Technical data

576 Chapter 20
W-CDMA or W-CDMA (with HSDPA) Over Air
Using the W-CDMA or W-CDMA (with HSDPA) Over the Air Tool
W-CDMA or W-CDMA (with HSDPA)
Over Air
Using the W-CDMA or W-CDMA (with HSDPA) Over
the Air Tool
W-CDMA and W-CDMA (with HSDPA) over the air measurements provide a quick
method of verifying W-CDMA or W-CDMA (with HSDPA) transmitter
performance. These transmitter measurements can be made on a base station
(commonly referred to as a Node B) from the convenience of your vehicle without
taking the base station out of service. Over the air measurements are especially
useful in maintaining hard-to-access cell sites such as pole top base stations. The
W-CDMA Over the Air and W-CDMA (with HSDPA) options (Option
250 - W-CDMA Over Air Test, and Option 245 - HSDPA Analyzer & HSDPA Over
Air Test) may also be used to measure signals at a coupled port on the transmitter.
High Speed Downlink Packet Access (HSDPA) was added in Release 5 of the 3GPP
specifications. HSDPA was added in an attempt to make the W-CDMA systems
more efficient for packet data applications by increasing peak data rates and
reducing packet latency. You will need Option 245 - HSDPA Analyzer & HSDPA
Over Air Test to make HSDPA-specific measurements, although other W-CDMA
measurements can still be made without this option installed on your test set.
This chapter covers Option 250 - W-CDMA Over Air Test installed on its own, and
Option 250 - W-CDMA Over Air Test installed together with Option 245 - HSDPA
Analyzer & HSDPA Over Air Test.
Where differences exist between using Option 250 - W-CDMA Over Air Test
installed on its own, and using it in conjunction with Option 245 - HSDPA Analyzer
& HSDPA Over Air Test, these differences are usually called out in this document.
Where the differences are small, however, they are not called out.
Example of a difference that is not called out: a title on a menu can be either
W-CDMA Ovr Air or HSDPA Over Air depending on whether or not Option
245 - HSDPA Over Air Test & HSDPA Over Air Test has been installed. The keys
under that menu do not change, and only the title of the menu changes. Such
differences are not called out here.
For out-of-service W-CDMA (without HSDPA) transmitter measurements, the
W-CDMA Tx Analyzer option (Option 240 - W-CDMA Analyzer) is recommended.
For all HSDPA measurements, including out-of-service HSDPA transmitter
measurements, the HSDPA option (Option 245 - HSDPA Analyzer & HSDPA Over
Air Test) is recommended. For more information refer to “W-CDMA or W-CDMA
(with HSDPA) Analyzer” on page 535.