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 of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the mobile communication system comprising:
 a forwarding controller that 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   the mobile station includes a receiver that receives the forwarded residual packet data.   
     
     
         2 . A forwarding method in a mobile communication system in which residual packet data of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the forwarding 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, on the mobile station, the forwarded residual packet data.   
     
     
         3 . A base station which is able to work as a handover source base station in a mobile communication system in which residual packet data of the handover source base station are forwarded to a handover destination base station in accordance with a handover procedure based on movement of a mobile station; the base station comprising:
 a transmitter that forwards the residual packet data to the handover destination base station; and   a controller that controls the transmitter in such a manner that the transmitter forwards the residual packet data after completion of a resource securement for a communication between the handover destination base station and the mobile station.   
     
     
         4 . A mobile communication system in which residual packet data of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the mobile communication system comprising:
 the first base station including:
 a processor that requests a resource securement to the second base station before the forwarding of the residual packet data; and 
 a transmitter that performs the forwarding of the residual packet data after completion of the resource securement; and 
   the mobile station includes:
 a receiver that receives the forwarded residual packet data. 
   
     
     
         5 . A forwarding method in a mobile communication system in which residual packet data of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the forwarding method comprising:
 requesting, on the first base station, a resource securement to the second base station before the forwarding of the residual packet data;   performing, on the first base station, the forwarding of the residual packet data after completion of the resource securement; and   receiving, on the mobile station, the forwarded residual packet data.   
     
     
         6 . A base station which is able to work as a handover source base station in a mobile communication system in which residual packet data of the handover source base station are forwarded to a handover destination base station in accordance with a handover procedure based on movement of a mobile station; the base station comprising:
 a processor that requests a resource securement to the handover destination base station before the forwarding of the residual packet data; and   a transmitter that performs the forwarding of the residual packet data after completion of the resource securement.   
     
     
         7 . A mobile communication system in which residual packet data of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the mobile communication system comprising:
 a retransmission controller that 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 notifying unit that notifies the retransmission controller of the first base station whether the residual packet data was transmitted to the mobile station; and   the mobile station includes a receiver which receives the forwarded residual packet data.   
     
     
         8 . A forwarding method in a mobile communication system in which residual packet data of a first base station are forwarded to a second base station in accordance with a handover procedure based on movement of a mobile station; the forwarding 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 the residual packet data was transmitted to the mobile station; and   receiving, on the mobile station, the forwarded residual packet data.   
     
     
         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 of a handover source base station are forwarded to the handover destination base station in accordance with a handover procedure based on movement of a mobile station; the base station comprising:
 a retransmission controller that performs retransmission control of the residual packet data to be transmitted via a radio communication link for the mobile station; and   a notifying unit that notifies the handover source base station whether the residual packet data was transmitted to the mobile station.