A communication processing apparatus that acts as a server for transmitting data to a client includes a data transceiver configured to carry out communications with the client; a rate controller configured to control a bitrate of data transmitted to the client; and a data processor configured to prepare data to transmit in accordance with the bitrate. The rate controller includes a throughput calculator configured to extract an effective data transmission and reception period not including an ineffective data transmission and reception period in a period during which a communication connection is maintained between the server and the client, and to calculate a maximum throughput on the basis of the length of the effective data transmission and reception period and the amount of data transmitted; and a bitrate setter configured to set a bitrate within a range of up to a maximum allowable bitrate corresponding to the maximum throughput calculated by the throughput calculator.

Communication processing apparatus, data communication system, and communication processing method

The invention relates to a wireless network of devices including a network device and a coordinator; the coordinator comprising transmission and reception means for wireless communication; and the network device comprising transmission means and reception means for wireless communication; and control means operable to selectively cause the device to communicate according to two different channel access schemes, a higher throughput scheme and a lower throughput scheme; wherein a trigger is provided in the network for a switch from the lower throughput scheme to the higher throughput scheme, wherein the trigger is determined taking into account the network device's transmission requirements. The transmission requirements may be based on a network according to the present invention, wherein the transmission requirements are defined based on one or more of the following factors: data waiting in the network device's buffer, emergency status of a device, urgency status of a device and battery level.

Short range wireless networks

A system which is configured to enable a vehicle's embedded USB Host system to connect to multiple mobile devices through a USB Hub, regardless of whether the mobile devices are configured to act as USB Hosts or USB Devices, without the need to add or provide OTG controllers in the system or additional vehicle wiring, or inhibiting the functionality of any consumer devices operating in USB Device mode connected to a vehicle system Hub while another consumer device connected to the same Hub operates in USB Host mode. Preferably, the system is configured to provide that no additional cabling is required, and no hardware changes are required to be made to the HU. The system can be employed between a vehicle's embedded USB Host, USB Hub and at least one consumer accessible USB port. In the case where the consumer device is acting as a USB Host, signals between the consumer device and the vehicle's embedded USB Host are processed through a bridge, thereby rendering the consumer device compatible with the vehicle's embedded USB Host.

Flexible mobile device connectivity to automotive systems with USB Hubs

Method and apparatus for accessing channel using null data packet in wireless lan system

A method and apparatus for performing a relay operation in a wireless LAN (WLAN) system are disclosed. A method for performing a relay operation by an entity of a wireless LAN (WLAN) system includes: transmitting a frame including information indicating whether the entity is a relay access point (AP) or a root AP to at least one station (STA), wherein, if the entity is the relay AP, the frame further includes a Medium Access Control (MAC) address of the root AP associated with the entity.

Method and apparatus for performing relay operation in wireless lan system

PROBLEM TO BE SOLVED: To provide a wireless LAN system with a simple configuration extending its service area without the need for extending number of base stations AP. SOLUTION: In the wireless LAN system including a first terminal belonging to a BSS and making communication with an access point master station of the BSS and a second terminal existing at the outside of the BSS, the first terminal (STA 14) includes a wireless section 132 and a wireless control section 133 that make communication with the access point master station in the BSS over a first frequency channel, use at least part of periods among communication periods in the BSS, select a second frequency channel different from the first frequency channel, and make communication with the second terminal. COPYRIGHT: (C)2007,JPO&INPIT

Wireless lan system, relaying terminal equipment, and relaying method

PROBLEM TO BE SOLVED: To provide an information distributing system providing distribution of community-based information such as various pieces of service information of a shopping street to a multiplicity of users. SOLUTION: The distributing system for service information comprises a computer of an information provider side providing the information, a user terminal receiving the information from the information provider side computer, and a network connecting the information provider side computer and the user terminal. It is characterized in that the information provider side computer is composed so as to repeatedly distribute store information showing a store providing service and information of the service provided by the store to the user terminal. COPYRIGHT: (C)2003,JPO

Distributing system, distributing method and its computer program for service information

PROBLEM TO BE SOLVED: To directly transmit and receive data to and from a USB peripheral device while performing data transmission and reception between a USB host device and the other USB peripheral device. SOLUTION: A USB hub device which relays data transmission and reception to each of a plurality of USB peripheral devices through a downstream port is provided with a hub repeater which has a function of directly connecting arbitrary downstream ports to each other. When receiving a direct connection request, the USB hub device instructs the hub repeater to arbitrarily directly connect downstream ports designated by the request to each other. When receiving a SOF packet, the USB hub device relays and transmits the SOF packets to all downstream ports and disconnects links between the designated downstream ports and upstream ports connected to the USB host device to allow the designated downstream ports to be arbitrarily directly connected to each other. COPYRIGHT: (C)2005,JPO&NCIPI

Usb hub device, usb peripheral device, and data transmission and reception method

PROBLEM TO BE SOLVED: To obtain maximum throughput without consuming the traffic of a transmission path while suppressing the complication of the configuration of a receiving side device and a load increase in a processing operation. SOLUTION: A packet transmitting side device preliminarily acquires a packet transmission interval when a packet can surely be received from a packet receiving side device, stores the packet transmission interval in a transmission interval storing part and uses the interval to perform packet transmission by a transmission control part. This can prevent the occurrence of packet retransmission due to the unreceivable state of the packet receiving side device. In addition, if the receiving capability of the packet receiving side device drops in its actual operating state for some reason or other, the packet transmitting side device measures the receiving capability of the packet receiving side device and updates contents of the transmission interval storing part by using an optimum transmission interval. This always enables stable packet transmission and reception. COPYRIGHT: (C)2004,JPO&NCIPI

Method and device for transmitting and receiving packet

PROBLEM TO BE SOLVED: To provide a wireless communication device capable of reducing a frequency of retransmission and data rate change to improve the usage efficiency of media. SOLUTION: The wireless communication device for performing transmission and reception with other wireless communication device by changing a data rate includes: a receiving means for receiving a packet from the other wireless communication device; a calculating means for calculating received electric field strength information expressing a receiving quality based on the received packet; a storing means for storing a table associating the received electric field strength information with the data rate; a determining means for determining an optimum data rate based on the table; and a transmitting means for transmitting the determined optimum data rate to the wireless communication device. COPYRIGHT: (C)2011,JPO&INPIT

Wireless communication device, wireless communication method, wireless communication program, and recording medium

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