| 摘要 |
PURPOSE:To attain priority transfer by controlling an exchange so as to apply priority transmission when a packet of call request designating priority transfer of the packet from a terminal device and the data packet is received to a logical channel relating to the packet. CONSTITUTION:When a terminal device 5A applying priority transfer designation makes call request similarly to a terminal device 5C to start a packet exchange 2A, a call request packet CR is sent. The priority transfer facility of the packet CR represents the priority transfer designation. The exchange 2A stores the information to a storage device 3A. The information is used to identify the processing of the priority transfer as to a packet relating to the said logical channel. The packet CR is sent to the exchange 2C via an exchange 2B, where the packet is converted into an incoming packet and reaches the terminal 5C.
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