tag:blogger.com,1999:blog-17500930.post6640065015296476296..comments2024-03-20T22:57:03.923+00:00Comments on Dean Bubley's Disruptive Wireless: When is mobile VoIP not really mobile VoIP?Dean Bubleyhttp://www.blogger.com/profile/05719150957239368264noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-17500930.post-50608227503947277402008-09-03T21:58:00.000+01:002008-09-03T21:58:00.000+01:00HerveI'm in complete agreement - I wrote a researc...Herve<BR/><BR/>I'm in complete agreement - I wrote a research report more than 2 years ago about the lack of IMS-capable devices, and there still aren't any that I would call fully-capable.<BR/><BR/>RCS is a start, but frankly I'm not impressed with that either.<BR/><BR/>One of the issues that is facing IMS and VoIP is that of battery life. Both VoIP itself, and especially always-on presence drains a huge amount of power. <BR/><BR/>If you have a 500 contacts, and expect to get real-time presence status updates from all of them(like PC IM clients), you'll essentially need the radio on (and not in "idle" mode) most of the time.<BR/><BR/>DeanDean Bubleyhttps://www.blogger.com/profile/05719150957239368264noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-7618486702838130732008-08-31T19:53:00.000+01:002008-08-31T19:53:00.000+01:00Dean, On a technical point of view, CS is rather e...Dean, <BR/><BR/>On a technical point of view, CS is rather efficient when QoS and efficiency over air are concerned. On the 2 IMS infrastructures I deployed, the mobile part was plain old CS for voice and video. I guess no mobile operator would appreciate its customers complaining for not being reachable outside 3G coverage (which is still poor outside cities). <BR/><BR/>Another technical point is the support of IMS on mobile devices. Try to find RCS devices (and RCS has quite a limited feature set!).<BR/><BR/>Last point, which isn't really technical but psychological: mobile operator fear VoIP like the MPAA hates broadband networks! I guess they’ll need strong arguments to be convinced and open their networks to the “VoIP menace”… And as there isn’t any IMS killer app for the moment, the ones I know work on it as an alternative technology rather than a short term replacement. <BR/><BR/>HerveAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-63572924625916171882008-08-26T20:53:00.000+01:002008-08-26T20:53:00.000+01:00DavideYes, I certainly agree that 2G / 3G devices ...Davide<BR/><BR/>Yes, I certainly agree that 2G / 3G devices will be around for many years, and I agree that full migration to mobile VoIP will occur slowly.<BR/><BR/>Deploying LTE for mobile broadband will depend on spectrum availability as much as anything else. If operators only have 5MHz channels, they may push HSPA further for a few years instead.<BR/><BR/>I think that some (most?) LTE operators will not deploy full IMS. While I don't think that IMS is completely useless, its value is much diminished from initial expectations. <BR/><BR/>Most future value in mobile LTE networks will not come from IMS session-based services, but from other aspects such as the web, mashups, Telco2.0-style collaborative business models, portals like Ovi and iTunes and so forth.<BR/><BR/>If the LTE standard is so specific that it assumes "all users will perform voice calls using IMS" then it will need to be revised, as that is patently wrong.<BR/><BR/>DeanDean Bubleyhttps://www.blogger.com/profile/05719150957239368264noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-56973682726609152282008-08-26T12:51:00.000+01:002008-08-26T12:51:00.000+01:00I agree it is a short-term solution, but I think w...I agree it is a short-term solution, but I think we should define what is "short-term" in this scenario.<BR/><BR/>Unless we talk about green-field operators, an operator has already an existing 2G/3G network that just works. Until now, there has not been a business reason to deploy IMS for delivering voice only. In theory, it should reduce OPEX, in practice it just increases CAPEX and it needs to coexist with the existing CS world.<BR/><BR/>Also, people will own 2G/3G terminals for several years, which further postpones the migration to a full VoIP mobile network.<BR/><BR/>In my opinion, operators will start deploying LTE just to provide mobile broadband and will keep their existing CS mobile networks for voice calls. <BR/><BR/>As the operators extend the LTE coverage, then they will deploy IMS and let LTE users to perform calls using IMS, as the LTE standard says. <BR/><BR/>Eventually all users will perform voice calls using IMS, but in case of LTE, this requires full LTE coverage and full availability of LTE terminals. So, I believe the "short-term" solution will be in place for quite many years.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-64030212555444854252008-08-26T11:26:00.000+01:002008-08-26T11:26:00.000+01:00DavideIn the original post I included the line &qu...Davide<BR/><BR/>In the original post I included the line "Will all phones and networks need to support GSM/UMTS in parallel, in perpetuity? "<BR/><BR/>As far as I can see, this is essentially what CS Fallback does. It forces voice through an LTE device's 2G or 3G radios instead. (Correct me if I'm misreading this).<BR/><BR/>Given that operators will want to start de-commissioning their GSM & UMTS networks at some point (especially if they want to refarm the spectrum for LTE), this is not a long-term solution. Short-term - yes, absolutely.<BR/><BR/>This will also impact devices that are running simultaneous voice and data applications, as either the data channel will need to be shunted back to 2G/3G as well, or it will need to be running both radios concurrently.<BR/><BR/>Or am I missing something here?<BR/><BR/>DeanDean Bubleyhttps://www.blogger.com/profile/05719150957239368264noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-71714960868704200672008-08-26T11:06:00.000+01:002008-08-26T11:06:00.000+01:00The standard solution to be used by operators in e...The standard solution to be used by operators in early LTE deployment will be CS-Fallback. <BR/><BR/>http://www.3gpp.org/FTP/Specs/html-info/23272.htm<BR/><BR/>Why you are not considering it as an option?Anonymousnoreply@blogger.com