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88 Chapter 2

S:\agilent\83217\OPT001\BOOK\CHAPTERS\tdscrip.fm

Test Descriptions

TEST_40 - CPD Softer Handoff

NOTE

This test will only run on the Agilent 8924C test set. It will not run on

the Agilent 8924E test set because that unit does not include a Sector B

source.

Description

This test measures the MSUT’s ability to correctly detect Neighbor Set

pilots and Candidate Set pilots.

Settings for mobile-reporting parameters include T_ADD, T_DROP and

T_TDROP. These values are converted to signal strength by the

following equation: P*-0.5 dB, where P is the mobile-reporting

parameter. For example, T_ADD is set to 28, the threshold for

mobile-station detection of a Neighbor Set pilot is 28 *-0.5 dB = -14 dB.

This test is performed as follows:

1. A Service Option 2 (or 9 if parameter 19. RT Rate Set Selection

[0=9600 1=14400] is set to 1) call is attempted, unless a Service

Option 2 or 9 call is already connected. If the MSUT has not

registered, the call attempt may be unsuccessful and the error

message “Failed to establish a call in test <>” will be displayed. To

correct this problem, perform the CPD Registration test.

2. The power levels for Sector A and Sector B pilots, and the mobile

reporting parameters T_ADD and T_DROP, and T_TDROP are set

up. Sector B is set to a power level much less than T_ADD

(Ior/Ioc-10dB) insuring that it is detected as a drop.

3. The Sector B pilot strength is gradually increased until the mobile

station detects signal strength greater than T_ADD. The Sector A

and Sector B signal strength settings (Ec/Io) are displayed, along

with the mobile-reported signal strength and the handoff Sector B

Ec/Io compared to T_ADD.

4. The Sector B pilot strength is increased further until the mobile

station detects that it has exceeded T_COMP. Once again, the Sector

A and Sector B signal strength settings are displayed, along with the

mobile-reported pilot signal strengths and whether T_COMP was

detected correctly.

5. A Softer Handoff is attempted, and an indication whether it was

successful is displayed.

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Carrier 38TXA Guide Betriebsanweisung Seite 88