75 results about "Round-robin scheduling" patented technology

A system includes a plurality of computers interconnected by a network including one or more switching nodes. The computers transfer messages over virtual circuits established thereamong. A computer, as a source computer for one or more virtual circuit(s), schedules transmission of messages on a round-robin basis as among the virtual circuits for which it is source computer. Each switching node which forms part of a path for respective virtual circuits also forwards messages for virtual circuits in a round-robin manner, and, a computer, as a destination computer for one or more virtual circuit(s), schedules processing of received messages in a round-robin manner. Round-robin transmission, forwarding and processing at the destination provides a degree of fairness in message transmission as among the virtual circuits established over the network. In addition, messages are transmitted in one or more cells, with the round-robin transmission being on a cell basis, so as to reduce delays which may occur for short messages if a long messages were transmitted in full for one virtual circuit before beginning transmission of a short message for another virtual circuit. For each virtual circuit, the destination computer and each switching node along the path for the virtual circuit can generate a virtual circuit flow control message for transmission to the source computer to temporarily limit transmission over the virtual circuit if the amount of resources being taken up by messages for the virtual circuit exceeds predetermined thresholds, further providing fairness as among the virtual circuits. In addition, each switching node or computer can generate link flow control messages for transmission to neighboring devices in the network to temporarily limit transmission thereto if the amount of resources taken up by all virtual circuits exceeds predetermined thresholds, so as to reduce the likelihood of message loss.

A SYN packet bandwidth Distributed Denial-of-Service (DDoS) attack is defended against by intercepting and identifying SYN packets in a “DDoS gateway” advantageously positioned at the edge of the network to be protected (e.g., one hop upstream from the protected link), and by queuing these intercepted SYN packets in a separate queue from other TCP packet queues. Edge per-flow queuing is employed to provide isolation among individual TCP connections sharing the link. A fair scheduling algorithm such as round robin scheduling is used to ensure that SYN packets (such as those generated as part of a SYN bandwidth attack) cannot overwhelm the egress link in the presence of other TCP packets.

The invention discloses a packet scheduling method and a device. The method comprises: A. a received packet is cached into corresponding VOQ according to service levels and destination contained in a packet head; B. according to the number of the packet in each VOQ and network congestion level, authorization is generated for each VOQ and is sent to each VOQ; C. packet scheduling dequeuing is carried out by each VOQ according to the authorization; D. round-robin scheduling is performed according to the priority level of dequeuing scheduling, and then, packet scheduling is output. The invention simultaneously discloses a device for realizing packet scheduling, and the method and the device can realize packet scheduling to VOQ, are flexible to schedule and save hardware logics resources.

In between network devices interconnected by plural optical channels, logical paths are defined according to upper traffic and also priority of the traffic. The network device includes: a frame forming section for reading user packets out of a buffer section composed of plural buffers defined for the respective paths on transfer schedule, and forming path frames having a specified frame length and individual ordinal numbers with respect to each path; a switch for selecting output channels to equally distribute the path frames by round robin scheduling; and data transmitting part for transmitting data on the logical paths. Thus, it is made possible to realize a frame transfer system capable of performing data transmission, which satisfies QOS (Quality Of Service) required for user traffic, on the WDM networks connected by plural OCHs.

A wireless hierarchical heterogonous pico-net providing communication between smart-phone based analysis and control application and multiplicity of sensors and actuators embedded in the ski equipment is described. The topology of this pico-net comprises two layers of hierarch, where the first layer is configured as a Bluetooth wireless network using a Round-Robin scheduling method and consisting of a single master and up-to seven slaves, and the second layer of the hierarchy is configured as a sub-nets consisting of multiplicity of sensors and actuators and communicating internally using ANT personal area network (PAN) wireless interface, or via a digital wire interface. Such network topology provides deterministic latency of a hierarchy a single-hop Bluetooth network, irrespective of the numbers of sensors and actuators embedded within each sub-net of the second layer of hierarchy. The network latency is upper-bounded by the number of slaves in the first layer of hierarch, Furthermore, the Round-Robin scheduling method is supplemented with the gating-off the slave RF transmission when the slave has no data to send, or when the difference between current sensor samples and the previous sensor sample is smaller then predefined threshold. Such discontinued transmission lowers slave power consumption system interference.

One embodiment of the present invention sets forth a technique for dynamically scheduling and managing compute tasks with different execution priority levels. The scheduling circuitry organizes the compute tasks into groups based on priority levels. The compute tasks may then be selected for execution using different scheduling schemes, such as round-robin, priority, and partitioned priority. Each group is maintained as a linked list of pointers to compute tasks that are encoded as queue metadata (QMD) stored in memory. A QMD encapsulates the state needed to execute a compute task. When a task is selected for execution by the scheduling circuitry, the QMD is removed for a group and transferred to a table of active compute tasks. Compute tasks are then selected from the active task table for execution by a streaming multiprocessor.

In between network devices interconnected by plural optical channels, logical paths are defined according to upper traffic and also priority of the traffic. The network device includes: a frame forming section for reading user packets out of a buffer section composed of plural buffers defined for the respective paths on transfer schedule, and forming path frames having a specified frame length and individual ordinal numbers with respect to each path; a switch for selecting output channels to equally distribute the path frames by round robin scheduling; and data transmitting part for transmitting data on the logical paths. Thus, it is made possible to realize a frame transfer system capable of performing data transmission, which satisfies QOS (Quality Of Service) required for user traffic, on the WDM networks connected by plural OCHs.

Provided is a multicore processor system comprising a plurality of central processing units and a plurality of level-one hardware message queue groups. Each central processing unit is separately connected to a level-one hardware message queue group and is used to process the messages of said level-one hardware message queues; each level-one hardware message queue group comprises a plurality of level-one hardware message queues; within each level-one hardware message queue group, level-one hardware message queues having highest priority are scheduled with priority, and level-one hardware message queues having identical priority are scheduled in a round-robin rotation according to round-robin scheduling weights. The multicore processor system of the present invention enhances the efficiency and performance of multicore processor systems.

The invention discloses a service quality-based resource round-robin scheduling method. The method comprises the following steps that: (1) a macro base station divides the frequency band of the whole system into a frequency band special for a femtocell, a frequency band special for a macrocell, and a frequency band shared by the femtocell and the macrocell; (2) the resource allocation priority ofa user is determined according to the service quality requirement of the user; (3) the round-robin scheduling is performed on the femtocell user and the macro user until the frequency band special for the femtocell and the frequency band special for the macrocell are completely allocated; and (4) a frequency spectrum resource is not allocated to the macro user and the femtocell user by round-robin scheduling, and a certain frequency band is allocated to the scheduled user from the shared frequency band until the shared frequency band is completely allocated. In the method, the service qualityrequirement of the user using different services is referenced, and the frequency spectrum is allocated to the high-priority user, so that the high-quality resource block meeting the signal to interference ratio (SIR) requirement is obtained, the utilization of the frequency spectrum is more reasonable, and the resource utilization rate is improved. Therefore, the system throughput is improved.

In some implementations, a method implemented in an eNodeB base station (eNB) for a single carrier frequency division multiple access SC-FDMA within a wireless system includes receiving information within an SC-FDMA uplink shared channel signal on a recurring scheduling request resource. The received information comprises a user ID. A message granting at least a portion of an SC-FDMA resource is transmitted to a UE associated with the user ID.

A wireless hierarchical heterogonous pico-net providing communication between smart-phone based analysis and control application and multiplicity of sensors and actuators embedded in the ski equipment is described. The topology of this pico-net comprises two layers of hierarch, where the first layer is configured as a Bluetooth wireless network using a Round-Robin scheduling method and consisting of a single master and up-to seven slaves, and the second layer of the hierarchy is configured as a sub-nets consisting of multiplicity of sensors and actuators and communicating internally using ANT personal area network (PAN) wireless interface, or via a digital wire interface. Such network topology provides deterministic latency of a hierarchy a single-hop Bluetooth network, irrespective of the numbers of sensors and actuators embedded within each sub-net of the second layer of hierarchy. The network latency is upper-bounded by the number of slaves in the first layer of hierarch, Furthermore, the Round-Robin scheduling method is supplemented with the gating-off the slave RF transmission when the slave has no data to send, or when the difference between current sensor samples and the previous sensor sample is smaller then predefined threshold. Such discontinued transmission lowers slave power consumption system interference.

The invention discloses a workshop constant temperature and humidity system and a control method of the workshop constant temperature and humidity system. The workshop constant temperature and humidity system comprises a general setting module, a temperature and humidity unit module, a control module, a power module, at least one channel and at least one air outlet module, wherein each air outlet module is connected with the temperature and humidity unit module by a channel, and each channel is internally provided with a valve; the air outlet module comprises a temperature sensing module, a humidity sensing module, a branch setting module and an air outlet; when the workshop constant temperature and humidity system works, the temperature and humidity unit module is firstly controlled to supply air for all the air outlet modules by the control module according to the temperature value and the humidity value which are set by the general setting module until the temperature values and the humidity values of all the air outlet modules are equal to those set by the general setting module; after that, the opening and closing of the valves in the channels and the air supply of the temperature and humidity unit module can be controlled according to the temperature value and the humidity value which are set by the branch setting module on the basis of the round robin scheduling algorithm. The workshop constant temperature and humidity system and the control method of the workshop constant temperature and humidity system are simple in structure and convenient to operate, and can locally adjust the temperature and the humidity.