e-NAV4 / 06 / 08




RTCM Annual AssemblyFrom: Oltmann, Jan-Hendrik [JOltmann@wsd-nord.de]
Sent: 18 February 2008 14:12
To: William.R.Cairns@uscg.mil; Dr. Nick Ward; Vice-Chair e-Navigation Committee; Mahesh Alimchandani
Cc: Ross Norsworthy; nlb.org.uk, peterd; WimvanderHeijden.SMC@gmail.com; nautinst.org, djp
Subject: WG: RTCM Annual Assembly

Attachments: R07-WP5B-080206-TD-0022!R1!MSW-E.zip; R07-WP5B-080206-TD-0023!!MSW-E.doc

Dear Bill, dear Nick, dear Mahesh,

I hereby wish to submit the email conversation between Mr. Ross Norsworthy (US; Chair RTCM SC123) and myself together with the two ITU-R WP5B preliminary draft new recommendations/reports as LATE INPUT to the eNAV4 meeting, with expressive consent of Mr. Norsworthy. 

They are highly relevant for the envisaged COMMS working group and are also hot off the press. They show, that there is already something big on the move at ITU and RTCM regarding future broad band VHF Communication means ship/shore - shore/ship. I think, the eNAV Committee should be made aware of this.

Since the IALA web site is closed right now for input documents, it would be OK from my point of view to distribute these documents at the beginning of the meeting by electronic means. This may be justifyable since the documents were generated only last week by another organisation.

Thank you!
Best regards,

Jan-Hendrik Oltmann



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Von: Ross Norsworthy [mailto:Ross_Norsworthy@msn.com] 
Gesendet: Donnerstag, 14. Februar 2008 15:27
An: Oltmann, Jan-Hendrik
Betreff: Re: RTCM Annual Assembly


Hi Jan-Hendrik,

For your information, the RTCM SC123 paper site is: http://rtcm.info/sc123/ This contains all the papers of the committee. The main focus of the work is to establish a data transfer means between stations for small messages. However, the work will also include the wideband shore-based service that we discussed last month. Also, FYI, the ITU-R WP5B here in Geneva has now approved my input paper for revision of Recommendation ITU-R M.1842 to add Annex 3 for the wideband service (see attached temporary document that will become an official revision). Unfortunately, since there was no IALA representation here at this ITU-R WP5B meeting, there was nobody to say that there was a need for data rates beyond the capabilities of the current Telenor system (see also attached temporary document that we included as a report for the record) that provides 133 kbps (using nine contiguous 25 kHz channels, and not EMC-compatible with Appendix 18). Therefore, the proposal was to find a way to provide at least this data rate within the requirements of the Recommendation ITU-R M.1842 which includes EMC-compatibility with Appendix 18 and using as few contiguous 25 kHz channels as possible for maximum spectrum-efficiency. Therefore, we could only justify this 153.6 kbps data rate using two contiguous 25 kHz channels. I sincerely hope that this is OK with our colleagues in IALA. I believe that IALA should consider this limitation of Appendix 18 to not be a super-wideband gateway for extensive file transfers, etc. on 25 kHz VHF channels in Appendix 18. It is a priority to send data between stations, not to establish an internet gateway on VHF, in my opinion.

Best Regards,
Ross


 
  ----- Original Message ----- 
  From: Oltmann, Jan-Hendrik 
  To: ross_norsworthy@msn.com 
  Sent: Thursday, February 14, 2008 8:05 AM
  Subject: RTCM Annual Assembly


  Dear Ross, 

  when looking at the present programme of the RTCM Annual Meeting in May on the RTCM Home Page, I also found your SC123 meeting on the last day scheduled.

  The title "VHF-FM Digital Small Message Services" - to be honest - doesn't sound too much like the "big new digital all-sing-and-dance-machine for maritime communications", which is under consideration at ITU WP and which the AIS TWG of the eNAV Committee discussed in Sarasota in January.

  Hence: 
  * Can you provide me with some more (background) information on what you plan to do during that day, preferably in within the larger context of the emerging e-Navigation COMMS framework?

  * Do you have a Terms-of-Reference document for SC 123? 

  Unfortunately, the other SC 121, which is also of larger interest to AIS/eNAV folks like myself, "Expanded Use of AIS in VTS" is scheduled in parallel to your group meeting. Is there margin to re-schedule either group to another day, e.g. Wednesday of that week (preferably), i.e. parallel to some Technical Presentations?

  Do you have a TOR for SC 121 available, as well? 

  Any bit of information will be helpful. 
  Thank you very much indeed. 

  Best regards, 

  Jan-Hendrik Oltmann 



