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.

Radio base station, user device, and method used in mobile communication system

Abstract: A radio base station used in a mobile communication system is disclosed. The radio base station includes a scheduler configured to allocate one or more resource blocks, which are defined by a predetermined bandwidth and a predetermined transmission time interval, to a user device; and a reporting unit configured to report scheduling information indicating radio resource allocation to the user device. The scheduler is configured to generate the scheduling information such that downlink data channels and downlink control channels are transmitted using the transmission time interval as a transmission unit and uplink control channels are transmitted using an integral multiple of the transmission time interval as a transmission unit.

Communication system and method for locating and utilizing distributed resources

Abstract: A communication system includes one or more independent communication networks. Each network includes one or more resource management devices, resources managed by the resource management device, and one or more resource arbitration servers. The communication system further includes a communication device adapted for communication on each of the one or more communication networks.

Beam selecting method, base station, and user equipment

Abstract: A beam selection method in a mobile communication system including a base station with multiple antennas and user equipment conducting radio communication with the base station includes the steps of, at the base station, detecting a direction in which the user equipment is located, transmitting precoded reference signals toward the detected direction by spatial multiplexing using same frequency and time resources, and determining a beam for the user equipment based upon feedback information from the user equipment

Time slot allocating apparatus, time slot allocating method thereof, memories and programms, mobile communication system and operating method

Abstract: Concerned is time slot allocation in the CDMA-TDD scheme. A time slot of an uplink (UL) is allocated to a mobile station MS1 in cell 1. At this time, a time slot of a downlink (DL) having the same time slot number as that of the foregoing time slot is allocated to a mobile station MS2 in an adjacent cell 2 without avoiding the allocation. If there can occur deterioration of communication quality a process of allocating another time slot or the like will be performed as in the case of a mobile station MS2-1.

Through different eyes: assessing multiple conceptual views for querying web services

Abstract: We present enhancements for UDDI / DAML-S registries allow-ing cooperative discovery and selection of Web services with a focus on personalization. To find the most useful service in each instance of a request, not only explicit parameters of the request have to be matched against the service offers. Also user preferences or implicit assumptions of a user with respect to common knowledge in a certain domain have to be considered to improve the quality of service provisioning. In the area of Web services the notion of service ontologies together with cooperative answering techniques can take a lot of this responsibility. However, without quality assessments for the relaxation of service requests and queries a personalized service discovery and selection is virtually impossible. This paper focuses on assessing the semantic meaning of query relaxation plans over multiple conceptual views of the service ontology, each one representing a soft query constraint of the user request. Our focus is on the question what constitutes a minimum amount of necessary relaxation to answer each individual request in a cooperative manner. Incorporating such assessments as early as possible we propose to integrate ontology-based discovery directly into UDDI directories or query facilities in service provisioning portals. Using the quality assessments presented here, this integration promises to propel today's Web services towards an intuitive user-centered service provisioning.