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Chapter 15 385
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
different trigger choice without having to return to any one particular menu. Pressing the
PRACH Trigger softkey is a manual trigger action. You can also provide an external trigger
signal for the PRACH transmission.
3. Press the PRACH Trigger Source Immedi Trigger softkey until Immedi is highlighted.
The Immedi choice lets the W-CDMA signal transmission start as soon as the modulation
format is turned on. Since the format is already on, selecting Immedi will enable the
immediate transmission of the currently configured signal.
Configuring the Message Part Transmission
1. Choose whether or not to transmit the message part
a. Highlight the Message Part field.
b. Press the
Edit Item softkey.
Two softkeys are displayed,
ON and OFF. When you select OFF, the message part is not
transmitted leaving only the preamble as the PRACH transmission.
c. Press the ON softkey since we will be transmitting the PRACH with both the preamble
and message part.
2. Select the transmission time for the message part.
a. Highlight the TTI (transmit time interval) field.
b. Press
10 > msec.
There are two valid entries for this field, 10 or 20 ms. The values can be entered using
decimal notation (0.01 or 0.02 seconds) or millisecond units (10 or 20 ms).
The 10 ms setting equates to 7.5 access slots (one radio frame) and the 20 ms spans 15
access slots (two radio frames).
If you need to have an individual PRACH (UE) repeat multiple times within the 80 ms
time period, you may want to use the 10 ms setting. Since you are limited to 60 access slots
(80 ms), the 20 ms setting will decrease the number of times a UE’s PRACH can be
retransmitted within the 80 ms time period.
3. Enter the number of access slots from the preamble to the message part (Tp-m).
The number of access slots starts from the beginning of the preamble and ends at the
beginning of the message part. Figure 15-28 shows a PRACH with a Tp-m of 3 access slots.
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