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S4GRU

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Posts posted by S4GRU

    T-Mobile setting the stage for 700 mhz LTE roaming agreements

    in Network, Network Vision/LTE Deployment

    Posted

    I doubt they'll ever be able to make a single device that will do all the 700 MHz band and there is no way to combine it all into a single band. Band classes 12 & 17 (lower 700 band) used by regionals and AT&T has an offset of 30 MHz (downlink channels are 30 MHz higher than the uplinks). Band class 13 (upper 700 band) used by Verizon has an offset of -31 MHz (downlink channels are 31 MHz LOWER than the uplinks). The RF electronics (diplexers / filters) would be far too complex to do in a single device with present technology. Maybe in a few years someone can design a filter and duplexer circuit that would work without causing interference and cross-operability issues.

     

    I hope it is sooner than that. I have big LTE roaming plans, and I won't be set back by mere physical limitations! Don't they know who I think I am?

     

    Robert

    • Like 2

    LTE / TD-LTE Compatibility

    in Network, Network Vision/LTE Deployment

    Posted

    I'm growing tired of reminding people of this: the chip's support of the bands is not an issue. The present Qualcomm MDM9600 modem (in the HTC Thunderbolt & Rezound along with numerous AT&T devices and the upcoming iPad3) used for LTE does Verizon 700, AT&T 700, and will work in PCS, AWS, and all defined LTE bands. The problem is the RF electronics (preamps, diplexers, filters) and antennas. There is not physical room to support more than 1 or 2 LTE bands on a phone that will fit into your pocket. The only phones approved with more than a single LTE band class are the upcoming AT&T phones approved for 700 and AWS, and the reason they're approved is because they only have to support 2 bands of GSM/GPRS/HSPA. So 4 bands total.

     

    4rings...yes you have definitely posted that before. I appreciate your info, even if you are an overly direct communicator. :P

     

    Robert

    Will NV Rollout Cover an Entire Market?

    in Markets

    Posted

    Thanks Robert, and everyone, for the helpful info. Glad to hear that Raleigh/Durham made the second round list.

     

    One other question on the map image that's in the announcement from today, is the actual map itself is available? I'd like to be able to click around and find where some cell sites are. I've used Open Signal on my android phone to try to find which tower I'm connecting to but when I drove past where it's telling me the tower is I don't find a tower.

     

    I see a few towers in the area, a few miles away, but I don't know which is Sprint versus Verizon, AT&T, etc. And those are a bit south of where it's telling me I'm connected.

     

    It is not public. It's my own personal resource. It is something I am trying to work out logistics for to open up to our S4GRU Sponsor members. But will likely involve accepting a confidentiality agreement to get access to.

     

    - Robert

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