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WiWavelength

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Everything posted by WiWavelength

  1. WiWavelength
    That is digital filtering. It works well for digital audio. But modulated RF is analog. AJ
  2. WiWavelength
    No. First, DC-HSPA+ 84 requires 20 MHz of spectrum, which is what T-Mobile currently requires for DC-HSPA+ 42. That precludes DC-HSPA+ 84 in markets where T-Mobile currently has only enough spectrum for HSPA+ 21. And those market numbers will grow, as T-Mobile shifts more and more spectrum to LTE. Second, DC-HSPA+ 84 requires 2x2 MIMO, and MIMO does not seem to play well with existing W-CDMA. So, as far as I know, few W-CDMA operators have implemented MIMO. That is better left to LTE. AJ
  3. WiWavelength
    Maybe, but I have yet to see any evidence that USCC is operating in the Lower 700 MHz A block specifically inside any of the DT channel 51 contours. Those "new" GPS devices would have been very large and expensive to accommodate very sharp bandpass filters. Or, more likely, they would have remained small and inexpensive but had significantly lower GPS signal sensitivity. Again, filters are not perfect. AJ
  4. WiWavelength
    At this late date, the "i" in iPhone 4 stands for "i think i be moving up in the world because i finally gots me an iPhone." AJ
  5. WiWavelength
    Filters are subject to the limitations of physics; thus, they are not perfect. If they were, then LightSquared's plan would have worked. AJ
  6. WiWavelength
    Guys, those DT channel 51 protection zones follow their stations' Grade A Contours, which can easily extend 60 miles outside of urban areas. In other words, they impede the most valuable rural areas, too. AJ
  7. WiWavelength
    Yeah, you should know this. CDMA1X is 3G, so your question makes no sense. AJ
  8. WiWavelength
    Yup. AJ
  9. WiWavelength
    If he were so smart, he would notice the "y" missing from the end of his last name. As Adam Carolla would say, "That is almost a name..." AJ
  10. WiWavelength
    And what if I refuse to kneel before a slack jawed yokel? The kind of person who sees the Nextel iDEN countdown clock and says things like, "Look, Ma, it's a fancy number cipherin' machine." AJ
  11. WiWavelength
    Not feasible. AT&T is quite roaming averse with regard to T-Mobile. Moreover, 3GPP devices operate as single mode between W-CDMA and LTE, unlike 3GPP2 devices, which operate as dual mode between CDMA2000 and LTE. So, for example, a Sprint device can be CDMA1X roaming on VZW and simultaneously on native Sprint LTE -- as we have seen members post, erroneously thinking that they were roaming on VZW LTE. But an AT&T device could not be LTE roaming on T-Mobile and simultaneously on native AT&T W-CDMA. The device is single mode: it is either on LTE or W-CDMA. And when that AT&T device roaming on T-Mobile LTE would use CSFB to W-CDMA, it would be on T-Mobile W-CDMA. In the end, it would be like AT&T putting a segment of its own subs on the T-Mobile network. Not gonna happen. AJ
  12. WiWavelength
    No way! That must be new. It could not have been the fully disclosed situation for years now. Google must be creating a dossier on me personally. Oh, I feel like my privacy has been violated! AJ
  13. WiWavelength
    Commiserate with your compatriots in the IBEZ along the Mexican border by cracking open a Dos Equis. Not having SMR 800 MHz makes you "The Most Interesting Man in the World." AJ
  14. WiWavelength
    Oh, come on. In good fun, I teased *another staff member* about his use of an iPhone. Because of its locked down, walled garden nature, iPhone cannot do many of the things that wireless network nerds do, such as use Sensorly mapping, swap PRLs, have fully functioning engineering screens, etc. That does not make anyone who chooses an iPhone a "moron, rube, technophobe, or whatever" -- those are your words. But it does take away from their wireless network nerd-dom, as they prioritize less the things that wireless network nerds prioritize most. In the end, iPhone users need to buck up and be less sensitive. As for worrying greatly about "Page, Brin, Schmidt & Co" mining your data, that is flat out paranoia, the realm of the tinfoil hat crowd. AJ
  15. WiWavelength
    You are new here, so you get a little leeway. But these issues have been hashed out many times over in numerous other threads. A few search queries and some reading are your friends. Long story short, many people fail to understand that the losses you speak of are mostly paper losses and actual losses from continuing to operate the dead weight Nextel iDEN network. The Sprint CDMA2000 network, on the other hand, is profitable. But the Nextel iDEN network goes the way of the dodo in less than a month. The losses will soon come to an end. As for the Sprint network, Clearwire's WiMAX deployment was supposed to absorb a lot of the growing data traffic. But Clearwire ran into financial problems and failed to follow through. Sprint's plan to keep its network current was fine; Clearwire's execution of that plan was not. AJ
  16. WiWavelength
    Well, you were not connected to LTE at the time, though you may have been connected to LTE from another site just prior to that time. At the very least, the downlink EARFCN is a null result, as 65535 is the largest possible 16 bit integer. And I have seen the same null result on an HTC engineering screen shortly before or after an actual LTE connection. AJ
  17. WiWavelength
    But those are not the primary concerns of wireless *network* nerds. Those sound like the priorities of phone enthusiasts or even average citizens. AJ
  18. WiWavelength
    If throttling does not affect the ability to stream content, and incessant streaming is the largest consumer of wireless data, then how does your level of throttling solve the problem? A few months ago, I wrote the following: AJ
  19. WiWavelength
    Nah, patches are hardly what drives most obsession with OS updates. It is more like, "Waaa, waaa, I want Jelly Bean." AJ
  20. WiWavelength
    "Small cell" talk? AJ
  21. WiWavelength
    Nope. Honestly, I do not get the infatuation with Nexus devices and OS updates. Give me OEM customized Android with engineering screens any day. And who cares about OS updates? That is more about the psychology of the supposed "latest and greatest" than any tangible benefit. If you ask me, save the next OS version for your next device. AJ
  22. WiWavelength
    Once you go down the path of point to point wireless backhaul, you are likely no longer looking at a small cell. You need radome(s) and a highly elevated structure -- all of which sounds more like a macrocell. AJ
  23. WiWavelength
    Milan Milanovic and I are researching and writing an article on T-Mobile's deployed LTE FDD bandwidths. Here is an engineering screenshot from Austin: AJ
  24. WiWavelength
    Not bloody likely. Have you actually traveled this country? Maybe that would work in North Carolina, but not from the Great Plains through the Rocky Mountains. Small cells would not cut it for coverage across the wide open spaces. And they would not be "a fraction of the cost." The real cost would come from running fiber backhaul to those multiple small cells -- fiber that does not exist. If anything, those multiple fiber links could increase the cost. AJ
  25. WiWavelength
    I can confirm that T-Mobile in Austin is currently 5 MHz FDD. Spectrum wise, it does not make sense. But Houston and San Antonio follow the same pattern. So, it must be a Texas thing, possibly due to a preponderance of Mexicans and Asians with GSM only or single band AWS W-CDMA handsets. AJ
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