CN105791392A - Mobile network based edge service communication method and system - Google Patents
Mobile network based edge service communication method and system Download PDFInfo
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- CN105791392A CN105791392A CN201610087849.6A CN201610087849A CN105791392A CN 105791392 A CN105791392 A CN 105791392A CN 201610087849 A CN201610087849 A CN 201610087849A CN 105791392 A CN105791392 A CN 105791392A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/2491—Mapping quality of service [QoS] requirements between different networks
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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
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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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
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
Abstract
The invention discloses a mobile network based edge service communication method and system. The mobile network based edge service communication method comprises the steps of, by a control node, analyzing a first request sent by a base station and searching a first storage node in a first preset storage node set based on the first request; if the first storage node is searched, sending a first response which includes the address of the first storage node to the base station; sending a second request which includes the first request to the first storage node based on the address of the first storage node by the base station; and sending a second response to the base station based on the second request by the first storage node. The position of a storage node where request content is stored can be obtained by pre-storing the storage node set in a control node, so that the specific deployment position of each storage node is unnecessary to consider, and each storage node can be deployed flexibly; meanwhile, as the request content is sent to the base station directly by each storage node, the data transmission time is reduced greatly, and the use experience is enhanced.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of edge service communication means based on mobile network and system.
Background technology
Along with the arrival in the Digital Services epoch being representative with application and content, data, services new in mobile communications network emerges in an endless stream, and covers user's demand for various aspects such as clothing, food, shelter, row, use.Mobile radio communication constitution is mainly based on the content class such as video, big file download in recent years.Owing to current content distributing network (CDN) node major deployments is at backbone network, therefore when facing big concurrent flow, mobile network will bear huge pressure, and cause extra time delay due to network congestion, thus Consumer's Experience will be affected further.Prediction according to Cisco, the 2.5EB/ month from 2014 is risen to the 24.3EB/ month of 2019 by following global mobile communication flow, and in 5 years, rate of increase reaches 972%, and this will give mobile communications network, especially connect the return network between Access Network and core net, bring huge pressure.Marketing research and advisory organization StrategyAnalytics research that the whole world is famous show, calculate with current mobile Internet flow growth rate, it is contemplated that will face the return network capacity breach of 16PB in global range in 2017.Operator needs significantly more efficient management and operation way badly.
Current mobile communications network introduces content distributing network (ContentDeliveryNetwork, CDN) technology and edge content cache node, inject content into distance users closer to base station/other mobile communications network network elements, increase the pressure to return network and core net alleviating flow, and promote Consumer's Experience.But, owing in mobile communications network, Internet user's data stream must with GRPS tunnel protocol (GPRSTunnellingProtocol, GTP) grouped data network gateway (PDNGateWay is converged to, PGW), forward at PGW, this makes inside mobile communications network, particularly at Mobile Access Network or return network, it is impossible to dispose content distributing network or content caching (cache) node as the Internet flexibly.In existing mobile CDN research/scheme, it is the core net that mobile CDN node has been deployed in mobile communications network mostly, way CDN node being deployed in mobile communication core net contributes to centralized administering and maintaining, and promote user's service experience to a certain extent, but do not have help for alleviating return link pressure.
Owing in mobile communications network, Internet user's data stream must converge to PGW with GRPS tunnel protocol, forward at PGW, this makes inside mobile communications network, particularly at Mobile Access Network or return network, IP exchange and route cannot be carried out as the Internet, therefore, it is difficult to dispose content distributing network or content caching (cache) node, i.e. memory node neatly；Simultaneously as mobile communication external network is shielding by the node location information within mobile network, namely traditional SiteServer LBS in internet C DN system is to learn that user is in the more specific location information within mobile communications network.Meanwhile, when memory node and mobile network's internal node communicate, it is necessary to through multiple nodes, when data volume is bigger, communication speed can be largely effected on, reduce customer experience.
Summary of the invention
Owing to mobile network's external node is shielding by the node in current mobile network, therefore cannot flexible deployment when disposing memory node, and traditional memory node communicates with the base station in mobile network and needs through multiple nodes, the problem largely effecting on communication speed when data volume is bigger, the present invention proposes a kind of edge service communication means based on mobile network and system.
First aspect, the present invention proposes a kind of edge service communication means based on mobile network, including:
Controlling node and resolve the first request that base station sends, ask to preset in memory node set first to search the first memory node according to described first, described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
The address according to described first memory node, the described base station, second request that sends is to described first memory node, and described second request comprises described first request；
Second response is sent to described base station by described first memory node according to described second request, and described second response is the request content of described first request.
Preferably, including:
If described control node is preset in memory node set first and do not found described first memory node, then described first request is sent to upper layer node；
Described upper layer node is preset in memory node set second and is searched the second memory node, and described second memory node has the request content of described first request, sends described first request to described second memory node；
3rd response is sent to described control node by described second memory node according to described first request, and described 3rd response is the request content of described first request；
Described 3rd response is sent to described base station by described control node.
Preferably, including:
If every node layer does not all find described second memory node, then described first request is sent to source station by top mode, and there is the request content of described first request described source station；
4th response is sent to described control node by described source station according to described first request, and described 4th response is the request content of described first request；
Described 4th response is sent to described base station by described control node.
Preferably, described 4th response is sent and includes after described base station by described control node:
Described control node selects the 3rd memory node according to resource scheduling algorithm, if described control node is preset in memory node set first does not find described first memory node, then described 3rd response is sent extremely described 3rd memory node and stores；
If every node layer does not all find described second memory node, then described 4th response is sent extremely described 3rd memory node and store.
Preferably, described control node resolves the first request that base station sends, and includes before first presets and search the first memory node in memory node set according to described first request:
Described base station receives the 3rd request that client sends, identify the destination address of described 3rd request, if the corresponding node of described destination address is for controlling node, then sending described first request to described control node according to GTP agreement, described first request includes base station information and described 3rd request.
Preferably, if the corresponding node of described destination address is memory node, then being sent described 4th request to this memory node by SGi interface, described 4th request comprises described 3rd request.
Second aspect, the present invention also proposes a kind of edge service communication system based on mobile network, including: control node, the first memory node and base station；
Described control node, for resolving the first request that base station sends, searches the first memory node according to described first request in the first default memory node set, and described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
Described base station is for the address according to described first memory node, and second request that sends is to described first memory node, and described second request comprises described first request；
Described first memory node is for sending the second response to described base station according to described second request, and described second response is the request content of described first request.
Preferably, also including the second memory node, described control node also includes upper layer node；
If described control node is additionally operable to judge that described control node is preset in memory node set first and does not find described first memory node, then described first request is sent to upper layer node；
Described upper layer node searches the second memory node for presetting in memory node set second, and described second memory node has the request content of described first request, sends described first request to described second memory node；
Described second memory node is for sending the 3rd response to described control node according to described first request, and described 3rd response is the request content of described first request；
Described control node is additionally operable to send to described base station described 3rd response.
Preferably, described first memory node adopts distributed deployment mode or centralized deployment mode.
Preferably, if double netcard is supported in described base station, then described first memory node and described base station are directly connected to.
As shown from the above technical solution, by the memory node set that prestores in controlling node, it is possible to obtain the memory node position having request content, it is not necessary to consider the concrete deployed position of memory node, enabling flexible deployment memory node；Directly request content is sent to base station by memory node simultaneously, greatly reduce data transmission period, enhance Consumer's Experience.Network function virtualization (the NetworkFunctionVirtualization of simultaneously compatible and open Mobile Access Network, NFV) with software definition (SoftwareDefinedx, SDx) function, supports edge service system that application drives, intelligence management and control.For example, it is possible to bypass mode realizes servicing towards the mobile CDN edge content of LTE-A and 5G；The machine communication edge service of LTE-A and 5G, car networking (V2X) edge service, virtual reality (VR) and augmented reality (AR) edge service etc. can be supported.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these figure.
The schematic flow sheet of a kind of edge service communication means based on mobile network that Fig. 1 provides for one embodiment of the invention；
The structure chart of the distributed edge services communication system of a kind of Single NIC base station based on mobile network that Fig. 2 provides for one embodiment of the invention；
The structure chart of the distributed edge services communication system of a kind of double netcard base station based on mobile network that Fig. 3 provides for one embodiment of the invention；
The structure chart of the centralized edge service communication system of a kind of Single NIC base station based on mobile network that Fig. 4 provides for one embodiment of the invention；
The structure chart of the centralized edge service communication system of a kind of double netcard base station based on mobile network that Fig. 5 provides for one embodiment of the invention；
A kind of system protocol stack schematic diagram communicated based on enhancing base station and the iCN of mobile network that Fig. 6 provides for one embodiment of the invention；
Fig. 7 strengthens the protocol stack schematic diagram of base station for a kind of Single NIC based on mobile network that one embodiment of the invention provides；
Fig. 8 strengthens the protocol stack schematic diagram of base station for a kind of double netcard based on mobile network that one embodiment of the invention provides；
A kind of protocol stack schematic diagram communicated with iCHE based on the enhancing base station of mobile network that Fig. 9 provides for one embodiment of the invention；
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of invention is further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Existing based on, in the communication system of mobile network, mainly having following several ways:
The mode of user's request is obtained, it is possible to mobile content is distributed Networking Solutions & provisioned and is divided into concatenation and the mode of shunting according to content caching node.Wherein, the mode of concatenation is by concatenating content node in the mobile communication network, by all flows flowing through content node being intercepted and captured and extracted Client-initiated request and user being serviced.The mode of shunting utilizes adds filter in intrinsic network element (such as eNB), particular flow rate led in CDN system.In other words, shunting is to utilize existing network element (such as eNB) to complete to intercept and capture function, and eNB inherently needs all flows are processed, and shunting simply adds a step in these process.Concatenation is then all flows are processed by concatenating new network element in a network.
In the scheme using tandem, distributed mobile management (DMM) based on IETF is operated in 3GPPLTE cellular network application scenarios and devises a gateway D-GW that can be used for flow unloading, and selects to be serially connected between wireless access network and S-GW D-GW.Or take similar deployment way, designed CGW is serially connected between eNB and S-GW, surveys (PacketInspection) by detective and extract particular flow rate.On rear side of these gateways or On-premise cache node the request of user can be intercepted and captured and user is serviced.It is pointed out that the deployment way using concatenation needs flows all on link are monitored and analyzed, this can cause extra expense.Meanwhile, the way of concatenation is also possible to bring new equipment Risk point.If therefore selecting the way of concatenation to need the realization of safety is additionally paid attention to.
In the scheme using shunting, can by the characteristic of 3GPP SIPTO (SelectedIPTrafficOffload) technology proposed.SIPTO technology is the technology proposed in 3GPPRelease10, is used primarily in macro network and disposes gateway device so that specific flow can at distance users closer proximity accessing external network.And in TS36.300 the proposition of SIPTOLN (SIPTOattheLocalNetwork) further the position (position of gateway device) that flow unloads has been sunk to mobile communications network edge even integrated in eNB so that structure more flattening, the data of user can from geography/logic closer to node carry out flow unloading.It may be noted that, by ins and outs relevant for SIPTO responsible for 3GPP system architecture working group (SA2) still among discussing, not yet form standard.Therefore, need relevant details is carried out appropriate design and realization based on this technology when applying.
In the scheme of SIPTO, the position of the gateway for unloading for flow, can select integrated in the enb, now need eNB other network elements (such as MME) in network to provide SIPTO to support accordingly, also need to realize simultaneously S5 interface for communicate and realize SGi interface between S-GW for being connected external network.In addition, can also select using gateway as a stand-alone network elements by bypass mode be connected on eNB after, under this deployment way, it is necessary to transmit the relevant information of SIPTO between eNB to other network elements (such as MME), also need to the interface between eNB and L-GW is realized simultaneously.The definition of this interface still under discussion, needs it is carried out appropriate design and realization when using this kind of deployment way.
Whether use the mode of shunting/concatenation, be required for classifying IP stream to distinguish the IP stream of needs unloading.The method generally adopted is by 1 in source/destination address, source/destination port number and protocol type 5 or multinomial be identified.Such as, a kind of IP based on entropy flows mode classification, or use a kind of IP based on fast Fourier transform of scene research of SIPTO to flow categorizing system for H (e) NB, or unload scheme and for traditional traffic filtering scheme, based on the scheme of DNS and comprehensive DNS and many APN scheme based on the SIPTO flow of DNS.
Fig. 1 illustrates a kind of edge service communication means based on mobile network that one embodiment of the invention provides, including:
S101, control node resolve the first request that base station sends, and search the first memory node according to described first request in the first default memory node set, and described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
S102, the address according to described first memory node, the described base station, second request that sends is to described first memory node, and described second request comprises described first request；
Second response is sent to described base station by S103, described first memory node according to described second request, and described second response is the request content of described first request.
Wherein, described first memory node is located at inside mobile network, for the fringe node of mobile network.
The present embodiment is by the memory node set that prestores in controlling node, it is possible to obtain the memory node position having request content, it is not necessary to consider the concrete deployed position of memory node, enabling flexible deployment memory node；Directly request content is sent to base station by memory node simultaneously, greatly reduce data transmission period, enhance Consumer's Experience.
As the preferred version of the present embodiment, also include:
If S201 described control node is preset in memory node set first and do not found described first memory node, then described first request is sent to upper layer node；
S202, described upper layer node are preset in memory node set second and are searched the second memory node, and described second memory node has the request content of described first request, send described first request to described second memory node；
3rd response is sent to described control node by S203, described second memory node according to described first request, and described 3rd response is the request content of described first request；
Described 3rd response is sent to described base station by S204, described control node.
Wherein, described second memory node is located at inside mobile network, for the fringe node of mobile network.
When in the request content not memory node in current mobile network, and time in the memory node beyond mobile network, by successively finding the memory node at request content place, and request content is sent to controlling node, be forwarded to base station by controlling node.By controlling node, can quickly position the node location within mobile network, request content is sent to controlling node, it is forwarded to base station by control node simultaneously, directly request content is sent the mode to base station compared to the memory node outside mobile network, faster, Consumer's Experience is better for transmission speed.
Further, including:
If the every node layer of S301 does not all find described second memory node, then described first request is sent to source station by top mode, and there is the request content of described first request described source station；
4th response is sent to described control node by S302, described source station according to described first request, and described 4th response is the request content of described first request；
Described 4th response is sent to described base station by S303, described control node.
When in the request content not memory node in current mobile network, time also not in memory node beyond mobile network, the source station having request content request content is sent to controlling node, be forwarded to base station by controlling node.By controlling node, it is possible to quickly location node location within mobile network, request content is sent to controlling node, it is forwarded to base station by control node simultaneously, directly request content being sent the mode to base station compared to by source station, faster, Consumer's Experience is better for transmission speed.
Further, include after step S303:
S304, described control node select the 3rd memory node according to resource scheduling algorithm, if described control node is preset in memory node set first does not find described first memory node, then described 3rd response is sent extremely described 3rd memory node and store；
If the every node layer of S305 does not all find described second memory node, then described 4th response is sent extremely described 3rd memory node and store.
Wherein, described 3rd memory node is located at inside mobile network, for the fringe node of mobile network.
Mobile network's content can be found to be best suitable for the memory node of storage request content by resource scheduling algorithm, request content is stored in this memory node, if current mobile network needs this request content, it is possible to quickly respond, be greatly promoted Consumer's Experience.
Specifically, include before step S101:
S100, described base station receive the 3rd request that client sends, identify the destination address of described 3rd request, if the corresponding node of described destination address is for controlling node, then sending described first request to described control node according to GTP agreement, described first request includes base station information and described 3rd request.
Request client sent by base station is identified, it is possible to send this request to controlling node exactly, so that controlling node can find the memory node comprising request content quickly and accurately.
Further, if the corresponding node of described destination address is memory node, then being sent described 4th request to this memory node by SGi interface, described 4th request comprises described 3rd request.
By SGi interface, it is possible to packet is further processed, for transmission in different networks.
In order to illustrate in greater detail the communication means that this enforcement provides, below the workflow of system is illustrated:
A1, mobile client initiate content requests, and content requests is redirected to iCHE node by a series of CDN normal processs.Redirect flow process specifically, including:
Mobile client is to source station request content, and source station uses 302 instructions that client's request is redirected to GSLB-HTTP；
Client is to GSLB-HTTP request content, and GSLB-HTTP, according to scheduling strategy, uses 302 instructions that client's request is redirected to iCHE node again；
A2, iCHE node receives client content request, carries out local search.If local hit, then iCHE node selects suitable content node iCN, uses 302 instructions that client's request is redirected to this iCN, performs A3 step afterwards.Otherwise perform A6 step.Wherein, the selection mode of iCN node can be used but not limited to following methods:
If requested content is merely stored in some iCN node, this iCN node is selected to service
If requested content is on multiple iCN nodes, the iCN node selecting the suitable all iCN node links of load in the best state services.Tolerance for " load is suitable " can be used but not limited to following manner: iCN node concurrent services quantity is less than the upper limit；ICN node is currently able to meet the qos requirement (such as bandwidth requirement etc.) of service.
The address that destination address is certain iCN, after receiving the request message of client, is identified in A3, base station, uses SGi protocol format to be packaged and issues the iCN of correspondence from suitable port.Specifically.
Content-data packet filtering in base station and diverter module have the IP address information of iCHE node.When base station receives the packet that client sends, the destination address of packet is judged, if the IP address that destination address is iCHE node, then it is assumed that this packet is Target IP packet, and can be further processed；If the IP address that destination address is iCN node, then correspondingly process.
For Single NIC deployment scenario, iCN node is connected to the router/switch that base station is direct-connected, the packet mailing to iCN forwards from the same interface strengthening base station with the packet mailing to SGW, and the packet mailing to iCN node mails to target iCN node by the router/switch of mobile edge network.
For the scene that double netcard is disposed, there is direct connected link between iCN node and enhancing base station, packet is mail to the network at iCN node place by the packet mailing to iCN node by these interfaces, and finally these packets arrive target iCN node.
When using SGi protocol form to communicate between iCN and enhancing base station, strengthen base station and send packet to iCN, strengthen mark in the carrying that packet is subordinate to by base station and strengthen the TEID Information encapsulation correct position (added field such as IP packet header) at SGi packet of base station side.After iCN receives this packet, TEID information is extracted.
A4, target iCN receive content requests, after carrying out respective handling, send content to user.Specifically
ICN node and mobile edge network being shared to the deployment scenario of same set of physical link, iCN node is connected to the router/switch that base station is direct-connected, mails to the packet strengthening base station and mails to enhancing base station by the router/switch of mobile edge network.
ICN node disjoint is connected to the scene strengthening base station deployment, iCN node is not take up the physical link resource of mobile edge network, iCN node is directly connected on the interface strengthening base station, mails to the packet strengthening base station and is sent by these interfaces, and finally these packets arrive user.
For the scene using SGi protocol form to communicate between iCN and enhancing base station, iCN node is encapsulated in the correct position (Optional Field such as IP packet header) of packet header according to the corresponding information (such as TEID) in the packet received, and is sent to client.
A5, client place base station receive content message, after message is performed corresponding process, perform the standard operation of base station and issue client by air interface, service terminates.Specifically:
ICN node and mobile edge network being shared to the deployment scenario of same set of physical link, iCN node is connected to the router/switch that base station is direct-connected.The bag that base station receives is probably the SGW bag sent and is also likely to be the packet that iCN node sends.Can be used but not limited to following method packet is identified: safeguarding the IP address list having each iCN in a base station, base station is by judging packet source address, if source address is in the list, then packet is the packet that iCN node sends.
Being connected to for iCN node disjoint and strengthen the deployment scenario gone to the station to meet somebody, edge C DN system is not take up the physical link resource of mobile edge network, and iCN node is directly connected on the interface of base station.Directly from physical interface, two kinds of packets (packet that iCN node sends and the SGW packet sent) are made a distinction.
For the scene using SGi protocol form to communicate between iCN and enhancing base station.When strengthening base station to iCN transmission packet, strengthen mark in the carrying that packet is subordinate to by base station and strengthen the TEID Information encapsulation correct position (added field such as IP packet header) at SGi packet of base station side.After iCN receives this packet, TEID information is extracted and is encapsulated in the correct position (added field such as IP packet header) of SGi packet, and the packet (packet header is followed successively by IP, UDP/TCP, APP from outside to inside) after processing is issued enhancing base station.And enable normal process to process after packet (packet header is followed successively by IP, UDP, GTP-U, IP, TCP/UDP, APP from outside to inside) process.
A6, iCHE perform the CDN flow process of standard and obtain object content and send content to user.Specifically, comprise the following steps:
ICHE node obtains object content to upper level CDN node, if upper level CDN node comprises object content, then content is returned.If upper level CDN node is without object content, then to the node request content of upper level again, by that analogy.
If the CDN node of top layer is still without object content, then to source station acquisition content and returned to iCHE node by the CDN node of top layer successively.
ICHE node performs resource scheduling algorithm, decides whether to store this content, and via P-GW, content is sent to user.
Wherein, in order to alleviate the burden of iCHE, step A6 can also adopt A6 ' step:
Request is redirected to upper level CDN node by A6 ', iCHE, remembers that this node is CDNi, and is responsible for user is carried out content service by this node.Specifically include following steps:
If current CDN node has object content, then content is returned；Otherwise to upper level CDN node request content.
Repeat step A1, until obtaining requested interior perhaps until one-level CDN is still without object content.If one-level CDN is without object content, then obtains content to source station and return
Content returns to CDNi successively, and directly content is returned to client by CDNi node.
The communication means of the present embodiment is compared with the CDN node scheme being deployed in outside core net/mobile network, and mobile CDN node is sunk further, it is possible to alleviate return network pressure, promotes user's service experience；And it is directly integrated in base station by tapping with Unload module; CDN local content service request guiding movement CDN node will be moved by the mode of pure IP exchange with route; can effectively solve the existing network cache node that accesses at present to need to be serially connected with communication link; content service is provided the user by intercepting and capturing user face data bag the mode as content server agency; protecting more excellent for privacy of user, the impact that mobile communication system is caused is little.
Fig. 2 illustrates a kind of edge service communication system based on mobile network that the present embodiment provides, including: control node the 21, first memory node 22 and base station 23；
Wherein, controlling node 21 is iCHE, and the first memory node 22 is iCH.
Described control node, for resolving the first request that base station sends, searches the first memory node according to described first request in the first default memory node set, and described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
Described base station is for the address according to described first memory node, and second request that sends is to described first memory node, and described second request comprises described first request；
Described first memory node is for sending the second response to described base station according to described second request, and described second response is the request content of described first request.
The present embodiment is by the memory node set that prestores in controlling node, it is possible to obtain the memory node position having request content, it is not necessary to consider the concrete deployed position of memory node, enabling flexible deployment memory node；Directly request content is sent to base station by memory node simultaneously, greatly reduce data transmission period, enhance Consumer's Experience.
As the preferred version of the present embodiment, also including the second memory node, described control node also includes upper layer node；
If described control node is additionally operable to judge that described control node is preset in memory node set first and does not find described first memory node, then described first request is sent to upper layer node；
Described upper layer node searches the second memory node for presetting in memory node set second, and described second memory node has the request content of described first request, sends described first request to described second memory node；
Described second memory node is for sending the 3rd response to described control node according to described first request, and described 3rd response is the request content of described first request；
Described control node is additionally operable to send to described base station described 3rd response.
When in the request content not memory node in current mobile network, and time in the memory node beyond mobile network, by successively finding the memory node at request content place, and request content is sent to controlling node, be forwarded to base station by controlling node.By controlling node, can quickly position the node location within mobile network, request content is sent to controlling node, it is forwarded to base station by control node simultaneously, directly request content is sent the mode to base station compared to the memory node outside mobile network, faster, Consumer's Experience is better for transmission speed.
The outside of mobile network refers to PDN Gateway (PDNGateWay, P-GW) as separation, and P-GW is connected, with route, the outside that side is mobile network；As in figure 2 it is shown, iCN is mobile CDN memory node (in-RANCDNNode is called for short iCN), iCHE controls node (in-RANCDNHandlingEntity is called for short iCHE) for mobile CDN.The inside of mobile network refers to P-GW for separation, and P-GW and gateway (ServingGateWay, S-GW) connect the inside that side is mobile network.
Further, described first memory node adopts distributed deployment mode or centralized deployment mode.
When memory node is adopted distributed deployment mode, connecting different memory nodes by return network, when request content is when the memory node that current base station is corresponding, its transmission speed will be very fast.To memory node adopt centralized deployment mode time, all of memory node interconnect, when request content is not when the memory node that current base station is corresponding, compared to distributed deployment mode transmission speed faster.
Further, if double netcard is supported in described base station, then described first memory node and described base station are directly connected to.
By memory node and base station are directly connected to, it is possible to speeding up data transmission speed.
The structure chart of the respectively centralized communication system of the structure chart of the centralized communication system of the structure chart of distributed edge node communication system of double netcard base station, Single NIC base station and double netcard base station as shown in Figure 2-5.
At the present embodiment based in the communication system of mobile network, including following 3 key components: mobile CDN controls node i CHE (in-RANCDNHandlingEntity), mobile CDN memory node iCN (in-RANCDNNode) and enhancing base station.Wherein iCHE node is the internet C DN node closing on mobile network, is also the control node of each iCN node, is deployed on rear side of P-GW by the mode bypassed.ICN node is the mobile CDN node being deployed in mobile network edge.Communicated by the mode outside being with between iCN node and iCHE node.Strengthen base station and will increase content-data packet filtering and diverter module.Double netcard whether is supported and the need of concentrating deployment iCN node that deployment scenario is divided into 4 kinds, as Figure 2-Figure 5 according to base station.
Hereinafter iCHE node, iCN node and base station are described in detail respectively:
(1) iCHE node
ICHE node is local CDN node, is also the control node of each iCN node.ICHE node is deployed on rear side of P-GW by the mode bypassed, as Figure 2-Figure 5.ICHE can configure and directly store content-data or directly do not store content-data, it must safeguard the global information of each iCN node, including but not limited to information such as the load information of the position of the content information index information in each iCN node, each iCN node and base station and IP address information, link-state information and iCN node, the base stations at user place that services.The acquisition mode of these global informations is including but not limited to following several approach:
The acquisition of the content information index information in iCN node can be used but not limited to following manner: for needing the content of buffer memory, iCHE node can specify an iCN node that this content is stored, and simultaneously the related information of this content with corresponding iCN will be recorded by iCHE.
ICN node and the information such as the positional information of base station, IP address information belong to static information, configure at the system deployment initial stage.
The acquisition mode of link-state information and iCN node load information can be used but not limited to following manner: iCN node periodically sends RTT test packet to accessibility base station, according to Link State being estimated from initiating request to the time span receiving response.And periodically the load information of link-state information Yu iCN node is sent to iCHE node by the mode of out-of-band communication, the related description of iCN node is refer to about the description of out-of-band communication.
The acquisition of the base station information at the user place serviced can be used but not limited to following manner: base station position information is injected in base station after receiving user and initiating, to iCHE node, the packet asked in IP packet.ICHE extracts the IP address information of base station after receiving request data package in packet and thus obtains the positional information of base station.Wherein:
The identification of data packets mode that user is initiated request to iCHE node by base station can be used but not limited to following manner: strengthens the IP address information having iCHE node in base station in content-data packet filtering and diverter module.When base station receives the packet of user, the destination address of packet is judged, if the IP address that destination address is iCHE node, then it is assumed that this packet is Target IP packet.
The positional information of base station is required to uniquely identify the position of base station, it is possible to but it is not limited to following several ways: and the ip address of base station, base station IDs, the iCN node i p address that distance base station is nearest, the iCN node ID that distance base station is nearest.
Can there be multiple choices the position that the positional information of base station injects, can be used but not limited in the following manner: use the position of the IP address designation base station of base station, IP packet header enables " route record " in option, and this IP address information is injected in this option corresponding field.
The function of iCHE node include but not limited to following some:
For the CDN system in the Internet, iCHE node can be regarded as the fringe node of CDN system, completes the affairs of CDN system fringe node, includes but not limited to that content propelling movement process, content update process.
For terminal use, it is that each user asks one suitable service object of distribution to service that iCHE node performs dispatching algorithm.Service object herein includes the iCHE all iCN nodes managed in mobile radio communication inside, and iCHE is in the upper strata CDN node outside mobile radio communication.
For each iCN node, iCHE node is the control node of each iCN node.The content controlled includes but not limited to: for the upper strata CDN content pushed, iCHE node can select suitable iCN node to store；Asking for Client-initiated, iCHE is responsible for performing dispatching algorithm and assigns suitable iCN node to service according to the request of user.The selection mode of iCN node can be used but not limited to following methods:
If requested content is merely stored in some iCN node, this iCN node is selected to service；
If requested content is on multiple iCN nodes, the iCN node selecting the suitable all iCN node links of load in the best state services.Tolerance for " load is suitable " can be used but not limited to following manner: iCN node concurrent services quantity is less than the upper limit；ICN node is currently able to meet the qos requirement (such as bandwidth requirement etc.) of service.
(2) iCN node
ICN node is the CDN node being deployed in mobile network edge.
ICN is deployed on rear side of enhancing base station by the mode bypassed.Namely the switch/router being connected with enhancing base station in iCN connection.
ICN node can use the mode of distributed deployment, it is possible to use concentrates the mode disposed.Specifically, iCN node being used to the scene of distributed deployment, as shown in Figure 2 and Figure 3, each iCN node accesses mobile edge network by the router/switch direct-connected with strengthening base station, utilizes mobile edge network and return network physical link to communicate.Independent resource is used to concentrate the mode (as Suo Shi Fig. 4, Fig. 5) disposed for iCN node, such as the deployment scenario of large-scale garden or office building.For these scenes.Can be undertaken all of iCN node concentrating and dispose.ICN node now can be entity iCN node, is connected with each other by physical link each other, it is also possible to be virtualization node (viCN), uses the mode of such as virtual machine to dispose.
Whether the link accessed between route overlaps and is divided into Single NIC and two kinds of scenes of double netcard with it according to the link between iCN with base station and base station for iCN node and the communication mode between base station.Specifically, scene (as shown in Figure 2, Figure 4 shows) for Single NIC, iCN node is connected with the router/switch being directly connected to base station, the packet that iCN node sends is forwarded to base station via router, and by the packet filtering in base station and diverter module, packet is processed and forwarded to user.For the scene (as shown in Fig. 3, Fig. 5) of double netcard, the separate port that iCN node also needs to base station is connected, and the packet by physical port, iCN node sent in enhancing base station side is made a distinction with the S-GW packet sent.
The data packet format that iCN node and enhancing inter base station communication use is for being SGi protocol format.Specifically: when using SGi protocol form to communicate between iCN and enhancing base station (as shown in Figure 6), mail to the packet of iCN for strengthening base station, strengthen mark in the carrying that packet is subordinate to by base station and strengthen the TEID Information encapsulation correct position (added field such as IP packet header) at SGi packet of base station side.After iCN receives this packet, TEID information is extracted.ICN is mail to the packet strengthening base station, iCN is by correct position (added field such as IP packet header) at SGi packet of the TEID Information encapsulation that receives, and the packet (packet header is followed successively by IP, UDP/TCP, APP from outside to inside) after processing is issued enhancing base station.After enhancing base station receives this packet, it is that SGi packet stamps S1 packet header according to TEID information.And use the flow process of base station standard to process the packet (packet header is followed successively by IP, UDP, GTP-U, IP, TCP/UDP, APP from outside to inside) after processing.
Link-state information and load information are periodically sent to iCHE node by iCN node, and meanwhile, iCHE node can assign control instruction and content-data aperiodically to iCN node.These control instructions include but not limited to: content storage, content are replaced, content update.
The communication mode of iCN node and iCHE node uses out-of-band communication, namely with mobile network sharing physical link resource；The implementation of out-of-band communication, it is possible to use the following method of (but not limited to): for using the mobile communications network of optical fiber, multiple interface, total interface multiplexing same physical transmission link can be drawn in an optical cable.Therefore several interface therein can be utilized for transmitting the internodal out of band data of iCN and iCHE, thus getting around other network elements in mobile communications network.
(3) base station is strengthened
Enhancing base station in the present embodiment, is different from traditional base station part and is in that wherein to comprise a content-data packet filtering and diverter module.This module unloads with the internodal flow of iCN with to user.It is different from the 3GPP SIPTO/LIPA flow discharging method part proposed and is in that: whether SIPTO technology or LIPA technology all still under discussion, not yet form concrete technical scheme.
SIPTO/LIPA connection establishment/release flow process is complicated, user is needed to use APN or specific packet that near-end gateway is adhered to, and the flow unloading service for user in the present invention is transparent, flow process is also more simple, it is not necessary to gateway is adhered to by user.
Flow is unloaded to outer net by SIPTO/LIPA, it is necessary to complete and the docking of outer net by local gateway (L-GW), and L-GW can be regarded as the P-GW simplifying version, but remains a need for realizing the function of relative complex, such as fire wall, the distribution of IP address.And move CDN system in the present invention and need not be at outer net, can be regarded as mobile communications network an extension subsystem, flow unloading corresponding in the present embodiment is not unloaded to outside system, but flowed to the ad-hoc location in system, do not need the function such as fire wall, the distribution of IP address, it is achieved more simple.
Strengthening the protocol stack diagram of base station as shown in Figure 7 and Figure 8, the flow unloading step of its correspondence is as follows:
For strengthening the bag sent from user side that base station receives, base station performs following steps:
Packet is identified by the content-data packet filtering strengthening base station with diverter module, if this packet is the packet mailing to certain iCN node, then performs second step；If this packet is the packet mailing to iCHE node, then perform the 3rd step；Otherwise packet is carried out transparent transmission.Specifically: packet, after receiving the packet of user, can be packaged by base station.The principle of base station side identification bag is as follows: safeguard the IP address list having each iCN and iCHE in a base station, if the destination address of the packet of discovery user is in the list, then identifies this packets need and carries out special handling.
For mailing to the packet of iCN node, mail to suitable interface with SGi form, be then transmitted to target iCN node.Specifically: for the deployment scenario (as shown in Figure 2, Figure 4 shows) of Single NIC, iCN node is connected to the router/switch that base station is direct-connected.The packet mailing to iCN forwards from the same interface strengthening base station with the packet mailing to SGW.Enhancing base station protocol stack figure under this scene is as shown in Figure 7.
Scene (as shown in Fig. 3, Fig. 5) for the deployment of double netcard, direct connected link is had between iCN joint and enhancing base station, packet is mail to the network at iCN node place by base station by mailing to the packet of iCN node by the interface of these direct connected links, and finally these packets arrive target iCN node.Enhancing base station protocol stack figure under this scene is as shown in Figure 8.
For the scene using SGi protocol form to communicate between iCN and enhancing base station, when strengthening base station to iCN transmission packet, strengthen mark in the carrying that packet is subordinate to by base station and strengthen the TEID Information encapsulation correct position (added field such as IP packet header) at SGi packet of base station side.After iCN receives this packet, TEID information is extracted.Enhancing base station protocol stack figure under this scene is as shown in FIG. 7 and 8.
For mailing to the packet of iCHE node, it is necessary to by position suitable in the information injecting data bag of base station, the option field in IP packet header.ICHE node is mail to afterwards by the GTP agreement flow process of standard.Under this scene, system protocol stack figure is as shown in Figure 9.
Base station information is for notifying that iCHE node initiates the customer location of request, and the position based on user is selected suitable iCN node that user is serviced by iCHE node.The selection mode of iCN node be refer to the explanation in iCHE node by iCHE node.
Base station information is for being identified the position of base station, it is possible to selects but is not limited to: the IP address of base station, base station IDs, the iCN node IP address nearest from base station.
For the packet mailing to user that base station receives, base station performs following steps:
The packet mailing to user is identified by base station.Specifically
For the deployment scenario (as shown in Figure 2, Figure 4 shows) of Single NIC, iCN node is connected to the router/switch that base station is direct-connected.The bag that base station receives is probably the SGW bag sent and is also likely to be the packet that iCN node sends.Can be used but not limited to following method packet is identified: safeguarding the IP address list having each iCN in a base station, base station is by judging packet source address, if source address is in the list, then packet is the packet that iCN node sends.Protocol stack diagram now is as shown in Figure 7.
For the scene (as shown in Fig. 3, Fig. 5) of double netcard, between iCN node and enhancing base station, there is direct connected link.Directly from physical interface, two kinds of packets (packet that iCN node sends and the SGW packet sent) are made a distinction.Protocol stack diagram now is as shown in Figure 8.
For the SGW packet sent, base station uses standard GTP handling process that packet is processed and forwarded to user.For the IP packet sent from iCN, after packet encapsulation is become by base station and enable normal process and packet is processed and is transmitted to user by air interface.Specifically: between iCN and enhancing base station, use SGi protocol form to communicate, when strengthening base station to iCN transmission packet, strengthen mark in the carrying that packet is subordinate to by base station and strengthen the TEID Information encapsulation correct position (added field such as IP packet header) at SGi packet of base station side.After iCN receives this packet, TEID information is extracted and is encapsulated in the correct position (added field such as IP packet header) of SGi packet, and the packet (packet header is followed successively by IP, UDP/TCP, APP from outside to inside) after processing is issued enhancing base station.And enable normal process to process after packet (packet header is followed successively by IP, UDP, GTP-U, IP, TCP/UDP, APP from outside to inside) process.As shown in Figure 7 and Figure 8.
In the description of the present invention, describe a large amount of detail.It is to be appreciated, however, that embodiments of the invention can be put into practice when not having these details.In some instances, known method, structure and technology it are not shown specifically, in order to do not obscure the understanding of this description.
Claims (10)
1. the edge service communication means based on mobile network, it is characterised in that including:
Controlling node and resolve the first request that base station sends, ask to preset in memory node set first to search the first memory node according to described first, described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
The address according to described first memory node, the described base station, second request that sends is to described first memory node, and described second request comprises described first request；
Second response is sent to described base station by described first memory node according to described second request, and described second response is the request content of described first request.
2. method according to claim 1, it is characterised in that including:
If described control node is preset in memory node set first and do not found described first memory node, then described first request is sent to upper layer node；
Described upper layer node is preset in memory node set second and is searched the second memory node, and described second memory node has the request content of described first request, sends described first request to described second memory node；
3rd response is sent to described control node by described second memory node according to described first request, and described 3rd response is the request content of described first request；
Described 3rd response is sent to described base station by described control node.
3. method according to claim 2, it is characterised in that including:
If every node layer does not all find described second memory node, then described first request is sent to source station by top mode, and there is the request content of described first request described source station；
4th response is sent to described control node by described source station according to described first request, and described 4th response is the request content of described first request；
Described 4th response is sent to described base station by described control node.
4. method according to claim 3, it is characterised in that described 4th response is sent and includes after described base station by described control node:
Described control node selects the 3rd memory node according to resource scheduling algorithm, if described control node is preset in memory node set first does not find described first memory node, then described 3rd response is sent extremely described 3rd memory node and stores；
If every node layer does not all find described second memory node, then described 4th response is sent extremely described 3rd memory node and store.
5. method according to claim 4, it is characterised in that described control node resolves the first request that base station sends, included before first presets and search the first memory node in memory node set according to described first request:
Described base station receives the 3rd request that client sends, identify the destination address of described 3rd request, if the corresponding node of described destination address is for controlling node, then sending described first request to described control node according to GTP agreement, described first request includes base station information and described 3rd request.
6. method according to claim 5, it is characterised in that if the corresponding node of described destination address is memory node, then sent described 4th request to this memory node by SGi interface, and described 4th request comprises described 3rd request.
7. the edge service communication system based on mobile network, it is characterised in that including: control node, the first memory node and base station；
Described control node, for resolving the first request that base station sends, searches the first memory node according to described first request in the first default memory node set, and described first memory node has the request content of described first request；If finding, then sending the first response to described base station, described first respond packet is containing the address of described first memory node；
Described base station is for the address according to described first memory node, and second request that sends is to described first memory node, and described second request comprises described first request；
Described first memory node is for sending the second response to described base station according to described second request, and described second response is the request content of described first request.
8. system according to claim 7, it is characterised in that also including the second memory node, described control node also includes upper layer node；
If described control node is additionally operable to judge that described control node is preset in memory node set first and does not find described first memory node, then described first request is sent to upper layer node；
Described upper layer node searches the second memory node for presetting in memory node set second, and described second memory node has the request content of described first request, sends described first request to described second memory node；
Described second memory node is for sending the 3rd response to described control node according to described first request, and described 3rd response is the request content of described first request；
Described control node is additionally operable to send to described base station described 3rd response.
9. system according to claim 8, it is characterised in that described first memory node adopts distributed deployment mode or centralized deployment mode.
10. system according to claim 9, it is characterised in that if double netcard is supported in described base station, then described first memory node and described base station are directly connected to.
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