Abstract: A radio receiver tunes a radio channel by generating a periodic signal, mixing the periodic signal with received radio signals and passing the mixed signal through a channel filter that has a passband that corresponds to the bandwidth of the tuned channel. The receiver receives allocation information identifying a set of subcarriers in the tuned channel on which to receive an OFDM data signal. It uses this information to receive the OFDM data, modulated on the allocated subcarriers. When the allocated subcarriers span an allocated frequency range that is less than the width of the tuned channel and that is offset from the centre of the tuned channel in an offset direction, the receiver offsets the channel filter from the centre of the tuned channel in the offset direction such that the channel filter passes i) said OFDM data signal, ii) an in-allocation reference signal, and iii) an out-of-channel reference signal.

Abstract: A radio receiver of a radio communication system is configured to tune to a radio channel by generating a periodic signal, mixing the periodic signal with radio signals received from a radio transmission system and passing the mixed signal through a channel filter. The radio receiver receives, from the radio transmission system, an OFDM data signal modulated on a set of OFDM subcarriers within the tuned channel. The channel filter has a passband that is wider than the channel bandwidth of the tuned channel such that the filter passes i) said OFDM data signal, ii) an in-channel reference signal, and iii) an out-of-channel reference signal. The radio receiver comprises channel estimation logic configured to use both reference signals to calculate a channel estimate for an OFDM subcarrier within the tuned channel.

Abstract: A method of operating a radio receiver arranged to receive a plurality of data symbols transmitted on one of a predetermined set of frequencies. The method comprises receiving a first set of data symbols at a first transmission frequency. The first set of data symbols comprises a message indicating a first frequency sub-set. A synthesiser is calibrated for the one or more frequencies in the first frequency sub-set. A second set of data symbols transmitted on at least one of said one or more frequencies from the first sub-set is received. It is determined from the second set of data symbols whether a network quality metric exceeds a threshold. The synthesiser is calibrated for one or more frequencies in a second frequency sub-set when the network quality metric exceeds the threshold. The second sub-set comprises frequencies that are not in the first sub-set.

Abstract: A radio transceiver comprises one or more hardware resources, e.g. a processor; memory; a peripheral device; an algorithmic hardware accelerator; and/or a radio frequency component. A cellular communication radio is operable in an active mode in which it has access to the one or more hardware resources for transmitting and/or receiving cellular communication signals, and an inactive mode in which it does not. A global navigation satellite systems radio, arranged to use the one or more hardware resources to receive positioning signals, has access to the one or more hardware resources only when the cellular communication radio is operated in the inactive mode.

Abstract: A radio receiver of a radio communication system is configured to tune to a radio channel by generating a periodic signal, mixing the periodic signal with radio signals received from a radio transmission system and passing the mixed signal through a channel filter. The radio receiver receives, from the radio transmission system, an OFDM data signal modulated on a set of OFDM subcarriers within the tuned channel. The channel filter has a passband that is wider than the channel bandwidth of the tuned channel such that the filter passes i) said OFDM data signal, ii) an in-channel reference signal, and iii) an out-of-channel reference signal. The radio receiver comprises channel estimation logic configured to use both reference signals to calculate a channel estimate for an OFDM subcarrier within the tuned channel.

Abstract: A radio receiver tunes a radio channel by generating a periodic signal, mixing the periodic signal with received radio signals and passing the mixed signal through a channel filter that has a passband that corresponds to the bandwidth of the tuned channel. The receiver receives allocation information identifying a set of subcarriers in the tuned channel on which to receive an OFDM data signal. It uses this information to receive the OFDM data, modulated on the allocated subcarriers. When the allocated subcarriers span an allocated frequency range that is less than the width of the tuned channel and that is offset from the centre of the tuned channel in an offset direction, the receiver offsets the channel filter from the centre of the tuned channel in the offset direction such that the channel filter passes i) said OFDM data signal, ii) an in-allocation reference signal, and iii) an out-of-channel reference signal.

Abstract: A method of operating a radio receiver arranged to receive a plurality of data symbols transmitted on one of a predetermined set of frequencies. The method comprises receiving a first set of data symbols at a first transmission frequency. The first set of data symbols comprises a message indicating a first frequency sub-set. A synthesiser is calibrated for the one or more frequencies in the first frequency sub-set. A second set of data symbols transmitted on at least one of said one or more frequencies from the first sub-set is received. It is determined from the second set of data symbols whether a network quality metric exceeds a threshold. The synthesiser is calibrated for one or more frequencies in a second frequency sub-set when the network quality metric exceeds the threshold. The second sub-set comprises frequencies that are not in the first sub-set.

Abstract: A radio transceiver comprises one or more hardware resources, e.g. a processor; memory; a peripheral device; an algorithmic hardware accelerator; and/or a radio frequency component. A cellular communication radio is operable in an active mode in which it has access to the one or more hardware resources for transmitting and/or receiving cellular communication signals, and an inactive mode in which it does not. A global navigation satellite systems radio, arranged to use the one or more hardware resources to receive positioning signals, has access to the one or more hardware resources only when the cellular communication radio is operated in the inactive mode.

Abstract: In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.

Abstract: In an example embodiment a method comprises receiving at least one data stream from at least two transmitter antennas, wherein the at least one data stream is pre-coded by a set of weighting coefficients; receiving a pilot channel from each of the at least two transmitter antennas; processing the received at least one data stream by an equalizer with a set of equalizer filter coefficients; calculating for each of the at least one data stream following: a signal power and an interference power from other stream, if there is any intererence, at least in part based on a set of post equalizer channel coefficients and the set of weighting coefficients; a noise power at least in part based on the received pilot channels and the set of weighting coefficients; and a signal to interference and noise ratio based on the corresponding calculated signal power, interference power and noise power.

Abstract: A method and system for soft handover area detection for uplink interference avoidance that includes a network device and mobile device in a communications network. A trigger criteria threshold is determined for the mobile device. The mobile device is using a downlink carrier. If a trigger criteria has risen above or fallen below the trigger criteria threshold, inter-frequency measurements of co-sited cells are performed and compared to determine if a soft handover area exists. Co-sited cells are searched for downlink carriers and reselection is initiated from the downlink carrier to a co-sited cell downlink carrier if the co-sited cell downlink carrier is useable by the mobile device. Reselection is initiated from the downlink carrier to a non co-sited cell downlink carrier if no co-sited cell downlink carrier useable by the mobile device is found. The system provides for reselection while uplink carrier interference is avoided.

Abstract: The invention relates to a calibration method and a calibration arrangement for an active filter intended to be used especially in portable radio apparatus. The filter (100) according to the invention is an active RC filter and it is integrated except for one or more of its capacitances or one or more of its resistances. Advantageously the highest capacitance or the highest resistance is left unintegrated. When using an external capacitance, the principle of the calibration is as follows: The integrated resistances are corrected using a common coefficient such that the external capacitance together with the integrated resistances produces the correct time constants (1). Then the integrated capacitances are corrected using a common coefficient such that they together with the internal resistances that were corrected in the previous phase produce the correct time constants (2). If the filter comprises multiple circuit stages, the two-phase calibration process described above is repeated for each circuit stage.

Abstract: The present invention provides a method and a device in which two or more fingers of a RAKE receiver can locked to a multipath received signal in a situation of a fat finger impulse response. One embodiment of the present invention assigns two RAKE fingers to an impulse response so that one finger tracks the impulse response with an Early-Ontime DLL method and the other finger is tracking the impulse response with an Ontime-Late DLL method. The method comprises detecting the delay between the received signal and a delayed version, comparing the delay with a pre-determined threshold and when the delay falls below the threshold, changing the tracking method of the delayed version of the received signal to a second tracking method.

Abstract: An apparatus and corresponding method for responding to a repeat request in a wireless communication system in which packets are communicated according to a modulation and coding scheme, with one or more packets provided in a frame communicated during a transmission time interval, the method including the steps of: if a repeat request is received, then ordering in a second order the bits of the packets associated with the repeat request, and repeating the steps up to and including retransmitting the packets associated with the repeat request; wherein in the second order, the symbols constituting the modulation are generated differently than in the original transmission.

Abstract: A method and system for uplink interference avoidance that includes a network device and mobile device in a communications network. A signal characteristic of a downlink channel currently not used by the mobile device is measured to determine if the signal characteristic has increased or decreased. The signal characteristic increase or decrease is reported to the network device. The signal characteristic may be, for example, signal quality or signal strength. The interference may be, for example, adjacent channel leakage power ratio (ACLR) interference. A handover from the downlink channel currently used by the mobile device is launched thus avoiding interference in an uplink channel not currently used by the mobile device. An inter-frequency handover or an inter-system handover may be launched.

Abstract: A system in which a packet-sending entity and a packet-receiving entity communicate using a plurality of parameter signaling channels (SCCH) and also using a plurality of shared data channels (SDCH) and do so according to a protocol in which when packet data are transmitted over one or more transmission time intervals (TTIs), the communication being such that once a parameter signaling channel is assigned to the packet-receiving entity for communicating a packet, the assigned channel is used in each subsequent TTT as long as there is at least a portion of the packet in the subsequent TTI. When there is, the packet-receiving entity despreads and decodes only one parameter signaling channel for the subsequent TTI along with the data channels. When there is not, the packet-receiving entity despreads all the parameter signaling channels for the subsequent TTI, and may decode some or all of the parameter signaling channels.

Abstract: A method and system for soft handover area detection for uplink interference avoidance that includes a network device and mobile device in a communications network. A trigger criteria threshold is determined for the mobile device. The mobile device is using a downlink carrier. If a trigger criteria has risen above or fallen below the trigger criteria threshold, inter-frequency measurements of co-sited cells are performed and compared to determine if a soft handover area exists. Co-sited cells are searched for downlink carriers and reselection is initiated from the downlink carrier to a co-sited cell downlink carrier if the co-sited cell downlink carrier is useable by the mobile device. Reselection is initiated from the downlink carrier to a non co-sited cell downlink carrier if no co-sited cell downlink carrier useable by the mobile device is found. The system provides for reselection while uplink carrier interference is avoided.

Abstract: An apparatus and corresponding method for responding to a repeat request in a wireless communication system in which packets are communicated according to a modulation and coding scheme, with one or more packets provided in a frame communicated during a transmission time interval, the method including the steps of: if a repeat request is received, then ordering in a second order the bits of the packets associated with the repeat request, and repeating the steps up to and including retransmitting the packets associated with the repeat request; wherein in the second order, the symbols constituting the modulation are generated differently than in the original transmission.

Abstract: A system in which a packet-sending entity and a packet-receiving entity communicate using a plurality of parameter signaling channels (SCCH) and also using a plurality of shared data channels (SDCH) and do so according to a protocol in which when packet data is to be transmitted, the communication occurs over one or more transmission time intervals (TTIs). The methods are such that once a parameter signaling channel is assigned to the packet-receiving entity for communicating a packet, the assigned channel is used in each subsequent TTI as long as there is at least a portion of the packet in the subsequent TTI. When there is, the packet-receiving entity despreads and decodes only one parameter signaling channel for the subsequent TTI along with the data channels. When there is not, the packet-receiving entity despreads all the parameter signaling channels for the subsequent TTI, and decodes either all, one, or none of the parameter signaling channels.

Abstract: The present invention provides a method and a device in which two or more fingers of a RAKE receiver can locked to a multipath received signal in a situation of fat finger impulse response. One embodiment of the present invention assigns two RAKE fingers to an impulse response so that one finger is tracking the impulse response with Early-Ontime DLL method and the other finger is tracking the impulse response with Ontime-Late DLL method. The method comprises detecting the delay between the received signal and its delayed version, comparing the delay with a pre-determined threshold and in the case when the delay falls below the threshold, changing the tracking method of the delayed version of the received signal to a second tracking method.