SRSP-310.5 — Technical Requirements for Fixed Line-of-Sight Radio Systems Operating in the Band 10.55-10.68 GHz

Issue 3
May 2012

Spectrum Management and Telecommunications
Standard Radio System Plan

Preface

Issue 3 of SRSP-310.5 has been released to provide a number of clarifications. This issue replaces SRSP-310.5, Issue 2.

The following are the main changes:

  1. Text was added to clarify that multipoint communication system (MCS) hub station transmitters are restricted to the lower half of the band and that MCS remote station transmitters are restricted to the upper half of the band (Section 5.2).
  2. The language in Section 5.4.1 has been updated and a figure has been added to clarify the intent.
  3. The minimum antenna directivity requirements in Table 4 have been corrected and are now consistent with the figure (Annex 1).
  4. A number of additional updates and editorial corrections have been made.

Issued under the authority of
the Minister of Industry

original signed by
Marc Dupuis
Director General
Engineering, Planning and Standards Branch

Contents

1. Intent

1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the band 10.55-10.68 GHz by low-capacity (LC) multipoint communications systems (MCS) and point-to-point radio systems in the fixed service using digital modulation.

1.2 This SRSP is intended to be employed in the design and specification of radio systems and equipment, as well as in the evaluation of technical applications for new radio facilities or modification to radio systems submitted in accordance with the current issue of Radio Standards Procedure RSP-113, Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service.

1.3 This SRSP specifies equipment characteristics related to efficient spectrum usage only and is not to be regarded as a comprehensive specification for equipment design and/or selection.

2. General

2.1 This SRSP replaces SRSP-310.5, Issue 2. Further revisions to this SRSP will be made as required.

2.2 Existing MCS and point-to-point radio systems operating in the band 10.55-10.68 GHz and licensed as standard prior to the issuance of this SRSP may continue to operate as standard. Extensions and/or expansion of these systems will be considered by Industry Canada on a case-by-case basis. New stand-alone radio routes must conform to the requirements of this SRSP.

2.3 Radio systems that conform to these technical requirements will be given licensing priority over non-standard radio systems operating in this band.

2.4 The arrangements for non-standard systems are outlined in SP Gen, General Information Related to Spectrum Utilization and Radio System Policies.

2.5 The Geographical Differences Policy (GDP) guideline applies in this frequency band. Additional information on the GDP can be found in SP1-20 GHz.1

2.6 Although a radio system may conform to the requirements of this SRSP, modifications may be required to the system whenever harmful interference2 is caused.

2.7 When potential interference between radio systems cannot be resolved by the parties concerned, Industry Canada should be advised. After consultation with these parties, the Department will determine the necessary modifications and schedule of modifications to resolve the conflict.

2.8 Industry Canada may require the licensees and/or applicants to use receiver selectivity characteristics that provide rejection of harmful interference.

2.9 The use of a two-frequency plan is required. Where reasonable economic or technical justification is provided (e.g. where siting prevents adequate antenna discrimination), extra frequencies may be used to resolve the problem, subject to the provisions of the GDP (see Section 2.5.)

2.10 It should be noted that the fixed service shares the band 10.60-10.68 GHz with the Earth exploration-satellite (passive), radio astronomy and space research (passive) services on a co-primary basis.

2.11 Where a high demand for use of this band is expected, the Department may require system changes to ensure efficient use of the spectrum.

2.12 MCS and point-to-point systems will share this band. Distinct specifications are set forth for both types of applications in this SRSP to ensure efficient use of the spectrum and to ease frequency coordination.

2.13 Multipoint systems that use point-to-point radio equipment in the initial implementation must be designed such that the equipment can be directly replaced by multipoint equipment in the future. The Department may request this replacement upon receipt of a request for system expansion.

3. Related Documents

The current issues of the following documents are applicable, and are available on the Spectrum Management and Telecommunications website at www.ic.gc.ca/spectrum .

_________________________
CPC – Client Procedures Circular
RSP – Radio Standards Procedure
SP – Spectrum Utilization Policy
TRC – Telecommunications Regulation Circular

4. Point-to-Point Systems

4.1 Radio Frequency (RF) Channel Arrangements

RF channels are allocated in bandwidths of 1.25 MHz, 2.5 MHz and 5 MHz with a common 65 MHz transmit-receive separation.

4.2 RF Channel Centre Frequencies

4.2.1 The centre frequencies of the 13 paired channels that allow RF channel bandwidths greater than 2.5 MHz and less than or equal to 5 MHz are expressed by the following relationships:

Lower half of band, An = 10552.5 + 5 (n - 1) for n = 1 to 13

Upper half of band, A’n = 10617.5 + 5 (n - 1) for n = 1 to 13

where n is the channel number, and An and A’n are the centre frequencies of the paired channels.

4.2.2 The centre frequencies of the 26 paired channels that allow RF channel bandwidths greater than 1.25 MHz and less than or equal to 2.5 MHz are expressed by the following relationships:

Lower half of band, Bn = 10551.25 + 2.5 (n - 1) for n = 1 to 26

Upper half of band, B’n = 10616.25 + 2.5 (n - 1)for n = 1 to 26

where n is the channel number, and Bn and B’n are the centre frequencies of the paired channels.

4.2.3 The centre frequencies of the 52 paired channels that allow RF channel bandwidths of 1.25 MHz or less are expressed by the following relationships:

Lower half of band, Cn = 10550.625 + 1.25 (n - 1) for n = 1 to 52

Upper half of band, C’n = 10615.625 + 1.25 (n - 1)for n = 1 to 52

where n is the channel number, and Cn and C’n are the centre frequencies of the paired channels.

4.3 Branching or Spur Route Channels

The frequencies assigned to a main route system should be reused on the branching or spur routes where possible. The siting of repeater stations should be planned with this requirement in mind in order to ensure sufficient antenna discrimination at the branch-off angle.

4.4 Closed Loop

Systems must be designed so that any closed loop will consist of an even number of hops.

4.5 Growth Patterns

New radio systems in this band should normally use the lowest available frequency pair that can be successfully coordinated, and grow in an orderly manner towards the upper frequency channels. However, due to varying conditions and circumstances across Canada, regional offices may assign frequencies using a procedure different from the one described above, at their own discretion.

4.6 Spectral Efficiency

Systems submitted for licensing must have the capability of achieving a spectral efficiency of at least 1 bit/second/Hz of RF channel bandwidth on a single polarization.

4.7 Protection Channels

4.7.1 One protection channel will normally be permitted for systems with more than one working channel.

4.7.2 Quad-path diversity3 applications will be considered on a case-by-case basis to solve special propagation problems.

4.8 Transmission Characteristics

4.8.1 The transmit power delivered to the antenna input port must not exceed the limits specified in Table 1 for GO and RETURN channels.

Table 1: Transmit Power at the Antenna Port for Point-to-Point Stations
Channels from 10.55 GHz to 10.60 GHz
Power Limit
(dBW) (watts)
Transmit power at the antenna port (bandwidth of 5 MHz) 0 1
Transmit at the antenna port (bandwidth of 2.5 MHz) -3 0.5
Transmit power at the antenna port (bandwidth of 1.25 MHz) -6 0.25
Channels of 10.60 to 10.68 GHz
Transmit power at the antenna port[1] (per channel) -15 0.03

Note 1: In the case of systems using Automatic Transmit Power Control (ATPC), the maximum transmitter power at the antenna port may be increased by a value corresponding to the ATPC range, up to a maximum of -3 dBW.

4.8.2 An increase in transmit power over the above-specified limits may be permitted on an exceptional basis. In no event shall the power delivered to the antenna be permitted to exceed 20 watts (+13 dBW) per RF channel.

4.8.3 The centre frequency of the emission shall be maintained within ±0.005% of the assigned frequency.

4.9 Emission Limits

4.9.1 In any 4 kHz band, where the centre frequency is removed from the assigned frequency by more than 50% up to and including 250% of the authorized bandwidth, the mean power of emission shall be attenuated below the mean output power of the transmitter in accordance with the following equation:

A = 35 + 0.8 (P - 50) + 10 log10B (dB)

where: A = attenuation (dB) below the mean output power level

P = percent removed from the centre frequency of the assigned RF channel

B = authorized bandwidth (MHz)

Notes: 1. In no case shall the attenuation be less than 50 dB.

2. Attenuation greater than 80 dB or to an absolute power of less than -13 dBm/MHz is not necessary.

4.9.2 In any 4 kHz band, where the centre frequency is removed from the assigned frequency by more than 250% of the authorized bandwidth, the mean power of emission shall be attenuated by 43 + 10 log10 (mean output power in watts) dB, or 80 dB, whichever is the lesser attenuation.

4.10 Maximum Elevation Angle

In the band 10.60-10.68 GHz, the antenna elevation angle shall not exceed 20°.

4.11 Antenna Characteristics

The co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within the envelope shown in Annex 1 for both vertical and horizontal polarizations.

5. Multipoint Communications Systems (MCS)

5.1 Multiple Bandwidths

RF channels are allocated in bandwidths of 2.5 MHz and 5 MHz, with a common 65 MHz transmit-receive separation.

The applicant is permitted to divide the assigned RF channel or channels into any number of sub-channels for sectorized communication systems.

5.2 MCS Frequency Allocations

In the following channel plans, remote station transmitters are restricted to the upper half of the band and hub station transmitters are restricted to the lower half of the band.

5.2.1 The centre frequencies of the channel allocations for radio systems using channels of greater than 2.5 MHz and less than or equal to 5 MHz are expressed by the following relationships:

Lower half of band (hub transmit), Dn = 10552.5 + 5 (n - 1) for n = 1 to 13

Upper half of band (remote transmit), D’n = 10617.5 + 5 (n - 1) for n = 1 to 13

where n is the channel number, and Dn and D’n are the centre frequencies of the paired channels.

5.2.2 The centre frequencies of the channel allocations for radio systems using channels less than or equal to 2.5 MHz are expressed by the following relationships:

Lower half of band (hub transmit), En = 10551.25 + 2.5 (n - 1) for n = 1 to 26

Upper half of band (remote transmit), E’n = 10616.25 + 2.5 (n - 1) for n = 1 to 26

where n is the channel number, and En and E’n are the centre frequencies of the paired channels.

5.2.3 To facilitate sharing with the Earth exploration-satellite service (passive) to the extent possible, licences for transmit hub stations will be issued only for channels from 10.55 GHz to 10.60 GHz. Channels above 10.60 GHz may be assigned when channels from 10.55 GHz to 10.60 GHz are not available.

5.3 Spectral Efficiency

Systems submitted for licensing must have the capability of achieving a spectral efficiency of at least 1 bit/second/Hz of RF channel bandwidth on a single polarization.

5.4 Transmission Characteristics for Hub and Remote Stations

5.4.1. The transmit power delivered to the antenna input and the e.i.r.p. from the antenna must not exceed the limits specified in Table 2 for channels from 10.55 GHz to 10.60 GHz, and in Table 3 for channels from 10.60 GHz to 10.68 GHz:

Table 2: Transmit Power at the Antenna Port of Channels from 10.55 GHz to 10.60 GHz
Hub Stations Only[1]
Power Limit
(dBW) (watts)
Transmit power at the antenna port (per 250 kHz)[2] -3 0.50

Note 1: Remote station transmitters are not permitted in the lower half of the band (see Section 5.2).

Note 2: The stated powers in watts are the peak envelope power of emission measured at the associated antenna input port.

Table 3: Transmit Power at the Antenna Port and EIRP of Channels from 10.60 GHz to 10.68 GHz
Hub Stations
Vertical Angle[1] Power Limit
(degrees) (dBW) (watts)
Transmit power at the antenna port[2] (per channel) N/A -7 0.20
e.i.r.p. (per channel) N/A +40 10 000
Off-axis e.i.r.p. (per channel) ≤ 20 +40 10 000
> 20 and ≤ 45 -6 0.25
> 45 and < 90 -11 0.08
90 -13 0.05
Remote Stations
Vertical Angle[1] Power Limit
(degrees) (dBW) (watts)
Transmit power at the antenna port[2, 3] (per channel) N/A -8 0.16
e.i.r.p. (per channel) N/A +40 10 000
Off-axis e.i.r.p. (per channel) ≤ 45 +40 10 000
> 45 -18 0.016

Note 1: The vertical angle specified here is in degrees from the horizontal plane, independent of the antenna elevation. For example, for a hub station antenna with an elevation of -1°, a vertical angle of 45° would correspond to an off-axis angle of 46° in the vertical plane. This example is illustrated in Figure 1, below.

Figure 1: Example of elevation, off-axis and vertical angles
Photo of Figure 1: Example of elevation, off-axis and vertical angles

[Description of Figure 1]

Note 2: The stated power in watts is the peak envelope power of emission measured at the associated antenna input port.

Note 3: For the remote stations only, in the case of point-to-multipoint systems using ATPC, the maximum transmit power at the antenna port may be increased by a value corresponding to the ATPC range, up to a maximum of -3 dBW. The e.i.r.p. and off-axis e.i.r.p. limits are unchanged when ATPC is used.

5.4.2 The maximum frequency tolerance for hub station transmitters is ±0.0001%, whereas it is ±0.0003% for remote station transmitters. The maximum frequency tolerance for MCS using point-to-point radios is ±0.0001%.

5.5 Emission Limits

5.5.1 In any 4 kHz band, where the centre frequency is removed from the edge of the assigned RF channel by up to and including 1.125 times the sub-channel bandwidth of the assigned RF channel, the attenuation shall be defined by the following equation, but in no event shall it be less than 50 + 10 log10N decibels.

A = 50 + 0.0333(F - 0.5B) + 10 log10N (dB)

where: A = attenuation (in dB) below mean output power level contained within the assigned RF channel for a given polarization

B = bandwidth of the assigned RF channel (in kHz)

F = absolute value of the difference between the centre frequency of the 4 kHz band measured and the centre frequency of the assigned RF channel (in kHz)

N = number of active sub-channels of the given polarization within the assigned RF channel

5.5.2 In any 4 kHz band within the 10.55-10.68 GHz band, where the centre frequency is removed from the centre frequency of the assigned RF channel by more than the sum of 50% of the assigned RF channel bandwidth plus 1.125 times the sub-channel bandwidth, the attenuation shall be defined by the following equation, but in no event shall it be less than 80 dB.

A = 80 + 10 log10N (dB)

5.5.3 In any 4 kHz band, where the centre frequency is outside the 10.55-10.68 GHz band, the attenuation will be at least 43 + 10 log10 (mean output power in watts) (dB).

5.6 Remote Station Antenna Characteristics

The co-polarized radiation pattern envelope in the horizontal plane of the remote station antenna must remain within the envelope shown in Annex 1 for both vertical and horizontal polarizations.

6. Maximum Equivalent Isotropically Radiated Power (e.i.r.p.)

The maximum e.i.r.p. from the antenna of MCS or point-to-point systems must not in any case exceed +40 dBW per RF channel.

Annex 1: Minimum Antenna Characteristics for Frequency Band 10.55-10.68 GHz


Table 4: Minimum Antenna Characteristics for the Band 10.55-10.68 GHz
Azimuth in Degrees from Main Lobe Antenna Directivity (dB) down from Main Lobe
1.5° 0
20
10° 20
20° 27
40° 35
140° 35
140° 38
180° 38

Annex 2: Channel Identification and Carrier Frequencies for Paired Radio Systems with Transmit-Receive Spacing of 65 MHz Operating in the Band 10.55-10.68 GHz

Table 5: Channel Identification and Carrier Frequencies for Paired Radio Systems with Transmit-Receive Spacing of 65 MHz Operating in the Band 10.55-10.68 GHz
Frequency (MHz) Point-to-Point GO (RETURN) MCS Hub Stations Frequency (MHz) Point-to-Point RETURN (GO) MCS Remote Stations
Channel Bandwidth (MHz) Channel Bandwidth (MHz)
5 2.5 1.25 5 2.5 5 2.5 1.25 5 2.5
10550.625     C1     10615.625     C’1    
10551.250   B1     E1 10616.250   B’1     E’1
10551.875     C2     10616.875     C’2    
10552.500 A1     D1   10617.500 A’1     D’1  
10553.125     C3     10618.125     C’3    
10553.750   B2     E2 10618.750   B’2     E’2
10554.375     C4     10619.375     C’4    
10555.000           10620.000          
10555.625     C5     10620.625     C’5    
10556.250   B3     E3 10621.250   B’3     E’3
10556.875     C6     10621.875     C’6    
10557.500 A2     D2   10622.500 A’2     D’2  
10558.125     C7     10623.125     C’7    
10558.750   B4     E4 10623.750   B’4     E’4
10559.375     C8     10624.375     C’8    
10560.000           10625.000          
10560.625     C9     10625.625     C’9    
10561.250   B5     E5 10626.250   B’5     E’5
10561.875     C10     10626.875     C’10    
10562.500 A3     D3   10627.500 A’3     D’3  
10563.125     C11     10628.125     C’11    
10563.750   B6     E6 10628.750   B’6     E’6
10564.375     C12     10629.375     C’12    
10565.000           10630.000          
10565.625     C13     10630.625     C’13    
10566.250   B7     E7 10631.250   B’7     E’7
10566.875     C14     10631.875     C’14    
10567.500 A4     D4   10632.500 A’4     D’4  
10568.125     C15     10633.125     C’15    
10568.750   B8     E8 10633.750   B’8     E’8
10569.375     C16     10634.375     C’16    
10570.000           10635.000          
10570.625     C17     10635.625     C’17    
10571.250   B9     E9 10636.250   B’9     E’9
10571.875     C18     10636.875     C’18    
10572.500 A5     D5   10637.500 A’5     D’5  
10573.125     C19     10638.125     C’19    
10573.750   B10     E10 10638.750   B’10     E’10
10574.375     C20     10639.375     C’20    
10575.000           10640.000          
10575.625     C21     10640.625     C’21    
10576.250   B11     E11 10641.250   B’11     E’11
10576.875     C22     10641.875     C’22    
10577.500 A6     D6   10642.500 A’6     D’6  
10578.125     C23     10643.125     C’23    
10578.750   B12     E12 10643.750   B’12     E’12
10579.375     C24     10644.375     C’24    
10580.000           10645.000          
10580.625     C25     10645.625     C’25    
10581.250   B13     E13 10646.250   B’13     E’13
10581.875     C26     10646.875     C’26    
10582.500 A7     D7   10647.500 A’7     D’7  
10583.125     C27     10648.125     C’27    
10583.750   B14     E14 10648.750   B’14     E’14
10584.375     C28     10649.375     C’28    
10585.000           10650.000          
10585.625     C29     10650.625     C’29    
10586.250   B15     E15 10651.250   B’15     E’15
10586.875     C30     10651.875     C’30    
10587.500 A8     D8   10652.500 A’8     D’8  
10588.125     C31     10653.125     C’31    
10588.750   B16     E16 10653.750   B’16     E’16
10589.375     C32     10654.375     C’32    
10590.000           10655.000          
10590.625     C33     10655.625     C’33    
10591.250   B17     E17 10656.250   B’17     E’17
10591.875     C34     10656.875     C’34    
10592.500 A9     D9   10657.500 A’9     D’9  
10593.125     C35     10658.125     C’35    
10593.750   B18     E18 10658.750   B’18     E’18
10594.375     C36     10659.375     C’36    
10595.000           10660.000          
10595.625     C37     10660.625     C’37    
10596.250   B19     E19 10661.250   B’19     E’19
10596.875     C38     10661.875     C’38    
10597.500 A10     D10   10662.500 A’10     D’10  
10598.125     C39     10663.125     C’39    
10598.750   B20     E20 10663.750   B’20     E’20
10599.375     C40     10664.375     C’40    
10600.000           10665.000          
10600.625     C41     10665.625     C’41    
10601.250   B21     E21 10666.250   B’21     E’21
10601.875     C42     10666.875     C’42    
10602.500 A11     D11   10667.500 A’11     D’11  
10603.125     C43     10668.125     C’43    
10603.750   B22     E22 10668.750   B’22     E’22
10604.375     C44     10669.375     C’44    
10605.000           10670.000          
10605.625     C45     10670.625     C’45    
10606.250   B23     E23 10671.250   B’23     E’23
10606.875     C46     10671.875     C’46    
10607.500 A12     D12   10672.500 A’12     D’12  
10608.125     C47     10673.125     C’47    
10608.750   B24     E24 10673.750   B’24     E’24
10609.375     C48     10674.375     C’48    
10610.000           10675.000          
10610.625     C49     10675.625     C’49    
10611.250   B25     E25 10676.250   B’25     E’25
10611.875     C50     10676.875     C’50    
10612.500 A13     D13   10677.500 A’13     D’13  
10613.125     C51     10678.125     C’51    
10613.750   B26     E26 10678.750   B’26     E’26
10614.375     C52     10679.375     C’52    

Footnotes

  1. 1 Spectrum Utilization Policy SP 1-20 GHz, Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz, January 1995, contains spectrum utilization principles, including the GDP guideline. This information will be incorporated into a future issue of SP Gen.
  2. 2 For the purpose of this SRSP, “harmful interference” means interference that endangers the functioning of a radionavigation service or of other safety services, or seriously degrades, obstructs, or repeatedly interrupts a radiocommunication service operating in accordance with regulations and technical requirements laid down by Industry Canada under the Radiocommunication Act.
  3. 3 “Quad-path diversity” refers to the use of frequency diversity and space diversity on the same path.

Description of Images

Figure 1: Example of elevation, off-axis and vertical angles

Shows an example of how to calculate the off-axis angle based on the antenna’s elevation angle and the vertical angle. The antenna horizon line is drawn as a horizontal line. The antenna elevation angle is -1 degrees and is drawn with a line at an angle below the horizon line. The vertical angle is 45 degrees and is drawn with a line at an angle above the horizon line. The off-axis angle is 46 degrees and is shown to be the angle between the antenna elevation angle line and the vertical angle line.

Back to Figure 1

Figure 2: Mimimum Antenna Characteristics Frequency Bands 10.55-10.68 GHz

Shows the antenna radiation pattern limits in dB down from the main lobe for azimuth separations from the main lobe between 0 and 180 degrees.

The y-axis measures antenna directivity in dB down from main lobe from -40 to 0. The x-axis plots azimuth in degrees from main lobe from 0 to 180. There is one plot line which ranges from -38 to 0 on the y-axis. Data points are also given in Table 4. Measured radiation pattern in the horizontal plane must be within these limits for vertical or horizontal polarizations.

Back to Figure 2

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