CN104917828B - A kind of CoAP agency by agreement caching methods based on node dormancy and route maintenance - Google Patents
A kind of CoAP agency by agreement caching methods based on node dormancy and route maintenance Download PDFInfo
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- CN104917828B CN104917828B CN201510283002.0A CN201510283002A CN104917828B CN 104917828 B CN104917828 B CN 104917828B CN 201510283002 A CN201510283002 A CN 201510283002A CN 104917828 B CN104917828 B CN 104917828B
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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
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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
- H04L67/01—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
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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
- 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
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- 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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Abstract
A kind of CoAP agency by agreement caching methods based on node dormancy and route maintenance are claimed in the present invention, belong to network application layer technical field.The present invention proposes a kind of CoAP agency by agreement caching methods based on node dormancy and route maintenance on the basis of CoAP (Constrained Application Protocol) agreement of resourceoriented restricted IP networks design.This method includes three contents：A kind of agent relation's maintaining method, a kind of cache resources information bank maintaining method and it is a kind of can reflect change in resources trend, storage resource take less, convenient user operation close on the expired method of inspection.Present method be advantageous in that support of the enhancing CoAP agreements to node dormancy and route maintenance network scenario, operation of the convenient user to periodicity dormancy server, can control effectively router handling capacity and network delay.
Description
Technical field
The invention belongs to network application layer technical field, and in particular to a kind of CoAP based on node dormancy and route maintenance
Agency by agreement caching method.
Background technology
CoAP (restricted application protocol) agreements are formulated by the CORE working groups of IETF, are for resource-constrained IP network
The application layer protocol standard based on REST frameworks formulated, have header expense is small, form flexibly, easy to extending, parse
The advantages such as complexity is low.
Wireless sensor network is the key technology of thing network sensing layer, miniature by large number of, distributed deployment, volume
The embedded radio communication equipment composition of change, has the characteristics that low cost, low-power consumption, storage computing resource are limited.Wireless sensing
Device network is adapted to environmental condition harshness, the mankind to be difficult to the application scenarios set foot in, and node possesses low power consumption characteristic, mostly using battery
Power supply.The problems such as bringing cost increase and security risk in this scene for node replacement battery.Therefore, node is reduced
Energy expenditure is the important subject of wireless sensor network technology.At present, wireless sensor network node supports dormancy work(
It can meet the needs in practical application to reduce energy expenditure.
For the wireless sensor network of application layer operation CoAP agreements, node is responsible for monitoring as Resource Server
The request of client (subscriber terminal equipment of the operation software such as browser or CoAP common customers end), and return and ring to client
Should.Initiator of the client as data interaction, when sending request in the case that unknown resources server is presently in state,
It may cannot be responded because of its dormancy.Therefore, the network of Resource Server dormancy must support proxy caching mechanism.
The existing reverse proxy mechanism of CoAP agreements and caching mechanism applied to the dormancy of node periodicity and route it is regular
When in the wireless network of maintenance, still have several drawbacks：Do not take into full account the scene that route maintenance causes topological relation to change,
Lack the maintenance mechanism that can be control effectively to router handling capacity and network delay；Do not take into full account that user's operation is clear
The time that device of looking at is consumed, makes troubles for the server of the direct operation cycle property dormancy of user；Proxy server reflection storage
The memory space of the variation tendency consumption of resource is more.
The content of the invention
It is insufficient present in the existing reverse proxy mechanism of CoAP agreements and caching mechanism for the prior art, propose a kind of
Operation of the convenient user to periodicity dormancy server, the base that can be control effectively to router handling capacity and network delay
It is as follows in node dormancy and the CoAP agency by agreement caching methods of route maintenance, technical scheme：One kind is based on node
Dormancy and the CoAP agency by agreement caching methods of route maintenance, it comprises the following steps：
101st, treat that node networks to finish, it is the battery-powered equipment conduct of non-electrical that power supply mode is selected in network routing table item
Candidate's proxy server, skips to step 102；
102nd, the factors such as hop count, link-quality are considered according to the actual requirements, and Resource Server is set from hop count is minimum
The optimal candidate's proxy server of standby middle selection link-quality is optimal proxy server as its proxy server, skips to step
103；
103rd, arbitrary node is as CoAP protocol resource server ends, if continuously receiving the sound that agent relation establishes failure
Answering number, then when next sending cycle arrives, sending agent relation's foundation to proxy server please not less than maximum M
Ask, skip to step 104；If the response number that CoAP Resource Servers continuously receive agent relation's foundation failure exceedes maximum
M, then the proxy server cannot act on behalf of more CoAP Resource Servers again, which needs to keep working status,
When next sending cycle arrives, judge whether optimal proxy server updates, if optimal proxy server updates, counter
Reset, skip to step 102, choose proxy server again；Otherwise, repeat step 103；
104th, after proxy server receives agent relation's foundation request that Resource Server end is sent, carry out resource and deposit
The establishment operation in storage area domain, if establishing resource storage region fails, carries out the maintenance of a cache resources information bank, creates
Resource storage region, and return to agent relation and establish response, description is created as a result, skipping to step 105；If establishing resource stores
Region success, then return to agent relation and establish response, and describes to create as a result, skipping to step 105, and each Resource Server is each
At most can only with a proxy server establishment of correspondent relationship, each proxy server can at the same time with multiple and different resources
Server establishment of correspondent relationship.
If the 105, received agent relation establishes response description agent relation and is successfully established, step 106 is skipped to；If receive
The agent relation arrived establishes response description agent relation and establishes failure, judges whether current optimal proxy server updates, if
Optimal proxy server renewal, skips to step 102；Otherwise, step 103 is skipped to；
106th, Resource Server periodically switches in resting state and working status, and is terminating resting state every time
When being transferred to working status, judge whether current optimal proxy server changes, in the event of changing, skip to step 102；
Otherwise, step 107 is skipped to；
107th, Resource Server sends renewal request to proxy server, skips to step 108；
108th, after proxy server receives renewal request, matched resource storage is searched in cache resources information bank
Region, if target resource storage region can not be navigated to, carries out the maintenance of a cache resources information bank, and take to resource
Business device returns to renewal response, and description is updated as a result, skipping to step 109；If navigating to target resource storage region, to resource
Server return renewal response, description renewal operation as a result, skipping to step 109；
If the 109, Resource Server receives the renewal response that description is updated successfully, step 110 is skipped to；If resource service
Device receives the renewal response of description positioning failure, skips to step 103；
110th, the cache resources information bank inquiry request that proxy server monitoring users are sent.Please if receiving user's inquiry
Ask, skip to step 111；Otherwise continue to monitor, repeat step 110；
111st, proxy server navigates to qualified resource storage according to screening conditions query caching resource information bank
Region, with expired testing model, the lifetime by comparing caching resource time and resource judge resource freshness (if
Cache-time has exceeded the lifetime of resource, it is believed that resource is unreliable；Otherwise it is assumed that reliable resources), then use and close on expired inspection
Proved recipe method judges the variation tendency of resource, and qualified authentic communication is returned to user together with its variation tendency information.
Further, the maintaining method of cache resources information bank is specific as follows in the step 104 and step 108：
201st, each resource storage region of cache resources information bank is scanned successively, reads what is stored in resource storage region
Server is numbered, and is carried out computing and drawn the corresponding IP address of server, skips to step 202；
202nd, the Resource Server IP address that proxy server is drawn according to computing, searches the table of routing table child nodes
, if positioned in the routing table less than corresponding list item, it is deleted；If corresponding table is navigated in the routing table
, then it is retained.
Further, it is as follows that the expired method of inspection is closed on described in the step 111：
301st, it is fixed with the expired test mode of CoAP agreements when proxy server receives the condition query request of user
Position is eligible into cache resources information bank and reliable resource storage region, skips to step 302；
302nd, in assured resources storage region after positioning change in resources trend is carried out with the expired method of inspection is closed on
Judgement, skip to step 303, when a following browser operation is completed, the variation tendency calculation formula of resource is as follows：
R=Max_age+Update_timer-Setup_wait-Request_timer (1)
Wherein, R represents the variation tendency of resource, and Max_age represents the effective time of the data of last time renewal,
Update_timer represents the renewable time of last time data, and Setup_wait represents that user completes a browser operation institute
The average time of consumption, at the time of Request_timer represents that proxy server receives user's request；
If the 303, R is more than zero, target resource is completed unchanged in the time of a following browser operation in user
Trend, without special mark in the query result of return；If R is less than or equal to zero, target resource completes future in user
Trend is changed in the time of browser operation, special mark is needed in the query result of return, skips to step 304.
304th, eligible and reliable resource information is returned to user, and according to the judgement knot for closing on the expired method of inspection
Fruit is labeled.
Advantages of the present invention and have the beneficial effect that：
Judge that whether continuously receive agent relation establishes the number of failure response more than maximum M, step in step 103
The establishment result that whether current optimal proxy server changes, resource storage region is judged in step 104 is judged in 106
And judge that Resource Server agent relation's maintaining method that the renewal result of resource storage region is triggered eases up in step 108
Support of the CoAP agreements to node dormancy and route maintenance network scenario can be strengthened by depositing resource information bank maintaining method, can be right
Router handling capacity and network delay control effectively.Change in resources trend is judged in step 111 closes on expired inspection party
Method can reduce the storage resource of proxy server consumption, while operation of the convenient user to periodicity dormancy server.
Brief description of the drawings
Fig. 1 is preferred embodiment of the present invention proxy caching mechanism works flow chart；
Fig. 2 proxy caching mechanism message interaction figures；
Fig. 3 agent relation's maintaining method work flow diagram；
Fig. 4 cache resources information bank maintaining method work flow diagrams；
Fig. 5 agent relation establishes request message form；
Fig. 6 updates request message form；
Fig. 7 agent relation establishes response message form；
Fig. 8 updates response message form.
Embodiment
Below in conjunction with attached drawing, the invention will be further described：
First, the proxy caching mechanism message interaction figure and Fig. 3 of the proxy caching mechanism works flow chart with reference to Fig. 1, Fig. 2
Agent relation's maintaining method work flow diagram, the embodiment of Resource Server is described in detail.
Step1：Treat that node networks to finish, inquire about the father node of non-battery power supply and not dormancy in its route table items, obtain
Its link quality information (RSSI), skips to Step2.
Step2：Proxy server of the father node of link-quality optimal (RSSI value is maximum) as the node is chosen, is skipped to
Step3。
Step3：Node can be used as CoAP protocol resource server ends.It is if continuously receiving message code name
The number that the agent relation of " 4.01Unauthorized " establishes response is no more than 3, then when next sending cycle arrives to
Proxy server sends agent relation and establishes request, and agent relation establishes the message format of request as shown in figure 5, skipping to Step4；
If the number that Resource Server continuously receives agent relation's foundation response that message code name is " 4.01Unauthorized " surpasses
3 are crossed, then Resource Server keeps working status, when next sending cycle arrives, judges whether optimal father node becomes
Change.If optimal father node changes, counter O reset, skips to Step2；Otherwise, Step3 is repeated.
Step4：The agent relation that Resource Server receives proxy server return establishes response.If the message of the response
Code name illustrates that agent relation is successfully established for " 2.01Created ", and Resource Server is allowed to periodically to proxy server
Data are sent, is also allowed to enter resting state, skips to Step5；If the message code name of the response is
" 4.01Unauthorized " illustrates that agent relation establishes failure, and Resource Server is not allowed to periodically to proxy server
Data are sent, are not also allowed to enter resting state.If continuously receive time of the response code name for " 4.01Unauthorized "
Number is not less than 3, then when next sending cycle arrives, sends agent relation to proxy server and establish request, skip to
Step2；Number of the code name for " 4.01Unauthorized " is responded more than 3 if continuously received, then it is assumed that current agent service
Device does not possess the ability for continuing proxy resources server, which needs to keep working status, and week is sent next
When phase arrives, judge whether optimal father node changes.If optimal father node changes, Step2 is skipped to；Otherwise, jump
To Step3.
Step5：Resource Server periodically switches in resting state and working status, is transferred to every time from resting state
During working status, judge whether optimal father node changes.If optimal father node changes, Step2 is skipped to；Otherwise,
Skip to Step6.
Step6：Resource Server sends renewal request when the update cycle arrives to proxy server, and message format is as schemed
Shown in 6, Step7 is skipped to.
Step7：Resource Server receives the renewal response of proxy server return.If the message code name of the response is
" 2.04Changed ", illustrates that agent relation is successfully established, skips to Step8；If the message code name of the response is
" 2.03Valid ", illustrates that agent relation establishes failure, skips to Step3.
Then, the proxy caching mechanism message interaction figure and Fig. 4 of the proxy caching mechanism works flow chart with reference to Fig. 1, Fig. 2
Cache resources information bank maintaining method work flow diagram, the embodiment of proxy server is described in detail.
Step1：After proxy server receives agent relation's foundation request of Resource Server, resource storage region is carried out
Establishment operation.If resource storage region successfully creates, returned packet code name is built for the agent relation of " 2.01Created "
Vertical response, message format is as shown in fig. 7, skip to Step3；If cache resources information bank is full, a cache resources are carried out
The maintenance of information bank, skips to Step2.
Step2：The server numbering stored in resource storage region is successively read, and carries out computing and show that server corresponds to
IP address, according to operation result scan routing table child nodes whole list items.If the Resource Server is not present in road
By in table, then it being deleted；If the Resource Server is present in routing table, it is retained.Scan cache resources information
After storehouse, Step3 is skipped to.
Step3：If after maintenance, establishing resource storage region is still unable to, then to Resource Server returned packet generation
Number for " 4.01Unauthorized " agent relation establish response, message format is as shown in fig. 7, skip to Step2；If by
After maintenance, can establishing resource storage region, then to Resource Server returned packet code name for " 2.01Created " agency close
System establishes response, and message format is as shown in fig. 7, skip to Step4.
Step4：Proxy server radio frequency is monitored, and after receiving the renewal request that Resource Server is sent, is believed in cache resources
Breath searches its resource storage region in storehouse.If navigating to resource storage region, it is updated, and returned packet code name is
The renewal response of " 2.04Changed ", skips to Step5；If positioning is less than the region, returned packet code name
The renewal response of " 2.03Valid ", skips to Step5.
Step5：The cache resources information bank inquiry request that proxy server monitoring users are sent, please if receiving inquiry
Ask, skip to Step5；Otherwise, continue to monitor, repeat Step5.
Step6：Proxy server navigates to qualified resource and deposits according to screening conditions query caching resource information bank
Storage area domain.Expired testing model is used again, removes insecure data.With the expired method of inspection is closed on, resource is judged
Variation tendency.The value of R (variation tendency) is calculated by formula (1).If R is more than zero, target resource is completed in user
Unchanged trend in the time of a following browser operation, without special mark in the query result of return；If R is less than
Equal to zero, then target resource is completed to change trend in the time of a following browser operation in user, in the inquiry of return
As a result special mark is needed in, skips to Step7.
Step7：Eligible and reliable resource information is returned to user, and according to the judgement for closing on the expired method of inspection
As a result it is changed the mark of trend.User can judge whether at once to carry out Resource Server straight according to the result inquired
Connect operation.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limits the scope of the invention.
After the content for having read the record of the present invention, technical staff can make various changes or modifications the present invention, these equivalent changes
Change and modification equally falls into the scope of the claims in the present invention.
Claims (3)
1. a kind of CoAP agency by agreement caching methods based on node dormancy and route maintenance, it is characterised in that including following step
Suddenly：
101st, treat that node networks to finish, selection power supply mode is the battery-powered equipment of non-electrical as candidate in network routing table item
Proxy server, skips to step 102；
102nd, hop count, link quality factors are considered according to the actual requirements, CoAP protocol resources server is from hop count minimum
It is optimal proxy server as its proxy server that the optimal candidate's proxy server of link-quality is chosen in equipment, skips to step
Rapid 103；
103rd, arbitrary node is as CoAP protocol resource server ends, if continuously receiving the response that agent relation establishes failure
Number then when next sending cycle arrives, sends agent relation to proxy server and establishes request, jump not less than maximum M
To step 104；If the response number that CoAP protocol resource servers continuously receive agent relation's foundation failure exceedes maximum
M, then the proxy server cannot act on behalf of more CoAP protocol resources servers again, which needs to keep
Working status, when next sending cycle arrives, judges whether optimal proxy server updates, if optimal proxy server
Renewal, counter O reset, skips to step 102, chooses proxy server again；Otherwise, repeat step 103；
104th, after proxy server receives agent relation's foundation request that CoAP protocol resource server ends are sent, provided
The establishment operation of source storage region, if establishing resource storage region fails, carries out the maintenance of a cache resources information bank,
Establishing resource storage region, and return to agent relation and establish response, description is created as a result, skipping to step 105；If establishing resource
Storage region success, then return to agent relation and establish response, and describes establishment as a result, skipping to step 105, each CoAP agreements money
Source server every time at most can only with a proxy server establishment of correspondent relationship, each proxy server can at the same time with it is more
A different CoAP protocol resource server establishment of correspondent relationships；
If the 105, received agent relation establishes response description agent relation and is successfully established, step 106 is skipped to；It is if received
Agent relation establishes response description agent relation and establishes failure, judges whether current optimal proxy server updates, if optimal
Proxy server updates, and skips to step 102；Otherwise, step 103 is skipped to；
106th, CoAP protocol resources server periodically switches in resting state and working status, and is terminating dormancy every time
When state is transferred to working status, judge whether current optimal proxy server changes, in the event of changing, skip to step
102；Otherwise, step 107 is skipped to；
107th, CoAP protocol resources server sends renewal request to proxy server, skips to step 108；
108th, after proxy server receives renewal request, matched resource memory block is searched in cache resources information bank
Domain, if target resource storage region can not be navigated to, carries out the maintenance of a cache resources information bank, and to CoAP agreements
Resource Server returns to renewal response, and description renewal is as a result, skip to step 109；If navigating to target resource storage region,
To CoAP protocol resources server return renewal response, description renewal operation as a result, skipping to step 109；
If the 109, CoAP protocol resources server receives the renewal response that description is updated successfully, step 110 is skipped to；If CoAP
Protocol resource server receives the renewal response of description positioning failure, skips to step 103；
110th, the cache resources information bank inquiry request that proxy server monitoring users are sent, if receiving user's inquiry request,
Skip to step 111；Otherwise continue to monitor, repeat step 110；
111st, proxy server navigates to qualified resource memory block according to screening conditions query caching resource information bank
Domain, with expired testing model, the lifetime by comparing caching resource time and resource judges the freshness of resource, then uses
The variation tendency that the expired method of inspection judges resource is closed on, and qualified authentic communication is returned together with its variation tendency information
Back to user.
2. the CoAP agency by agreement caching methods according to claim 1 based on node dormancy and route maintenance, its feature
It is, the maintaining method of cache resources information bank is specific as follows in the step 104 and step 108：
201st, each resource storage region of cache resources information bank is scanned successively, reads the service stored in resource storage region
Device is numbered, and is carried out computing and drawn the corresponding IP address of server, skips to step 202；
202nd, the CoAP protocol resource server ip address that proxy server is drawn according to computing, searches routing table child nodes
List item, if positioned in the routing table less than corresponding list item, it is deleted；If corresponding table is navigated in the routing table
, then it is retained.
3. the CoAP agency by agreement caching methods according to claim 1 based on node dormancy and route maintenance, its feature
It is, it is as follows that the expired method of inspection is closed on described in the step 111：
301st, when proxy server receives the condition query request of user, with the expired test mode of CoAP agreements, navigate to
Eligible and reliable resource storage region, skips to step 302 in cache resources information bank；
302nd, in assured resources storage region after positioning sentencing for change in resources trend is carried out with the expired method of inspection is closed on
It is disconnected, step 303 is skipped to, when a following browser operation is completed, the variation tendency calculation formula of resource is as follows：
R=Max_age+Update_timer-Setup_wait-Request_timer (1)
Wherein, R represents the variation tendency of resource, and Max_age represents the effective time of the data of last time renewal, Update_
Timer represents the renewable time of last time data, and Setup_wait represents that user completes what a browser operation was consumed
Average time, at the time of Request_timer represents that proxy server receives user's request；
If the 303, R is more than zero, target resource completes unchanged trend in the time of a following browser operation in user,
Without special mark in the query result of return；If R is less than or equal to zero, target resource is completed following once clear in user
Trend is changed in the time of device of looking at operation, special mark is needed in the query result of return, skips to step 304；
304th, return to eligible and reliable resource information to user, and according to close on the judging result of the expired method of inspection into
Rower is noted.
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