SRSP-303.7 — Technical Requirements for Fixed Line-of-Sight Radio Systems Operating in the Band 3700-4200 MHz

Issue 3
December 2006

Preface

Issue 3 of SRSP‑303.7 has been released to incorporate refinements to the minimum antenna characteristics and emission limits. This SRSP replaces SRSP‑303.7, Issue 2.

Issued under the authority of
the Minister of Industry

space to insert signature

R.W. McCaughern
Director General
Spectrum Engineering Branch

 

Contents

  1. Intent
  2. General
  3. Related Documents
  4. Radio Frequency Channel Arrangement Description
  5. Transmitter Characteristics
  6. Antenna Characteristics
  7. Maximum Equivalent Isotropically Radiated Power
  8. Avoidance of the Geostationary‑satellite Orbit
  9. Appendix 1 — Centre Frequencies of Existing Radio Systems Operating in the Band 3500‑4200 MHz

1. Intent

1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the band 3700‑4200 MHz by high‑capacity (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 technical evaluation of 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‑303.7, Issue 2. Further revision of this SRSP will be made as required.

2.2 Existing point‑to‑point radio systems operating in the band 3700‑4200 MHz and licensed as standard prior to the issuance of this SRSP may continue to operate as standardFootnote 1. Extension and/or expansion of these systems will be considered by the Department on a case‑by‑case basis. 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 SP Gen, General Information Related to Spectrum Utilization and Radio Systems Policies.

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 GHzFootnote 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 service (space‑to‑Earth).


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

 

SP 3400‑3700 MHz

 

SP 1‑20 GHz

 

 

SP Gen

 

RSP‑113

 

TRC‑43

 

CPC‑2‑0‑03

dividing line

CPC — Client Procedures Circular
RSP — Radio Standards Procedure
SP — Spectrum Utilization Policy
TRC —  ;Telecommunications Regulation Circular


4. Radio Frequency Channel Arrangement Description

4.1 Radio Frequency Channel Arrangements

The radio frequency channel arrangements defined in this Standard provide for 20 MHz, 30 MHz and 40 MHz RF channel bandwidths.

4.2 Radio Frequency Channel Centre Frequencies

In order to minimize intermodulation effects, each set of RF channel bandwidths will operate with its own transmit/receive separation.

4.2.1 The centre frequencies of the channel allocations for radio systems using 20 MHz channels with transmit/receive separations of 250 MHz are shown in Table 1.

4.2.2 The centre frequencies of the channel allocations for radio systems using 30 MHz channels with transmit/receive separations of 255 MHz are shown in Table 2.

4.2.3 The centre frequencies of the alternate channel allocations for radio systems using 40 MHz channels with transmit/receive separations of 260 MHz are shown in Table 3.

4.3 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.

4.4 Closed Loops

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

Table 1 — Channel Identification and Carrier Frequencies for Radio Systems Using 20 MHz Wide Channels
GO (RETURN) Frequencies
(MHz)
RETURN (GO) Frequencies
(MHz)
Channel Number Channel Centre Channel Number Channel Centre
A1 3710 A1' 3960
A2 3730 A2' 3980
A3 3750 A3' 4000
A4 3770 A4' 4020
A5 3790 A5' 4040
A6 3810 A6' 4060
A7 3830 A7' 4080
A8 3850 A8' 4100
A9 3870 A9' 4120
A10 3890 A10' 4140
A11 3910 A11' 4160
A12 3930 A12' 4180

 

Table 2 — 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
B1 3715 B1' 3970
B2 3745 B2' 4000
B3 3775 B3' 4030
B4 3805 B4' 4060
B5 3835 B5' 4090
B6 3865 B6' 4120
B7 3895 B7' 4150
B8 3925 B8' 4180

 

Table 3 — Channel Identification and Carrier Frequencies for Radio Systems Using 40 MHz Wide Channels
GO (RETURN) Frequencies
(MHz)
RETURN (GO) Frequencies
(MHz)
Channel Number Channel Centre Channel Number Channel Centre
Note: Airborne radio altimeters in the aeronautical radionavigation service operating on frequencies just above the band edge at 4200 MHz may cause sporadic adjacent channel interference to radio systems operating on 4180 MHz.
C1 3720 C1' 3980
C2 3760 C2' 4020
C3 3800 C3' 4060
C4 3840 C4' 4100
C5 3880 C5' 4140
C6 3920 C6' 4180

4.5 Growth Patterns

Assignments in this band should use the lowest available frequency pair that can be successfully coordinated.

4.6 Spectral Efficiency

Systems submitted for licensing must have the capability of achieving a spectral efficiency of at least 4.4 bits/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 diversity applications will be considered on a case‑by‑case basis to solve special propagation problems.


5. Transmitter Characteristics

5.1 The transmitter power delivered to the antenna input should not exceed 10 watts per RF channel.

5.2 An increase in transmitter power over the above‑specified limits may be permitted if technical justification is provided. In no event shall the power delivered to the antenna be permitted to exceed 20 watts (+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 4 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 4 and shown in Figure 1, for both vertical and horizontal polarizations.

Table 4 — Antenna Standards
Envelope Minimum Radiation Suppression to Angle in Degrees from Centreline of Main Beam (dB)
 
to
1.35°
1.35°
to

to
10°
10°
to
15°
15°
to
20°
20°
to
30°
30°
to
100°
100°
to
140°
140°
to
180°
A 0 3 23 29 33 36 42 55 55
B 0 3 20 24 28 32 32 32 32

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 guidance, to protect against geostationary‑satellite space station emissions, new fixed service station receive antennas in the band 3700‑4200 MHz should avoid pointing towards the geostationary‑satellite orbit, taking into account the effect of atmospheric refraction.Footnote 4


Figure 1 — Minimum Antenna Characteristics Frequency Band 3700‑4200 MHz

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text Table 4


Appendix 1 — Centre Frequencies of Existing Radio Systems Operating in the Band 3500‑4200 MHz


Table 5 — Channel Identification and Carrier Frequencies for Radio Systems Using 20 MHz Wide Channels
GO (RETURN) Frequencies
(MHz)
Previous Channel Designation (Reference) RETURN (GO) Frequencies
(MHz)
Channel Number Channel Centre Channel Number Channel Centre
1 3550 007L/007H 1' 3590
2 3610 001H/001L 2' 3570
3 3630 07L/07H 3' 3670
4 3690 01H/01L 4' 3650
5 3710 7L/7H 5' 3750
6 3770 1H/1L 6' 3730
7 3790 8L/8H 7' 3830
8 3850 2H/2L 8' 3810
9 3870 9L/9H 9' 3910
10 3930 3L/3H 10' 3890
11 3950 10L/10H 11' 3990
12 4010 4H/4L 12' 3970
13 4030 11L/11H 13' 4070
14 4090 5H/5L 14' 4050
15 4110 12L/12H 15' 4150
16 4170 6H/6L 16' 4130

 

Table 6 — Channel Identification and Carrier Frequencies for Radio Systems Using 40 MHz Wide Channels
GO (RETURN) Frequencies
(MHz)
RETURN (GO) Frequencies
(MHz)
Channel Number Channel Centre Channel Number Channel Centre
1 3540 1' 3580
2 3620 2' 3660
3 3700 3' 3740
4 3780 4' 3820
5 3860 5' 3900
6 3940 6' 3980
7 4020 7' 4060
8 4100 8' 4140

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