Nec Corporation

Atsushi Nakata

Yoshio Ueda

Tomohiro Watanabe

Yasuhiko Matsunaga

Yoshinori Watanabe

Daisuke Ogura

Toshiyuki Sashihara

Tomu Tamura

Hiroaki Kuwano

Koichi Mochizuki

Rumi Kobayashi

In an architecture in which the inside of a radio access network is split into two layers and the processes are performed in separate apparatuses, respectively, to achieve the redundancy of the processes of the higher layer. A server apparatusis a communication apparatus that comprises a first layer processing unitconfigured to perform a process of a first layer in a radio access network, an establishing unitconfigured to perform a process for establishing connections with two or more clients performing a process of a second layer, which is higher than the first layer, an obtaining unitconfigured to obtain information related to a connection state with a first client performing the process of the second layer, and a communication processing unitconfigured to transmit, to a second client, the information related to the connection state with the first client.

Communication apparatus, method, program and recording medium

There is provided a communication apparatus that enables acquisition of data to be sent after a Secure Shell (SSH) connection between a wireless unit and a baseband unit is established. A communication apparatus () according to the present disclosure includes a communication unit () that establishes a first Secure Shell (SSH) connection with a wireless apparatus () that performs wireless communication with a communication terminal (), and establishes a second SSH connection with a control apparatus () that performs a baseband process related to a signal used in the wireless communication, and a data recording unit () that records data of a management plane received from the wireless apparatus () through the first SSH connection or the data of the management plane received from the control apparatus () through the second SSH connection.

Communication apparatus, data recording method, and non-transitory computer-readable medium

In order to solve the problem in which a flight vehicle flies only in locations having poor communication quality and retained data cannot necessarily reach the ground, this device communicates with a flight vehicle, wherein the device is provided with: a storage means that associates and stores first position information and a first communication rate at which it is possible to communicate at the position of the first position information; an extraction means that, upon receiving information that corresponds to a prescribed second communication rate at which the flight vehicle transmits data, extracts the first position information corresponding to the first communication rate equal to or greater than the second communication rate from the storage means; and an output means that outputs the first position information extracted by the extraction means to the flight vehicle, or outputs the inputted first position information to an instrument that notifies the flight vehicle.

Device, method, and medium for vehicle position and communication rate

A method of handover control, a relay apparatus, and a method for selecting a target cell are provided that make it possible to identify a target cell in a hand-in phase even in a network topology in which relay apparatuses are connected in multiple stages. In a radio communication system in which a base station controller () and a first relay apparatus () are connected to a communication network, wherein the base station controller has under its control at least one first base station () connected thereto, and the first relay apparatus has under its control at least a second relay apparatus () connected thereto, wherein the second relay apparatus has under its control at least one second base station (-) connected thereto, the first relay apparatus acquires cell information of a cell controlled by the second base station under the control of the second relay apparatus, and in a hand-in phase for handover from the first base station (), to which a radio station () is wirelessly connected, to the second base station (), the first relay apparatus identifies a target cell of the handover by using the cell information.

Method of handover control, relay apparatus, and method for selecting target cell in radio communication system

A communication apparatus according to the present invention is applied to a communication apparatus in a wireless communication system including a terminal, a first base station forming a first cell, and a second base station forming a second cell adjacent to the first cell. The communication apparatus includes: a communication status acquisition unit that acquires a communication status in the second base station; and a control unit that eliminates cell identifier duplication between a cell identifier of the second cell and a cell identifier of another cell based on the number of times that the second base station has received, from the terminal, a first message requesting for re-establishment of an RRC connection.

Communication apparatus, wireless communication system and communication method

A wireless communication system includes a first NodeB that forms a cell; and a relay apparatus to which the first NodeB connects and which relays data transmitted and received between the first NodeB and a core network. The first NodeB broadcasts identification information on the relay apparatus to which the first NodeB connects.

Wireless communication system in which NodeB broadcasts identification information on relay apparatus

[Problem] To provide a wireless base station, a traffic load-balancing method, and a traffic load-balancing program that make it possible to more reliably avoid backhaul congestion and decreases in wireless-terminal throughput. [Solution] This wireless base station includes the following: a setting unit () that sets network load information that indicates the traffic load on a backhaul between the wireless base station and a core network; and an execution unit () that, on the basis of the network load information set by the setting unit and network load information received from a neighboring wireless base station, executes a process that balances the traffic load between the wireless base stations.

Wireless base station, traffic load-balancing method, and storage medium with program stored thereon

A radio communication system includes a relay apparatus () connected between a base station () and a base control station () and a location information control station (), in which: the location information control station () includes: a request generation unit () for generating a location information request including regional information of a region for which the location information is requested; and a request transmission unit () for transmitting the location information request that has been generated to the base control station (), and the base control station () includes: a request reception unit () for receiving the location information request transmitted from the location information control station (); and a request transmission unit () for transmitting the location information request including the regional information in the location information request that has been received to the relay apparatus (). It is therefore possible to accurately transmit the location information request.

Radio communication system, radio communication method, base control station, and relay apparatus

An apparatus () used in a Self-Organizing Network (SON) includes a SON execution unit () and an exclusion processing unit (). The SON execution unit () executes a SON operation on a first cell (), a second cell () or a neighboring cell pair (and), the SON operation including repeatedly adjusting a configuration parameter that affects an operation of a base station () or a mobile station () to achieve an optimization objective. The exclusion processing unit () excludes the first cell (), the second cell () or the neighboring cell pair (and) from a future SON operation by the SON execution unit (), if achievement status of the optimization objective after completion of the SON operation by the SON execution unit () does not satisfy a predetermined reference level. This can contribute to suppression of execution of SON operation providing only little performance improvement.

Apparatus, method, and non-transitory computer readable medium for self-organizing network

A base station (), which is connected to a gateway device (), comprising: a transmission unit () that transmits an Old Transport Info to the gateway device, and the Old Transport Info is an information which is not used by the gateway device when a handover occurs.

Communication system, base station, gateway device, base station control method, and gateway device control method

A communication control method includes: transmitting, by a second radio base station () adjacent to a first radio base station (), an attribute value relating to a second cell () under control of the second radio base station () to the first radio base station; receiving, by the first radio base station, the attribute value relating to the second cell; comparing, by the first radio base station, the attribute value relating to the second cell with an attribute value relating to a first cell under control of the first radio base station; and executing, by the first radio base station, processing for matching the attribute value relating to the second cell with the attribute value relating to the first cell in accordance with a predetermined criterion when the received attribute value relating to the second cell is different from the attribute value relating to the first cell.

Communication control method, radio communication system, radio base station, and non-transitory computer readable medium

An increase in communication load in a network due to increasing messages for requesting information is suppressed. When a message for requesting information and a response message thereto are sent and received between a communication device (N-Nn) that is an information requester and an information provider (Nx) on a network (NW) via a communication device (), the communication device () stores the information acquired from the response message in a response information storage section (), and when any communication device requests at least part of the same information, a control section () creates a response message including the requested information and responds.

Communication system, gateway device, and communication control method

When one base station forms a plurality of cells that use different frequency bands, a handover caused by movement between cells can be successfully performed with a high probability. A radio base station adapted to communicate with a radio communication terminal, comprising: a communication unit which performs a first communication with the radio communication terminal by using a first frequency, wherein the communication unit performs a second communication with the communication terminal by using a second frequency that is different from the first frequency; and a controller which performs a control, of at least one of a first power of the first communication and a second power of the second communication, based on a first power-related quality of the first communication and a second power-related quality of the second communication.

Radio communication system, radio base station, radio communication terminal, radio communication method, and a non-transitory computer readable medium embodying instructions for controlling a device to implement a control method

A disclosed base station gateway apparatus has a C-plane processing unit and a U-plane processing unit. When a mobile station performs handover from a subordinate source base station to a subordinate target base station, the C-plane processing unit terminates S1AP signaling received from the source base station and the target base station without relaying the S1AP signaling to a mobility management apparatus. The U-plane processing unit inserts, into U-plane data that is received from a serving gateway apparatus and that is to be transferred to the source base station, an end marker indicating that the U-plane data is the last data at a predetermined timing, and switches the transfer destination of the U-plane data, received from the serving gateway apparatus, from the source base station to the target base station at a timing immediately after the end marker is inserted.

Growing community of inventors

Tokyo, Japan

Atsushi Nakata