Method and system for calculating a local time for a user equipment in an intelligent network

A method, in an Intelligent Network (IN), of calculating local time of a subscriber's User Equipment (UE), the method comprising the steps of:

• determining whether a call terminates with the UE in a Problem Area cell site, which is a cell site having a time difference between the UE and the UE's serving Visitor Location Register (VLR), wherein if the cell site is a Problem area cell site or if the UE is not in a Problem Area cell site but there is a time difference between the VLR and the Gateway Mobile Switching Center (GMSC) handling the call:
• determining the UTC offset and DST observance indicator for the subscriber's location by using either
• a Coordinated Universal Time (UTC) offset and a Daylight Saving Time (DST) observance indicator for the Problem Area cell site or,
• a UTC offset and DST observance indicator for the VLR serving the UE;
• determining a time zone delta by comparing the subscriber's UTC offset and the GMSC's UTC offset;
• and
• if DST is in effect and there is a DST difference between the GMSC and the subscriber's location, applying a DST delta to call time of day.

A system, in an Intelligent Network (IN), for calculating local time of a subscriber's User Equipment (UE), the method comprising:

• a means for determining whether a call from the UE originates in a Problem Area cell site, which is a cell site having a time difference between the UE and the UE's serving Mobile Switching Center (MSC), wherein if the cell cite is a Problem area cell site:
• one of a Service Control Point or Service Data Point, for checking for Cell Global Identification (CGI), wherein the CGI is used to lookup:
• a Coordinated Universal Time (UTC) offset and a Daylight Saving Time (DST) observance indicator for the Problem Area cell site;
• determining a time zone delta by comparing the serving MSC's UTC offset and the CGI's UTC offset;
• and
• if DST is in effect and there is a DST difference between the serving MSC and the Problem Area cell site associated with the UE, a DST delta is applied to call time of day.

A system, in an Intelligent Network (IN), for calculating local time of a subscriber's User Equipment (UE), the method comprising the steps of:

• a means for determining whether the UE is in a Problem Area cell site, which is a cell site having a time difference between the UE and the UE's serving Mobile Switching Center (MSC), wherein if the cell cite is a Problem area cell site:
• one of a Service Control Point or Service Data Point, if the call terminates with the UE, checking for Cell Global Identification (CGI), and using the CGI to lookup a Coordinated Universal Time (UTC) offset and a Daylight Saving Time (DST) observance indicator for the Problem Area cell site;
• a means for determining a time zone delta by comparing the subscriber's UTC offset and the CGI's UTC offset;
• and
• if DST is in effect and there is a DST difference between the serving MSC and the Problem Area cell site associated with the UE, a means for applying a DST delta to call time of day.