Radio communication method, radio mobile device and radio base station accommodation apparatus

Abstract

In a radio communication system in which sequence numbers of radio packets transmitted to first and second radio base stations are managed independently to perform hand-off, when the hand-off is performed while a plurality of fragmented radio packets are transmitted, a mobile device applies sequence numbers of radio packets managed by the first radio base station after the hand-off is performed and applies sequence numbers of radio packets managed by the second radio base station after completion of transmission of the plurality of radio packets. The radio base station managing radio packets is identified on the basis of the sequence numbers managed in each base station upon restoration and data is restored.

1 . A radio communication method in a radio communication system including at least one radio mobile device, a plurality of radio base stations and a radio base station accommodation apparatus to accommodate them and in which when hand-off of the radio mobile device is performed from a first radio base station to a second radio base station, sequence numbers of radio packets transmitted to the first radio base station and sequence numbers of radio packets transmitted to the second radio base station are managed independently, comprising:
 making the radio mobile device control to apply, when the hand-off is performed while the radio mobile device subjects transmission data to fragmentation to divide the transmission data into a plurality of radio packets and transmits the plurality of radio packets, sequence numbers of radio packets managed by the first radio base station to the plurality of fragmented radio packets even after the hand-off is performed and to apply sequence numbers of radio packets managed by the second radio base station to data transmitted subsequently after completion of transmission of the plurality of fragmented radio packets; and   making the radio base station accommodation apparatus identify a radio base station managing radio packets on the basis of the sequence numbers managed in each radio base station and restore data for each radio base station.   
     
     
         2 . A radio communication method according to  claim 1 , wherein
 the hand-off is performed by a method using Route Selection Protocol (RSP).   
     
     
         3 . A radio communication method according to  claim 2 , wherein
 management of the sequence numbers of radio packets in the radio base station is performed using Radio Link Protocol (RLP).   
     
     
         4 . A radio mobile device in a radio communication system including at least one radio mobile device, a plurality of radio base stations and a radio base station accommodation apparatus to accommodate them and in which when hand-off of the radio mobile device is performed from a first radio base station to a second radio base station, sequence numbers of radio packets transmitted to the first radio base station and sequence numbers of radio packets transmitted to the second radio base station are managed independently, comprising:
 a radio transmitter-receiver part, a modulator-demodulator circuit, a control part and a memory part;   the control part controlling to apply, when the hand-off is performed while transmission data is subjected to fragmentation to be divided into a plurality of radio packets and the plurality of radio packets are transmitted, sequence numbers of radio packets managed by the first radio base station to the plurality of fragmented radio packets even after the hand-off is performed and to apply sequence numbers of radio packets managed by the second radio base station to data transmitted subsequently after completion of transmission of the plurality of fragmented radio packets.   
     
     
         5 . A radio mobile device according to  claim 4 , wherein
 the hand-off is performed by a method using Route Selection Protocol (RSP).   
     
     
         6 . A radio mobile device according to  claim 5 , wherein
 management of the sequence numbers of radio packets in the radio base station is performed using Radio Link Protocol (RLP).   
     
     
         7 . A radio base station accommodation apparatus in a radio communication system including at least one radio mobile device, a plurality of radio base stations and a radio base station accommodation apparatus to accommodate them and in which when hand-off of the radio mobile device is performed from a first radio base station to a second radio base station, sequence numbers of radio packets transmitted to the first radio base station and sequence numbers of radio packets transmitted to the second radio base station are managed independently, comprising:
 a communication interface, a control part and a memory part;   the control part identifying a radio base station managing radio packets on the basis of the sequence numbers managed independently and restoring data for each radio base station.   
     
     
         8 . A radio base station accommodation apparatus according to  claim 7 , wherein
 the hand-off is performed by a method using Route Selection Protocol (RSP).   
     
     
         9 . A radio base station accommodation apparatus according to  claim 8 , wherein
 management of the sequence numbers of radio packets in the radio base station is performed using Radio Link Protocol (RLP).