AMCP WORKING GROUP B WP3 JANUARY 2001 SAN DIEGO

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Global signalling channel for VDL Mode 4

AMCP Working Group B WP3


January 2001

San Diego, California

United States



Global signalling channels for VDL Mode 4

(Presented by the Secretariat)



1. Introduction


1.1. At AMCP/7, the need for two global signaling channels for VDL Mode 4 was discussed. It was noted that there would be a need for a decision to be coordinated within ICAO on the assignment of these frequencies. A timely availability of these channels would facilitate the introduction of VDL. Although a global availability of these channels would be preferable it was recognized that, given the current congestion in the VHF bands, regional solutions might need to be considered as well.


1.2. AMCP/7 further agreed that the required activities towards the identification of these channels would need to be included in the future work program of the panel and identified Working Group B with the task to identify the availability of spectrum for global signaling channels for VDL Mode 4.



2. In December 2000, AMCP Working Group M reviewed the requirement for the global signaling channels for VDL Mode 4. These channels are mainly required for the transmission of ADS-B data. The secretary was requested to inform WG B on the requirements for these channels.



3. Concerning the requirements for VDL Mode 4 signaling channels, WG B was informed that these channels would require a significant frequency separation in order to improve the availability of the R/F channel. It is therefore requested that WG B in particular would consider the identification of one signaling channel at the upper end of the band 1117.975 - 137 MHz and another channel the lower end of the same band or the upper end of the band 108 - 117.975 MHz. The latter would satisfy requirements to accommodate ADS-B applications in a navigation band. Possible candidate frequencies could be one of the frequencies 136.9 MHz, 136.925 MHz or 136.95 MHz. The other frequency could possibly be 117.975 or 117.950 although the potential interference from VDL Mode 4 into VOR receivers need to be carefully assessed before such an assignment could be made. Another option would be to (re-) consider to reduce the guard-band around 121.5 MHz and to identify a channel from this band for VDL signaling.


4. WG B is requested in this further work on this matter to take the above into consideration and to liaise back to WG B any request for more information and/or the results of the relevant studies.





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