Hi, Do you if a DECT-GAP (or DECT-CAP) compliant handset MUST or MAY support roaming and handover and are these functions transparent for handset (then, these functions are implemented in DECT base stations) ? Regards -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080110/4254f602/attachment.htm
Michiel van Baak
2008-Jan-10 11:31 UTC
[asterisk-users] OT - Is handover included in DECT GAP ?
On 11:22, Thu 10 Jan 08, Olivier wrote:> Hi, > > Do you if a DECT-GAP (or DECT-CAP) compliant handset MUST or MAY support > roaming and handover and are these functions transparent for handset (then, > these functions are implemented in DECT base stations) ?Roaming/handover functionality is implemented in DECT-GAP. I dont know if all handsets allow it, but I think they do. -- Michiel van Baak michiel at vanbaak.eu http://michiel.vanbaak.eu GnuPG key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x71C946BD "Why is it drug addicts and computer afficionados are both called users?"
Robert Lister
2008-Jan-10 12:28 UTC
[asterisk-users] OT - Is handover included in DECT GAP ?
On Thu, Jan 10, 2008 at 11:22:29AM +0100, Olivier wrote:> Hi, > > Do you if a DECT-GAP (or DECT-CAP) compliant handset MUST or MAY support > roaming and handover and are these functions transparent for handset (then, > these functions are implemented in DECT base stations) ?Yes. It is a capability of the handset, where, as the user is moving about, the handset is continually scanning for the best channel/frequencies available from the base station. If a better signal than the one the user is currently using becomes available, (perhaps they have gone into a different room or moved behind a tree etc. meaning the current channel is weaker, then the handset will switch to using the better channel during the call.) There are a few systems out there that support multiple base stations which, to the handset, all look like the same registered base. (i.e, the handset only registers/authenticates once with the system (and not every base station) and then as the user moves about the handset, by virtue of always looking for the best channel, will hop from one base to the next. It does require that the system in the middle manage the database of registrations etc.) I've seen such capability on Siemens HICOM and Bosch PBXs, for example. All the DECT base stations are wired back to a central card in the system. I don't know if there is a standalone DECT IP offering supporting similar. The timing/clocking to support seamless roaming between the base stations is complicated and has to be very precise, so I imagine that such a system would need to have one central controller (and the SIP gateway function) with DECT base stations all wired out from there, rather than lots of independent DECT bases with Ethernet, that talk to a central unit over IP and somehow hand off the call. So to span multiple buildings you would probably need dedicated copper pairs or fibre to connect in the remote base stations to the central system. That is certainly the way it worked when I was last tinkering with DECT stuff. Although the Siemens switches could have multiple remote shelves connected over fibre to different buildings, the DECT bases all had to be connected via copper cables (and be powered on by) a central card in the main shelf, and could not be connected to a card in a remote shelf. (Or, you could have multiple PBXs and handsets roaming between different systems, but that starts to get expensive for maybe 10 users!) I have some detailed specs on it somewhere if you want more technical info. Rob
2008/1/10, Michiel van Baak <michiel at vanbaak.info>:> > On 11:22, Thu 10 Jan 08, Olivier wrote: > > Hi, > > > > Do you if a DECT-GAP (or DECT-CAP) compliant handset MUST or MAY support > > roaming and handover and are these functions transparent for handset > (then, > > these functions are implemented in DECT base stations) ? > > Roaming/handover functionality is implemented in DECT-GAP.Is it mandatory ? I dont know if all handsets allow it, but I think they do.> > -- > > Michiel van Baak > michiel at vanbaak.eu > http://michiel.vanbaak.eu > GnuPG key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x71C946BD > > "Why is it drug addicts and computer afficionados are both called users?" > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080110/4ec17b16/attachment-0001.htm