Real Time

Configuring User Data

The flexibility of defining your own data pattern lets you control whether to use five 2 ms TTIs (subframes) or a 10 ms TTI (full frame). If you configure data for subframes, you must include enough data for five subframes (one full frame).

This topic demonstrates how to create user-data using an E-DPDCH. Even though this topic uses an E-DPDCH, the procedure for creating the data applies to all channels that have the user data feature.

Add the Channel

Perform this procedure only if you do not have an uplink carrier that contains an E-DPDCH.

1. In the tree view, click Waveform Setup.

2. Click the add new carrier button.

   

3. From the drop-down menu, select Basic W-CDMA/HSPA+ UL Rel 8

   

4. In the summary table, double click the W-CDMA FDD Uplink carrier.

   

   Notice that in the tree view, the highlight moves from Waveform Setup to Carrier n. The uplink carrier parameters appear in the property pane below the summary table. Alternatively click on Carrier n (where n denotes the uplink carrier) in the tree view.

5. In the summary table, again double click the Basic W-CDMA/HSPA+ UL Rel 8 carrier.

   The summary table changes from a carrier summary to a channel summary, which displays a single DPCCH. In the tree view, the highlight changes from Carrier n to Channel Setup. Alternatively expand Carrier n in the tree view, and click Channel Setup.

   

6. Click the add new channel button.

   

7. From the drop-down menu, select E-DPDCH I.

   

Create the Data

In this procedure, we create the user data with the following requirements:

• spread factor 4

• 960 kbps channel rate

• 9600 bits per frame

While this procedure states the data requirements it uses, it also includes the steps to find the data values when you may have only one or two of the requirements.

The software inserts the data at the physical channel level, bypassing the transport layer coding. You have the option of inserting a known data string, or manually encoding the data to simulate transport layer coding, and then inserting the data. In this procedure, we insert a known data string (uncoded).

1. Determine the Number of Bits for a Frame

   1. Find the spread factor that conforms to 960 kbps.

      The 3GPP standard TS 25.211 contains the slot formats for the various channel types.

   2. Note the number of bits per frame.

      You can also use the subframe value and multiply the value by 10 to determine the number of bits in a frame.

2. Open the Data Dialog Box

   1. Click E-DPDCH in the summary table.

      

      The property pane displays the E-DPDCH channel parameters.

   2. Click Data.

   3. Click the detail icon that appears at the far right of the cell.

   4. Select User Defined Bits from the dialog box that appears.

3. Enter the Data

   The software provides you the option of creating the data external to the software and importing the data file, or creating the data internal to the software.

   1. Insert 9600 bits.

   2. Click OK.

Configure the Channel for the Data

In this procedure, we configure the channel parameters to conform to the E-DPDCH FRC4 data rate.

1. Click Rate.

2. From the drop-down menu, select 960 ksps.

   This is the data rate required to match 9600 bits per frame.

3. Click Spreading Code.

4. Enter a value between 0 and 3.

   For the E-DPDCH with a data rate of 960 ksps, the spread factor is 4, which dictates a spreading code range of 0 to 3.

   Ensure that the value entered does not create a code domain conflict with the other physical channels.

Related Topics

Frame Structures

Data Selection Dialog Box