Apparatus and a method for controlling a priority access and channel assignment call in a mobile telecommunication system

Abstract

Disclosed is a method for controlling a PACA call in a mobile telecommunications system, which comprises: sending a new origination message from a mobile station in a PACA state to a base station; sending a service request message for a PACA call from the base station to a mobile switching center, requesting from the mobile switching center the base station to assign a traffic channel to the mobile station; assigning an available traffic channel to the mobile station to start a communication; and distinguishing the PACA call service from an ordinary call service.

What is claimed is:  
     
         1 . A method for controlling a priority access and channel assignment (PACA) call in a mobile telecommunication system, the method comprising: 
 sending a new origination message from a mobile station in a PACA state to a base station;    sending a service request message for the PACA call from the base station to a mobile switching center;    requesting from the mobile switching center that the base station assign a traffic channel to the mobile station;    assigning an available traffic channel to the mobile station to start a communication; and    distinguishing the PACA call service from an ordinary call service.    
     
     
         2 . A method as defined in    claim 1   , wherein the new origination message includes a parameter for indicating that that the PACA call is requested again.  
     
     
         3 . A method as defined in    claim 1   , wherein the available traffic channel is assigned to the mobile station to start a communication by the base station.  
     
     
         4 . A method as defined in    claim 1   , wherein the PACA call service is distinguished from the ordinary call service by the mobile switching center.  
     
     
         5 . A method for controlling a PACA call in a mobile telecommunication system, the method comprising: 
 determining whether or not an origination message from a mobile station for the PACA call has the same subscriber's registered location as the subscriber's registered location in a visitor location register (VLR);    determining that the mobile station has been handed off from a previous base station to a new base station if the subscriber's registered location of the origination message is not the same as that of the VLR;    sending a first PACA call update message to the previous base station; and    deleting the first PACA call information from the previous base station.    
     
     
         6 . A method as defined in    claim 5   , wherein the deleted first PACA call information is stored in a PACA call buffer of the previous base station.  
     
     
         7 . A method as defined in    claim 5   , wherein the subscriber's location registered in the VLR is registered when the mobile station is shifted to a PACA state after sending the origination message.  
     
     
         8 . A method as defined in    claim 5   , wherein the origination message is determined as the PACA call by detecting a parameter representing the PACA call.  
     
     
         9 . A method as defined in    claim 8   , further comprising: 
 determining whether the mobile station is in the PACA state or not, if the subscriber's registered location of the origination message does not agree with that of the VLR;    determining whether a cell ID of the origination message agrees with the origination message registered in the VLR if the mobile station is in the PACA state;    determining that the mobile station has sent a new origination message in the PACA state if the cell ID of the origination message agrees with that registered in the VLR;    sending a second PACA call update message to the previous base station; and    deleting the second PACA call information from the previous base station.    
     
     
         10 . A method as defined in    claim 9   , wherein the PACA call deleted from the base station is previously stored in the PACA call buffer of the base station.  
     
     
         11 . A method for controlling a PACA call in a mobile telecommunication system, the method comprising: 
 sending a PACA call cancel message from a mobile station in a PACA state to a base station;    sending a PACA call update message from the base station to a mobile switching center; and    sending a mobile station PACA CALL update message from the mobile switching center to the VLR.    
     
     
         12 . A method as defined in    claim 11   , further comprising deleting the PACA call update message from the mobile station.  
     
     
         13 . A method for controlling a PACA call in a mobile telecommunication system, the method comprising: 
 analyzing information from a receiving subscriber toward which a call signal is directed; and    canceling the call signal when a mobile station of the receiving subscriber is in a PACA state.    
     
     
         14 . A method as defined in    claim 13   , further comprising sending a busy tone to a sending subscriber who has generated the call signal.  
     
     
         15 . A method as defined in    claim 13   , further comprising sending a call message to the mobile station of the receiving subscriber when it is not in the PACA state.  
     
     
         16 . A system for controlling a priority access and channel assignment (PACA) call in a mobile telecommunication system, the system comprising: 
 a mobile station configured to send a new origination message in a PACA state to a base station;    the base station configured to send a service request message for the PACA call to a mobile switching center;    the mobile switching center configured to request the base station to assign a traffic channel to the mobile station;    the base station further configured to assign an available traffic channel to the mobile station to start a communication; and    the mobile switching center further configured to distinguish the PACA call from an ordinary call service.    
     
     
         17 . An apparatus for controlling a priority access and channel assignment (PACA) call in a mobile telecommunication system, the apparatus comprising: 
 a mobile switching center configured to distinguish a PACA call from an ordinary call service.