Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: A communication network includes a plurality of devices and a control unit for generating control signals to control the operation of the devices. Each device includes: a device operating circuit, a communication interface for receiving command signals for controlling operation of the devices, a control circuit coupled between the device operating circuit and the communication interface for controlling the operation of the device operating circuit part in dependency of said command signals, and a master integral to the device for receiving the control signals, for generating the command signals in response to the received control signals, and for transferring the command signals to the communication interfaces of the plurality of devices. The communication network activates one of the masters as an active master, and in case the active master fails, then it activates another master to take over as the active master.

Abstract: A wireless transceiver includes: (a) a low power radio frequency (LPRF) communications component capable of powering down to conserve energy and capable of powering up in response to an electronic signal, the LPRF communications component including a transmitter and a first receiver; and (b) a second receiver that is configured to screen a radio frequency broadcast and provide, on the basis of specific data identified therein, the electronic signal to the LPRF communications component in order to power up the LPRF communications component. The second receiver is adapted to draw less current than the LPRF communications component while awaiting receipt of and listening for a radio frequency broadcast.

Abstract: The present invention relates to a method for determining a distance between a wireless transceiver and a wireless receiver arranged to communicate with each other in a wireless communication network, the wireless receiver having an active and an inactive reception state, the method comprising transmitting, with the wireless receiver in the active reception state, a first transmission signal, receiving a first reflection signal, the first reflection signal being a reflection of the first transmission signal and influenced by the active reception state of the wireless receiver, transmitting, with the wireless receiver in the inactive reception state, a second transmission signal, receiving a second reflected signal, the second reflection signal being a reflection of the second transmission signal and influenced by the inactive reception state of the wireless receiver, and determining a distance between the wireless transceiver and the wireless receiver based on the second reflection signal.

Abstract: A software-controlled communication method and an apparatus thereof is disclosed. The apparatus includes a radio frequency (RF) front end unit for sending a data signal or a voice signal to a cordless phone base station via an antenna, an analog-to-digital for converting an analog signal received from the RF front end unit into a digital signal and a digital-to-analog converter for converting a digital signal into an analog signal and providing the converted signal to the RF front end unit, and a baseband signal processor, having a plurality of signal processing modules for processing communication signals and a control module for controlling the signal processing modules installed therein as software modules, for providing cordless phone and handset transceiver functions.

Abstract: An improved network interface device includes at least two wireless network transceivers where the transceivers share at least one antenna. In one embodiment, one of the transceivers is a 2×2 MIMO WiFi N transceiver and the other of the transceivers is a 2×1 MIMO WiMAX transceiver. A priority selector and lockout control circuit is used to control which transceiver has access to the shared antenna. The control circuit of one embodiment is arranged so the WiMAX transceiver is given priority access to the shared antenna.

Abstract: A wireless communication apparatus includes a mounting substrate having a duplexer, receiving and transmitting amplifiers individually connected to the duplexer, a processor unit having receiving and transmitting processors connected to the respective amplifiers, and a baseband processor connected to the processor unit. A shield case covers the amplifiers and the processor unit, and has a first partition provided from a top panel to a mounting substrate surface for separating the receiving and transmitting amplifiers, extending from an end and a second partition extends to another end from a cut extending from the first partition being laid across the processor unit.

Abstract: An embodiment of the present invention provides a method of closed loop MIMO calibration in a wireless communication system, comprising detecting that station calibration is obsolete and requires calibration, determining a range of automatic gain control which the station wants to calibrate and determining a list of transmission power for an Access Point (AP) in communication with the station, initiating by the station the calibration by sending the power list and N channel sounding preambles, where N is the number of transmit antennas at the station; and sending back by the AP a channel matrix and L sets of channel sounding preambles with a different transmission power level for each set, where L is the number of entries in the power list.

Abstract: A modular personal device system, in which the system has two parts: a core module and a shell module. The overall functionality available to the combined system is divided between the core module and the shell module such that a single core module is operable with a plurality of different types of shell modules.

Abstract: The invention provides a wireless connection establishment method enabling determination of a transmission format while giving consideration to security when conducting a connection establishment needed to send and receive multimedia information between radio devices having a radio communication function. In the invention, a radio device control terminal requests an authentication server to conduct authentication with respect to radio devices requesting a connection and then an authentication process is performed by the authentication server. When the radio devices are authenticated properly, the radio device control terminal acquires each transmission format of the radio devices from an information management server to determine a radio transmission format common to these radio devices. The radio transmission format thus determined is sent to the radio devices, so that the radio devices establish a wireless connection with each other by use of the radio transmission format.

Abstract: In one embodiment, the present invention includes a method for receiving at a transceiver from a baseband processor digital control information that includes both event and schedule information, storing the digital control information in a storage of the transceiver, and operating the transceiver according to the event and schedule information.

Abstract: A wireless transceiver includes: (a) a low power radio frequency (LPRF) communications component capable of powering down to conserve energy and capable of powering up in response to an electronic signal, the LPRF communications component including a transmitter and a first receiver; and (b) a second receiver that is configured to screen a radio frequency broadcast and provide, on the basis of specific data identified therein, the electronic signal to the LPRF communications component in order to power up the LPRF communications component. The second receiver is adapted to draw less current than the LPRF communications component while awaiting receipt of and listening for a radio frequency broadcast.

Abstract: A dial system for steering wheel of an automobile is divided into two portions electrically connected by a cable and each includes a first casing and a dial set received in the first housing. The dial set includes a number button partially extending the first housing for being operated. A circuit board is received in the first housing for wirelessly transmitting signals when the buttons are operated. A second housing is mounted to the first housing to form a space for receiving the dial set and the circuit board. A battery seat with battery is laterally inserted into the space for providing power to the circuit board. A clamp is mounted to a bottom of the second housing and clamps the steering wheel to hold the dial system in place on the steering wheel for an easy operation.

Abstract: A wireless transceiver includes: (a) a low power radio frequency (LPRF) communications component capable of powering down to conserve energy and capable of powering up in response to an electronic signal, the LPRF communications component including a transmitter and a first receiver; and (b) a second receiver that is configured to screen a radio frequency broadcast and provide, on the basis of specific data identified therein, the electronic signal to the LPRF communications component in order to power up the LPRF communications component. The second receiver is adapted to draw less current than the LPRF communications component while awaiting receipt of and listening for a radio frequency broadcast.

Abstract: An integrated circuit. The integrated circuit is usable in a transceiver module. The integrated circuit includes an input port that is configured to receive a data stream. A clock port on the integrated circuit is configured to receive a reference clock diplexed with another signal or voltage used by the integrated circuit. An eye opening circuit is connected to the input port and clock. The eye opening circuit is configured to retime the data stream received at the input port. An output port is connected to the eye opening circuits The output port is configured to transmit a retimed signal from the eye opening circuit to a device external to the integrated circuit. A bypass circuit is connected to the input port and the output port. The bypass circuit may selectively bypass the eye opening circuit.

Abstract: Transceiver comprising a low power RF radio broadcast transmitter having means to modulate a transmitter carrier frequency with a baseband modulation signal as well as transmitter tuning means to vary said transmitter carrier frequency within an RF radio broadcast band. To secure that operation of said transmitter means will not cause interference to broadcast reception, said transceiver includes an RF radio broadcast receiver having a search tuning circuit being provided with channel selecting means for, in a receiving mode of the transceiver, detecting a free RF radio broadcast channel within said RF radio broadcast band carrying no RF signal exceeding a predetermined threshold level, said channel selecting means supplying tuning data defining said free RF radio broadcast channel to means for transmitting said tuning data to said transmitter tuning means for tuning said transmitter carrier frequency to said free RF radio broadcast channel in a transmitting mode of the transceiver.

Abstract: Briefly, some embodiments of the invention may provide devices, systems and methods for multi-profile wireless communication. For example, a wireless communication module may include first and second ports, and may be able to selectably operate in either a first mode of operation, in which said first port is used as an input port for incoming signals and said second port is used as an output port for outgoing signals, or a second mode of operation, in which said second port is used as an input port for incoming signals and said first port is used as an output port for outgoing signals.

Abstract: A device for receiving and transmitting wireless signals includes a transceiver capable of receiving a wireless signal; and a standards-based radio capable of activation thereof in response to a reception of a wireless signal by the transceiver. The transceiver includes a receiver capable of receiving a wireless signal transmitted to prompt activation of said standards-based radio; and a transmitter configured, in response to a reception by said receiver of a wireless signal transmitted to prompt activation of said standards-based radio, to selectively transmit a wireless signal for another transceiver to prompt activation of another standards-based radio.

Abstract: In an information access system, an active contactless information storage device senses a carrier of an RF signal at a first frequency in first predetermined periods occurring in a predetermined cycle and senses a carrier of an RF signal at a second frequency in second predetermined periods occurring in the predetermined cycle. When the storage device senses and detects a carrier of an RF signal at one of the first and second frequencies in a particular predetermined period, it receives further an ID request signal, and, in response to the ID request signal, transmits a response signal at a corresponding one of the third and fourth frequencies that carries an ID of the active contactless information storage device. This reduces possible interference between reader/writer devices for communicating with the information storage device.

Abstract: It is an object of the present invention to provide a wireless transmitting/receiving method for achieving both a high-speed data transfer and a power-saving operation by using wireless transmitting/receiving apparatus adaptable to a ubiquitous system, whereby a wireless transmitting/receiving method which performs wireless transmission/reception using no less than two carrier waves which belong to a different frequency band is used to transmit/receive a control signal for controlling the transmission/reception operation of the wireless transmitting/receiving apparatus by using a carrier wave which belongs to a lower frequency band (400 MHz band), and to transfer data by using a carrier wave which belongs to a higher frequency band (2.4 GHz band).

Abstract: A receiving device embodiment receives a user command from an external source. The user command is directed to a remote target destination. A first interactive programming command communicator embodiment generates a mobile device command from the received user command, and communicates the mobile device command to a mobile device. A second interactive programming command communicator embodiment receives the mobile device command from the receiving device. A target destination is identified from information in the mobile device command, and information from the mobile device command is communicated to the target destination.

Abstract: A multi-mode wireless device having a transceiver including a multi-mode transmitter and a multi-mode receiver. The transmitter can include a multi-mode transmit baseband portion configured to support all of the transmit modes. Similarly, the receiver can include a multi-mode baseband portion that is configured to support all of the receive modes. The transmitter can also include a frequency conversion stage that can convert the output from the transmit baseband portion to the desired transmit frequency. Multiple power amplifiers in parallel, each configured to support one or more of the operating modes, can selectively amplify the transmit signals. The receiver can include multiple low noise amplifiers (LNAs) in parallel, each configured to selectively amplify the received signals of one or more of the operating modes. The output of the LNAs can be coupled to a frequency conversion stage that downconverts the received signals and provides them to the baseband portion.

Abstract: A device, a method and a system for portable data storage and transfer through a simplified device interface. The operations of the device are restricted, in order to increase the ease of use of the device, and in order to provide certain core functions. These core functions include reading data, writing data and exchanging data with a similar device and/or with an external computer. The device features a minimal set of hardware components for accomplishing these functions, such as a data processor of some type, a memory storage medium or media, and a data exchange mechanism, which may optionally be an infrared port for example.

Abstract: A variable gain frequency multiplier comprises a multiplier circuit and a control circuit configured to receive a power control signal, the power control signal being proportional to a power output signal.

Abstract: A radio line is easily influenced in its nature by attenuation or reflection of an electromagnetic wave or the like and the surrounding environment. Due to this fact, a variation of the data transfer speed frequently occurs at the time of image streaming so as to become a hindrance to reproduction of an image at the receiving terminal. A distribution server is provided with a multiplexer for multiplexing information indicating the transmission start time for the image data and a switching unit for switching an image bit rate in response to a request from the receiving terminal. The receiving terminal uses information indicating a transmission start time for the image data, monitors the receiving bit rate and sends out a request for transmission of the most-suitable image bit rate in response to a comparison thereof.

Abstract: Transmission and reception of the identification number to/from an interrogator includes an interrogator that reads a recognition number from a responder by radio. When a clock pulse is modulated on a high-frequency carrier and transmitted to the responder from the antenna of the interrogator, there are a first case when the clock pulse interval is short and a second case when the clock pulse interval is long. By combining the clock pulse of the first case and the clock pulse of the second case so as to control the read of the recognition number from the interrogator, it is possible to realize reduction of the semiconductor chip size of the responder and suppress the cost of the semiconductor chip.

Abstract: A diplexer contains a common terminal connected to an antenna, a first input/output terminal for inputting/outputting signals of a plurality of high frequency bands higher than a predetermined frequency, and a second input/output terminal for inputting/outputting signals of low frequency bands lower than the predetermined frequency. Between the common terminal and the first input/output terminal, a high pass filter and low trap circuits for attenuating the low frequency bands respectively are interposed in series, and, between the common terminal and the second input/output terminal, a low pass filter and high trap circuits for attenuating the high frequency bands respectively are interposed in series.

Abstract: There is provided a method for use by a computing device for automatically establishing a dial-up connection to a network through a mobile device. The method includes establishing a communication link with a mobile device. For example, the mobile device can be a cellular telephone and the communication link can be a Bluetooth communication link. The method further includes receiving network identification data from the mobile device, where the network identification data indicates the type of the network, e.g., Global System for Mobile (“GSM”) communications or Code Division Multiple Access (“CDMA”). The method further includes configuring a dial-up connection entry in the computing device and configuring connection entry in the mobile device based on the type of the network, and establishing the dial-up connection to the network using the dial-up connection entry.

Abstract: A transceiver operates in a communication environment capable of including other transceivers, wherein the transceiver sends and receives traffic in accordance with a first communications standard, and other transceivers send and receive traffic in accordance with other communication standards that are incompatible with the first communications standard such that traffic sent in accordance with any of the first and other communications standards cannot be received by a receiver operating in accordance with any other one of the first and other communications standards. The transceiver identifies a carrier frequency for use as a shared broadcast channel that is accessible by the transceiver and by the other transceivers, and broadcasts information on the shared broadcast channel, wherein the information informs the other transceivers of the presence of the transceiver.

Abstract: A transceiver system including a common receiver and transmitter oscillator. The transceiver system may include transmitter circuitry, receiver circuitry, and a first oscillator. The first oscillator may provide a transmit frequency to a mixer in the transmitter circuitry to generate a transmitter RF signal. Furthermore, the first oscillator may also provide the transmit frequency to a first stage mixer in the receiver circuitry to down-convert a receiver RF signal from a receive frequency to an intermediate frequency (IF). The receiver circuitry may include a second oscillator and a second stage mixer. The second oscillator may provide an IF frequency to the second stage mixer to down-convert receiver signals at IF to a lower frequency. The receiver circuitry may filter out transmitter RF feedthrough signals without using a SAW filter. The transmitter circuitry, the receiver circuitry, and the first oscillator may be included in a single IC.

Abstract: A system for controlling transceivers based on a location of the transceivers, as indicated by a location indicator, helps to reduce crosstalk interference in signals transmitted from central offices. The system utilizes a location indicator and logic. The location indicator is communicatively coupled to each of a plurality of transceivers and is indicative of whether the plurality of transceivers are located at an intermediate terminal or a central office. The logic is configured to control a physical layer of each of the transceivers based on the location indicator.

Abstract: Briefly, some embodiments of the invention provide devices, systems and methods of multiple transceivers control. For example, a method in accordance with an embodiment of the invention may include determining whether interference is expected between an intended activity of a first wireless transceiver of a wireless communication station and an activity of a second wireless transceiver of said wireless communication station; and based on the determination result, modifying an operational parameter of an interference reducer of said wireless communication station.

Abstract: An apparatus and method for overcoming pilot pollution in a wireless communications network. The apparatus boosts a preferred pilot signal within a geographical area that is suffering from pilot pollution. The boosted pilot signal is stronger than the pollution in this area, and causes mobile stations to lock onto the boosted pilot signal rather than the pollution. A directional receiving antenna on the apparatus receives the preferred pilot signal from a selected base station. After amplifying the preferred pilot signal, the apparatus transmits the boosted pilot signal from an antenna within the geographical area. In this manner, mobile stations lock communicate with the selected base station when within the geographical area rather than the base station responsible for the pilot pollution. This may result in fewer dropped calls from the network and fewer inappropriate hand-offs.

Abstract: One or more identifiers are set for each terminal and a priority ranking is allocated to each identifier to determine priority of one scheduling command relative to any other scheduling command. A data block is transmitted from the base station to the, or each, terminal, including the scheduling command and at least one identifier. Each terminal indicated by the identifier adapts its power level or data rate in accordance with the scheduling command.

Abstract: A portable communication terminal with a camera carries out an intermittent reception operation during standby reception in order to reduce power consumption. The portable communication terminal stops an operation clock (16) for a camera (8) right before a time period of a reception slot (RX) during the intermittent reception operation. In the portable communication terminal, a photographed image right before stop of the operation clock is displayed on a display unit (9) for a stop time period until restart of the operation clock (16). The stop time period is short so as not to be recognized by eyes of a human being.

Abstract: An audio device includes a Bluetooth receiver, a Bluetooth transmitter, a speaker and a housing. The Bluetooth receiver is capable of wirelessly receiving signals in at least two audio channels. The Bluetooth transmitter is capable of wirelessly retransmitting at least a first one of the two audio channels. The speaker plays the second one of the two audio channels. The housing contains the Bluetooth receiver, the Bluetooth transmitter, and the ear phone. The housing is shaped to fit in or on an ear of a user.

Abstract: A method for channel bonding begins when a master transceiver receives a channel bonding sequence. The process continues with the master transceiver generating a channel bonding request and transmitting it and channel bonding configuration information to the slave transceiver. The process continues with each slave receiving the channel bonding sequence, the channel bonding request and the channel bonding configuration information. The process continues as each slave processes the channel bonding request and the channel bonding sequence in accordance with the channel bonding configuration information to determine individual slave channel bonding start information. The process continues as the master processes the channel bonding sequence in accordance with the channel bonding configuration information and the channel bonding request to determine master channel bonding start information.

Abstract: The invention relates to a control module in telecommunications end devices, in particular in mobile telephones, that enables a two-way control of the mobile radio unit and the broadcast unit. Additionally, setting information from the entire system can also be transferred over control channels.

Abstract: An integrated circuit (IC) includes a baseband processing module and a radio frequency (RF) section. The baseband processing module is coupled to convert outbound data into amplitude modulation information and phase modulation information when the IC is in a cellular data mode and to convert an outbound radio frequency identification (RFID) signal into RFID amplitude modulation information when the IC is in an RFID mode. The RF section is coupled to generate an outbound RF data signal in accordance with the amplitude modulation information and the phase modulation information when the IC is in the cellular data mode and to generate an outbound RF RFID signal in accordance with the RFID amplitude information when the IC is in the RFID mode.

Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract: A first housing 14 is provided with a first and a second terminals 11a, 11b to be connected with a first and a second external antennas. A second housing 13 is connected via a coaxial cable 9 with the first housing 14. The first housing 14 includes a switch 10 connected via a capacitor 3b with the coaxial cable, for selectively connecting one of the first and second terminals 11a, 11b which provides higher receipt sensitivity on the basis of a switching signal and a DC power supply 12 connected via an inductance 4b to the coaxial cable 9. The second housing 13 includes a radio circuit 2 connected via the capacitance 3a with the coaxial cable 9, for processing a radio signal to be transmitted, supplying the processed radio signals to the first or second internal antenna 7 or 8 and processing the received radio signal.

Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract: The invention concerns a method (300) and system (100) for interrupting a dispatch call. The method can be practiced in a dispatch communications system (100) having at least a first communications channel (162) for carrying voice traffic and a second communications channel (164) for carrying communications-enabling information. The method includes the steps of assigning (312) the first communications channel to at least a first caller (133) and a second caller (135) to permit the first and second callers to engage in a dispatch call and as the first caller has control over the first communications channel, transmitting (314) an interrupt message (505) over the second communications channel to inform the first caller of an interrupt status of the second caller. The transmitting step is performed without terminating the dispatch call.

Abstract: An electrical device comprises analog conversion circuitry having an input and an output. The electrical device is essentially provided for converting a first input signal within a first frequency range applied to the input to a first output signal within a second frequency range different from the first frequency range at the output. The electrical device further comprises a signal adding means for adding at least a portion of the first output signal as second input signal to the first input signal. The analog conversion circuitry is also capable of converting the second input signal, which is within the second frequency range, back to the first frequency range. Additionally, a characteristic deriving means is provided for deriving at least one characteristic of the electrical device from the frequency converted second input signal, which appears at the output of the analog conversion circuitry.

Abstract: Methods and apparatus for synchronizing Wireless Local Area Network (WLAN) communication within a multi-mode radio. A multi-mode radio can support communication with a WLAN and at least one other wireless communication system. The multiple systems can be distinct and asynchronous. Transmitting, or attempting to transmit, over a WLAN communication link can result in interference that degrades the sensitivity of a receiver in another communication system, or that interferes with a transmission in another communication system. The WLAN transmissions can be synchronized to operation in another communication system by generating a signal that can be coupled to a collision avoidance system in the WLAN transmitter. The signal can operate to cause the WLAN transmitter to reschedule the transmission to another time such that the resources of the multi-mode radio are conserved and the WLAN interference is minimized.

Abstract: In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, when transmission in a first mode is switched to transmission in a second mode or when transmission in the second mode is switched to transmission in the first mode, the output level of the power amplifier is lowered once to a predetermined level higher than the level when transmission related circuits are activated, and thereafter the output level of the power amplifier is again ramped after the settings have been changed but without starting of a transmission oscillator, establishing of the phase control loop and the amplitude control loop.

Abstract: Transmitter and receiver functionality are separated in dual-mode radio transceivers to support high-rate services. Transceivers with highly asymmetric requirements that need only a high-rate transmission or only high-rate reception functionality are supported by including a high-rate transmitter to support pushing data out or a high-rate receiver to support pulling data into the transceiver at high data rates.

Abstract: A transmitting and receiving arrangement is disclosed having a transmission path, a reception path, and a control device for suppression of interference signals which are produced by crosstalk from the transmission path to the reception path. The control device inputs correction signals that are derived from the transmission signals into the reception path at a point therein such that the interference signals are suppressed downstream from the point. The control device has a detector that detects the interference signals on the basis of characteristics of the transmission signals.

Abstract: A method for establishing a wireless communication interface between a call management device and a plurality of mobile communication devices is provided. The method comprises implementing an association between the call management device and each of the plurality of mobile communication devices; configuring the call management device as a primary device in a personal area network (PAN); and configuring each of the plurality of the mobile communication devices as a non-primary device in the PAN.

Abstract: A local area communication network in a distance of several to several tens of meters is disclosed. The local area communication network includes a personal area network (PAN) coordinator capable of performing sound and electric communications and controlling communication flow in the network, and at least one end device connected to the PAN coordinator through a sound and/or electric communication channel. The PAN coordinator includes a conversion means for performing mutual conversion between a sound communication protocol and an electric communication protocol, and can be connected to another external communication network.