Ntt Docomo, Inc.

Hiroto Tooyama

Yoshifumi Morihiro

Kouji Makino

Wuri Andarmawanti Hapsari

Minami Ishii

Keisuke Suzuki

Hideaki Takahashi

Tooru Uchino

Narumi Umeda

Kentaro Fujii

Shinsuke Sawamukai

Midori Mori

Masato Hiraki

Kazuhide Takahashi

Yuuki Kishikawa

Satoshi Namie

In Inter-eNB handover with 'full configuration', UL-PDCP-PDUs are handled appropriately. A mobile communication method according to the present invention includes, in Inter-eNB handover of a mobile station UE from a radio base station eNB#to a radio base station eNB#, the step of causing the radio base station eNB#to discard all the UL-PDCP-PDUs having been successfully received, if the radio base station eNB#instructs the mobile station UE to once delete all the configuration set between the mobile station UE and the radio base station eNB#

Mobile communication method and radio base station

A mobile communication system includes a first radio control device that manages a first cell, a second radio control device that manages a second cell, and a third radio control device. The second cell is set as a handover destination cell of the first cell. The third radio control device manages the second cell as a redundant configuration of the second radio control device. The third radio control device notifies the first radio control device of the third radio control device managing the second cell as the redundant configuration of the second radio control device. The first radio control device sets so that the third radio control device manages the second cell as the redundant configuration of the second radio control device.

Mobile communication system, and mobile communication method and radio control device used in mobile communication system

A mobile communication method according to the present invention includes the steps of: when a gateway apparatus (S-GW) is switched from a first state where downlink data is transmitted to a first radio access apparatus to a second state where the downlink data is transmitted to a second radio access apparatus, transferring, from the first radio access apparatus to the second radio access apparatus, the downlink data which is received from the gateway apparatus and to which specific information is added; and transmitting, from the second radio access apparatus to a mobile station (UE), transfer downlink data which is transferred from the first radio access apparatus and to which the specific information is added, before new downlink data transmitted from the gateway apparatus (S-GW).

Mobile communication method, radio access apparatus, and gateway apparatus

A second communication system starts transmission of direct data received from a core network apparatus without waiting to receive an end marker when the end marker indicating the last forwarding data forwarded from the first communication system is not received within an end marker waiting period.

Mobile communication system, network apparatus, and mobile communication method

A mobile communication system having a first communication system and a second communication system forwards forwarding data from the first communication system to the second communication system when switching from the first communication system to the second communication system is determined, the forwarding data being a data that the first communication system has already received from a core network device. A network device transmitting direct data to a mobile communication terminal via the second communication system is configured to count the number of switching times that the switching from the first communication system to the second communication system has been determined, for every user. The network device is configured to count the number of successful reception times that information identifying a user has been received via a forwarding path of the forwarding data, for every user. The network device is configured to judge whether the forwarding path of the forwarding data is normal or not on the basis of a ratio between the number of switching times and the number of successful reception times.

Mobile communication system, network device, and mobile communication method

A radio network controller activates a signal transmission suppression timer to suppress transmission of a congestion signal, when a new radio base station is added as a radio base station with which the radio terminal is to communicate, and suspends the transmission of the congestion signal to the radio base stations until the signal transmission suppression timer expires.

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Tokyo, Japan

Hiroto Tooyama