CN108200206B - ICN seamless mobile system based on SDN framework - Google Patents
ICN seamless mobile system based on SDN framework Download PDFInfo
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- CN108200206B CN108200206B CN201810130179.0A CN201810130179A CN108200206B CN 108200206 B CN108200206 B CN 108200206B CN 201810130179 A CN201810130179 A CN 201810130179A CN 108200206 B CN108200206 B CN 108200206B
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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
- H04L49/00—Packet switching elements
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
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- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses an ICN seamless mobile system based on an SDN framework, wherein mobile terminals carried by a producer and a consumer are correspondingly marked as a first mobile terminal and a second mobile terminal; when the first mobile terminal or the second mobile terminal moves and switches the access point, the edge switch corresponding to the new access point cannot match the corresponding ID, so that the edge switch is forwarded to the POF controller, the POF controller cooperates with the session management module and/or the content management module to determine session information, and a path is re-planned to send a flow table; and then, the first mobile terminal matches the mobile identification bits according to the received request and returns the content cached in the mobile switching process of the first mobile terminal or the second mobile terminal, and the second mobile terminal processes the received content according to the sequence number of the content data block. Seamless mobility is achieved through the system, allowing the user to recover data lost due to the mobility handoff process as desired.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an ICN seamless mobile system based on an SDN framework.
Background
With the popularization of network applications in the production and living fields, the internet has become an important cornerstone for economic and social development. The rise of broadband networks, and in particular the mobile internet, has led to a explosive growth in the demand for online content access by users. Meanwhile, the 4G network adopted at the present stage is replaced by a more advanced 5G network in predictability. However, the initial design of the internet is mainly to support Host-to-Host communication, that is, communication between hosts, and when massive content is distributed and transmitted, the IP peer-to-peer communication mode centering on the Host address exposes limitations in terms of resource allocation, security, manageability and controllability, particularly, quality of service, and the like. Because of the core status of content in internet applications, a new internet network structure with content as the center is developed, and the existing research refers to such a structure as an Information-centric network (ICN), which is a new Information-centric network architecture, and the ICN aims to replace the existing IP network to meet the increasing network requirements of people.
An ICN is a new network structure that identifies the name of a data object rather than the host location. The network's associated operations are independent of the location identifier (IP address) and are bound to the name of the data object's content, and ICN transport is based on a publish-subscribe messaging flow and is not limited to the network's addressable interface, in contrast to the current sender-based TCP/IP model. The sending of the data packet is triggered by a user request, the user request is routed through a naming mode, the nodes with the cache the passing contents, and the data is transmitted through a reverse path of the corresponding interest request. In addition, because the ICN is based on the object, the information security is only related to the content object itself, so the security of the ICN network can be separated from the data integrity and confidentiality, and a new more reasonable security mode is realized. In view of the above description, ICN is a new network structure that perfectly fits future 5G networks.
On the other hand, a Software-Defined network (SDN) separates a forwarding plane from a control plane, and enables the forwarding plane to support more and more complex protocols upwards while giving the control plane more flexibility. The current standard openflow1.x for SDN is still IP protocol oriented, so that these studies can only stay in the envisaged phase. The Protocol-unaware Forwarding (POF) is an extension to the OpenFlow Protocol and is also a candidate component of the OpenFlow2.0 standard in the introduction. At present, the existing physical equipment of the POF project can be used for actual network deployment, so that a system for researching 5G-ICN fusion in a network layer has a practical foundation.
In existing mobility support schemes:
1. no mechanism for finding movement is explicitly given: some schemes default that a terminal can sense that the terminal moves when accessing or providing content, and actively exchange messages and data between front and back access points to realize seamless movement, but because mobile management and content access belong to two layers and direct communication is not available, the default precondition is not satisfied.
2. There is no quantitative reliable caching mechanism: some schemes report a control plane when a consumer fails to acquire content, the control plane checks a routing path hop by hop, finds out a problem and reconstructs and restarts the routing, but because the time from the failure of acquiring the content to the restart of the routing is uncertain, the lost content has no quantitative and reliable cache, and the seamless movement is difficult to achieve.
Disclosure of Invention
The invention aims to provide an ICN seamless mobile system based on an SDN framework, which can realize seamless mobile and enable a user to recover data lost due to a mobile switching process as required.
The purpose of the invention is realized by the following technical scheme:
an ICN seamless mobile system based on an SDN framework is provided, which comprises a POF controller, a session management module, a content management module and a plurality of edge switches, wherein the POF controller, the session management module, the content management module and the edge switches are arranged in an ICN core network control domain;
the mobile terminals carried by the producer and the consumer are correspondingly marked as a first mobile terminal and a second mobile terminal; the first mobile terminal and the second mobile terminal are respectively accessed to an ICN core network control domain through an access point and an edge switch;
when the first mobile terminal or the second mobile terminal moves and switches the access point, the edge switch corresponding to the new access point cannot match the corresponding ID, so that the edge switch is forwarded to the POF controller, the POF controller cooperates with the session management module and/or the content management module to determine session information, and a path is re-planned to send a flow table; and then, the first mobile terminal matches the mobile identification bits according to the received request and returns the content cached in the mobile switching process of the first mobile terminal or the second mobile terminal, and the second mobile terminal processes the received content according to the sequence number of the content data block.
The technical proposal provided by the invention can show that the access network and the core network, the control plane and the user plane are independent, and the intrinsic communication mechanism based on the ICN protocol finds whether the terminal moves when accessing or providing the content in the shortest time by depending on the exchanger and the controller supporting the POF protocol; meanwhile, quantitative and reliable seamless movement is realized through periodical continuous caching of a producer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ICN seamless mobile system based on an SDN architecture according to an embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of an ICN seamless mobile system based on an SDN architecture according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a second mobile terminal obtaining content seamlessly according to an embodiment of the present invention;
fig. 4 is a flowchart of a seamless content provision by a first terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an ICN seamless mobile system based on an SDN framework, which is a scheme that is realized by IN routing based on a POF controller and a switch and can minimize the loss of access content IN the communication process. In order to reduce system load, seamless mobility should only be targeted to mobile terminals that are performing traffic, and no traffic-free terminals will trigger the mechanism when moving. In order to implement this scheme, in the embodiment of the present invention, it is considered that the ID of the content is self-generated and self-verified according to a uniform rule, and the content is transmitted in data blocks and numbered in sequence; creating a session for each service which needs to realize seamless movement, and maintaining a buffer area for each of a producer end and a consumer end (corresponding to the first mobile terminal and the second mobile terminal), wherein the first mobile terminal slidingly buffers sent data according to a specified period from the beginning of creating the session service so as to return content which is possibly lost, and the second mobile terminal is used for further processing received packets in the buffer. In addition to this, in the session continuation phase, the consumer periodically sends a request to the control plane, and the producer periodically sends a content issue message to the control plane, in such a manner that the controller sets a content maintenance flow table in the POF-SW (edge switch) for the producer: after receiving the content release message, the POF-SW does not forward the content release message to the control plane every time, but forwards the content release message to the control plane after accumulating the content release message for a certain number of times or a certain time, and the control plane performs movement perception according to the number of times or the time.
The architecture and the application scenario of the system provided by the embodiment of the invention are respectively shown in fig. 1-2. The system can comprise a plurality of ICN core network control domains and a global system for carrying out global analysis.
Each ICN core network control domain includes a POF controller (POF-Ctrl), a session management module (SM), a content management module (CM), and a plurality of edge switches.
The functions of the devices in the system are as follows: GNCAR implements domain resolution (only managed to the domain level) to which global objects belong; content management module (CM) controls content management and address resolution within the domain (to switch ports); the POF controller (POF-Ctrl) performs path planning, topology management and flow table distribution; a session management module (SM) controls session management within a domain; the edge switch forwards the message of the access device.
The interfaces and parameters involved in the above system are as follows: 1. three types of messages: content publishing, content request (interest package), return data (all including content ID, sender ID, switch ID and port). 2. Interface protocol: 1) consumer vs SW; 2) SW vs Ctrl; 3) ctrl vs SM; 4) SM vs CM; 5) CM vs GNCAR; 6) SW vs. Producer.
In the embodiment of the invention, the mobile terminals carried by a producer and a consumer are correspondingly marked as a first mobile terminal and a second mobile terminal; the first mobile terminal and the second mobile terminal are respectively accessed to the ICN core network control domain through an edge switch (POF switch POF-SW) through an access point. The access point may be a WIFI access point or a base station or other type of access point.
In the embodiment of the invention, when a first mobile terminal or a second mobile terminal moves and switches access points, an edge switch corresponding to a new access point cannot match a corresponding ID (identity) and then forwards the ID to a POF (point of presence) controller, the POF controller cooperates with a session management module and/or a content management module to determine session information, and a path is re-planned to send a flow table; and then, the first mobile terminal matches the mobile identification bits according to the received request and returns the content cached in the mobile switching process of the first mobile terminal or the second mobile terminal, and the second mobile terminal processes the received content according to the sequence number of the content data block.
The above process is actually divided into two cases:
1. seamless acquisition of content while the second mobile terminal is moving
When the second mobile terminal carried by the consumer moves and switches the access point, the process of seamlessly acquiring the content is as follows:
after the second mobile terminal moves and switches the access points, the edge switch corresponding to the new access point cannot match the content ID of the interest packet sent by the second mobile terminal, so that the interest packet is forwarded to the POF controller;
identifying the POF controller as a session type service, and inquiring a session management module; the session management module feeds back the session information of the session type service to the controller; the session information includes: an ID and address of the first mobile terminal; the POF controller replans the path to send a flow table according to the received session information, and the mobile identifier in the interest packet is forwarded to the corresponding edge switch downwards; the edge switch forwards the interest packet according to the flow table; the first mobile terminal matches the mobile identification bits according to the received interest packets, and returns the content cached in the mobile switching process of the second mobile terminal, and then returns the subsequent content; and the second mobile terminal processes the received content according to the sequence number of the content data block.
2. The first mobile terminal seamlessly provides content while moving.
When a first mobile terminal carried by a producer moves and switches an access point, the process of seamlessly providing content is as follows:
after the first mobile terminal moves and switches the access points, the first mobile terminal issues contents, and the edge switch corresponding to the new access point cannot match the content ID, so that the contents are forwarded to the POF controller;
after identifying the released content, the POF controller transfers the content to a content management module; the content management module inquires the content item to find the content associated with the session, and inquires the session management module; the session information inquired by the session management module is transmitted to the POF controller through the content management module; the POF controller replans a path to send a flow table according to the received session information, constructs an interest packet related to the session, sets a mobile identification position in the interest packet and forwards the mobile identification position to a corresponding edge switch; the edge switch forwards the interest packet according to the flow table; the first mobile terminal matches the mobile identification bits according to the received interest packets, and returns the content cached in the mobile switching process of the first mobile terminal, and then returns the subsequent content; and the second mobile terminal processes the received content according to the sequence number of the content data block.
As described above, in order to reduce system load, seamless mobility is only for the first mobile terminal and the second mobile terminal that are performing traffic; creating a session for each service needing seamless movement, and respectively maintaining a buffer area for the first mobile terminal and the second mobile terminal; the first mobile terminal, from the beginning of session service creation, slidingly caches the sent content at a specified period.
The above is the main scheme for realizing seamless movement of the system provided by the embodiment of the invention. For ease of understanding, the following description will be made again in conjunction with the main flow of the system.
The main flow of the system is divided into four parts: a producer issues content through a first mobile terminal; the consumer requests the content to establish a new session through the second mobile terminal; the consumer carries the second mobile terminal to seamlessly obtain the content when moving; the producer seamlessly provides the content while moving with the first mobile terminal.
1. The producer issues the content through the first mobile terminal.
The producer is required to periodically publish the content via the first mobile terminal to maintain the content's updates and content accessibility. The concrete implementation is as follows:
1) the first mobile terminal issues content to the attached access point, and the content is forwarded to the corresponding edge switch (POF-SW) by the access point for flow table matching.
2) If the matching is successful, transmitting the content according to the flow table rule; if the matching content ID fails, the content ID is forwarded to the POF controller.
3) The POF controller forwards the content to the content management module; if the content is received for the first time, the content management module creates a content item, sends a content publishing success message to the POF controller, requests the POF controller to make a content maintaining flow table, communicates with the global system, and registers an ICN core network control domain where the content is located in the global system; otherwise, the content management module maintains the state of the content live (i.e., the content valid state);
4) then, the controller issues a content maintenance flow table to the edge switch;
5) the first mobile terminal periodically and repeatedly distributes content messages, matches a content maintaining flow table in the edge switch, and redistributes the content to keep the content live state, if the content management module does not receive the content messages within a certain time period, the corresponding content items are deleted.
2. The consumer requests the content to establish a new session through the second mobile terminal
The consumer should issue the request periodically during the session duration through the second mobile terminal to maintain the continuity of the content access, which is implemented as follows:
1) the second mobile terminal issues a request and sends an interest packet to the attached access point, and the interest packet is sent to the corresponding edge switch for matching.
2) When the content is requested for the first time, the edge switch fails to match the content ID and forwards the content ID to the POF controller.
3) The POF controller judges whether the service is a session type service, and if so, the POF controller forwards the service to the session management module.
4) The session management module requests the content management module for content address resolution, and the content management module inquires the content address and returns the content address to the session management module.
5) The session management module establishes a new session item and feeds back session information to the POF controller, and submits the session information to the content management module, and the content management module associates corresponding content and session; meanwhile, the session management module also registers session information with the global system so as to realize cross-domain query later.
6) The POF controller plans a path according to the session information, makes an ICN protocol flow table, realizes an ICN route, issues the ICN protocol flow table to the edge switch and forwards the request interest packet downwards; and finally, the second mobile terminal successfully acquires the required content from the first mobile terminal.
3. And the consumer seamlessly acquires the content when moving with the second mobile terminal.
Assuming that the customer moves with the second mobile terminal, the accessed edge switch changes from SW to SW2, as shown in fig. 3, the main process is as follows:
1) and the second mobile terminal moves, switches the access point and sends out the interest packet.
2) The new access switch SW2 fails to match the content ID and SW2 forwards the interest packet to the POF controller.
3) The POF controller recognizes the session type service and inquires the session management module.
4) The session management module feeds back the session information of the session type service, such as the producer ID and the address, to the POF controller.
5) And the POF controller replans the path and issues the flow table.
6) The POF controller places the mobile identity bits in the interest package and forwards them down to SW 2.
7) SW2 forwards the interest packet according to the flow table.
8) And the first mobile terminal matches the mobile identification bit after receiving the interest packet, and returns the cached content and then returns the subsequent content.
9) And the second mobile terminal processes according to the content data block sequence number to finish seamless movement.
4. The producer seamlessly provides the content while moving with the first mobile terminal.
Assuming that the producer moves with the first mobile terminal, the access edge switch changes from SW to SW2, as shown in fig. 4, the main process is as follows:
1) the first mobile terminal moves to switch access points and distributes content.
2) The new access switch SW2 fails to match the ID and forwards it to the POF controller.
3) The POF controller identifies the released content and transfers the content to the content management module.
4) The content management module inquires the content items to find the content associated session and inquires the session management module.
5) The session management module feeds back the session information of the session service to the content management module.
6) And the content management module feeds back the session information to the POF controller.
7) The POF controller replans the path to send the flow table, constructs an interest packet related to the conversation, and sets the mobile identification position in the interest packet and forwards the mobile identification position downwards.
8) SW2 forwards the interest packet per the flow table.
9) And the first mobile terminal receives the interest packet and then matches the mobile identification bit to send back the cached content.
10) And the second mobile terminal processes according to the content data block sequence number to finish seamless movement.
Compared with the prior art, the scheme of the embodiment of the invention mainly has the following beneficial effects:
1. the access network is independent of the core network, the control plane and the user plane, and the switch and the controller which support the POF protocol are relied on, and whether the terminal moves when accessing or providing the content is discovered in the shortest time based on the inherent communication mechanism of the ICN protocol.
2. The producer realizes quantitative and reliable seamless movement through the periodical continuous cache of the first mobile terminal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An ICN seamless mobile system based on an SDN framework is characterized in that a POF controller, a session management module, a content management module and a plurality of edge switches are arranged in an ICN core network control domain;
the mobile terminals carried by the producer and the consumer are correspondingly marked as a first mobile terminal and a second mobile terminal; the first mobile terminal and the second mobile terminal are respectively accessed to an ICN core network control domain through an access point and an edge switch;
when the first mobile terminal or the second mobile terminal moves and switches the access point, the edge switch corresponding to the new access point cannot match the corresponding ID, so that the edge switch is forwarded to the POF controller, the POF controller cooperates with the session management module and/or the content management module to determine session information, and a path is re-planned to send a flow table; and then, the first mobile terminal matches the mobile identification bit according to the received request and returns the content in the sliding cache aiming at the related service, and the second mobile terminal processes the received content according to the sequence number of the content data block.
2. The ICN seamless mobility system based on SDN architecture of claim 1, wherein when a second mobile terminal carried by a consumer moves and switches an access point, the process of seamlessly obtaining content is as follows:
after the second mobile terminal moves and switches the access points, the edge switch corresponding to the new access point cannot match the content ID of the interest packet sent by the second mobile terminal, so that the interest packet is forwarded to the POF controller;
identifying the POF controller as a session type service, and inquiring a session management module; the session management module feeds back the session information of the session type service to the controller; the session information includes: an ID and address of the first mobile terminal; the POF controller replans the path to send a flow table according to the received session information, and the mobile identifier in the interest packet is forwarded to the corresponding edge switch downwards; the edge switch forwards the interest packet according to the flow table; the first mobile terminal matches the mobile identification position according to the received interest packet, returns all contents in the current cache region of the session corresponding to the second mobile terminal, and then returns the subsequent contents; and the second mobile terminal processes the received content according to the sequence number of the content data block.
3. The ICN seamless mobility system based on SDN architecture of claim 1, wherein when a first mobile terminal carried by a producer moves and switches access points, the process of seamlessly providing content is as follows:
after the first mobile terminal moves and switches the access points, the first mobile terminal issues contents, and the edge switch corresponding to the new access point cannot match the content ID, so that the contents are forwarded to the POF controller;
after identifying the released content, the POF controller transfers the content to a content management module; the content management module inquires the content item to find the content associated with the session, and inquires the session management module; the session information inquired by the session management module is transmitted to the POF controller through the content management module; the POF controller replans a path to send a flow table according to the received session information, constructs an interest packet related to the session, sets a mobile identification position in the interest packet and forwards the mobile identification position to a corresponding edge switch; the edge switch forwards the interest packet according to the flow table; the first mobile terminal matches the mobile identification bits according to the received interest packets, returns the content in the sliding cache aiming at the related service, and then returns the subsequent content; and the second mobile terminal processes the received content according to the sequence number of the content data block.
4. An ICN seamless mobility system based on SDN architecture according to any of claims 1-3, characterized in that seamless mobility is only for a first mobile terminal and a second mobile terminal that are executing a service;
creating a session for each service needing seamless movement, and respectively maintaining a buffer area for the first mobile terminal and the second mobile terminal; the first mobile terminal, from the beginning of session service creation, slidingly caches the sent content at a specified period.
5. An ICN seamless mobile system based on SDN architecture according to any of claims 1-3, wherein the first mobile terminal issues content as follows:
the first mobile terminal issues content to an attached access point, and the content is forwarded to a corresponding edge switch by the access point for flow table matching;
if the matching is successful, transmitting the content according to the flow table rule; if the matching content ID fails, forwarding the matching content ID to the POF controller;
the POF controller forwards the content to the content management module; if the content is received for the first time, the content management module creates a content item, sends a content publishing success message to the POF controller, requests the POF controller to make a content maintaining flow table, communicates with the global system, and registers an ICN core network control domain where the content is located in the global system; otherwise, the content management module keeps the state of the content live;
then, the controller issues a content maintenance flow table to the edge switch;
the first mobile terminal periodically and repeatedly distributes content messages, matches a content maintaining flow table in the edge switch, and redistributes the content to keep the content live state, if the content management module does not receive the content messages within a certain time period, the corresponding content items are deleted.
6. An ICN seamless mobility system based on SDN architecture according to any of claims 1-3, wherein the second mobile terminal requests content to establish a new session as follows:
the second mobile terminal issues a request and sends an interest packet to an attached access point, and the interest packet is sent to a corresponding edge switch for matching;
when the content is requested for the first time, the edge switch fails to match the content ID and forwards the content ID to the POF controller;
the POF controller judges whether the service is a session type service, if so, the POF controller forwards the service to a session management module;
the session management module requests the content management module for content address resolution, and the content management module inquires the content address and returns the content address to the session management module;
the session management module establishes a new session item and feeds back session information to the POF controller, and submits the session information to the content management module, and the content management module associates corresponding content and session; meanwhile, the content management module also registers the binding information of the content and the session to the global system so as to realize cross-domain query later;
the POF controller plans a path according to the session information, makes an ICN protocol flow table, realizes an ICN route, issues the ICN protocol flow table to the edge switch and forwards the request interest packet downwards; and finally, the second mobile terminal successfully acquires the required content from the first mobile terminal.
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