1090results about How to "Reduce the probability of packet loss" patented technology

The invention discloses a software defined network (SDN)-based space network QoS guarantee method and a management center. An SDN-based space network is divided into a management layer, a control layer, and a forwarding layer, and includes a bottom-up information collecting process and a top-down strategy sending process. A satellite network management center in the management layer is an entity for making a QoS guarantee strategy, and the QoS guarantee strategy mainly includes the results in service grade authentication, traffic scheduling and bandwidth allocation, wherein service grade authentication is a process in which different service requests of users are distinguished according to the service grading standard, traffic scheduling is a process in which transmission paths meeting the QoS requirement are planned for data flows at different service grades, and bandwidth allocation is a process in which priority-based on-demand bandwidth resources are provided in a link sharing state. In addition, the invention provides a network status monitoring method in the control layer, which is the basis for the satellite network management center to make a QoS guarantee strategy. According to the invention, based on a controllable and manageable software defined network, space network resource allocation is optimized, on-demand service of the space network is realized, and the purpose of QoS guarantee is achieved.

The embodiment of the invention discloses a method for distributing cloud computing resource, a device thereof and a system thereof which are applied to a network which comprises a client, a decision-making entity and a plurality of front cloud servers. According to the embodiment of the invention, a first front cloud server in the plurality of front cloud servers receives a cloud application service request sent by the client, the first front cloud server is a front cloud server which provides cloud application service to the client, and the first front cloud server is determined by the decision-making entity according to the position information of the client, the state information of the plurality of front cloud servers and / or the corresponding network link state information between the client and the plurality of front cloud servers. The corresponding cloud application calculation processing is carried out according to the cloud application service request, the result of cloud application calculation processing is returned to the client, and the network delay and packet loss probability of a cloud calculation application can be reduced.

The invention discloses a message diversion processing method which is applied to a message diversion processing system comprising polycaryon network equipment. The method comprises the following steps: the polycaryon network equipment fetches quintuple information of a message; the polycaryon network equipment judges whether the message is a fragment message or not according to the fragment information of the message; if so, the Hash algorithm is carried out according to the source IP address, the destination IP address and the contents of the protocol of the message so as to acquire a virtual central processing unit (VCPU) corresponding to the message; if not, the Hash algorithm is carried out according to the source port, the destination port, the source IP address, the destination IP address and the contents of the protocol of the message so as to acquire the VCPU corresponding to the message; and the polycaryon network equipment processes the message through the acquired VCPU. Themethod enhances the message processing speed and efficiency of the polycaryon network equipment. The invention also discloses a device using the method.

The invention relates to a time slot optimization-based double-layer satellite network routing method, so as to solve the problems that routing protocol overhead in the traditional method is large, an LEO satellite is hard to be connected with a GEO satellite in a polar region, and temporary link breaking of a polar orbit satellite between polar region orbits is not considered. The method comprises steps: (1) a 3GEO+66LEO double-layer satellite network model is built; (2) a covering domain grouping + orbit plane clustering-based satellite grouping management method is applied to determine a control relationship between an upper layer of satellites and a lower layer of satellites; (3) according to the control relationship between the upper layer of satellites and the lower layer of satellites, time slot division and optimization are carried out on a satellite operation cycle; (4) on the basis of location prediction routing algorithm, the GEO satellites calculate a routing table for the LEO satellites; and (5) the first step to the fourth step are combined, and routing updating is carried out when each time slice starts. The method belongs to the field of satellite communication.

The invention relates to an alarm and blocking method for illegal external connections. The alarm and blocking method comprises that 1), an intranet host client monitors networking behaviors of intranet computers in real time according to a plurality of external connection modes; 2), the intranet host client initiatively sends an encrypted alarm data packet to an external connection alarm monitoring terminal by using a Libnet function library to detect whether the intranet computers have external connection behaviors and gives an alarm for illegal external connection behaviors; 3), the intranet host client performs bottom layer packet capture on alarmed intranet hosts to obtain all data packets passing through network cards of the hosts to judge the illegal external connection behaviors; 4), blocking the network cards of the hosts having the illegal external connection behaviors through judgment. The alarm and blocking method is high in timeliness and good in monitoring performance in the aspect of illegal external connection monitoring. By means of the alarm and blocking method, the safety and the transmission efficiency of the alarm data packets in systems are improved, leaking risks caused by stealing of alarm information are effectively avoided, meanwhile, the safety of software is improved, and the software has anti-shielding and anti-unloading capacities.

New layer of data link layer protocol - data link procedure (DLP) is introduced in the invention to realize syncretizing adaptation between Ethernet and SDH / SONET in order to overcome shortage of current adaptation technique including not matched interface speed, not supporting dynamic bandwidth allocation based on packets, and not possible to transmit SDH / SONET on Ethernet, not compatible to IP and packet voice service etc. The method realizes direct transmission of Ethernet on SDH / SONET, and SDH / SONET on Ethernet as well as realizes compatibility to IP network and packet voice network. Using safety mechanism, network control management mechanism, flow management mechanism provided by DLP realizes network management control function such as two layer protected rearrangement, performance management, fault management etc. The method makes current communication network transits to united public network in next generation of using packet switching technology smoothly.

The utility model relates to a distributed contention control backoff method for wireless local network based on probability P, belonging to the wireless communication technology. The method is based on the basic idea of executing backoff on the basis of nodes; by executing carrier monitoring mechanism, the nodes estimate the network congestion status; the time slot utilization ration is calculated according to the time slot number when the channel is busy and the total time slot number passed in the backoff process, and the congestion degree probability P is thereby determined; a value of the contention window of the nodes is arranged according to the value of the probability P and the node random number; each time after the nodes is sent successfully, the probability P is used to judge whether the contention window is turned into the minimum value; therefore, unnecessary collision is avoided. When collision occurs in the channel, the value of the contention window is doubled until the maximum value is achieved; then the value of a backoff counter is determined according to the contention window, and the collision of the network data is thereby controlled. The utility model is based on the present IEEE802.11 standard protocol, and no other hardware requirement is needed; the utility model is in complete distribution mode; the throughput, the time delay and other functions of the utility model are all superior to the prior backoff methods.

After malfunction happens on optic fiber, two nodes of two ends of defective optic fiber enter into bypass mode. Meanwhile, the said nodes send broadcast packets to other nodes through outer ring and inner ring to inform other nodes where failure occurs. With broadcast packet containing defective information being received, other nodes on ring net reselect direction for sending data stream based on failure location on ring net. The invention combines advantages of bypass rearrangement mode and guiding rearrangement mode so as to assure fast automatic capacity for rearrangement, save network bandwidth and low rate of losing packet.

Through real time statistics of average time delay and average dithering, the method reflects state of current network correctly. The method adjusts JB depth in real time based on state of average time delay and average dithering in everchanging network. Thus, anti dithering mechanism of reception gateway is able to adapt variable IP network dynamically, and reduces rate of packet loss in procedure of transferring voice through network. Comparing with technical scheme of static JB, and proved through tested result, the invention provides better anti dithering effect in procedure of transferring voice, raises voice quality of VOIP under relative poor condition of network quality.

The invention discloses a heterogeneous network pre-switching method based on mobile prediction, belonging to the technical field of mobile communication. The invention discloses the heterogeneous network pre-switching method based on mobile prediction, which is characterized by determining the coordinates of a mobile terminal at the network switch time through predicating the speed of the mobile terminal, and calculating the pre-switching threshold value, thus the threshold value calculation mode is improved. The heterogeneous network pre-switching method based on mobile prediction provided by the invention has the beneficial effects that the mobile distance of the terminal is predicated through a mobile predication algorithm in the pre-switching process, the pre-switching threshold value is calculated more accurately, thus the packet loss rate of the terminal in the switching process is reduced, and the resource utilization ratio of the current network is improved.