Jump to content

WiWavelength

S4GRU Staff Member
 View Profile  See their activity

  • Posts

    18,133

  • Joined

  • Last visited

  • Days Won

    429

 Content Type 

Posts posted by WiWavelength

    HTC EVO 4G LTE

    in HTC

    Posted

    Finally got back from my Softball game. "SAR Test Report" on page 7 states it pretty clear there...interesting it was added there to be honest...not going to complain one bit though...

     

    Yes, Sgt., that chart in the SAR application is where I found the SVDO revelation. I have extracted the chart for reference:

     

    oucrpe.png

     

    AJ

    • Like 1

    Sprint 800 MHz LTE Set For Launch In 2014

    in Network, Network Vision/LTE Deployment

    Posted

    They also kinda thought they had Lightsquared sealed in too...but I believe the main reason was the towers are too far. My area doesn't have them close enough for 1900mhz in many places...2.5 would just be downright horrible on that tower spacing.

     

    For what Sprint and Clearwire have planned, TD-LTE 2600 site spacing will not matter. The idea is to deploy TD-LTE 2600 "hotspots" in high Erlang (to use a rather outdated term) cells. TD-LTE 2600, where available, will take offload traffic from LTE 1900/800 but will not need to provide contiguous coverage.

     

    AJ

    HTC EVO 4G LTE

    in HTC

    Posted

    Sprint is not planning anything 10x10.. Clearwire may, but no, the EVO is probably not going to support clearwire LTE

     

    That is generally but not entirely true. Obviously, Sprint is deploying a 5 MHz x 5 MHz LTE carrier in its PCS G block 10 MHz licenses. And, in markets where Sprint has sufficient spare spectrum or is able to clear enough spectrum for a second LTE carrier in PCS A-F block spectrum, Sprint will still most likely deploy another 5 MHz x 5 MHz carrier. Two 5 MHz x 5 MHz carriers, for example, will each have half the peak data throughput capability of a 10 MHz x 10 MHz carrier. Together, however, they will have the same aggregate data throughput capability as the twice as large single carrier. That said, in some markets, Sprint also holds the PCS C5 block 10 MHz license directly adjacent to its PCS G block 10 MHz license. In at least those markets, Sprint could potentially skip 5 MHz x 5 MHz LTE and go directly to 10 MHz x 10 MHz LTE.

     

    In one of my first pieces for S4GRU, I wrote about the availability of spectrum for additional LTE carriers. See this spreadsheet in this article:

     

    http://s4gru.com/ind...l-lte-carriers/

     

    AJ

    • Like 3

    HTC EVO 4G LTE

    in HTC

    Posted

    Through lte advanced I assume?...or this for the markets they hold enough to deploy that size?

     

    No, not through LTE Advanced spectrum aggregation. The EVO 4G LTE is not an LTE Advanced ready device.

     

    AJ

    WiMax Protection Site Operation Confirmation

    in WiMax

    Posted

    I always wondered if the FCC would care about T1's being used in protection sites.

    That is a good point. Maybe the FCC didn't care as long as the protection sites were just operational, let alone fast enough to support high speed data. Just hopefully when they upgrade to LTE they upgrade the backhaul on those sites.

    Or they just have bigger fish to fry....ie lightsquared. Lol

     

    I have long thought that the FCC needs a Spectrum Czar -- namely, me. ;)

     

    AJ

    • Like 5

    S4GRU Teaser Discussion

    in Suggestion Box

    Posted

    Sgt., this is not aimed directly at you, though I certainly do want to attend to some of your honest concerns. More so, however, I want to address this to all S4GRU participants so that we can all come to a greater respect for both sides of the content creation/consumption relationship.

     

    Robert, the other contributors, and I work numerous hours researching, writing, and now even gathering data in the field. We do it for no pay. In fact, some of us do it for a net monetary loss. I know that Robert has reached into his own pocket to bring S4GRU to everyone, and I plunked down $1700 for a spectrum analyzer in large part for the advantages that it would give S4GRU in field research. So, we the contributors certainly do not do this for the money. Rather, we do this for elucidation and enjoyment -- both yours and ours. With that in mind, please forgive if we occasionally try to build some intrigue and anticipation -- yes, you can even call it a tongue in cheek "tease" -- for our hard work yet to come.

     

    That said, I want to propose an idea, something of a compromise. Interspersed among the usual feature length articles, would you appreciate shorter, paragraph length articles that Robert, the other contributors, and I could write more readily and post to The Wall more frequently? For example, the removable SIM card roll out is little more than a bullet point within a date range on the Network Vision Roadmap. Right now, that is about all that we know -- not enough to warrant a full length article. But such could be worked into a paragraph length article about how removable SIM cards should be coming but not in the initial LTE handsets.

     

    Robert, Sgt., and all other interested or involved parties, what are your thoughts? (And, moderators, if you want to move this to a more topical thread, feel free to do so.)

     

    AJ

    • Like 2

    LTE / TD-LTE Compatibility

    in Network, Network Vision/LTE Deployment

    Posted

    EVDO requires Rx diversity too, so an extra antenna is needed per band on top of the CDMA / 1x antennas.

     

    I can find no real world basis for the frequent claim that EV-DO "requires" Rx diversity. If anything, I find more evidence for the contrary. Take the Samsung Illusion, for example, a plain Jane EV-DO 850/1900 handset on VZW. See the antenna block diagram (from the FCC OET filing):

     

    6gltll.png

     

    Now, unless the Samsung Illusion incorporates Rx diversity within that ~20mm x ~20mm single WWAN Tx/Rx antenna array, then EV-DO seemingly cannot "require" Rx diversity.

     

    AJ

    • Like 1

    LTE / TD-LTE Compatibility

    in Network, Network Vision/LTE Deployment

    Posted

    I posted about the Nokia Lumina 900 and it seems to prove that you can stuff a TON of bands inside a phone.

     

    It seems like the number of bands isn't that big of an issue. Not sure how they do it, or how many antennas it has (looks like two... but not sure).

     

    Any insight?

     

    GSM 850/900/1800/1900, WCDMA 850/900/1900 and LTE 700/1700/2100.

     

    irev, in this and your aforementioned previous post, you seem to confuse bands with modes.

     

    Cellular 850 MHz, GSM 900 MHz, DCS 1800 MHz, and PCS 1900 MHz are four bands. Band wise, the GSM and W-CDMA distinctions are irrelevant; those airlinks represent only separate modes. So, just four bands are needed to cover the GSM and W-CDMA modes.

     

    As for LTE, Lower 700 MHz and AWS 2100+1700 MHz are separate bands. Also, "2100" may indicate IMT 2100+1900 MHz as an additional supported band. While all three are indeed separate bands, they may not, for example, require as many additional antennas (or antenna capabilities) as meets the eye.

     

    Lower 700 MHz, yes, requires its own compatible antennas. However, AWS and IMT share essentially the same downlink frequencies, hence can share the same downlink MIMO antennas. Furthermore, since LTE uplink MIMO is not apt to be a reality on handsets anytime soon, a single antenna per uplink band should suffice. AWS uplink corresponds very closely to DCS uplink, while IMT uplink corresponds very closely to PCS downlink. So, those antennas may be reused.

     

    Now, that said, all bands do require appropriate power amp modules and filters, so it is still no free lunch. But my primary point is that you inflate the number of bands. For further clarification, see the previous thread:

     

    http://s4gru.com/ind...okia-lumia-900/

     

    AJ

    Network Vision/LTE - Swiftel Market (Sioux Falls/Sioux City/Brookings)

    in Markets

    Posted

     

     


    There were rumblings in 2009 that swiftel had agreed to be sold to another company (not wireless)...


    Yes, that is partly correct. In fact, just a few weeks ago, Robert and I were discussing Swiftel's canceled buyout. The buyer was Crossroads Wireless, which was a Sprint Rural Alliance partner.

    For the Swiftel buyout applications, start with the 6/30/2008 Assignment of Authorization. Click on each application link, then click on the Admin tab within that application. Toward the middle of each application Admin page, you will find the attached document(s). Start here:

    http://wireless2.fcc.gov/UlsApp/UlsSearch/allApplications.jsp?licKey=193016

    Crossroads was to be focused on rural highway coverage (hence, the name), so Swiftel and its I-29 centered footprint would have been a natural fit for Crossroads. Sprint partitioned and disaggregated some 10 MHz blocks of PCS spectrum to Crossroads for the rural highway buildout.

    For the partitioned and disaggregated spectrum, see Attachment 1 from this application:

    http://wireless2.fcc.gov/UlsApp/ApplicationSearch/applAdmin.jsp?applID=4627816

    However, Crossroads ran into severe financial difficulties and filed for bankruptcy protection. So, the Swiftel acquisition was aborted and the rural highway buildout never happened. To add insult to injury, Crossroads, as Debtor-in-Possession, even liquidated the spectrum that Sprint had partitioned and disaggregated to it, and sold that spectrum to VZW, AT&T, et al.

    See Restated Order Approving Spectrum Sales here:

    http://wireless2.fcc.gov/UlsApp/ApplicationSearch/applAdmin.jsp?applID=5087986

    AJ

    Network Vision/LTE - Swiftel Market (Sioux Falls/Sioux City/Brookings)

    in Markets

    Posted

    One of the only reasons I took the smartphone plunge was I got rid of home internet to cut costs.

     

    That is a big part of your problem. Mobile wireless broadband is not a replacement for wired (or fixed wireless) broadband. And, honestly, I look askance at people who try to cut costs by living on their mobile wireless broadband connections at home because those people just exacerbate the slow data speed problems that you are complaining about.

     

    Femtocells and Wi-Fi offloading are becoming a fact of life in the wireless industry. On purely macro cellular networks, we simply do not have enough available spectrum, nor can we ever clear enough spectrum to keep up with the public's newfound (read: iPhone inspired) insatiable appetite for data. So, we (both wireless carriers and individual subs) are going to have to mix in smaller cells and Wi-Fi offloading among the macrocells in so called heterogeneous networks or "het nets" in order to keep up with demand.

     

    My advice is to get your home broadband connection back, and embrace femtocells and Wi-Fi offloading. That is a big part of the solution. And, as the old saying goes, if you are not part of the solution, then you are part of the problem.

     

    AJ

    • Like 4

    Network Vision/LTE - Swiftel Market (Sioux Falls/Sioux City/Brookings)

    in Markets

    Posted

    Also, keep in mind that Brookings Municipal Utilities d/b/a Swiftel became a Sprint affiliate in 1998-1999. At that time, the Cellular 850 MHz competitors in South Dakota were WWC (Western Wireless) and AirTouch. And both may have been AMPS only. So, Swiftel may have seen that as prime opportunity to bring Sprint's CDMA based PCS 1900 MHz service to South Dakota. VZW did not even exist yet, as the VZW merger did not occur until 1999-2000, so nobody knew that there would be a VZW nor an AT&T that would go on to become such anti competitive asshats and try to buy up or drive out of business all other wireless carriers.

     

    AJ

    • Like 4

    Spectrum licenses map

    in Network, Network Vision/LTE Deployment

    Posted

    Would be nice to have that data on the spectrum map too.

     

    Highly doubtful. Microwave backhaul links are the information superhighways of the sky. There are tens of thousands of them nationwide, as they are licensed point to point, and frequencies are reused enormously. So, mapping microwave links would be a ridiculously large and fruitless task.

     

    AJ

×
×
  • Create New...