CN105357039A - Simulation method and device for delay tolerant network - Google Patents
Simulation method and device for delay tolerant network Download PDFInfo
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- CN105357039A CN105357039A CN201510706344.9A CN201510706344A CN105357039A CN 105357039 A CN105357039 A CN 105357039A CN 201510706344 A CN201510706344 A CN 201510706344A CN 105357039 A CN105357039 A CN 105357039A
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Abstract
The invention discloses a simulation method and device for a delay tolerant network, belonging to the technical field of computers. The method comprises the following steps: loading an STK simulation scene, wherein a virtual link is arranged between virtual network equipment in the STK simulation scene; and the STK simulation scene is used for simulating the change process of a connection state of a link between network equipment by adopting the virtual link after being started; configuring operation parameters of a plurality of virtual machines, wherein the plurality of virtual machines are used for simulating the communication process of the network equipment in a DTN network scene in need of being simulated; starting the STK simulation scene, and controlling the plurality of virtual machines to communicate according to the configured operation parameters; controlling on/off of the link between the virtual machines according to the on/off state of the virtual link in the communication process of the plurality of virtual machines; each virtual machine corresponding to one virtual network equipment, wherein virtual network equipment corresponding to different virtual machines can be different; obtaining operation information of each virtual machine by taking a predetermined time as the interval; and analyzing the obtained operation information, and displaying an analysis result.
Description
Technical field
The present invention relates to field of computer technology, particularly a kind of emulation mode of time delay tolerant network and device.
Background technology
Internet is (English: Internet) on the communication equipment in the interconnection whole world, to obtain huge success, it adopts transmission control protocol (TransmissionControlProtocol, be called for short TCP)/Internet Protocol (InternetProtocol, being called for short IP) protocol family as the communication protocol collection of an isomorphism, thus can shield network isomerism.Many emerging networks are there is in recent years, such as time delay tolerant network (DelayTolerantNetworks, be called for short DTN), it has network and connects the intermittent feature be communicated with, and this makes DTN can not adopt TCP/IP route data and guarantees the reliability of information exchange.Therefore, need study DTN, to determine its communication protocol be suitable for.
At present, major part, for the research of DTN, mainly concentrates on ground DTN (such as sensor network) and deep space DTN (such as deep space satellite network).For deep space DTN, the feature of its existing landing ground DTN, the periodicity having again Aerospace Satellite network Satellite node to run, node Storage and Processing resource-constrained and more precious, the feature such as uplink downlink speed is asymmetric, therefore, when studying deep space DTN, need to consider all these features.
The communication protocol that existing deep space DTN relates to comprise based on priori Unicast Routing Algorithm, meet namely access (MeetingsandVisits, being called for short MV) routing algorithm, MaxProp routing algorithm, to infect route (English: EpidemicRouting) algorithm and connection layout route (ContactGraphRouting is called for short CGR) agreement.Based on the Unicast Routing Algorithm of priori, proposed by people such as Jain the earliest, and the unicast routing protocol different according to different priori level design.The message transmitted in define grid is four-tuple (src, dst, time, size), represent the source of transmission of messages, destination node, message generation time, message size respectively, its available knowledge comprises the information such as link information between link connection information, node, node buffer size, node communication demand data transmission bandwidth, and final route target is for all message calculates minimum delay path.The people such as Brendan propose MV routing algorithm, and MV routing algorithm, by the contact probability between study node and the probability of node visit locality, carrys out the distribution of auxiliary route decision-making and buffer resource.Afterwards, Burgess etc. expand MV routing algorithm, MaxProp routing algorithm is proposed, this algorithm sorts to message according to message priority based on path histories information, and then forwarding messages, in network, delete overdue message by the mode of the acknowledge character that floods (Acknowledgement is called for short ACK) simultaneously.In addition, the people such as Vahat propose to infect routing algorithm, and in this algorithm, each node does not carry out routing decision, and floods message to all neighbor nodes.Have researcher according to spatial network interior joint laws of motion, propose CGR agreement, this agreement makes full use of the spatial network interior joint characteristics of motion, selects an optimum neighbor node, gone out by data retransmission according to the contact relation between node.
Visible, DTN and the application in deep space satellite network thereof are still in conceptual phase.In research process, often need to verify its communication protocol be suitable at real network environment, but the deep space satellite network will setting up test is very difficult.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of emulation mode and device of time delay tolerant network.Described technical scheme is as follows:
On the one hand, provide a kind of emulation mode of time delay tolerant network, described method comprises:
Inhabited satellite kit STK simulating scenes; Described STK simulating scenes creates according to the network scenarios of the time delay tolerant network DTN that need simulate, and described STK simulating scenes comprises some virtual network devices, is provided with virtual link between described virtual network device; Described STK simulating scenes is used for, and adopts described virtual link to simulate the change procedure of the connected state of the link between the described network equipment upon actuation;
Configure the operational factor of some virtual machines; Described some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the described DTN that need simulate;
Start described STK simulating scenes and control the operational factor communication of described some virtual machines according to configuration;
In the communication process of described some virtual machines, according to the on off operating mode of described virtual link, control the break-make of the link between described virtual machine; The corresponding described virtual network device of each described virtual machine, the virtual network device that different described virtual machine is corresponding is different, and the link between described virtual machine is corresponding with described virtual link;
Be interval with the scheduled time, obtain the operation information of each described virtual machine;
Analyze the operation information display analysis result that obtain.
Optionally, according to the on off operating mode of described virtual link, control the break-make of the link between described virtual machine, comprising:
Obtain the visibility information of the virtual network device in described STK simulating scenes; Described visibility information is used to indicate the make-and-break time of the virtual link between described virtual network device;
Resolve the visibility information obtained, and control the break-make of the link between described virtual machine according to analysis result.
Optionally, the operational factor of the some virtual machines of described configuration, comprising:
Obtain configuration file; Described configuration file generates according to the STK simulating scenes created, described configuration file comprises the operational factor of described some virtual machines, and described operational factor comprises the link parameter of the link between routed path between the mark of described virtual machine, the communication service of described virtual machine, described virtual machine and described virtual machine;
According to configuration file, configure the operational factor of described some virtual machines.
Optionally, described method also comprises:
In the communication process of described some virtual machines, control at least one routed path in the routed path between the described virtual machine of change.
Optionally, the operational factor communication of described some virtual machines according to configuration is controlled, at least one step in comprising the steps:
Control virtual machine described at least one and send picture to other virtual machines;
Control the picture that virtual machine described at least one receives the transmission of other virtual machines;
Control virtual machine described at least one and send video to other virtual machines of finger;
Control the video that virtual machine described at least one receives the transmission of other virtual machines.
On the other hand, provide a kind of simulator of time delay tolerant network, described device comprises:
Load-on module, for inhabited satellite kit STK simulating scenes; Described STK simulating scenes creates according to the network scenarios of the time delay tolerant network DTN that need simulate, and described STK simulating scenes comprises some virtual network devices, is provided with virtual link between described virtual network device; Described STK simulating scenes is used for, and adopts described virtual link to simulate the change procedure of the connected state of the link between the described network equipment upon actuation;
Configuration module, for configuring the operational factor of some virtual machines; Described some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the described DTN that need simulate;
First control module, for starting described STK simulating scenes and controlling the operational factor communication of described some virtual machines according to configuration;
Second control module, in the communication process of described some virtual machines, according to the on off operating mode of described virtual link, controls the break-make of the link between described virtual machine; The corresponding described virtual network device of each described virtual machine, the virtual network device that different described virtual machine is corresponding is different, and the link between described virtual machine is corresponding with described virtual link;
Acquisition module, for being interval with the scheduled time, obtains the operation information of each described virtual machine;
Display module, for analyzing the operation information of acquisition and display analysis result.
Optionally, described second control module is used for,
Obtain the visibility information of the virtual network device in described STK simulating scenes; Described visibility information is used to indicate the make-and-break time of the virtual link between described virtual network device;
Resolve the visibility information obtained, and control the break-make of the link between described virtual machine according to analysis result.
Optionally, described configuration module is used for,
Obtain configuration file; Described configuration file generates according to the STK simulating scenes created, described configuration file comprises the operational factor of described some virtual machines, and described operational factor comprises the link parameter of the link between routed path between the mark of described virtual machine, the communication service of described virtual machine, described virtual machine and described virtual machine;
According to described configuration file, configure the operational factor of described some virtual machines.
Optionally, described second control module also for,
In the communication process of described some virtual machines, control at least one routed path in the routed path between the described virtual machine of change.
Optionally, described first control module is for performing at least one step in following steps:
Control virtual machine described at least one and send picture to other virtual machines;
Control the picture that virtual machine described at least one receives the transmission of other virtual machines;
Control virtual machine described at least one and send video to other virtual machines of finger;
Control the video that virtual machine described at least one receives the transmission of other virtual machines.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By being loaded into STK simulating scenes; STK simulating scenes creates according to the network scenarios of the DTN that need simulate, STK simulating scenes comprises some virtual network devices, virtual link is provided with between virtual network device, STK simulating scenes is used for, and adopts described virtual link to simulate the change procedure of the connected state of the link between the described network equipment upon actuation; Configure the operational factor of some virtual machines; Described some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate; Start STK simulating scenes and control the operational factor communication of some virtual machines according to configuration; The corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link; In the communication process of some virtual machines, according to the on off operating mode of virtual link, control the break-make of the link between virtual machine; Be interval with the scheduled time, obtain the operation information of each virtual machine; Analyze the operation information display analysis result that obtain; On the one hand, the change procedure of the connected state of the link between the STK simulating scenes dynamic demonstration network equipment, on the other hand, the process of the connected state of the link that virtual machine is demonstrated according to STK simulating scenes, communication process between the synchronously simulating network equipment, can also according to the operation information display analysis result of virtual machine, like this, construct a kind of emulation mode of time delay tolerant network, achieve the checking of time delay tolerant network, demonstration and analysis, the research for time delay tolerant network provides the verification mode being easy to realize.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the emulation mode of a kind of time delay tolerant network that first embodiment of the invention provides;
Fig. 2 is the flow chart of the emulation mode of a kind of time delay tolerant network that second embodiment of the invention provides;
Fig. 3 is the structural representation of the simulator of a kind of time delay tolerant network that third embodiment of the invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
In embodiments of the present invention, the virtual network device in satellite kit (SatelliteToolKit is called for short STK) simulating scenes and virtual machine are all for the network equipment in analog D TN.Wherein, virtual machine is used for the communication process of analog network equipment, and virtual network device is that the figure of the network equipment is shown.Virtual link between virtual network device can the change procedure of on off operating mode of link between the dynamic demonstration network equipment.Virtual machine is corresponding with virtual network device to be arranged, and during virtual link generation break-make between virtual network device, the communication link between virtual machine also break-make occurs simultaneously.
The emulation mode of a kind of time delay tolerant network that Fig. 1 provides for first embodiment of the invention, as shown in Figure 1, the method comprises the steps.
Step S101: be loaded into STK simulating scenes.
Wherein, STK simulating scenes creates according to the network scenarios of the DTN that need simulate.STK simulating scenes comprises some virtual network devices, and virtual network device, for demonstrating the network equipment in the network scenarios of the DTN that need simulate, is provided with virtual link between virtual network device, and the link between virtual link with the network equipment is corresponding.STK simulating scenes is used for, and the virtual link upon actuation between employing virtual network device simulates the change procedure of the connected state of the link between the network equipment in the network scenarios of the DTN that need simulate.
Step S102: the operational factor configuring some virtual machines.
Wherein, some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate.For this reason, DTN protocol stack is run between virtual machine.
In the present embodiment, DTN can be ground DTN, also can be deep space DTN.DTN agreement can comprise Unicast Routing Algorithm, MV routing algorithm, MaxProp routing algorithm, at least one infected in routing algorithm and connection layout Routing Protocol based on priori.
Optionally, step S102 comprises: first, obtains configuration file.Wherein, configuration file generates according to the STK simulating scenes created.This configuration file comprises the operational factor of some virtual machines, and this operational factor comprises the link parameter of the link between routed path between the mark of this virtual machine, the communication service of this virtual machine, this virtual machine and this virtual machine.Secondly, according to configuration file, the operational factor of some virtual machines is configured.
Step S103: start STK simulating scenes and control the operational factor communication of some virtual machines according to configuration.
Optionally, control some virtual machines can comprise as at least one under type according to the mode of the operational factor communication of configuration: control at least one virtual machine and send picture to other virtual machines; Control the picture that at least one virtual machine receives the transmission of other virtual machines; Control at least one virtual machine and send video to other virtual machines of finger; Control the video that at least one virtual machine receives the transmission of other virtual machines.
Optionally, control at least one virtual machine and send picture with the first rule to other virtual machines.First rule comprises, and virtual machine first reads picture from designated store path; Be the fritter of specifying size again by the picture segmentation of reading, and record the position coordinates of fritter in picture in its entirety, obtain coordinate information file; Then fritter and coordinate information file is sent to designated virtual machine.
Optionally, at least one virtual machine receives the transmission of other virtual machines picture with Second Rule is controlled.Second Rule comprises, and virtual machine first receives fritter and coordinate information file; Again according to coordinate information file, the fritter of reception is reverted to picture in its entirety.
Step S104: in the communication process of some virtual machines, according to the on off operating mode of virtual link, controls the break-make of the link between virtual machine.
Wherein, the corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link.
Optionally, step S104 comprises: first, obtains the visibility information of the virtual network device in STK simulating scenes; This visibility information is used to indicate the make-and-break time of the virtual link between virtual network device.Secondly, resolve the visibility information obtained, and control the break-make of the link between virtual machine according to analysis result.
Optionally, this step S104 also comprises: in the communication process of some virtual machines, controls at least one routed path in the routed path between change virtual machine.
Step S105: take the scheduled time as interval, obtains the operation information of each virtual machine; Analyze the operation information display analysis result that obtain.
Wherein, operation information comprises the mark of each virtual machine and records the list of the on off operating mode change procedure between virtual machine.This list can record the moment that break-make occurs.
Wherein, the mode analyzing the operation information obtained comprises, and according to the operation information obtained and preset algorithm, calculates the singal reporting code of the DTN of some virtual machines simulation, and the singal reporting code that display calculates.
The embodiment of the present invention is by being loaded into STK simulating scenes; STK simulating scenes creates according to the network scenarios of the DTN that need simulate, STK simulating scenes comprises some virtual network devices, virtual link is provided with between virtual network device, STK simulating scenes is used for, and adopts this virtual link to simulate the change procedure of the connected state of the link between this network equipment upon actuation; Configure the operational factor of some virtual machines; This some virtual machine is for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate; Start STK simulating scenes and control the operational factor communication of some virtual machines according to configuration; The corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link; In the communication process of some virtual machines, according to the on off operating mode of virtual link, control the break-make of the link between virtual machine; Be interval with the scheduled time, obtain the operation information of each virtual machine; Analyze the operation information display analysis result that obtain; On the one hand, the change procedure of the connected state of the link between the STK simulating scenes dynamic demonstration network equipment, on the other hand, the process of the connected state of the link that virtual machine is demonstrated according to STK simulating scenes, communication process between the synchronously simulating network equipment, can also according to the operation information display analysis result of virtual machine, like this, construct a kind of emulation mode of time delay tolerant network, achieve the checking of time delay tolerant network, demonstration and analysis, the research for time delay tolerant network provides the verification mode being easy to realize.
The emulation mode of a kind of time delay tolerant network that Fig. 2 provides for second embodiment of the invention.In the present embodiment, will be described in detail the first embodiment.As shown in Figure 2, the method comprises the steps.
Step S201: according to the network scenarios of the DTN that need simulate, creates STK simulating scenes, and according to the STK simulating scenes created, generating configuration file.
Wherein, STK simulating scenes comprises some virtual network devices, virtual network device is for demonstrating the network equipment in the network scenarios of the DTN that need simulate, be provided with virtual link between virtual network device, and link between virtual link with the network equipment in the network scenarios of the DTN that need simulate is corresponding.
Wherein, this configuration file comprises the operational factor of some virtual machines, and this operational factor comprises the link parameter of the link between routed path between the mark of this virtual machine, the communication service of this virtual machine, this virtual machine and this virtual machine.Wherein, the communication service of virtual machine comprises transmission picture, sends video, receives picture and receiver, video.The link parameter of the link between virtual machine comprises bandwidth, transmission delay and packet loss etc.
Configuration file can obtain according to STK scene.Particularly, first, the mapping relations between the network equipment in the virtual network device in STK simulating scenes and the network scenarios of DTN that need simulate are obtained.According to these mapping relations, using virtual network device as virtual machine, be each virtual machine allocation identification and communication service.The mark of virtual machine and communication service are saved in configuration file.Secondly, analyze each virtual network device in STK simulating scenes, the observability obtaining each virtual network device is (English: Access) information.Visibility information is used to indicate the make-and-break time of the virtual link between virtual network device.According to this visibility information, the routed path between each virtual machine is set and the link parameter of the link between virtual machine is set.Routed path between each virtual machine and the link parameter of link that arranges between virtual machine are saved in configuration file.When realizing, configuration file can be extend markup language (ExtensibleMarkupLanguage is called for short XML) file.
Such as, suppose that a network scenarios of the DTN that need simulate comprises the communication process of low orbit satellite and ground station.Particularly, the data of low orbit satellite collection need to be sent to ground station.Because low orbit satellite and ground station exist the situation of invisible (cannot direct communication), when low orbit satellite and ground station invisible time, both cannot communicate, and interrupting appears in link.So when both are invisible, low orbit satellite by the relaying of geostationary satellite, can send the data to ground station.In this scene, the network equipment comprises low orbit satellite, geostationary satellite and ground station.Routed path between the network equipment and link comprise routed path from low orbit satellite to ground station and link, also have the routed path from low orbit satellite to geostationary satellite and link.Based on this, in the STK simulating scenes of generation, have 3 virtual network devices, these 3 virtual network devices are corresponding with low orbit satellite, geostationary satellite and ground station respectively.In the same manner, configuration file comprises the mark and communication service etc. of 3 virtual machines.
Step S202: be loaded into the STK simulating scenes created.
When preparing to emulate the network scenarios of the DTN that need simulate, be loaded into the STK simulating scenes be pre-created.
Step S203: obtain configuration file, and according to configuration file, configure the operational factor of each virtual machine in some virtual machines.
Wherein, some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate.Run DTN protocol stack between virtual machine, the operational factor of virtual machine is according to configuration file configuration, and configuration file generates according to the network scenarios of the DTN that need simulate, and like this, virtual machine can analog D TN communication really.
In the present embodiment, virtual machine is based upon in main frame.When the operational factor of configuring virtual machine, by main frame, operational factor can be passed to virtual machine.Particularly, virtual machine can carry out TCP communication by Microsoft Loopback Adapter and main frame.Http communication mode operational factor can be passed to main frame, operational factor is passed to virtual machine in http communication mode by main frame again.
Particularly, the hardware resource of virtual machine is generated by mainframe virtualization, and Intel Virtualization Technology can adopt the combination of software of kvm+qemu.Some (such as 4) virtual machine can be set up in a main frame.Main frame can run Ubuntu14.04 system, and the virtual machine on main frame can run Ubuntu12.04 system.Main frame may be used for managing virtual machines, comprises the operations such as establishment, Resources allocation, startup and stopping.Virtual machine runs DTN protocol stack and communications applications, DTN communication that is virtually reality like reality.
Step S204: the mapping relations setting up virtual network device and virtual machine.
Wherein, the corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with the virtual link between virtual network device.
Step S205: start STK simulating scenes, and control the operational factor communication of some virtual machines according to configuration.
Wherein, STK simulating scenes is used for, the change procedure of the connected state of the link between the network equipment adopting virtual link to simulate in the network scenarios of the DTN that need simulate upon actuation.
Particularly, STK simulating scenes upon actuation, by the change procedure of the on off operating mode of the virtual link between dynamic play virtual network device.
Optionally, control some virtual machines can comprise as at least one under type according to the mode of the operational factor communication of configuration: control at least one virtual machine and send picture to other virtual machines; Control the picture that at least one virtual machine receives the transmission of other virtual machines; Control at least one virtual machine and send video to other virtual machines of finger; Control the video that at least one virtual machine receives the transmission of other virtual machines.
Particularly, each virtual machine is provided with at least one business module in advance, such as picture sending module, picture receiver module, video sending module or video reception module.When controlling virtual machine communication, can send service order to virtual machine, service order is used to indicate virtual machine activation specified services, and service order can comprise the mark of business and the mark of the associated virtual machine corresponding with the mark of business.When virtual machine receives service order, specified services can be opened.When realizing, service order can be arranged in operational factor.Like this, when the operational factor of configuring virtual machine, in the lump service order can be sent to virtual machine.
Optionally, control at least one virtual machine and send picture to other virtual machines, comprise, control at least one virtual machine and send picture with the first rule to other virtual machines.First rule comprises, and reads picture from designated store path; Be the fritter of specifying size by the picture segmentation of reading, and record the position coordinates of fritter in picture in its entirety, obtain coordinate information file; Fritter and coordinate information file is sent to designated virtual machine.
Particularly, virtual machine sends picture according to the first rule to other virtual machines, and comprise, A, virtual machine reading images file, this file path is specified by service order; B, virtual machine are by image file by being divided into the much more total fritter of quantity, and each small images size is specified by start-up parameter, and its coordinate figure residing for view picture figure is saved as txt file (coordinate information); Small images is formatted as png form by C, virtual machine, combines its coordinate information file, is packaged as zip form; Zip bag is encapsulated as bundle bag by D, virtual machine, and carries out routing forwarding, to transfer to object virtual machine.
Optionally, control the picture that at least one virtual machine receives the transmission of other virtual machines, comprise, control at least one virtual machine receives the transmission of other virtual machines picture with Second Rule.Second Rule comprises, and receives fritter and coordinate information file; According to coordinate information file, the fritter of reception is reverted to picture in its entirety.
Particularly, virtual machine receives the picture of other virtual machines transmission according to Second Rule, comprises, A, virtual machine wait-receiving mode bag; The bag received is resolved with zip form by B, virtual machine, obtains the position elements information of small images file and this block; This fritter, according to the positional information of fritter, is plotted in the assigned address of drawing area by C, virtual machine, until draw complete.
Particularly, the mode that virtual machine sends video can comprise, and video (HTTP bag) is encapsulated as bundle bag by virtual machine, and by routing forwarding, to transfer to object virtual machine.
Particularly, the mode of virtual machine receiver, video can comprise, the bundle video packets deblocking that A, virtual machine will receive, and obtains HTTP video packets; HTTP video packets is transferred to the VLC broadcasting of main frame by B, virtual machine with Transmission Control Protocol.
Step S206: in the communication process of some virtual machines, according to the on off operating mode of virtual link, controls the break-make of the link between virtual machine.
According to the on off operating mode of virtual link, control the break-make of the link between virtual machine, comprise, first, obtain the Access information of virtual network device; Secondly, resolve the Access information obtained, and control the break-make of the link between virtual machine according to analysis result.
Particularly, after step S202 is loaded into STK simulating scenes, resolves the type of virtual network device, and obtain the Access information of virtual network device.When resolving virtual network device and its type, employ the STKReportStyle of self-defining GetAllObject by name, the Connect interface provided by calling STK generates the report of GetAllObject, can obtain the object (virtual network device) in STK simulating scenes and its type.After the object obtained in STK simulating scenes and its type, just can resolve the Access information of virtual network device.At this moment, use the STKReportStyle of self-defining Access by name, generated the report of Access by Connect interface, the visibility information of each virtual network device can be obtained.Such as, the visibility information of the virtual network device of demonstration ground station comprises, the period (communication link connection) of virtual network device of virtual network device visible presentations low orbit satellite of demonstration ground station and the period (communication link disconnection) of the virtual network device of invisible demonstration low orbit satellite.
After obtaining analysis result, according to analysis result link generation event.Single link event be embodied as AccessInfo class, store 4 fields: Time, FromObj, ToObj, LinkOp, represent time of origin, the source node of link, the destination node of link, link operation (disconnect or be communicated with) respectively.
The triggering of link event is determined by the simulation time of STK simulating scenes.The time value of whole emulation is the internal time in STKX control, emulates the start-up time that the time started is STK simulating scenes.Can maintain a timer Timer, its tick is spaced apart 100ms, often crosses a tick and checks simulation time, and according to simulation time trigger link event.
Optionally, the mode controlling the break-make of the link between virtual machine can comprise: send the first control command to virtual machine, the link that the first control command is used to indicate between virtual machine with other virtual machines disconnects or is communicated with.
Particularly, all link event can being stored sequentially in event queue according to time of origin.When the Tick function of each Timer triggers, according to the time (i.e. the Time information of AccessInfo class) in simulation time and link event, event whether is had to go out team in decision event queue, SDN (software defined network) FlowTable stream table (the first control command) is generated according to going out group event, and be handed down to virtual machine, thus control the break-make of the link between virtual machine.In stream table, the up event of link represents the connection of Flow, and at this moment the link of corresponding simulation node can be communicated with, and contrary down event represents the disconnection of Flow, at this moment the link of corresponding simulation node can disconnect, and the source and destination IP of Flow is then according to FromObj and ToObj.
Step S207: in the communication process of some virtual machines, controls at least one routed path in the routed path between change virtual machine.
Optionally, the mode controlling the routed path between change virtual machine can comprise: send the second control command to virtual machine, the routed path that the second control command is used to indicate between virtual machine and other virtual machines changes.
Owing to there is the situation that routed path changes in some scene, therefore need the routed path between corresponding change virtual machine.Can after step S202 be loaded into STK simulating scenes, the routed path comprised according to configuration file and the visibility information of virtual network device, set up routing change event in advance, and routing change event be also stored in event queue according to time of origin.
Each routing change event comprises 5 fields: eventTime, eventType, routeNode, desteid, nexthop, represent respectively event time, route increase or deletion action, Operational node, destination, down hop.With link event administrative class seemingly, Timer tick trigger after, detect the routing change event of team, according to eventType judge increase or delete routed path, change routed path after, still utilize link event link management break-make.
It should be noted that, step S206 and step S207 all performs in the communication process of dry virtual machine, and the order of step S206 and step S207 is regardless of front and back.
Step S208: take the scheduled time as interval, obtains the operation information of each virtual machine; Analyze the operation information display analysis result that obtain.
Wherein, operation information comprises the mark of each virtual machine and records the list of the on off operating mode change procedure between virtual machine.This list can record the moment that break-make occurs.
Wherein, the mode analyzing the operation information obtained comprises, according to the operation information obtained and preset algorithm, and the singal reporting code of the DTN of calculating simulation; The singal reporting code that display calculates.
Stat commands can be sent, to obtain statistical information to virtual machine.Stat commands can be telnet protocol command.
Wherein, singal reporting code comprises and on average successfully pays probability, message transmissions ratio, packet loss ratio, network average retardation, network overhead ratio, delivery of packets rate, queue length.In realization, all indexs are all inherited from abstract class Metric, and each index must carry out override realization to UpdateData function in realization, to realize the index calculate of self.
The mode of chart can show the singal reporting code of calculating.
The embodiment of the present invention is by being loaded into STK simulating scenes; STK simulating scenes creates according to the network scenarios of the DTN that need simulate, STK simulating scenes comprises some virtual network devices, virtual link is provided with between virtual network device, STK simulating scenes is used for, and adopts this virtual link to simulate the change procedure of the connected state of the link between this network equipment upon actuation; Configure the operational factor of some virtual machines; This some virtual machine is for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate; Start STK simulating scenes and control the operational factor communication of some virtual machines according to configuration; The corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link; In the communication process of some virtual machines, according to the on off operating mode of virtual link, control the break-make of the link between virtual machine; Be interval with the scheduled time, obtain the operation information of each virtual machine; Analyze the operation information display analysis result that obtain; On the one hand, the change procedure of the connected state of the link between the STK simulating scenes dynamic demonstration network equipment, on the other hand, the process of the connected state of the link that virtual machine is demonstrated according to STK simulating scenes, communication process between the synchronously simulating network equipment, can also according to the operation information display analysis result of virtual machine, like this, construct a kind of emulation mode of time delay tolerant network, achieve the checking of time delay tolerant network, demonstration and analysis, the research for time delay tolerant network provides the verification mode being easy to realize.
The simulator of a kind of time delay tolerant network that Fig. 3 provides for third embodiment of the invention, this simulator goes for the method that the first embodiment or the second embodiment provide.As shown in Figure 3, this device comprises load-on module 301, configuration module 302, first control module 303, second control module 304, acquisition module 305 and display module 306.
Load-on module 301, for being loaded into STK simulating scenes.STK simulating scenes creates according to the network scenarios of the DTN that need simulate, STK simulating scenes comprises some virtual network devices, virtual network device is for demonstrating the network equipment in the network scenarios of the DTN that need simulate, be provided with virtual link between virtual network device, and link between virtual link with the network equipment is corresponding.STK simulating scenes is used for, and adopts the change procedure of the connected state of the link between virtual link analog network equipment upon actuation.
Configuration module 302, for configuring the operational factor of some virtual machines.Some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate.
First control module 303, for starting STK simulating scenes and controlling the operational factor communication of some virtual machines according to configuration.
Second control module 304, in the communication process of some virtual machines, according to the on off operating mode of virtual link, controls the break-make of the link between virtual machine.The corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link.
Acquisition module 305, for being interval with the scheduled time, obtains the operation information of each virtual machine.
Display module 306, for analyzing the operation information of acquisition and display analysis result.
As the first Alternate embodiments, the second control module 304 for, obtain the visibility information of the virtual network device in STK simulating scenes; This visibility information is used to indicate the make-and-break time of the virtual link between virtual network device; Resolve the visibility information obtained, and control the break-make of the link between virtual machine according to analysis result.
As the second Alternate embodiments, configuration module 302 for, obtain configuration file, this configuration file generates according to the STK simulating scenes created, this configuration file comprises the operational factor of some virtual machines, and this operational factor comprises the link parameter of the link between routed path between the mark of virtual machine, the communication service of virtual machine, virtual machine and virtual machine; According to configuration file, configure the operational factor of some virtual machines.
As the 3rd Alternate embodiments, the second control module 304 also for, in the communication process of some virtual machines, control change virtual machine between routed path at least one routed path.
As the 4th Alternate embodiments, the first control module 303 is for performing at least one step in following steps: control at least one virtual machine and send picture to other virtual machines; Control the picture that at least one virtual machine receives the transmission of other virtual machines; Control at least one virtual machine and send video to other virtual machines of finger; Control the video that at least one virtual machine receives the transmission of other virtual machines.
The embodiment of the present invention is by being loaded into STK simulating scenes; STK simulating scenes creates according to the network scenarios of the DTN that need simulate, STK simulating scenes comprises some virtual network devices, virtual link is provided with between virtual network device, STK simulating scenes is used for, and adopts this virtual link to simulate the change procedure of the connected state of the link between this network equipment upon actuation; Configure the operational factor of some virtual machines; This some virtual machine is for simulating the communication process of the network equipment in the network scenarios of the DTN that need simulate; Start STK simulating scenes and control the operational factor communication of some virtual machines according to configuration; The corresponding virtual network device of each virtual machine, the virtual network device that different virtual machine is corresponding is different, and the link between virtual machine is corresponding with virtual link; In the communication process of some virtual machines, according to the on off operating mode of virtual link, control the break-make of the link between virtual machine; Be interval with the scheduled time, obtain the operation information of each virtual machine; Analyze the operation information display analysis result that obtain; On the one hand, the change procedure of the connected state of the link between the STK simulating scenes dynamic demonstration network equipment, on the other hand, the process of the connected state of the link that virtual machine is demonstrated according to STK simulating scenes, communication process between the synchronously simulating network equipment, can also according to the operation information display analysis result of virtual machine, like this, construct a kind of emulation mode of time delay tolerant network, achieve the checking of time delay tolerant network, demonstration and analysis, the research for time delay tolerant network provides the verification mode being easy to realize.
It should be noted that: the simulator of the time delay tolerant network that above-described embodiment provides is when emulating, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by equipment is divided into different functional modules, to complete all or part of function described above.In addition, the simulator of the time delay tolerant network that above-described embodiment provides and the emulation mode embodiment of time delay tolerant network belong to same design, and its specific implementation process refers to embodiment of the method, repeats no more here.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an emulation mode for time delay tolerant network, is characterized in that, described method comprises:
Inhabited satellite kit STK simulating scenes; Described STK simulating scenes creates according to the network scenarios of the time delay tolerant network DTN that need simulate, and described STK simulating scenes comprises some virtual network devices, is provided with virtual link between described virtual network device; Described STK simulating scenes is used for, and adopts described virtual link to simulate the change procedure of the connected state of the link between the described network equipment upon actuation;
Configure the operational factor of some virtual machines; Described some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the described DTN that need simulate;
Start described STK simulating scenes and control the operational factor communication of described some virtual machines according to configuration;
In the communication process of described some virtual machines, according to the on off operating mode of described virtual link, control the break-make of the link between described virtual machine; The corresponding described virtual network device of each described virtual machine, the virtual network device that different described virtual machine is corresponding is different, and the link between described virtual machine is corresponding with described virtual link;
Be interval with the scheduled time, obtain the operation information of each described virtual machine;
Analyze the operation information display analysis result that obtain.
2. method according to claim 1, is characterized in that, according to the on off operating mode of described virtual link, controls the break-make of the link between described virtual machine, comprising:
Obtain the visibility information of the virtual network device in described STK simulating scenes; Described visibility information is used to indicate the make-and-break time of the virtual link between described virtual network device;
Resolve the visibility information obtained, and control the break-make of the link between described virtual machine according to analysis result.
3. method according to claim 1, is characterized in that, the operational factor of the some virtual machines of described configuration, comprising:
Obtain configuration file; Described configuration file generates according to the STK simulating scenes created, described configuration file comprises the operational factor of described some virtual machines, and described operational factor comprises the link parameter of the link between routed path between the mark of described virtual machine, the communication service of described virtual machine, described virtual machine and described virtual machine;
According to described configuration file, configure the operational factor of described some virtual machines.
4. method according to claim 1, is characterized in that, described method also comprises:
In the communication process of described some virtual machines, control at least one routed path in the routed path between the described virtual machine of change.
5. method according to any one of claim 1 to 4, is characterized in that, controls the operational factor communication of described some virtual machines according to configuration, at least one step in comprising the steps:
Control virtual machine described at least one and send picture to other virtual machines;
Control the picture that virtual machine described at least one receives the transmission of other virtual machines;
Control virtual machine described at least one and send video to other virtual machines of finger;
Control the video that virtual machine described at least one receives the transmission of other virtual machines.
6. a simulator for time delay tolerant network, is characterized in that, described device comprises:
Load-on module, for inhabited satellite kit STK simulating scenes; Described STK simulating scenes creates according to the network scenarios of the time delay tolerant network DTN that need simulate, and described STK simulating scenes comprises some virtual network devices, is provided with virtual link between described virtual network device; Described STK simulating scenes is used for, and adopts described virtual link to simulate the change procedure of the connected state of the link between the described network equipment upon actuation;
Configuration module, for configuring the operational factor of some virtual machines; Described some virtual machines are for simulating the communication process of the network equipment in the network scenarios of the described DTN that need simulate;
First control module, for starting described STK simulating scenes and controlling the operational factor communication of described some virtual machines according to configuration;
Second control module, in the communication process of described some virtual machines, according to the on off operating mode of described virtual link, controls the break-make of the link between described virtual machine; The corresponding described virtual network device of each described virtual machine, the virtual network device that different described virtual machine is corresponding is different, and the link between described virtual machine is corresponding with described virtual link;
Acquisition module, for being interval with the scheduled time, obtains the operation information of each described virtual machine;
Display module, for analyzing the operation information of acquisition and display analysis result.
7. device according to claim 6, is characterized in that, described second control module is used for,
Obtain the visibility information of the virtual network device in described STK simulating scenes; Described visibility information is used to indicate the make-and-break time of the virtual link between described virtual network device;
Resolve the visibility information obtained, and control the break-make of the link between described virtual machine according to analysis result.
8. device according to claim 6, is characterized in that, described configuration module is used for,
Obtain configuration file; Described configuration file generates according to the STK simulating scenes created, described configuration file comprises the operational factor of described some virtual machines, and described operational factor comprises the link parameter of the link between routed path between the mark of described virtual machine, the communication service of described virtual machine, described virtual machine and described virtual machine;
According to described configuration file, configure the operational factor of described some virtual machines.
9. device according to claim 6, is characterized in that, described second control module also for,
In the communication process of described some virtual machines, control at least one routed path in the routed path between the described virtual machine of change.
10. the device according to any one of claim 6 to 9, is characterized in that, described first control module is for performing at least one step in following steps:
Control virtual machine described at least one and send picture to other virtual machines;
Control the picture that virtual machine described at least one receives the transmission of other virtual machines;
Control virtual machine described at least one and send video to other virtual machines of finger;
Control the video that virtual machine described at least one receives the transmission of other virtual machines.
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