Ntt Docomo, Inc.

Tomoki Shibahara

Masayoshi Shimizu

Atsushi Minokuchi

Takuya Shimojou

Itsuma Tanaka

Takashi Koshimizu

Malla Reddy Sama

Srisakul Thakolsri

Wolfgang Kiess

Keisuke Suzuki

Takashi Morita

Ashiq Khan

Takatoshi Okagawa

Masahiro Sawada

Shin-Ichi Isobe

Joan Triay Marques

Ryohei Ohgushi

Kazuaki Obana

A slice management system () is a slice management system managing slices that are virtual networks generated on a network infrastructure, comprises a memory storing a priority list in which slices of connection destination candidates of a UE () are aligned in order of priority levels and, in a case in which a connection request for a slice from the UE () is acquired, determines a slice to which UE () is to be connected on the basis of the priority list stored in the memory.

Slice management system and slice management method

An SGW-C acquires correlation information in advance and retrieves an SGW-U corresponding to a tracking area of a movement destination of UE with reference to the correlation information. An MME issues a request for connection between the SGW-U retrieved by the SGW-C and an eNB. In this way, since the correlation information in which SGW-Us and tracking areas are correlated with each other is stored, it is possible to appropriately change a tracking area even in a situation in which a control plane and a user plane are separated.

Communication control method and communication system for changing a tracking area when a control plane and user plane are separated

A correspondence information storageacquires correspondence information in which an eNB, an SGW-C, and an SGW-Uare associated with each other in advance, and a connection controllerreceives a handover request from the eNBand identifies a target eNBand a source eNB. A connection changeridentifies the SGW-Cand the SGW-Uassociated with the target eNBand identifies the SGW-Cand the SGW-Uassociated with the source eNB, with reference to the correspondence information. The connection changerdetermines whether or not the SGW-Cand the SGW-Uare to be changed on the basis of the identified result, and controls change requests for at least one of the SGW-Cand the SGW-Uon the basis of a result of the determination.

Gateway change method

When congestion is detected in an S-GW, communications are allowed to continue as many as possible. A mobile communication method according to the present invention includes: notifying, by the S-GW, a PDF in a PCRF of detection of congestion when the congest is detected; acquiring, by the PDF in the PCRF, charging system information regarding UEs using an S1 bearer and an S5 bearer set in the S-GW from an HSS; acquiring, by the PDF in the PCRF, communication service class information in a flow unit in the S1 bearer and the S5 bearer from the P-GW according to the notification; and performing, by the PDF in the PCRF, bandwidth adjustment on specific flows of the S1 bearer and the S5 bearer based on the charging system information and the communication service class information in the flow unit.

Mobile communication method, policy and charging rule server apparatus, and mobile management node

Even if a failure has occurred in core network equipment in a state in which bearers are established between a large number of UEs and a packet data network, congestion in the network is avoided. A mobile communication method according to the present invention includes steps of transmitting, by an MME, to transmit a 'PDN Disconnection Request/Detach Request' including barring time to a UE when the MME disconnects a bearer between the UE and the packet data network due to a predetermined reason such as a failure in a S-GW/P-GW or the MME in a state in which the bearer is established, and barring, by the UE, a mobile originating call directed to the packet data network for the barring time.

Mobile communication method, mobility management node, packet switch, and mobile station

When congestion in an eNB is detected, effective utilization of resources is achieved by adjusting not only a data flow rate in an EPS-RAB but also a band of a core network bearer corresponding with the EPS-RAB. A mobile communication method according to an embodiment includes a step A of causing an eNB to notify an MME of a cause of congestion and identifier information of the EPS-RAB involved in the congestion, when the eNB detects the congestion.

Mobile communication method, mobile communication system and radio base station

Growing community of inventors

Chiyoda-ku, Japan

Tomoki Shibahara