> On Oct 11, 2013, at 7:11 PM, "Manfredi, Albert E" > <albert.e.manfredi@xxxxxxxxxx> wrote: > I continue to wonder why the US cellcos would allow this to happen, UNLESS > the LTE overlay network were their own. We have the unfortunate situation > where cellcos control what type of phone they'll allow. It seems unlikely > that they would allow free access to TV to their phones, over someone else's > LTE frequencies, any more than they jumped at the opportunity to use ATSC-MH. So many misconceptions here! First, there is nothing to stop the telcos from offering LTE Broadcast EXCEPT: 1. Spectrum - they need to satisfy the need for paying data customers first; 2. Content - they would need to compete for the rights for the content people WANT on mobile devices connected to LTE networks; content delivered over wired broadband via Wi-Fi is a different animal. And they would need to build "broadcast infrastructure" to deliver the content, sell ads etc. By working with the MVPDs as they do today, they benefit by SELLING larger data plans. Selling content subscriptions has not been successful ( e.g. Florida TV). FREE over LTE would require substantial ad revenue to be profitable. 3. The telcos are rapidly moving to a business model where third parties own and operate the tower infrastructure; most tower sites already support multiple carriers and could easily support LTE Broadcast, for the telcos, or for current broadcasters; and in rural areas existing big sticks could support LTE Broadcast. 4. The telcos no longer control the devices that connect to their networks. Apple, Google and to a lesser extent Microsoft/Nokia now control the devices and the content/apps. The only services the telcos control are traditional voice and a declining portion of the text message market, which is becoming another "data service." And voice (VOIP) is likely to replace voice minutes soon (more on this in a moment). It is true that devices must still be optimized for certain networks due to proprietary modulation schemes, different frequency bands, and some proprietary baggage, but technology is mitigating this problem the new Qualcomm radio chip that Apple and other device manufacturers are starting to deploy, supports multiple modulation schemes and more RF frequencies. 5. Support for ATSC-MH requires another chip - the telcos and device manufacturers were NEVER going to support this. Support for LTE Broadcast is virtually free in most devices, and there is little that the Telcos can do to block this - it's just another App. I would note that there are a few handsets that support FM radio. > The other thing is, wouldn't it be nice, for robustness, to create some sort > of n-FSK scheme that had adequate b/s/Hz? Seems like not doable, but FM is > more impervious than PM to distortions. I think the original 2G GSM used FM > (it was called GMSK), but it was limited to something like 1 bit per symbol. > Got to do some more searching on this topic. > In an LTE world, robustness comes from adequate cell density to provide good RF connections and to meet demand. Cell density for telco data services is necessarily much higher in urban areas because of user density and unicast demand. Cell density for LTE Broadcast can be lower as everyone is receiving multicasts - but you still need a fair amount of spectrum to checkerboard coverage as SFN's are not practical for an LTE overlay network. If broadcasters do something proprietary they are toast. The government will not mandate another broadcast standard - they want to monetize the broadcast spectrum. Regards Craig ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.