Nec Corporation

Nec C Orporation

Lenovo Innovations Limited (hong Kong)

Jinsock Lee

Kojiro Hamabe

Hisashi Futaki

Hiroaki Aminaka

Nahoko Kuroda

Naoto Ishii

Kojirou Hamabe

Yoshikazu Kakura

Kenji Koyanagi

Mayu Takeshita

Akihisa Ushirokawa

Takahiro Nobukiyo

Koujirou Hamabe

Akihisa c/o Nec Corporation Ushirokawa

A radio communication system provided with a communication device and a radio communication network system is characterized by comprising a transmission delay estimate information transmitting means for transmitting transmission delay estimate information to the radio communication network system when the transmission condition of the transmission delay estimate information is met.

Radio communication system, communication apparatus, radio communication network system and method therefor

A wireless communication system is provided for reducing the probability that latency before data transmission increases when a mobile station that is actually in sync is judged to be out of sync. A base station causes the timing calculation part to calculate the timing advance (TA) of a transmit timing from the mmobile station; causes the timer adaptive control part to obtain the traveling speed or the time variation in TA of the mmobile station and, adaptively determines and outputs as the timer update information the length of the mfirst timer within an M number in total of synchronization timers and the length of the second timer of the mmobile station and update the length of the mfirst timer; and transmits from the downlink transmission part a downlink signal which contains timer update information.

Wireless communication system, its base station and mobile station, communication synchronization management method and timer control program therefor

It is possible to solve the problem that a downstream control information amount is significantly increased if allocation information is periodically reported because no allocation method of a default E-DCH resource configuration is defined for a preamble signature. A base station and a mobile station decide a default resource configuration by using a total number of resource configurations or a value obtained from the total number.

Communication system, mobile station, base station, response decision method, resource configuration decision method, and program

Even when a radio terminal cannot receive content data from a base station to which the radio terminal serves, the radio terminal receives the content data from other base station. A wireless communication system () includes a plurality of radio base stations (to) and a radio terminal (). The radio terminal () serves to a specific radio base station (serving radio base station) among the radio base stations (to). Moreover, the radio terminal () receives content data which is broadcasted or multicasted from a non-serving radio base station among the radio base stations (to) according to a gap pattern.

System, terminal, base station, and methods for scheduling multimedia broadcast and multicast service reception

Provided is a mobile station which communicates with abase station using a radio channel, the mobile station comprising: a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted; a transmission unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal; a packet reception determination unit configured to determine a packet reception fault; and a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit.

Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them

Disclosed is a radio communication system in which transmission parameters, such as MCS of MBSFN, the number of subframes, and a transmission power of a reserved cell, are adaptively output, based on a unicast traffic volume in a MBSFN area, a number of terminals, and a number of cells of the MBSFN area, so that a system throughput in the MBSFN area is maximized while satisfying an MBSFN quality requirement condition.

Radio communication system, method, program, base station apparatus, multi-cell/multicast cooperation control apparatus

Provided is a mobile station which communicates with a base station using a radio channel, the mobile station comprising: a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted; a transmission unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal; a packet reception determination unit configured to determine a packet reception fault; and a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit.

A resource allocation method and device are provided that can achieve uniform loads on and stable quality of a common channel available to mobile stations having no dedicated channels. A method for allocating common channel resources in a system in which a plurality of first radio communication devices transmit data to a second radio communication device over a common channel, based on first resource allocation information, includes: by the second radio communication device, transmitting second resource allocation information to at least one of the first radio communication devices; and by each of the first radio communication devices, transmitting data to the second radio communication device over the common channel, based on any one of the first resource allocation information and the second resource allocation information.

Method and device for allocating common channel resources

A DRX control method and system includes receiving, from a source base station for transferring the UE from the source base station to a target base station, a plurality of configurations including: a first configuration of a first Discontinuous Reception (DRX) cycle, a second configuration of a second DRX cycle, and a first timer counting a period in the first DRX cycle to shift from the first DRX cycle to the second DRX cycle; performing, in a state of RRC Radio Resource Control (RRC) connected with the target base station, DRX operation with the first DRX cycle; and performing, in a state of RRC connected with the target base station, the DRX operation with the second DRX cycle when the UE does not receive data from the target base station until the first timer expires in the first DRX cycle.

Inter base station handover method, radio communication system, DRX control method, base station, and communication terminal

Even when a radio terminal cannot receive contents data from a serving base station, the radio terminal can receive the contents data from other base station. A wireless communication system includes a radio terminal, a serving radio base station to which the radio terminal serves, and a non-serving radio base station to which the radio terminal does not serve. The serving radio base station receives, from the non-serving radio base station, contents-related information concerning contents data to be broadcasted or multicasted by said non-serving radio base station, and transmits the received contents-related information to the radio terminal.

Growing community of inventors

Tokyo, Japan

Jinsock Lee