Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Hitachi Information & Communication Engineering, Ltd.

Hideo Aoe

Tsutomu Uchida

Takaaki Suzuki

Masato Inagaki

Hiroshi Tamaribuchi

Koji Hayata

Shiro Mazawa

Manabu Yoshimura

Masayasu Suzuki

Arata Nakagoshi

Koji Hirayama

Akio Kawase

Shuichi Miyazaki

Yi Lou

Junpei Watanabe

Shingo Sasaki

Kiyohiko Yoshida

Shuuichi Kozawa

A wireless communication system and its test method capable of executing a test of the wireless communication apparatus from a remote place by using a terminal generally used in wireless communication systems are implemented with a low-cost configuration and a simple procedure. A terminal obtained by installing a test AP on a general terminal that is used in general wireless communication systems and that can execute APs via a communication network is placed in a coverage area of a wireless communication apparatus. A maintenance center for the wireless communication system activates the terminal. The terminal executes the test AP and conducts communication with the maintenance center by using control signals and test signals for testing wireless communication system. A test is executed by measuring an actual communication state of the wireless communication system.

Wireless communication system and test method thereof, and access terminal for testing wireless communication system

A radio communication terminal, being used in a radio communication systems in which the transmission rate varies depending on radio wave conditions and communication statuses of other users, comprises a reception module which receives packets transmitted by a base station in an idle state of the radio communication terminal, a signal processing module which estimates a transmission rate available in communication based on the packets received by the reception module, and a display module which displays information indicating the transmission rate estimated by the signal processing module.

Method and apparatus for determining transmission rate based on number of unused slots

To improve efficiency of a radio section while reducing a no-communication period in the case of handoff in communication used DRC and DSC signals. A communication connection apparatus (BS)provided in a communication system accumulates data transmitted from the communication control apparatus (BSC). In a state in which a DSC signal from a communication terminal (AT)designates an owed BS, when a DRC indication from the ATis switched from another BS to the owned BS, the BStransmits data received from the BSClast to the ATout of the data accumulated in the BS. Consequently, missing data is requested from the BSat a handoff destination in accordance with a retransmission request function existing in the AT. Moreover, retransmission processing for data by a retransmission request message is performed in the BS

System and method for reducing a no-communication period during hand-off

Terminals #to #which have already been connected and a terminal #which wants to make a new connection send packets to a base station in that order. The base station queues the packets from the terminals #to #at a non-priority queue and the packet from the terminal #at a priority queue. For example, a predetermined amount of packets from a new connection is queued at the priority queue. Packets in the priority queue are dequeued with priority. Therefore, the packet sent from the terminal #is first sent to a base-station controller, and then the packets sent from the terminals #to #are sent to the base-station controller. As a result, the base-station controller first receives the packet sent from the terminal #and the period of time required for the terminal #to establish a connection is reduced.

Base station and base station controller for transmission of prioritized packets

Radio communication terminal and communication method

In data communication using radio communication, an inactivity timer value is changed according to various states, so that an unused time of a communication channel in a non-communication time is decreased, and channel use efficiency is raised. A unit for judging an application of packet data to be transmitted and received by a radio base station/a radio base station controlleris provided, or an inactivity timer value is set through a port number in TCP/UDP header and a traffic pattern and according to a communication content, and the set inactivity timer value is used to control a change from a connected state to a dormant state.

Radio base station/radio base station controller equipped with inactivity timer, mobile station, and state control method

In a mobile communication system in which a plurality of base stations are connected to a communication network via a packet transfer node and a transmission rate of a forward link radio channel between a base station and a mobile station dynamically changes, each of the base stations designates a packet transmission rate in accordance with the status of a radio channel of each of mobile stations under control for the packet transmission node, and the packet control node transfers packets destined for each of mobile stations to the base station at the designated transfer rate.

Wireless base station and packet transfer apparatus for dynamically controlling data transmission rate

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Yokohama, Japan

Hideo Aoe