87results about How to "Reduce Feedback Latency" patented technology

The performance of closed loop transmit diversity (CLTD) systems may be improved, in accordance with aspects of the present invention, by encoding antenna control information fed back from a mobile station to a base station. As compared to prior art CLTD systems that send antenna control bits in unencoded feedback messages, encoding the antenna control information may result in reduced feedback delays and reduced transmission power. Further, in accordance with some aspects of the present invention, the antenna control bits may be fed back to the base station on a common feedback channel also used to feed back channel quality indication, thus reducing processing overhead.

The invention discloses an information sending method which comprises the following steps: mapping W of ACK/NACK as M bits when W of the ACK/NACK and H of channel state information CSI bits need to be simultaneously transmitted on a same subframe, wherein, W, H and M are positive integers; encoding the M of ACK/NACK bits and the H of the CSI bits after mapping; and mapping the ACK/NACK bits and the CSI bits after encoding onto a PUCCH for sending. The invention further correspondingly discloses an information sending system. The adoption of the method and the system can simultaneously transmit the ACK/NACK and the CSI, lead the number of ACK/NACK feedback bits to be greater than two bits, further ensure the maximum throughput of the system and reduce the down channel information feedback time delay.

The invention provides a method and a device for transmitting and acquiring uplink HARQ feedback information, wherein the method comprises the steps of acquiring a service priority sequence list of downlink subframes; according to the service priority sequence list, multiplexing the HARQ feedback information of the downlink subframes according to a sequence that the service priorities reduce from highest to lowest, and obtaining to-be-transmitted HARQ feedback information; successively assigning uplink subframes to the to-be-transmitted HARQ feedback information, and transmitting the to-be-transmitted HARQ feedback information to a base station. According to the method for transmitting the uplink HARQ feedback information, user equipment can preferably transmit the HARQ feedback information of the subframes with low time delay requirement. When the base station acquires a transmission error of time-delay-sensitive service data, the downlink subframes which carry the time-delay-sensitive service data can be preferably retransmitted, thereby shortening transmission time of the time-delay-sensitive service data.

The invention discloses a wireless communication method which comprises the following steps of: transmitting one or more communication frames between network equipment and terminal equipment, wherein each communication frame comprises a downlink subframe and an uplink subframe, and a guard interval is formed between the downlink subframe and the uplink subframe; and dynamically configuring structures of the downlink subframe and the uplink subframe in each frame in a process of transmitting the one or more communication frames, wherein a dynamically configured downlink subframe at least comprises a leading sequence, a system information channel, a control channel and a downlink transmission channel, and a dynamically configured uplink subframe at least comprises an uplink transmission channel. The invention also discloses a wireless communication system. The frame structure is dynamically configured, so that uplink and downlink wireless transmission resources can be dynamically allocated based on service requirements, and future data service requirements with rich kinds and different characteristics can be well dynamically met.

The invention discloses an ACK/NACK feedback method and related devices and is used for solving the problem that time positions capable of carrying out ACK/NACK feedback at the earliest are different and the normal feedback of ACK/NACK of downlink transmission cannot be ensured due to the fact that the transmission and processing time delay required by data with different sending time interval lengths is different. The method comprises the steps that a terminal receives a first physical downlink control channel, wherein a first indication domain is carried in downlink control information of the first physical downlink control channel, and the first indication domain is used for determining a time domain position of ACK/NACK feedback information; and the terminal determines the time domain position of the ACK/NACK feedback information of the first physical downlink control channel or a first physical downlink shared channel corresponding to the first physical downlink control channel according to the first indication domain and transmits the ACK/NACK feedback information at the time domain position of the ACK/NACK feedback information.

The invention discloses a method and a system thereof for realizing uplink power control in a feedback enhancement system of time division duplex, which applies a bidirectional spectrum and comprises the following processes: a base station alternatively distributes uplink time slots in a wireless frame of the bidirectional spectrum to different terminals or different terminal groups; each terminal or each terminal group obtains the uplink time slots with the same interval; the base station chooses a unidirectional spectrum of a downlink to transfer a feedback signal of power control to the terminals; a wireless frame on the unidirectional spectrum and that on the bidirectional spectrum keep synchronous; the terminals transfer uplink signals within the distributed uplink time slots to the base station; the base station finishes parameter estimation within a specific delay and transfers a feedback signal of power control to the terminals by adopting the unidirectional spectrum; the terminals receive the feedback signal of power control on the unidirectional spectrum and regulate power control of terminals, thus preparing for transferring the uplink signals within downlink-uplink time slots distributed for the terminals within the same wireless frame. The invention realizes sending down the feedback signal of power control with high frequency of which the period is shorter than the length of the frame; besides, the feedback delay is small, and the system throughput is increased.

The invention discloses a wireless communication system, a network device and a terminal device. The network device is used for dynamically configuring the structure and the length of a current communication frame and transmitting frame structure configuration information in the current communication frame, and the terminal device is used for acquiring the structure and the length of the current communication frame according to the frame structure configuration information of the current communication frame. By dynamically configuring the frame structure, different service features and requirements of future rich and varied data services are considered, the flexible variable frame structure simultaneously meeting link adaptation and service requirements is designed for adaptive dynamic resource allocation, and the requirements of devices with different processing capacities can be met. By dynamically configuring the frame length, and control overhead, scheduling overhead and implementation complexity can be reduced.

The invention belongs to the field of intelligent navigation devices and discloses a simultaneous localization and mapping and inertial navigation combined error fusion system. The system comprises a carrier, an inertial navigation device, a simultaneous localization and mapping device and an error fusion device. The inertial navigation device comprises an accelerometer, a gyroscope and an inertial navigation driving device. The simultaneous localization and mapping device comprises laser radar and an environment map building device. The error fusion device comprises a linear discrete simultaneous localization and mapping error module, an inertial navigation error module and a weight fusion module. Therefore, high accuracy and reliability in positioning and navigation of robots can be realized.

The embodiment of the invention provides an uplink resource scheduling method and device, wherein the method comprises the steps of: when a confirmation signal fed back by a terminal for downlink datais received, starting a scheduling timer; and, in the timing range of the scheduling timer, periodically performing uplink resource pre-scheduling according to the pre-set interval time. According tothe embodiment of the invention, application of uplink resources can be carried out without SR resources; feedback information of the terminal can be scheduled accurately and effectively; therefore,the downlink data feedback delay is reduced; the TCP handshaking delay is reduced; and the user perception is improved.

The invention provides a hybrid automatic repeat request transmission method, a terminal and a base station. The transmission method provided by the invention comprises the following steps: determining a PUCCH resource set configured for a terminal, wherein the PUCCH resource set only comprises PUCCH resources using a PUCCH format 0 and a PUCCH format 1; determining a target PUCCH resource used bythe HARQ feedback information corresponding to the DCI in a PUCCH resource set according to the PRI contained in the DCI, and sending the HARQ feedback information on the target PUCCH resource; wherein the PRIs contained in the DCIs corresponding to the HARQ feedback information transmitted on the same PUCCH resource in the same time slot are the same, and the PRIs contained in the DCIs corresponding to the HARQ feedback information transmitted on different PUCCHs in the same time slot are different.

The present invention provides a PUCCH sending method, a PUCCH receiving method, a terminal and a base station. The PUCCH sending method comprises the steps: receiving at least two downlink transmissions, HARQ-ACKs of the at least two downlink transmissions being transmitted in the same time unit; determining PUCCH resources for transmitting HARQ-ACKs of the at least two downlink transmissions according to the PUCCH resources indicated by the PRI in the downlink control information DCI used by the PDCCHs corresponding to the at least two downlink transmissions respectively; and sending the corresponding HARQ-ACK of the downlink transmission on the determined PUCCH resource, so that the rapid HARQ-ACK feedback can be realized, and the HARQ-ACK feedback time delay is reduced.

The invention provides a method and apparatus for transmitting and acquiring uplink HARQ feedback information. The method includes the following steps: acquiring a business priority list; based on the business priority list, binding the HARQ feedback information of a downlink sub-frame from highest priority to lowest priority, generating to-be-transmitted HARQ feedback information; and successively designating an uplink sub-frame to the to-be-transmitted HARQ feedback information, and transmitting the to-be-transmitted HARQ feedback information to a base station. The method of transmitting uplink HARQ feedback information enables a user device to prioritize the transmission of HARQ feedback information of sub-frames having low time-delay requirements to the base station, and when the base station is informed of errors in the transmission of delay-sensitive business, enables the prioritization of re-transmission of downlink sub-frames which carry delay-sensitive business data, thus shortening the delivery of the delay-sensitive business data.

The invention provides an underwater acoustic OFDMA resource allocation method based on feedback channel state information. The method comprises the following steps that a sending end main node sendsa channel state test signal to a plurality of receiving end nodes; a receiving terminal node performs carrier grouping joint polynomial data fitting preprocessing on the channel state information estimated value according to the received test signal, and feeds back to the transmitting terminal main node according to a time division multiplexing mode of access time optimization; the sending end main node analyzes the feedback channel state information and calculates to obtain a time-frequency correlation coefficient and a statistical mean value of the carrier; the joint distribution of carrierwaves, bits and power of the OFDMA is carried out; and the distribution result and the data signal are simultaneously received by the plurality of sub-nodes of the receiving end, and de-multiplexing of the OFDMA data signal is performed according to the distribution result to obtain respective corresponding data. The bit error rate of the system can be reduced, and the throughput is improved.