Abstract: A method for broadcasting messages in an ad hoc wireless network having a tree-based architecture is provided. When a node receives a broadcast message for re-broadcasting to other nodes in the network, it builds a list of identifiers of other nodes in the network from which the node requires reception of a broadcast message as an implicit acknowledgment that said other nodes in the network have received said broadcast message. The node builds this implicit acknowledgment list based on stored data pertaining to an existing tree-based topology of the network. After this list is built, the node re-broadcasts the broadcast message. Each node in the network executes this broadcasting protocol and in so doing a broadcast message quickly and efficiently propagates through the network with minimal redundancy and impact on the topology of the network.

Abstract: A method for reusing wireless resources in a wireless network, includes determining the probability of a first communication with a first relay station experiencing interference from a second relay station. The method also includes, upon determining that the probability of experiencing interference from the second relay station is greater than an interference threshold: allocating a first wireless resource to the first relay station and the second relay station; designating the first wireless resource as a primary wireless resource for the first relay station; designating the first wireless resource as a secondary wireless resource for the second relay station; allocating a second wireless resource to the second relay station; and designating the second wireless resource as a primary wireless resource for the second relay station.

Abstract: A method and system for providing a watermark by amplitude modulating data onto signals being repeated from and/or to a cellular telephone handset without degrading the performance of the cellular telephone system. An exemplary cellular repeater system may include a first communication device configured to receive a cellular telephone signal from a handset. The cellular telephone signal is amplified by a variable gain amplifier configured to create an adjusted signal. The amplification factor applied by the variable gain amplifier is controlled by a message encoder configured in accordance with a predetermined encoding scheme. The adjusted signal is then transmitted to a base station by a second communication device.

Abstract: Multiple embodiments of systems for testing the delivery of satellite and cable television signals are described.

Abstract: Methods and apparatus for transmitting packets in wireless communication networks are disclosed. The methods include a relay mobile station measuring channel quality between the relay mobile station and a destination mobile station in response to a request for relay mobile stations from a base station The relay mobile station reports a channel quality indicator to the base station if the channel quality for a link between the base station and the destination mobile station via the relay mobile station is greater than a predetermined channel quality. The base station determines the relay mobile station that provides an optimal route for transmitting the packets from the base station to the destination mobile station.

Abstract: Information content is managed in a network-based communication system by providing a content management site accessible to a user of the system. The content management site is configured to permit the user to designate at least one data source that is external to the content management web site. A mobile web site is generated that is accessible independently of the content management web site via one or more mobile devices over a wireless network of the communication system, with the mobile web site being configured to receive data automatically from the external data source designated by the user at the content management web site.

Abstract: A GPS microphone, which is adapted for incorporating a communication system, includes a speaker-microphone set, a radio frequency transmitter communicatively networked with the communication system through radio frequency signals, and a GPS controller electrically connected with the radio frequency transmitter to encode a positioning data into a RF positioning signal in form of audio signal wherein when the GPS controller is triggered, the radio frequency transmitter is activated to transmit RF positioning signal to the communication system.

Abstract: A wireless communication method executed by a wireless communication system including a relay apparatus, a first wireless communication apparatus, and a second wireless communication apparatus includes the following operations. Upon receiving a wireless signal from the first wireless communication apparatus, the relay apparatus adds advice information, which indicates that the wireless signal has been relayed, to the received wireless signal. The relay apparatus transmits the wireless signal added the advice information thereto to the second wireless communication apparatus. The second wireless communication apparatus detects the advice information to determine whether the wireless signal has been relayed.

Abstract: A method of determining transmission timing in a relay station is provided. The relay station in a mobile communication system formed of the relay station and a base station generates a processing capability reporting message including information about the processing capabilities in a down link and an up link of the relay station and transmits the processing capability reporting message to the base station.

Abstract: A relaying method and system in a communication system having a Base Station (BS), a Mobile Station (MS) for communicating with the BS, and a Relay Station (RS) for relaying signals between the BS and the MS are provided. In the relaying method and system, the BS generates a BS pilot sequence and transmits the generated BS pilot sequence to the RS. wherein a partial cross correlation between the BS pilot sequence and an RS pilot sequence, being the BS pilot sequence relayed by the RS is always ‘0’. Accordingly, system capacity is more efficiently utilized.

Abstract: A communication apparatus, such as a GPS microphone, which is adapted for incorporating a communication system, includes a communication unit such as a speaker-microphone set, a communication transmitter such as a radio frequency transmitter communicatively networked with the communication system through radio frequency signals, and a positioning controller such as a GPS controller electrically connected with the radio frequency transmitter to encode a positioning data into a RF positioning signal in form of audio signal wherein when the GPS controller is triggered, the radio frequency transmitter is activated to transmit RF positioning signal to the communication system.

Abstract: Briefly, in accordance with one or more embodiments, a MIMO repeater turns off one or more transmitters of the MIMO repeater if there is no mobile station in the coverage area of the MIMO repeater to reduce noise enhancement on a MIMO network. If there is a repeater in the coverage of the MIMO repeater, the MIMO repeater turns off or keeps off its transmitters that do not have a sufficient channel quality in a respective antenna path, and turns on its transmitters having a sufficient channel quality in the respective antenna path transmits uplink signals from the mobile station via the turned on transmitters to further reduce noise enhancement by not using transmitters that do not significantly contribute to signal quality.

Abstract: Apparatus and method for performing Automatic Retransmission reQuest (ARQ) in a wireless relay communication system are provided, which include performing ARQ with the base station (BS), transmitting data successfully received from the BS to mobile station (MS), and retransmitting corresponding data to the MS when a retransmission indication message is received from the BS. Since the relay station (RS) relays only the errorless data to the receiver, the reliability of the data received at the receiver can be enhanced. The load on the RS can be reduced because the transmitter controls the ARQ.

Abstract: A system and method of applying a known modification in the form of a distortion to a signal to enable a determination if a signal received by a first node is received directly from a second node or indirectly through a repeater. The repeater receives a primary signal and creates a secondary signal as a function of the primary signal and a known distortion, wherein the known distortion identifies the repeater. The primary signal is transmitted and injected with the secondary signal as the first signal to the primary receiver.

Abstract: Provided is a rescue request signal processing device connected with a repeater and including a signal detector configured to detect identification information of a wireless communication terminal from an uplink signal outputted from the wireless communication terminal; a signal strength information generator configured to generate strength information of the uplink signal of the wireless communication terminal when the detected identification information of the wireless communication terminal is identical with identification information of a wireless communication terminal included in a request signal for location information transmitted from a location information requesting device; and a transmitter configured to transmit the strength information of the uplink signal and at least one of location information and identification information of the repeater to a location information server.

Abstract: A communication apparatus, such as a GPS-microphone, which is adapted for incorporating a communication system, includes a communication unit such as a speaker-microphone set, a communication transmitter such as a radio frequency transmitter communicatively networked with the communication system through radio frequency signals, and a positioning controller such as GPS controller electrically connected with the communication transmitter to encode positioning data into one or more RF positioning signals in form of audio signals wherein when the positioning controller is triggered, the communication transmitter is activated to transmit RF positioning signals to the communication system.

Abstract: A method and apparatus for determining whether a received signal is transmitted via a repeater is described. A source signal to be conveyed via a particular repeater may include, or be modified to include, a variety of signal characteristics having a predictable relationship that remains relatively constant, which may be taken together as a signature of the repeater. The signature may reflect a composite of distinct signals. A database of repeater signature references may be developed, and an adequate match between characteristics of an unknown received signal and such signature references indicates that at least part of the unknown signal is transmitted via a repeater. Useful signal characteristics for repeater signatures may include some representative of signal strength, and time of arrival information, among many other possibilities.

Abstract: A method for determining EIRP of user terminals in a satellite communications system comprises measuring a return uplink thermal noise at one or more frequencies, obtaining a target return uplink signal density relative to thermal noise density, and determining a target signal power at a gateway in the satellite communications system for one or more frequency channels. The target signal power may be based at least in part on the return uplink thermal noise and the target return uplink signal density relative to the thermal noise density. The method also comprises obtaining a message signal power at the gateway of one or more messages from a user terminal, and determining the EIRP of the user terminal based at least in part on a difference between the target signal power and the message signal power.

Abstract: A radio communication system includes at least one receive antenna for receiving communication signals, processing circuitry for processing the received communication signals and repeating the signals for further transmission, and at least one transmit antenna for transmitting the repeated signals. The processing circuitry is operable for receiving an input regarding the current geographic location of the communication system. The processing circuitry is further capable of recording measurements and data regarding the operation and use of the radio communication system and its operating environment including where and when the measurements and data were taken. The processing circuitry further provides a user interface and capabilities to analyze and visualize the recorded information to diagnose problems and optimize performance.

Abstract: Methods and apparatus for providing a Tactical Radio Relay System. One embodiment of the invention includes a constellation of miniature radio relays. These relays may be deployed on buildings or structures to provide a temporary telecommunications system that is capable of communicating with a base station or with mobile terminals. In an alternative embodiment, the relays include parachutes made from thin film batteries, and may be dropped over a target communications zone from an airborne platform.

Abstract: A method for determining a frequency correction and a symbol rate correction for transmissions from a user terminal in a satellite communications system comprises determining a frequency of a signal received at the user terminal, and determining a symbol rate of the signal received at the user terminal. The method also comprises computing an error associated with an oscillator at an outdoor unit of the user terminal, and computing an error associated with an oscillator at an indoor unit of the user terminal. The method also comprises computing a transmit frequency correction for the user terminal based on the error of the oscillator at the outdoor unit and the error of the oscillator at the indoor unit, and computing a transmit symbol rate correction for the user terminal based on the error of the oscillator at the indoor unit.

Abstract: Providing connections to terminals in an access node of a first network. A message is received in the access node from a terminal, the message including capability information of the terminal. The terminal is identified in the access node on the basis of the received capability information as an intermediary node capable of relaying traffic between the first network and a second network. Parameters for a connection between the access node and the terminal are determined in the access node on the basis of the identification of the terminal as intermediary node and used in establishing the connection between the access node and the terminal.

Abstract: An apparatus and method for simultaneous transmission scheduling in a multi-hop cellular system are provided, in which a base station presets simultaneous transmission relay station set information and transmits the simultaneous transmission relay station set information to relay stations managed by the base station, and an relay station receives the simultaneous transmission relay station set information from the base station, determines, upon receipt of a data frame from the base station, a state of the relay station preset in relation to a receiving relay station for the data frame by comparing an ID of the receiving relay station included in the data frame with the simultaneous transmission relay station set information, and operates according to the preset state.

Abstract: A relay node including one or more components configured to measure a signal strength of sounding reference signals (SRS) received from a mobile station, and in response to the signal strength being above a predetermined threshold, to transmit a first request to an access node. The first request is for the access node to associate the mobile station with the relay node.

Abstract: A relayed communication system including a supervising station and a plurality of communication stations, transmits data from the supervising station to the communication stations by relay transmission. Each of the plurality of communication stations determines the quality of communication with the supervising station, and notifies the determined communication quality to the supervising station. If the communication quality is equal to or greater than a predetermined value, the supervising station allocates one or more communication stations as relay stations to respective time slots in descending order of the communication quality, and transmits the allocation result to the plurality of communication stations. As a result, each communication station can perform relayed communication using the time slot that is allocated thereto.

Abstract: A communication relay method of a communication relay apparatus in a multi-mode wireless environment includes: sensing a wireless access environment of a terminal based on an object sensing function; deciding whether or not to provide a predetermined communication relay service to the terminal; and deciding an operation network which is to provide the predetermined communication relay service.

Abstract: A determination of link quality (CSR) is made from the subscriber station to a relay station. A determination of link quality (CRB) is made from the relay station to the base station, and a determination of link quality (CSB) is made from the subscriber station to the base station. A quality of a first link path from the subscriber station to the base station that passes through the relay station is determined based on at least the link qualities (Csr, Crb). A quality of a second link path from the subscriber station to the base station that does not pass through the relay station is determined based on at least the link quality (Csb). Finally, a determination is made whether to utilize the first link path or the second link path from the subscriber station to the base station based on at least the quality of the first and second link paths.

Abstract: The present invention provides a measurement method in a cell handover procedure, comprising: A. after network measurement is triggered, a base station schedules resources, which are needed for transmitting uplink data, for a user terminal; and B. the base station and relay stations measure relevant data transmitted from the user terminal on the resources scheduled by the base station, and the relay stations report the detection information of the uplink signal derived from the measurement to the base station. A relay station and a base station for realizing cell handover are also provided. The present invention can realize that during measuring the quality of the signal from a user terminal and a network side, the network performs the measurement, and selects a target node to which the user terminal will handover according to the result of the measurement.

Abstract: Methods, systems and apparatus for ground-based beamforming of a satellite communications payload (200) within a satellite communications network (100). An embodiment of the invention comprises a satellite (11) communicatively coupled to at least one gateway (12) via a feeder link (13) and a plurality of user terminals (16), each communicatively coupled with the satellite by a user link (17) where a ground based beam forming system (400) receives, via feeder link (13), return path signals (452) traveling from the user terminals (16) via the satellite (11) to the at least one gateway (12) and forward path signals (457) traveling from the at least one gateway (12) via the satellite (11) to the user terminals (16), and measures and corrects amplitude and phase errors of the return path signals (452) and the forward path signals (457).

Abstract: A broadcast message transmission method of a relay station in a multi-hop relay network, which can be applied to a non-transparent centralized scheduling multi-hop relay network, includes that a base station transmits a message to be broadcasted to the relay station, the relay station returns an acknowledgement header to the base station after it has received the message, the base station transmits a message indicating the bandwidth allocation of the downlink to the relay station periodically after it has received the acknowledgement header for indicating the downlink bandwidth that the base station initiatively allocates to the relay station, and the relay station transmits broadcast messages to a terminal or a lower relay station in the downlink bandwidth.

Abstract: A vehicle monitoring system which may easily identify information transmitted from each of detecting devices without registration of identification information of the detecting devices and a transponder thereof are provided. A display is disposed in a distal end of the transponders all connected in series through a cable. Each of the detecting devices detects conditions in a predetermined portion of a vehicle and transmits vehicle information including measurement results, its own identification information and the number of transmissions. Each of the transponders determines whether the vehicle information transmitted from the detecting devices is received or not based on the identification information of the detecting devices registered in advance, and transmits the vehicle information to the transponder connected to the transmitting side or the display, when it determines that the vehicle information is to be received.

Abstract: A method for controlling gain in a wireless repeater includes computing a gain control metric indicative of a loop gain of the repeater and detecting changes in a signal power of a gain control input signal where the gain control input signal is taken from any point in the feedback loop of the repeater. When a large power swing in the gain control input signal is detected, the method operates to discard at least a portion of each gain control metric measurement for a first duration before continuing with computing the gain control metric. In another embodiment, the method may include discarding samples of the gain control input signal used in computing the gain control metric for a first duration when a large power swing in the gain control input signal is detected.

Abstract: A method for monitoring feedback loop stability in a wireless repeater includes measuring a gain control metric in the feedback loop of the repeater periodically for a given time period where the gain control metric is indicative of a loop gain of the feedback loop of the repeater; and monitoring the magnitude of the gain control metric to determine the stability of the feedback loop of the repeater. In operation, a large magnitude of the gain control metric indicates instability in the feedback loop of the repeater.

Abstract: A method for controlling gain in a wireless repeater includes using two or more gain control metrics indicative of stability of the repeater, at least two of the gain control metrics having different integration lengths, where the integration length is the sum of the coherent integration time and the non coherent integration time, and controlling a variable gain value of the repeater based on one or more of the selected gain control metric(s) where the gain control metric(s) to use is selected based on the stability of the repeater.

Abstract: A wireless repeater includes a channel estimation block to estimate a feedback channel between the antennas of the repeater using frequency domain channel estimation. The repeater includes a pilot signal blanking circuit to blank out a selected number of samples of the pilot signal to improve the accuracy of the channel estimation. In another embodiment, the repeater replaces T samples of the pilot signal with a cyclic prefix.

Abstract: A method for controlling gain in a wireless repeater includes providing one or more gain control metrics where the gain control metrics is indicative of a loop gain of the repeater; measuring the one or more gain control metrics; and adjusting a variable gain of the repeater using a gain adjustment step size being a function of at least the loop gain of the repeater as measured by the one or more gain control metrics. In another embodiment, the gain control algorithm block is configured to divide the loop gain of the repeater into multiple gain adjustment control zones. The gain adjustment control zones may include a first zone having a loop gain in a stable operating region and a second zone having a loop gain outside the stable operating region.

Abstract: A system and method of applying a known modification in the form of a distortion to a signal to enable a determination if a signal received by a first node is received directly from a second node or indirectly through a repeater. The repeater receives a primary signal and creates a secondary signal as a function of the primary signal and a known distortion, wherein the known distortion identifies the repeater. The primary signal is transmitted and injected with the secondary signal as the first signal to the primary receiver.

Abstract: A relay transmission method for communication between a base station and a mobile station via a relay station while producing a diversity effect even if the relay station detects an error in the relay signal. A decoding section (104) of the relay station used in this method performs error-correction decoding of a systematic bit by using a parity bit by repetition decoding such as turbo decoding and acquires the results of the decoding composed of the systematic bit having undergone the error-correction decoding. An error judging section (105) judges whether or not any error is present in the decoding results. Coding section (106) performs error-correction coding of the decoding results and acquires the error-correction coded systematic bit and parity bit.

Abstract: A method and apparatus of accessing to a network node in a wireless communication system is provided. A relay node (RN) determines whether an access to a network node is allowable. The RN attempts to access to the network node if it is determined that the access to the network node is allowable. Service delay due to access failure can be prevented.

Abstract: A communication device that may select a relay node from a plurality of relay nodes, and be used as a signal receiving node through the selected relay node is provided. Additionally, a relay device that may be used as a relay node to receive and broadcast signals is provided.

Abstract: The present invention provides a radio system and a method for relaying radio signals. The radio system and the method provide a calibration of transmit radio signals in which no dedicated calibration signal generator is required for calibrating the radio system. The radio system comprises at least one transmit path, a calibration unit at the least one link. A coupled transmit signal is is extracted from the transmit paths and selectively forwarded as a feedback signal to a feedback signal demodulator. The feedback signal demodulator generates a base band feedback signal adapted for updating phase and amplitude changes applied a calibrated payload signal.

Abstract: The present invention provides a radio system and a method for relaying radio signals, providing a power calibration of transmit radio signals. With the radio system and the method no dedicated calibration signal generator is required for providing the power calibration of the transmit radio signals. The radio system comprises at least one transmit path, a calibration unit at the least one link and a power sensor. A selected one of coupled transmit signals is forwarded to a power sensor for measuring a power level of a portion of the selected one of the coupled transmit signals, wherein the calibration unit is adapted to update a power rating of the at least one transmit path in response to the transmit power level of the selected one of the coupled transmit signals.

Abstract: The present invention relates to a system and method of reusing radio resources capable of improving radio resource efficiency. According to an embodiment of the present invention, in a communication system including a repeater that retransmits signals transmitted from a satellite to user terminals, it is possible to reuse some of the radio resources used in a wide area coverage, such as the satellite, in a repeater coverage. Therefore, it is possible to ensure radio resources such that repeater data can be transmitted to user terminals without additional radio resources.

Abstract: A test device includes a microprocessor and a switching network comprising a plurality of coaxial switches. The test device includes a signal booster, an uplink antenna and a downlink antenna, and a diagnostic device. A power source supplies power to the signal booster and the diagnostic device. The microprocessor controls the switching network which, in turn, controls the interconnection of the power source, the signal booster, the uplink and downlink antennas, and the diagnostic device.

Abstract: A method for measuring a self-interference (SI) which occurs in a relay and controlling radio resources of a base station based on the measured SI, and a mobile telecommunication system using the same. The mobile telecommunication system includes a relay which calculates intensity of SI; and a base station which performs radio resource management based on the calculated SI intensity. The method for measuring SI includes calculating intensity of SI using a relay; and performing radio resource management at a base station based on the calculated SI intensity.

Abstract: A communications system (30) enables two communications devices (10, 12) to communicate with each other over an extended distance using a limited range communication protocol, such as the IrDA or Bluetooth protocol. The communications system includes a pair of repeaters (32, 34), each having a protocol stack (38) that includes a portion of the limited range communications protocol. The repeaters communicate with each other over an extended range communications channel (36) such as the PSTN, while each communications device utilizes its native, limited range communications technique to communicate with an associated repeater. Thus, each communications device can readily communicate with another like device using its native protocol over a distance otherwise beyond the range of that technique.

Abstract: A GPS-microphone, which is adapted for incorporating a communication system, includes a speaker-microphone set, a radio frequency transmitter communicatively networked with the communication system through radio frequency signals, and a GPS controller electrically connected with the radio frequency transmitter to encode positioning data into one or more RF positioning signals in form of audio signals wherein when the GPS controller is triggered, the radio frequency transmitter is activated to transmit RF positioning signals to the communication system.

Abstract: A telecommunications chassis, module, and repeater circuit for use with signals having data rates including STM-1 (155.52 megabits per second) are disclosed. The chassis provides structures for establishing shielding and heat dissipation for the circuitry modules it contains including an outer and an inner Faraday box with an integrated ventilation pattern for circulating air. The module provides its own structures for establishing shielding and heat dissipation including a Faraday box and a ventilation pattern. The repeater circuit provides the ability to bridge a data signal between a monitor jack of one device and a higher signal level input jack of another device through multiple amplification stages and circuit board structures. The telecommunications chassis, module, and repeater circuit can be used in conjunction.

Abstract: A wireless repeater configured for implementation in a wireless communication system is disclosed. The repeater can be configured to receive and rebroadcast communications using various types of airlinks in a wireless communication system. The wireless repeater can include a receiver configured to sense the type of airlink being supported by the repeater. The repeater can then selectively apply a repeater identifying watermark to a signal based on the type of airlink. The repeater may be configured to periodically scan an operating bandwidth for supported airlinks and can configure the watermarking applied to signals within the channels based on the detected airlinks.

Abstract: A data relay apparatus includes a first demodulating unit, demodulating a modulation signal of a first modulation mode from a first transmission source; a second demodulating unit, demodulating a modulation signal from a second transmission source, having a modulation mode higher than the first modulation mode; a combination controlling unit, providing a mapping rule necessary for performing signal combination in accordance with the modulation mode of the modulation signal from each of the first and second transmission source, the mapping rule to map the demodulated modulation signal from the first transmission source together with the demodulated modulation signal from the second transmission source to a constellation of symbols of the second modulation mode; a data combining unit, performing data combination on the demodulated modulation signal from the first transmission source and the demodulated modulation signal from the second transmission source according to the mapping rule.