1、STDmCEPT EKC REPORT 75-ENGL 1997 e 232LLiL9 Oi31b374 1118 = ERC REPORT 75 European Radiocommunications Committee (ERC) within the European Conference of Postal and Telecommunications Administrations (CEPT) -_ _ NARROWBAND RETURN PATH TWO WAY PAGING COMPATIBILITY STUDIES IN THE 406.1 - 410 MHz, 440 -
2、 470 MHz AND 862 - 871 MHz BANDS Menton, May 1999 ERC REPORT 75 _. . Copyright 1999 the European Conference of Postai and Telecommunications Administrations (CEPT) STD-CEPT ERC REPORT 75-ENGL 3799 232b1i114 00Lb37b 190 ERC REPORT 75 NARROW BAND RETURN PATH TWO WAY PAGING COMPATIBILITY STUDIES IN THE
3、 406.1 - 410 MHz, 440 - 470 MHz AND 862 - 871 MHz BANDS EXECUTIVE SUMMARY This report is the final report of CEPT Project Team SE33 concerning compatibility studies on the allocation of spectrum for return path Two Way Paging (TWP) narrow band channels. SE33 was requested to perform analysis on the
4、frequency bands listed below: I. 406.1 -410 MHz II. 440 - 470 MHz iii 862 - 871 MHz To perform co-existence and compatibility studies SE33 used two techniques to develop conclusions on identifying a suitable spectrum allocation. These are a methodology developed in SE33 which is described in detail
5、in the report, and a Monte Carlo analysis based on the Monte Carlo analysis tool developed in WGSE. In order to gain a greater degree of confidence in its findings SE33 has also performed where appropriate, additional adjacent band analysis of operational services with TWP. Conclusions SE33 makes th
6、e following conclusions regarding the allocation of spectrum for Narrowband TWP channels: 1. 406.1 - 410 MHz SE33 concludes that sharing between TWP and Radioastronomy services in the 406.1 - 410 MHz band will be subject to very large co-ordination distances. 2. 440 - 470 MHz 4 440 - 450 MHz The res
7、ults in this report are presented as separation distances which are comparable to those in the 450 - 470 MHz band but coordination would be subject to smaller distances. However due to the fact the methodology used is based on worst case assumptions, the actual separation distances are expected to b
8、e lower than those calculated. These distances could be reduced by the use of planning andlor site engineering. b) 450 - 470 MHz The results in this report are presented as separation distances which can be considered large. However due to the fact the methodology used is based on worst case assumpt
9、ions, the actual separation distances are expected to be lower than those calculated. These distances could be reduced by the use of planning andor site engineering. 3. 862 - 871 MHz Based on the results of these studies and the diminishing usage of CT2 the band 867.6 - 868.0 MHz is considered feasi
10、ble for TWP. However, it should be noted that for countries who deploy Tactical Radio Relay systems based on the parameters in the Report, sharing is not considered feasible. It is not desirable to use two-way paging in the 867.6 - 868.0 MHz band if channel 69 television transmissions are to be used
11、. The uncertainty of use of channel 69 is discussed in section 3.4.1. STD-CEP? ERC REPORT 75-ENGL 1777 m 232b414 001b377 527 ERC REPORT 75 Narrow band Return Path Two Way Paging Compatibility Studies in the 406.1 . 410 MHz. 440 . 470 MHz and 862-871 MHz bands INDEX TABLE 1 INTRODUCTION 1 2 SCOPE OF
12、ACTIVITIES . 1 2.1 2.2 440-470MHz . 1 2.3 862 - 871 MHz . 1 406.1 - 410 MHz 3 SHARING STUDIES . 1 406.1 - 410 MHz Band 1 Additional information on the protection of the lower adjacent band 406 - 406.1 MHz 3 Conclusion of Sharing in the 406.1 - 410 MHz band . 3 3.1 3.1.1 3.1.2 3.1.3 Sharing with radi
13、o astronomy in 406.1 - 410 MHz 2 3.2 440-470MHzBAND . 3 450 - 470 MHz . 3 3.2.1 3.2.1.1 Sharing with TETRA 4 3.2.1.2 Conclusions of sharing in the 450 - 470 MHz band . 7 440 - 450 MHz . 7 3.2.2.1 Conclusions 11 862 to 87 1 MHz Band 11 862 - 863 MHz Emergency services 11 863 - 865 MHz Wireless Audio
14、Applications 11 864.1 - 868.1 MHz CT2 services 12 Monte Carlo analysis from CEPT SE33FM35 (98)35 . 16 ReFLEX Subscriber Unit interfering with a CT2 Mobile Station . 17 ReFLEiX Subscriber Unit interfering with a CT2 Base Station 18 CT2 Mobile Station interfering with a ReFLEX Base Station 18 CT2 Base
15、 Station interfering with a ReFLEX Base Station . 21 Analysis of results . 23 3.2.2 3.3 3.3.1 3.3.2 3.3.3 3.3.3.1 3.3.3.1.1 3.3.3.1.2 3.3.3.1.3 3.3.3.1.4 3.3.3.1.5 3.3.3.2 Conclusion of Sharing in the 864.1 868.1 MHz band . 23 868 - 870 MHz SRD Short Range Devices 24 Compatibility studies with TV Br
16、oadcast services . 24 3.3.4 3.3.5 870 to 871 MHz 24 3.4.1 Theoretical calculations 24 3.4.2 Analogue TV Transmitter Measurements . 26 3.4.3 Conclusions 28 Sharing with Tactical Radio Relay systems 29 3.5.1 Introduction 29 3.5.2 Parameters used for simulation . 29 3.5.3 Compatibility analysis 30, 3.5
17、.4 Conclusion 31 3.4 3.5 STD.CEPT ERC REPORT 75-ENGL L779 H 232bliLLi OOLb37a Bb3 ERC REPORT 75 Page I 1 INTRODUCTION This report is the final report of CEPT Project Team SE33 concerning compatibility studies on the allocation of spectrum for return path Two Way Paging (TW) narrow band channels (the
18、 TOR of SE33 is attached in Annex 1). The report describes in detail the methodology and processes used to determine which spectrum could be suitable for TWP and the sharing criteria required in order to provide a commercial TWP service. The report is not intended to provide detail of all the compat
19、ibility studies performed in SE33 but highlights the important work used to formulate the conclusions of SE33. The reader is referenced to two main reports produced in SE33; CEPT SE33/FM35(99)36revlL Sharing studies to identify suitable Return Path frequencies for the ETSI TWP Narrow Band Standard a
20、nd CEPT SE33/FM35(98)35 A Compatibility Study of ReFLEX Sharing with CT2 in the Band 864.1 - 868.1 MHz and TETRA in the Bands 870 - 876 MHz and 915 - 921 MHz adjacent to GSM, GSM-R, SRD and CAD Bands where further details can found regarding technical analysis. 2 SCOPE OF ACTIVITIES SE33 was request
21、ed to perform analysis on the frequency bands listed below with general usage listed as described in the ECA Table, though is noted that national usage can be significantly different across the CEPT: 2.1 2.2 2.3 406.1 - 410 MHz Radio Astronomy Land Mobile - single frequency 440 - 470 MHz 440 - 450 M
22、Hz Land Mobile - analogue Median path loss L = -15.8 + 41.77 log d dB (where d is in meters) 57 km 94 km 145 km 240 km Table 3. Protection distances required between a Two-way pager operating in the 406.1 - 410 MHz Band and a Radio Astronomy site. The figures in Table 3 are basically in line with th
23、e paper submitted by the UK CEPT SE33/FM35(98)3 “United Kingdom services in the band 406 - 410 MHz” In the UK there are eight Radio Astronomy user sites and there is a 100 km co- ordination zone around each. 3.1.2 In addition, care must be taken for future systems in the band 406.1 - 410 MHz in orde
24、r not to cause harmful degradation to the Cospas-Sarsat system in the band 406 - 406.1 MHz. This band is dedicated to search and rescue and it is clearly stated that lMHZ -6OdBC -60dBC -6OdBC -6OdBc - 66 BC - 70 Bc - 70 Bc - 70 Bc - 66 Bc - 7OdBc - 70 Bc - 70 Bc - 75 dBc - 78 Bc - 80 Bc - 8OdBc - 82
25、 Bc - 85 Bc - 85 Bc - 80 Bc - 8OdBc - 85 Bc -9OdBC - 90 dBc -9OdBC - 1oodBc - 100dBc - 100dBc Table 4. Parameters used to model the TETRA System Frequency offset 30 Bm Mobile 35 dBm Mobile 40 dBm Mobile 44 dBm Base Station ShtiOn statim Station Table 5. Unwanted Emissions relative to carrier for the
26、 bandwidth of 18 Wz) TETRA System (measurement) STD-CEFT ERC REPORT 75-ENGL 1779 232b4lti 00Lb382 274 E Parameter Channel Spacing ERC REPORT 75 Page 5 Mobile Station (Transmit) 12.5 kHz i 25 kHz Base Station (Receive) 12.5 kHz i 25 kHz Receiver Bandwidth I 10.5 kHz i 18 kHz Antenna Height Antenna Ga
27、in Active Interferer Density Range Receiver Sensitivity (dynamic) Receiver Protection Ratio Power Control Characteristic Table 6- Parameters Assumed for 12.5 kHz / 25 kHz ETSI Two-way Narrow Band Return Channel System 1.5 m 30 m -12 dBi 6 dBi Variable a theoretical method based on TV spectrum masks
28、and using a mask based on UK monitoring of TV broadcast emissions (CER SE33M35 (99) 40 Television Transmitter Out of Band Radiation Emissions in the UK”, as described in the sections below. Compatibility studies with TV Broadcast services 3.4.1 Theoretical calculations The effect of Television trans
29、missions were ais0 studied by SE33. Television transmitters have high power transmitters and it was thought could be a source of interference to the very sensitive Two-way paging base station receivers. Data from the liaison statement to ITU-R TG 1/5 from WP 11C was used. This data gave the paramete
30、rs of the analogue TV 8 MHZ spectrum mask for out of band emissions The path loss model from CEPT/ERC/SE(97)30 was used for the open space environment together with the Minimum Coupling Loss method. STD*CEPT ERC REPORT 75-ENGL 1799 E 232bqLLi OOLbi02 902 = Frequency Offset (MHz) 6.94 13 14.75 22.75
31、ERC REPORT 75 Page 25 Transmitter Power 0.1 kw 1 kw 10 kw 100 kw 173 km 537 km 776 km 1584 km 114 km 239 km 501 km 1032 km 60 km 125 km 257 km 537 km 9km 20 km 42 km 87 km The separation distances calculated by SE33 vary quite considerably with frequency offset reflecting the steps in the TV transmi
32、tters base station unwanted emission characteristics. Considering the effect of TV transmitter output power then Table 24 was created. Channel Number 66 67 68 69 The actual frequency with the offset defined (MHz) 6.94 MHz 13 MHz 14.75 MHz 22.75 MHz 838.19 844.25 846 854 846.19 852.25 854 862 854.19
33、860.25 862 870 862.19 868.25 870 87 8 Table 24. The Impact of TV transmitter power on the Variation in Physical Separation with Frequency Offset assuming open space path loss model and “analogue TV 8 MHz mask” and no Site Engineering is used (TV transmitter base station to Paging receiver base stati
34、on) Frequency Offset (MHz) 6.94 13 14.75 22.75 These offset frequencies were mapped onto the TV channel frequencies. Thus Table 25 was created and the overlap into the 867.6 - 868 MHz band identified. Transmitter Power 0.1 kw 1 kw 10 kw 100 kw 87 km 173 km 537 km 776 km 56 km 114km 239 km 501 km 29
35、km 60 km 125 km 257 km 5km 9km 20 km 42 km Table 25. The actual frequencies represented by a defined set of offsets from the TV vision carrier frequency by TV channel number. From Table 25 it can be seen that at offsets of 13, 14.75 and 22.75 MHz TV channel 69 would give problems to a Two- way pagin
36、g service with a return channel in the 867.6 - 868 MHz band. These problems from channel 69 would be difficult to overcome . At an offset of 22.75 MHz it can be seen that channel 68 can be a problem. Table 24 shows the separation required. If the effect of reducing the paging base station receiver s
37、ensitivity is considered to help overcome any problems in the region of the TV transmitter then a new Table 26 can be created. In this table the paging base station receiver is assumed to have a sensitivity of -1 17 dBm which is a reduction of 10 dB . This would result in reducing the range from the
38、 pager to the base station on the return channel by half (e.g. from 12 km to 6 km). This would mean four base station receiver sites instead of one in a region that could be affected by a TV transmitter. Table 26. The Impact of TV transmitter power on the Variation in Physical Separation with Freque
39、ncy Offset assuming open space path loss model and “analogue TV 8 MHz mask” and no Site Engineering is used (TV transmitter base station to Paging receiver base station). In the location of the TV transmitter the number of Paging Base stations is increased by a factor of four. STD-CEPT ERC REPORT 75
40、-ENGL 1999 m 232brlLLi 00Lbi103 8Li9 m ERC REPORT 75 Page 26 Channel Number 65 66 67 68 69 Number of Tx.s Highest Power Tx. Lowest Power Tx. ? 500 kilowatts 1 watt 47 250 kilowatts 1 watt 35 100k kilowatts 4 watts 60 100k kilowatts 0.5 watt o Table 27. TV transmitters in the UK Table 28. TV transmit
41、ters in the UK 3.4.2 Analogue TV Transmitter Measurements Most analogue TV transmitters, operating in Channel 68 are low power relays. There are only 3 transmitters with ERPs of 40 dBW and above. Of these, Midhurst has the highest transmit power, so it was chosen to represent the analogue worst case
42、. Transmitter Specifications for Midhurst, West Sussex NGR SU 912 250 (ground height approx. 190 m ASL) Antenna Height 300 m ASL (mast height approx. 115 m) Channel: 68 (Vision Carrier 847.250 MHz) Vision Carrier Offset: Negative at 20 /12 Line Frequency ERP: 50 dBW (peak sync.) Horizontal Polarisat
43、ion Measurement Location NGR: SU906249 (ground height approx. 185 m) Distance to Transmitter: approx. 600 m Equipment Set Up Chelton Log Periodic Antenna 10 metres above ground with 10 metres of RG214 cable connected to a Rohde & Schwarz ESCS30 Measuring Receiver. Field Strength: Receiver reading + 21.2 dB correction factor. .
