CN104917828A - CoAP (Constrained Application Protocol) proxy cache method based on node dormancy and router maintenance - Google Patents

CoAP (Constrained Application Protocol) proxy cache method based on node dormancy and router maintenance Download PDF

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Publication number
CN104917828A
CN104917828A CN201510283002.0A CN201510283002A CN104917828A CN 104917828 A CN104917828 A CN 104917828A CN 201510283002 A CN201510283002 A CN 201510283002A CN 104917828 A CN104917828 A CN 104917828A
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resource
proxy server
skip
server
coap
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CN104917828B (en
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王平
蒲宬亘
王恒
鲍娜
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/101—Server selection for load balancing based on network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
    • H04L67/5683—Storage of data provided by user terminals, i.e. reverse caching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a CoAP proxy cache method based on node dormancy and router maintenance, and belongs to the technical field of application level. The CoAP proxy cache method is designed for the CoAP of resource limited IP network. The method comprises agency relation maintenance, cache resource information base maintenance and overdue approach detection, wherein overdue approach detection can reflect change of resource, occupies less storage resource, and provides convenience for user operation. The method comprises the advantages that support for node dormancy and route maintenance of the CoAP is enhanced, convenience is provided for operation of a periodic dormancy server, and the throughput and network time delay of a router can be effectively controlled.

Description

A kind of CoAP agency by agreement caching method based on node dormancy and route maintenance
Technical field
The invention belongs to network application layer technical field, be specifically related to a kind of CoAP agency by agreement caching method based on node dormancy and route maintenance.
Background technology
CoAP (restricted application protocol) agreement is formulated by the CORE working group of IETF, it is the application layer protocol standard based on REST framework for the formulation of resource-constrained IP network,, there is the advantages such as header expense is little, form flexible, be convenient to expansion, parsing complexity is low.
Wireless sensor network is the key technology of thing network sensing layer, is made up of the embedded radio communication equipment of One's name is legion, distributed deployment, volume microminiaturization, has the features such as low cost, low-power consumption, storage computational resource be limited.Wireless sensor network is applicable to environmental condition harshness, the mankind are difficult to the application scenarios that sets foot in, and node possesses low power consumption characteristic, mostly adopts powered battery.The problems such as cost increase and potential safety hazard can be brought for node replacement battery in this scene.Therefore, the energy ezpenditure reducing node is the important subject of wireless sensor network technology.At present, wireless sensor network node supports that sleep mode is to reduce energy ezpenditure, meets the needs in practical application.
For the wireless sensor network that application layer runs CoAP agreement, node is responsible for the request of monitoring client (subscriber terminal equipment of the software such as running browser or CoAP common customer end) as Resource Server, and returns response to client.Client, as the initiator of data interaction, when sending request when the current status of unknown resources server, may can not get response because of its dormancy.Therefore, the network of Resource Server dormancy must support proxy caching mechanism.
When CoAP agreement existing reverse proxy mechanism and caching mechanism are in apply to Section property dormancy dot cycle and in the wireless network of route periodic maintenance, also come with some shortcomings: do not take into full account the sight that route maintenance causes topological relation to change, lacking can the maintenance mechanism that control effectively of routers throughput and network delay; Do not take into full account the time that user operation browser consumes, for the server of user's direct control periodicity dormancy is made troubles; The memory space that the variation tendency of proxy server reflection storage resources consumes is more.
Summary of the invention
For the deficiency existed in the existing reverse proxy mechanism of the CoAP agreement of prior art and caching mechanism, the operation of a kind of convenient user to periodicity dormancy server is proposed, can the CoAP agency by agreement caching method based on node dormancy and route maintenance that control effectively of routers throughput and network delay, technical scheme of the present invention is as follows: a kind of CoAP agency by agreement caching method based on node dormancy and route maintenance, and it comprises the following steps:
101, treat that node networks complete, in network routing table item, select supply power mode to be the battery-powered equipment of non-electrical alternatively proxy server, skip to step 102;
102, consider the factor such as jumping figure, link-quality according to the actual requirements, candidate's proxy server that Resource Server chooses link-quality optimum from the minimum equipment of jumping figure be optimum proxy server as its proxy server, skip to step 103;
103, arbitrary node is as CoAP protocol resource server end, if receive agent relation continuously to set up failed response number and do not exceed maximum M, then when the next one sends cycle arrival, send agent relation to proxy server and set up request, skip to step 104; If CoAP Resource Server receives agent relation continuously and sets up failed response number and exceed maximum M, then this proxy server can not act on behalf of more CoAP Resource Servers again, this Resource Server needs to keep operating state, when the next one sends cycle arrival, judge whether optimum proxy server upgrades, if optimum proxy server upgrades, counter O reset, skip to step 102, again choose proxy server; Otherwise, repeat step 103;
104, proxy server receives after agent relation that Resource Server end sends sets up request, carry out the creation operation in Resource Storage region, if the failure of establishing resource storage area, then carry out the maintenance of a cache resources information bank, establishing resource storage area, and return agent relation and set up response, describe and create result, skip to step 105; If the success of establishing resource storage area, then return agent relation and set up response, and establishment result is described, skip to step 105, each Resource Server at every turn at most can only with a proxy server establishment of correspondent relationship, each proxy server can simultaneously from multiple different Resource Server establishment of correspondent relationship.
If 105 agent relation received set up response description agent relation and are successfully established, skip to step 106; If the agent relation received sets up response description agent relation and sets up failure, judge whether current optimum proxy server upgrades, if optimum proxy server upgrades, skip to step 102; Otherwise, skip to step 103;
106, Resource Server periodically switches in resting state and operating state, and when terminating resting state and proceed to operating state at every turn, judges whether current optimum proxy server changes, if changed, skips to step 102; Otherwise, skip to step 107;
107, Resource Server sends update request to proxy server, skips to step 108;
108, after proxy server receives update request, the Resource Storage region of coupling is searched in cache resources information bank, if target resource storage area cannot be navigated to, then carry out the maintenance of a cache resources information bank, and return renewal response to Resource Server, describe and upgrade result, skip to step 109; If navigate to target resource storage area, then return to Resource Server and upgrade response, describe the result of renewal rewards theory, skip to step 109;
If 109 Resource Servers receive the renewal response describing and be updated successfully, skip to step 110; If Resource Server receives describe the failed renewal response in location, skip to step 103;
110, the cache resources information bank inquiry request of proxy server monitoring users transmission.If receive user's inquiry request, skip to step 111; Otherwise continue to monitor, repeat step 110;
111, proxy server is according to screening conditions query caching resource information bank, navigate to qualified Resource Storage region, use expired testing model, judge that the freshness of resource (if cache-time has exceeded the lifetime of resource, thinks that resource is unreliable by the lifetime of comparing caching resource time and resource; Otherwise, think reliable resources), then use and close on the variation tendency that the expired method of inspection judges resource, and qualified authentic communication is returned to user together with its variation tendency information.
Further, in described step 104 and step 108, the maintaining method of cache resources information bank is specific as follows:
201, scan each Resource Storage region of cache resources information bank successively, read the server numbering stored in Resource Storage region, row operation of going forward side by side draws and skips to step 202 in the IP address that server is corresponding;
202, the Resource Server IP address that draws according to computing of proxy server, searches the list item of routing table child nodes, if locate the list item less than correspondence in the routing table, then by it deletion; If navigate to corresponding list item in the routing table, then by it reservation.
Further, the expired method of inspection is closed on described in described step 111 as follows:
301, when proxy server receives the condition query request of user, use the expired test mode of CoAP agreement, navigate to eligible in cache resources information bank and reliable Resource Storage region, skip to step 302;
302, close in assured resources storage area utilization after positioning the judgement that the expired method of inspection carries out change in resources trend, skip to step 303, in time completing a following browser operation, the variation tendency computing formula of resource is as follows:
R＝Max_age+Update_timer-Setup_wait-Request_timer (1)
Wherein, R represents the variation tendency of resource, Max_age represents effective duration of the last data upgraded, Update_timer represents the updated time of last data, Setup_wait represents the average time that user completes browser operation and consumes, and Request_timer represents that proxy server receives the moment of user's request;
If 303 R are greater than zero, then target resource unchanged trend within the time that user completes a following browser operation, without the need to special mark in the Query Result returned; If R is less than or equal to zero, then target resource changes trend within the time that user completes a following browser operation, needs special mark, skip to step 304 in the Query Result returned.
304, return eligible and reliable resource information to user, and mark according to the judged result of closing on the expired method of inspection.
Advantage of the present invention and beneficial effect as follows:
Judge to receive continuously number that agent relation sets up failure response in step 103 whether to exceed in maximum M, step 106 and judge whether current optimum proxy server changes, judge to judge in the establishment result in Resource Storage region and step 108 that the Resource Server agent relation maintaining method that the renewal result in Resource Storage region triggers and buffer memory resource information bank maintaining method can strengthen the support of CoAP agreement to node dormancy and route maintenance network scenario in step 104, can routers throughput and network delay control effectively.What judge change in resources trend in step 111 closes on the storage resources that the expired method of inspection can reduce proxy server consumption, and convenient user is to the operation of periodicity dormancy server simultaneously.
Accompanying drawing explanation
Fig. 1 is preferred embodiment of the present invention proxy caching mechanism works flow chart;
Fig. 2 proxy caching mechanism message interaction figure;
Fig. 3 agent relation's maintaining method workflow diagram;
Fig. 4 cache resources information bank maintaining method workflow diagram;
Fig. 5 agent relation sets up request message form;
Fig. 6 update request message format;
Fig. 7 agent relation sets up response message form;
Fig. 8 upgrades response message form.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
First, agent relation's maintaining method workflow diagram of the proxy caching mechanism works flow chart of composition graphs 1, proxy caching mechanism message interaction figure and Fig. 3 of Fig. 2, is described in detail the embodiment of Resource Server.
Step1: treat that node networks complete, inquire about non-battery in its route table items and power and the father node of not dormancy, obtain its link quality information (RSSI), skip to Step2.
Step2: the father node choosing link-quality optimum (RSSI value is maximum), as the proxy server of this node, skips to Step3.
Step3: namely node can be used as CoAP protocol resource server end.If receiving message code name is continuously that the number that the agent relation of " 4.01 Unauthorized " sets up response is no more than 3, then send agent relation when the next one sends cycle arrival to proxy server and set up request, agent relation sets up the message format of request as shown in Figure 5, skips to Step4; If it is that the agent relation of " 4.01 Unauthorized " sets up the number of response more than 3 that Resource Server receives message code name continuously, then Resource Server keeps operating state, the next one send the cycle arrive time, judge whether optimum father node changes.If optimum father node changes, counter O reset skips to Step2; Otherwise, repeat Step3.
Step4: Resource Server receives the agent relation that proxy server returns and sets up response.If for " 2.01 Created ", the message code name of this response illustrates that agent relation is successfully established, Resource Server is allowed to periodically send data to proxy server, is also allowed to enter resting state, skips to Step5; If for " 4.01 Unauthorized ", the message code name of this response illustrates that agent relation sets up failure, Resource Server is not allowed to periodically send data to proxy server, is not allowed to enter resting state yet.If receive continuously response code name be the number of times of " 4.01 Unauthorized " more than 3, then the next one send the cycle arrive time, to proxy server transmission agent relation set up request, skip to Step2; If receiving response code name is continuously that the number of times of " 4.01Unauthorized " is more than 3, then think that current proxy server does not possess the ability continuing proxy resources server, this Resource Server needs to keep operating state, when the next one sends cycle arrival, judge whether optimum father node changes.If optimum father node changes, skip to Step2; Otherwise, skip to Step3.
Step5: Resource Server periodically switches in resting state and operating state, when proceeding to operating state from resting state, judges whether optimum father node changes at every turn.If optimum father node changes, skip to Step2; Otherwise, skip to Step6.
Step6: Resource Server sends update request when the update cycle arrives to proxy server, message format as shown in Figure 6, skips to Step7.
Step7: Resource Server receives the renewal response that proxy server returns.If the message code name of this response is " 2.04 Changed ", illustrates that agent relation is successfully established, skip to Step8; If the message code name of this response is " 2.03 Valid ", illustrates that agent relation sets up failure, skip to Step3.
Then, the cache resources information bank maintaining method workflow diagram of the proxy caching mechanism works flow chart of composition graphs 1, proxy caching mechanism message interaction figure and Fig. 4 of Fig. 2, is described in detail the embodiment of proxy server.
Step1: after the agent relation that proxy server receives Resource Server sets up request, carry out the creation operation in Resource Storage region.If Resource Storage region successfully creates, then returned packet code name is that the agent relation of " 2.01 Created " sets up response, and message format as shown in Figure 7, skips to Step3; If cache resources information bank is full, then carries out the maintenance of a cache resources information bank, skip to Step2.
Step2: read the server numbering stored in Resource Storage region successively, row operation of going forward side by side draws the IP address that server is corresponding, according to whole list items of operation result scanning routing table child nodes.If this Resource Server is not present in routing table, then by it deletion; If this Resource Server is present in routing table, then by it reservation.After scanning cache resources information bank, skip to Step3.
Step3: if after safeguarding, still can not establishing resource storage area, then the agent relation being " 4.01 Unauthorized " to Resource Server returned packet code name sets up response, and message format as shown in Figure 7, skips to Step2; If after safeguarding, can establishing resource storage area, then the agent relation being " 2.01 Created " to Resource Server returned packet code name sets up response, and message format as shown in Figure 7, skips to Step4.
Step4: proxy server radio frequency is monitored, after receiving the update request that Resource Server sends, searches its Resource Storage region in cache resources information bank.If navigate to Resource Storage region, then by it renewal, and returned packet code name is the renewal response of " 2.04 Changed ", skips to Step5; If location is less than this region, then returned packet code name is the renewal response of " 2.03 Valid ", skips to Step5.
Step5: the cache resources information bank inquiry request that proxy server monitoring users sends, if receive inquiry request, skips to Step5; Otherwise, continue to monitor, repeat Step5.
Step6: proxy server, according to screening conditions query caching resource information bank, navigates to qualified Resource Storage region.Use expired testing model again, remove insecure data.Close on the expired method of inspection in utilization, judge the variation tendency of resource.The value of R (variation tendency) is calculated by formula (1).If R is greater than zero, then target resource unchanged trend within the time that user completes a following browser operation, without the need to special mark in the Query Result returned; If R is less than or equal to zero, then target resource changes trend within the time that user completes a following browser operation, needs special mark, skip to Step7 in the Query Result returned.
Step7: return eligible and reliable resource information to user, and carry out the mark of variation tendency according to the judged result of closing on the expired method of inspection.User can judge whether according to the result inquired at once to carry out direct control to Resource Server.
These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention above.After the content of reading record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.

Claims (3)

1., based on a CoAP agency by agreement caching method for node dormancy and route maintenance, it is characterized in that, comprise the following steps:
101, treat that node networks complete, in network routing table item, select supply power mode to be the battery-powered equipment of non-electrical alternatively proxy server, skip to step 102;
102, consider the factor such as jumping figure, link-quality according to the actual requirements, candidate's proxy server that Resource Server chooses link-quality optimum from the minimum equipment of jumping figure be optimum proxy server as its proxy server, skip to step 103;
103, arbitrary node is as CoAP protocol resource server end, if receive agent relation continuously to set up failed response number and do not exceed maximum M, then when the next one sends cycle arrival, send agent relation to proxy server and set up request, skip to step 104; If CoAP Resource Server receives agent relation continuously and sets up failed response number and exceed maximum M, then this proxy server can not act on behalf of more CoAP Resource Servers again, this Resource Server needs to keep operating state, when the next one sends cycle arrival, judge whether optimum proxy server upgrades, if optimum proxy server upgrades, counter O reset, skip to step 102, again choose proxy server; Otherwise, repeat step 103;
104, proxy server receives after agent relation that Resource Server end sends sets up request, carry out the creation operation in Resource Storage region, if the failure of establishing resource storage area, then carry out the maintenance of a cache resources information bank, establishing resource storage area, and return agent relation and set up response, describe and create result, skip to step 105; If the success of establishing resource storage area, then return agent relation and set up response, and establishment result is described, skip to step 105, each Resource Server at every turn at most can only with a proxy server establishment of correspondent relationship, each proxy server can simultaneously from multiple different Resource Server establishment of correspondent relationship.
If 105 agent relation received set up response description agent relation and are successfully established, skip to step 106; If the agent relation received sets up response description agent relation and sets up failure, judge whether current optimum proxy server upgrades, if optimum proxy server upgrades, skip to step 102; Otherwise, skip to step 103;
106, Resource Server periodically switches in resting state and operating state, and when terminating resting state and proceed to operating state at every turn, judges whether current optimum proxy server changes, if changed, skips to step 102; Otherwise, skip to step 107;
107, Resource Server sends update request to proxy server, skips to step 108;
108, after proxy server receives update request, the Resource Storage region of coupling is searched in cache resources information bank, if target resource storage area cannot be navigated to, then carry out the maintenance of a cache resources information bank, and return renewal response to Resource Server, describe and upgrade result, skip to step 109; If navigate to target resource storage area, then return to Resource Server and upgrade response, describe the result of renewal rewards theory, skip to step 109;
If 109 Resource Servers receive the renewal response describing and be updated successfully, skip to step 110; If Resource Server receives describe the failed renewal response in location, skip to step 103;
110, the cache resources information bank inquiry request of proxy server monitoring users transmission.If receive user's inquiry request, skip to step 111; Otherwise continue to monitor, repeat step 110;
111, proxy server is according to screening conditions query caching resource information bank, navigate to qualified Resource Storage region, use expired testing model, the freshness of resource is judged by the lifetime of comparing caching resource time and resource, use again and close on the variation tendency that the expired method of inspection judges resource, and qualified authentic communication is returned to user together with its variation tendency information.
2. the CoAP agency by agreement caching method based on node dormancy and route maintenance according to claim 1, is characterized in that, in described step 104 and step 108, the maintaining method of cache resources information bank is specific as follows:
201, scan each Resource Storage region of cache resources information bank successively, read the server numbering stored in Resource Storage region, row operation of going forward side by side draws and skips to step 202 in the IP address that server is corresponding;
202, the Resource Server IP address that draws according to computing of proxy server, searches the list item of routing table child nodes, if locate the list item less than correspondence in the routing table, then by it deletion; If navigate to corresponding list item in the routing table, then by it reservation.
3. the CoAP agency by agreement caching method based on node dormancy and route maintenance according to claim 1, is characterized in that, it is as follows to close on the expired method of inspection described in described step 111:
301, when proxy server receives the condition query request of user, use the expired test mode of CoAP agreement, navigate to eligible in cache resources information bank and reliable Resource Storage region, skip to step 302;
302, close in assured resources storage area utilization after positioning the judgement that the expired method of inspection carries out change in resources trend, skip to step 303, in time completing a following browser operation, the variation tendency computing formula of resource is as follows:
R＝Max_age+Update_timer-Setup_wait-Request_timer (1)
Wherein, R represents the variation tendency of resource, Max_age represents effective duration of the last data upgraded, Update_timer represents the updated time of last data, Setup_wait represents the average time that user completes browser operation and consumes, and Request_timer represents that proxy server receives the moment of user's request;
If 303 R are greater than zero, then target resource unchanged trend within the time that user completes a following browser operation, without the need to special mark in the Query Result returned; If R is less than or equal to zero, then target resource changes trend within the time that user completes a following browser operation, needs special mark, skip to step 304 in the Query Result returned.
304, return eligible and reliable resource information to user, and mark according to the judged result of closing on the expired method of inspection.
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CN105847420A (en) * 2016-05-16 2016-08-10 重庆邮电大学 OPC UA sleep proxy method suitable for wireless on-site device
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