ECC REPORT 96
COMPATIBILITY BETWEEN UMTS 900/1800 AND SYSTEMS
OPERATING IN ADJACENT BANDS
Krakow, March 2007
Electronic Communications Committee (ECC)
within the European Conference of Postal and Telecommunications Administrations (CEPT)
ECC REPORT 96
1 EXECUTIVE SUMMARY
This report deals with the compatibility study between UMTS900/1800 and systems operating in adjacent bands.
This report gives the description of the compatibility study methodology, co-existence scenarios, simulation assumptions,
and the results for the deployment of UMTS operating in 900 MHz and in 1800 MHz bands taking into account adjacent
band systems. Although best effort has been made to provide assumptions and results to encompass the widest range of
possible situations, however there might be some country specific cases where different assumptions need to be made.
Furthermore it has to be noted that based on the operational experience further analyses may have to be carried out.
Based on the interference analysis, the following conclusions can be made:
• UMTS900 can be deployed in the same geographical area in co-existence with GSM-R as follows:
1) There is a priori no need of an additional guard band between UMTS900 and GSM-R, a carrier separation of 2.8
MHz or more between the UMTS900 carrier and the nearest GSM-R carrier is sufficient without prejudice to
provisions in point 2). This conclusion is based on Monte Carlo simulations assumed suitable for typical case.
2) However for some critical cases (e.g. with high located antenna, open and sparsely populated areas served by high
power UMTS BS close to the railway tracks, blocking etc, which would lead to assumption of possible direct line
of sight coupling) the MCL calculations demonstrate that coordination is needed for a certain range of distances
(up to 4 km or more from railway track).
3) It is beneficial to activate GSM-R uplink power control, especially for the train mounted MS, otherwise the impact
on UMTS UL capacity could