Ntt Docomo, Inc.

Hideyuki Matsutani

Mikio Iwamura

Wuri Andarmawanti Hapsari

Kenichiro Aoyagi

Yuichiro Nakamura

Yasuhiro Kawabe

Kazunori Obata

Sadayuki Abeta

Yasuyuki Watanabe

Takahiro Hayashi

Yusuke Sasaki

Tetsuro Imai

Kouichi Morikawa

Hideo Matsuki

Kenji Fukazawa

During a transition procedure from a first communication system to a second communication system, when the priority of a second communication call, whose setup is requested, is the first priority, the second communication system does not set up the bearer of a first communication call between the second communication system and the mobile communication terminal, and notifies the first communication system that the setup of the first communication is not possible, but the setup of the second communication call is possible. When notified that the setup of the first communication is not possible, but the setup of the second communication call is possible, the first communication system aborts the handover procedure, and instructs the mobile communication terminal to switch to the second communication system by another procedure.

Mobile communication system, network device, and mobile communication method

A UEis connectable to a first radio communication system and a second radio communication system which differs from the first radio communication system and uses multiple frequency bands. The UEreceives RRC CONNECTION REJECT which gives an instruction to switch from the first radio communication system to the second radio communication system and an indication on multiple switching target frequencies included in the frequency bands used by the second radio communication system, and, if the multiple switching target frequencies include an unavailable frequency at which the UEis incapable of transmission/reception, searches for only a cell of a switching target frequency among the multiple switching target frequencies exclusive of the unavailable frequency.

Communication system, mobile station, and switching control method

A radio control apparatus determines a call type of a communication terminal, and transmits a release redirection control signal to the communication terminal. When the call type is a general call, the release redirection signal not including broadcast information is transmitted to the communication terminal. When the call type is an important communication call, the release redirection control signal including the broadcast information is transmitted to the communication terminal.

Radio control apparatus, connection destination switching method, and system

A controller in a mobile communication system includes a management unit () configured to manage a resource usage condition in the mobile communication system and a determination unit () configured to determine to which an idle state or a power saving state different from the idle state a user equipment () is to transition after completion of communication of a data signal depending on the resource usage condition, and the state determined by the determination unit () is indicated to the user equipment ().

Mobile communication system, controller and method

A communication device includes a network side communication unit that receives emergency information from an information broadcasting node; and a UE side communication unit that communicates a communication signal with user equipment (UE) through a radio base station. The UE side communication unit broadcasts a Secondary Notification signal including the emergency information, subsequent to broadcasting a Primary Notification signal providing notice of broadcasting of the emergency information, and individually transmitting a command signal for transition of an RRC protocol state or switching to another cell to the UE. The transition of the RRC protocol state is from a state where reception of the emergency information is disabled to a state where reception of the emergency information is enabled, and the other cell is such that the UE can receive the Secondary Notification signal, irrespective of the RRC protocol state of the UE.

Communication device and communication method

A mobile communication systemincludes a specific cell configured to allow a specific user to be provided with a service and to allow a non-specific user other than the specific user to be provided with a limited service. The mobile communication systemincludes a management unitconfigured to manage a presence state of the non-specific user in the specific cell in addition to a presence state of the specific user in the specific cell.

The first communication system is configured to determine whether or not to provide information that instructs the UEto connect to the second communication system, based on a subscriber identifier allocated to the UE. The subscriber identifier is configured to identify whether or not the UEis allowed to utilize the second communication system.

Mobile communication system, radio control apparatus, core network apparatus, mobile communication terminal and mobile communication method

A controller in a mobile communication system includes a management unit () configured to manage a resource usage condition in the mobile communication system and a determination unit () configured to determine a timer value for determining a frequency of transmitting a state transition request signal for causing a user equipment to transition to a power saving state after completion of communication of a data signal depending on the resource usage condition, and the timer value determined by the determination unit () is broadcast to the user equipment.

A mobile communication method according to the present invention includes the steps of: after a mobile station UE having RRC connection with the radio network controller RNC gets out of the coverage of the mobile communication system of WCDMA scheme, performing location registration to the mobile communication system of LTE scheme, issuing a notification to the radio network controller RNC by the exchange apparatus SGSN upon reception of predetermined signal, the notification implying that the mobile station UE performs the location registration to the mobile communication system of LTE scheme; and the radio network controller RNC releasing the resources for RRC connection without transmitting a signal to release the resources to the mobile station UE in response to the notification from the exchange apparatus SGSN.

Mobile communication method and radio access network apparatus

In a mobile communication system, definite resources in radio sectors are allocated to more users in an aspect that the users hardly feel stress during communication. When a call corresponds to an active call based on an active connection request that has been generated by a user's operation (that is, transmitting and obtaining delivery information of pull-type by means of arrows AC, DL or the like), as a trigger, more resources (communication rate is higher) are allocated to the call. When the call corresponds to a non-active call (that is, receiving and obtaining delivery information of push-type by means of an arrow SU or the like), fewer resources (communication rate is lower) are allocated to the call.

Mobile communication system, radio channel controller, mobile station, mobile switching center, and radio channel controlling method

Signals received from mobile station by respective slave units each are attenuated by a combination of attenuation factors set for the respective slave units, the attenuated signals thereafter are combined into a resultant signal in master unit, and the combination of attenuation factors is changed based on a predetermined rule. Then information about magnitudes of powers of signals received from the mobile station by the respective slave units is acquired based on change of information about a power of the resultant signal occurring with change in the combination of attenuation factors. At this time, the signal received from the mobile station by each slave unit increases its power with decreasing distance of the slave unit to the mobile station; therefore, distances from the mobile station to the respective slave units are estimated based on the information about the magnitudes of the powers, and the location of the mobile station is suitably estimated thereby.

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Yokohama, Japan

Hideyuki Matsutani