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Cellular Phone Forum / General / GSM / February 2005GSM noise in speakers even when phone is not receiving SMS or changes transmitter
As most GSM users know, you can tell that a GSM phone is sometimes transmitting data, if it lies next to a speaker or headphone. For example when the phone receives an SMS, or when you travel and the phone changes to a different transmitter station. My question is: Why is it that GSM phones sometimes transmit data, even when the phone does not receive an SMS or changes the transmitter phone? If this happens for no apparent reason, could it be interpreted as a clear sign that the phone is being "homed" or positioned, for example by the police? Or are some carrier networks simply programmed to, on a regular basis, check up with the phone if it's still turned on? (If it's relevant, my carrier network is Vodafone of Sweden. (If you wonder wny I don't ask them directly, well it's because their customer support department never respond to the email that I send them, for some funny reason)) Please email me a copy of any replies. Thank you! > As most GSM users know, you can tell that a GSM phone is sometimes > transmitting data, if it lies next to a speaker or headphone. For [quoted text clipped - 17 lines] > > Please email me a copy of any replies. Thank you! I'm sure you will get more technical replies than mine, but basically my understanding is that the phone checks in with the network every so often just to keep it up to date of it's location. I wouldn't worry about it too much.  Signature73 de Simon, VK3XEM. http://www.aca.gov.au/pls/radcom/client_search.client_lookup?pCLIENT_NO=157452 The views stated by me are my own and have nothing to do with any organisation I belong to, so the prick that tried to slander me can get f.cked because it didn't work! >My question is: Why is it that GSM phones sometimes transmit data, >even when the phone does not receive an SMS or changes the transmitter >phone? See http://ccnga.uwaterloo.ca/~jscouria/GSM/gsmreport.html#4.6 "For reliability reasons, GSM also has a periodic location updating procedure. If an HLR or MSC/VLR fails, to have each mobile register simultaneously to bring the database up to date would cause overloading. Therefore, the database is updated as location updating events occur. The enabling of periodic updating, and the time period between periodic updates, is controlled by the operator, and is a trade-off between signalling traffic and speed of recovery. If a mobile does not register after the updating time period, it is deregistered. "A procedure related to location updating is the IMSI attach and detach. A detach lets the network know that the mobile station is unreachable, and avoids having to needlessly allocate channels and send paging messages. An attach is similar to a location update, and informs the system that the mobile is reachable again. The activation of IMSI attach/detach is up to the operator on an individual cell basis." As I understand it, the network is checking if the phone is still switched on and in range of a cell. SignatureRegards John Riggs >As most GSM users know, you can tell that a GSM phone is sometimes >transmitting data, if it lies next to a speaker or headphone. For [quoted text clipped - 4 lines] >even when the phone does not receive an SMS or changes the transmitter >phone? Operators of GSM networks 'poll' phones at some interval. I have seen it as often as every 4 hours or so, or as rarely as once a day. The poll verifies that the phone is still on he network, and on. If there is no response, than if roaming, the original service provider is notified that the phone is no longer roaming. Frequent pollling does does ugly things to standby time. It also saves time when sending SMS or calls to the phone to know roughly where it is. My T-Mobile USA phone "checks in" precisely every 30 minutes. Signature\/ L /\ D Operators of GSM networks 'poll' phones at some interval. I have seen it as often as every 4 hours or so, or as rarely as once a day. That is correct...about every 5-10 mins your phone will connect to th network to update the IRDB (the software in the phone)...this is wha cingular calls it...if the IRDB fails to update then sometimes you calls will not sound right and the internet may not work correctly whe we update the network....If you are having a problem..If you hav cingular..you would want to call cust care and inform them that yo were told to have a new OPL push or Single Push sent to you phone.....after thay send it to you you would want to do a hard shoc to your phone which means to take out the battery while the phone i still on..***a hard shock will fix almost all problems on a GS phone***PLEASE DO NOT TRY ON A GAIT PHONE!!!!!!....If you have any mor questions email me...You might tell that I work for customer care fo cingular. LOL tomcat592@sbcglobal.net Travi -- tomcat592 |
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