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About 4ringsnbr

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    Member Level: 3G EVDO
  • Birthday 06/08/1973

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    Motorola Droid RAZR MAXX
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    Baton Rouge, LA
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    4G Information
  • Favorite Quotation
    Those who can't compile their own kernel shouldn't operate a computer at all...
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    cars, computers, yoga, wine, running, & exercise

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  1. I don't know that DO Advanced will do anything to the 1x carrier associations. It may, but as far as I know (based upon Qualcomm's limited publications) it only allows the network to switch your EV carrier-- there's no indication that it will affect your 1x carrier for phone calls.
  2. Robert, this is CDMA, not GSM! On CDMA, the handset controls the handoff entirely. The only thing the tower can do on CDMA is command the handset to reduce the transmit power when the handset is too close to the tower to rectify the near-far problem. DO Advanced will allow the network to finally force your handset to switch EV sectors/towers. For now, your handset will always pick the sector with the best Ec/Io. It can also hook up to 2 or more sectors simultaneously. When it switches, the network FOLLOWS it, never commands it to switch.
  3. I'm afraid some of you (especially those in Boston) have stumbled onto the dirty little secret with network vision. The 4G LTE and eHRPD network (where EVDO will connect also) will be using new NV backhaul. The old 1x / EVDO (but non-eHRPD linked) network will use the old, existing backhaul and network. This is why the radios may be done, but there is no PDN gateway to tie LTE and eHRPD into. What this means in those areas is that 3G only phones will continue to see the same relative network performance after the NV upgrade; however, LTE-equipped phones connecting to 3G (via eHRPD) or LTE
  4. The 2.5 GHz spectrum is not frequency divided-- there are no separate uplink and downlink channels-- a 1.4x1.4 or 10x10 or any such type of carrier is not possible here. Only TD-LTE (time duplexed) can be done here. This means a 20 MHz channel can be divided (in time) between up and down time slices-- but the same channel is used for both. The duplex is done like WiFi or WiMax today: 10 ms of upload, a 1 ms "guard", then 20 ms of download for example would be a 1:2 up/down TD-LTE channel.
  5. One peculiarity with this phone as compared with all other Sprint ESMR handsets I've noticed. Every other handset has been approved from 817.9 - 823.1 MHz (channels 476 - 684). The HTC EVO LTE was approved only up to 822.75 MHz (channel 670). It would not be capable of using EVDO/1xA (CDMA) channel 676 should Sprint ever deploy a carrier here, although every other ESMR-enabled handset would.
  6. The LG Viper does do SVDO. None of the other handsets do. The Viper will join HTC's Thunderbolt and Rezound as the only SVDO handsets in North America. Implementing SVDO requires 2 CDMA baseband processors. It appears the EVO will rely on the single CDMA baseband built into its S4 SoC processor so no SVDO, but SVLTE should be supported.
  7. The LS-696 was approved in January a week after the Viper and it is 3G only. Sprint will continue to launch 3G only phones. I wouldn't expect ALL phones to be 4G LTE for another year or 2 at least. Some people DON'T want 4G phones with the battery drain.
  8. For Windows Phone fans, a new Sprint Windows Phone is on the way. The LG LS-831 was FCC certified for CDMA/EVDO operation in ESMR 800 / Cellular 850 / PCS 1900 bands. It has WiFi & Bluetooth. It does NOT have LTE or WiMax -- it is 3G only.
  9. AT&T and VZW had nothing to do with the band class split-- the FCC decided upon the duplex pairing by recommendations when they went to auction. The regulations are currently the limitation on the hardware. Phone manufacturers are in business to make money-- they want to sell the most devices they can at the most profit, so if they can make a device that'll work with everyone's network and be able to obtain FCC approval, they'll make it as long as it doesn't cost more to produce than they can sell it for. The carriers won't care as long as it supports their network and band class. Loo
  10. When was band class 26 approved? I only see 1-25 and the TDD classes 33-43 on the official lists... The other question is will the FCC allow a superset of ESMR and cellular since the two bands are governed by different rules (part 90S vs. 22H), which impacts power output limitations that would have to be enforced in some manner.
  11. I have seen reports that the FCC is looking into why phones cannot use LTE BC 12 in lieu of BC 17. Band 12 (regional carriers) is a superset of Band 17 (AT&T). I see no reason why these two band classes have to be separate. I don't see any way they can do anything about BC 13, however. It is backwards (uplink frequencies higher than downlink frequencies) in addition to having a different duplex spacing (-31 instead of +30 MHz).
  12. Just remember that the size of the antenna, and for EVDO, 1xA, & LTE Rx diversity or MIMO, the spacing between the two receive antennas is proportional to the wavelength of the frequency band. The lower the frequency, the larger the antenna (and space needed). This may be why all 700 LTE phones are huge! A quick approximation of the wavelength is λ = 300 / f, where f = frequency (in MHz) and λ = wavelength in meters. Typically a quarter wave antenna is favored, where the optimal antenna length is 1/4 the wavelength.
  13. More important to me than knowing what LTE bands may or may not be supported (at least for the next 2-3 years) is will this iPhone support CDMA in ESMR-- it is a PHONE after all, and if you want to call people, this would be beneficial for Sprint. Unfortunately, there has been no indication that Apple is interested in supporting an unusual band (ESMR), even for CDMA use (which is approved).
  14. According to this sketch, they're trying to support LTE bands 1, 2, 4, 5, 8, 13, & 17 with a single phone. Slight problem: band class 2 is PCS blocks A-F only; band class 25 is needed to support the G block. Also, band class 5 is Cellular 850-- it does not include ESMR 800. Band class 4 is AWS. I think 8 is European 900 Cellular and 1 is MSS. LTE band 13 is Verizon and 17 is AT&T (but not the regionals that use BC 12).
  15. Wow! It looks like North Mississippi along I-22 is going straight from 1x to LTE! It will leave those folks wondering what the 3G buzz was all about the past decade.
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