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 communications system, base station apparatus, user apparatus, and method

Abstract: A user apparatus which wirelessly communicates with a base station apparatus within a mobile communications system is disclosed. The user apparatus includes a receive unit which receives control information in downlink; and a transmit unit which transmits a first channel in uplink, wherein the transmit unit, based on the control information, makes a value of a maximum transmit power of the first channel smaller than that of a nominal power specified for the mobile communications system.

Layer three quality of service aware trigger

Abstract: A method for providing a triggering mechanism in an all-IP wireless communication system. A plurality of communication paths are established between a mobile terminal and a correspondent node to obtain at least one QoS parameter associated with each communication path. Each communication path that provides a predetermined acceptable level of performance is then identified. A handoff trigger is then generated to the communication path that provides the highest level of performance to the mobile terminal.

Multicast signal transmission power control method and base station using the same

Abstract: In a transmission power control method of the present invention, a value of a received signal quality parameter of a received multicast signal is measured. A parameter signal, indicating the received signal quality parameter value, is transmitted from a plurality of mobile stations to a base station through a radio link. The parameter signals from the mobile stations are received at the base station through the radio link. A power control value of each of the mobile stations is determined based on the received signal quality parameter values of the received parameter signals. The transmission power of the multicast signal, sent to each of the mobile stations, is controlled based on the determined power control value.

Charging method for information communication network

Abstract: When a mobile accesses an IP (information provider), a gateway server judges whether or not the IP server is an object of information provider charging (S101). If not, the gateway server applies a user charging to the IP server, and transmits to a charging system the user management number of the mobile and the number of packets sent and received (S102). The charging system calculates the communication charge corresponding to the number of packets and issues a bill to the user specified by the user management number (S103). If the IP server is an object of an information provider charging, the gateway server applies the information provider charging to the IP server, and transmits to the charging system the number of packets sent and received and the address of the IP server (S104). The charging system calculates the communication charge corresponding to the number of packets and issues a bill to the IP (S105).

System and method for channel scanning in wireless networks

Abstract: Channel scanning for wireless networks, such as Wireless Local Area Networks (WLANs), generally provides a wireless station with the information on the available WLAN resources, such as the frequency band and the maximum transmission power The present invention provides safe and fast domain-aware channel scanning, enabling a wireless station to comply with applicable local regulations, in spite of the possibility of domain changes, with short channel-scanning time Fast channel scanning is accomplished by active channel scanning if valid domain information is available and there is no possibility of domain change Also, domain-independent channels, if any, are first scanned using active scan to get domain information faster