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75 results about "Round-robin scheduling" patented technology

Round-robin (RR) is one of the algorithms employed by process and network schedulers in computing. As the term is generally used, time slices (also known as time quanta) are assigned to each process in equal portions and in circular order, handling all processes without priority (also known as cyclic executive). Round-robin scheduling is simple, easy to implement, and starvation-free. Round-robin scheduling can also be applied to other scheduling problems, such as data packet scheduling in computer networks. It is an operating system concept.

System and method for regulating message flow in a digital data network

InactiveUS7283471B2Fairness among all virtual circuits for buffer resourcesStop transmissionError preventionFrequency-division multiplex detailsDigital dataPathPing
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.
Owner:AVAGO TECH INT SALES PTE LTD

CTC station autonomous controlling machine with self-learning system

The invention relates to a CTC station autonomous controlling machine with a self-learning system. The station autonomous controlling machine comprises a central communication module, an operation processing module, a schedule receiving and storing module, a round-robin scheduling module, a code bit processing and bus number tracking module, an automatic routing decision module, an interlocked logic check output module and an acquisition/output module, wherein the central communication module is connected with the operation processing module and the schedule receiving and storing module respectively; the operation processing module, the round-robin scheduling module and the code bit processing and bus number tracking module are all connected with the automatic routing decision module; the automatic routing decision module is connected with the interlocked logic check output module, and the interlocked logic check output module is connected with the acquisition/output module; and the acquisition/output module is connected with the code bit processing and bus number tracking module. The CTC station autonomous controlling machine with the self-learning system has improved automation, certain artificial intelligence, and improved accuracy and efficiency during use at a station of a busy mainline.
Owner:CASCO SIGNAL

Wireless Hierarchical Heterogeneous Pico-Net for Ski Control Systems

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.
Owner:IPCOMM

Service quality-based resource round-robin scheduling method

InactiveCN102098792ASpectrum utilization is reasonableIncrease capacityWireless communicationQuality of serviceFrequency spectrum
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.
Owner:XIDIAN UNIV

Low-feedback multi-user scheduling method in cooperative multicast MIMO transmission

The invention relates to a low-feedback multi-user scheduling method in cooperative multicast MIMO transmission. The method comprises the following four schemes: (1) NUS, (2) Large Scale, (3) Local-NUS and (4) Local-Large Scale; and the four schemes are respectively based on different channel feedback information and have a unified executive process. The method is a scheduling method for selecting a plurality of service users in the spatial domain, and ensures the fairness among different users by combining an opportunistic round-robin scheduling method on a time domain; the scheduling process is as follows: 1. initialization, the user with best channel condition is selected as a first user according to the feedback information; 2. a scheduling user set is iteratively selected from the rest users based on the selected user until the given stopping criterion is met; and 3. the selected user is eliminated based on the opportunistic round-robin scheduling method, and the step 1 and the step 2 are repeatedly carried out. Compared with the cooperative scheduling method based on the complete channel information, the method has no high performance loss but remarkably reduces the feedbackquantity of the system; and compared with the non-cooperative system, the invention can greatly improve the system performance.
Owner:BEIHANG UNIV

Data scheduling method used in EPON terminal system and based on absolute priority

The invention relates to a data scheduling method used in an EPON terminal system and based on absolute priority. The EPON terminal system is a point-to-multipoint network system, comprises three parts: an end OLT, a terminal ONU and a passive optical divider, and is characterized in that: a. FIFOs used for data caching are added in the terminal ONU, and the number of the FIFOs is determined by the current priority number for data discrimination; b. address spaces are allocated in an external memory according to the priority; c. the terminal ONU transmits data to the end OLT, a transmission time slot for report frames used for bandwidth application is reserved at the tail part of a transmission time slot, and the number of data remained in the current system and to be transmitted can be accurately calculated when every time slot transmission is ended; d. when a higher priority comes, the current transmitted data is confirmed to be consistent with the data applied to be transmitted; and e. when end OLT allocates bandwidth more than the applied bandwidth to the terminal ONU, absolute priority scheduling can be selected or round-robin scheduling is selected to equally allocate the excessive bandwidth. Through practical operation and testing, the invention has the advantages that the effect is good, the bandwidth utilization ratio is high and the data transmission requirement of the EPON system is satisfied.
Owner:HANGZHOU KWIKTELETEC

Multicell self-adaption cooperative transmission method on basis of delayed feedback

InactiveCN102545987AResistance to performance deteriorationIncrease transfer rateSpatial transmit diversityFrequency spectrumInformation feedback
The invention discloses a multicell self-adaption cooperative transmission method on the basis of delayed feedback. The cooperative transmission method is carried out according to the following steps: firstly, an average movement speed of users in a plurality of cells which take part in cooperation is researched, a corresponding doppler frequency offset is calculated and a channel delay correlation coefficient is obtained; then one user is selected from each cell by round-robin scheduling to wait for data transmission and a codebook known by a base station end is generated for the user; the user estimates channel information and a path power attenuation factor by receiving a pilot signal sent by a base station and feeds back the information to the base station; and finally, the base station determines an adopted cooperative transmission mode according to the information fed back by the user and information of the calculated channel delay correlation coefficient and the like, completes precoding in a corresponding mode and carries out data transmission. The multicell self-adaption cooperative transmission method can be effectively applied to actual scenes and the reachable transmission speed and the frequency spectrum utilization rate of a system can be improved.
Owner:SOUTHEAST UNIV

Wireless hierarchical heterogeneous pico-net for ski control systems

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.
Owner:IPCOMM

Multi-cell joint adaptive modulation coding method based on round robin scheduling

The present invention discloses a multi-cell joint adaptive modulation coding method based on round robin scheduling. The method comprises the following steps of (1) calculating the user channel quality; (2) predicting the user channel quality; (3) at the current scheduling moment, enabling all base stations to schedule all users of each base station based on a round robin scheduling algorithm, and distributing the resource blocks to all users to obtain the resource scheduling lists of all base stations; (4) according to the resource scheduling lists obtained in the step (3), calculating the signal to noise ratios of all scheduled users at the current scheduling moment; (5) according to a mapping criterion between the signal to noise ratios and the modulation coding schemes, selecting the modulation coding schemes for the users. The multi-cell joint adaptive modulation coding method based on the round robin scheduling of the present invention can simulate the cofrequency interference of the users at the data transmission moment more accurately, so that the channel quality predication at the data transmission moment is more accurate, the selected modulation coding schemes can adapt to the channel states at the data transmission moment better, and the transmission performance of a system is improved effectively.
Owner:HOHAI UNIV

Workshop constant temperature and humidity system and control method thereof

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.
Owner:SUZHOU KANGHUA PURIFYING SYST ENG
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