SRSP-305.9 — Technical Requirements for Fixed Line-of-Sight Radio Systems Operating in the Band 5925-6425 MHz

Issue 5
December 2006

Spectrum Management and Telecommunications
Standard Radio System Plan

Preface

Issue 5 of SRSP-305.9 has been released to incorporate refinements to the minimum antenna characteristics and emission limits. This SRSP replaces SRSP-305.9, Issue 4.

Issued under the authority of
the Minister of Industry

space to insert signature
R.W. McCaughern
Director General
Spectrum Engineering Branch

Contents

1. Intent

1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the band 5925-6425 MHz by low, medium and high-capacity (LC, MC and HC) 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 and 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 113, Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service (RSP-113).

1.3 This SRSP specifies equipment characteristics relating 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 Standard replaces SRSP-305.9, Issue 4. Further revision of this SRSP will be made as required.

2.2 Existing point-to-point radio systems operating in the band 5915-6425 MHz and licensed as standard prior to the issuance of this SRSP may continue to operate as standard. Footnote 1Extension and/or expansion of these systems may be permitted. Appendix 1 provides information on additional frequency assignments that are no longer available for new stand-alone radio routes. New stand-alone radio routes must conform to the requirements of this Standard.

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

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

2.5 The Geographical Differences Policy (GDP) guideline applies in this frequency band. More information on the GDP can be found in SP 1-20 GHz. Footnote 2

2.6 Although a radio system may conform to the requirements of this SRSP, modifications may be required to that system whenever harmful interferenceFootnote 3 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 The Department may require 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 Section 2.5.

2.10 It should be noted that the fixed service shares this band equally on the basis of primary status with the fixed-satellite (Earth-to-space) service.

3. Related Documents

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

SP 3-30 GHz
Revisions to Spectrum Utilization Policies in the 3-30 GHz Frequency Range and Further Consultation

SP 1-20 GHz
Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz

SP Gen
General Information Related to Spectrum Utilization and Radio Systems Policies

RSP-113
Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service

TRC-43
Notes Regarding Designation of Emission (Including Necessary Bandwidth and Classification), Class of Station and Nature of Service

CPC-2-0-03
Environmental Process, Radiofrequency Fields and Land-Use Consultation

_____________________________
CPC - Client Procedures Circular
RSP - Radio Standards Procedure
SP - Spectrum Utilization Policy
TRC - Telecommunications Regulation Circular

4. Radio Frequency Channel Arrangement Description

RF channels are designated in bandwidths of 2.5 MHz, 3.75 MHz, 5 MHz, 10 MHz and 30 MHz.

4.1 High-capacity (HC) Radio Frequency Channel Arrangements

The centre frequencies of the RF channel designations for HC radio systems operating in the 5925-6425 MHz band are shown in Table 1.

Table 1: Channel Identification and Carrier Frequencies for Radio Systems Using 30 MHz Wide Channels
GO (RETURN) Frequencies (MHz) RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
A1 5945.20 A1' 6197.24
A2 5974.85 A2' 6226.89
A3 6004.50 A3' 6256.54
A4 6034.15 A4' 6286.19
A5 6063.80 A5' 6315.84
A6 6093.45 A6' 6345.49
A7 6123.10 A7' 6375.14
A8 6152.75 A8' 6404.79

Channels A7/A7' and A8/A8' are set aside for narrow bandwidth systems and should be used only if all other channels are unavailable. New HC systems in this band should use the lowest available frequency pair that can be successfully coordinated starting at channel A1/A1'.

4.2 Medium-capacity (MC) Radio Frequency Channel Arrangements

It should be noted that the channel separations are not exactly the sizes given in the table headings. In addition, not all channels are evenly spaced. The usual channel spacing for each bandwidth is 29.65 MHz for 30 MHz channels, 9.88 MHz for 10 MHz channels, 4.94 MHz for 5 MHz channels, 4.94 MHz for 3.75 MHz channels, and 2.48 MHz for 2.5 MHz channels.

The centre frequencies of the RF channel designations for MC radio systems operating in the 5925-6425 MHz band are shown in Table 2.

Table 2: Channel Identification and Carrier Frequencies for Radio Systems Using 10 MHz Wide Channels
GO (RETURN) Frequencies (MHz) RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
B1 5935.32 B1' 6187.36
B2 5945.20 B2' 6197.24
B3 5955.08 B3' 6207.12
B4 5964.97 B4' 6217.01
B5 5974.85 B5' 6226.89
B6 5984.73 B6' 6236.77
B7 5994.62 B7' 6246.66
B8 6004.50 B8' 6256.54
B9 6014.38 B9' 6266.42
B10 6024.27 B10' 6276.31
B11 6034.15 B11' 6286.19
B12 6044.03 B12' 6296.07
B13 6053.92 B13' 6305.96
B14 6063.80 B14' 6315.84
B15 6073.68 B15' 6325.72
B16 6083.57 B16' 6335.61
B17 6093.45 B17' 6345.49
B18 6103.33 B18' 6355.37
B19 6113.22 B19' 6365.26
B20 6123.10 B20' 6375.14
B21 6132.98 B21' 6385.02
B22 6142.87 B22' 6394.91
B23 6152.75 B23' 6404.79
B24 6162.63 B24' 6414.67

Channels B19/B19' to B24/B24' are set aside for narrow bandwidth systems and should be used only if all other channels are blocked. New MC systems in this band should use the lowest available frequency pair that can be successfully coordinated starting at channel B1/B1'.

4.3 Low-capacity (LC) Radio Frequency Channel Arrangements

The centre frequencies of the RF channel allocations for LC radio systems operating in the 5925-6425 MHz band are shown in Tables 3 to 5.

Table 3: Channel Identification and Carrier Frequencies for Radio Systems Using 5 MHz Wide Channels
GO (RETURN) Frequencies (MHz) RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
C1 6110.75 C1' 6362.79
C2 6115.69 C2' 6367.73
C3 6120.63 C3' 6372.67
C4 6125.57 C4' 6377.61
C5 6130.51 C5' 6382.55
C6 6135.45 C6' 6387.49
C7 6140.40 C7' 6392.44
C8 6145.34 C8' 6397.38
C9 6150.28 C9' 6402.32
C10 6155.22 C10' 6407.26
C11 6160.16 C11' 6412.20
C12 6165.10 C12' 6417.14

 

Table 4: Channel Identification and Carrier Frequencies for Radio Systems Using 3.75 MHz Wide Channels
GO (RETURN) Frequencies (MHz) RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
D1 6111.364 D1' 6363.404
D2 6116.305 D2' 6368.345
D3 6121.247 D3' 6373.287
D4 6126.189 D4' 6378.229
D5 6131.130 D5' 6383.170
D6 6136.072 D6' 6388.112
D7 6141.014 D7' 6393.054
D8 6145.955 D8' 6397.995
D9 6150.897 D9' 6402.937
D10 6155.839 D10' 6407.879
D11 6160.780 D11' 6412.820
D12 6165.722 D12' 6417.762

 

Table 5: Channel Identification and Carrier Frequencies for Radio Systems Using 2.5 MHz Wide Channels
GO (RETURN) Frequencies (MHz) RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
E1 6109.510 E1' 6361.550
E2 6111.981 E2' 6364.021
E3 6114.452 E3' 6366.492
E4 6116.923 E4' 6368.963
E5 6119.394 E5' 6371.434
E6 6121.865 E6' 6373.905
E7 6124.335 E7' 6376.375
E8 6126.806 E8' 6378.846
E9 6129.277 E9' 6381.317
E10 6131.748 E10' 6383.788
E11 6134.219 E11' 6386.259
E12 6136.690 E12' 6388.730
E13 6139.160 E13' 6391.200
E14 6141.631 E14' 6393.671
E15 6144.102 E15' 6396.142
E16 6146.573 E16' 6398.613
E17 6149.044 E17' 6401.084
E18 6151.515 E18' 6403.555
E19 6153.985 E19' 6406.025
E20 6156.456 E20' 6408.496
E21 6158.927 E21' 6410.967
E22 6161.398 E22' 6413.438
E23 6163.869 E23' 6415.909
E24 6166.340 E24' 6418.380
E25 6169.375 E25' 6421.250
E26 6171.875 E26' 6423.750

4.4 Branching or Spur Route Channels

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

4.5 Closed Loop

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

4.6 Spectral Efficiency

4.6.1 High and medium-capacity (HC and MC) systems submitted for licensing must have the capability of achieving a spectral efficiency of at least 4.4 bits/second/hertz of RF channel bandwidth on a single polarization. Existing systems meeting a spectral efficiency of 3 bits/second/hertz are grandfathered in accordance with paragraph 2.2.

4.6.2 Low-capacity (LC) systems must have the capability of achieving a spectral efficiency of at least 2.4 bits/second/hertz 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 diversity applications will be considered on a hop-by-hop basis to solve special propagation problems.

5. Transmitter Characteristics

5.1 The transmitter power delivered to the antenna input should not exceed the limits per RF channel shown in Table 6 below.

Table 6
Bandwidth (MHz) Power Limit
(watts) (dBW)
30 10 +10
10 7.5 +8.8
5 5 +7
3.75 3.5 +5.4
2.5 2 +3

5.2 An increase in transmitter power may be permitted if technical justification is provided. In no event will the power delivered to the antenna be permitted to exceed 20 W (+13 dBW) per RF channel.

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

5.4 Emission Limits

5.4.1 In any 4 kHz band, the centre frequency of which 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 log10 B (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)

Note:
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.

5.4.2 In any 1 MHz band, the centre frequency of which 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.

6. Antenna Characteristics

6.1 The co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within Envelope A defined in Table 7 and shown in Figure 1, for both vertical and horizontal polarizations.

6.2 In uncongested areas, the co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within Envelope B defined in Table 7 and shown in Figure 1, for both vertical and horizontal polarizations.

Table 7: Antenna Standards
Envelope Minimum Radiation Suppression to Angle in Degrees from Centreline of Main Beam (dB)
  0° to 1.1° 1.1° to 5° 5° to 10° 10° to 15° 15° to 20° 20° to 30° 30° to 100° 100° to 140° 140° to 180°
A 0 3 25 29 33 36 42 55 55
B 0 3 21 25 29 32 35 39 45

7. Maximum Equivalent Isotropically Radiated Power

The maximum equivalent isotropically radiated power (e.i.r.p.) from the antenna must not in any case exceed +55 dBW per RF channel.

8. Avoidance of the Geostationary-satellite Orbit

As far as practicable, sites for transmitting terrestrial stations operating in the fixed service, and employing maximum values of e.i.r.p. exceeding +35 dBW in the frequency band 5925-6425 MHz should be selected so that the direction of maximum radiation of the antenna will be pointed at least 2° away from the geostationary-satellite orbit, taking into account the effect of atmospheric refraction.

Where compliance with the above paragraph is impracticable the e.i.r.p. of the station shall not exceed:

  • +47 dBW in any direction within 0.5° of the geostationary-satellite orbit; or
  • +47 dBW to +55 dBW, on a linear decibel scale (8 dB per degree), in any direction between 0.5° and 1.5° of the geostationary-satellite orbit taking into account the effect of atmospheric refraction.
Figure 1: Minimum Antenna Characteristics - Frequency Band 5925-6425 MHz
Line graph illustrating the antenna radiation pattern limits from Table 7

Appendix 1 - Centre Frequencies of Existing Interstitial High-capacity Radio Systems Operating in the Band 5915-6425 MHz

Table 8: Channel Identification and Carrier Frequencies for Radio Systems Using 30 MHz Wide Interstitial Channels
GO (RETURN) Frequencies (MHz) Previous Channel
Designation (Reference)
RETURN (GO) Frequencies (MHz)
Channel Number Channel Centre Channel Number Channel Centre
1 5930.37 B1/B1' 1' 6182.41
2 5960.02 B2/B2' 2' 6212.06
3 5989.67 B3/B3' 3' 6241.71
4 6019.32 B4/B4' 4' 6271.36
5 6048.97 B5/B5' 5' 6301.01
6 6078.62 B6/B6' 6' 6330.66
7 6108.27 B7/B7' 7' 6360.31
8 6137.92 B8/B8' 8' 6389.96
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