Abstract: A communication apparatus is provided in which only a terminal having a specific positional relationship can perform communication through a relatively simple arrangement. When initial setting is performed or communication is started, a timing calculator calculates a time difference corresponding to the difference between a path from a first antenna to a terminal and a path from a second antenna to the terminal, based on a transmission signal from the first antenna and a reflection signal provided by having the transmission signal reflected from the second antenna or a communication partner, i.e. the terminal, and returned back to the first antenna. Based on the time difference thus calculated, the timing calculator outputs a signal for regulating the transmission timing of transmission data from the first antenna to a variable delay unit.

Abstract: A method for operation of a node operating in a wireless network comprising the steps of during an initial phase, setting transmission power and data transmission rate to initial settings and transmitting the initial settings to the wireless network in order to initiate communication with said wireless network during a reference phase once communication with the wireless network is established by the initial phase, transmitting at maximum power while performing a rate adaptation and at least one variable estimation and during an operational phase, transmitting at a power level that is optimal for transmission based on information obtained from the reference phase.

Abstract: The present invention provides a method of operating a base station transmitter. In one embodiment, the method includes providing a cellular downlink synchronization signal having primary and secondary portions, wherein the primary portion is common for all cells and the secondary portion is cell-specific and transmitting the cellular downlink synchronization signal. In another embodiment, the method includes providing a cellular downlink synchronization signal having primary and secondary portions wherein the primary portion employs a corresponding one of a plurality of different primary signals allocated to adjoining transmission cells. The method also includes further providing cell-specific information in the secondary portion and transmitting the cellular downlink synchronization signal. The present invention also provides a method of operating user equipment.

Abstract: Provided are an apparatus and a method for downloading Subscriber Identity Module (SIM) data in a mobile communication system, which includes an authentication server that stores authentication information and a list of registered networks; a service provider server that stores SIM data and transmits the SIM data in response to a request for the SIM data; and a mobile communication terminal that receives user authentication from the authenticating server, checks the list of the networks, allows a network, which is to be accessed, to be selected from among the list of the networks, and accesses the service provider server in the selected network so as to download the SIM data.

Abstract: The present invention discloses a tagging and identification device and system for tracking and monitoring sea vessels as they enter sea ports, estuaries and/or other channels. The tagging device of the present invention comprises a receiver, for receiving an underwater electromagnetic signal transmitted by an underwater beacon. An acoustic transmitter is provided for transmitting an identification signal to an acoustic receiver deployed nearby. The acoustic identification signal is transmitted after an electromagnetic trigger signal is received from the underwater beacon. The tagging and device may further comprise a memory device which can store data relating to position and time of the see vessel to which it is attached. The tagging and identification device of the present invention is covert, compact and is capable of extended active deployment without replenishment of batteries etc.

Abstract: The invention concerns a method for receiving a multi-carrier signal of reduced complexity when the number of carriers is not high. The method includes: demodulating the multi-carrier signal; converting a received signal received in binary representation into a modal representation in a base of at least two mutually prime numbers on a finite space of size equal to the product of the mutually prime numbers; demodulating including conversion.

Abstract: The invention relates to a method and system for calibrating the transmission and/or reception of at least one mobile radio device wherein a respectively defined number of test signal reference level values in predetermined for the mobile device(s) for a specific number of frequencies of a test signal. The mobile radio device(s) track(s) the real generated and measured level values of the test signal to the respectively associated reference values of all tracings of the real received level values to the associated reception reference values are directly sequential by virtue of full specification of all frequencies and reference level values associated with each frequency to the mobile radio device(s) prior to the beginning of all measurements.

Abstract: A method of operating a wireless mesh network comprises generating a pseudorandom sequence element in a transmitting device and a receiving device of the network using information shared by the transmitting and receiving devices. The pseudorandom sequence element is then used to calculate a communication channel/timeslot assignment for communication between the transmitting wireless device and the receiving wireless device.

Abstract: The invention provides a method of generating a downlink signal and searching a cell on the basis of the downlink signal in an OFDM-based cellular system. The downlink signal includes a plurality of synchronization blocks each having a plurality of sub-frames, and a synchronization pattern composed of a combination of a cell group identification code for identifying a cell group and a frame synchronization identification code for indicating a frame start point is generated in each of the synchronization blocks. Different frame synchronization identification codes are allocated to the synchronization blocks.

Abstract: Methods and apparatus for selecting samples for secondary synchronization signal (SSS) detection are described. Several alternatives are provided for efficient cell identifier detection. In a first alternative, multiple bursts of a signal received from a cell are sampled with non-uniform spacing between sampling intervals to determine a sequence for cell identification. In a second alternative, samples of a first and a second signal received from a stronger cell are cancelled, and a sequence for detecting a weaker cell is determined by reducing effects of the samples of a third signal received from the weaker cell which do not overlap with the primary synchronization signal (PSS) or SSS of the stronger cell. In a third alternative, a sequence for detecting a weaker cell is determined by reducing effects of any sampled bursts that correspond to a high transmission power portion of a signal from a stronger cell.

Abstract: A processing unit generates timing information on timing, with which each of radio apparatuses is to synchronize in communication between the radio apparatuses when each of the radio apparatus broadcasts a signal, to control the communication between the radio apparatuses. A modem unit and the like broadcast the thus generated timing information. An RF unit and the like receive a signal which is synchronous with the timing information broadcast by them. When a signal which is asynchronous with the timing information and when the duration of this signal continues for a period longer than a first threshold value and the quality of this signal is more deteriorated than a second threshold value, a decision unit detects that the received signal is a disturbing signal. The modem unit and the like also broadcast to the effect that the disturbing signal has been detected.

Abstract: A method of calculating local time, in an intelligent network, of a subscriber's User Equipment (UE), determines whether a call originates or terminates with the UE, the UTC offset and DST observance indicator for the (G)MSC signaling the intelligent network, and a determination is of whether the UE is in a Problem Area cell site. If the UE is in a Problem Area cell site, the received time and Coordinated Universal Time (UTC) Offset is corrected. A Cell Global Identity (CGI) is used to lookup the UTC Offset and a Daylight Saving Time (DST) observance indicator for the Cell Site. For calls terminating with the UE, if the UE is not in a Problem Area cell site, the VLR serving the UE is used to lookup the UTC offset and DST observance indicator for the subscriber. A time zone delta is applied to the call time of day and the UTC Offset and if DST is in effect, and there is a difference of DST between an MSC serving the UE and the location associated with the UE, a DST delta is applied to call time of day.

Abstract: A channel search method for a vertical handoff in a wireless network environment is provided, the channel search method including: collecting channel information from a first terminal which is provided with a wireless local area network (WLAN) service via a channel connection with a WLAN node; and determining a channel search order for a channel connection between a second terminal and the WLAN node by using the collected channel information. A channel search system for a vertical handoff in a wireless network environment is also provided, the channel search system including: a channel information collection unit for collecting channel information from a first terminal which is provided with a WLAN service via a channel connection with a WLAN node and a search order determination unit for determining a channel search order for a channel connection between a second terminal and the WLAN node by using the collected channel information.

Abstract: Methods and apparatus for gathering information about the eye of a high-speed serial data signal include sampling each bit of a repeating, multi-bit data pattern at several eye slice locations. For any given eye slice location, each bit in the data pattern is compared in voltage to a base line reference signal voltage to establish a reference value for that bit. Then the reference signal voltage is gradually increased while the voltage comparisons are repeated until for some bit a result of the comparing is different than the reference value for that bit. This establishes an upper value for the eye at the eye slice location. The reference signal voltage is then gradually decreased to similarly find a lower value for that eye slice.

Abstract: According to the present invention, Bluetooth master device offset information is determined and distributed among the master devices within a Bluetooth network. The system either provides an offset to each master device or determines master device offsets and distributes this information to master devices within the system to allow or efficient hand-offs of a slave between master devices.

Abstract: A digital broadcast transmitting/receiving system and a signal processing method thereof that can improve the receiving performance of the system. A digital broadcast transmitter has a randomizer to randomize an input data stream which has null bytes being inserted at a specified position, a multiplexer to output a data stream formed by inserting specified known data into the position of the null bytes of the randomized data stream, an encoder to encode the data stream outputted from the multiplexer, and a modulator/RF-converter to modulate the encoded data, RF-convert the modulated data and transmit the RF-converted data. The receiving performance of the digital broadcast transmitting/receiving system can be improved even in a multi-path channel by detecting the known data from the received signal and using the known data in synchronization and equalization in a digital broadcast receiver.

Abstract: A method for wireless communication between a base station and a number of devices is provided, with the devices in each case having a limited energy supply. To establish a connection, the base station sends a sequence of synchronization signals on at least one of its communication channels. The devices in each case listen on their parameterized or unparameterized communication channel within a listening period, which is repeated with a repetition frequency that can be set. Outside the listening period, the device in question is set to an energy-saving mode. The length of the listening period, the repetition frequency and the energy consumption in the energy saving mode are synchronized with each other in such a way that the energy consumption up to the connection setup averaged over time does not exceed the energy consumption during normal operation of the device.

Abstract: A communication device that includes a femtocell base station and a mobile station transmitter/receiver. The femtocell base station may provide bidirectional internet protocol (IP) communication for one or mobile devices to a cellular network. The femtocell base station may be operable to communicate with the cellular network using a wide area network. The mobile station transmitter/receiver may be coupled to the femtocell base station (in a same housing). The mobile station transmitter/receiver may be operable to perform radio frequency (RF) wireless communication with the cellular network, e.g., to detect and/or report environmental parameters, performing testing (e.g., loopback testing), and/or provide communication for the one or more mobile devices (e.g., when the wide area network is down), among others.

Abstract: Techniques for updating databases stored on mobile devices.

Abstract: An intermediate station and method for facilitating handover in a multi-hop communications system is disclosed. The method may include receiving a handover trigger, finding a target station to receive handover, determining whether the handover requires a timing change, wherein if it is determined that a preamble and broadcast timing change for one or more downstream stations is required, estimating when the handover will take place, instructing the one or more downstream stations to resynchronize, and performing the handover to the target station.

Abstract: A method for determining a transmission timing is provided. The method includes steps of, at a first point in time, determining a first transmission timing for transmissions from a user entity to a first radio transceiver, and determining a representation of a first position of the user entity in relation to the first radio transceiver and at least a second and a third radio transceiver. The method further includes, at a second point in time, subsequent to the first point in time, determining a representation of a second position of the user entity in relation to the first, second and third radio transceivers, and adjusting the transmission timing based on a difference of the first position and the second position.

Abstract: A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for the Sync Channel transmission instead of the preferred channels for the entire multi-carrier system. The Sync Channel Message will carry additional information indicating the center frequency of a multi-carrier system within a reserved set of frequency bands and indicating the frequency of a single carrier system in the reserved set of frequency bands. Considering the A block of the PCS band again, the preferred channels for Sync Channel transmission can be selected as channels 75, 150 and 225. This selection ensures that one of the preferred channels will always be used by any multi-carrier system regardless of the location of its center channel.

Abstract: A method of synchronizing with an uplink channel and a method of determining a propagation delay in a wireless communications system are provided. In the example method of synchronizing, a propagation delay between a target base station and a mobile station is calculated. Then, the calculated propagation delay is sent to the target base station. In the example method of determining a propagation delay, a first signal is received indicating a first measured chip offset between a downlink channel of a serving base station and a pilot signal of the target base station. A second signal indicating a second measured chip offset between an uplink channel of the mobile station and a pilot signal of the target base station is then received. A propagation delay between the target base station and the mobile station is calculated based at least in part on the first and second measured chip offsets.

Abstract: A system and method for enabling functions on a primary mobile device from a secondary mobile device are described. The primary mobile device is configured to enable at least selected functions of the mobile communications device if authorization information is received at the primary mobile device at periodic intervals of time. The method comprises: storing at the secondary mobile device the authorization information; establishing a short range direct wireless communications link between the secondary mobile device and the primary mobile device; and periodically transmitting the authorization information to the primary mobile device to enable the at least selected functions of the mobile communications device.

Abstract: A method of operating a communication system is disclosed. The method includes receiving a first location information related to a geographic location of a wireless communication device and a second location information related to a geographic location of an access node, processing the first location information and the second location information to determine a distance between the wireless communication device and the access node, processing the distance to determine a first delay metric, wherein the first delay metric indicates a first time delay associated with a wireless link between the access node and the wireless communication device, and processing the first delay metric to determine if the first delay metric exceeds a threshold delay.

Abstract: The present invention refers to generating of cooperation areas in a communications network, wherein each cooperation area is defined by at least two base stations of said communications network, which are cooperating when communicating with mobile nodes in said communications network. In particular, a number of sets of possible interferers is transmitted to at least one mobile node by a base station, wherein with each set of possible interferers an index value associated to said set of possible interferers is transmitted. Then, said mobile node selects a set of possible interferers from said number of sets of possible interferers and transmits a selected index value to said base station, said selected index value being an index value associated to said selected set of possible interferers. Hereupon, a cooperation area for said mobile node is defined by said base station by use of said selected index value.

Abstract: A communication control technique that makes it possible to avoid interference with another wireless communication system. To realize this technique, a tributary station according to the present invention transmits a beacon in an asynchronous BP after being started up, thereby determining whether or not another wireless communication network has received that beacon, and in the case where it has been determined that the other wireless communication network has received the beacon, the tributary station decreases its transmission power until the beacon is no longer received by the other wireless communication network.

Abstract: Methods and apparatus for determining at least part of the width of the eye of a high-speed serial data signal use clock and data recovery circuitry operating on that signal to produce a first clock signal having a first phase relationship to the data signal. The first clock signal is used to produce a second clock signal whose phase can be controllably shifted relative to the first phase. The second clock signal is used to sample the data signal with different amounts of phase shift, e.g., until error checking circuitry detects that data errors in the resulting sample exceed an acceptable threshold for such errors. The amount(s) of phase shift that caused exceeding the threshold can be used as a basis for a measurement of eye width.

Abstract: Aspects of the invention include a root node of a wireless communication infrastructure that buffers data packets for transmission by base stations over an air interface. The root node determines a time delay for transmission of a data packet from the root node to each base station, a maximum time delay of those time delays, and a timing latency based upon the maximum time delay. The root node transmits the timing latency to the base stations. In response, each base station initiates transmission of data packets received by the root node after expiration of the timing latency. Alternatively, the root node, instead of the base stations, may buffer the data packets, and transmit them so that they arrive at the base stations at substantially the same time.

Abstract: A system and method for determining a signal propagation delay between a transmitter and a receiver, and for adjusting a transmission time based on the propagation delay. A central station inserts a marker into a transmitted signal at a time corresponding to a received timing signal. The MCT receives the signal from the central station and determines a time difference between receipt of the marker and the detection of the time interval event. A transmission by the MCT is adjusted by an amount of time proportional to the time difference.

Abstract: Systems and methods are provided for processing wireless signal components for a mobile wireless access broadband service. This can include processes for measuring signal strength of an alternative frequency by tuning away from an existing frequency associated with an existing communications path. Such processes allow determining if the alternative frequency supports a subsequent communications path in a mobile broadband wireless application. Upon the determination, the process can automatically select the subsequent communications path based in part on the measured signal strength.

Abstract: Provided is a link synchronization method for a radio frequency repeater that can perform link route switching at an accurate time point by measuring reception signal power at a predetermined period for a predetermined time duration, accumulating and comparing them with a reference level, and detecting a link termination time point. The method includes: a) setting up an initial link route; b) measuring received signal power in the initial link route; c) accumulating the reception signal power received for a predetermined time at a predetermined period, when the reception signal power is detected; d) setting up a reference level for link switching based on the accumulated reception signal power; e) detecting a link termination time point by finding an edge in a waveform of the accumulated reception signal power based on the reference level; and f) switching the current link route based on the detected link termination time point.

Abstract: A mobile user terminal (UE), which measures downlink channel quality, and which transmits downlink quality information indicating the measured downlink channel quality and an uplink pilot signal to be used for measuring uplink channel quality to a base station (BS), comprises a transmit time control unit (216), which synchronizes transmit time of the downlink quality information and transmit time of the uplink pilot signal relative to each other. And/or the mobile user terminal (UE) comprises a radio transmitting unit (212) which transmits the downlink quality information and the uplink pilot signal by using the same carrier frequency or by using adjacent carrier frequencies selected from among a plurality of preassigned carrier frequencies.

Abstract: A receiving apparatus includes a first receiver, a second receiver, a received signal synthesizer connected to the first and second receivers, a synchronizing signal synthesizer connected to the first and second receivers, and a synchronization detector connected to the synchronizing signal synthesizer. In this structure, synchronization determination is performed using a synchronizing signal of either the first or second receiver, and diversity reception is performed using the received signals of the first and second receivers.

Abstract: A method and apparatus for allocating frequency resources for peer to peer (P2P) communication between terminals without a base station are provided. The method determines resources used for a direct communication between two terminals in a communication system. The method includes determining uplink frequency resources of a cellular communication system for use in the direct communication between the two terminals, determining a primary maximum transmission power to minimize interference caused by the direct communication on the cellular communication system and performing the direct communication between the two terminals by using the uplink frequency resources and a transmission power less than the determined primary maximum transmission power.

Abstract: An underwater remote sensing system comprising a transmitter for transmitting an electromagnetic signal, a receiver for receiving an electromagnetic signal reflected from an object and determining means for determining the location of the object, wherein at least one of the transmitter and receiver is underwater. The determining means may be operable to determine the location of the object using signals received at three or more receiver positions. To do this, three or more receiver antennas may be provided. Alternatively, a single receiver antenna may be provided and moved between three or more different measurement locations.

Abstract: A system to distribute accurate time and/or frequency over a network utilizing signals of opportunity transmitted by one or more local transmitters with known locations, the system includes a base receiver with a clock synchronized to a reference time scale such as GNSS or UTC time that saves a series of samples of the signals of opportunity and time tags the series with a calculated time of broadcast. A remote receiver saves samples of the signals of opportunity and correlates the series with the saved samples. The remote receiver calculates a time of transmission of saved samples that correspond to the series, determines a time offset as a difference in the time of broadcast calculated at the remote receiver and the time of broadcast calculated at the base receiver, and determines the time offset with respect to the base receiver.

Abstract: Opportunity of enjoying video and music is enlarged. A content reproducing device is used in a contents exchange system including a plurality of contents reproducing devices. The content reproducing device includes a short range communication unit, a memory, a control unit, and a speaker. The short range communication unit communicates request information, response information, content data and flag information to/from content reproducing devices. The control unit controls the short range communication unit so that content data is transmitted. The control unit controls the memory such that the content data and the flag information received by the short range communication unit are stored.

Abstract: A method of processing data comprises the receiving a frame of data having a predetermined number of time slots (502,504,506). Each time slot comprises a respective plurality of data symbols (520). The method further comprises a primary (508), a secondary (510) and a tertiary (512) synchronization code in each said predetermined number of time slots.

Abstract: A group communication method capable of performing group communication without additional functions provided on a network and with preventing excessive network traffic. Each communication device first transmits an enrollment message. A providing device groups the communication devices, creates a group key specifying the communication devices that are identified as a same subgroup, and transmits the group key to the communication devices. The communication devices receive and store the group key. To transmit distribution data to a subgroup, the providing device transmits the data together with data corresponding to the group key to a selected communication device of the subgroup. When the communication devices recognize the distribution data, the communication devices determine whether to receive the distribution data, based on the distribution data and the stored group key.

Abstract: There is provided a communication control technique in which it is possible to avoid interference with another wireless communication system. This invention is characterized by a control station which controls wireless communication of dependent stations. When a dependent station newly starts, the control station determines whether a beacon transmitted by the dependent station is received by another wireless communication network. When determining that the beacon is received by the other wireless communication network, the control station instructs the dependent station to lower the transmission power until the beacon is not received.

Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.

Abstract: A terminal station radio communication device belongs to a second radio communication system which shares a frequency channel with a first radio communication system in which a radio terminal station communicates with a radio base station in a predetermined time period using a predetermined frequency channel. The terminal station radio communication device includes: a transmission power determining unit which sets up signal transmission power, the signal transmission power being usable for communications between radio communication devices belonging to the second radio communication system, and being determined such that reception power at the radio base station is below a predetermined threshold; a synchronizer enabling the radio terminal station to obtain timing information to start signal transmission; and a signal transmitter starting transmitting the signal at the timing represented by the timing information and terminating the signal transmission within a predetermined time period.

Abstract: A receiver is tuned to a transmission frequency of a data signal after the receiver has already locked onto a frequency carrying the data signal. A frequency offset between a locked frequency of a tuner on the receiver and the actual transmission frequency is determined by a comparator. If the frequency offset is greater than a threshold value, then the tuner is stepped to another frequency and the frequency offset is determined again. The direction of the tuning step can be determined by comparing multiple frequency offsets. An average value of multiple frequency offset measurements may also be used to determine if the tuner should retune to another frequency by comparison with the threshold value.

Abstract: A cellular mobile communication system, in which a plurality of base stations communicate with mobile stations, provides a retrieval unit, in which each base station retrieves the information regarding the radio communication status of each base station communicating with the predetermined mobile station, a decision unit, which makes a decision as to whether or not to permit interstation-cooperated communication with each base station based on the information, and a determination unit which determines the communication method adopted in the mobile station based on the decision result.

Abstract: The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that will minimize the probability of interfering with existing legacy users. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at a multiplicity of transceivers in a wireless network.

Abstract: A method for supporting a Peer-to-Peer (P2P) communication in a wireless communication system is provided. The method includes identifying whether a Mobile Station (MS) is in a wireless communication active state, a P2P active state, or a P2P previous active state, and transiting to the P2P active state if a P2P connection request occurs in the P2P previous active state and transiting to the P2P previous active state if a P2P communication termination occurs in the P2P active state.

Abstract: A system and method for flexible data provision to mobile communication devices, which enables the user to selectively download data to the mobile communication device from a remote computer. The selective data download may optionally apply to one or more of a single item of data, to multiple items of data, one or more categories of data and the like. Preferably, the user interface provided through the remote computer comprises a mark-up language document, such as a Web page for example.

Abstract: A multicarrier communication apparatus that is capable of suppressing interference of feedback information with other channels and alleviating a reduction in an uplink capacity. In PL signal reception section (260) of this apparatus, PL signal extraction section (261) extracts pilot signals and reception quality measuring section (262) measures reception quality such as an SIR. Here, since pilot signals are included in respective subcarriers, reception quality measuring section (262) measures reception quality of subcarriers. FBSC determining section (270) determines a feedback information subcarrier based on the reception quality of subcarriers. More specifically, FBSC determining section (270) determines a subcarrier having the highest reception quality as a feedback information subcarrier. FBSC determining section (270) outputs information about the feedback information subcarrier (FBSC information) to control CH transmission section (110) and FB information reception section (250).

Abstract: A data transmission process with auto-synchronised correcting code, auto-synchronised coder and decoder, corresponding transmitter and receiver. According to the invention, synchronisation management signals (HS, SS, ID) are formed and, under the control of these signals, a header is inserted before a data group and after it a correcting code. At receive end, these synchronisation management signals are reconstituted, the presence of a header is detected and any erroneous symbols are corrected. The invention also provides for an auto-synchronised coder and a decoder and for a transmitter and a receiver using them.