Table of Contents
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Contents
Section 1-Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Test Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Base Station (Test Set) Power Transitions . . . . . . . . . . . . . . . . 2
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Section 2-Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 3-Connecting the Equipment . . . . . . . . . . . . . . . . . . . . . 4
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Section 4-Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 5-Configuring the Test Set . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the RF Level Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the Pilot and Traffic Channels . . . . . . . . . . . . . . . . . . . . 8
Setting the Channel and Protocol . . . . . . . . . . . . . . . . . . . . . . . 10
Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
and Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setting "CDMA Config" Options . . . . . . . . . . . . . . . . . . . . . . . 14
Setting the RF Channel Function . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Time Response Function . . . . . . . . . . . . . . . . . . . . 15
Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Open Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Closed Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Appendix 2-The Effect of Closed Loop Control
on the Open Loop Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Appendix 3-Determining Cable Connection Losses . . . . . . . . 18
External Power Meter Method . . . . . . . . . . . . . . . . . . . . . . . . . 18
Using the Agilent 8924C Test Set . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix 4-Trigger Signal Description . . . . . . . . . . . . . . . . . . . 19
Making a Trigger Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Trigger Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Agilent 8924C
CDMA Mobile Station Test Set
Product Note
Open Loop Power-Control Time-Response Test
This product note will help you measure the "time
response of open loop power control" for a CDMA
mobile cellular telephone. The equipment and pro-
cedures in this document apply to CDMA mobile
cellular telephones based on TIA/EIA/IS-95-A, or
related industry standards.
Section 1-Introduction
The open loop power control time-response is
defined as the amount of time (t) it takes the
mobile phone to respond to and acquire equilib-
rium following a step increase in base station
power, ∆P
.
in
This test verifies that the mobile is capable of
adjusting its transmit power throughout its dynamic
range of transmission within a power versus time
mask determined by applicable standards.
An example of this mask, with a ∆P
∆t = 100 ms, is shown in Figure 1. For TIA/EIA/IS-
95-A, the upper and lower limits of this mask are
determined by the equations shown on the follow-
ing page.
= 20 dB and
in
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Related Manuals for Agilent Technologies 8924C
Summary of Contents for Agilent Technologies 8924C
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Page 1: Table Of Contents
External Power Meter Method ......18 Using the Agilent 8924C Test Set ..... . . 18 Appendix 4—Trigger Signal Description . -
Page 2: Test Parameters
Upper Limit Equations Base Station (Test Set) Power Transitions For: 0 <t <24 ms: Max [1.2 x | ∆P | x (t/24), | ∆P 1. The open loop power control time-response test x (t/24)+2.0 dB] +1.5 dB is initiated at a power level of –60 dBm (base station). -
Page 3: Section 2-Test Equipment
The Test Set must be equipped with electronic attenuators. NOTE: To determine if the Agilent 8924C Test Set is equipped with an electronic attenuator, access the Test Set’s TESTS screen (this procedure will erase any other IBASIC program stored in the test set): 1. -
Page 4: Section 3-Connecting The Equipment
E8285-90018 1. Connect the CDMA phone to the power splitter. Ensure that the CDMA phone is properly • Agilent Technologies 859XE Users Guide, pub. shielded against external RF interference. An number 08590-90301 example of interference is an active base sta- tion transmitting on the same channel as the •... - Page 5 Figure 4. Setup for PCS Band Phones...
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Page 6: Section 4-Test Procedure
Section 4—Test Procedure 5. Measure the delay between the test set’s trigger signal and power transmission step using the This section is a step-by-step measurement proce- spectrum analyzer as described in Section 7— dure. Some of the following steps will refer you to Determining the Test Set’s Trigger Time Delay. - Page 7 6. Configure the spectrum analyzer and software 11. On the spectrum analyzer, on the Time as described in Section 8—Configuring the Response screen (see Figure 6), select the OPEN Spectrum Analyzer and Software. Enter the LOOP softkey. This will start the open loop time- recorded delay time into the DELAY field of the response test.
- Page 8 14. A 20 dB step change of the test set’s power will trigger the time response test. Figure 8 shows the results of a 20 dB decrease in the test set’s transmitted power. Note that PASS or FAIL is displayed in the lower right corner. 15 Step decrease Sctr A Pwr field to –60 dBm.
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Page 9: Section 5-Configuring The Test Set
Section 5—Configuring the Test Set Setting the Pilot and Traffic Channels Access the CDMA GENERATOR CONTROL screen, As an example, the following test set screens show see Figure 10. the appropriate settings for testing a U.S. PCS phone. The screens presented are accurate with 1. -
Page 10: Setting The Channel And Protocol
Setting the Channel and Protocol 3. Enter the appropriate protocol for the selected channel standard into the Protocol field (item 2). Access the CDMA CALL CONTROL screen, see Figure 11. For example: 3a. For U.S. CDMA PCS frequencies, select 1. Set the RF Chan Std field (item 3) to the appro- priate standard. -
Page 11: Setting The Cdma Transmitter Power
PCS interface, or the RF IN/OUT and DUPLEX OUT ports on the test set, must be connected together with a short RF cable. Refer to the Agilent 8924C Applications Guide, chap- ter 1, pub. number 08924-90021, for assistance in calibration. -
Page 12: Section 6-Setting Up A 20 Db Increment On The Test Set
Section 6—Setting Up a 20 dB Increment on the Section 7—Determining the Test Set’s Trigger Test Set Time Delay You can increase or decrease the Sctr A Pwr by 20 dB In order to perform an accurate open loop power with a press of one button. - Page 13 5e. Enter 0 Hz, and press the ENTER key. 10. Change the test set’s Sctr A Pwr field from –40 to –60 dBm. It typically falls within 15 to 20 ms. 5f. Press the BW Band Width key. Each major graticule line from left to right is 2 milliseconds (typically set trigger delay is 5g.
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Page 14: Section 8-Configuring The Spectrum Analyzer
Section 8—Configuring the Spectrum Analyzer For example: 3a. 6 dB of attenuation is measured (see and Software Appendix 3—Determining Cable First install the Agilent 89725C software follow- Connection Losses). ing the instructions in the 85725C user’s guide, Chapter 1—Getting Started, step 1 “Load the 3b. -
Page 15: Setting The Rf Channel Function
Setting the RF Channel Function Setting the Time Response Function 1. Select the RF Channel softkey on the CDMA 1. Press the More 1 of 3 softkey on the CDMA ANA- ANALYZER main menu 1 of 3, the RF Channel LYZER main menu to go to menu 2 of 3 (see options will appear (see Figure 15). - Page 16 3d. Press the Previous Menu softkey to return to the Time Response menu screen. References • Agilent Technologies 89725C Measurements Personality User’s Guide, pub. number 85725- 90010 • For Agilent Technologies 859XE setup and con- figuration refer to the User’s Guide, pub. num- ber 08590-90301.
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Page 17: Appendix 1-Background On Open And Closed Loop
Appendix 1—Background on Open and Closed Closed Loop Closed loop power control accompanies the open Loop Power Control loop power control process. The base station moni- The effectiveness of CDMA as a method to increase tors the received signal from the mobile and deter- call capacity is partially determined by how effec- mines if the signal is “just good enough to maintain tive the transmitted power of each mobile can be... - Page 18 Appendix 2—The Effect of Closed Loop Control This can cause a problem when the base station is transmitting near the noise floor. Since there is no on the Open Loop Test form of error correction associated with the “punc- Since this test is only concerned with the open tured”...
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Page 19: Appendix 3-Determining Cable Connection Losses
RF level offset. meter can be used. Listed below are the steps you need to take to find your RF power compensation: Using the Agilent 8924C Test Set To determine the attenuation of the power splitter 1. Zero the power meter. - Page 20 Appendix 4—Holding the PCS Interface’s RF To correct this problem, the mechanical attenuator in the PCS interface is set in a fixed state, and the Attenuator RF output level is varied using the transit-free elec- This appendix applies only if an Agilent 83236B tronic attenuator in the test set.
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Page 21: Appendix 4-Trigger Signal Description
600 nanoseconds (ns). Reference For more information on the auxiliary control port refer to: Agilent 8924C Reference Guide, pub. num- ber 08924-90053. Figure 17. Trigger Delay Response 1. To measure the precise delay time for your test set, refer to Section 7—... - Page 22 By internet, phone, or fax, get assistance with all your Support, Services, and Assistance test and measurement needs. Agilent Technologies aims to maximize the value you receive, Online Assistance while minimizing your risk and problems. We strive to ensure www.agilent.com/find/assist that you get the test and measurement capabilities you paid for and obtain the support you need.