37results about How to "Limit number" patented technology

The invention relates to a method of routing a call in a network having a plurality of nodes interconnected by trunks, the method including calculating the costs of different routes for taking the call, and selecting a route as a function of cost. According to the invention, the cost of a route is a function of the bandwidth available on the trunks making up the route, of the resources available on said trunks, and of the bandwidth required for the call. The cost of a trunk can be represented in the form of a vector whose first component is a decreasing function of the available bandwidth, and whose second component is a decreasing function of available resources. The invention makes it possible, when routing a call, to take account of quality of service in terms of bandwidth. If the second component is a function that has a value that is constant above some quantity of available resources, then the invention makes it possible to limit the number of routing calculations performed, and to avoid making new routing calculations so long as the topology of the network remains unchanged.

The invention relates to a method for coordinated multi-point transmission and reception. The method comprises the following steps of: presetting a style set for coordinated multi-point transmission and reception on a base station; allocating a coordination base station group for each style in the style set, and correspondingly setting a selection condition, wherein the selection condition comprises a group of user terminal performance parameters and dereferencing requirements thereof; acquiring the dereferences of the user terminal performance parameters by a service base station for accessed user terminals to perform coordinated multi-point transmission and reception; selecting one style from the styles corresponding to the selection condition that the dereferences can meet; and performing coordinated multi-point transmission and reception on the user terminal by the coordination base station group allocated for the selected styles. Accordingly, the invention also provides the base station having the functions of coordinated multi-point transmission and reception. The base station comprises a coordinated multi-point module, a setting module and a selection module. The method and the base station can meet the performance requirements such as throughput, peak data rate and the like under different wireless communication environment conditions and effectively reduce system cost.

The application discloses methods and apparatuses in user equipment and a base station for wireless communication. The user equipment receives a first signaling and then receives a second signaling, and then operates a first wireless signal and a second wireless signal respectively in first time-frequency resources; the first wireless signal and the second wireless signal occupy a first resource unit set and a second resource unit set respectively; and the first signaling is used for determining whether the second signaling includes a first domain and the first domain is used for determining that a target resource element set belongs to the first resource unit set or the second resource unit set. According to the application, the first domain and the target resource unit establish connection, so that a phenomenon that blind decoding costs are caused by introduction of the extra control signaling because the user equipment obtains configuration of an auxiliary demodulation reference signal when the system carries out the auxiliary demodulation reference signal configuration is avoided. Therefore, the complexity of the user equipment is reduced and the overall performance of the system is improved.

A grid data transcription generation method which is based on time and spatial locality is the method for determining the number of data transcriptions in a grid and the distribution thereof on grid nodes based on behavioral characteristics of data access of a grid user, therefore, the method of the generation of the data transcriptions is carried out. The method determines the number of the data transcriptions in the grid and the distribution thereof on the grid nodes based on the behavioral characteristics of the data access of the grid user. The basic idea is to utilize the time locality distribution of the user access data to obtain the spatial locality among the data in the grid, then the number of the data transcriptions and the distribution principles are determined based on the spatial locality, and the various transcriptions of the data are further replicated and distributed. Therefore, the number of the transcriptions needed by the data and the distribution method of the transcriptions can be obtained according to the grouping situation of the data on a neighboring relationship diagram, thereby utilizing less number of the transcriptions and the effective distribution of the transcriptions to achieve the delay of the data access in the grid and to reduce the network bandwidth consumption.

The invention discloses a device for protocol conversion from Ethernet to an RS485 field bus. The device comprises more than two CPU (central processing unit) control modules, multiple RS485 interface modules and two Ethernet switch modules; each Ethernet switch module is respectively connected with each CPU control module; the multiple CPU control modules form a CPU redundancy system, only one CPU control module has the access control right of the field bus at any time; a CPU module and a CPLD (complex programmable logic device) module are provided in each CPU control module; multiple Uart signal output channels are arranged between the CPU module and the CPLD module; the CPLD module is connected with the RS485 interface module the number of which is same as that of the uart signal channel; the CPU module has three states as follows: a master state, a standby state and a failure state, and the CPU module sends a master indicator signal and a reset signal to the CPLD module by the command control.

The invention provides an efficient communication method and system applied to a blockchain. Nodes of a blockchain network are divided into a plurality of node sets which are organized through a balance tree structure, a new node is added to a balance tree at random and taken as a leaf node of the balance tree, and the newly generated balance tree is broadcasted to other nodes in the balance tree. A root node can generate a new balance tree at random according to the balance tree at regular time, and sends the addresses of other root nodes in the blockchain network stored by the original root node to the root node of the newly generated balance tree. Only a parent node and a child node in the balance tree directly communicate, so that the problem that p2p communication used by the blockchain occupies too much bandwidth is solved. Meanwhile, the number of balance tree nodes is limited, and the blockchain is prevented from tending to be centralized.

The present invention builds on the implications of variability in flow durations on the stability of load-sensitive routing. In accordance with an embodiment of the present invention, long-lived flows of packets are routed dynamically while short-lived flows are forwarded on preprovisioned static paths. This hybrid approach can exploit flow-classification hardware at the edge of backbone networks and known techniques for flow-pinning, as well as basic insights from earlier work on QoS routing. This approach of separating short-lived and long-lived flows can dramatically improve the stability of dynamic routing.

The invention provides a loading flow control method used among gateways in a local, which includes the following steps of calculating the usable numbers for the virtual terminal marks among the gateways in the local; selecting a gateway pair according to the useable numbers when a soft exchange sets up an intermediate loading among the gateways in the local for the calling spanning the gateways in the local; and distributing the virtual terminal marks of the usable numbers on the selected gateway pair in the local, thus further controlling the loaded flow among the gateways in the local by the distribution on the number of the virtual terminal marks. The invention also provides a loading flow control device used among the gateways in the local.

The invention discloses a 9B/10B coding method suitable for low-pass and band-pass channels, which is used for coding a 9-bit source sequence set into a 10-bit target sequence set, and the 10-bit target sequence set does not contain balance sequences' 1010101010 'and' 0101010101 '. The 9-bit source sequence set comprises a first type of 9-bit source sequence set, a second type of 9-bit source sequence set and a third type of 9-bit source sequence set. The first type of 9-bit source sequence set only contains 9-bit source sequences with difference values of 1 and-1, and after one-bit data '0' or '1' is inserted into the same position of each sequence in the first type of 9-bit source sequence set, the sequence is coded into a 10-bit target balance sequence; the second type of 9-bit source sequence set selectively only contains 9-bit source sequences with the difference value of 3 or only contains 9-bit source sequences with the difference value of-3, one bit of data '0' or '1' is inserted into each sequence in the second type of 9-bit source sequence set, and a pair of 10-bit target unbalanced sequences with the difference value of +/-2 is coded.

A method and device for detecting faults in a transmission line by reflectometry, include the following steps: injecting into the transmission line a reference signal at an emission frequency f_DAC; collecting a reflected signal at a point on the transmission line; sampling the reflected signal at a sampling frequency f_ADC, the sampling frequency f_ADC being different from the emission frequency f_DAC; storing each point of the sampled signal at a memory address corresponding to an index assigned to the point of the sampled signal and according to a precomputed memory-address increment Δ, the memory-address increment Δ depending on the emission frequency f_DAC, on the sampling frequency f_ADC, on an over-sampling factor Ω and on a preset acquisition time Σ; repeating the storing step during the acquisition time Σ; and generating, from the points stored during the acquisition time, a recomposed signal able to be used to detect faults.

The invention discloses a non-uniform parabola array antenna design method, which comprises the following steps of: 1, constructing a mathematical expression of a parabola array antenna, and setting the aperture size of the array antenna, the number of array units and parabola related parameters; 2, calculating the positions of the array units with a minimum array element spacing constraint requirement; 3, calculating a radiation pattern of the parabolic array antenna, and calculating the highest sidelobe level of the radiation pattern to obtain a fitness function value; and 4, optimizing thepositions of the array units by using an invasive weed algorithm to obtain a design optimization result of the non-uniform parabolic array antenna. According to the non-uniform parabola array antennadesign method, the highest sidelobe level of a directional pattern can be reduced, the design difficulty of a feed network is greatly reduced, overlapping of adjacent array units is avoided, the mutual coupling effect of the array antenna is reduced, the minimum distance between the adjacent array units is restrained, and the size of the array antenna and the number of the array units are effectively limited.

This invention discloses a resistance field emission electron negative electrode part, which is characterized by that the electron negative electrode part is located with row electrode or line electrode and it sets resistance between the row and down electrode or line or down electrode. The feedback action of the resistance can stabilize the emission and when row electrode is loaded with negative voltage and the line electrode is loaded with positive voltage, the electron injects form down electrode to the transmission layer and is accelerated and achieves the upper electrode and the part of electrons passes the upper electrode and are emitted to the vacuum.

The invention relates to a preparation method of bis-hydroxypropyl neopentyl glycol ether and belongs to the technical field of organic compound synthesis. According to the technical scheme of the preparation method of bis-hydroxypropyl neopentyl glycol ether, neopentyl glycol is adopted as a raw material, and a product of bis-hydroxypropyl neopentyl glycol ether is adopted as a solvent. A 3-(4-methoxyphenyl) phosphine catalyst is added. After that, propylene oxide is adopted as a chain extender for the synthesis of bis-hydroxypropyl neopentyl glycol ether. The method is applied to the synthesis of bis-hydroxypropyl neopentyl glycol ether and has the advantages of high product content, low neopentyl glycol content, low content of allyl alcohol as a by-product, stable quality and the like.

An embodiment of the invention provides a database access method and a database access system. The system comprises a plurality of application servers, a plurality of access servers, a plurality of execution servers and a plurality of databases. Each application server is only connected with one access server, and each access server is connected with a plurality of databases through a plurality of execution servers. The plurality of databases comprise a first database in which the data of the first application is stored, and the number of connections between each application server and the access server is smaller than the number of connections between the execution server and the servers of the plurality of databases. In response to a service request initiated by the first application, the application server generates a first operation request for the first database; and the first operation request and a first identifier for indicating the first database are sent to the access server. Through adopting the database access method provided by the embodiment of the invention, a large number of applications can be supported, and an ultra-large user scale can be supported.

The invention provides an unmanned aerial vehicle energy supply scheduling method based on idle unmanned aerial vehicle replacement. The method mainly solves the problem that an existing unmanned aerial vehicle network cannot continuously provide service for a designated area and mutual influence between unmanned aerial vehicles is caused. The method comprises the following implementation steps: 1) initializing an unmanned aerial vehicle network; 2) the node determining an associated unmanned aerial vehicle according to a Max RSRP criterion; 3) initializing a scheduling window and a recall unmanned aerial vehicle set of each time slice t; 4) determining a recall unmanned aerial vehicle set of each time slice t; and 5) according to the recall unmanned aerial vehicle set of each time slice t, carrying out unmanned aerial vehicle energy supply in the specified area, if the current time slice number t is greater than the total time slice number M of the unmanned aerial vehicle system for providing services for the specified area, the unmanned aerial vehicle system stopping the services for the specified area, otherwise, returning to the step 3). According to the method, the influence between the unmanned aerial vehicles is avoided, the node service quality is guaranteed, the system energy consumption is reduced, and the method can be used for providing continuous services for a designated area through an unmanned aerial vehicle network.