Let the games begin!
in [Wireless Internet]
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From: Jeff Liebermann on 4 Jul 2010 01:26 On Sat, 03 Jul 2010 21:42:45 -0700, nospam <nospam(a)nospam.invalid> wrote: >> Yep. Worse, when the system is really busy, like during rush hour, >> VZW will drop calls that have been running for over 10-15 minutes to >> make room for new callers. I suspect the other service providers are >> doing something similar. > >are you referring to cdma cell shrinkage? that is *really* hard to >explain to people. No, not CDMA cell breathing, although that could contribute to disconnects. <http://www.macltd.com/datafile_downloads/MAC%20Ltd%20-%20Cell%20Breathing.pdf> It's just an increase in the noise floor with CDMA causing a decrease in usable range. What's happening is the Verizon got too many complaints about busy signals and incoming calls going directly to voice mail. Since the cell capacity could not be easily or economical increased without additional frequencies, Verizon opted to kick off the ratchet jaw yackers and allow new calls to have priority, when the system gets busy. That eliminated most of the busy signals. Meanwhile, those getting kicked off never suspected that the call was intentionally dropped, and probably guessed that they had driven through a weak signal area, or that a handoff had failed. It's possible that VZW is also dropping weak (low SNR) calls when the system gets busy, on the assumption that they're going to drop out anyway. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Kimmy Boyer on 4 Jul 2010 06:51 On Sat, 03 Jul 2010 22:34:15 -0600, Todd Allcock wrote: AllCOCK? Lemme see.
From: John Navas on 4 Jul 2010 10:30 On Sat, 03 Jul 2010 21:35:50 -0700, in <gp2036pkfqgq665djupris1ps6a9msh37q(a)4ax.com>, Jeff Liebermann <jeffl(a)cruzio.com> wrote: >Yep. I'm not surprised. AT&T got severely embarassed when Verizon >published the real map of their 3G network. Since they can't build >the network fast enough, might as well remove the tools needed to >attach numbers to the coverage. > >Apple: You don't need to know. >AT&T: We don't want you to know. Verizon: You think you know but the map's not accurate, in addition to being misleading about the difference between 3G and total coverage. (That's based on real experience comparing the map to actual coverage.) >Yep. Worse, when the system is really busy, like during rush hour, >VZW will drop calls that have been running for over 10-15 minutes to >make room for new callers. I suspect the other service providers are >doing something similar. It's really difficult to tell what caused a >call to drop from the handset end. On what do you base that? My friend at Verizon claims the real issue is cell "breathing". -- Best regards, John "Never attribute to malice that which can be adequately explained by stupidity." [Hanlon's razor]
From: John Navas on 4 Jul 2010 10:31 On Sat, 03 Jul 2010 22:26:25 -0700, in <r26036la31tt3cq2jnneh9k64ui41mvrgr(a)4ax.com>, Jeff Liebermann <jeffl(a)cruzio.com> wrote: >On Sat, 03 Jul 2010 21:42:45 -0700, nospam <nospam(a)nospam.invalid> >wrote: > >>> Yep. Worse, when the system is really busy, like during rush hour, >>> VZW will drop calls that have been running for over 10-15 minutes to >>> make room for new callers. I suspect the other service providers are >>> doing something similar. >> >>are you referring to cdma cell shrinkage? that is *really* hard to >>explain to people. > >No, not CDMA cell breathing, although that could contribute to >disconnects. ><http://www.macltd.com/datafile_downloads/MAC%20Ltd%20-%20Cell%20Breathing.pdf> >It's just an increase in the noise floor with CDMA causing a decrease >in usable range. > >What's happening is the Verizon got too many complaints about busy >signals and incoming calls going directly to voice mail. Since the >cell capacity could not be easily or economical increased without >additional frequencies, Verizon opted to kick off the ratchet jaw >yackers and allow new calls to have priority, when the system gets >busy. That eliminated most of the busy signals. Meanwhile, those >getting kicked off never suspected that the call was intentionally >dropped, and probably guessed that they had driven through a weak >signal area, or that a handoff had failed. It's possible that VZW is >also dropping weak (low SNR) calls when the system gets busy, on the >assumption that they're going to drop out anyway. Again, on what do you base that? My friend at Verizon claims the only real issue is cell "breathing". -- Best regards, John "Never attribute to malice that which can be adequately explained by stupidity." [Hanlon's razor]
From: John Navas on 4 Jul 2010 10:32
On Sat, 03 Jul 2010 22:23:24 -0700, in <4c301ac7$0$22139$742ec2ed(a)news.sonic.net>, SMS <scharf.steven(a)geemail.com> wrote: >On 03/07/10 9:35 PM, Jeff Liebermann wrote: >> On Sat, 03 Jul 2010 20:59:37 -0700, nospam<nospam(a)nospam.invalid> >> wrote: >> >>> some users report call drops on the iphone 4 and others don't. >> >> The AnandTech review showed a -24dB max drop in signal level when the >> phone is improperly held: >> <http://www.anandtech.com/show/3794/the-iphone-4-review/2> >> That's huge. That's about a 1/250th decrease in signal. As the >> author indicates, if the phone has a fairly strong signal to start >> with, it won't drop the call. However, if the signal is modest or >> weak to start with, a -24dB decrase will drop the call. I never saw >> anything near -24dB drop when fondling the antennas on various cell >> phones. My first guess was too high an antenna Q. I then guessed >> VSWR shutdown. Maybe my first guess was right? >> >>> you'll be disappointed to learn that the iphone 4 has removed field >>> test mode. >> >> Yep. I'm not surprised. AT&T got severely embarassed when Verizon >> published the real map of their 3G network. > >So much so that they launched a bogus lawsuit against Verizon. It accomplished its purpose, cheap wide publicity of how misleading Verizon's ad were. -- Best regards, John If the iPhone and iPad are really so impressive, then why do iFans keep making excuses for them? |