407results about How to "Guaranteed balance" patented technology

A closed two-wheel motorcycle including a closed cab with a door arranged around the motorcycle structure and having retractable floors for the driver's feet, separated from each the other, which can be depressed toward the ground and are resettable by spring members is presented. Each retractable floor is connected with an external rocker arm hinged at a rear section of the motorcycle and a sliding member guided by a sleeve at a front section of the cab. The spring members operate between an upper portion of the sliding members and the front section of the cab, while locking brakes cooperate, at rest, with the sliding members for holding depressed the floor portions against the action of the spring members.

The invention discloses a dynamic resource allocation method based on evolutionary game in a mobile edge computing system. The method comprises the following steps that (1) a network is divided into a plurality of areas according to the network coverage condition, accessible service points in the areas are different, and a centralized controller is arranged in the network; (2) terminals with the task unloading need in the same area form a population, and the terminals in the population establish task unloading cost functions; (3) all terminals in each population randomly select accessible SPs in an SP selection strategy set; the evolutionary game is established in each population in the network; (4) the terminals in each population compute task unloading costs and send the SP selection strategies and the cost information to the controller; (5) the population carries out SP selection strategy update according to dynamic copy; and (6) the dynamic copy reaches evolution equilibrium. The method fully utilizes the computing resources and the radio resources of the SPs, aims at the equal task unloading costs of all terminals in the populations and meets the task unloading need of each mobile terminal based on the evolutionary game.

The invention discloses a remoulding soft clay sample preparation device and a remoulding soft clay sample preparation method based on a vacuum combined electron-osmosis effect. Nonwoven geotextile, a gravel layer, a sand mat layer and an electron-osmosis cathode are sequentially paved on an osmosis drainage base; the upper and lower ends of a latex film are respectively turned outward and sleeved on a sample loading solidification cylinder and are fixed with the osmosis drainage base by a bolt through a flange; a water vapor separation cylinder is provided with an electric contact vacuum member and is connected with the osmosis drainage base and a vacuum pump respectively through an air pipe; slurry is poured into the designated height of the sample loading solidification cylinder, and an electro-osmosis anode is put in; and the electro-osmosis anode and the electro-osmosis cathode are respectively connected with a programmable direct-current power supply by wires. Under the combined effect of vacuum negative pressure and electro-osmosis, the drainage solidification speed of a soil body is increased, and the solidification stress level in a soil body sample preparation process can be adjusted. According to the device and the method disclosed by the invention, the size of a sample tank is reduced, and meanwhile, the number of sample preparation each time is increased by preparing multiple groups of soil samples; the device has a simple structure and is convenient for operation and sample taking; and the sample preparation period is short, and secondary cutting, disturbance and waste of soil samples are effectively avoided.

The invention relates to a method for realizing automatically compiling train working diagrams of the urban rail train, which comprises configuring basic parameters required by compilation, configuring ideal running intervals of each time period in one day, adjusting ranges of the time periods, determining starting time and terminal time of each running line, pre-connecting the running lines, regulating the starting point according to the number of rolling stock, compiling running lines of entering / exiting the garage of the train, and then diagramming a train working diagram. Compared with the prior art, the method has the advantages that, by regulating the time periods into integral multiple of the running intervals, the balance of diagramming transient running line of the peak hours and the non-peak hours is guaranteed, further, the compiling software is enabled to automatically diagram urban rail train working diagrams with balanced running intervals and capability of furthest meeting requirements of passenger flow in various time periods under restriction of conditions of the number of rolling stock, reentrant time, reentrant mode and the like, thereby significantly increasing the compiling efficiency of train working diagrams to be adaptable to requirements of train working diagram regulation along with variation of passenger flow, technical equipments and transport organizing methods.

The invention relates to the technical field of civil engineering construction, in particular to a construction method of an ultra-deep underground diaphragm wall in a water-rich soft-soil area. The construction method comprises the following steps: making an analysis and research on the stability of trench walls of the underground diaphragm wall and doing relevant preparations, preparing wall protecting slurry, building a guide wall, performing trenching construction, wall cleaning and sediment removal, manufacturing and hoisting reinforcing cages, backfilling joints between trench sections, and pouring wall concrete. According to the construction method, through a stability analysis method that introduces strength reduction, the security coefficients of stability of the trench walls are calculated based on a finite difference method; through parameter-reduction circular calculations, not only the limit stress and large deformation state of the trench walls but also the stability coefficients of the trench walls are obtained, which has practice guiding significance in construction; and the results are simple and practical and conform to the habits in the engineering field, and the stability requirements of the trench walls are effectively guaranteed, so that the engineering construction can be completed safely and fast with high quality.

The invention provides a protective device of a power battery, which solves the problem that the whole battery pack forms a short-board effect because the environmental temperature difference between single batteries causes the effectiveness reduction of single batteries in the process of charging and discharging a battery pack of the power battery in the prior art. The protective device comprises a closed battery box inside which a liquid is contained, wherein the battery pack is immersed into the liquid inside the battery box. The invention also provides a protective method of the power battery, comprising the step of immersing the battery pack of the power battery into the liquid. The protective device or the protective method can equalize the environmental temperature of all single batteries in the battery pack, avoid the problem of the single batteries, prevent the short-board effect, prolong the service life of the batteries and also achieve the effect of fire prevention because of the liquid sealability of the liquid.

The embodiment of the invention discloses a method for selecting an attached mobile management entity for user equipment, and a method and a device for providing load information, wherein one method comprises the following steps: sending a load information request to at least one mobile management entity allowing service access; receiving the load information response returned from the at least one mobile management entity, wherein the load information response carries with the load information of the mobile management entity; and selecting the attached mobile management entity for the user equipment from the at least one mobile management entity according to the load information. The other method comprises the following steps: receiving the load information request sent by a base station; acquiring the load information; and returning the load information response to the base station according to the load information request, wherein the load information response carries with the load information. The methods and the device can effectively use resources and ensure the balance of MME loads in an MME pool.

The invention provides a battery energy storage system for peak load shifting and a control method thereof. The system comprises M energy storage modules, wherein M energy storage modules are mutually connected in parallel, each energy storage module comprises a battery pack and a bi-directional converter, the direct current end of the bi-directional converter is connected with the battery pack, the alternating current end of the bi-directional converter is connected with a power grid, and M is the integer greater than 1; and a monitoring module, wherein the monitoring module is respectively connected with the battery pack and bi-directional converter in each energy storage module, the monitoring module is used for obtaining the charging and discharging power demand curve and current stress optical coefficients (SOC) of M battery packs, and performing the start and stop control and power distribution to M energy storage modules according to the charging and discharging power demand curve, the current SOC of M battery packs and the power-efficiency curve of each energy storage module. The system is formed by connecting multiple energy storage modules in parallel, so the peak load shifting capacity is enhanced, the stability and safety of the power grid are obviously improved, and the redundancy and applicability of the system are improved.

The invention relates to a storage battery non-damage rapid balanced charger and a control strategy thereof, belonging to a switch power supply type charger and a control method thereof. The storage battery non-damage rapid balanced charger comprises a utility power interface, a charging interface, a rectification circuit, a filtering voltage-stabilizing and current-stabilizing circuit, a micro-processing unit, a power factor correcting circuit, an intelligent half-bridge chopper circuit, a reverse-pole discharge circuit and a storage battery parameter dynamic sampling circuit; the control strategy comprises the steps that when the utility power interface is connected with utility power, the micro-processing unit can acquire the information of a storage battery by the storage battery parameter dynamic sampling circuit; after the sampling information is acquired, the micro-processing unit is used for pretreating the sampling information, and the maximum initial charging current which is allowed by the storage battery at the moment is calculated; and after the maximum initial charging current value is obtained, the micro-processing unit can be used for rapidly charging the storage battery. The charger can track the dynamic change of the internal parameters of the storage battery immediately according to the control strategy, and leads a charging object of the storage battery to be controlled to be a unit single body by adopting a secondary wave-chopping sectional control method and a positive and negative pulse rapid charging technology, thus having the advantages of non-damage rapid balanced charging and the like.

The invention discloses a structural support of a ball screw assembly, which can ensure that the ball screw assembly is pre-stretched and a supporting bearing has a preload. The structural support comprises a base. The base is fixedly provided with a motor supporting seat and a bearing holder; the motor supporting seat is arranged at the left side of the bearing holder; the motor supporting seat is internally fixedly provided with a left end supporting bearing; the bearing holder is internally fixedly provided with a right end supporting bearing; the left end supporting bearing and the right end supporting bearing are both rotatably provided with ball screw assemblies; the ball screw assemblies are provided with left steps and right steps; the left steps are positioned at the left side of the right steps; the left ends of the ball screw assemblies extend to the left side of the left end supporting bearing; the right ends of the ball screw assemblies extend to the right side of the right end supporting bearing; the left ends of the ball screw assemblies are in transmission connection with a servo motor through a coupler; the left end of the motor supporting seat is fixedly provided with a left end cover; the left end of the external circle of the left end supporting bearing supports against the right end of the left end cover; the right end of the external circle of the left end supporting bearing supports against the motor supporting seat.

The invention discloses a diving mask which comprises a face frame and a transparent face shell. The face frame is fastened with the transparent face shell, the upper end of the transparent face shell is connected with a communicating pipe, an exhaling channel and a breathing channel are arranged in the communicating pipe, a valve is arranged at the upper end of the communicating pipe and comprises a first pipe and a second pipe, the first pipe is communicated with the exhaling channel, a first floating ball is arranged in the first pipe, the second pipe communicated with the breathing channel, a second floating ball is arranged in the second pipe, a silica gel mask is fastened on the inner side of the transparent face shell, a left air valve hole and a right air valve hole are formed in the silica gel mask, communicated with the exhaling channel and the breathing channel and provided with air valve plates. A user can more smoothly breathe when wearing the diving mask to dive.

The invention provides a pneumatic drying method and equipment thereof for realizing large-flow tobacco material puffing drying treatment; the method comprises the following steps: puffed tobacco material is conveyed to a drying pipe for being dried by hot air flows, and then the tobacco material is separated from hot sir; the drying pipe is composed of a horizontal drying pipe and a vertical drying pipe of which the cross section is more than the cross section of the horizontal drying pipe; hot air with the temperature at 100-250 DEG C and air flow speed of10-50m / s of is sent in the horizontal drying pipe, wherein the air flow feeding direction is vertical to the material feeding direction; the material driven by hot air flows enters in the vertical drying pipe and is ascended in a suspension way, and the ascending speed of the material is reduced to 0.5-5m / s; meanwhile, sundries such as slivers with large density in the material can not be suspended and are separated pneumatically under the wind speed. By arranging the vertical drying pipe with large caliber, the speed of the material, moving upwards along the air flow direction, is reduced, on the premise of not increasing the drying route, the drying time of the material is prolonged, heat-transferring and mass transferring coefficient is improved, and the drying time of the material is improved.

The present invention discloses a network adaptive coding adjustment method and a network adaptive coding adjustment device. The network adaptive coding adjustment method comprises the steps of: acquiring, by a terminal, a media frame, putting the media frame into a buffer queue, and calculating a current bandwidth and a current network congestion level; judging a data rate adjustment type according to the current bandwidth and the current network congestion level, and calculating coding adjustment parameters, wherein both adjusted data rate values and adjusted frame frequency values need to be calculated, in this way, when the data rate is adjusted downwards, frame frequency is correspondingly reduced, thus the problem of deteriorated image quality caused by reduction of the data rate can be effectively solved, and when the data rate adjustment type is downward adjustment, the data rate value needing to be adjusted downwards is calculated based on the current bandwidth, thus the maximal bandwidth utilization rate can be achieved as far as possible while process is ensured; and performing, by the terminal, coding configuration adjustment based on the calculated coding adjustment parameters. Through adoption of the above network adaptive coding adjustment method, coding configuration is adjusted in an adaptive bandwidth mode, thereby reducing transmission of invalid media frames, and improving smoothness.

The invention discloses a zero-point calibration method for a hot continuous rolling machine frame. In the method, the current gap between rollers is smaller than the sum of the maximum extension length of an oil cylinder piston and the maximum bouncing value of the machine frame; an upper roller and a lower roller approach to each other through a position closed-loop system of a pressing position controller; the pressing position controller is automatically switched into a pressure closed-loop state; the rollers are continuously pressed under the pressure closed-loop by a method for progressively increasing a small rolling force every time; the average rolling force and roller gap on the two side in the time period are calculated; the pressing position controller is automatically switched to a position closed-loop state; and the rollers are moved downwards while the roller gap difference is kept until the zero-point calibration is completed and the rollers are uplifted. In the method, the rollers are leveled once before the zero-point force pressing, so that the balance state during the zero-point calibration is improved; and a circulation of the roller balance test and recalibration at the zero-point position is added after the first zero-point force pressing process is finished, so that the balance state of the rollers at the zero-point position is guaranteed.

An apparatus for automated walking training includes a frame or treadmill having a driven treadmill belt and a pelvis attachment to support a position and weight of a user. The pelvis attachment includes a displacement unit for allowing a movement of the user's pelvis held by attachment elements transverse to and / or rotating about a perpendicular axis to the walking direction of the treadmill to provide a more natural and physiological gait during training. A weight suspension unit having a cable guided over a guide roller positioned above and attached to the pelvis attachment may include a displacement unit adapted to move the guide roller perpendicular to the diverted section of the cable to influence the transverse position of an upper body of the user as well as to prevent a pendulum effect of the trunk of his body.

The invention relates to a multi-path high-speed serial interface controller. The multi-path high-speed serial interface controller comprises a front-end high-speed universal serial bus, a main control logic, and a back-end multi-path high-speed serial interface. The back-end multi-path high-speed serial interface is accessed to the front-end high-speed universal serial bus through the main control logic. The invention provides a multi-path high-speed serial interface controller that extends the high-speed universal serial bus into a high-speed serial interface of a system user-defined protocol, increases the data communication rate, and improves the central control function.

The present invention aims to provide a transmission device that, in a communication system using multilevel modulation with 2̂n levels (n being an integer greater than or equal to two), limits the run length to a predetermined value or less and guarantees DC balance.The transmission device, which transmits data to which 2̂n amplitude modulation has been applied, separates data for transmission into n data sequences; encodes one of the n data sequences to guarantee run length, thereby generating a converted data sequence; generates an intermediate data sequence by either inverting or not inverting a specific data sequence so that, based on candidate data, the next output voltage guarantees DC balance; and applies 2̂n amplitude modulation to n-bit symbols each of which has a bit in the intermediate data sequence as a most significant bit and bits in the remaining data sequences, excluding the specific data sequence, as subsequent bits.

The present invention relates to a dual-path road network individuation inductivity distribution method under a user equalization principle. The method comprises the following steps: 1) aiming at a regulated dual-path road network, performing statistics of road network basic parameters; 2) based on the GreenShields model and the traffic flow theory, solving an optimal separation rate under an ideal condition according to the road network basic parameters to optimize the whole traffic flow of the road network; 3) under the constraint condition of the whole optimal road network, establishing the basic constrained condition of an individuation induction distribution strategy according to the proportion of an individual vehicle historical driving optimal paths; 4) establishing the concept of the vehicle priority, and calculating the individuation induction rate distribution value under the known condition of the vehicle priority through adoption of the equal difference distribution principle according to the concept; and 5) according to the distribution principle determined in the step 4) and the probability distribution of the vehicle historical optimal ratio, distributing the induction information. The dual-path road network individuation inductivity distribution method under the user equalization principle satisfies the user equalization principle to the utmost extent under the probability meaning to ensure the fairness of vehicle induction acceptance.

The invention discloses a flexible job shop scheduling machine selection method based on a processing time grade. According to processing time, grade division is performed on optional machines of each process. All the processes are arranged randomly so as to acquire a plurality of machine selection schemes. When the machines are selected for the processes, the grade of the machine which is selected preferentially is set to be highest. An intersection of a preferential grade machine set and a minimum load machine set is calculated. If the intersection is not empty, one machine is selected in the intersection optionally; otherwise, the machine is searched for the next process. If the machine intersection after all the processes are traversed is empty, the grade of the machine is reduced to a lower grade. Machine load balancing is considered, and simultaneously the machine whose processing time is short is selected as far as possible so that guarantee is provided for target functions of process ordering optimization, better maximum completion time acquisition and the like. The method can be applied to other flexible resource distribution practical problems containing distribution equalization and a total resource amount.

Provided is a measurement method for the effective extraction radius of a drill hole. Firstly, the drill hole perpendicular to a coal bed is formed, and the original gas pressure of the coal bed is measured. Secondly, four extraction drill holes perpendicular to the coal bed are formed around the drill hole according to the sequence from the near point to the far point, and connection extraction is performed immediately after the construction is completed. Meanwhile, the drill hole is filled with SF6 gas through a pressure gauge switch outside the pressure measurement drill hole, it is guaranteed that the gas pressure in the drill hole is the original gas pressure of the coal bed, and measurement conditions of a radial steady flow field are created. The time for observing the SF6 at different interval conditions of the extraction observation hole and a gas filling hole is recorded, and expansion ranges of different gas flow fields and the corresponding time are determined. The effective extraction radius at different time is determined according to a gas pressure distribution rule and the maximum allowance gas pressure in the flow field, and then the relation between the effective extraction radius of the drill hole and the pre-extraction time is obtained. The measurement method provides a basis for design of the extraction drill hole, and improves the effect of gas extraction of the coal bed.

The invention provides a peanut milk nutrient solution prepared from a peanut meal protein extracting solution. The nutrient solution consists of the following raw materials in percent by mass: 15-25 percent of peanut meal protein extracting solution, 3-5 percent of skim milk powder, 3-7 percent of white granulated sugar, 0.15-0.25 percent of compound stabilizer, 0.04-0.07 percent of essence and the balance of water. The peanut meal protein extracting solution is prepared by the following methods: drying the degreased peanut meal, grinding the peanut meal into peanut meal particles with the granularity of 20-100 meshes, and extracting the peanut meal protein extracting solution by adopting an enzyme extraction method or an alkali extraction method. The peanut milk nutrient solution is rich in nutrition and fragrant in taste, animal proteins in milk and vegetable proteins in peanut are effectively combined, an effect of complementing nutrition is achieved, the balance of amino acid composition is guaranteed, and the utilization rate and nutritive value of the peanut protein are improved.

The invention discloses a method for hoisting a steel dome of a nuclear power plant in a balance-keeping manner. The method is realized by cooperation of a balance hosting device of the steel dome of the nuclear power plant and hoisting machinery and comprises the steps of assembling in place, trial hoisting, hoisting and the like. A plurality of adjustments are carried out in each step to stress related components in a balance-keeping manner, so that the stability of the hoisting process is ensured. The method can ensure the balance of multi-point hoisting stress and accuracy of levelness of a lower opening of the dome, is applicable to hoisting and mounting of the dome of a containment of the nuclear power plant, is used for ensuring the balance of hoisting stress and accuracy of levelness of the lower opening of the dome, and is also applicable to the hoisting process of other spherical segment and spherical coronary objects.

The invention belongs to the technical field of edge computing, particularly relates to an edge computing task cooperative scheduling method, system and device, and aims to solve the problems that anant colony algorithm is prone to local optimization and cannot well solve the problems of low resource utilization rate and unbalanced virtual machine computing resource load in an edge environment. The method comprises the steps of obtaining a scheduling queue of an edge computing task, and initializing related parameters; starting from the first ant in the ant colony algorithm, obtaining a feasible solution of the current ant; if the solution is the optimal feasible solution, updating the optimal solution and the shortest task maximum completion time; updating local pheromones until all antscomplete solution searching; carrying out global pheromone updating, and carrying out local optimization in an iterative mode until the set number of iterations is reached, and obtaining a globally optimal feasible solution and the corresponding shortest task maximum completion time are obtained. According to the method, the ant colony algorithm is further prevented from falling into local optimum too early, and load balance, reasonable task scheduling and efficient resource utilization are guaranteed.

A method for identifying superheater model parameters based on data drive belongs to the technical field of information processing and comprises the following steps: establishing a non-linear lumped parameter model of the boiler superheater and determining the known boiler operation state parameters and the parameters needing to be identified; carrying out bad pixel processing and data smoothing on the known boiler operation state parameters to obtaine a real-time database of the known boiler operation state parameters; establishing training sample databases in n-numbered different load sections and normalizing the parameters; establishing a corresponding RBF neural network model aiming at each training database and connecting n-numbered RBF neural network models in parallel to form a hybrid network; extracting the actual measured value of the superheater system at the present moment and carrying out online parameter identification on the RBF neural network models; and updating the RBF neural network models every t. The method avoids the defect of adopting the fixed parameters in the conventional superheater models, realizes real-time identification of the parameters of the models and ensures the identification precision of the parameters of the models.

The invention discloses a high-permeability renewable energy cluster division method considering flexibility. The method comprises establishing a flexibility supply and demand model; based on flexibility balance demand and flexibility balance time characteristics, providing a cluster flexibility supply and demand balance index and a flexibility balance time index respectively; and by combining a modularity index reflecting cluster structure characteristics, establishing a cluster division index system considering cluster flexibility balance dynamic characteristics. The advantages are that thesource network load flexibility resource adjustment capability can be fully considered and the node coupling structure characteristics are comprehensively considered, so that cluster autonomy capability is given full play to, a cluster is reasonably divided, the cluster flexibility demand is reduced, and the speed and accuracy of operation and regulation of a power distribution system under the background of increasing complex high-permeability renewable energy access are improved favorably.

The invention discloses a resource allocation method and a multi-mode controller. By the method, when a plurality of wireless access systems are subjected to co-transmission, the reasonableness of allocating resources to data streams in the wireless access systems is improved, and the resource utilization rate and system throughput are improved. The method comprises the following steps of: determining the data sending amount and data request amount of each data stream in a transmission path in the current period; determining the total data sending amount and total data request amount of the transmission path in the current period according to the data sending amount and data request amount of each data stream; and determining the data request amount of each data stream in the transmission path in the next period according to the data sending amount and data request amount of each data stream in the current period, the total data sending amount and total data request amount of the transmission path in the current period, and the allocation bandwidth of the transmission path. Through the technical scheme, the reasonableness of allocating the resources to the data streams in the wireless access systems is improved, and the resource utilization rate and system throughput are improved.

The invention discloses a Wifi probe and a data balanced collection system and method. The data balanced collection method includes the steps that the Wifi probe sequentially scans Wifi channels in a detection area of the probe in a rotary mode to obtain broadcast data packages of devices in the Wifi channels; the Wifi probe uploads the obtained broadcast data packages to a server. By means of the rotary scanning mode of the Wifi channels, different scanning time is allocated to different Wifi channels according to a single factor or multiple factors so that the balance degree of data collection can be guaranteed to the largest extent; before the data is uploaded to the server, the data is preprocessed, invalid information in the data is removed, only valid information is kept, the data transmission magnitude can be greatly reduced, the transmission cost is reduced, and subsequent quick and accurate data analysis is benefited.

The invention discloses an abrasive belt machine. The abrasive belt machine comprises a frame, driving wheels, contact wheels, abrasive belts and servo motors; the driving wheels, the contact wheels, the abrasive belts and the servo motors are symmetrically arranged on the frame; each servo motor is connected with the corresponding driving wheel; each abrasive belt is arranged on the corresponding driving wheel and contact wheel in a sleeving mode; each contact wheel is driven by the corresponding driving wheel to run; each abrasive belt is driven by the corresponding contact wheel to run; one side of each contact wheel is provided with a contact wheel pressure control mechanism; one side of each abrasive belt is provided with an abrasive belt tension control mechanism; one side of the abrasive belt machine is connected with a PLC (Programmable Logic Controller) control box. According to the abrasive belt machine, the double-head double contact wheels can be rapidly replaced or automatically switched for different curved surfaces during use conveniently; the abrasive belt tension control mechanisms are controlled by a precision pressure reducing valve, the tension of the abrasive belts can be automatically adjusted when the resistance is produced so as to enable the tension to be stabilized within a set value, and accordingly the smooth operation of the abrasive belts is ensured and the service life of the abrasive belts is extended; the abrasive belt machine is provided with the contact wheel pressure control mechanisms, the contact wheels are rubber coating wheels, and accordingly the full contact of the complex curved surfaces can be implemented during polishing, the elasticity is achieved, and workpieces are not easy to damage.

The invention provides a DNA amplification method. The DNA amplification method is characterized by comprising the step that a T7 promoter sequence is added to the target DNA tail end. According to the DNA amplification method, amplification can be conducted on DNA smaller than one nanogram or even a single cell genome DNA on the basis of trace DNA; relatively even amplification is achieved through the target DNA containing the T7 promoter sequence; an error produced in the amplification process can be effectively removed.

The present invention discloses a D2D (Device-to-Device) link selection method of social information fusion in multi-cell scenes. The method comprises the following steps: the step 1: performing degeneration of multi-cell D2D communication scenes into D2D communication scenes for coexistence of two cells of origin for researching, performing classification of users through a base station according to the user position distribution in a network to allow the users to perform interference distinguishing; the step 2: employing an alliance having untransferable effectiveness to form a game to perform link selection for an in-cell D2D pair of the same cell where two users are located; and the step 3: performing link selection of cross-cell D2D pairs of two cells where two users are located, and considering the equalization of the cross-cell D2D pairs for the link resource usage of the two cells in the link selection process. The link selection method is simple to realize and small in signaling cost, and can ensure the equalization of the cross-cell D2D pairs for the link resource usage of two cells.