SRSP-321.8 — Technical Requirements for the Fixed Line-of-Sight Radio Systems Operating in the Bands 21.8-22.4 GHz and 23.0-23.6 GHz

SRSP-321.8 - Technical Requirements for the Fixed Line-of-Sight Radio Systems Operating in the Bands 21.8-22.4 GHz and 23.0-23.6 GHz
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Provisional
Issue 1
July 19, 1997

Spectrum Management
Standard Radio System Plan

1. Intent

1.1 This Standard Radio System Plan (SRSP) states the minimum technical requirements for the efficient use of the frequency bands 21.8-22.4 GHz and 23.0-23.6 GHz for low capacity (LC), medium capacity (MC) and high capacity (HC) digital line-of-sight radio systems in the fixed service.

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 (RSP) 113, Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service.

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-321.2, Issue 1. Revision of this SRSP will be made as required.

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

2.3 The arrangements for non-standard systems are outlined in SP-GEN, General Information Related to Spectrum Utilization and Radio Systems Policies.

2.4 The Geographical Differences Policy (GDP) guideline applies in this frequency band. Existing and new fixed systems in uncongested areas, as defined by the GDP, may operate as standard provided they meet the SP and SRSP or have received approval from Industry Canada regarding exemption from certain SP and/or SRSP provisions. In areas of normal congestion, standard systems are expected to comply with the SP and SRSP. In areas designated as moderately congested, existing systems will be considered as standard if they meet the provisions of the SP and SRSP; new systems will also be expected to meet the enhanced provisions of the SP and SRSP (see section 8). In highly congested areas all new systems and those originally licensed for more than fifteen years must comply with the provisions and enhanced provisions of the SP and SRSP. More information on the GDP can be found in SP 1-20 GHz.Footnote 1

2.5 Although a radio system conforms with the requirements of this SRSP, modifications may be required to the system whenever harmful interferenceFootnote 2 is caused to other radiostations or systems.

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

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

2.8 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.

2.9 It should be noted that the fixed terrestrial service shares this band with other services in accordance with the Canadian Table of Frequency Allocations.

2.10 Analogue radio systems used for fixed video applications are permitted as standard on a limited basis as described in section 4.4. However, applicants are encouraged to implement digital systems wherever practicable.

3. Related Documents

3.1 The current issues of the following documents are applicable:

3.1.1 Spectrum Utilization Policy GEN (SP-GEN)Footnote 3 - General Information Related to Spectrum Utilization and Radio System Policies.

3.1.2 Spectrum Utilization Policy (SP) 1-20 GHzFootnote 3 - Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz.

3.1.3 Radio Standards Procedure (RSP) 113 - Application Procedures for Planned Radio Stations Above 960 MHz in the Fixed Service.

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

3.1.5 Canadian Table of Frequency Allocations, available from the Canadian Government Publishing Centre, Government Services, Ottawa, Ontario, K1A 0S5 Canada.

3.2 Except as noted, the above documents are available on request from the offices of Industry Canada in Ottawa, Vancouver, Winnipeg, Toronto, Montreal or Moncton.

4. Radio Frequency Channel Arrangements

4.1 The radio frequency channel arrangements defined in this Standard provide for 8 different RF channel bandwidths. Channel pairs are provided with a common transmit/receive separation of 1.2 GHz.

Available channel bandwidths:

  1. RF channel bandwidths of greater than 40.0 MHz and less than or equal to 50.0 MHz. These correspond to channels A1/A'1 to A12/A'12.
  2. RF channel bandwidths of greater than 20.0 MHz and less than or equal to 40.0 MHz. These correspond to channels B1/B'1 to B15/B'15.
  3. RF channel bandwidths of greater than 15.0 MHz and less than or equal to 20.0 MHz. These correspond to channels C /C'1 to C30/C'30.
  4. RF channel bandwidths of greater than 10.0 MHz and less than or equal to 15.0 MHz. These correspond to channels D1/D'1 to D40/D'40.
  5. RF channel bandwidths of greater than 7.5 MHz and less than or equal to 10.0 MHz. These correspond to channels E1/E'1 to E60/E'60.
  6. RF channel bandwidths of greater than 5.0 MHz and less than or equal to 7.5 MHz. These correspond to channels F1/F'1 to F80/F'80.
  7. RF channel bandwidths of greater than 2.5 MHz and less than or equal to 5.0 MHz. These correspond to channels G1/G'1 to G120/G'120.
  8. RF channel bandwidths of less than or equal to 2.5 MHz. These correspond to channels H1/H'1to H240 /H'240.

4.2 Radio Frequency Channel Centre Frequencies

4.2.1 The centre frequencies of the 12 paired channels which allow RF channel bandwidths of 50 MHz are expressed by the following relationships:

Lower half of the band An = 21775 + 50n for n = 1 to 12
Upper half of the band A'n = 22975 + 50n for n = 1 to 12

where n is the channel number and An and A'n are the centre frequencies in MHz of the paired channels.

4.2.2 The centre frequencies of the 15 paired channels which allow RF channel bandwidths of 40 MHz are expressed by the following relationships:

Lower half of the band Bn = 21780 + 40n for n = 1 to 15
Upper half of the band B'n = 22980 + 40n for n = 1 to 15

where n is the channel number and Bn and B'n are the centre frequencies in MHz of the paired channels.

4.2.3 The centre frequencies of the 30 paired channels which allow RF channel bandwidths of 20 MHz are expressed by the following relationships:

Lower half of the band Cn = 22410 - 20n for n = 1 to 30
Upper half of the band C'n = 23610 - 20n for n = 1 to 30

where n is the channel number and Cn and C'n are the centre frequencies in MHz of the paired channels.

4.2.4 The centre frequencies of the 40 paired channels which allow RF channel bandwidths of 15 MHz are expressed by the following relationships:

Lower half of the band Dn = 22407.5 - 15n for n = 1 to 40
Upper half of the band D'n = 23607.5 - 15n for n = 1 to 40

where n is the channel number and Dn and D'n are the centre frequencies in MHz of the paired channels.

4.2.5 The centre frequencies of the 60 paired channels which allow RF channel bandwidths of 10 MHz are expressed by the following relationships:

Lower half of the band En = 22405 - 10n for n = 1 to 60
Upper half of the band E'n = 23605 - 10n for n = 1 to 60

where n is the channel number and En and E'n are the centre frequencies in MHz of the paired channels.

4.2.6 The centre frequencies of the 80 paired channels which allow RF channel bandwidths of 7.5 MHz are expressed by the following relationships:

Lower half of the band Fn = 22403.75 - 7.5n for n = 1 to 80
Upper half of the band F'n = 23603.75 - 7.5n for n = 1 to 80

where n is the channel number and Fn and F'n are the centre frequencies in MHz of the paired channels.

4.2.7 The centre frequencies of the 120 paired channels which allow RF channel bandwidths of 5 MHz are expressed by the following relationships:

Lower half of the band Gn = 22402.5 - 5n for n = 1 to 120
Upper half of the band G'n = 23602.5 - 5n for n = 1 to 120

where n is the channel number and Gn and G'n are the centre frequencies in MHz of the paired channels.

4.2.8 The centre frequencies of the 240 paired channels which allow RF channel bandwidths of 2.5 MHz are expressed by the following relationships:

Lower half of the band Hn = 22401.25 - 2.5n for n = 1 to 240
Upper half of the band H'n = 23601.25 - 2.5n for n = 1 to 240

where n is the channel number and Hn and H'n are the centre frequencies in MHz of the paired channels.

4.3 Closed Loops

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

4.4 Assignment of Frequencies

New systems using any of the 50 MHz or 40 MHz channel plans should use the lowest available frequency pair that can be successfully coordinated.

New systems using any of the 20 MHz, 15 MHz, or 10 MHz channel plans should use the highest available frequency pair starting from 22.3 GHz and 23.5 GHz that can be successfully coordinated. Access to a maximum of five 20 MHz paired channels, preferably contiguous, would also be available for one-way or two-way video applications. These channels will be identified by the Regional Director. Analogue systems requiring larger channel bandwidths up to 40 MHz will be considered on a case-by-case basis within the spectrum designated for the 20 MHz analogue systems.

Figure 1: 21.8-22.4 GHz and 23.0-23.6 GHz growth plan.
Figure 1: 21.8-22.4 GHz and 23.0-23.6 GHz growth plan

[Description of figure]

New systems using any of the 7.5 MHz, 5.0 MHz, or 2.5 MHz channel plans should use the highest available frequency pair that can be successfully coordinated. Systems with bandwidth greater than 7.5 MHz may employ on a case-by-case basis frequency assignment in the sub-bands 22.3-22.4/23.5-23.6 GHz only if all other channels are unavailable.

4.5 Spectral Efficiency

Low and medium capacity digital systems submitted for licensing shall have a minimum spectral efficiency of 0.8 bit/s/Hz of the RF channel bandwidth on a single polarization.

Notwithstanding the above paragraph, systems utilizing the 2.5 MHz channels with a bit rate of 1.544 Mbit/s (or less on a case-by-case basis) will be licensed as standard.

5. Transmitter Characteristics

5.1 The transmitter power delivered to the antenna input shall not exceed 10 Watts (+10 dBW) per RF channel.

5.2 The centre frequency of the emission shall be maintained within ±0.003% of the assigned frequency with the exception of the 2.5 MHz channels where it should be maintained within ±0.001%. An exemption to the requirement of 0.003% stability may be granted for analogue systems requiring larger channel bandwidths (up to 40 MHz) approved under Section 4.4, on a case-by-case basis.

5.3 All significant emissions from the transmitter shall be contained within the licensed bandwidth.

6. Antenna Characteristics

The co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within the envelope B shown in Figure 2 for both vertical and horizontal polarizations.

7. Maximum Equivalent Isotropically Radiated Power (EIRP)

The maximum EIRP from the antenna must not exceed +55 dBW per RF channel.

8. Enhanced Technical Requirements for Moderately Congested and Highly Congested Areas

The co-polarized radiation pattern envelope in the horizontal plane of the antenna must remain within envelope A shown in Figure 2 for both vertical and horizontal polarizations.

Issued under the authority of the Minister of Industry Canada

R.W. McCaughern
Acting Director General
S pectrum Engineering Branch

Figure 2 - Minimum antenna characteristics - Frequency Band 21.9-22.4 and 23.0-23.6 GHz
Figure 2 - Minimum antenna characteristics - Frequency Band 21.9-22.4 and 23.0-23.6 GHz

[Description of figure]

Footnotes

Return to footnote reference 1 Revisions to Microwave Spectrum Utilization Policies in the Range of 1-20 GHz (SP 1-20 GHz) January 1995, contains new spectrum utilization principles including the Geographical Differences Policy guideline. This information will be incorporated into a revision of SP-GEN.

Return to footnote reference 2 For the purpose of this SRSP, harmful interference means interference which 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.

Return to footnote reference 3 SP 1-20 GHz contains revisions to SP 20.2, as well as revisions and new spectrum utilization principles to be included in SP-GEN. SP 1-20 GHz should also be referenced until a future consolidation of these policy documents is implemented by Industry Canada.


Image Descriptions

Figure 1: 21.8-22.4 GHz and 23.0-23.6 GHz growth plan

Figure1 Illustrates the growth plans, which indicate the order in which channels of various sizes will normally be assigned. These growth plans are also described in Section 4.4.
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Figure 2 - Minimum antenna characteristics - Frequency Band 21.9-22.4 and 23.0-23.6 GHz

Figure 2 is a line graph that 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 -80 to 0. The x-axis plots azimuth in degrees from main lobe from 0 to 180.

There are two data lines. The first line, Envelope B applies normally while the enhanced requirements of Envelope A, the second line, apply for systems in moderately congested and highly congested areas. The Envelope B line ranges from -36 to 0 on the y-axis. Data points for Envelope B include: 0 dB from 0 to 2 degrees, -17 dB at 5 degrees, -27 dB at 20 degrees, -32 at 40 degrees, -35 dB from 60 to 80 degrees, -36 dB from 100 to 180 degrees The Envelope A line ranges from -60 to 0 on the y-axis. Data points for Envelope A include: 0 dB from 0 to 1.5 degrees, -13 dB at 2 degrees, -21 dB at 5 degrees, -33 at 20 degrees, -42 dB from 40 to 100 degrees, -60 dB from 120 to 180 degrees. Measured radiation pattern in the horizontal plane must be within these limits for vertical or horizontal polarizations.
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