NTT DoCoMo

About: NTT DoCoMo is a based out in . It is known for research contribution in the topics: Base station & Mobile station. The organization has 4032 authors who have published 8655 publications receiving 160533 citations.

Mobile station and base station

Abstract: A mobile station includes a control unit for controlling modification of at least one of the following parameters for a transmission packet from a parameter of the transmission packet: a data modulation type, a channel encoding rate, a puncturing pattern, a diffusion rate, a frequency band width, a frequency allocation position, and transmission power A base station includes: a retransmission format deciding unit for deciding a pattern for modifying at least one of the following parameters: a data modulation type, a channel encoding rate, a puncturing pattern, a diffusion rate, a frequency band width, a frequency allocation position, and transmission power, from the parameter of the transmission packet and deciding a format of the transmission packet; and a control signal generation unit for generating the control signal according to information on the retransmission format decided by the retransmission format deciding unit

Dynamic Communication of Humanoid Robot with Multiple People Based on Interaction Distance

Abstract: Research on human-robot interaction is getting an increasing amount of attention. Since most research has dealt with communication between one robot and one person, quite few researchers have studied communication between a robot and multiple people. This paper presents a method that enables robots to communicate with multiple people using the ``selection priority of the interactive partner'' based on the concept of Proxemics. In this method, a robot changes active sensory-motor modalities based on the interaction distance between itself and a person. Our method was implemented into a humanoid robot, SIG2. SIG2 has various sensory-motor modalities to interact with humans. A demonstration of SIG2 showed that our method selected an appropriate interaction partner during interaction with multiple people.

Communication device, transmission control method, and program product

Abstract: The present invention provides a communication device, comprising: transmission means for transmitting a plurality of data segments via a packet communication network, each of the data segments including a sequence number, the data segments being transmitted in sequence number order; receiving means for receiving an acknowledgement indicating a data segment which the destination device requests the communication device to transmit next; retransmission means for changing a transmission rate and fro retransmitting one of the data segments in a case that the communication device has not received an acknowledgement including an acknowledgement number greater than a sequence number included in the retransmitted data segment when a predetermined time elapses following transmission of the original data segment; control means for determining a subsequent data segment to be transmitted next, and for controlling a transmission rate on the basis of a category of the acknowledgement and also information included in the acknowledgement.

Fast Authentication for Inter-domain Handover

Abstract: This paper proposes a method of fast authentication for inter administrative domain handover between two foreign mobile or wireless communication network domains. It is based on mutual trust and agreement between the two foreign domains and can be used as a complement of full authentication to reduce delay in handover phase.