Nippon Telegraph and Telephone Corporation

Nippon Telegraph & Telephone Corporation of Japan

Noriyuki Oota

Hirotaka Ujikawa

Noriki Miki

Kenichi Suzuki

Daisuke Murayama

Manabu Yoshino

Kota Asaka

Takumi Harada

Osamu Yoshihara

A communication processing device including: a memory that stores data relating to a pre-update firmware, and second data relating to a post-update firmware, and that stores first reference destination address indicating the storage area of reference destination included in the first data in association with the reference destination; a rewriting unit configured to rewrite at least some of the first reference destination address stored in the memory with second reference destination address indicating the storage area of the reference destination in the second data; and a control unit configured to, when referring to the reference destination in the first data, refer to the second data on the basis of the second reference destination address stored in the memory.

Communication processing device, information processing device, and communication processing device control method

A virtual subscriber line terminal station device includes a software component including software to be added in accordance with a service requirement; and hardware having general-purpose functions; wherein the hardware includes a communication unit that receives a bandwidth allocation request transmitted by a subscriber line termination device; and the software component includes a bandwidth allocation component. The bandwidth allocation component has an individual unit that, based on an algorithm for allocating bands, computes a bandwidth to be allocated to the subscriber line termination device that transmitted the bandwidth allocation request; a common unit that, in accordance with the bandwidth allocated by the individual unit, allocates the bandwidth to the subscriber line termination device; and an interface between the individual unit and the common unit. The common unit converts the bandwidth allocation request received by the communication unit to a format that can be used by the individual unit. The individual unit computes the bandwidth to be allocated to the subscriber line termination device that transmitted the bandwidth allocation request that is converted, by the common unit, to a format that can be used by the individual unit.

Virtual subscriber line terminal station device and control method for virtual subscriber line terminal station device

An optical line terminal calculates a requirement threshold for each optical subscriber unit based on a difference between the time average allocated bandwidth of each optical subscriber unit and the target bandwidth, and notifies a corresponding optical subscriber unit of the calculated requirement threshold. The corresponding optical subscriber unit then notifies, based on the data amount accumulated in a buffer, the optical line terminal of a data amount, as a transmission requirement, up to a data separation that is less or equal to the notified requirement threshold and in which a maximum transmission amount can be transmitted. The optical line terminal then notifies the corresponding optical subscriber unit of a transmission permission amount in which the data equal to the transmission requirement of which the optical line terminal is notified can be transmitted. The corresponding optical subscriber unit then transmits the data amount corresponding to the transmission permission amount.

Bandwidth allocation method and passive optical network system

In a P2MP system in which upstream bandwidth is shared by a plurality of ONUs, a dynamic bandwidth allocation circuit is provided which reduces the consumption of memory capacity, and avoids the divergence of parameters. A dynamic bandwidth allocation circuit provided in an optical line terminal (OLT) calculates, for each cycle and for each ONU, a target data size (target) which constitutes a target for allocated data size (allocated). Furthermore, taking the time constant of an exponential weighted moving average as &#x3c4;, and taking &#x3b1;=(&#x3c4;&#x2212;1)/(&#x3c4;+1), an ideal allocated data size (ideal) is calculated by ideal=target&#x2212;(&#x3b1;/(1&#x2212;&#x3b1;))&#xb7;excess. Furthermore, an excess allocated data size (excess) per one cycle is calculated by excess=&#x3b1;&#xb7;excess+(1&#x2212;&#x3b1;)&#xb7;(allocated&#x2212;target). If ideal&#x3c;0, the condition that bandwidth allocation is not granted is used for bandwidth allocation.

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Yokosuka, Japan

Noriyuki Oota