Chapter 16 491
W-CDMA Uplink Digital Modulation for Receiver Test
Setting Up a Multiple PRACH Signal
Activating the UES
This task assumes the factory preset conditions for the timing setup table. The desired UEs can be turned off
or on at any time during your signal setup.
1. Turn on UE2 and UE4.
a. Highlight Off for UE2 in the On/Off column.
b. Press the
Edit Item softkey.
Each press of the
Edit Item softkey turns the UE on or off.
c. Repeat steps a and b for UE4.
Setting the Preamble Signature
The signature is used by the base station to identify which UE it is communicating with. This task assumes
the factory preset conditions for the timing setup table.
1. Set the UE1 preamble signature to five.
a. Highlight the Signature field that corresponds to UE1.
b. Press
5 > Enter.
The range for this field is 0 to 16.
2. Set the UE2 preamble signature to seven.
a. Highlight the Signature field that corresponds to UE2.
b. Press
7 > Enter.
3. Set the UE4 preamble signature to zero.
a. Highlight the Signature field that corresponds to UE4.
b. Press
0 > Enter.
Configuring Access Slots
When transmitting multiple PRACHs for the same UE, they cannot occupy any of the same access slots
within the 80 ms period. If they do, the subsequent (second PRACH, etc.) PRACH transmission that uses
any of the same access slots will not be occur.
There are two ways to enter the access slot number within the timing setup table:
• Enter the access slot number using the numeric keypad and press the
Enter softkey.
•Press the
Edit Item softkey, enter the number using the numeric keypad, and press Enter.
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