1、 /I STD-CEPT ERC REPORT b4-ENGL 2999 M 232b4L4 0015842 399 ERC REPORT 61 European Radiocommunications Committee (ERC) within the European Conference of Postal and Telecommunications Administrations (CEPT) FREQUENCY SHARING BETWEEN UMTS AND EXISTING FIXED SERVICES Menton, May 1999 STD-CEPT ERC REPORT
2、 bY-ENGL 1999 W 232b414 0015842 225 Copyright 1999 the European Conference of Postal and Tclexommunications Adminisustiom (EPT) ERC REPORT 64 FREQUENCY SHARING BETWEEN UMTS AND EXISTING FEED SERVICES 2 FIXED LINK DEPLOYMENT AND PARAMETERS . . 1 3 UMTS SHARING PARAMETERS . . 1 4 MODEL FOR STUDY OF FR
3、EQUENCY SHARING 1 4.1 PROPAGATION MODEL 1 4.2 INTERFERENCE CALCULATION MODEL 1 CO-CHANNEL FREQUENCY SHARING ANALYSES., . “ 2 5 5.1 SHARING COMBINATIONS . 2 5.2 EWPLE RESULTS . 2 DISCUSSION AND CONCLUSION . 4 6 7 REFERENCE 4 ANNEX A : Existing Services in the Frequency Bands designated for UMTS in ac
4、cordance with the ERC Decision (97)M (January 1998) 7 1 STD-CEPT ERC REPORT 64-ENGL 1999 232b4L4 0015844 OTB ERC REPORT 64 Page 1 FREQUENCY SHARING BETWEEN UMTS AND EXISTING FIXED SERVICES 1 INTRODUCTION This report addresses co-frequency sharing and compatibility issues surrounding the implementati
5、on of UMTS, given the operation of existing fixed service systems in some European countries in the bands identified in ERC Decision DEC (97) 07 on WS. The report examines the geographical separation distances that may be required between UMTS stations and fixed services. 2 FIXED LINK DEPLOYMENT AND
6、 PARAMETERS The ER0 Study on UMTS 11 contains details of the current fixed link deployment within the UMTS bands in Europe. Most countries have some fixed links in operation at present in the bands identified for UMTS, many having several hundred transmitters. Fixed links in the UMTS bands are deplo
7、yed mainly in accordance with ITU-R Rec. F.382 and F.283 channel plans. The sharing parameters of typical 2GHz fixed links can be found in ITU-R Recommendation F.759. The key fixed link parameters required for the co-frequency sharing studies are listed in Table 1. Results of the ER0 Survey on exist
8、ing use of the 2 GHz band are shown in Annex A. 3 UMTS SHARING PARAMETERS The key UMTS radio system parameters required for the frequency sharing studies are shown in Table 2 below. At the current time (July 1998) the UMTS radio parameters are not yet fully defined within ETSI. However, in liaison w
9、ith ETSI SMG2 (see Doc ERC TG1 (97) 66), some example values have been derived for the key parameters which are relevant to co-channel frequency sharing and it is therefore possible to undertake some preliminary example calculations. 4 MODEL FOR STUDY OF FREQUENCY SHARING 4.1 Propagation model The s
10、tandard model agreed in the ITU and CEPT for terrestrial interference assessment at microwave frequencies is ITU-R Recommendation P.452-8. It is therefore proposed that this model is used in the assessment of interference potential between UMTS and fixed links using MCL methods. For Monte Carlo simu
11、lations the “WG-SE (Hata based) model developed in CEPT is recommended. 4.2 Interference calculation model There are two basic approaches to calculating the interference potential between systems that have been used in previous CEPT ERC WG-SE work, namely minimum coupling loss (MCL) and the Monte Ca
12、rlo statistical method. The former model is simpler to implement, but is conservative and can give more pessimistic results than are obtained in reality in cases where some of the input parameters in practice have a probability associated with STD*CEPT ERC REPORT b4-ENGL 1999 M 232b414 0015845 T34 =
13、 ERC REPORT 64 Page 2 them. CEPT ERC WG-SE is in the process of developing a software implementation of the Monte Carlo model (via a MOU between interested parties), however this may not be available until Summer 1999. For the purposes of this ERC Report the MCL method is adopted in order to carry o
14、ut a first assessment in short timescales. It is considered that the MCL method is sufficient for examining Co-frequency sharing between fixed links and base stations (a relatively static situation), whereas this approach is slightly pessimistic in the case of fixed links vs mobiles. However, it is
15、not envisaged that a Monte Carlo analysis would give very different results from the MCL approach in the specific Co-channel sharing situation covered by this Report. 5 CO-CHANNEL FREQUENCY SHARING ANALYSES 5.1 Sharing combinations There are four interference modes that need to be considered : UMTS
16、Mobile transmitter -i Fixed Link Receiver UMTS Base transmitter + Fixed Link Receiver Fixed link transmitter +J UMTS Mobile Receiver Fixed link transmitter + UMTS Base Station Receiver The various fixed link equipment types and UMTS environments need to be considered in order to get a view of the sc
17、ale of the typical Co-channel frequency sharing problem between UMTS and co-channel fixed links. Although these studies apply to co-channel interference problems, the same method could be applied to adjacent band compatibility issues. In this case the receiver blocking performance and the transmitte
18、r out of band emissions need to be taken into account. 5.2 Example results Example 1 : UMTS Base station transmitter + Fixed Link Receiver Figure 1 shows the results of long-term (20% time) interference calculations around an example 2 GHz fixed link in the United Kingdom from a single multichannel
19、UMTS wide-area coverage base station. Similar calculations done for propagation conditions at shorter time percentages (e.g. 0.01%) and the example fixed link sharing criterion for that time percentage are shown in Figure 2. STD-CEPT ERC REPORT 64-ENGL L979 232b414 0015846 970 W UMTS BS receiver (W-
20、CDMA) Carrier Frequency 1.95 GHz Location Trial located ERC REPORT 64 Page 3 Fixed link transmitter (960 cct FM FDM) Antenna gain and radiation pattern Feeder and multiplexer losses 35 Bi (measured WE) 3 dB The sharing parameters used in this example study are listed below. Ground height Antenna hei
21、ght Antenna pointing The shaded areas on the plot represent locations where, if a UMTS base station is located, the interference level at the fixed service receiver is predicted to exceed the sharing criterion. Additional contours are included to illustrate the improvement in the sharing situation i
22、f additional losses were available (e.g. Frequency Offset Rejection for adjacent channel sharing, additional losses due to clutter and site shielding etc.). every 0.25 sq km (Database) Antenna height a.g.1. 48m 20m agl Ground height (Database) Towards FS Transmitter power O dBW In this particular ex
23、ample it can be seen that the potential interference zones extend to many 10s of km, particularly along the fixed link receiver antenna boresight. 3dB channel bandwidth interference power density Antenna gain Maximum permissible Example 2 : Fixed link transmitter + UMTS base station receiver (in UMT
24、S receiver bandwidth) 4.1 MHz (20% of time) 14.5 dBi -133 dBW Figure 3 shows the results of long-term (20% time) interference calculations around an example 2 GHz fixed link transmitter in the United Kingdom into a UMTS wide-area coverage base station receiver. The short term interference requiremen
25、ts of the UMTS receivers are unspecified (as is normally the case with such mobile systems) and so this has not been evaluated. The sharing parameters used in this example study are listed below. The shaded areas on the plot represent locations where, if a UMTS base station receiver is located, the
26、interference level from the fixed service transmitter is predicted to exceed the sharing criterion. Additional contours are included to illustrate the improvement in the sharing situation if additional losses were available (e.g. Frequency Offset Rejection for adjacent channel sharing, additional lo
27、sses due to clutter and site shielding etc.). STD-CEPT ERC REPORT b11-ENGL 1999 m 232b414 OOL5847 807 W Antenna height a.g.1. Tx output power Polarization Transmitter mask ERC REPORT 64 Page 4 Maximum permissible interference power density (long and short-term time %) Frequency offset attenuation 6
28、DISCUSSION AND CONCLUSION Power into antenna Antenna gain Channeling and frequency re-use plan The sharing situation between UMTS and existing fixed services will depend on the exact operational parameters of the UMTS and fixed service systems as well as factors such as the terrain features at the p
29、articular geographical location under consideration. The UMTS sharing parameters are not yet fully defined, particularly those parameters needed to assess adjacent band compatibility. Noise figure Sensitivity Intrasystem C/Ic It is therefore not possible to give definitive results on the separatiodc
30、oordination distances required between these systems. However, the methods described above and the results of example studies can provide guidance to administrations planning deployment or coordination of UMTS with existing fixed services. 7 REFERENCE 1. ER0 report on UMTS European Radio Office, Cop
31、enhagen, September 1996 Table 1: Fixed link sharing parameters Centre Freauencv I Antenna eain and radiation Dattern I Transmitter Receiver I Modulation & Capacity 3dB Bandwidth I Feeder and multiplexer losses I Antenna height ad. Antenna gain and radiation pattern Feeder and multiplexer losses I 3d
32、B IF bandwidth I Nominal Rx input level Table 2: MTS Parameters for frequency sharing ERC REPORT 64 Page 5 Figure 2 : Example Sharing Study (UMTS BS Tx into FS Rx) Short term interference STD-CEPT ERC REPORT bi-ENGL 1999 232b4Lli 00358q9 bBT ERC REPORT 64 Page 6 STD.CEPT ERC REPORT b4-ENGL 1999 232b4L4 0035850 3TL I o LE I
