Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for a quick retransmission of signals in a communication system.SOLUTION: A transmitting terminal, transmits transmission signals in a form of packets to a receiving terminal, if the packet was intended for the receiving terminal, and the receiving terminal demodulates the packet. The receiving terminal then computes a quality metric of the packet, and compares the computed quality metric with a quality metric contained in the packet. If the quality metrics match, the packet is forwarded for further processing. If the quality metrics fail to match, the receiving terminal sends a request for retransmission of the packet. The transmitting terminal determines which packet needs to be retransmitted based on the request for retransmission. If delivery of the packet in accordance with the aforementioned description fails, retransmission in accordance with conventional sequence-number-based schemes, e.g., radio link protocol, is attempted.
Abstract:
PROBLEM TO BE SOLVED: To provide a telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component. SOLUTION: A receiver system includes a first circuit for receiving a composite signal and extracting a pilot signal and a data signal from the received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for improving the throughput during transmission of data packets within a plurality of time slots in a high data rate communication system.SOLUTION: A method for receiving a first packet from a source network node includes: generating a data rate control signal based on signal quality of a received signal transmitted by the source network node; sending the data rate control signal to the source network node; receiving a first signal having a data rate based on the data rate control signal from the source network node; measuring signal quality of the first signal to form a first signal quality metric; and sending a first feedback signal based on the first signal quality metric.
Abstract:
PROBLEM TO BE SOLVED: To provide a high data rate communication system capable of variable rate transmission, which adjusts an open loop rate control with a closed loop rate control to maximize throughput. SOLUTION: An access point generates interleaved multi-slot packets that allow an access terminal to transmit indicator messages to the access point in accordance with recently received data carried within slots of the multi-slot packets. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus of forward direction output control in communication system. SOLUTION: In a data communication system capable of performing variable rate transmission, a data rate is decided by performing the maximum C/I observation of a forward direction link signal so as to be observed in an access terminal 6. Data transmission is planned based on the access terminal 6 which have begun the forward direction output control. The forward direction output control decreases quantization loss of a forward direction link rate caused by excess transmission output. The access terminal 6 reports excess C/I estimation relating to a selected rate to an access point 4. Then the access point 4 decreases its self transmission output by a proper amount when operating the access terminal 6. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To adjust an open loop rate control with a closed loop rate control to minimize transmission delay and to maximize throughput in a high data rate communication system capable of variable rate transmission. SOLUTION: An access point generates interleaved multi-slot packets that allow an access terminal to transmit indicator messages to the access point in accordance with recently received data carried within slots of the multi-slot packets. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for providing an accurate estimate of received signal interference for wireless communications systems.SOLUTION: A system for providing an accurate interference value signal received over a channel and transmitted by an external transceiver includes a first receiver section for receiving the signal, which has a desired signal component and an interference component. A signal extracting circuit extracts an estimate of the desired signal component from the received signal. A noise estimation circuit 12 provides the accurate interference value on the basis of the estimate of the desired signal component and the received signal. A look-up table transforms the accurate noise and/or interference value to a normalization factor. A carrier signal-to interference ratio circuit employs the normalization factor and the received signal to compute an accurate carrier signal-to-interference ratio estimate. Path-weighting/combining circuitry 42 generates optimal path-combining weights on the basis of the received signal and the normalization factor.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for quick retransmission of signals in a communication system.SOLUTION: A transmitting terminal transmits signals in a form of packets to a receiving terminal, if the packet is intended for the receiving terminal, if so, the receiving terminal demodulates the packet. The receiving terminal then computes a quality metric of the packet, and compares the computed quality metric with a quality metric contained in the packet. If the quality metrics match, the packet is forwarded for further processing. If the quality metrics fail to match, the receiving terminal sends a request for retransmission of the packet. The transmitting terminal determines which packet needs to be retransmitted based on the request for retransmission. If delivery of the packet in accordance with the description fails, retransmission in accordance with a conventional sequence-number-based scheme, e.g., radio link protocol, is attempted.
Abstract:
PROBLEM TO BE SOLVED: To provide an accurate estimate of interference of a received signal for a wireless communication system. SOLUTION: A system includes a first receiver section for receiving a signal, which has a desired signal component and an interference component. A signal extracting circuit extracts an estimate of the desired signal component from the received signal. A noise estimation circuit 12 provides an accurate interference value based on the estimate of the desired signal component and the received signal. A look-up table transforms the accurate noise and/or interference value to a normalization factor. A carrier signal-to-interference ratio circuit employs the normalization factor and the received signal to compute an accurate carrier signal-to-interference ratio estimate. Path-combining circuitry generates optimal path-combining weights based on the received signal and the normalization factor. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
Un aparato configurado para retransmitir señales en un sistema de comunicación, que comprende: medios (522) para descodificar contenidos de una unidad de señal recibida, en el que dichos contenidos de dicha unidad de señal recibida se descodifican de acuerdo con la información transportada en un canal de control; medios (524) para generar una primera señal de retroalimentación; medios (532) para generar una segunda señal de retroalimentación; medios (521) para determinar una métrica de calidad de dicha unidad de señal recibida; medios (521) para indicar a dichos medios para generar una primera señal de retroalimentación para que generen dicha primera señal de retroalimentación de acuerdo con dicha métrica de calidad, en el que la primera señal de retroalimentación no contiene una indicación explícita respecto a qué unidad de señal recibida se va a retransmitir, medios (526) para indicar a dichos medios para generar una segunda señal de retroalimentación para que generen dicha segunda señal de retroalimentación de acuerdo con un número de secuencia de dicha unidad de señal recibida cuando una retransmisión de dicha unidad de señal recibida de acuerdo con dicha métrica de calidad se declara fallida; medios (520) para detectar un preámbulo de dicha unidad de señal recibida; y medios para evitar la descodificación de dicha unidad de señal recibida si dicho preámbulo indica que dicha unidad de señal recibida no se debe descodificar.