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# Speed Simulation for mobile Vuser scripts

Speed Simulation models the behavior of a mobile network. This enables you to test applications, while taking into consideration end-to-end response time from device to server.

Three configuration options are available, allowing you to maximize the accuracy of your simulation:

- Maximum Bandwidth
- Standard Bandwidth
- Custom Bandwidth

You set the bandwidth using the Speed Simulation Runtime settings as described below.

To access: VuGen > Runtime settings > Network > Speed Simulation

User interface elements are described below:

UI Element | Description
--- | ---
Use maximum bandwidth | Vusers run at the maximum bandwidth that is available over the network. This option is provided in cases where you do not want to emulate a specific network. This is the default setting.
Use standard bandwidth | General Packet Radio Service (GPRS) Enhanced Data rates for GSM Evolution (EDGE) Universal Mobile Telecommunications System (UMTS) High-Speed Downlink Packet Access (HSDPA) High-Speed Downlink Packet Access Phase 2 (HSDPA phase 2) High-Speed Uplink Packet Access (HSUPA) Each network type has both a maximum and expected rate. The maximum rate represents the technology's best case performance rate while the expected rate more accurately reflects real time performance.
Use custom bandwidth | Sets a custom download and upload speed, defined in bits. You can set a single value or range for either the upload or download speed. A case where this option would be useful, is when you know the expected network speed from your cellular provider for a specific area. Download speed:The download speed in bits, defined as a range or single value. Upload speed:The upload speed in bits, defined as a range or single value. Note: If you select this option and either the upload speed or download speed fields are left blank, the empty value is automatically set to the value of the non-empty field. If you select this option and leave the upload speed and download speed fields blank, the default setting of maximum bandwidth is used.

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