Packet transferring/transmitting method and mobile communication system

Abstract

A packet transferring/transmitting method is provided for use in a mobile communication system 50 . In this packet transferring/transmitting method, an upper node 1 determines the implementation of handover (determination step), and a handover addressing node 2 transfers, of a plurality of packets, a non-transmitted residual packet to a handover addressed node 3 , and the upper node 1 transmits a new packet to the handover addressed node 3 (transfer/transmission step). This enables maintaining the number of users to be accommodated while securing a wide bandwidth, sharing a line with high efficiency at soft handover, avoiding data residual in the case of the employment of variable communication rate, and preventing an increase in retransmission.

1 . A mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the system comprising: 
 a controller which performs the forwarding of the residual packet data without performing an encapsulating for attaching a header for retransmission control to the residual packet data; and    a receiver configured to receive packet data transmitted from the second base station.    
   
   
       2 . The mobile communication system of  claim 1 , wherein the header includes a sequence number.  
   
   
       3 . A forwarding method in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the method comprising: 
 performing the forwarding of the residual packet data without performing an encapsulating for attaching a header for retransmission control to the residual packet data; and    receiving packet data transmitted from the second base station.    
   
   
       4 . The forwarding method of  claim 3 , wherein the header includes a sequence number.  
   
   
       5 . A base station which is able to work as a handover destination base station in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a handover source base station to the handover destination base station in accordance with a handover procedure with respect to the mobile station; the base station comprising: 
 a controller which performs the forwarding of the residual packet data without performing an encapsulating for attaching a header for retransmission control to the residual packet data.    
   
   
       6 . The base station of  claim 5 , wherein the header includes a sequence number.  
   
   
       7 . A mobile communication system in which residual packet data which have not been received by a mobile station are forward from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the system comprising: 
 a forwarding controller which performs the forwarding of the residual packet data after completion of a resource securement for a communication between the second base station and the mobile station; and    a receiver configured to receive packet data transmitted from the second base station.    
   
   
       8 . A forwarding method in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the method comprising: 
 performing the forwarding of the residual packet data after completion of a resource securement for a communication between the second base station and the mobile station; and    receiving packet data transmitted from the second base station.    
   
   
       9 . A base station which is able to work as a handover destination base station in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a handover source base station to the handover destination base station in accordance with a handover procedure with respect to the mobile station; the base station comprising: 
 a forwarding controller which performs the forwarding of the residual packet data after completion of a resource securement for a communication between the second base station and the mobile station.    
   
   
       10 . A mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the system comprising: 
 a processing unit which performs the forwarding of the residual packet data after completion of a resource securement by the first base station requesting the resource securement of the second base station; and    receives packet data transmitted from the second base station.    
   
   
       11 . A forwarding method in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the method comprising: 
 performing the forwarding of the residual packet data after completion of a resource securement by the first base station requesting the resource securement of the second base station; and    receiving packet data transmitted from the second base station.    
   
   
       12 . A base station which is able to work as a handover destination base station in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a handover source base station to the handover destination base station in accordance with a handover procedure with respect to the mobile station; the base station comprising: 
 a processing unit which request a resource securement of the second base station; and    performs the forwarding of the residual packet data after completion of a resource securement by the first base station.    
   
   
       13 . A mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the system comprising: 
 retransmission controller which performs retransmission control of the residual packet data to be transmitted via a radio communication link for the mobile station under control of the second base station;    a processing unit which notifies the first base station whether it is feasible to transmit the residual packet data to the mobile station; and    receives packet data transmitted from the second base station.    
   
   
       14 . A forwarding method in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a first base station to a second base station in accordance with a handover procedure with respect to the mobile station; the method comprising: 
 performing retransmission control of the residual packet data to be transmitted via a radio communication link for the mobile station under control of the second base station;    notifying the first base station whether it is feasible to transmit the residual packet data to the mobile station; and    receiving packet data transmitted from the second base station.    
   
   
       15 . A base station which is able to work as a handover destination base station in a mobile communication system in which residual packet data which have not been received by a mobile station are forwarded from a handover source base station to the handover destination base station in accordance with a base handover procedure with respect to the mobile station; the base station comprising: 
 retransmission controller which performs retransmission control of the residual packet data to be transmitted via a radio communication link for the mobile station under control of the second base station; and    a processing unit which notifies the first base station whether it is feasible to transmit the residual packet data to the mobile station.