Home zone service method for mobile telephone subscribers in mobile radio communication system

A method for determining whether a subscriber is making a call connection within a home zone area using a predetermined home zone database, which includes a first round trip delay value and a second round trip delay value defining the home zone area for a mobile phone subscriber, and wherein a different charging rate is applied if a request for a call connection is made within the home zone area, the method comprising the steps of:

• (a) transmitting, by the mobile phone, an originating signal to a base station to establish a call connection;
• (b) upon receiving the originating signal, calculating a round trip delay (RTD) of the originating signal by the base station;
• (c) transmitting, by the base station, the calculated round trip delay and the originating signal to a mobile switching center;
• (d) determining, by the mobile switching center, whether the calculated round trip delay falls within a range between the first value and the second value associated with the mobile phone in the predetermined home zone database;
• and,
• (e) if the measured RTD value falls within the first value and the second value, allocating a communication channel to the mobile phone by the base station.

A method for determining whether a subscriber is making a call connection within a home zone area using a predetermined home zone database, which includes a first round trip delay value and a second round trip delay value defining the home zone area for a mobile phone subscriber, and wherein a different charging rate is applied if a request for a call connection is made within the home zone area, the method comprising the steps of:

• (a) transmitting, by the mobile phone subscriber, an originating signal to a base station to establish a call connection;
• (b) upon receiving the originating signal, calculating a round trip delay (RTD) of the originating signal by the base station;
• (c) transmitting, by the base station, the calculated round trip delay and the originating signal to a mobile switching center;
• (d) determining, by the mobile switching center, whether the calculated round trip delay falls within a range between the first value and the second value associated with the mobile phone subscriber in the predetermined home zone database;
• and,
• (e) if the calculated RTD value falls within the first value and the second value, transmitting a home zone identifying signal to the mobile phone subscriber by the mobile switching center.