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Time Determination Scheme When NITZ Information Is Not carried by GMM/MM Info Messages

IP.com Disclosure Number: IPCOM000131845D
Publication Date: 2005-Nov-21
Document File: 1 page(s) / 19K

Publishing Venue

The IP.com Prior Art Database

Abstract

The current 3GPP specification (GSM 2.42) doesn’t address the issue of determining the device time if the GMM and MM Information messages don’t carry any NITZ information or carry bogus information (i.e. the time zone is out side the –12 to +12 range or Year/Month/Day/Hour/Minute/Second/Time Zone is set to a non-integer value). If either of these case were detected, client devices would use the server time as the device time.

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NITZ TIME DETERMINATION SCHEME

Time Determination Scheme When NITZ Information Is Not carried by GMM/MM Info Messages

Disclosed Anonymously

The current 3GPP specification (GSM 2.42) doesn’t address the issue of determining the device time if the GMM and MM Information messages don’t carry any NITZ information or carry bogus information (i.e. the time zone is out side the –12 to +12 range or Year/Month/Day/Hour/Minute/Second/Time Zone is set to a non-integer value).  If either of these case were detected, client devices would use the server time as the device time.

Its important to note that the only reference in the standard to address this case is listed in 3GPP TS 03.40 (page 52), where it says that “if the MS received non-integer value in the Service-Centre-Time-Stamp, it shall assume that the digit is set to 0 but shall store the entire field exactly as received”.  This would cause a lot of confusion and discomfort to the user, who would not have access to the valid current time.  The problem could be even worse when he/she moves from a location (LA/RA) that has NITZ to one in which the NITZ data is not available.

The proposed solution lets the user request time by accessing the Date/Time options screen in certain mobile devices that support this. The following diagram is a time update scheme to account for networks that might not support NITZ or claims it supports NITZ, but carries invalid information.