CN101511109A - Method for ensuring satellite network service quality based on mobile agent - Google Patents
Method for ensuring satellite network service quality based on mobile agent Download PDFInfo
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Abstract
The invention provides a method for ensuring satellite network service quality based on a mobile agent which is used for solving service quality ensuring problem of various QoS operation in the satellite network transmitting from end to end. The method makes the satellite network no needing special resource reservation signaling agreement, but distributing a bandwidth resource needed by QoS route through the agreement of the mobile agent, reacts to linkage switch, linkage invalidation or node invalidation allodially and dynamically by using changes of the mobile agent monitor satellite network, keeping accuracy of the resource reservation information, and satisfying more QoS requirements by using the mobile agent for realizing agreement of the resource reservation. The method can process network resource reservation according with operation QoS requirement before sending the data, provide QoS ensuring from end to end and process cooperation with the resource reservation.
Description
Technical field
The present invention is a kind of method for ensuring satellite network service quality based on mobile agent.Be mainly used in and solve various QoS (Quality of Service, service quality) business problem of service quality assurance end to end in the satellite network transmission, belong to the satellite network communication technical field.
Background technology
Professional and the ambulant demand along with ever-increasing interactive real-time multimedia, satellite network will become the important component part of global system for mobile communications, and global seamless covering, mobility, no region are limited and provided QoS to guarantee to have become the global system for mobile communications key character.These special factors such as background noise in disposal ability and cosmic space make satellite network QoS technology be faced with special challenge on the topology of satellite network dynamic change, the limited star.
Intelligent agent particularly mobile agent has become a research field that has vigor and influence power at present.Mobile agent is the intelligent agent with mobility, it is the software kit that comprises code, data and carry out linguistic context, can in the process of carrying out, there be purpose, autonomous ground in network, to move, utilize the software entity of the distribution task of finishing alternately of distributed resource.Mobile proxy technology effectively conserve network bandwidth, overcome network delay, improve communication efficiency, support disconnected operation, support asynchronous autonomous mutual, dynamic adaptable network environment.Mobile proxy technology is the product that distributed computing technology combines with agent skill group, has independence, reactivity, target goal, at characteristics such as environment and mobility, and its appearance has brought huge innovation for Distributed Calculation and mobile computing.
In order to solve the QoS problem, IETF (Internet Engineer Task Force, the Internet engineering duty group) has proposed the model of integrated service.The basic thought of integrated service is before transmitting data, carries out network resource reservation based on moving speed according to the QoS demand of business, thereby QoS guarantees for this data flow provides end to end.RSVP (Resource ReSer Vation Protocol, RSVP) is the core of integrated service, is a kind of signaling protocol, is used for informing network node reserved resource.Resource reservation is used to realize to the comparatively transmission of hard real time business of qos requirement." soft " state of setting up and safeguard flow control and RSVP in router and main frame has been adopted in the design of RSVP, promptly come state on the Maintenance Point by periodically sending refresh message, do not receive refresh message if surpass the regular hour, then corresponding state is deleted.RSVP is widely used in ground network, but the dynamic change of satellite network topology causes frequent switching, the link-state information real-time change, exist high bit-error in the satellite link, time delay is excessive, the asymmetric problem of bandwidth, more than these characteristics, make and to transmit the RSVP that realizes resource reservation with signaling, can't be in the satellite network environment efficient application.
The dynamic change of satellite network topology, on the one hand, make RSVP increase a large amount of state-maintenance signalings, on the other hand, the refresh message mechanism of RSVP makes real link information and obligate information can not get upgrading timely, has caused waste of network resources.And satellite link high bit-error, time delay are excessive, the correct transmission of the asymmetric problems affect signaling of bandwidth, make to have a large amount of signalings in the link, have increased congested possibility.In satellite network, use RSVP to have weak point, therefore need new method for ensuring service quality to be suggested the assurance that realizes the satellite network end-to-end quality of service.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of method for ensuring satellite network service quality, solve various QoS business problem of service quality assurance end to end in the satellite network transmission based on mobile agent.The method that the application of the invention proposes can be carried out the reservation of Internet resources according to the QoS demand of business before transmitting data, QoS guarantees for this data flow provides end to end, and can hold consultation to resource reservation.
Technical scheme: method for ensuring satellite network service quality of the present invention is to be QoS path allocation corresponding bandwidth resource by the negotiation between mobile agent, utilize the independence of mobile agent simultaneously, at environment, intelligent and ambulant characteristics, the variation of monitor satellite node and link in real time, the accuracy that keeps resource obligate information, and resource reservation held consultation.
Method for ensuring satellite network service quality based on mobile agent of the present invention is the required bandwidth resources of QoS path allocation by the negotiation between the mobile agent, and its step is as follows:
Step 1: insert the QoS service request that satellite node receives the user, by the QoS mapping block business demand is converted into qos parameter, produce reservation agent, simultaneously qos parameter, local address and purpose satellite address are loaded in the reservation agent, reservation agent is a QoS path bandwidth application resource;
Step 2: when reservation agent was moved to an intermediate node, reservation agent and information agency were mutual, calculated required resource according to business characteristic and qos requirement, and caller judges whether to accept this Business Stream; If accept, will distribute corresponding bandwidth and buffering space and write down the correlation behavior message of this data flow, bandwidth resources are reserved, reservation agent is moved to the next satellite node, if refusal then sends coordination agent advertisement source satellite node startup resource reservation negotiation module to the source satellite node and destroys reservation agent simultaneously;
Step 3: if reservation agent has arrived destination node, do not switch if star ground takes place destination node, then send one and confirm that the agency notifies its resource reservation success to destroy reservation agent simultaneously to the source satellite node, if monitoring agent discovery purpose satellite does not cover the ground receiving terminal at this moment, then send to cancel to act on behalf of and discharge reserved resource, send mobile agent notification source satellite node simultaneously and carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
Step 4:, act on behalf of by monitoring and to judge whether the source satellite node star ground takes place switch if the source satellite node receives the confirmation the agency; If do not switch, accept user's QoS request, call the control information load-on module simultaneously, the data packet head that receives is expanded, preserve the control information of bandwidth resources reserved path,, cancel the agency to the transmission of purpose satellite node and discharge reserved resource if switch, carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
Step 5: if switch or link failure between monitoring agent discovery satellite generation star, and preserve the bandwidth resources reserved information in the satellite, this satellite produces cancels the agency, and portably use the reserved data stream information of this handoff links resource, to other node migrations, if the node of moving to contains with cancelling reserved data stream information identical among the agency, this data flow reserved resource is cancelled; If in migration, confirm agency or reservation agent if run into, cancelling the agency carries out alternately with them, judge whether the reserved data stream information of cancelling among the agency has comprised the traffic flow information of confirming agency or reservation agent, if comprised, send mobile agent notification source satellite node and carry out heavy-route, again producing reservation agent is QoS path bandwidth application resource, destroys confirming agency or reservation agent.
Described reservation negotiation module when reservation agent finds that the resource of certain node does not satisfy during for the required bandwidth resources of QoS path application, has started the reservation negotiation module this QoS request has been held consultation, and idiographic flow is as follows:
Step 21: if the required resource of user differs hour with the satellite node surplus resources, send to consult to act on behalf of and hold consultation with the user, whether inquiry can reduce service request, if user's permission, revise the qos parameter information of reservation agent, in this node distribution corresponding bandwidth and the correlation behavior message that cushions the space and write down this data flow, reservation agent is moved to next node, continues as QoS path bandwidth application resource simultaneously;
Step 22: if the user disagrees with the reduction service request, judge whether link circuit resource has distributed to non-QoS path or lower grade of service request QoS path, if, then discharge certain resource, satisfy new QoS request, otherwise, consult failure;
Step 23: if when the required resource of user differs big or consults failure with the satellite node surplus resources, send the satellite node refusal QoS request of refusal agent advertisement source, and send and cancel the agency and discharge reserved resource.
Beneficial effect: the inventive method has proposed a kind of method for ensuring satellite network service quality, is mainly used in the various QoS business problem of service quality assurance end to end in the satellite network transmission that solves.The method that the application of the invention proposes makes does not need special resource reservation signaling protocol on the satellite network, by the negotiation between the mobile agent is QoS path allocation corresponding bandwidth resource, Internet resources have been saved, satellite link time-delay and congested influence have been overcome to the correct transmission of reservation confirmation information, utilize the variation of mobile agent monitor satellite node and link, to link switchover, link failure or node failure are independently, dynamically make a response, the accuracy that keeps resource obligate information, utilize the characteristics of mobile agent to realize the negotiation of resource reservation simultaneously, thereby satisfy more QoS request.
Protocol-independent: various satellite network Routing Protocols can be realized the assurance of end-to-end quality of service by the inventive method, are used for the comparatively transmission of hard real time business of qos requirement.
Have dynamic adaptable: the satellite network change in topology is very fast, mobile agent and satellite network carry out alternately in the inventive method, the variation of perception satellite node and link, to link switchover, link failure or node failure independently, make a response apace, on the one hand, keep the accuracy of satellite network link-state information and resource obligate information, on the other hand, the reserved resource that lost efficacy can access timely release, has saved the bandwidth resources of satellite network.
Overcome the asymmetric problem of satellite network bandwidth: bandwidth is asymmetric on satellite link, the time-delay of reverse link and the congested correct transmission that influences reservation confirmation information.The migration that the inventive method is carried reservation confirmation information by mobile agent realizes the transmission of confirmation, the transmission of reservation confirmation information is separate with the transmission of data flow, make reservation confirmation information can be sent to the reception satellite timely, shortened the stand-by period of user QoS request.
Conserve network resources: the inventive method is not used the signaling transmission, and by realizing resource reservation between the mobile agent alternately, has reduced the expense of signaling transmission in the network, has saved Internet resources, has reduced the congested possibility of satellite network.Particularly under the situation of satellite network bandwidth deficiency, use the inventive method can effectively save offered load.
Extensibility: the inventive method is applicable to the individual layer satellite network of similar polar orbit constellation, simultaneously also can be at the multilayer satellite architecture.
Description of drawings
Fig. 1 is based on the method for ensuring satellite network service quality overall construction drawing of mobile agent.
Fig. 2 is mobile agent architectural framework figure.
Fig. 3 is based on the workflow of the resource reservation module of mobile agent.
Fig. 4 is based on the workflow of the satellite network monitoring modular of mobile agent.
Fig. 5 is based on the workflow of the reservation negotiation module of mobile agent.
Embodiment
Method for ensuring satellite network service quality based on mobile agent of the present invention is made up of the mapping of service quality, the reservation of resource, the monitoring of satellite network and negotiation four parts of resource reservation.Mapping by service quality is converted into qos parameters such as bandwidth that network layer can discern, time delay, delay variation, packet loss to user's business demand, by the resource reservation corresponding bandwidth resource that has been the QoS path allocation, the monitoring of network via satellite judges whether satellite link switches or whether satellite node and link lost efficacy, make reserved resource obtain upgrading, satisfy more QoS request by the negotiation of resource reservation.Method for ensuring service quality of the present invention is described as follows:
1) user sends the QoS request, and the mapping that receives passing of satelline service quality is converted into qos parameter to this request, and qos parameter is loaded into reservation agent;
2) send reservation agent according to the required bandwidth resources of QoS path migration application that Routing Protocol calculates, can obtain following three kinds of situations:
● the resource bid success
Send its QoS path resource bid success (reserving successfully) of affirmation agent advertisement to the source satellite node, if receiving, the source satellite node confirms not take place when acting on behalf of the switching of star ground or do not receive to cancel the resource release message of agency to reserved data stream, then accept the QoS request, otherwise be the required bandwidth resources of QoS path application again.
● the negotiation of resource reservation
If the required resource of user differs hour with the satellite node surplus resources, send and consult the agency and hold consultation with the user, inquire whether can reduce service request, if user's permission, consult successfully,, judge whether resource distributes to non-QoS path or lower grade of service request the QoS path of accepting connection if the user disagrees with the reduction service request, if have, then discharge certain resource, satisfy new QoS request, consult successfully, otherwise, consult failure.
● failures in resource application
The required resource of user follows the satellite node surplus resources to differ big, consult under failure or the interior uncompleted situation of resource reservation of request thresholding time, send the satellite node refusal QoS request of refusal agent advertisement source, and send and cancel the agency and discharge reserved resource.
3) resource reservation is consulted successful reservation agent and is continued as the required bandwidth resources of QoS path application till resource bid success or failure.
4) for the resource bid again of switching because of satellite, satellite node lost efficacy or satellite link lost efficacy and produces, if ask thresholding in the time resource bid do not finish, declare failures in resource application so.
One, architecture
Method for ensuring satellite network service quality based on mobile agent is realized by end-to-end resource reservation.The resource reservation of the inventive method is finished by the negotiation between the mobile agent, Internet resources have not only been saved, and satellite link time-delay and the congested influence that reservation confirmation information is correctly transmitted have been overcome, wherein, QoS mapping block, resource reservation module, control information load-on module, monitoring modular and reservation negotiation module are to realize the main function components of the inventive method, below just several concrete parts are provided explanation:
QoS mapping block: user's business demand is converted into qos parameters such as bandwidth, time delay, delay variation, packet loss.
Resource reservation module: in this module, realized collection, the reservation of resource and the cancelling of resource of information, by information agency, reservation agent, affirmation agency, cancel a series of mobile agents such as agency and finish.The effect of main mobile agent is as follows:
Information agency: be used for dynamic collection independently and preserve the state information of satellite link and QoS information in real time such as time delay, bandwidth, packet loss.
Reservation agent: carried the data such as qos parameter such as bandwidth, time delay, delay variation, packet loss of satellite address, source, purpose satellite address and the user's request of the packet of QoS requested service, carried out the resource reservation in QoS path.
Confirm the agency: be used for returning reservation confirmation information notice receiving terminal QoS path and reserve successfully.
Refusal agency: be used for notifying receiving terminal QoS path to reserve failure, refusing user's QoS request.
Cancel the agency: be used for the reserved resource that lost efficacy is discharged.Resource discharge to be to realize by the status message that discharges the bandwidth of distributing and buffering space and deleted data stream.
Control information load-on module: the control information extension header that is used to increase packet.The relevant control messages of data flow is loaded into packet, corresponding with the reserved data stream mode message that writes down in the satellite node, make the transmission of packet not need extra control grouping, packet can be transmitted independently, alleviates the load of network.
Monitoring modular: when reservation agent is carried out resource reservation and QoS data flow transmission, utilize monitoring to act on behalf of whether monitor satellite the satellite link switching takes place, satellite node lost efficacy or satellite link lost efficacy.Switch and the satellite link inefficacy for inter-satellite link, the satellite node of both link ends is cancelled the agency by transmission and is discharged reserved resource, lost efficacy for satellite node, the reactivity of mobile agent makes its inefficacy of perception satellite node timely, mobile agent backs up the reserved data stream information of satellite node storage, and carrying these information transfers to all neighbor nodes by cancelling the agency, the reserved resource of cancelling the agency discharges processing procedure and switches the same with the situation of satellite link inefficacy with inter-satellite link.
Reservation negotiation module: in this module, to the required resource of user with the satellite node surplus resources differ less satellite transmission mobile agent and user consult to reduce quality of service requirement or discharge some reserved resource satisfy new request, if when negotiation failure or satellite node surplus resources differed big with the required resource of user, the QoS of refusing user's asked.
Two, method flow
The inventive method is the required bandwidth resources of QoS path allocation by the negotiation between the mobile agent, and its step is as follows:
(1) inserts the QoS service request that satellite node receives the user, by the QoS mapping block business demand is converted into qos parameter, produce reservation agent, simultaneously qos parameter, local address and purpose satellite address are loaded in the reservation agent, reservation agent is the required bandwidth resources of QoS path application;
When (2) reservation agent was moved to an intermediate node, reservation agent and information agency were mutual, calculated required resource according to business characteristic and qos requirement, and caller judges whether to accept this Business Stream;
If a. accept, will distribute corresponding bandwidth and buffering space and write down the correlation behavior message of this data flow, bandwidth resources to be reserved, reservation agent is moved to the next satellite node;
If b. refusal then sends coordination agent advertisement source satellite node startup reservation negotiation module to the source satellite node and destroys reservation agent simultaneously;
(3) if reservation agent has arrived destination node, do not switch if star ground takes place destination node, then send one and confirm that the agency notifies its resource reservation success to destroy reservation agent simultaneously to the source satellite node, if monitoring agent discovery purpose satellite does not cover the ground receiving terminal at this moment, then send to cancel to act on behalf of and discharge reserved resource, send mobile agent notification source satellite node simultaneously and carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
(4), act on behalf of by monitoring and to judge whether the source satellite node star ground takes place switch if the source satellite node receives the confirmation the agency;
A. if do not switch, accept user's QoS request, call the control information load-on module simultaneously, the data packet head that receives is expanded, preserve the control information in resource reservation path;
B. if switch, cancel the agency to the transmission of purpose satellite node and discharge reserved resource, carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
(5) if switch or link failure between monitoring agent discovery satellite generation star, and preserve the information of reserved resource in the satellite, this satellite produces cancels the agency, and portably use the reserved data stream information of this handoff links resource, to other node migrations, if the node of moving to contains with cancelling reserved data stream information identical among the agency, this data flow reserved resource is cancelled.If in migration, confirm agency or reservation agent if run into, cancelling the agency carries out alternately with them, judge whether the reserved data stream information of cancelling among the agency has comprised the traffic flow information of confirming agency or reservation agent, if comprised, send mobile agent notification source satellite node and carry out heavy-route, again producing reservation agent is QoS path bandwidth application resource, destroys confirming agency or reservation agent; When reservation agent finds that when applying for required bandwidth resources for the QoS path resource of certain node does not satisfy, started the reservation negotiation module this QoS request has been held consultation, idiographic flow is as follows:
Step 21: if the required resource of user differs hour with the satellite node surplus resources, send to consult to act on behalf of and hold consultation with the user, whether inquiry can reduce service request, if user's permission, revise the qos parameter information of reservation agent, in this node distribution corresponding bandwidth and the correlation behavior message that cushions the space and write down this data flow, reservation agent is moved to next node, continues as QoS path bandwidth application resource simultaneously;
Step 22: if the user disagrees with the reduction service request, judge whether link circuit resource has distributed to non-QoS path or lower grade of service request QoS path, if, then discharge certain resource, satisfy new QoS request, otherwise, consult failure;
Step 23: if when the required resource of user differs big or consults failure with the satellite node surplus resources, send the satellite node refusal QoS request of refusal agent advertisement source, and send and cancel the agency and discharge reserved resource.
Claims (2)
1. the method for ensuring satellite network service quality based on mobile agent is characterized in that by the negotiation between the mobile agent be the required bandwidth resources of QoS path allocation, and its step is as follows:
Step 1: insert the QoS service request that satellite node receives the user, by the QoS mapping block business demand is converted into qos parameter, produce reservation agent, simultaneously qos parameter, local address and purpose satellite address are loaded in the reservation agent, reservation agent is a QoS path bandwidth application resource;
Step 2: when reservation agent was moved to an intermediate node, reservation agent and information agency were mutual, calculated required resource according to business characteristic and qos requirement, and caller judges whether to accept this Business Stream; If accept, will distribute corresponding bandwidth and buffering space and write down the correlation behavior message of this data flow, bandwidth resources are reserved, reservation agent is moved to the next satellite node, if refusal then sends coordination agent advertisement source satellite node startup resource reservation negotiation module to the source satellite node and destroys reservation agent simultaneously;
Step 3: if reservation agent has arrived destination node, do not switch if star ground takes place destination node, then send one and confirm that the agency notifies its resource reservation success to destroy reservation agent simultaneously to the source satellite node, if monitoring agent discovery purpose satellite does not cover the ground receiving terminal at this moment, then send to cancel to act on behalf of and discharge reserved resource, send mobile agent notification source satellite node simultaneously and carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
Step 4:, act on behalf of by monitoring and to judge whether the source satellite node star ground takes place switch if the source satellite node receives the confirmation the agency; If do not switch, accept user's QoS request, call the control information load-on module simultaneously, the data packet head that receives is expanded, preserve the control information of bandwidth resources reserved path,, cancel the agency to the transmission of purpose satellite node and discharge reserved resource if switch, carry out heavy-route, producing reservation agent again is QoS path bandwidth application resource;
Step 5: if switch or link failure between monitoring agent discovery satellite generation star, and preserve the bandwidth resources reserved information in the satellite, this satellite produces cancels the agency, and portably use the reserved data stream information of this handoff links resource, to other node migrations, if the node of moving to contains with cancelling reserved data stream information identical among the agency, this data flow reserved resource is cancelled; If in migration, confirm agency or reservation agent if run into, cancelling the agency carries out alternately with them, judge whether the reserved data stream information of cancelling among the agency has comprised the traffic flow information of confirming agency or reservation agent, if comprised, send mobile agent notification source satellite node and carry out heavy-route, again producing reservation agent is QoS path bandwidth application resource, destroys confirming agency or reservation agent.
2. the method for ensuring satellite network service quality based on mobile agent according to claim 1, it is characterized in that described reservation negotiation module, when reservation agent finds that the resource of certain node does not satisfy during for the required bandwidth resources of QoS path application, started the reservation negotiation module this QoS request is held consultation, idiographic flow is as follows:
Step 21: if the required resource of user differs hour with the satellite node surplus resources, send to consult to act on behalf of and hold consultation with the user, whether inquiry can reduce service request, if user's permission, revise the qos parameter information of reservation agent, in this node distribution corresponding bandwidth and the correlation behavior message that cushions the space and write down this data flow, reservation agent is moved to next node, continues as QoS path bandwidth application resource simultaneously;
Step 22: if the user disagrees with the reduction service request, judge whether link circuit resource has distributed to non-QoS path or lower grade of service request QoS path, if, then discharge certain resource, satisfy new QoS request, otherwise, consult failure;
Step 23: if when the required resource of user differs big or consults failure with the satellite node surplus resources, send the satellite node refusal QoS request of refusal agent advertisement source, and send and cancel the agency and discharge reserved resource.
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