48results about How to "Reduce retransmission delay" patented technology

The invention discloses a high-performance load balancing system based on a software defined network. The high-performance load balancing system mainly solves the problems of uneven load and link congestion in a network core layer of an existing data center. The system comprises a Fat-Tree underlying network and an SDN controller, and Fat-Tree bottom layer network is provided with a flow samplingdetection module, a DCTCP flow control module and a coding transmission module based on FEC, and the functions of sensing flow in real time, distinguishing mouse flow image flow, adjusting the flow rate of a port according to link time delay and adding a redundant packet to reduce mouse flow time delay are completed respectively. The SDN controller is additionally provided with a topology information module and an image flow scheduling module which are used for storing topology information of an underlying network and scheduling an image flow to a path with the minimum path cost. According tothe invention, retransmission delay caused by packet loss is reduced, the problem of blocking of the head and the tail of a mouse stream is solved, the image stream throughput is improved, and the method can be used for Fat-Tree data center network topology.

The invention provides a method for reducing an hybrid automatic repeat request (HARQ) retransmission time interval in a multi-carrier system, which comprises the following steps that: a base station carries out aggregation on a plurality of carriers, wherein the allocation of at least one carrier is different from that of other carriers so as to increase the distribution of uplink resources on atime domain in a system; and the base station sends data on the aggregated carriers. By increasing the number of the subframes of the uplink resources in the system, the method reduces the HARQ maximum processes and round-trip time (RTT) in the system while guaranteeing to meet the requirements of the ratio of total uplink subframes and total downlink subframes of the system. The method sufficiently utilizes the multi-carrier property of the system and reduces the HARQ retransmission delay in the system so as to improve the transmission efficiency of the system.

A method for detecting local NACK in a wireless communications system comprises an HARQ transmitter generating a local NACK signal when the HARQ transmitter gives up HARQ transmission due to expiration of a timer (302).

The invention belongs to the technical field of digital information transmission, and discloses an adaptive cross-carrier hybrid automatic repeat request processing method and system. The method comprises the steps that high-frequency-band data transmission is carried out, and the data is aggregated through a special A-MPDU; new transmission and retransmission information transmission is carried out; a receiver receives the data and carries out BA feedback, a the sender selects a retransmission scheme and carries out retransmission indication according to the BA feedback information; and the receiver receives redundant information of the retransmitted error data according to the instruction, judges a corresponding relationship between the retransmitted information and the error informationreceived last time, combines the retransmitted redundant information with the data received last time, and performs combined decoding. According to the invention, an adaptive cross-carrier retransmission HARQ scheme is adopted, the retransmission information adaptively selects high-frequency-band same-frequency transmission or cross-carrier low-frequency transmission according to the direction ofthe data currently transmitted in the high frequency band, retransmission does not need to wait for the completion of new transmission, and the retransmission time delay is reduced.

The invention relates to retransmissions in wireless communication systems. It is proposed to reduce the retransmission delays by utilizing feedback associated with a lower protocol layer than the conventional feedback messages of the ARQ functionality. After sending a packet from a transmitter towards a receiver, the transmitter monitors the link for a low-level control signal from the receiver. The low-level control information can e.g. comprise power control commands or be related to link quality indicators. Based on this signal, it is decided whether a retransmission is to take place, e.g. at the transmitter or at an external control unit.

The embodiment of the present invention describes a method, device, chip, and terminal for sending messages. The method is used for a terminal, and the terminal includes a baseband processor, an application processor, and a communication interface. The method includes sending the baseband processor to The application processor reports the information of the first message, and the first message is a message to be sent discarded by the baseband processor; the application processor transmits the second message to the baseband processor according to the information of the first message. A message, the second message is the same as the first message; the baseband processor sends the second message to the network device through the communication interface. In this way, the time delay for the terminal to retransmit the message can be reduced to a certain extent, so that the data communication between the terminal and the network is smoother.

The present invention discloses a HARQ transmission method comprising: a sending end receives the confirmation message to the independent HARQ PDU; when the confirmation result in confirmation message is ACK, the sending end sends the confirmation result to the receiving end. The present invention also discloses a HARQ transmission device. The HARQ transmission method and device thereof has the advantages of solving the problems that the transmission reliability of the independent HARQ PDU can not be guaranteed in HARQ PDU transmission. Furthermore, with regard to longer spacing interval for transmission between HARQ PDU, the HARQ transmission method and device thereof can also timely detect NACK / ACK errors and reduce retransmission delay of HARQ PDU.

The invention discloses a high-performance load balancing system based on a software-defined network, which mainly solves the problems of uneven load and link congestion in the core layer of the existing data center network. It includes a Fat-Tree underlying network and an SDN controller. The Fat-Tree underlying network is deployed with a traffic sampling detection module, a DCTCP flow control module, and an FEC-based encoding transmission module, which respectively complete real-time perception of traffic and distinguish between mouse and elephant flows. The link delay adjusts the port flow rate and adds redundant packets to reduce the mouse flow delay. The SDN controller is additionally equipped with a topology information module and an image flow scheduling module, which are used to complete storage of the topology information of the underlying network and schedule the image flow to a path with the minimum path cost. The invention reduces the retransmission delay caused by packet loss, solves the problem of head-to-tail blockage of rat flow, improves throughput of elephant flow, and can be used in Fat-Tree data center network topology.

The invention discloses a method, a system and a device for transmitting data, which belong to the field of communication. The method comprises the following steps: loading data pockets transmitted by a radio network controller RNC to at least two carrier frequencies for transmitting and respectively carrying out backup save on the data pockets loaded on the carrier frequencies in a preset bufferby a base station; obtaining the transmitting status of the data pockets; and deleting the data pockets which are transmitted correctly and backup saved in the buffer according to the transmitting status, and loading the backup data pockets which are transmitted incorrectly and backup saved in the buffer to another carrier frequency for transmitting. The system comprises the radio network controller RNC and the base station. The preset buffer is arranged on the base station NodeB to carry out buffer and backup on the received data pockets, and the data pockets are directly acquired from the buffer of the base station when the data pockets need retransmitting so as to decrease the flow impact to the RNC and the NodeB caused by an Iub interface and avoid unnecessary retransmission of an RLClayer.

The invention discloses a method and device for triggering and constructing an ARQ status report for an automatic retransmission request, wherein the method includes: after completing downlink or uplink scheduling, the sender of the ARQ status report judges whether there is remaining air interface bandwidth, and when it is determined that there is and is greater than the first When a predetermined bandwidth value is reached, trigger the construction of an ARQ status report; judge whether the remaining air interface bandwidth meets the sending requirements of the ARQ status report, if satisfied, then send the ARQ status report, otherwise cancel sending the ARQ status report; Based on this, the timeliness of the ARQ status report is further improved, and the retransmission delay of the ARQ is reduced.

The present application discloses a data transmission method and an electronic device. The method is applied to the application receiving end configured in the first device. The method includes: receiving the datagram in the message set corresponding to the current message transmission cycle through the first transmission channel text; at least according to the transmission delay parameter on the first transmission channel and the start time of the message transmission period, the receiving boundary time corresponding to the message transmission period on the first transmission channel is obtained; the message transmission period is configured in the second device The sending end of the application sends the data message through the first transmission channel; when the current moment reaches the receiving boundary time, obtain the target data message in the message set that has not been received by the application receiving end; obtain the target data message corresponding to A response message: at least transmit the response message to the application sender, so that the application sender resends the target data message corresponding to the response message to the application receiver through the first transmission channel and the second transmission channel at the same time.