Circuit Switched Data Service

Circuit Switched Data Service

Last updated: January 16, 2009

The test set supports two types of circuit switched (CS) data service:

The synchronous/transparent service is used by 3G-324M multi-media applications (for example, video phones), whereas the asynchronous/non-transparent service is used by more bursty data, such as IP traffic. The primary difference between the two services is that they use different radio bearer configurations, and the asynchronous/non-transparent configuration includes the RLP layer above the RLC entities (the RLC entities connect directly to the application in the synchronous/transparent configuration).

Asynchronous/Non-Transparent CS Data Service

The test set only supports UE-originated asynchronous/non-transparent CS data service, but both test set and UE-initiated release from the CS data service are supported.

Two radio bearers are supported: 57.6k UL/57.6k DL CS Data RAB (see 3GPP TS 34.108, 6.10.2.4.1.17) and 14.4k UL/14.4k DL CS Data RAB (see 3GPP TS 34.108, 6.10.2.4.1.15). You may specify the downlink DPCH channel codes for these two RABs using the DPCH 120 ksps Channelization Code and DPCH 30 ksps Channelization Code settings (see Downlink Channel Codes and Levels ).

Async CS Data Source

You may choose what application protocol uses the CS data service using the Async CS Data Source setting. This setting can only be changed when the call status is idle. This setting allows you to specify the access point to the traffic plane data stream as follows:

GPIB command: CALL:SERVice:CSData:MODE:ASYNchronous:OUTput .

CS Data Asynchronous Bearer User Plane Protocol Configuration

Synchronous/Transparent CS Data Service

The synchronous/transparent CS data service allows you to make two types of 3G-324M video calls: UE-to-UE Video Call (lab application or feature-licensed test application) and UE-to-8960LAN Video Call (lab application only).

At this time, a video call connection is the only type of synchronous/transparent CS data service supported in the test set.

One radio bearer is supported: 64k UL/DL CS Data RAB (see 3GPP TS 34.108, 6.10.2.4.1.13). You may specify the downlink DPCH channel code for this RAB using the DPCH 120 ksps Channelization Code setting (see Downlink Channel Codes and Levels ).

Related Topics

Manual Operation: How Do I Configure the Data Channel?

Circuit Switched Data Service Ladder Diagrams

Video Call

Downlink Channel Codes and Levels

CALL:SERVice

DUT IP Setup

Rear Panel Connectors