73 results about "Radio lan" patented technology

A gateway object (48) for transmitting and receiving data to and from an object of a robot apparatus (1) is allocated to a radio LAN PC card (41) of the robot apparatus (1), and a gateway object (52) for transmitting and receiving data to and from an object on a personal computer (32) is allocated to a network adapter (31) of a remote system (30). When the radio LAN PC card (41) and the network adapter (31) are connected with each other by radio or wired connection, inter-object communication is carried out between the gateway object (48) of the radio LAN PC card (41) and the gateway object (52) of the network adapter (31), thereby carrying out inter-object communication between the object of the robot apparatus (1) and the object of the personal computer (32). Thus, preparation of a program is facilitated.

A high-frequency micro-strip line for transmitting a high-frequency wave for a wireless LAN system has a layered structure where, on a ground layer made of a conductive material, a dielectric layer made of a dielectric material and a signal line made of a conductive material are successively laid. The high-frequency micro-strip line further includes a patch antenna comprising a dielectric plate made of a dielectric material and a patch made of a conductive material, which are successively laid into a layered structure, the patch antenna being electrically connected to the signal line. A wireless-communication RF signal transmission device capable of being applied to such a line is also provided.

The method includes processing steps: request of shared cryptographic key authentication; response of shared cryptographic key authentication; acknowledgement of shared cryptographic key authentication. Through configured shared cryptographic key in advance, intercheck authentication and negotiation of session key is able to carry out between wireless terminals in self built network, thus, complicated public key certificate application and installation procedure is not needed any more. Features are: high security, small amount of calculation, and high efficiency.

A wireless LAN access authentication system capable of shortening the time required for an access authentication procedure of a radio terminal apparatus. In this wireless LAN access authentication system, when a radio terminal apparatus 116 of a user who has sent an access request is already registered through initial access, a gateway apparatus 111 searches for a WEP key assigned to the radio terminal apparatus 116 through a WEP key control section 306 and redistributes the WEP key registered beforehand to a new access point section 124 in the destination area and the radio terminal apparatus 116. The radio terminal apparatus 116 and access point section 124 to which the WEP key has been distributed encrypt transmission/reception data in a predetermined radio section using the redistributed WEP key and carry out a communication.

Using a combination of auto-correlation and cross-correlation techniques provides a symbol timing recovery in a Wireless Local Area Network (WLAN) environment that is extremely robust to wireless channel impairments such as noise, multi-path and carrier frequency offset. An auto-correlator provides an estimate for a symbol boundary, and a cross-correlator is subsequently used to more precisely identify the symbol boundary. Peak processing of the cross-correlation results provides further refinement in symbol boundary detection. In receiving a packet conforming to the IEEE 802.11a standard, the method requires a minimum of only three short symbols of the 802.11a short preamble to determine timing, and guarantees timing lock within the duration of the 802.11a short preamble. This method and system can be easily applied to any other preamble based system such as 802.11g and High Performance Radio LAN/2 (HIPERLAN/2).

This invention provides a method and system for receiving /sending short messages with radio LAN customer end to organize a short message receiving/sending system. If the message is sent to its user of the LAN, it is sent directly, if its sent to other mobile network, it is sent to the related exchange center database if it is sent to other RLAN user, it is processed and sent to a related RLAN short message manage server, if the user is not on-line, then the message is stored to be sent when the user is on-line to realize mutual communication with other radio mobile network user terminals conveniently.

A base station includes: a data classification function for classifying data to be transmitted to terminals into audio data and terminal-basis ordinary data and generating downstream communication traffic information; a queuing function for generating an ordinary data transmission queue and an audio data transmission queue from the classified data; a communication quality control parameter setting function for setting communication quality control parameters for the respective queues; a transmission and reception portion for transmitting data in the queues according to the communication quality control parameters at a time of transmission; a reception data detection function for acquiring upstream communication traffic information from reception data received from each of the terminals; and a communication quality control parameter control function for dynamically adjusting each of the communication quality control parameters in the communication quality control parameter setting function, based on the downstream and upstream communication traffic information.

The present invention discloses a wireless LAN system and a signal collision avoidance method for the wireless LAN system, which can avoid the collision of signals between a wireless LAN system initiating communication at fixed intervals and a wireless LAN system initiating communication after waiting for the vacancy of a channel. According to the present invention, when it is recognized that there is a no signal section between a downlink phase and an uplink phase upon scheduling of a communication frame, a scheduler part 6 performs scheduling for putting a NAV setup signal, which covers the no signal section, behind the downlink phase in accordance with instructions from a NAV setup signal generating part 8, and transmits the same. It can prevent any station in an IEEE802.11a wireless LAN system from transmitting data in the no signal section, and hence avoid the collision of signals within the period of the uplink phase.

This invention relates to a RF double-band voltage-controlled oscillator based on a central tapping inductor switch, in which, IEEE802.11 is one of the radio LAN protocols widely used in the world at present and the RF front of a radio router based on said protocol needs a phase-locking ring to generate local signals between 2.4G and 5G bands and a background technology applies an inductor switch double band voltage-controlled oscillator, which needs 4 inductors, this invented oscillator applies one inductor with a central tapping to replace the two of the four in the background technology, which is advantaged that the chip area occupied by the IC central tapping on the chip is much smaller than that occupied by the two inductors and especially suitable for being a RF double band voltage-controlled oscillator in the chip of a RF front of a radio router.

A radio LAN master station system which provides long distance communication and suffers from small interference by another system located inside and/or outside of a service area comprises a transceiver, and a plurality of directivity antennas each directed to respective section with some angular spacing, through a power distributor which couples said transceiver with said antennas. Polarization plane of any antenna is orthogonal to polarization plane of an adjacent antenna.

A method of data communication based on internetwork can make the User of radio LAN and the User of cable LAN interview cable WAN system resource first, if cable WAN system resource can be interviewed, or interview to radio WAN system resource through radio WAN network card module, and then to interview Internet resource indirectly, if cable WAN system resource can not be interviewed by using defined mobile bridge equipment, i.e both the user of radio LAN and the User of cable LAN can interview network data resource at most conditions.

The method comprises: user sends the description message of the resources to be looked up to the coprocessor; the coprocessor expands the management frame of the Probe Request, and encapsulating the description message of the resource to be looked up into the Probe Request to broadcast; the processor in the radio network terminal receiving the Probe Request resolves the description message in the Probe Request management frame and sends the description message to user; if user determines to give a response, and sends the response content to the processor of the terminal, the processor encapsulating the response content in an expanded Probe Response frame to send out; the processor in device receiving the Probe Response management frame Resolves the content of the Probe Response frame and sends it to user.

In the present invention, a blue-tooth communication and network connection software are installed in hand-held game set, so that the hand-held game set may be used as one server, which may be connected to at least one other hand-held game set in client end with the blue-tooth communication and network connection software for transmitting information and forming one small radio LAN. The server can utilize the network connection software to create one radio network game and manage the game, and the client end may join in or exit from the game optionally. The server can update the data of the network game synchronously.

This invention discloses a method for distributing enciphered cryptographic keys in radio LAN which combines distribution of cryptographic keys and CHAP certification and utilizes the certification server user name and cipher management function to manage distribution of cryptographic keys. Users can pan in large sphere not influencing dynamic distribution of cryptographic keys, at the same time a same user uses different cryptographic keys for different sessions to increase safety.

The present invention provides one kind of portable USB equipment and its switch method. The portable USB equipment may be in storing operation mode, radio communication operation mode or interruption operation mode. The portable USB equipment includes one USB interface module for connection to the USB interface of the system unit; one memory module for read/write data; one radio communication module for access to radio LAN to complete radio communication; and one switching module for switching between the memory module and radio communication module, with the switching module including one mechanical switch, the first analog switch and the second analog switch.

This invention provides a vehicle compartment radio LAN system for communicating with a terminal installed in a vehicle compartment through a repeater, wherein a repeater is provided in front of each seat row. Thus, a terminal installed in a front seat communicates by radio through a repeater, a terminal installed in a second seat communicates by radio through another repeater and a terminal installed in a third seat communicates by radio through still another repeater.

Information data accumulated in a content database 9 arranged on the Internet 7 is acquired in a relay device 6. A music file 3 is outputted from a street loudspeaker 5 connected to the relay device 6. Simultaneously with or prior to the output processing via the street loudspeaker 5 by a radio LAN base 4 connected to the relay device 6, the music file 3 is distributed by radio communication. In a user terminal 2 used by a user, one information data received from the distribution device is temporarily stored in a cache memory 25. According to a user operation, the music file 3 accumulated in the cache memory 25 is written into a memory 24. Thus, by push-type distribution, it is possible to enhance the user willingness to buy and distribute a content without missing the chance to sell the content.

The present invention is one kind of sound and image signal transmission device for sound and image signal transmission in a radio LAN. Before transmission, one total transmission rate is determined. The sound and image signal transmission device has at least one set of compression specification, and when there is some signal input to the device, compression specification and compression ratio required by the image and sound signal are first judged and selected and the image and sound signal is then compressed in the selected compression specification and compression ratio to make the total transmission amount after being compressed in the preset total transmission rate range.