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digiblur

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Everything posted by digiblur

  1. digiblur

    What is a PRL? - Part 2 - EVDO

    by Travis Griggs Sprint 4G Rollout Updates Monday, May 20, 2013 - 10:15 AM MDT In Part 1 of the "What is a PRL?" series we covered the the initial basics and building blocks of the PRL which covered the 1X portion of the wireless connection. I encourage you to read the article if you have not already done so. You may have seen the various claims of receiving faster or even slower speeds with the mysterious PRL update procedure that seems to randomly happen to our devices. In reality it could be possible that nothing changed in regards to EVDO at all in the PRL. After a PRL update is applied to the device, whether it is pushed from Sprint or user initiated, the CDMA radio will reset just like when airplane mode is cycled on and off. This causes the device to reacquire with the network which could change the site and/or channel the device was using previously. AJ wrote an excellent article, "Can toggling airplane mode actually improve your 3G data speeds?" explaining the EVDO acquisition process. With all that being said let's jump right in and look at a small piece of the PRL to determine how a device connects to the EVDO network. In a mock scenario, the device scanned and did not find signal for the SIDs 22443, 22430, etc but was able to acquire 4159. The device will then check to see if any data records are associated with the connection. The assn tag field for 4159 is a 5. Any records inside this one geo block are checked for the assn tag of 5. In some Sprint PRL versions, the creators have failed to place the EVDO record in the correct geo creating a type of orphaned EVDO record issue, but this is not the case with this example. Record #279 has an assn tag match for the value of 5. The record is analyzed and it is determined that the device will use acquisition record #59 with a 0084:0AC0 subnet and no roaming indicator. If no EVDO signal can be found in the area with this search criteria, the device will fall back to using 1X for data and periodically scan for EVDO. The EVDO subnet is very similar to a SID, but since it is a 128 bit address scheme it offers more combinations than a SID. If needed, the provider could actually assign different priorities to individual sectors of one cell site using the subnet IDs. You may have already noticed multiple SIDs in this block share the assn tag of 5 along with the same acquisition records. The PRL is designed like a relational database where redundant data is shared to save space. So, how does the device know which channels to scan for EVDO? Let's look at the acquisition records of 2 and 59 used by SID 4159. The PCS band channels 50, 75, 100, 175, 200, 250, and 25 are used to scan for SID 4159 1X. These are not the only channels that you device will actually use. These are only used to acquire the initial CDMA handshake. The basestation of the site may direct the handset to rest on channel 25 but during an active phone call channel 150 might be used if the other available channels are at capacity. For EVDO, the device will scan 75, 175, 225, and 250 with a subnet of 0084:0AC0. If another carrier's EVDO signal happens to be on one of these channels it will be ignored as the subnets do not match. Just like on the 1X side and explained in AJ's EVDO article referenced above, the channel scan is only utilized for the initial EVDO handshake. The cell site may have a channel available that is not on the PRL list, which your device could end up using based on the basestation configuration. After attempting to digest all of this material you can see how the new PRL file itself is usually not why the speeds decreased or increased. If the spectrum licenses allowed for it in the area, Sprint could add an additional EVDO carrier channel of 300 to all of the neighboring sites and all of the handsets will be able to use it. The users in this area would probably see faster speeds due to this without a single PRL update. How does EVDO roaming work? In this example the device is connected to SID 4160 which is Verizon Wireless. Using the same analysis explained above, we see a data record of 5 is assigned. "Wait! I thought Sprint used data record 5 already?" This is correct. While your device is roaming on 4160 for 1X connectivity it is also scanning for Sprint EVDO. In order to save on roaming costs, Sprint has designed the PRLs this way. One negative impact on the user is additional battery drain due to this scan combined with the already active scan to find a non-roaming 1X signal. In the standard PRL for residential accounts, EVDO roaming on Verizon Wireless is not allowed. You will only find EVDO roaming on smaller regional CDMA carriers in some areas. On certain corporate accounts, Sprint configures devices with PRLs allowing Verizon Wireless EVDO roaming. While roaming, whether it be 1X or EVDO, the Sprint Terms & Conditions state: "Sprint reserves the right, without notice, to deny, terminate, modify, disconnect or suspend service if off-network usage in a month exceeds: (1) voice: 800 min. or a majority of minutes; or (2) data: 300 megabytes or a majority of kilobytes." Stay tuned for part 3 of the “What is a PRL?” series. We will cover the 800SMR SIDS, 800SMR acquisition records, and the coveted MCC/MNC LTE records shown in the PRL screen shots above.
  2. digiblur

    Current Sprint PRLs

    If you need some help with figuring things out let me know, I'm sure I still have my PRL diff app/code kicking around somewhere in my backups.
  3. digiblur

    Network Vision/LTE - New Orleans Market

    The legacy site that just won't stop. Downtown Baton Rouge legacy rebuild. New single band antennas, new coax, and legacy cabinets moved from the roof to the sidewalk during the building construction. Figured some of you would get a kick out of these. http://imgur.com/D2d0auP http://imgur.com/TGetuhh http://imgur.com/GAJtN4F http://imgur.com/5oJCJ9R http://imgur.com/tKMYV2t
  4. digiblur

    Network Vision/LTE - New Orleans Market

    Still have my email notifications on this thread I see Yes, it would take a bit of work to swing back the yellow side. I still keep an eye on the Nextel sites around town to see if they are making a move yet. The kicker for me is still the downtown area is a Sprint wasteland combined with the no coverage inside the house. However I did notice they finally converted to a full build by the house instead of the LTE GMO configuration. I didn't see any 800 signals from it yet though.
  5. digiblur

    Current Sprint PRLs

    International cleanup basically. PRL Comparison of PRLS 55021 to 55022 -Removes- Geo:21 SID/NID 1525/65535 IUSACELL - MEXICO CITY MX Removed. Geo:21 SID/NID 24577/65535 Portatel Del Sureste - CHETUMAL MX Removed. Geo:21 SID/NID 24587/65535 Comcel - GUADALAJARA MX Removed. Geo:21 SID/NID 24589/65535 Portatel Del Sureste - QUERETARO MX Removed. Geo:21 SID/NID 24591/65535 Telecomunicaciones del Golfo - PUEBLA MX Removed. Geo:21 SID/NID 24593/65535 Portatel Del Sureste - VILLAHERMOSA MX Removed. Geo:21 SID/NID 24615/65535 Removed. Geo:21 SID/NID 24647/65535 Removed. Geo:21 SID/NID 24649/65535 Removed. Geo:21 SID/NID 24651/65535 Removed. Geo:21 SID/NID 24677/65535 Portatel Del Sureste - MERIDA MX Removed. Geo:21 SID/NID 24679/65535 Portatel Del Sureste - CAMPECHE MX Removed. Geo:21 SID/NID 24681/65535 Portatel Del Sureste - VILLAHERMOSA MX Removed. Geo:21 SID/NID 24685/65535 Portatel Del Sureste - TAPACHUL MX Removed. Geo:21 SID/NID 24749/65535 Removed. Geo:21 SID/NID 24799/65535 Portatel Del Sureste - Cd del Carmen MX Removed. Geo:21 SID/NID 24801/65535 Portatel Del Sureste - San Cristobal MX Removed. Geo:21 SID/NID 26883/65535 Portatel Del Sureste - TUXTLA GT MX Removed. Geo:21 SID/NID 25107/65535 Removed. Geo:21 SID/NID 25100/65535 Removed. Geo:23 SID/NID 32649/65535 Removed. Geo:25 SID/NID 14827/65535 Removed. Geo:25 SID/NID 14828/65535 Removed. Geo:25 SID/NID 14829/65535 Removed. Geo:25 SID/NID 14830/65535 Removed. Geo:25 SID/NID 14831/65535 Removed. Geo:25 SID/NID 14832/65535 Removed. Geo:25 SID/NID 14833/65535 Removed. Geo:25 SID/NID 14834/65535 Removed. Geo:25 SID/NID 14835/65535 Removed. Geo:25 SID/NID 14836/65535 Removed. Geo:25 SID/NID 14837/65535 Removed. Geo:25 SID/NID 14838/65535 Removed. Geo:25 SID/NID 14839/65535 Removed. Geo:25 SID/NID 14840/65535 Removed. Geo:25 SID/NID 14841/65535 Removed. Geo:25 SID/NID 14842/65535 Removed. Geo:25 SID/NID 14843/65535 Removed. Geo:25 SID/NID 14846/65535 Removed. Geo:25 SID/NID 14847/65535 Removed. -MCC/MNC Removes(LTE)- LTE Area-Geo:21 334/FFF RoamInd:Intl SID Link:IUSACELL - MEXICO CITY MX LTE Area-Geo:23 702/FFF RoamInd:Intl SID Link:Unk LTE Area-Geo:24 510/FFF RoamInd:Intl SID Link:Unk LTE Area-Geo:25 404/FFF RoamInd:Intl SID Link:Unk LTE Area-Geo:27 302/FFF RoamInd:Intl SID Link:Bell Mobility - MONTREAL PQ -MCC/MNC Adds(LTE)- LTE Area-Geo:22 510/FFF RoamInd:Intl SID Link:Unk LTE Area-Geo:23 404/FFF RoamInd:Intl SID Link:Unk LTE Area-Geo:25 302/FFF RoamInd:Intl SID Link:Bell Mobility - MONTREAL PQ
  6. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    It's okay AJ. You won the Internet.
  7. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    They signed off on it and put it on their site. Their problem.
  8. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    Wow.. With that bad of a test report then the real world tests will be interesting. Edit.. As in the fcc should have done a better job.
  9. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    Interesting that 12 and 17 aren't both listed the same.
  10. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    In the wireless world I'm a believe it when I see it type of person now.
  11. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    Only half the puzzle though. Like for instance there are no band 29 numbers since it is receive only. I take the numbers as a grain of salt. Hopefully the real world tests will be good.
  12. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    I honestly don't look at the numbers as we have seen some phones with bad numbers end up being good and vice versa.
  13. digiblur

    Motorola Nexus 6 (Was "Nexus X talk leaked?")

    Nexus6.. https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=830965&fcc_id=IHDT56QD1
  14. OTA'ers rejoice! Yay! Or as others call it. cordcutters.
  15. I haven't looked at the PSC stuff yet for a pattern but here's what I have from my notes (figured I would share in case others need it as well) 310-410 AT&T - 1c = 1 carrier(channel), 2c = 2 carrier, etc. HSPA Pattern CID 11961 belongs to site 1196. The 1 is the sector/carrier designation. The sector and carriers are as follows for the first 3 subset of HSPA channels. 1=1c, 4=2c, 7=3c of the Alpha sector 2=1c, 5=2c, 8=3c of the Beta sector 3=1c, 6=2c, 9=3c of the Gamma sector 2nd subset of HSPA In most cases 4000 is added to the site number, in rare cases I've seen 4600 added. 1196 would become 5196. The sector and carriers are as follows for the second subset of HSPA channels. (sectors 4-6 seemed to be skipped) 1=4c, 7=5c of the Alpha sector 2=4c, 8=5c of the Beta sector 3=4c, 9=5c of the Gamma sector In summary, 11965 would be Site 1196 Beta C2 and 51969 would be Site 1196 Gamma 5c. LTE Pattern Last two digits of GCI to determine the band 0F, 10, 11 - B17 16, 17, 19 - B4 08, 09, 0A - B2 00, 01, 02 - B5 84, 85, 86 - B17 indoor DAS 64, 65, 66 - B17 wide area DAS Example GCI - 02C3CC0F - Remove the sector ID and convert to DEC - 02C3CC becomes 181196. The first two digits are the market/region ID. 1196 again is the site ID and matches to the HSPA side of the site. Occasionaly some sites will use the 4c,5c HSPA site IDs with the 4000 added to the number. I've seen this on older Band 4 upgrades with RRUS11 B4. I've seen them going back to the original site IDs(non-4000 incremented) when they've been converting them to B17/B4/B2 sites with the AIR21 B4A/B12P antennas with RRUS12 B12 with the A2 B2 backpack.
  16. digiblur

    Cheesy ESMR/LTE base station tracker

    Very nice looking. Definitely couldn't map out any of my sites without this app. Would it be possible to add a column or two at the end of the CSV file? The LTE GCI without the sector on the end and a band number based on the network and sector ID? I currently throw these in by hand with some Excel formulas. It helps to narrow things down on sites.
  17. Neighbors on different bands also show up on mine from time to time. I figured that was done by design of the LTE table on the site. I would watch it jump from band of 17 to 4 then to 2 on the same site.
  18. I am behind on this thread but I can pm you the pattern I found on HSPA cells. They also translate to the LTE side of the site to match things up.
  19. I've only tested this on the Samsung Note2, but I believe it also works on the S3 since they are so close in code bases. If anyone can test this on a S4 please let me know. If you've used an HTC device before you probably know how easy it is to add a shortcut to the Debug screen. On the Samsung devices it's a little bit harder. Here's how to set it up: Install SL4A from here: https://code.google.com/p/android-scripting/downloads/detail?name=sl4a_r6.apk&can=2&q= Open the App Hit your Menu button -> Preferences -> Scroll down and check Hide Notifications. (I think that's the only one I changed) Hit Menu -> Add -> Shell -> Type in debugmenu in front of the .sh Type this exactly in the box below the file name(it is case sensitive!) You can download the 4.3 Android Scripts with the information already typed and skip this step of creating the scripts, extract the zip to the sl4a folder on your sdcard: -Download 4.3 Scripts- For Android 4.3: su -c 'am broadcast -a android.provider.Telephony.SECRET_CODE -d android_secret_code://DEBUG' For pre-Android 4.3: am broadcast -a android.provider.Telephony.SECRET_CODE -d android_secret_code://DEBUG DO NOT put a space at the end. I had to hit space as my keyboard was underlining the last word. Hit Menu -> Save & Exit Tap debugmenu.sh -> then the little silver gear (2nd icon) It should open your debug menu. Go ahead and back out to your home screen. Tap and hold on your home screen and pick the option to add a Shortcut (this depends on your launcher) Pick the S4LA Icon with description of Scripts Pick your debugmenu.sh Make sure you pick the little silver gear That's it! Of course if you are running my ROM you won't have the 777468 code on the debug screen either, basically two actions to get into the LTE engineering screen.
  20. digiblur

    AT&T putting up new antennas and RRUs

    It was all about the maintenance, installers, and acceptance teams. AT&T uses Ericsson's gear here and it works just fine.
  21. digiblur

    Sprint is looking for a new Ad Agency

    Most I know mash the 30 sec skip button.
  22. Sprint needs to stop with the same mentality of having their cake and eat it too showing all that Verizon roaming coverage that no one can use. Terminate that roaming and just stick to your partners you enabled EVDO roaming on. 99% of the customers don't read roaming terms, look at maps, etc. They don't care. They just want to use their Facebook, text and talk to people. They don't look at any triangle or R on their phone etc. I agree on killing off the abusers roaming on purpose but with that they kill off even more customers. Sprint is in no position to do that.
  23. Luckily you don't run Sprint with your communist fist as they would have zero customers already. It's shocking you approve of a loss of revenue and image to the company you adore so much.
  24. Don't agree with that at all. For instance when we went to a non Sprint area this summer, the Sprint line with us didn't think twice about using her phone I have roaming. She pays for the line and expects it to work in the US. You have to think with a regular customer mindset. If she would have been charged for the extra usage for that week I can guarantee you that person will not be a customer any longer. Customer lost for years along with that customer venting to 10 other of her friends, all over a place that person won't go for years.
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