CN105407141B - A kind of content distribution method and system and a kind of FiWi node device - Google Patents
A kind of content distribution method and system and a kind of FiWi node device Download PDFInfo
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- CN105407141B CN105407141B CN201510698357.6A CN201510698357A CN105407141B CN 105407141 B CN105407141 B CN 105407141B CN 201510698357 A CN201510698357 A CN 201510698357A CN 105407141 B CN105407141 B CN 105407141B
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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
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
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Abstract
The invention discloses a kind of content distribution method and system and a kind of FiWi node devices.The described method includes: the cache contents on each FiWi node in light and wireless FiWi converged network；Wherein, content can be transmitted by optical fiber link between each FiWi node, reduces core net flow.When the content requests that the terminal device that a current FiWi node receives the wireless access current FiWi node is sent: if being cached with the content of user's request on current FiWi node, which is sent to the terminal device for the content that the user of own cache requests；If the content for not having cache user to request on current FiWi node, the current FiWi node is dispatched by controller centralized control to be obtained the content of user's request from other FiWi nodes and is sent to the terminal device, it avoids and is exchanged with each other information with other nodes, to reduce the expense and propagation delay time of node device.
Description
Technical field
The present invention relates to network technique field, in particular to a kind of content distribution method, FiWi node device and content point
Hair system.
Background technique
With the development of broadband network and mobile Internet and being widely used for mobile intelligent terminal, user is to video etc.
The demand of content distributing service sharply increases.The mobile flow in the whole world of explosive increase increases heavy pressure to network capacity
Power.Research shows that largely moving flow in network is identical content (especially HD video) production for repeating transmission user's request
Raw a large amount of redundant flow.
It is a kind of effective solution party for reducing network redundancy flow, alleviating network load pressure in network edge deployment caching
Method.Existing content distributing network (CDN, Content Delivery Network) is one of widely applied caching technology, CDN
Cache server is deployed in network edge, the content of original distal end service server is copied on Edge Server, to reach
Quick, reliability services purposes are provided to for user, help to reduce network capacity consumption and time delay.
But it when mobile subscriber terminal requests a network video, to be obtained from CDN server, video reaches user's end
Will be by core net and access net before end, this not only adds video time delays, also increase the load pressure of core net.
Summary of the invention
In view of problem above, propose on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State a kind of content distribution method, FiWi node device and content distribution system of problem.
According to one aspect of the present invention, a kind of content point-score method is provided.The method comprising the steps of: in light and wirelessly
Cache contents on each FiWi node in FiWi converged network；Wherein, the content cached on each FiWi node is not exactly the same, respectively
Between FiWi node content can be transmitted by optical fiber link；When a current FiWi node receives the wireless access current FiWi
When the content requests that the terminal device of node is sent: if being cached with the content of user's request on current FiWi node, this is current
The content that the user of own cache requests is sent to the terminal device by FiWi node；If without slow on current FiWi node
The content of user's request is deposited, which obtains the content of user's request from other FiWi nodes and be sent to the end
End equipment.
Optionally, if being cached with the content of user's request on current FiWi node, which delays itself
It includes: that current FiWi node receives the content that the user sends that the content for the user's request deposited, which is sent to the terminal device,
After request, first judge in the flow table of itself with the presence or absence of the item for the content matching requested with user；It is then straight if there is occurrence
It connects and the content of user's request of own cache is sent to the terminal device；Xiang Zexiang master controller if there is no match
It sends the content requests, receives master controller and redirect content requests back and the content about user request
The content that the user of own cache requests is sent to the terminal device by flow table, current FiWi node.
Optionally, if the content for not having cache user to request on current FiWi node, the current FiWi node from other
It includes: that current FiWi node receives the user that FiWi node, which obtains the content of user's request and is sent to the terminal device,
After the content requests of transmission, first judge in the flow table of itself with the presence or absence of the item for the content matching requested with user；If do not deposited
In occurrence, current FiWi node sends the content requests to master controller, receives master controller scheduling other
The content for the user request that FiWi node is sent by optical fiber link, and receive that master controller sends about the use
The flow table of the content of family request；The content that the user received requests is sent to the terminal and set by current FiWi node
It is standby；If there is occurrence, then the content requests that the user sends are redirected to accordingly by current FiWi node according to flow table
FiWi node, receive the content for the user request that the corresponding FiWi node is sent by optical fiber link, be sent to institute
State terminal device.
According to another aspect of the invention, a kind of FiWi node device is provided, which melts with FiWi
Content can be transmitted by optical fiber link between other FiWi node devices in network by closing；The FiWi node device includes: caching
Unit is used for cache contents；Content distribution unit, what the terminal device for receiving the wireless access FiWi node device was sent
Content requests；When for being cached with the content of user's request in the cache unit, the user in cache unit is asked
The content asked is sent to the terminal device；When for not caching the content of user's request in the cache unit,
The content of user's request is obtained from other FiWi node devices and is sent to the terminal device.
Optionally, when being cached with the content of user's request in FiWi node device cache unit,
The content distribution unit, for first judging the stream of itself after receiving the content requests that the user sends
With the presence or absence of the item for the content matching requested with user in table；Then directly the user in cache unit is asked if there is occurrence
The content asked is sent to the terminal device；Xiang Zexiang master controller if there is no match sends the content requests, connects
The flow table that master controller redirects content requests back and the content about user request is received, will be delayed in cache unit
The content for the user's request deposited is sent to the terminal device.
Optionally, when not caching the content of user's request in FiWi node device cache unit,
The content distribution unit, for first judging the stream of itself after receiving the content requests that the user sends
With the presence or absence of the item for the content matching requested with user in table；Item if there is no match is sent in described to master controller
Hold request, receive the content that other FiWi nodes of master controller scheduling are requested by the user that optical fiber link is sent,
And the flow table for the content about user request that master controller is sent is received, it will be in the user that received request
Appearance is sent to the terminal device；If there is occurrence, then redirected according to the content requests that flow table sends the user
To corresponding FiWi node device, receive in the user request that the corresponding FiWi node is sent by optical fiber link
Hold, and is sent to the terminal device.
According to another aspect of the invention, a kind of content point-score system is provided, which includes: to merge positioned at FiWi
Master controller and multiple above-mentioned FiWi node devices in network；The incomplete phase of content cached on each FiWi node device
Together, content can be transmitted by optical fiber link between each FiWi node device；Master controller includes: storage unit and control processing
Unit；The storage unit, for saving FiWi nodal cache inventory；It is wherein had recorded in FiWi nodal cache inventory each
The content cached on FiWi node device；The control processing unit, for receiving what current FiWi node device was sent
After content requests, judge that the user whether has been cached in the current FiWi node device to be requested according to FiWi nodal cache inventory
Content；It is that the content requests that the user sends are redirected to the current FiWi node device, and to the current FiWi
Node device sends the flow table for the content requested about the user；Otherwise caching has been searched according to FiWi nodal cache inventory
The content requests that the user sends, are redirected to find out by other FiWi node devices for stating the content of user's request
FiWi node device, and corresponding flow table is sent respectively to the FiWi node device and the current FiWi node device found out,
So that the content that the user of caching requests is sent to this currently by optical fiber link by the FiWi node device found out
FiWi node device, then terminal device is sent to by the current FiWi node device.
Optionally, processing unit is controlled, is cached with for having been searched in the caching inventory uploaded according to all FiWi nodes
When other multiple FiWi node devices of the content of user's request, therefrom selected according to minimum transfer time delay and cost principle
The content requests that the user sends, are redirected to the FiWi node device of selection by one FiWi node device, and to selection
FiWi node device and the current FiWi node device send corresponding flow table respectively.
The beneficial effect of the embodiment of the present invention is: cache contents on each FiWi node in FiWi converged network；Wherein, respectively
The content cached on FiWi node is not exactly the same, can transmit content by optical fiber link between each FiWi node, avoid pair
The load pressure of core net exchange, reduces core net flow；The terminal device of user is requested to the FiWi node currently connected
Content, if the current FiWi nodal cache content, is sent to the terminal device for own cache, if current FiWi section
Point does not cache the content, then will obtain the content of user's request from other FiWi nodes and be sent to the terminal device, keep away
Exempt to be exchanged with each other information with other nodes, to reduce the expense and propagation delay time of node device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the FiWi converged network in the embodiment of the present invention；
Fig. 2 is a kind of content distribution method flow chart provided in an embodiment of the present invention；
Fig. 3 is content distribution process example schematic one in a kind of FiWi converged network provided in an embodiment of the present invention；
Fig. 4 is content distribution process example schematic two in a kind of FiWi converged network provided in an embodiment of the present invention；
Fig. 5 is a kind of FiWi node device structural schematic diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of content distribution system structural schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Above content illustrate be only technical solution of the present invention general introduction, in order to more have a clear understanding of technology of the invention
Means, and being implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, technical characteristic and
Advantage can be more obvious and easy to understand, is described in further detail below with reference to attached drawing to a specific embodiment of the invention.
To meet the needs of user is to network high bandwidth, seamless coverage, flexible access, light and wireless (FiWi, Fiber-
Wireless) converged network is come into being.FiWi network is the networking plan for merging soft exchange with wireless access way, collection
Closed the high broadband of optical fiber connecting method and the high flexibility advantage of wireless access way, have anti-electromagnetic interference capability it is strong, can
To provide sufficiently large bandwidth, the advantages that bit error rate is lower.
Fig. 1 is the structural schematic diagram of the FiWi converged network in the embodiment of the present invention.Referring to Fig. 1, FiWi converged network packet
Fiber subnet, wireless sub network and FiWi node are included, is connected between FiWi node by fiber subnet, FiWi node and optical fiber
Net carries out centralized control by master controller.Using centralized control, can be in communication with each other between FiWi node without via core
The exchange of heart net.User terminal such as smart phone, laptop, PAD in FiWi converged network etc. is by being wirelessly connected to
FiWi node is to obtain the contents such as video.
FiWi converged network distributed caching method in technical solution of the present invention is a kind of close to subscriber terminal equipment
Access net FiWi node on dispose the solution of caching.When terminal device transmission content requests, judged by master controller
Whether requested content such as video etc. is buffered in the FiWi node that terminal device currently connects, if premises equipment requests
Content in current FiWi node, first from connection terminal device current FiWi nodal cache in distribute content；If eventually
The content of end equipment request then judges that requested content for example regards by master controller not in the FiWi node currently connected
Whether frequency etc. caches in other FiWi nodes in a network, and wherein according to the selection of the principle of minimal time delay or minimum transfer cost
The content of request is transmitted to currently by the most suitable FiWi node for caching the content by optical fiber link from selected FiWi node
FiWi node, is distributed to terminal device.Specific implementation process is as shown in Figure 2, Figure 3 and Figure 4.
Fig. 2 is a kind of content distribution method flow chart provided in an embodiment of the present invention.Net is merged in FiWi as shown in Figure 1
Cache contents on each FiWi node in network；Wherein, the content cached on each FiWi node is not exactly the same, each FiWi node it
Between can transmit content by optical fiber link.Then referring to fig. 2, a kind of content distribution method provided in an embodiment of the present invention includes:
Step S210, when a current FiWi node receives the terminal device transmission of the wireless access current FiWi node
Content requests when:
Step S220, if being cached with the content of user's request on current FiWi node, the current FiWi node by itself
The content of user's request of caching is sent to the terminal device；
Step S230, if the content for not having cache user to request on current FiWi node, the current FiWi node from its
His FiWi node obtains the content of user's request and is sent to the terminal device.
Cache contents on each FiWi node in method shown in Fig. 2 in FiWi converged network；Wherein, on each FiWi node
The content of caching is not exactly the same, can transmit content by optical fiber link between each FiWi node, avoid and exchange core net
Load pressure；The terminal device of user is to the FiWi node request content currently connected, if current FiWi nodal cache should
Own cache is then sent to the terminal device by content, will be from other if current FiWi node does not cache the content
FiWi node obtains the content of user's request and is sent to the terminal device, avoids and is exchanged with each other information with other nodes,
To reduce the expense and propagation delay time of node device.
In one embodiment of the invention, if on current FiWi node described in the step S220 in method shown in Fig. 2
It is cached with the content of user's request, which is sent to the terminal for the content that the user of own cache requests and sets
It is standby to include:
After current FiWi node receives the content requests that the user sends, first judge to whether there is in the flow table of itself
With the item of the content matching of user's request；Then directly the content that the user of own cache requests is sent to if there is occurrence
The terminal device；Xiang Zexiang master controller if there is no match sends the content requests, receives master controller weight
The flow table of the content requests of orientation back and the content about user request, current FiWi node is by the user of own cache
The content of request is sent to the terminal device.
In order to further clearly demonstrate above scheme, it is illustrated below according to Fig. 3.
Fig. 3 is content distribution process example schematic one in a kind of FiWi converged network provided in an embodiment of the present invention.?
In the present embodiment, cache contents on each FiWi node in FiWi converged network；Wherein, the content cached on each FiWi node is not
It is identical, between each FiWi node content can be transmitted by optical fiber link.Each FiWi node in FiWi converged network includes
FiWi node A and FiWi node B.Terminal device A accesses the FiWi node A in FiWi converged network, saves on master controller
FiWi nodal cache inventory wherein has recorded the content cached on each FiWi node device in FiWi nodal cache inventory.Ginseng
See Fig. 3, which specifically includes:
Terminal device A sends the request of video content A to current FiWi node A, in current FiWi node A itself flow table not
In the presence of the occurrence with video content A, the request of video content A is sent to master controller；Master controller is saved according to FiWi
Whether point content caching inventory detection video content A is buffered in current FiWi node A, such as detects the view of terminal device A request
For frequency content A in current FiWi node A, master controller redirects the request of video content A to current FiWi node A, and to working as
Preceding FiWi node A issues flow table, and video content A is sent terminal device A by current FiWi node A.
When another terminal device B sends the request of same video content A to current FiWi node A, current FiWi node A
There is the occurrence with video content A in itself flow table, then current FiWi node A directly sends out the video content A of own cache
Give terminal device A.
In one embodiment of the invention, if on current FiWi node described in the step S230 in method shown in Fig. 2
The content for not having cache user to request, the current FiWi node obtain the content of user's request from other FiWi nodes and are sent to
The terminal device includes:
After current FiWi node receives the content requests that the user sends, first judge to whether there is in the flow table of itself
With the item of the content matching of user's request；Item if there is no match, current FiWi node are sent in described to master controller
Hold request, receive the content that other FiWi nodes of master controller scheduling are requested by the user that optical fiber link is sent,
And receive the flow table for the content about user request that master controller is sent；Described in current FiWi node will receive
The content of user's request is sent to the terminal device；If there is occurrence, then current FiWi node will be described according to flow table
Content requests are redirected to corresponding FiWi node, receive the user that the corresponding FiWi node is sent by optical fiber link
The content of request is sent to the terminal device.
In order to further clearly demonstrate above scheme, it is illustrated below according to Fig. 4.
Fig. 4 is content distribution process example schematic two in a kind of FiWi converged network provided in an embodiment of the present invention.?
In the present embodiment, cache contents on each FiWi node in FiWi converged network；Wherein, the content cached on each FiWi node is not
It is identical, between each FiWi node content can be transmitted by optical fiber link.Each FiWi node in FiWi converged network includes
FiWi node A and FiWi node B.Terminal device A accesses the FiWi node A in FiWi converged network, saves on master controller
FiWi nodal cache inventory wherein has recorded the content cached on each FiWi node device in FiWi nodal cache inventory.Ginseng
See Fig. 4, which specifically includes:
Terminal device A sends the request of video content A to current FiWi node A, in current FiWi node A itself flow table not
In the presence of the occurrence with video content A, the request of video content A is sent to master controller；Master controller is saved according to FiWi
Whether point content caching inventory detection video content A is buffered in adjacent FiWi node B, such as detects the view of terminal device A request
For frequency content A in adjacent FiWi node B, master controller redirects the request of video content A to adjacent FiWi node B, and to phase
Adjacent FiWi node B issues flow table；The video content A of request is transferred to current FiWi node A from adjacent FiWi node B, and to
Current FiWi node A issues flow table, and video content A is sent terminal device A by current FiWi node A.
When another terminal device B, which sends same video content A to current FiWi node A, to be requested, current FiWi node A is certainly
There is occurrence with video content A in body flow table, master controller can be with according to the flow table for being handed down to adjacent FiWi node B
The request of video content A is directly redirected to adjacent FiWi node B, video content A is transferred to from adjacent FiWi node B and is worked as
Video content A is sent terminal device A by preceding FiWi node A, current FiWi node.
Fig. 5 is a kind of FiWi node device structural schematic diagram provided in an embodiment of the present invention.
As shown in Figure 1, can lead between other FiWi node devices in a FiWi node device and FiWi converged network
Cross optical fiber link transmission content；
As shown in figure 5, FiWi node device 500 includes:
Cache unit 510 is used for cache contents；
Content distribution unit 520, the content that the terminal device for receiving the wireless access FiWi node device is sent are asked
It asks；When for being cached with the content of user's request in the cache unit 510, the user in cache unit 510 is asked
The content asked is sent to the terminal device；For not caching the content of user's request in the cache unit 510
When, the content of user's request is obtained from other FiWi node devices and is sent to the terminal device.
Furthermore, it is understood that as shown in Fig. 1 and Fig. 5, the cache unit 510 and content distribution unit of FiWi node device
520 are directly connected to, while the content distribution unit 520 of FiWi node device passes through fiber subnet and other FiWi node devices
Content distribution unit 520 establishes connection；The content distribution unit 520 of FiWi node device is whole by wireless access way and user
Connection is established at end.
When being cached with the content of user's request in the cache unit 510, the content distribution unit 520 is used for
After receiving the content requests that the user sends, first judge in the flow table of itself with the presence or absence of the content requested with user
The item matched；Content if there is occurrence then directly by user's request in cache unit 510 is sent to the terminal device；
Xiang Zexiang master controller if there is no match sends the content requests, receives master controller and redirects content back
The flow table of request and the content about user request, the content that the user cached in cache unit 510 requests is sent to
The terminal device.The above is illustrated referring to the specific implementation process of Fig. 3.
When not caching the content of user's request in the cache unit 510, the content distribution unit 520 is used
In after the content requests for receiving user's transmission, first judge in the flow table of itself with the presence or absence of the content requested with user
Matched item；Item if there is no match sends the content requests to master controller, receives master controller scheduling its
The content for the user request that his FiWi node is sent by optical fiber link, and receive that master controller sends about this
The content that the user received requests is sent to the terminal device by the flow table of the content of user's request；If there is
The content requests are then redirected to corresponding FiWi node device according to flow table by occurrence, receive the corresponding FiWi section
The content for the user request that point is sent by optical fiber link, and it is sent to the terminal device.It is described above referring to fig. 4
Specific implementation process citing.
Fig. 6 is a kind of content distribution system structural schematic diagram provided in an embodiment of the present invention.The system includes: positioned at FiWi
Master controller and multiple above-described FiWi node devices in converged network；
As shown in Figure 1, the content cached on each FiWi node device is not exactly the same, can lead between each FiWi node device
Cross optical fiber link transferring content；
As shown in fig. 6, master controller 600 includes: storage unit 610 and control processing unit 620；The storage unit
610, for saving FiWi nodal cache inventory；It wherein has recorded in FiWi nodal cache inventory and delays on each FiWi node device
The content deposited；
The control processing unit 620, for after receiving the content requests that current FiWi node device is sent, according to
FiWi nodal cache inventory judges the content that user's request whether has been cached in the current FiWi node device；It is then by institute
The content requests for stating user's transmission are redirected to the current FiWi node device, and to the current FiWi node device send about
The flow table of the content of user request；Otherwise the content for being cached with user's request has been searched according to FiWi nodal cache inventory
Other FiWi node devices, the content requests are redirected to the FiWi node device found out, and to finding out
FiWi node device and the current FiWi node device send corresponding flow table respectively, so that the FiWi node device found out
The content that the user of caching requests is sent to the current FiWi node device by optical fiber link, then by the current FiWi
Node device is sent to terminal device.The above is illustrated referring to the specific implementation process of Fig. 3 and Fig. 4.
The control processing unit 620 is cached with for having searched in the caching inventory uploaded according to all FiWi nodes
When other multiple FiWi node devices of the content of user's request, therefrom selected according to minimum transfer time delay and cost principle
The content requests, are redirected to the FiWi node device of selection by one FiWi node device, and to the FiWi node of selection
Equipment and the current FiWi node device send corresponding flow table respectively.For example, the control processing unit of master controller
620 by the lookup corresponding with the video inventory in storage unit 610 of cache node address, and combines network link real-time status, according to
According to minimal time delay and transmission cost principle, the FiWi for suitably caching the video is found according to a kind of distributed node selection algorithm
Node.Different video replacement algorithms can be disposed on each FiWi node by master controller, such as least recently used
Strategy, most popular video strategy etc..
The present invention propose a kind of content distribution method under light and wireless FiWi converged network distributed caching method,
FiWi node device and content distribution system.It is connected between each FiWi node by fiber subnet in FiWi converged network, FiWi
Node and fiber subnet carry out centralized control by master controller, can be in communication with each other between FiWi node without via core
Net exchange, directly solves the problems, such as core network load pressure.By the way that the contents such as video are buffered in FiWi converged network respectively
In FiWi node on, the content caching inventory of each FiWi node there are master controller, as user terminal requests video not
In the current FiWi nodal cache of user's access, master controller passes through the overall situation to network topology and each nodal cache content
View by the lookup corresponding with video inventory of cache node address, and combines network link real-time status, according to minimal time delay and biography
Defeated cost principle finds the FiWi node for suitably caching the video, and does not have to intercourse caching letter with other FiWi nodes
Breath, to greatly reduce link overhead and time delay.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (6)
1. a kind of content distribution method, which is characterized in that this method comprises:
The cache contents on each FiWi node in light and wireless FiWi converged network；Wherein, it is cached on each FiWi node interior
Hold not exactly the same, content can be transmitted by optical fiber link between each FiWi node；When a current FiWi node receives nothing
When the content requests that the terminal device that line accesses the current FiWi node is sent:
If being cached with the content of user's request on current FiWi node, which requests the user of own cache
Content be sent to the terminal device；
If the content for not having cache user to request on current FiWi node, the current FiWi node are obtained from other FiWi nodes
The content of user's request is simultaneously sent to the terminal device；
Wherein, the terminal device in FiWi converged network is by being wirelessly connected to FiWi node to obtain corresponding contents；
If being cached with the content of user's request on the current FiWi node, the current FiWi node is by the user of own cache
The content of request is sent to the terminal device
After current FiWi node receives the content requests that the user sends, first judge in the flow table of itself with the presence or absence of with
The item of the content matching of family request；
The content that the user of own cache requests directly then is sent to the terminal device if there is occurrence；
Xiang Zexiang master controller if there is no match sends the content requests, receives master controller and redirects back
The flow table of content requests and the content about user request, the content that current FiWi node requests the user of own cache
It is sent to the terminal device.
2. if there the method for claim 1, wherein do not have cache user to request on the current FiWi node to be interior
Hold, which obtains the content of user's request and be sent to the terminal device from other FiWi nodes includes:
After current FiWi node receives the content requests that the user sends, first judge in the flow table of itself with the presence or absence of with
The item of the content matching of family request；
Item if there is no match, current FiWi node send the content requests to master controller, receive master controller
The content for the user request that other FiWi nodes of scheduling are sent by optical fiber link, and receive master controller and send
About the user request content flow table；The content that the user received requests is sent to institute by current FiWi node
State terminal device；
If there is occurrence, then the content requests that the user sends are redirected to accordingly by current FiWi node according to flow table
FiWi node, receive the content for the user request that the corresponding FiWi node is sent by optical fiber link, be sent to institute
State terminal device.
3. a kind of FiWi node device, which is characterized in that other FiWi in the FiWi node device and FiWi converged network are saved
Between point device content can be transmitted by optical fiber link；Terminal device in FiWi converged network is by being wirelessly connected to FiWi section
Point is to obtain corresponding contents；The FiWi node device includes:
Cache unit is used for cache contents；
Content distribution unit, the content requests that the terminal device for receiving the wireless access FiWi node device is sent；For
When being cached with the content of user's request in the cache unit, the content of user's request in cache unit is sent to described
Terminal device；When for not caching the content of user's request in the cache unit, from other FiWi node devices
It obtains the content of user's request and is sent to the terminal device；
When being cached with the content of user's request in the cache unit,
The content distribution unit, in the flow table for first judging itself after receiving the content requests that the user sends
With the presence or absence of the item for the content matching requested with user；If there is occurrence then directly by user's request in cache unit
Content is sent to the terminal device；Xiang Zexiang master controller if there is no match sends the content requests, in reception
Heart controller redirects the flow table of content requests back and the content about user request, by what is cached in cache unit
The content of user's request is sent to the terminal device.
4. FiWi node device as claimed in claim 3, which is characterized in that cache the use when no in the cache unit
When the content of family request,
The content distribution unit, in the flow table for first judging itself after receiving the content requests that the user sends
With the presence or absence of the item for the content matching requested with user；Item if there is no match sends the content to master controller and asks
It asks, receives the content that other FiWi nodes of master controller scheduling are requested by the user that optical fiber link is sent, and
The flow table for receiving the content about user request that master controller is sent, the content of the user received request is sent out
Give the terminal device；If there is occurrence, then the content requests that the user sends are redirected to by phase according to flow table
The FiWi node device answered receives the content for the user request that the corresponding FiWi node is sent by optical fiber link, and
It is sent to the terminal device.
5. a kind of content distribution system, which is characterized in that the system include: master controller in FiWi converged network and
Multiple FiWi node devices as described in any one of claim 3-4；
The content cached on each FiWi node device is not exactly the same, can be transmitted by optical fiber link between each FiWi node device
Content；
Master controller includes: storage unit and control processing unit；
The storage unit, for saving FiWi nodal cache inventory；It is wherein had recorded in FiWi nodal cache inventory each
The content cached on FiWi node device；
The control processing unit, for being saved according to FiWi after receiving the content requests that current FiWi node device is sent
Point cache inventory judges the content that user's request whether has been cached in the current FiWi node device；It is then by the user
The content requests of transmission are redirected to the current FiWi node device, and send to the current FiWi node device about the user
The flow table of the content of request；Otherwise other for being cached with the content of user's request have been searched according to FiWi nodal cache inventory
The content requests that the user sends, are redirected to the FiWi node device found out by FiWi node device, and to finding out
FiWi node device and the current FiWi node device send corresponding flow table respectively so that the FiWi node found out is set
The content of the standby user request by caching is sent to the current FiWi node device by optical fiber link, then current by this
FiWi node device is sent to terminal device.
6. system as claimed in claim 5, which is characterized in that
The control processing unit is cached with the user for having searched in the caching inventory uploaded according to all FiWi nodes
When other multiple FiWi node devices of the content of request, a FiWi is therefrom selected according to minimum transfer time delay and cost principle
The content requests that the user sends are redirected to the FiWi node device of selection, and saved to the FiWi of selection by node device
Point device and the current FiWi node device send corresponding flow table respectively.
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