Application Note #69
Spirent Communications Copyright 2002
Version 1.0 - 01/12/02 - Page 1
Application Note 69: 3GPP TR 25.943 Deployment
Channel Models for UMTS W-CDMA
Document 3GPP TR25.943 consists of generic fading models for testing devices
operating in the cellular radio channel environment. 3GPP TR 25.943 is based on both
the COST
1
259 radio propagation studies and on the GSM test specifications derived
from COST 207. Recent enhancements have been made to 3GPP TR25.943 describing
how to tailor the generic channel models for specific applications, in this case UMTS W-
CDMA
2
. This document describes the 3GPP TR 25.943 UMTS W-CDMA channel
models and illustrates how they are implemented using a TAS4500 FLEX5 RF Channel
Emulator. An example derivation of the UMTS W-CDMA channel model translations is
also included in the Appendix.
UMTS W-CDMA test specifications such as 3GPP TS 25.141, TS 34.121, TS 25.142,
and TS 34.122 isolate particular receiver functions to facilitate conformance testing of
both UE’s and Node B’s. These conformance test specifications contain static and
dynamic radio propagation channel models used to evaluate an UMTS W-CDMA
receiver. Static channel models define up to six path Wide Sense Stationary Uncorrelated
Scattering (WSSUS) models. Dynamic channel models consist of non-stationary (delay
profiles varying with time) Moving Propagation and Birth-Death conditions and are
intended to evaluate the ability of a UMTS W-CDMA RAKE receiver to track dynamic
channel conditions.
3GPP TR 25.943 shifts the focus from product conformance testing to product
deployment testing. For example, a Node-B or UE manufacturer/designer is now able to
use 3GPP TR 25.943 to evaluate the performance of their design under deployment-like
conditions. The deployment models defined by 3GPP TR 25.943 include conditions that
emulate Rural, Urban, and Hilly Terrain environments.
The TAS4500 FLEX5 from Spirent Communications exceeds the 3GPP radio channel
modeling requirements defined by 3GPP TS 25.141, TS 34.121, TS 25.142, and TS
34.122 and the requirements specified in 3GPP TR 25.943. The end-user can easily recall
pre-defined standard files that map 3GPP channel models to FLEX5 instrument settings.
The end user can also modify and save standard files to create an unlimited combination
of user-defined scenarios.
3GPP TR 25.943 Channel Models for UMTS W-CDMA
1
COST (COperation européenne dans le domaine de la recherche Scientifique et Technique)
is a European
Union Forum for cooperative scientific research. For example, the COST 259 project on Wireless Flexible
Personalized Communications ran from 1996 to 2000 and dealt with different aspect of mobile radio communications.
2
Enhancements to 3GPP TR 25.943 were approved by the 3GPP RAN (Radio Access Network) working group in
December 2001 and are incorporated into version 4.1 of the document.
