes |
| Agent Advertisement: Configurable Lifetime, Pref. Reg. Lifetime, care-of address, & bit options | No | Yes |
| Registration Response: Configurable Lifetime & Code | No | Yes |
| "AT" command set to support hand-off control, remote test configuration, and log search | No | Yes |
| PPP: Configurable CHAP or PAP authentication for Simple IP | No | Yes |
| PPP: Configurable CHAP or PAP authentication for Simple IP | No | Yes |
Table 1.1. Features Matrix