LMCC "YG" TRUNKING SYSTEM PROPOSALS(1)
LIMITATIONS ON NUMBER OF CHANNELS IN APPLICATION LMCC recommends allowing a maximum of ten channels in a single YG application. However, a restriction on the number of channels in an application is meaningless without some requirement of action by the licensee prior to returning to the Commission for more channels. The LMCC therefore recommends that a licensee certify completion of construction and commencement of operation be provided prior to the processing of an application for additional centralized or decentralized trunked channels by the same party in interest. As a vehicle familiar to most licensees and minimally burdensome to the Commission, the LMCC recommends the filing of Form 800 letters for this purpose. LMCC Supplemental Comments to 2nd Report & Order, July, 1988, Para 17, 23 & 24 Notwithstanding the above, the LMCC proposal is not meant to include the
Public Safety Pool. LMCC Comments in the matter of 1998 Biennial Regulatory Review, WT
Docket No. 98-182, Para IIE LMCC is proposing a "protected" period of time to obtain required consents by electronically flagging, in the applicable databases, those frequencies which might be subject to "greenmail", in essence preserving the original applicant's interests in those frequencies. During this period of time, however, even though the first applicant is successful in gaining the necessary consents, subsequent application(s) for the target channels could be processed and filed with the Commission conditioned upon the subsequent applicant gaining the required consents to the proposed trunked system including those of the 1st applicant. At the end of the period, only those frequencies for which the trunked
station applicant had obtained the requisite consents would be included in the application
forwarded to the Commission, with consent forms attached as specified in the current
rules. Software flags would be removed from remaining channels, which would then become
available to other applicants. LMCC Supplemental Comments to 2nd Report & Order,
July, 1988, Details @ Para 20, 21 & 22 SERVICE AREA The recognized service area for a station in the 450-470 MHZ band is
considered to be its 39 dBu contour. Therefore, to adequately protect existing stations,
the LMCC recommends that applicants proposing centralized trunked systems be required to
obtain consent from existing co-channel and adjacent channel stations whose 39 dBu service
contour intersects the proposed station's 21 dBu interference contour. As an outside
limit, no base stations located more than 150 km (94 miles) from the proposed trunked
station need be considered for the consent process. LMCC Supplemental Comments to 2nd
Report & Order, July, 1988, Para 14 TRUNKING Licensees have begun to employ trunking systems where the monitoring for co-channel emissions is not performed by the mobile unit, but rather by a monitor employed at the repeater transmitter. LMCC believes that such systems should be licensed with an "IG" service code, and should not require co-channel consent. It is important that frequency coordinators and others be able to
determine the operational mode of the system. Therefore, LMCC suggests that the Commission
utilize a station class code addition in order to be able to designate on a single license
those frequencies that are monitored and those that are not monitored. LMCC proposes that any license which includes at least one non-monitored/centralized trunk channel should carry the "YB" radio service code and urges the Commission to adapt station class codes such as "FB2M"(2) ("M" for repeater- monitored). For example, an applicant seeking a five channel license would be issued a five channel "YG" license, designating four of the channels with an FB2M code and one channel with an FB2P (protected, non-monitored) code. In sum, LMCC is seeking to identify on a license three different frequency usage situations which would also be readily apparent in a frequency specific database search: (1) a frequency where the licensee employs a manual means of monitoring the channel prior to transmission or the mobile radio itself performs the channel selection (FB2), (2) a frequency where the licensee employs a monitor at the transmitter repeater which automatically locks out a channel when there is co-channel emissions (FB2M), and (3) a frequency where the licensee does not employ any form of monitoring because of prior co-channel consent or sufficient contour clearance. LMCC Comments in the matter of 1998 Biennial Regulatory Review, WT Docket No. 98-182, Para IIC 2. The station example being utilized here assumes
a private, internal use system. If the station is a community repeater, the station class
would be FB4M or FB4P, as the case may be. A private carrier would be FB6M or FB6P and a
non-profit cooperative would be FB7M or FB7P. YG APPLICATIONS LMCC proposes that all "YG" applications include either 1. an analysis showing that the interference contour (21 dBu) of the proposed station does not overlap the service contour (39 dBu) of any existing co-channel or adjacent channel station, or 2. letters of consent from all such overlapping station licensees. The LMCC does not recommend a change in the degree of adjacency in which consent is required, based on the bandwidth of the proposed trunked system. LMCC Supplemental Comments to 2nd Report & Order, July, 1988, Details @ Para 15 &16 1. The sources of these proposals are listed in an appendix below. ************************************************************************************ SOURCE APPENDIX The proposals contained in this compilation are from the following sources: 1.) LMCC COMMENTS IN THE MATTER OF 1998 BIENNIAL REGULATORY REVIEW - C.F.R. PART 90-PRIVATE LAND MOBILE RADIO SERVICES, et al. WT DOCKET NO. 98-182 2.) LMCC SUPPLEMENTAL COMMENTS TO 2ND REPORT & ORDER, JULY, 1988 ><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> LMCC LOW POWER/HIGH POWER PROPOSALS(3) 6.25 kHz OFFSET UHF CHANNELS LMCC recommends that the 6.25 kHz channels immediately above and below those 12.5 kHz channels listed in Appendices A, B, C, and D receive the same low power designations as the associated 12.5 kHz channels. LMCC Plan, 6/4/97, Details @ 5 ALARM CHANNEL POWER LIMITS (CENTRAL STATION) LMCC recommends maintaining the 2 watt power limit on the five channel pairs (Appendix C) designated for central station alarm use. LMCC Plan, 6/4/97, Detail @ 3 CERTIFICATION/ACKNOWLEDGMENTS It is recommended that all frequency advisory committees require that high-power offset applicants sign a statement declaring that they acknowledge that their operations are secondary to incumbent low-power offset licensees, including medical telemetry users, until the Commission closes the seven-month transition window. The statement should also make it clear that the applicant will be operating the system on a non-interference basis and that if the system causes interference to incumbent low-power systems, the applicant is required to take what ever steps necessary to remedy the interference including the cessation of operations. High-power applicants should also be notified that they may receive interference from unlicensed operation for which their frequency coordinating committee is not responsible, other than to potentially assist in the resolution of the interference matter. This executed statement should be submitted to the Commission as part of the application package so that it becomes a part of the permanent licensing record. The FCC's Licensing Division in Gettysburg has informed the LMCC that all applications for high-power use on offset channels must be accompanied by a statement from frequency advisory committees specifically certifying that the committee has made the appropriate determination that the proposed operation will not cause interference to incumbent operations. The routine committee certification stamp is NOT sufficient for this purpose. LMCC Guidelines for the Frequency Coordination and Certification of High Power Systems on UHF Offset Channels within the Industrial/Business Pool CONSTRUCTION DEADLINES LMCC supports the Commission's proposal to standardize the construction period of Part 90 licensees at one (1) year. LMCC Comments in the matter of 1998 Biennial Regulatory Review, WT Docket No. 98-182, Para IIB CONTOUR PREDICTION MODELS At a minimum, R-6602 contour studies are to be employed to determine potential interference levels. Frequency advisory committees may employ other models such as Longley-Rice and TechNote 101. LMCC Guidelines for the Frequency Coordination and Certification of High Power Systems on UHF Offset Channels within the Industrial/Business Pool DOCKSIDE/CARGO (Limitation # 60 frequencies) LMCC will not oppose use of these frequencies for non-dockside applications on a secondary, low power basis if coordinated and location licenced. LMCC Comments in the matter of 1998 Biennial Regulatory Review, WT Docket No. 98-182, Para IIA EXISTING SECONDARY LICENSEES Under these LMCC recommendations, those entities licensed on a secondary basis on the 12.5 kHz offset frequencies would have several options: LMCC Plan, 6/4/97, Details @ 6
LMCC recommends 50 channel pairs in the 450-470 MHZ band (See Appendix A) be set aside for LOW POWER COORDINATED use, subject to the following conditions:
Outside of the 80 km radius, the 40 latter channel pairs may be assigned full power status subject to proposed coordination procedures using contour analysis. LMCC Plan, 6/4/97, Details @ 1 LOW POWER COORDINATED, NON-VOICE LMCC recommends 10 channel pairs in the 450-470 MHZ band (see Appendix B) be set aside for LOW POWER COORDINATED, NON-VOICE use, subject to the following conditions:
These channels are designated for remote control of medical devices, robotics, cranes, etc. LMCC Plan, 6/4/97, Details @ 2
LOW POWER ITINERANT NON-COORDINATED LMCC recommends 25 channel pairs in the 450-470 band (See Appendix D) for low power, non-coordinated itinerant use nationwide.
New type acceptance grants for transmitters on these channels would specify that units must be capable of operation only on these 25 low power uncoordinated channels and on other UHF "dot/star" channels (464.5/469.5, 464.55/469.55, 467.85, 467.875, 467.9 and 467.925 MHZ already used for similar low power and/or itinerant operations. LMCC Plan, 6/4/97, Details @ 4
MOBILE-ONLY SYSTEMS It's difficult to conduct a contour analysis for mobile-only systems. Certain frequency advisory committees may elect not to certify applications seeking high-power systems on offset channels. Regardless, six feet is to be used as the designated antenna height for mobile-only systems. In a related matter, a number of frequency advisory committees have received and are processing applications for private carrier (MO6) systems. As a matter of prudent spectrum management, the LMCC Refarming Initiatives Task Force recommends that applications for low-power MO6 systems be assigned only on those offset channels that have been included within the 25 channel uncoordinated pool, as designated by the LMCC in its Low Power Pool proposal that was submitted to the Commission. Applicants for high-power MO6 systems may be directed to other channels. Further, the Task Force recommends against the coordination of wide-area, i.e., statewide, etc., MO6 systems, as such certifications are not deemed prudent spectrum management. LMCC Guidelines for the Frequency Coordination and Certification of High Power Systems on UHF Offset Channels within the Industrial/Business Pool
NON-COORDINATED LOW POWER ITINERANT LMCC recommends 25 channel pairs in the 450-470 band (See Appendix D) for low power, non-coordinated itinerant use nationwide.
New type acceptance grants for transmitters on these channels would specify that units must be capable of operation only on these 25 low power uncoordinated channels and on other UHF "dot/star" channels (464.5/469.5, 464.55/469.55, 467.85, 467.875, 467.9 and 467.925 MHZ already used for similar low power and/or itinerant operations. LMCC Plan, 6/4/97, Details @ 4
POWER LIMITS, CENTRAL STATION ALARM LMCC recommends maintaining the 2 watt power limit on the five channel pairs (Appendix C) designated for central station alarm use. LMCC Plan, 6/4/97, Details @ 3
PROTECTION CRITERIA A DHAAT calculation is to be determined for the proposed as well as for any licensed or pending co-channel and adjacent channel system(s) that are identified following the appropriate geographic search that may require a protection analysis.
1. CO-CHANNEL SYSTEMS Incumbent systems are to be protected such that the 21 dBu F(50,10) interference contour of the proposed system does not overlap the 39 dBu F(50,50) service contour of any existing stations.
2. ADJACENT CHANNEL SYSTEMS Existing adjacent channel operations are to be taken into consideration in a similar manner, and to allow for the difference between co-channel and adjacent channel use, a derating factor is to be employed utilizing one of the following two methods: A. Incumbent systems are to be protected so that the 21 dBu F(50,10) interference contour of the proposed station does not overlap the 39 dBu F (50,50) service contour of the existing station(s); however a 19.5 dB derating is to be used when calculating the interference contour, or B. Incumbent systems are to be protected so that the 40.5 dBu F(50,10) interference contour of the proposed station does not overlap the 39 dBu F(50,50) service contour of the existing station(s). This change in the interference contour takes into account the reduced area in which the proposed station could interfere, based upon its offset channel position. The 40.5 dBu contour is equivalent to the 19.5 derating , thus avoiding having to conduct an extra calculation. LMCC Guidelines for the Frequency Coordination and Certification of High Power Systems on UHF Offset Channels within the Industrial/Business Pool
LMCC (based on PSCC input) recommends 14 - 12.5 kHz channel pairs in the 450-470 MHZ band (See Appendix E) be set aside for low power coordinated use nationwide by Public Safety.
LMCC further recommends that existing licensees on public safety low power secondary systems consider a transition to one of the designated low power channels as soon as possible because the remaining 12.5 (offset) channel pairs in the public safety pool are now available for licensing of full power stations. LMCC Plan, 6/4/97, Details @ II
SEARCH RADIUS High Power, Offset Channel Query the database to a sufficiently large area to determine all potential co-channel and adjacent channel interference possibilities, typically 70-100 miles. Reduced search areas may be performed when a "high power" licensee is seeking a reduced power such as 5 - 10 watts. LMCC Guidelines for the Frequency Coordination and Certification of High Power Systems on UHF Offset Channels within the Industrial/Business Pool
SECONDARY LICENSEES, EXISTING Under these LMCC recommendations, those entities licensed on a secondary basis on the 12.5 kHz offset frequencies would have several options: LMCC Plan, 6/4/97, Details @ 6
STATION RECORDS LMCC recommends that the Commission clarify Sections 90.439, 90.443 and 90.447 to specify that mobile transmitter measurements may be kept at: (1) the licensee's "home office", (2) the licensee's "local office" or (3) the licensee's radio maintenance provider. LMCC Comments in the matter of 1998 Biennial Regulatory Review, WT Docket No. 98-182, Para IIF 3. The sources of these proposals are listed in an
appendix on the last page of this section. ************************************************************************************ Industrial/Business 50 Channel, Coordinated, Low Power Pool
* Indicates frequency pairs that are available nationwide. In addition to the channels listed above, the same low power designations apply to the channels 6.25 kHz immediately above and below these channels. ******************************************************************************** Industrial/Business 10 Channel, Non-Voice, Coordinated Low Power Pool
In addition to the channels listed above, the same low power designations apply to the channels 6.25 kHz immediately above and below these channels. ******************************************************************************** Industrial/Business 5 Channel, Central Station Alarm, Low Power Pool
In addition to the channels listed above, the same low power designations apply to the channels 6.25 kHz immediately above and below these channels. *******************************************************************************
In addition to the channels listed above, the same low power designations apply to the channels 6.25 kHz immediately above and below these channels. ******************************************************************************** Public Safety 14 Channel, Coordinated, Low Power Pool
In addition to the channels listed above, the same low
power designations apply to the channels 6.25 kHz immediately above and below these
channels. SOURCE APPENDIX The proposals contained in this section are from the following sources: 1.) LMCC COMMENTS IN THE MATTER OF 1998 BIENNIAL REGULATORY REVIEW, WT DOCKET NO. 98-182 2.) LMCC PLAN, 6/4/97 3.) LMCC GUIDELINES FOR THE FREQUENCY COORDINATION AND CERTIFICATION OF HIGH POWER SYSTEMS ON UHF OFFSET CHANNELS WITHIN THE INDUSTRIAL/BUSINESS POOL |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||