Td corrigé F.758-2 - Considerations in the development of criteria for ... - ITU pdf

F.758-2 - Considerations in the development of criteria for ... - ITU

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ion over the length of the radio-relay system, and between each interference source, need to be established;
e) that the technical characteristics of each service need to be understood in order to derive interference criteria corresponding to the allowable degradation in performance and availability of the radio-relay system;
f) that performance and availability degradation may result from both long-term and short-term interference and hence both long-term and short-term interference criteria need to be established;
g) that availability of a basic methodology for the development of sharing criteria may be useful to other Study Groups when formulating criteria for sharing with the FS,
recommends
1 that the development of sharing criteria between the FS and other services should be carried out in accordance with the principles described in Annex 1;
2 that the information provided in Annex 2 should be used as guidance to the technical characteristics and sensitive sharing parameters of FS systems that need to be taken into account when developing criteria for sharing with other services;
3 that studies are required to further develop appropriate short-term interference criteria;
4 that further studies are required to derive interference criteria that are appropriate for specific types of new services.
NOTE 1 – Annex 3 describes additional technical characteristics of some FS systems specifically useful for sharing analysis in the 1-3 GHz band.
ANNEX 1
Basic considerations in the development of sharing criteria
1 Overall performance objective
One of the functions of a radiocommunications planner is to design and implement a transmission network which meets the performance objectives laid down by the ITU-T and ITU-R. It is important, therefore, that real systems can meet the appropriate design objectives, recognizing the increasing use of the radio spectrum. There are various ITU-R F-Series Recommendations which relate to the overall performance objective for various types of circuit.
1.1 Error performance and availability objectives
Table 1 gives details of the error performance and availability objectives applicable for high-grade, medium-grade and local-grade portions of an integrated services digital network (ISDN) connection at bit rates below the primary rate utilizing digital radio-relay systems. In addition, the factors to be taken into account when determining error performance objectives for constant bit rate digital paths at or above the primary rate carried by digital radio-relay systems which may form part or all of the international or national portion of a hypothetical reference path are given in Recommendations ITU-R F.1092 and ITU-R F.1189 respectively.
TABLE 1
Digital performance and availability objectives

ObjectiveHypothetical reference digital path (HRDP)High gradeMedium gradeLocal gradeError performanceRec. ITU-R F.594Rec. ITU-R F.634Rec. ITU-R F.696Rec. ITU-R F.697AvailabilityRec. ITU-R F.557Rec. ITU-R F.695Rec. ITU-R F.696Rec. ITU-R F.697

1.2 Analogue performance and availability objectives
Table 2 gives details of the noise limits and availability objectives applicable to analogue radiorelay systems.
TABLE 2
Analogue performance and availability objectives

ObjectiveTelephonyTelevisionTrans-horizonNoise in hypothetical reference circuit (HRC)Rec. ITU-R F.393Rec. ITU-R F.555Rec. ITU-R F.397Noise in real linksRec. ITU-R F.395–Rec. ITU-R F.593AvailabilityRec. ITU-R F.557––
2 Sub-division of the performance and availability objectives
The previous section dealt with the overall performance objectives for digital and analogue reference connections. However, there are, in practice, a large number of potential sources of interference contributing to the degradation of performance of a radio-relay system. In order to move towards a practical method for planning, the overall performance objectives need to be sub-divided between individual sections of the overall HRC. Within a section, the performance objective is then apportioned between the various sources.
2.1 Apportionment of section performance objective
This is covered in Recommendation ITU-R F.1094. The allowable degradation is divided into an element of X% for the FS portion, Y% for frequency sharing on a primary basis, and Z% for all other sources of interference (it should be noted that X% +ð Y% +ð Z% =ð 100%). In the case of sharing with the fixed-satellite service (FSS), typically, Y =ð 10% (e.g. Recommendation ITUR SF.615).
There may be a further sub-division of the X% allowance to suit local requirements and this could be apportioned in such a way as to suit the grade of service.
A particular point to note is that an interference source (say a transmitter (Tx)) may affect more than one hop of a system.
3 Characteristics of interference
It is necessary to have information available on interference levels arising from other services, which would degrade system performance by specific amounts. This would be facilitated if, with the assistance from other Study Groups, a table were compiled giving information on the characteristics of emissions.
Two categories of interference are worth considering:
– the interference arising from services sharing on a primary basis that is likely to be within the receiver (Rx) bandwidth from analogue or digital modulations, in either carrier wave or burst emissions. Reference can be made to existing text where available in ITU-R F-Series and SF-Series Recommendations (e.g. Recommendation ITUR SF.766);
– emissions from systems other than those sharing on a primary basis that could be numerous and diverse, and may be considered in a similar way to the spurious emissions.
Ultimately, another table could be prepared, again with the assistance of other Radiocommunication Study Groups, which compares levels of interference or Gaussian noise required to produce a specified degradation in the channel performance.
4 Limit values of interference
Following the considerations in the previous sections, one may now determine the limit values of interference allowable to a particular source. This has been done for the case of frequency sharing between the FSS and the FS in the joint workings of Radiocommunication Study Groups 4 and 9, where certain models have been established. These models may be appropriate for frequency sharing between radio-relay systems and other services in general.
Methods for characterizing interference levels into terrestrial radio-relay systems include power flux-density (pfd), power level at the input to the antenna or the power level at the receiver input. It is worth noting that both methods are in use in ITU-R SF-Series Recommendations.
A single interference limit value is not adequate because of the time varying nature of the interference. Two limit values, corresponding to a long term (20% of time) and a short term ( 2 ´ð 2 > 8 1.544 6.2 45Channel spacing (MHz)142840501002.5540Antenna gain (maximum) (dBi)45*45*37**323237**37**37**Feeder/multiplexer loss (minimum) (dB)00000000Antenna type Dish, hornDish, hornDishFlat panelFlat panelDishDishDishMaximum Tx output power (dBW)–10–10–10–20–20–10–100e.i.r.p. (maximum) (dBW)3535271515272737Receiver IF bandwidth (MHz)1020Receiver noise figure (dB)2020Receiver thermal noise (dBW)–114–111Nominal Rx input level (dBW)Rx input level for 1 ´ð 10 3 BER (dBW) 100 97Nominal short-term interference (dBW) (% time)Nominal long-term interference (dBW) 140 137Equivalent power (dB(W/4 kHz))Spectral density (dB(W/MHz)) 143 143Refer to Notes(6)(6)(2), (4), (5)(2), (4), (5)* 0.45 m dish assumed.
** 0.3 m dish assumed.
(2) Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor).
(4) The specified interference level is total power within the receiver bandwidth.
(5) 57-59 (TDD), channel spacings should be more than twice that of FDD systems (turn over time).
(6) Sum of capacity for both directions.
TABLE 25
Representative characteristics of P-MP systems operating in the range 30-40 GHz

System No.Hub No. 1Remote No. 1Hub No. 2Remote No. 2Hub No. 3Remote No. 3Hub No. 4Remote No. 4Capacity/data rate (Mbit/s)DS-3 45DS-3 45OC-3 155OC-3 155250250OC-6 310OC-6 310Modulation typeOQPSKOQPSK16-QAM16-QAM64-QAM64-QAM256-QAM256-QAMNecessary bandwidth (MHz)5050505050505050Tx power (dBW)0–135–10777–4Antenna gain (dBi)162918339 to 2339 to 482839Transmit e.i.r.p. (dBW)1616232316 to 3046 to 553535Antenna beamwidth (degrees)45 or 901.945 or 901.715 to 1200.5 to 145 or 901.7Antenna polarizationH/VH/VH/VH/VH/VH/VH/VH/VRx noise figure (dB)77565555Rx noise temperature (K)1 7401 7401 1601 4501 1601 1601 1601 160Rx sensitivity, (1 ´ð 10 6 BER) (dBW) 110 110–102–101–102.9–102.9–90–90Maximum interference (dB(W/MHz))–146.2–146.2–148.0–147.0–148.8–148.8–148.0–148.0
TABLE 26
System characteristics of P-MP systems operating in the range 30-40 GHz

Frequency band (GHz)31.8-33.4Multiple access methodTDMAFDMACDMAModulation2-level4-level16-level4-level8-level16-level2-level4-levelStation typeCSTSCSTSCSTSCSTSCSTSCSTSCSTSCSTSCapacity/transmission rate (Mbit/s)/per sector8 ´ð 2 or equivalent8 ´ð 2 or equivalent16 ´ð 2 or equivalent16 ´ð 2 or equivalent32 ´ð 2 or equivalent32 ´ð 2 or equivalent322482642Channel spacing (MHz)282828282828282828282828Tx necessary bandwidth (MHz)282828282828281.5281.1280.8Antenna gain (maximum) (dBi) Terminal dish/planar 90°ð/45°/15°ð sector planar 14/17/20 41/28 14/17/20 41/28 14/17/20 41/28 14/17/20 41/28 14/17/20 41/28 14/17/20 41/28Feeder/multiplexer loss (minimum) (dB)000000000000Antenna typeSectorDishSectorDishSectorDishSectorDishSectorDishSectorDishAntenna polarizationV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HAntenna beamwidth (3 dB) azimuth/elevation (degrees)>ð 151.2/1.21 >ð 151.2/1.2>ð 151.2/1.2>ð 151.2/1.21 >ð 151.2/1.2>ð 151.2/1.2Maximum Tx output power (dBW) 5 10 5 10 5 10 5 20 5 20 5 20e.i.r.p (maximum with/without ATPC) (dBW)1531/181531/181531/181521/81521/81521/8ATPC  range (dB)10>ð 2010>ð 2010>ð 20151515151515Receiver IF bandwidth (MHz)28282828282828/1.31.328/1.31.128/0.750.75Receiver noise figure (dB)777777777777Receiver thermal noise (dBW) 122.5 122.5 122.5 122.5 122.5 122.5 135 135 137 137 138 138Nominal Rx input level (dBW)Rx input level for 1 ´ð 10 3 BER (dBW) 116.5 116.5 114.5 114.5 105.5 105.5 127 127 126 126 121 121Range of cell radius (km)77552-32-35-65-6442-32-3Typical fade margin (dB)232320201818Availability target (% time)99.9999.9999.9999.9999.9999.9999.9999.9999.9999.9999.9999.99Nominal short-term interference (dBW) (% time)Nominal long-term interference(4), (5) (dBW)–132.5–132.5–132.5–132.5–132.5–132.5–147–147–147–147–147–147Equivalent power (dB(W/4 kHz))Spectral density (dB(W/MHz))–137–137–137–137–137–137Refer to Notes(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)TS: terminal station
(1) For a 2 Mbit/s signal, maximum Tx. Output CS refers to total output.
(2) Code rate 3/4.
(4) Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor).
(5) The specified interference level is total power within the receiver bandwidth.
TABLE 27
System characteristics of P-MP systems operating in the range 30-40 GHz

Frequency band (GHz)37.0-40.0Multiple access methodTDMAFDMACDMAModulation2-level4-level16-level4-level8-level16-level2-level4-levelStation typeCSTSCSTSCSTSCSTSCSTSCSTSCSTSCSTSCapacity/transmission rate (Mbit/s)/ per sector8 ´ð 2 or equivalent8 ´ð 2 or equivalent16 ´ð 2 or equivalent16 ´ð 2 or equivalent32 ´ð 2 or equivalent32 ´ð 2 or equivalent322482642Channel spacing (MHz)282828282828282828282828Tx necessary bandwidth (MHz)282828282828281.5281.1280.8Antenna gain (maximum) (dBi) Terminal dish/planar 90°ð/45°/15°ð sector planar14/17/2041/2814/17/2041/2814/17/2041/2814/17/2041/2814/17/2041/2814/17/2041/28Feeder/multiplexer loss (minimum) (dB)000000000000Antenna typeSectorDishSectorDishSectorDishSectorDishSectorDishSectorDishAntenna polarizationV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HAntenna beamwidth (3 dB) azimuth/elevation (degrees)>ð 151.2/1.21 >ð 151.2/1.2>ð 151.2/1.2>ð 151.2/1.21 >ð 151.2/1.2>ð 151.2/1.2Maximum Tx output power (dBW) 5 10 5 10 5 10 5 20 5 20 5 20e.i.r.p (maximum with/without ATPC) (dBW)1531/181531/181531/181521/81521/81521/8ATPC  range (dB)10>ð 2010>ð 2010>ð 20151515151515Receiver IF bandwidth (MHz)28282828282828/1.31.328/1.31.128/0.750.75Receiver noise figure (dB)888888777777Receiver thermal noise (dBW)–121.5–121.5–121.5–121.5–121.5–121.5–135–135–137–137–138–138Nominal Rx input level (dBW)Rx input level for 1 ´ð 10 3 BER (dBW) 115.5 115.5 113.5 113.5 104.5 104.5 127 127 126 126 121 121Range of cell radius (km)5-65-6442244331-21-2Typical fade margin (dB)232320201818Availability target (% time)99.9999.9999.9999.9999.9999.9999.9999.9999.9999.9999.9999.99Nominal short-term interference (dBW) (% time)Nominal long-term interference(4), (5) (dBW)–131.5–131.5–131.5–131.5–131.5–131.5–147–147–147–147–147–147Equivalent power (dB(W/4 kHz))Spectral density (dB(W/MHz))–137–137–137–137–137–137Refer to Notes(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)(1) For a 2 Mbit/s signal, maximum Tx. Output CS refers to total output.
(2) Code rate 3/4.
(4) Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor).
(5) The specified interference level is total power within the receiver bandwidth.
TABLE 28
FS system parameters for FS frequency sharing between 60 and 70 GHz

Frequency band (GHz)64-66 (FDD)64-66 (TDD)64-66 (FDD)Modulation4-FSK4-FSK4-FSK4-FSK16-QAM4-FSK4-FSK4-FSK4-FSK4-FSK4-FSK4-FSKCapacity (Mbit/s)2 ´ð 282 ´ð 8341552 ´ð 2(x)4 ´ð 2(x)2 ´ð 8(x)4 ´ð 8(x)1.5446.245Channel spacing (MHz)3.571428563.5714282.5540Antenna gain (maximum) (dBi)46*46*46*46*46*46*46*46*46*37**37**37**Feeder/multiplexer loss (minimum) (dB)000000000000Antenna typeDish, hornDish, hornDish, hornDish, hornDish, hornDish, hornDish, hornDish, hornDish, hornDish, hornDishDishMaximum Tx output power (dBW)–20–20–20–20–20–20–20–20–20–10–100e.i.r.p. (maximum) (dBW)252525252525252525272737Receiver IF bandwidth (MHz)24817402.5540Receiver noise figure (dB)121212129101010Receiver thermal noise (dBW)–129–126–123–120–119–130–127–118Nominal Rx input level (dBW)–109 +ð M 106 +ð M 103 +ð M 100 +ð M 98 +ð MRx input level for 1 ´ð 10 3 BER (dBW) 112 109 106 103 101 122 116 107.5Nominal short-term interference (dBW) (% time)Nominal long-term interference (dBW) 139 136 133 130 129–140–137–128Equivalent power (dB(W/4 kHz))Spectral density (dB(W/MHz))–142–142–142–142–145–144–144–144Refer to Notes(2), (4)(2), (4)(2), (4)(2), (4)(2), (4)(2), (4)(2), (4)(2), (4)(x): sum of capacity for both directions
* 0.45 m dish assumed.
** 0.3 m dish assumed.
(2) Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor).
(4) The specified interference level is total power within the receiver bandwidth.
TABLE 29
System characteristics of FS P-MP systems in the range 25-27 GHz

Type 1 (TDD)Type 2 (FDD)Service typeP-MPP-MPFrequency band (GHz)25.25-27.025.25-27.025.25-27.025.25-27.025.25-27.025.25-27.0Multiple accessTDMA/TDDTDMA/TDDTDMA/TDDTDMA/FDDTDMA/FDDTDMA/FDDModulationQPSKQPSKQPSKQPSKQPSKQPSKCapacity (Mbit/s)505050521313Channel spacing (MHz)404040401010CS-OSOS-CSOS-CSCS-OSOS-CSOS-CSConditionClear-airClear-airRain-fadedClear-airClear-airRain-fadedAntenna gain (maximum) (dBi)123535153232Feeder/multiplexer loss (minimum) (dB)600000Antenna type60°ð sectorPlatePlate90°ð sectorPlatePlateMaximum Tx output power (dBW) 11.3 21.3 11.3 4 20 10Maximum Tx P.S.D. (dB(W/MHz))–25.3–35.3–25.3–18.1–28.1–18.1e.i.r.p. (maximum) (dBW)–5.313.723.7111222e.i.r.p spectral density (dB(W/MHz))–19.3–0.39.7–3.13.913.9Receiver IF bandwidth (MHz)32.232.232.233.48.48.4Receiver noise figure (dB)777666Receiver thermal noise (dBW)–122.9–122.9–122.9–122.8–128.8–128.8Rx input level for 1 ´ð 10 6 BER (dBW) 108.9 108.9 108.9 106.8 112.8 112.8Rx Eb/N0 for 1 ´ð 10 6 BER (dB)7.97.97.9131313Nominal long-term interference (dBW)  132.9 132.9 132.9 132.8 138.8 138.8Spectral density (dB(W/MHz)) 146.8 146.8 146.8 146.9 146.9–146.9Refer to Notes(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)(1), (2)OS: out station (subscriber station)
(1) Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor).
(2) Specified interference level is total power within the receiver bandwidth.
TABLE 30
System characteristics of FS P-MP systems operating in the range 30-60 GHz

Frequency band (GHz)51.4-52.6Multiple access methodTDMAFDMACDMAModulation2-level4-level16-level4-level8-level16-level2-level4-levelStation typeCSTSCSTSCSTSCSTSCSTSCSTSCSTSCSTSCapacity/transmission rate (Mbit/s)/ per sector8 ´ð 2 or equivalent8 ´ð 2 or equivalent16 ´ð 2 or equivalent16 ´ð 2 or equivalent32 ´ð 2 or equivalent32 ´ð 2 or equivalent322482642Channel spacing (MHz)282828282828282828282828Tx necessary bandwidth (MHz)282828282828281.5281.1280.8Antenna gain (maximum) (dBi) Terminal dish/planar 90°ð/45°/15°ð sector planar 14/17/2041/28 14/17/2041/28 14/17/2041/28 14/17/2041/28 14/17/2041/28 14/17/2041/28Feeder/multiplexer loss (minimum) (dB)000000000000Antenna typeSectorDishSectorDishSectorDishSectorDishSectorDishSectorDishAntenna polarizationV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HV/HAntenna beamwidth (3 dB) azimuth/elevation (degrees)>ð 151.2/1.21 >ð 151.2/1.2>ð 151.2/1.2>ð 151.2/1.2>ð 151.2/1.2>ð 151.2/1.2Maximum Tx output power (dBW) 10 15 10 15 10 15 5 20 5 20 5 20e.i.r.p (maximum with/without ATPC) (dBW)1026/131026/131026/131521/81521/81521/8ATPC  range (dB)10>ð 1510>ð 1510>ð 15151515151515Receiver IF bandwidth (MHz)28282828282828/1.31.328/1.31.128/0.750.75Receiver noise figure (dB)101010101010777777Receiver thermal noise (dBW) 119.5 119.5 119.5 119.5 119.5 119.5 135 135 137 137 138 138Nominal Rx input level (dBW)Rx input level for 1 ´ð 10 3 BER (dBW) 113.5 113.5 111.5 111.5 102.5 102.5 127 127 126 126 121 121Range of cell radius (km)442-32-3
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