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Cellular Phone Forum / General / GSM / September 2003Signal problems: GSM, high rise
I live in a high rise apartment building in downtown Philadelphia. My T-Mobile Nokia 3390 works really well all throughout the city, the burbs, and basically everywhere I've taken it from Maine to DC. I usually have excellent coverage and decent sound quality, even, except for in one place... right inside my apartment, where I've got a horrible problem with dropped calls. I can easily lose a call every 30 seconds. My building seems to be made out of heavy concrete and I'm several floors up in a business district. Still, I can use my phone better in the elevator then I can in my own room! Should I bother trying a different phone, or, am I getting hit with awful multipath or something from the tall buildings and other RF around? Thanks john On Thu, 11 Sep 2003 13:22:46 GMT, in article <slrnbm0tp4.in8.photon@gibson.lawngnome.org>, <photon@lawngnome.gro> wrote: >Should I bother trying a different phone, or, am I getting hit with awful >multipath or something from the tall buildings and other RF around? None of the above. Just ask T-Mobile to put a site closer to you, that would be the best solution :) If that's not possible, just mount a directive antenna otside your apartment and plug it to the phone. -- D I E G O >I live in a high rise apartment building in downtown Philadelphia. You don't mention how "High" you are. Generally speaking "mobile phone" service is designed to be at ground level. Antennas are typically installed with a "downtilt" depending on how high they are and the surrounding terrain. I wouldn't expect service to be very good at all about 100' (roughly 8 floors high). -- John S. e-mail responses to - john at kiana dot net One of my strangest experiences was that T-Mobile service was completely unavailable outside on the observation deck at the top of the Empire State Bldg in New York, in any direction. Definite indication that all the cell towers are very directional towards the ground. It was very strange that I didn't pick up a tower further out towards the horizon. Mike Schumann > >I live in a high rise apartment building in downtown Philadelphia. > [quoted text clipped - 8 lines] > John S. > e-mail responses to - john at kiana dot net Dans l'article <3f63fca5$0$1095$6536d21b@news.bitstream.net>, mike- nospam@traditions-nospam.com nous disait... > Definite indication that all the cell > towers are very directional towards the ground. It was very strange that I > didn't pick up a tower further out towards the horizon. Despite the fact that antennas are downtilted, gsm towers are generally well (too well, in fact) received in high buildings. And rather than receiving only a few cells (like on ground level), one usually receive a lot of cells, with high interference levels that phone can't cope with. If the building has no dedicated pico-coverage, standby and calls are nearly impossible there... Using a phone with trace activated (Ericsson TEMS, Nokia netmonitor) can easily highlight this phenomena.  SignatureChristophe -- Couverture GSM Ol?ron 2003 http://chantoine3.free.fr >It was very strange that I >didn't pick up a tower further out towards the horizon. Keep in mind that all cellular systems are designed for re-use of frequencies and the lowest possible power off the tower (ERP). So in a city like NYC, the power from each of the cell sites is probably very low due to the large number of sites. -- John S. e-mail responses to - john at kiana dot net > >I live in a high rise apartment building in downtown Philadelphia. > You don't mention how "High" you are. Generally speaking "mobile phone" > service [quoted text clipped - 3 lines] > I wouldn't expect service to be very good at all about 100' (roughly 8 floors > high). Don't know what the problem is. But we used to take calls way up in a private charter turbo-prop planes during cruise.... >Don't know what the problem is. But we used to take calls way up in a >private charter turbo-prop planes during cruise.... Very much against the law by the way! "Used to" may have been awhile. I too have made calls from passenget jets and they worked. It really was possible in the "early days" as all the cellular systems were still in their infancy. A lot of times coverage was provided by a single base station with a single omni-directional antenna. These antennas had no down tilt and radiated in all directions. An omni pattern kinda looks like a donut with the antenna is in the center of the hole and the pattern radiated is outward, upward, and downward. -- John S. e-mail responses to - john at kiana dot net > >Don't know what the problem is. But we used to take calls way up in a > >private charter turbo-prop planes during cruise.... > Very much against the law by the way! Not when the pilot uses his mobile phone in the cockpit! > "Used to" may have been awhile. I too have made calls from passenget jets and > they worked. I would not operate my mobile in a commercial passenger jet. That's againist the regulation. We were on a private charter. Didn't see any sign nor were we informed that we can't use our mobiles. > > >Don't know what the problem is. But we used to take calls way up in a > > >private charter turbo-prop planes during cruise.... [quoted text clipped - 9 lines] > againist the regulation. We were on a private charter. Didn't see any > sign nor were we informed that we can't use our mobiles. The FCC rule, 47 CFR 22.925, prohibits the use of cell phones after the aircraft leaves the ground. This rule applies to all aircraft whether commercial or private or whether powered or simply a balloon. The FCC rule applies only to cell phones. It does not apply to other PEDs (Portable Electronic Devices). This rule was adopted in December 1991. It was based on the Commission's concern that use of cell phones in the air could interfere with the cell phone system on the ground. > The FCC rule, 47 CFR 22.925, prohibits the use of cell phones after > the aircraft leaves the ground. This rule applies to all aircraft [quoted text clipped - 3 lines] > 1991. It was based on the Commission's concern that use of cell phones > in the air could interfere with the cell phone system on the ground. 1. My experiences weren't in FCC airspace. 2. It was definitely after 1991. >It was based on the Commission's concern that use of cell phones >in the air could interfere with the cell phone system on the ground. EXACTLY!!! And has absolutly NOTHING to do with interference of the aircraft. -- John S. e-mail responses to - john at kiana dot net >> Very much against the law by the way! > >Not when the pilot uses his mobile phone in the cockpit! It's against the law in any plane. Traffic helicopters are usually flying at about 500' and it is against the law for them as well. Anything over 100' in a plane. Doesn't matter if the pilot it breaking the law or not, it is still againast the law. >I would not operate my mobile in a commercial passenger jet. That's >againist the regulation. We were on a private charter. Didn't see any >sign nor were we informed that we can't use our mobiles. It is the same rule. -- John S. e-mail responses to - john at kiana dot net |
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