Method and system for mobile communications

Abstract

When a network pages the temporary user mobile identifier of a mobile station, the mobile station sends a response to the network. Next, the network checks the authenticity of the user using a ciphering key, corresponding to the temporary user mobile identifier and a random number. If the temporary user mobile identifier is authenticated, a normal incoming call acceptance procedure is executed. If the mobile station is authenticated although the temporary user mobile identifier is wrong, the network reassigns a new temporary user mobile identifier to the mobile station and stops the current communication. In communication, the network and the mobile station mutually notify encipherment-onset time and negotiate about encipherment manner with each other. In addition, diversity handover is commenced upon a call attempt. Furthermore, if a branch replacement is necessary, the current branch is replaced by new branches capable of executing the diversity handover. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, the mobile station uses the same branch structure and the same communication frequency band for all of calls. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, a branch structure and a communication frequency band, which can continue all of the calls, are selected and used. Therefore, the mobile communications system is suitable for transmission of various sorts of data in accordance with the development of multimedia.

1 - 53 . (canceled)  
   
   
       54 . A method for controlling a branch replacement characterized in that at least a current branch between a network and a mobile station are replaced with a plurality of branches necessary for communication using diversity handover when the branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating using diversity handover if the branch replacement is carried out, thereby enabling the mobile station to commence diversity handover.  
   
   
       55 . A method according to  claim 54 , wherein the network additionally establishes an auxiliary branch for the mobile station, and then releases the current branch, so as to complete the branch replacement for communicating using diversity handover.  
   
   
       56 . A mobile station characterized in that it replaces at least a current branch between a network and the mobile station with a plurality of branches necessary for communication using diversity handover when a branch replacement is necessary for the mobile station and when the mobile station can commence communicating using the diversity handover branches if the branch replacement is carried out, thereby commencing diversity handover.  
   
   
       57 . A base station controller characterized in that it replaces at least a current branch between a network and a mobile station with a plurality of branches necessary for communication using diversity handover when a branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating using diversity handover if the branch replacement is carried out, thereby enabling the mobile station to commence diversity handover.  
   
   
       58 . A base station controller characterized in that it transmits a message to abase station and a mobile station when a branch replacement is necessary for the mobile station and when it is recognized that, if the branch replacement is carried out, the mobile station can commence communicating by means of intra-cell diversity handover wherein the mobile station and the base station communicate with each other using a plurality of branches, the message including an instruction to carry out the branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover.  
   
   
       59 . A base station controller characterized in that it transmits an instruction to a plurality of base stations and a message to a mobile station when a branch replacement is necessary for the mobile station and when it is recognized that the mobile station can commence communicating by means of inter-cell diversity handover if the branch replacement is carried out, the instruction instructing the base stations to set branches necessary for the diversity handover, the message including an instruction to carry out the branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover.  
   
   
       60 . A base station characterized in that it replaces a branch for a mobile station and adds at least one auxiliary branch for the mobile station according to instructions of a message once the base station receives the message from a base station controller, the message including an instruction to carry out branch replacement and an instruction to add at least one auxiliary branch for additional use in order to communicate using diversity handover, thereby commencing the intra-cell diversity handover.  
   
   
       61 . A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls is controlled, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.  
   
   
       62 . A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the a branch structure and a communication frequency band, being the same as those for the existent call, are assigned to the new call.  
   
   
       63 . A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the mobile station uses a branch structure and a communication frequency band, being the same as those for the existent call, for the new call in accordance with an instruction from a network.  
   
   
       64 . A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller controls at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.  
   
   
       65 . A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller assigns a branch structure and a communication frequency band, being the same as that for the existent call, to the new call.  
   
   
       66 . A branch controlling method adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, another branch structure or another communication frequency band which can continue both of the existent and new calls is selected, and the selected branch structure or communication frequency band is assigned to both of the existent and new calls.  
   
   
       67 . A method according to  claim 61 , wherein the existent call is assigned to diversity handover branches and the new call is also assigned to the same diversity handover branches if possible.  
   
   
       68 . A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the mobile station assigns another branch structure or another communication frequency band, which can continue both of the existent and new calls, to both of the existent and new calls in accordance with an instruction from a network.  
   
   
       69 . A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the base station controller selects another branch structure or another communication frequency band which can continue both of the existent and new calls, and assigns the selected branch structure or communication frequency band to both of the existent and new calls.  
   
   
       70 . A branch controlling method adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, a branch structure or a communication frequency band which can continue all of the calls is selected, and the selected branch structure or communication frequency band is assigned to all of the calls commonly.  
   
   
       71 . A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, the mobile station, according to an instruction from a network, alters a branch structure or a communication frequency band for all of the calls to a new branch structure or a new communication frequency band for all of the calls commonly.  
   
   
       72 . A base station controller adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls, the base station controller selects a branch structure or a communication frequency band which can continue all of the calls, and assigns the selected branch structure or communication frequency band to all of the calls commonly.  
   
   
       73 . A branch controlling method adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or when there is not a communication frequency band which can continue all of the calls in relation to the mobile station, another branch structure or another communication frequency band which can continue a plurality of calls being high in priority among the calls are selected; the other call or calls are released; and the selected branch structure and communication frequency band are assigned to the priority calls.  
   
   
       74 . A mobile station characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or when there is not a communication frequency band which can continue all of the calls in relation to the mobile station, the mobile station, according to an instruction from a network, releases a call or calls being low in priority; and assigns a branch structure and a communication frequency band selected by the network to a plurality of calls being high in priority.  
   
   
       75 . A base station controller adapted for a mobile station, characterized in that when a trigger of handover occurs to the mobile station which is treating a plurality of calls and when there is not a branch structure which can continue all of the calls in relation to the mobile station or there is not a communication frequency band which can continue all of the calls in relation to the mobile station, the base station controller selects another branch structure and another communication frequency band which can continue a plurality of calls being high in priority among the calls; releases the other call or calls; and assigns the selected branch structure and communication frequency band to the priority calls.  
   
   
       76 - 81 . (canceled)  
   
   
       82 . A handover controlling method for additionally establishing a handover branch between a mobile station and a network, characterized in that a procedure for additional establishment of a branch is completed with a state transition to which the mobile station can commence communicating without waiting for a confirmation of synchronization for all branches.  
   
   
       83 . A handover controlling method according to  claim 82 , wherein the procedure for additional branch establishment is completed with confirmation of synchronization for one branch among the branches established for the mobile station.  
   
   
       84 . A mobile station characterized in that if the mobile station has received a request from a network to establish a new additional branch between the network and the mobile station, the mobile station establishes the new branch and then starts diversity reception upon reception of a signal through the new branch.  
   
   
       85 . A base station characterized in that if the base station has received a request from a base station controller to establish a new additional branch between a mobile station and the base station for carrying out intra-cell diversity handover, the base station additionally establishes the new branch and then starts intra-cell diversity reception upon reception of a signal through the new branch.  
   
   
       86 . A base station characterized in that if the base station has received a request from a base station controller to establish a new additional branch between a mobile station and the base station for carrying out inter-cell diversity handover, the base station establishes the new branch and then starts sending the received signals to the base station controller that executes inter-cell diversity reception upon reception of a signal through the new branch.  
   
   
       87 . A base station controller characterized in that when the base station controller establishes a new additional branch between a mobile station and a network, the base station controller provides a request for establishing the new branch and then completes a procedure for additional establishment of the new branch without a confirmation of synchronization for all branches between the mobile station and the network.  
   
   
       88 . A base station controller according to  claim 87 , wherein the base station controller provides the request for establishing the new branch being necessary for inter-cell diversity handover, and then starts inter-cell diversity reception upon reception of signals through the branches being necessary for inter-cell diversity handover.  
   
   
       89 - 99 . (canceled)