Abstract: Provided is a method of assigning a frequency channel using efficient spectrum sensing in a multiple Frequency Assignment (FA) system.

Abstract: An apparatus and a method for switching to a channel including good receiving sensitivity among a plurality of channels for the same broadcast service are provided. The apparatus includes a radio broadcast receiving unit for receiving a radio broadcast, a display unit for indicating an existence of another frequency channel, through which it is possible to listen to a current broadcast, and a control unit for notifying a user of the existence of the other frequency channel if the other frequency channel exists for listening to the current broadcast service, and for switching a current channel to the other frequency channel to listen to the broadcast service through the other frequency channel if the other frequency channel is selected.

Abstract: Systems and methods for network entry management are provided. The system includes a base station and a mobile station. The base station broadcasts synchronization channels (SCH) on multiple carriers, where the SCH may be hierarchical synchronization channel composed of primary synchronization channel (P-SCH) and secondary synchronization channel (S-SCH) which are used for timing, frequency synchronization, cell identification, etc. The carriers include at least a first carrier including at least one P-SCH and do not include a S-SCH. The mobile station scans the first carrier, and checks whether a P-SCH is broadcasted on the first carrier. If a P-SCH is broadcasted on the first carrier, the mobile station checks whether an S-SCH is broadcasted on the first carrier. If no S-SCH is broadcasted on the first carrier, the mobile station scans for a second carrier broadcasted by the base station.

Abstract: Process for computing an estimation of the frequency offset in a receiver for a UMTS communication network said receiver receives the signal transmitted by two antennas and including two Common Pilot CHannels (CPICH), said process involving the steps of separating the two signals by means of computation and computing the frequency offset on the base of the two separated signals

Abstract: Methods and systems for fast synchronization and data reception for frequency hopping wireless communication systems are disclosed. Aspects of one method may include receiving a plurality of RF signals corresponding to a plurality of hopping frequencies. The RF signals may be processed in parallel to determine a hopping sequence. For example, the plurality of RF signals may be down-converted to a corresponding plurality of IF or baseband signals. The down-converted signals may be combined together to a single combined signal, and the single combined signal may then be processed to determine the frequency hopping sequence.

Abstract: FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.

Abstract: Wireless microphone signals are detected by processing an input signal to determine a number of frequency bins within a channel frequency band having an energy level above a first predefined threshold (S510); identifying locations of the frequency bins having an energy level above the first predefined threshold, when the number of bins is greater than zero (S520, S530); for each frequency bin having an energy level above the first predefined threshold, processing signals within a narrow frequency band of the frequency bin (S570); determining a number of signal peaks within the narrow frequency band that are above a second predefined threshold (S575); and generating a message indicating a presence or an absence of a microphone signal based on the number of signal peaks (S590, S595).

Abstract: An information providing system is provided. An in-vehicle apparatus is provided in a vehicle. The in-vehicle apparatus receives a broadcasting. An information providing apparatus transmits area information related to a broadcast channel that is receivable in a traveling area of the vehicle to the in-vehicle apparatus. A storage unit stores the area information for each traveling area. A receiving unit receives probe information including a predetermined reference position or a position of the vehicle from the in-vehicle apparatus. A deciding unit decides a reference area set including a plurality of traveling areas which are within a predetermined distance from the reference position included in the received probe information for each vehicle. An accumulating unit accumulates the received probe information. A determining unit determines a traveling record of the vehicle in each traveling area on the basis of the accumulated probe information.

Abstract: A method for scanning a channel in a broadcast receiver is provided. In the method, a broadcast area corresponding to a current position is derived from a database (DB). When a valid channel list for the derived broadcast area exists in the DB is determined, broadcasting using the information of the valid channel list. However, when the valid channel list for the derived broadcast area does not exist, a search for a channel for the derived broadcast area is initiated.

Abstract: A method for wireless communication in a Long-Term Evolution (LTE) or LTE-equivalent environment which allows a mobile device to manage autonomous search functions (ASF) is disclosed. In an LTE-equivalent environment, a mobile device may function in several modes, including idle and connected. In either mode, the mobile device may need to use an autonomous search function (ASF) to find or exchange information with base stations. The mobile device first determines the mode the current operation pertains to. When modifying the availability of an ASF, the mobile device distinguishes between the modes that will execute the ASF. When calling an ASF, the mobile device determines the availability of that function based on the device's current mode. In idle mode, the mobile device uses the idle mode ASF. Conversely, in connected mode the mobile device uses the connected mode ASF. The two functions are distinctly managed and operated by the mobile device.

Abstract: A device (100) and method for frequency scanning uses two radios. The device (100) includes a processor (515), a scan radio (130) including a receiver (135) coupled to the processor (515), and a data radio (105) including a transmitter (115) that is also coupled to the processor (515). The processor (515) determines a transmission schedule for the transmitter (115) of the data radio (105) in response to a capability to receive a frequency scanning signal at the receiver (135) of the scan radio (130).

Abstract: A method and apparatus for reducing the number of cells that must be broadcast and the number of cells that a mobile terminal must measure when different frequencies and technologies must be listed as neighboring cells.

Abstract: A network search method of a user equipment (UE) for a wireless communication system that improves network search speed for acquiring Public Land Mobile Network (PLMN) available list available where the user equipment is located. A network search method measures powers of all the frequency bands supported by a UE in response to a network search request, generates a scan list as a result of measurement of the powers, searches networks listed in the scan list for available channels; acquires neighbor cell information from a system information message of one of the available channels. In addition, the method skips the networks indicated by the neighbor cell information in search of networks by removing the networks from the scan list.

Abstract: A broadcast system and a channel setting method therein are provided. The broadcast system includes a channel searching unit for setting a center frequency for at least one broadcasting channel, and a searching frequency of n-th and (n+1)-th channels according to each center frequency, and storing channel information obtained from broadcast information received through the n-th or (n+1)-th channel when a broadcast signal is detected at the searching frequency.

Abstract: Techniques to search for signals while in an out-of-service state are described. In an aspect, a network entity may collect information for wireless devices within a designated area, determine at least one search parameter (e.g., a scan rate) based on the collected information, and provide the search parameter(s) to wireless devices within the designated area. The wireless devices may perform searches for signals in accordance with the search parameter(s) when they are out of service. In another aspect, a wireless device may collect information related to out-of-service events encountered by the wireless device, send the collected information to the network entity, receive the search parameter(s) from the network entity, and perform searches in accordance with the search parameter(s) when out of service. In yet another aspect, the wireless device may determine the search parameter(s) based on the collected information.

Abstract: Scanning neighboring base stations in a wireless access system is provided. In one embodiment, a method of scanning neighboring base stations for assessing channel quality includes receiving from a serving base station information associated with at least one neighboring base station, and transmitting a scanning request message from a mobile subscriber station to the serving base station, wherein the scanning request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration being associated with a requested number of iterations of the scanning of the at least one neighboring base station. The method also includes receiving a scanning response message from the serving base station, wherein the scanning response message comprises an allowed scan duration and an allowed scan iteration, the allowed scan iteration being associated with an allowed number of iterations of the scanning of the at least one neighboring base station.

Abstract: A channel detecting method executes a process for instructing a broadcast wave scan start, a process for performing tuning control, a process for starting initialization/operation of an OFDM demodulation section and starting the counting of a synchronous establishment timer unit, a process for determining that broadcasting is being conducted, a process for determining the expiration of the synchronous establishment timer unit, a process for outputting a TS signal and notifying that a broadcast parameter is being detected, a process for instructing transition to the next channel, a process for making a decision as to a final channel, a process for performing a transition operation, and a process for terminating a broadcast wave scan. When no broadcast is being conducted, a demodulation unit, an error correction unit and a decoder are not operated.

Abstract: A system, method and computer readable medium comprised of in-vehicle passive monitoring and information management system elements which together detect, identify, report and discourage unsafe wireless device use by the operator of a vehicle. An in-vehicle monitoring device determines the vehicle's operational state and location, identifies wireless device transmitter emissions within the vehicle and communicates to a remote information management system using a wireless network, or after-the-fact, using a local network to a locally-installed software version of the information management system. The information management system collects information retrieved from in-vehicle devices and correlates this information with other database information to provide users with timely alerts, tracking, and records of unsafe wireless device use.

Abstract: In one embodiment, the present invention includes a method for receiving an incoming radio frequency (RF) signal in a receiver, estimating a signal-to-noise ratio (SNR) of a constant modulus (CM) signal in the incoming RF signal based on a calculated magnitude of the incoming RF signal, and indicating presence of a modulated signal in the incoming RF signal if the estimated SNR is greater than a threshold.

Abstract: A mobile terminal including a wireless communication unit configured to scan for available frequency bands, and a controller configured to assign a frequency band identification information to each available frequency band and to assign channel identification information to each channel included in a corresponding available frequency band.

Abstract: Systems and methods for removing phase shifts due to hierarchical modulation to improve synchronization and performance in legacy and hierarchical decoders are presented. To compensate for the effects of hierarchical modulation, such methods include receiving an I,Q symbol that has been further modulated by an overlay phase shift, detecting the direction of the overlay phase shift, de-rotating the symbol by a defined angle corresponding to the overlay phase shift and said direction; and passing the symbol to legacy synchronization and forward error correction decoding stages after said de-rotating. An exemplary receiver can be provided to implement the disclosed methods.

Abstract: In an embodiment, a mobile radio communication device is provided. The mobile radio communication device may include a receiver configured to receive radio pilot information via a predefined physical radio channel according to a radio communication technology family, wherein the radio pilot information includes availability information about the availability of at least one radio communication technology of at least one other radio communication technology family. The mobile radio communication device may further include a radio communication protocol controller configured to provide at least one radio communication protocol of the at least one radio communication technology of the at least one other radio communication technology family based on the received pilot information.

Abstract: Provided are a broadcasting signal receiving apparatus and a channel scanning method which are capable of scanning any desirable plurality of channels quickly by providing the channel scan function using information on a plurality of multiplexer (MUX) numbers, wherein the broadcasting signal receiving apparatus, includes a tuner unit; a memory which stores information related to a plurality of MUX numbers intended to be scanned; and a control unit which performs a channel scan by providing the information related to the MUX numbers stored in the memory to the tuner unit consecutively in accordance with an input of a prescribed scan instruction.

Abstract: A system and method for reducing communication latency including monitoring a communication channel for a plurality of indicators wherein a first indicator represents a desired communication operation; basing a communication operation upon a second indicator that indicates that the communication operation has an optimistic probability of success; and initiating an operation optimistically when at least the second indicator confirms that the operation optimistically initiated was a correct operation based upon the second indicator confirming the desired communication operation represented by the first indicator.

Abstract: A mobile station includes a radio channel condition measurement portion that measures a radio channel condition, a radio channel averaging portion that averages the measured radio channel condition over a predetermined period of time, and a reception mode control portion that allows switching to a measurement mode for measuring a different frequency and a different system to be realized in accordance with the averaged radio channel condition; and a base station includes a radio channel condition averaging portion that averages a radio channel condition received from a mobile station, over a predetermined period of time, and a transmission mode control portion that allows switching to a discontinuous transmission mode for performing a discontinuous transmission to be realized in accordance with the averaged radio channel condition.

Abstract: A receiver can extract digital data from wireless radio frequency signal. The digital data contains at least two sets of compressed digital audio data each associated with a different set of audio program. One set of compressed digital audio data is delivered in a first frequency band and the other set in a second frequency band. One of the sets is stored in a memory system and the remaining set is not stored in the memory system. A user can select one of the sets of compressed digital audio data for decompression and then conversion to analog audio signal.

Abstract: A demodulation system for Radio Data System (RDS) signals in a receiver includes a quadrature mixer (303) configured to convert a RDS signal at an input frequency directly to a base band RDS signal, a single filter (305) configured to filter the base band RDS signal to provide a RDS signal, and a signal level detector (311) configured to provide an indication of a level of the RDS signal (313), a demodulator (315) configured to demodulate the RDS signal and provide RDS data, the RDS data corresponding to information for user consumption, where the indication is used for selectively interrupting the user consumption when the level of the RDS signal is unsatisfactory.

Abstract: For each broadcast control channel of a plurality of broadcast control channels associated with a plurality of wireless networks, a mobile device decodes control information on the broadcast control channel and stores this control information in its memory. The control information includes a network identification which uniquely identifies a particular wireless communication network. Such decoding is performed in between or during repeated acts of measuring signal strength levels of an RF signal on the broadcast control channel, and prior to completion of an averaging function for calculating an averaged signal strength level of the signal strength levels on the broadcast control channel. Decoding may be performed only for those broadcast control channels identified to have the most optimal signal strengths.

Abstract: A method of configuring a tuner includes scanning at least one range of radio frequencies, measuring a signal quality metric for each of a plurality of the frequencies, and selecting a set of operational frequencies for the tuner. The selecting step is dependent upon the measuring step.

Abstract: A base station performs communication of an orthogonal frequency division multiplexing (OFDM) scheme with a mobile station by using any one of equal to or greater than two frequency bands. The base station includes means that transmits a synchronization channel and a control channel using a band that includes a center frequency fA on a raster of a first band (20 MHz) and that has a bandwidth equal to or greater than that of a second band (5 MHz of the end). The control channel includes center frequency information for specifying a center frequency fA? of the second band. Since the mobile station moves to a desired band after obtaining center frequency information using a band including the center frequency on a raster, the mobile station can connect to the desired band without searching frequencies that are not on the raster.

Abstract: Various embodiments for providing multi-band operation in a mobile computing device are described. In one or more embodiments, a mobile computing device may be arranged to support quad-band GSM communication in the GSM-850, GSM-900, GSM-1800, and GSM-1900 frequency bands. The mobile computing device may be arranged to determine a starting frequency band based on the home country and home network. By using the determined starting frequency band associated with the home country and home network of the user, fewer and/or shorter delays may be experienced when searching for and acquiring an available frequency. Once a network search is completed, the mobile computing device may be arranged to determine whether a network can be found in current frequency band pair for normal service, to disconnect from the acquired network if normal service is not supported, and to intelligently search for an available frequency in a different frequency band. Other embodiments are described and claimed.

Abstract: The present invention provides architectures and methods which use multiple radio receive chains in mobile devices to provide enhanced performance, such as when acquiring and maintaining network access. A plurality of receive chains simultaneously perform signal level measurements across one or more measurement cycles. The number of RF channels upon which measurements are performed may be determined adaptively/dynamically. One or more criterion may be used to set signal level thresholds. If a measured signal for a given channel fails to satisfy a threshold, then that RF channel may be removed from the network acquisition process. If a measured signal for a channel exceeds another threshold, then that channel may be employed in further network acquisition processes, such as identifying potential beacon signal channels, verifying beacon signal channels and synchronizing the device to one of the beacon channels.

Abstract: A method for automatically tuning a frequency modulator in a mobile device is described. A frequency band is automatically scanned using a frequency modulation (FM) receiver. The FM receiver is integrated as a part of the mobile device. Quality associated with channels of the frequency band is analyzed to identify at least one available channel at a first frequency. The first frequency is assigned to an FM modulator. The FM modulator is integrated as a part of the mobile device. A determination is made whether a command to scan for a second frequency is received. If the command to scan for the second frequency is not received, a signal on the first frequency is transmitted by the FM modulator.

Abstract: Scanning neighboring base stations in a wireless access system is provided. In one embodiment, a method of scanning neighboring base stations for assessing channel quality includes receiving from a serving base station information associated with at least one neighboring base station, and transmitting a scanning request message from a mobile subscriber station to the serving base station, wherein the scanning request message comprises a requested scan duration and a requested scan iteration, the requested scan iteration being associated with a requested number of iterations of the scanning of the at least one neighboring base station. The method also includes receiving a scanning response message from the serving base station, wherein the scanning response message comprises an allowed scan duration and an allowed scan iteration, the allowed scan iteration being associated with an allowed number of iterations of the scanning of the at least one neighboring base station.

Abstract: A receiver contains a demodulator system that can extract digital data from wireless radio frequency signal. The digital data contains three sets of compressed digital audio data. Two sets of compressed digital audio data are delivered in a first frequency band and the other set in a second frequency band. The set in the second frequency band and one of the sets in the first frequency band are stored in a memory system and the remaining set is not stored in the memory system. A user can select one of these three sets of compressed digital audio data for decompression and then converted to analog audio signal.

Abstract: The present invention discloses a method of multiple systems sensing for coexisting radio networks, including: performing energy detection and carrier locking; detecting the fundamental frequencies; and identifying the corresponding active systems from the detected fundamental frequencies and the evaluation of the estimated power spectrum density vector or the estimated trispectrum matrix. Based on the method, an apparatus capable of multiple systems sensing is presented. Furthermore, the present invention also provides an apparatus of multiple systems sensing for coexisting radio networks.

Abstract: A method of accommodating aberrant behavior in wireless devices in a wireless network includes the steps of establishing communication with at least one wireless device, monitoring signals received from the at least one wireless device, determining characteristics of the at least one wireless device based on the monitored signals, comparing the determined characteristics with prescribed characteristics for wireless devices exhibiting aberrant behavior and altering settings to accommodate the at least one wireless device, when the determined characteristics match the prescribed characteristics.

Abstract: A wireless connection apparatus which scans radio frequency bands for local quiet unused, vacant, or unassigned frequencies which the apparatus can use, on a temporary basis, to establish a link for communicating between a portable multimedia device and a nearby RBDS/RDS configured receiver or source. The apparatus does not interfere with or utilize frequencies actively in use by an assigned user.

Abstract: Systems and methods for detecting unoccupied channels for a multi-channel cognitive radio system are described. To detect unoccupied channels, truncated sequential detection processes are employed that can use a dynamically extended truncation time that is based on early completion of detection processes applied to preceding channels.

Abstract: The method according to the invention for adjusting the tuning of a receiver circuit for receiving modulated a high frequency signal within a frequency range, the high frequency signal comprising a sync signal, uses the steps of shifting a frequency of a local oscillator within the frequency range and looking for the sync signal, and storing the value of a first frequency, when a sync signal is recognized. Then, the frequency of the local oscillator is continuously shifted in the same frequency direction across the bandwidth of the modulated high frequency signal by controlling the presence of the sync signal. The frequency, at which the sync signal is lost, is stored as a second frequency. From the first and the second frequency in a further step an optimum tuning frequency, located between the first and second frequency, is calculated for the reception for the high frequency signal.

Abstract: A method for receiving a station signal is provided. First, a radio frequency signal is received and converted to a first IF signal. Next, the first IF signal is demodulated to a baseband signal and a demodulation signal is obtained, the demodulation signal being a result of differentiating a phase of the baseband signal. Then a determination as to whether a DC level of the demodulation signal has an S-curve characteristic at a specific frequency is made according to the demodulation signal. If so, the specific frequency is determined as a first station frequency, a first station signal is obtained from the radio frequency signal according to the first station frequency.

Abstract: A node forms a network by scanning for an existing network. If an existing network is not found, the node operates as a network controller node of the first network and admits at least one client node to the first network. As a network controller node, the node designates one of the client nodes as a scout node. The scout node removes itself from the first network and scans for a second network. If the scout node does not return to the first network after a predetermined time, it is assumed that the scout node has found a second network. The network controller node of the first network then designates the remaining client nodes as scout nodes, and then joins the second network as a client node. Therefore, multiple networks are avoided.

Abstract: A radio system includes: a memory which stores a system parameter and a pseudo parameter, the system parameter being used for generation of a feature value specific to a search target radio system, the pseudo parameter being similar to the system parameter; a feature value generator which generates one or a plurality of the feature values based on a signal in a received frequency band by using the system parameter; a non-feature value generator which generates one or a plurality of non-feature values based on the signal in the received frequency band by using the pseudo parameter; and a determination section which determines whether or not a signal of the search target radio system exists by using the one or the plurality of the feature values and the one or the plurality of non-feature values.

Abstract: A system and methods (300, 400) are disclosed for conserving energy in a multimode communication device (106). A system that incorporates teachings of the present disclosure may include, for example, a communication device having a multimode wireless transceiver (202) for accessing a plurality of wireless access technologies (103), and a controller (214) for managing operations of the multimode wireless transceiver. The controller is programmed to enable (300) scanning for a select one of the wireless access technologies when the communication device is near a known location of a wireless access point. An embodiment for a network management system (100) is also disclosed.

Abstract: A cognitive radio system includes: a state detecting device that scans a frequency band allocated to another radio system than the cognitive radio system to detect a first use-state of the frequency band; a first server including a first gathering unit that receives first information relating to the first use-state and a second gathering unit; a second server that stores a second use-state of the frequency band allocated to the other radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and a notifying unit that notifies a terminal device in the cognitive radio system of information of an available channel based on the first information and the second information.

Abstract: A method for tuning a system to a plurality of service signals. The method uses a first and a second tuning process. The first tuning process is adapted and performed to search and find carrier signals of potential service signals and to determine frequencies of potential services corresponding to the service signals. The second tuning processing is adapted and used to register to the system the services corresponding to the service signals based on the determined frequencies.

Abstract: A portable device that scan s a subset of frequencies, such as the FM band, and displays to user the best carrier frequency for transmissions based on the received signal strengths. This device will find the carrier frequency that can provide the least amount of signal interference due to other transmitters in the area, and display the results to the user and/or reconfigures the receiver to tune to the best carrier frequency detected.

Abstract: An apparatus and method for searching for an improved radio broadcast in a portable terminal are provided. The apparatus includes a radio function performance unit. If an input for a radio broadcast channel search is detected while listening to a radio broadcast, the radio function performance unit changes from an original previously listened radio broadcast to a radio broadcast corresponding to the detected input. If the input for the radio broadcast channel search is released, the radio broadcast channel is restored to the original previously listened radio broadcast channel.

Abstract: An RF radio and a method of monitoring warning alert data is provided. The RF radio includes a radio receiver for receiving broadcast radio wave signals, and a tuner adjustable for selecting radio wave signal channels within AM and FM radio bands and radio wave signal channels within a weather band. The weather band is adapted to provide warning alert data. The radio also includes a controller for controlling the tuner to select a radio wave signal channel within the AM or FM radio band. The controller controls the tuner to periodically switch to the weather band to simultaneously monitor a plurality of weather band channels during an alternate frequency update, and determines presence of warning alert data. The controller further initiates receipt of the warning alert data when such warning alert data is determined to be present.

Abstract: Wireless communication is carried out between devices. A highest frequency band is selected. When the selected frequency band includes an unused channel in which no disturbing wave is present, a maximum transmission rate at which a received field strength value exceeds a threshold value is determined. When the selected frequency band does not include an unused channel or one in which no disturbing wave is present or there is no transmission rate associated with the selected frequency band at which the received field strength value exceeds the threshold value, the next highest frequency band is successively selected and the above is repeated. When the maximum transmission rate is successfully determined, communication is initiated using the unused channel of the selected frequency band at the maximum transmission rate as a communication channel.