Abstract: The invention is directed to efficient transfer of low bit rate services in a communication system. A synchronization symbol which has known characteristics may be included as a first symbol of digital broadcast frames. The synchronization symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. Low bit rate services are allocated to time slots following the pilot symbol used for synchronization allowing for fast access times with maximum power saving capabilities. A user terminal wakes up just before the synchronization symbol and received the data allocated for the low bit rate services. The user terminal may power off for the remaining time slots which are allocated for higher bit services to conserve power.

Abstract: Aspects of the invention are directed to service and channel discovery in a digital broadcast network. A pilot synchronization symbol, which has known characteristics, is included as a first symbol of digital broadcast frames. The pilot symbol, which can be decoded without having to resort to trial and error methods, contains parameters for the rest of the signal. So, the rest of the signal can be decoded without trial and error methods after the pilot symbol (and any additional synchronization symbols) is decoded. Channels containing digital video broadcast services can be efficiently detected using the known part of the signal. If the fixed known part is not found from the examined signal, then the signal will be considered a non-digital-video-broadcast signal or an empty channel, and the receiver can promptly proceed to a next channel/frequency. In this way, detecting non-digital-video-broadcast and empty channels becomes relatively fast.

Abstract: In accordance with at least one embodiment, fixed TDM slot/frame structure and statistical multiplexing are combined. A TDM slot, which is fixed (in size and position) is reserved for a variable bit rate service such that the bit rate of the TDM slot/channel is below the average rate of the service. Such a reserved TDM slot may be referred to as a service specific slot. Since the service specific slot is reserved with a bit rate below the average rate of the service, additional capacity is reserved from a rate matching slot, which may be common for multiple services. In this rate matching slot, the capacity may be shared between services according to any suitable strategy for allotting services to portions of the rate matching slot, including, but not limited to, a statistical multiplexing algorithm.

Abstract: Aspects of the invention are directed to using forward error correaction in a digital broadcast network that supports generic stream encapsulation. According to an embodiment, error correaction data is calculated over application data, and the application data and error correaction data are encapsulated in generic stream encapsulation packets. In another embodiment, error correaction data is calculated over generic stream encapsulation packets. In yet another embodiment, error correaction data is calculated over, and encapsulated within, generic stream encapsulation packets. In still another embodiment, error correaction data is calculated over application data packets.

Abstract: Aspects of the invention are directed to service discovery in a digital broadcast network. A service discovery descriptor, which may be electronic service guide-provider and cell specific, provides mapping between a service identifier, a logical channel identifier, and a physical channel, which may be characterized by a frame identifier and a slot identifier, that is, each physical channel may have one or more slots within one or more frames. A neighboring service discovery descriptor provides mapping for the service available within neighboring cells. Aspects of the invention are directed to an encapsulation protocol that encapsulates variable length data, including, but not limited to, the service discovery descriptor and the neighboring service discovery descriptor, into fixed length data stream packets.

Abstract: The invention relates to a method for correcting an IQ-imbalance (In-phase and Quadrature) of an IQ-based direct conversion receiver (200). In the method a group of radio frequency pilot signals are received in the direct conversion receiver (200). They are conveyed to an in-phase branch and a quadrature-phase branch of the receiver (200) and mixed, in the analogue domain, to form a baseband in-phase (I) and quadrature-phase (Q) signal components. The signal componets are conveyed to a digital demodulator (210) which detects the IQ-phase imbalance of the direct conversion receiver (200) by analysing at least one of the baseband in-phase (I) and the quadrature-phase (Q) signal components. In the method, the detected IQ-imbalance is corrected, in the analogue domain of the direct conversion receiver (200), to achieve a 90 degrees phase difference between a future baseband in-phase (I) signal component and a future baseband quadrature-phase (Q) signal component.

Abstract: Provided are apparatuses and methods for efficient and timely broadcasting of emergency information over any system by at least one transport protocol supported within each system, e.g., in DVB-H it is carried as an IP stream or as filecast, and within other DVB systems, can be supported as audio, video, or data and even as IP. Systems and methods are provided by which urgent emergency information or other information that needs immediate action(s) can be signaled to an end user.

Abstract: The invention relates to a method for correcting an IQ-imbalance (In-phase and Quadrature) of an IQ-based direct conversion receiver (200). In the method a group of radio frequency pilot signals are received in the direct conversion receiver (200). They are conveyed to an in-phase branch and a quadrature-phase branch of the receiver (200) and mixed, in the analogue domain, to form a baseband in-phase (I) and quadrature-phase (Q) signal components. The signal componets are conveyed to a digital demodulator (210) which detects the IQ-phase imbalance of the direct conversion receiver (200) by analysing at least one of the baseband in-phase (I) and the quadrature-phase (Q) signal components. In the method, the detected IQ-imbalance is corrected, in the analogue domain of the direct conversion receiver (200), to achieve a 90 degrees phase difference between a future baseband in-phase (I) signal component and a future baseband quadrature-phase (Q) signal component.

Abstract: Provided are apparatuses and methods for detecting neighboring cells in a communication network based on Transmission Parameter Signaling (TPS) bits received in a signaling frame. In one example, a signaling frame contains a field of TPS bits that indicate a type of the signaling frame. The type of the signaling frame may indicate the information carried in the signaling frame as information of a current cell or a neighboring cell. The signaling frame may further include information from a neighboring cell in the same network or a different network as the current cell. The signaling frame may further be arranged in a superframe in which the a plurality of frames are transmitted to a receiver in a certain sequence. Each frame in a superframe or a sequence of frames may include a parameter for defining the location of the frame.

Abstract: The invention relates to a method for adjusting IQ-imbalance of a direct conversion receiver (200). In the method a radio frequency training signal is locally generating and conveyed to an in-phase branch and a quadrature-phase branch of the receiver (200). The method comprises mixing, in the analogue domain, the radio frequency training signal of the in-phase branch with a first mixing signal to form a baseband in-phase component (I) of the training signal and mixing, in the analogue domain, the radio frequency training signal of the quadrature-phase branch with a second mixing signal to form a phase shifted component (Q) of the training signal. The baseband in-phase component (I) and phase shifted component (Q) are analogue-to-digital converted to form a digital baseband in-phase component and a digital baseband phase shifted component of the training signal.

Abstract: The invention relates to a method for reducing effects of self-created digital radio frequency interference on broadband reception. In the method a DVB-T (Digital Video Broadcasting—Terrestrial) signal is received at a broadband receiver (200). The received signal is demodulated in a demodulation process. Information (210) on frequencies of self-created digital radio frequency interference is provided for the broadband reception. The information has been generated based on prior measurements and stored to a memory prior to the receiving of the DVB-T signal. The information is used in the broadband reception so as to reduce the effects of the self-created digital radio frequency interference on the broadband reception.

Abstract: A method is disclosed that is performed in an apparatus having a receiver including a number of modules. The method includes receiving information in a reception frequency band. Responsive to a notification from a transmitter of a transmission in a predetermined transmission frequency band, at least one countermeasure is performed by at least one of modules. The at least one countermeasure is predetermined to reduce an effect of interference caused by transmission on reception of the information in the reception frequency band. Exemplary countermeasures include freezing an automatic gain control loop, freezing a synchronization loop, discarding channel estimation data, and blanking received information. Certain criteria, such as transmission power and transmission mode may also be used to determine whether and how many countermeasures are to be used.

Abstract: A method, a system, a transmitter and a receiver for identification of a time sliced elementary streams using PSI/SI tables. This identification provides a way to separate time-sliced elementary stream from non-time-sliced elementary streams by defining two descriptors in PSI/SI tables. A time slice identifier descriptor is defined, which can be used to identify elementary streams which are time sliced. This descriptor is also used to provide additional information about the transmitted elementary streams. The invention provides a way to announce additional information of the time sliced elementary streams via PSI/SI tables. Additionally, it provides a mechanism to categorize single elementary stream(s) as non-time sliced and time sliced. A way to identify time sliced elementary streams carried over DVB networks is disclosed and providing additional information on those streams. This can be done by using the time slice identifier descriptor.

Abstract: A terrestrial digital video broadcasting (DVB-T) network is used to transmit IP datagrams to receiving devices using multiprotocol encapsulation (MPE). MPE datagram section and, if forward error correction (FEC) is used, MPE-FEC datagram sections may include time-slicing parameters, such as a “delta-t” parameter for specifying a time until the next burst is transmitted and a flag for indicating the end of a burst. Thus, MPE and MPE-FEC datagram sections can be transmitted in bursts. Other types of sections, however, do not include such time-slicing parameters and thus cannot usually be transmitted in bursts. Nevertheless, by assembling a burst including at least one MPE or MPE-FEC datagram section which specifies delta-t and MPE or MPE-FEC datagram section at the end of a burst which indicates its position, other types of sections can benefit from being transmitted in bursts.

Abstract: Systems and methods applicable, for instance, in wireless communications. For example, a wireless node and/or other computer may act to create a candidate signal list and/or may act to measure strength for one or more candidate list signals. As another example, the wireless node and/or other computer may act to calculate average difference between the strength of the strongest signal of the candidate list and the strength of a currently-received signal. As yet another example, the wireless node and/or other computer may act to perform one or more operations to employ the strongest signal of the candidate list in place of the currently-received signal.

Abstract: A method, a system, a transmitter and a receiver for identification of a time sliced elementary streams using PSI/SI tables. This identification provides a way to separate time-sliced elementary stream from non-time-sliced elementary streams by defining two descriptors in PSI/SI tables. A time slice identifier descriptor is defined, which can be used to identify elementary streams which are time sliced. This descriptor is also used to provide additional information about the transmitted elementary streams. The invention provides a way to announce additional information of the time sliced elementary streams via PSI/SI tables. Additionally, it provides a mechanism to categorize single elementary stream(s) as non-time sliced and time sliced. A way to identify time sliced elementary streams carried over DVB networks is disclosed and providing additional information on those streams. This can be done by using the time slice identifier descriptor.

Abstract: A broadband digital transmission network is described in which a form of time-division multiplex is utilized to maximize the bandwidth usage and error tolerance in the transmission channel. In addition, clients within the network may implement a power conserving operation mode which is particularly beneficial for mobile terminals.

Abstract: A system that allows mobile terminals to periodically remove power from at least some components is disclosed. The mobile terminal receives bursts of content. Some of the bursts of content include relative time information identifying the transmission time of a subsequent burst of content. The mobile terminal may remove power from a receiving module during times when the mobile terminal is not scheduled to receive content bursts.

Abstract: A system that allows mobile terminals to periodically remove power from at least some components is disclosed. The mobile terminal receives bursts of content. Some of the bursts of content include relative time information identifying the transmission time of a subsequent burst of content. The mobile terminal may remove power from a receiving module during times when the mobile terminal is not scheduled to receive content bursts.

Abstract: The invention relates to a method for reducing effects of self-created digital radio frequency interference on broadband reception. In the method a DVB-T (Digital Video Broadcasting—Terrestrial) signal is received at a broadband receiver (200). The received signal is demodulated in a demodulation process. Information (210) on frequencies of self-created digital radio frequency interference is provided for the broadband reception. The information has been generated based on prior measurements and stored to a memory prior to the receiving of the DVB-T signal. The information is used in the broadband reception so as to reduce the effects of the self-created digital radio frequency interference on the broadband reception.