2553 results about "Retransmission" patented technology

Transmitters, receivers, and coding schemes to increase data rate and decrease bit error rate of an optical data link are disclosed. Data is transmitted across the link with a less than nominal bit error rate (BER), by encoding the data using a forward error correction (FEC) code or by requesting retransmission of transmitted packets in error. Data is transmitted at a speed that introduces errors at a rate that is in excess of the nominal BER but that may be corrected using the FEC code or retransmission so that the data may be received with less than the nominal BER. The data rate is increased as the link operating speed is increased beyond the overhead required by the FEC codes or retransmission. High speed FEC encoders and decoders facilitating such transmission are disclosed.

The present invention relates to a method and system of transmissions and retransmissions of packet data in a communications system, where the communications system uses switched channels, switching between rates or channels of different characteristics, and connection control and management in such a system. Particularly, the invention relates to radio resource management in a Universal Mobile Telecommunications System, UMTS, or WCDMA system allowing for use of compatible protocols for non-switched and switched channels.

In a method for the transmission of data packets (D) from a transmitter (TR) to a receiver (RE) identification of transmitted data packets are stored. Defective data packets (D) are detected by the receiver (RE), status messages (S) which request defective data packets for retransmission are sent from the receiver (RE) to the transmitter (TR) and retransmissions of requested data packets are performed according to the status messages (S). The transmitter (TR) evaluates a first status message (S11) with an identification of at least one first requested data packet and retransmits the first data packet. The transmitter (TR) then initializes a timing unit according to the retransmission of the first data packet, wherein the timing unit or a threshold for the timing unit is attributable to the first data packet. When the transmitter evaluates a further status message (S12) and detects at least one further data packet that is requested for a retransmission, it selects the further data packet if the timing unit has reached the threshold or if the identification of the further data packet is different from the identification of the first data packets. Only the selected data packets are retransmitted. A transmitter and software programs embodying the invention are also described.

A method and apparatus for wireless communication may provide a multi-link PDCP sublayer (710) in a radio network controller (702) capable of allocating PDCP PDUs among a plurality of RLC entities (712) for use in a multi -point HSDPA network. Some aspects of the disclosure address issues relating to out-of-order delivery of the PDCP PDUs to a UE (610), such as unnecessary retransmissions. That is, the disclosed multi-link PDCP (710) may be capable of distinguishing between sequence number gaps that are caused by physical layer transmission failures and those caused merely by skew.

A method and device for determining a parameter (RTO) associated with a retransmission time-out feature in a data unit transmitter implementing a protocol (TCP) that provides an acknowledgment feature and a retransmission time-out feature, where according to one aspect decreasing values of the round trip time (RTT) are treated differently with respect to their influence on a mean deviation parameter (RTTVAR) than increasing values of the round trip time, where according to another aspect weight values (g, h, w) used in the determination of the parameter (RTO) are chosen such that at least one of them is time variable, and where according to a further aspect the parameter (RTO) is also calculated on the basis of a value (SR) indicative of the number of spurious time-outs in the communication.

The present disclosure includes systems and methods for direct packet communications and store and forward packet communications including packets which have attributes which determine the lifetime of the packet contents and these lifetimes are optionally a function of the recipient. Example methods are given featuring the transmission of packets with limited lifetime, the storing and retransmission of packets to one or more recipients and confirmation of deletion of packet contents. It is also shown that cryptography may be employed to ensure that timed presentation of packet contents to recipients takes place and is authenticated by the sender.

The invention relates to a method for retransmitting a transmission unit (12) via an air interface in a wireless access system employing fragmentation for transmissions, wherein the available transmission capacity on said air interface is variable, and wherein said transmission unit (12) was transmitted a first time together with fragmentation information. In order to enable such a retransmission, it is proposed that the transmission unit (12) is retransmitted after a refragmentation with information FC, FSN on this refragmentation and with at least some of the fragmentation information FC′, FSN′, TSN that was transmitted before with said transmission unit (12) in the first transmission. The invention equally relates to a corresponding wireless access system and to a corresponding transmitting unit for such a wireless access system.

A wireless local area network includes transmission of data packets between endpoints in which packet frames are divided into sub-frames. On reception of a frame, the integrity of each individual sub-frame is checked. Sub-frames that pass the integrity check are acknowledged and retransmission is requested only for sub-frames that failed the integrity check. Consequently, only the affected sub-frames require retransmission instead of the whole frame.

An OFDM communication apparatus comprises subcarrier selecting means for selecting subcarriers to be transmitted for each branch in accordance with the number of retransmissions of transmitting signals and transmitting means for providing TIFFT processing to transmitting signals arranged in said subcarriers for each branch to transmit the resultant.

Gang migration refers to the simultaneous live migration of multiple Virtual Machines (VMs) from one set of physical machines to another in response to events such as load spikes and imminent failures. Gang migration generates a large volume of network traffic and can overload the core network links and switches in a datacenter. In this paper, we present an approach to reduce the network overhead of gang migration using global deduplication (GMGD). GMGD identifies and eliminates the retransmission of duplicate memory pages among VMs running on multiple physical machines in the cluster. The design, implementation and evaluation of a GMGD prototype is described using QEMU/KVM VMs. Evaluations on a 30-node Gigabit Ethernet cluster having 10 GigE core links shows that GMGD can reduce the network traffic on core links by up to 65% and the total migration time of VMs by up to 42% when compared to the default migration technique in QEMU/KVM. Furthermore, GMGD has a smaller adverse performance impact on network-bound applications.

The invention discloses an embedded system capable of upgrading software on line and an online upgrading method. The system comprises an embedded terminal, and a remote master station, a short range master station and a local master station which can respectively transmit data with the embedded terminal, wherein the embedded terminal comprises a master control chip, a program memory, a data memory, a remote communication interface and a local/close communication interface; the program memory of the embedded terminal is divided into a region A and a region B which have equal structures, when the master station transmits a software package to the embedded terminal, a bootstrap process of a system of the embedded terminal is sequentially performed from the region A to the region B in turn, and a bootstrap region is converted when the software of the system is upgraded each time; and double backups of system program are saved in the program memory, and if the upgrading process is failed, the system program can be recovered from a region in which the system program is successfully started last time. By the method, various abnormal situations in the online upgrading process can be effectively identified, and corresponding measures are taken for repair, such as error retransmission, resume from break point, invalid abandon or failure recovery, so that the correctness and robustness of online upgrading can be ensured.

The invention relates to a method for providing control signalling associated to a protocol data unit conveying user data in a mobile communication system and to the control channel signal itself. Furthermore, the invention also provides a mobile station and a base station and their respective operation in view of the newly defined control channel signals defined herein. In order to reduce the control channel overhead, the invention suggests defining a common field for the transport format and redundancy version in the control channel information format. According to one approach, the common field is used to jointly encode transport format and redundancy version therein. According to another aspect, one shared field is provided on the control channel signal that indicates either a transport format or a redundancy version depending of whether the control channel signal relates to an initial transmission or a retransmission. In another embodiment, further enhancements to a HARQ protocol are suggested for addressing certain error cases.

A transmission/reception method and apparatus for a mobile communication system supporting uplink MIMO is provided. In the transmission method, a User Equipment (UE) transmits two transport blocks according to a predetermined number of layers and respective precoding indices, an evolve Node B (eNB) transmits, when one of the transport blocks is lost, a negative acknowledgement for the lost transport block, and the UE sets a precoding index for the lost transport block to a predetermined value to retransmit the lost transport block while maintaining the number of layers.

The invention relates to a message retransmission method and a system based on a multi-core architecture. The method comprises the following steps: acquiring a data packet in the Internet; when the data packet is a tunnel link data packet, decapsulating the data packet to obtain an IP data packet; and carrying out Hash operation on the quintuple of the IP data packet, computing according to the obtained Hash value and Hash table size thereof and the number of CPUs in the multi-core CPU to obtain the corresponding CPU, labeling the Hash value into the IP data packet, and transmitting the labeled IP data packet to the CPU. The invention increases the utilization rate of fixed network equipment in the wireless Internet, realizes lock-free design of shared resources, and is applicable to the wireless Internet.

The invention relates to a HARQ method using incremental redundancy and providing synchronous retransmissions. Further, the invention relates to a receiving entity and a transmitting entity employing the HARQ method and to a mobile communication system. To optimize conventional HARQ retransmission protocols, the invention introduces a ternary feedback which allows requesting a self-decodable version of a data packet under certain conditions. Further, the ternary feedback is provided in a backward compatible manner using a combination of conventional HARQ feedback signaling and scheduling related control signaling.

The invention discloses a fault-tolerant on-chip network system with the global communication service management capability. In the fault-tolerant on-chip network system, a network monitor and fault-tolerant routers serve as cores and are connected mutually through special buses to form the fault-tolerant on-chip network system. The invention further discloses a route distribution method and a network data transmission method applied to the fault-tolerant on-chip network system. Through the fault-tolerant on-chip network system, the route distribution method and the network data transmission method, the global network state can be monitored, network congestion and fault links can be located and recognized, data retransmission can be conducted timely, transient faults can be avoided, congestion and permanent fault links can be avoided through rerouting, the fault-tolerant capability of an on-chip network is effectively improved, and meanwhile the network data transmission performance at a high communication load is optimized and improved.