Call processing method capable of home-zone additional services in mobile communication system

A call processing method in a mobile communication system which includes an origination MSC, an origination VLR, an origination HLR, a target MSC and a target HLR, the method comprising the steps of:

• a) receiving a number of the called subscriber from a calling subscriber;
• b) in the origination MSC, receiving location information and the number of called subscriber;
• c) in the origination MSC, reading and analyzing the calling subscriber information stored in the origination VLR;
• d) in the origination MSC, determining whether the calling subscriber is a home-zone service subscriber;
• e) if the calling subscriber is a home-zone service subscriber, transmitting present location information of the calling subscriber to the origination HLR, from the origination MSC;
• f) in the origination HLR, determining whether the present location of the calling subscriber is within a pre-registered area;
• g) if the calling subscriber is within the pre-registered area, applying the origination MSC a discount in accounting according to home-zone service to the accounting information;
• h) in the origination MSC, performing a call setup operation in order to allow conversation between the calling subscriber and the called subscriber,
• i) if the present location of the calling subscriber is within a pre-registered area transmitting from the origination HLR announcement comment for the home-zone service or a tone code to the mobile station;
• and
• j) if the calling subscriber is not a home-zone subscriber or the present location of the calling subscriber is not pre-registered area, in the origination MSC, a call setup operation in order to allow conversation between the calling subscriber and the called subscriber without discount, wherein the step j) includes the steps of:
• j1) determining in the origination MSC if the calling subscriber is call restricted subscriber;
• j2) if it is determined that the calling subscriber is not a call restricted subscriber, determining in the origination MSC if the number of the called subscriber inputted by the calling subscriber is a mobile subscriber number;
• j3) if the number of the called subscriber inputted by the calling subscriber is a mobile subscriber number, at the origination MSC, requesting the routing information about the called subscriber from the target HLR;
• j4) transmitting from the target HLR the routing information about the called subscriber to the origination MSC;
• j5) upon analyzing the routing information about the called subscriber, determining in the origination MSC whether the target MSC exists to which the called subscriber belongs;
• and
• j6) if it is determined that the target MSC for the called subscriber exists, setting up in the origination MSC a call to the target MSC allowing the calling subscriber and the called subscriber to proceed a conversation between them.