Nippon Telegraph and Telephone Corporation

Tsugumichi Shibata

Masami Urano

Sadayuki Yasuda

Tadao Takeda

Shoko Ohteru

Yasuyuki Itoh

Toshinori Fukunaga

Tomota Ieyasu

A write preference determination unit (A) compares a reception rate of packets received from the lines of a first network (NW) with a reception rate threshold for write preference determination, and in a case where the reception rate exceeds the reception rate threshold, determines that preference of a write operation is necessary. A write preference control unit (B) increases, out of a total access bandwidth of a packet buffer (BUF), a write bandwidth for a packet write operation to the packet buffer (BUF) as compared to a read bandwidth for a packet read operation from the packet buffer (BUF) in a case where the write preference determination unit (A) determines that the preference is necessary, thereby preferentially executing the packet write operation to the packet buffer. This suppresses occurrence of linked discard of reception packets caused by a shortage of the write bandwidth.

Packet transfer processing apparatus and method

A packet transfer processing device includes common processing units that perform processing common to inbound processing of a packet received from an access network for transfer to a core network and outbound processing of a packet received from the core network for transfer to the access network, an input destination switching unit that selects common processing units to which the received packets are to be input, an output destination switching unit that outputs packets processed by the common processing units to a destination network, an individual processing switching unit that selects a common processing unit to connect to an individual processing unit that performs individual processing not performed by the common processing units as part of inbound processing, and a control unit that controls the input destination switching unit, the individual processing switching unit, and switching supply/shutoff of power to the common processing units.

Packet transfer processing method and packet transfer processing device

A noncontact type IC card includes an electromagnetic induction coil, integrated circuit, and switch. The electromagnetic induction coil receives the energy of an electromagnetic field radiated from an external device. The integrated circuit can be operated by driving power supplied by the energy of the electromagnetic field. The switch is provided on the electromagnetic induction coil for receiving the energy of the electromagnetic field and switches the inductance of the electromagnetic induction coil.

Noncontact type IC card and system therefor

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Tokyo, Japan

Tsugumichi Shibata