KR101706342B1 - Controller, switch and method based on open flow supporting data rate of packets on network - Google Patents

Abstract

The present invention includes a communication module for transmitting and receiving a packet, a memory for storing a program for processing a packet, and a processor for executing a program. At this time, a processor determines whether the packet is a packet for real-time service, when the processing request for the packet is received from an open flow switch according to the execution of the program, specifies a routing path corresponding to the packet based on state information on the network collected through an open flow protocol, and transmits the packet and a priority adjustment request corresponding to the packet to one or more open flow switches located in a designated routing path when the packet is a packet for real-time service. So, the transmission rate of real-time service packets and general service packets over the network can be supported.

Description

TECHNICAL FIELD [0001] The present invention relates to an open-flow-based controller, a switch, and a transmission rate supporting method for supporting a packet transmission speed on a network.

The present invention relates to an open flow based controller, a switch, and a transmission rate supporting method for supporting the transmission speed of a packet on a network.

Recently, with the development of network technology and the emergence of internet of things (IoT) and machine to machine (M2M), the amount of data usage of users on the network has increased and usage patterns are also changing. Particularly, as the use of mobile devices increases, the demand of users who want to receive high quality services such as audio on demand (AOD) and video on demand (VOD) in real time is also increasing. As such, recent networks are becoming increasingly complex and growing in scale. Therefore, there is a limit to control the network in this environment using the existing network management model.

As the size and scale of the network grows, a software defined networking (SDN) architecture has emerged to efficiently manage the network. A software defined network is a technology capable of implementing a network that has been implemented based on hardware such as a conventional router or a switch in software. The software defined network can also control the network based on the central control scheme.

An openflow-based network is an interface technology for realizing a software-defined network. An open flow based network performs control of a network in a centralized manner based on an open flow controller installed in a server or a computing device in the form of software. At this time, the open flow controller controls the switch in the existing network. That is, it controls one or more openflow switches through an openflow protocol. Since the open flow based network controls the network in a centralized manner, it is important to provide improved quality of service (QoS) for each service provided by the network.

In this regard, Korean Patent Laid-Open Publication No. 10-2014-0135000 (entitled " Software Defined Networking-Based Communication System Service Processing Method ") discloses a method and apparatus for processing services of a software defined network-based communication system . More particularly, the present invention relates to a mobile communication system comprising a first base station, a first open flow switch operatively associated with a first base station, a first access cache operatively associated with a first open flow switch, a second base station adjacent to the first base station, And a second access cache interlocked with the second open flow switch and the second open flow switch. In this case, when a packet is received from a terminal connected to a first base station, an access cache in which a content corresponding to the packet is stored is checked. If the confirmed access cache is the second access cache, The path of the open flow switches is set.

SUMMARY OF THE INVENTION The present invention provides an open flow controller, an open flow switch, and a transmission rate support method for supporting a transmission rate of a real-time service packet and a general service packet on a network, There is a purpose.

It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided an open flow controller for supporting a packet transmission speed on a network, including a communication module for transmitting and receiving a packet, a memory storing a program for processing a packet, And a processor. At this time, when the processor receives the processing request for the packet from the open flow switch according to the execution of the program, the processor determines whether the packet is a packet for the real-time service, and based on the status information of the network collected through the open- And if the packet is a packet for a real-time service, sends a priority adjustment request corresponding to the packet and the packet to one or more open flow switches located in the designated routing path.

According to a second aspect of the present invention, there is provided an open flow switch for supporting packet transmission speed on a network, comprising: a memory for storing a communication module for transmitting and receiving a packet, a meter table and a program for processing a packet, . Upon receiving the priority adjustment request corresponding to the packet and the packet from the open flow controller according to the execution of the program, the processor sets a meter table corresponding to the packet according to the priority adjustment request and processes the packet.

A method for supporting a transmission rate of an open flow controller on a network according to the third aspect of the present invention includes collecting status information of a network through an open flow protocol upon receiving a processing request for a packet from the open flow switch; Designating a routing path corresponding to the packet based on the collected state information; Determining whether a packet is a packet for a real-time service; And sending a priority adjustment request corresponding to the packet and the packet to the one or more open flow switches located in the designated routing path after the step of designating the routing path if the packet is for a real-time service.

The method for supporting the transmission rate of the open flow switch on the network according to the fourth aspect of the present invention is characterized in that upon receiving a priority adjustment request corresponding to packets and packets from the open flow controller, Setting a meter table; And processing the packet.

The present invention can specify an optimal routing path in a network for transmitting a packet for a real-time service to a destination terminal. In addition, the present invention can quickly process packets in an open flow switch existing in a routing path. Therefore, the present invention can provide a real-time service with high QoS to a user.

1 is an illustration of an open flow based network supporting packet transmission rates in accordance with an embodiment of the present invention.
2 is a block diagram of an open flow controller according to an embodiment of the present invention.
3 is an illustration of a meter table according to an embodiment of the present invention.
4 is a block diagram of an open flow switch according to an embodiment of the present invention.
5 is a flowchart of a method of supporting a transmission rate of an open flow controller according to an embodiment of the present invention.
6 is a flowchart of a method of supporting a transmission rate for a packet for real-time service of an open flow switch according to an embodiment of the present invention.
7 is a flowchart of a method of supporting a transmission rate for a packet for a general service of an open flow switch according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

The following will describe an open flow based network 10 according to an embodiment of the present invention with reference to FIG.

1 is an exemplary diagram of an open flow based network 10 supporting packet transmission rates in accordance with an embodiment of the present invention.

The open flow based network 10 according to an embodiment of the present invention performs packet communication between the terminals 120 based on an open flow protocol. At this time, the open flow based network 10 includes an open flow controller 100, an open flow switch 110 and a terminal 120.

The open flow controller 100 receives a packet transmitted from the terminal 120 from the open flow switch 110. The open flow controller 100 sets a routing path for the packet and forwards the packet to one or more open flow switches 110 connected to the open flow controller 100. At this time, the open flow controller 100 may be implemented as software in a computer or a server.

The open flow switch 110 receives a packet from the terminal 120 and transmits the packet to the open flow controller 100. The open flow switch 110 performs processing such as transferring, modifying, and discarding a packet to the destination terminal 120 in accordance with a packet processing command of the open flow controller 100. At this time, the open flow switch 110 may be a switch capable of handling an open flow protocol, or a general Ethernet switch (firmware) with firmware or software added thereto for processing an open flow protocol.

In addition, the terminal 120 can transmit a packet to another terminal or receive a packet from another terminal. At this time, the terminal 120 may be a server, a computer, and a mobile device, but is not limited thereto.

Next, an open flow controller 100 according to an embodiment of the present invention will be described with reference to FIG. 2 and FIG.

2 is a block diagram of an open flow controller 100 according to an embodiment of the present invention.

The open flow controller 100 according to an embodiment of the present invention divides a packet received from the open flow switch 110 into a packet for a real-time service and a packet for a general service. The open-flow controller 100 processes packets according to the packet classification. At this time, the open flow controller 100 includes a communication module 200, a memory 210, and a processor 220.

The communication module 200 performs transmission and reception of packets with the open flow switch 110.

The memory 210 stores a program for processing packets. At this time, the memory 210 collectively refers to a non-volatile storage device that keeps stored information even when power is not supplied, and a volatile storage device that requires power to maintain stored information.

When the processor 220 receives a processing request for a packet from the open flow switch 110 through the communication module 200 according to execution of a program for processing a packet stored in the memory 210, It is determined whether the packet is a packet for

At this time, the processor 220 can determine whether the packet is a packet for a real-time service or a packet for a general service based on a packet identifier. At this time, the real-time service may be a real-time streaming service. In addition, the general service may be a non-real-time service except for the real-time service. Specifically, the processor 220 may determine the type of protocol of the packet based on the identifier of the packet. The processor 220 can determine whether the packet is a packet for a real-time service or a packet for a general service according to the determined protocol type.

For example, when a packet is transmitted using a UDP (user diagram protocol), the processor 220 can classify the packet into packets for real-time service. In addition, when the packet is transmitted in a protocol different from the UDP, the processor 200 can classify the packet as a packet for the general service. At this time, UDP is used for packet transmission for services such as Domain name service (DNS), Internet protocol television (IPTV), vocal over internet protocol (VoIP) .

The processor 220 also collects network status information based on the open flow protocol. The processor 220 then specifies the routing path corresponding to the packet in the collected network status information. At this time, the routing path may be calculated based on any one of an open shortest path first (OSPF) and a routing information protocol (RIP).

The shortest path priority protocol is a protocol that sets the routing path with priority to the path with the smallest packet transmission cost to the destination terminal. The routing information protocol is a protocol for generating a routing path to a destination based on a distance vector algorithm for a hop count. At this time, the distance vector algorithm is an algorithm for predicting an optimal path based on information of nodes such as directly connected switches, routers, and terminals.

Meanwhile, when the packet received by the communication module 200 is a real-time service packet, the processor 220 transmits a packet to the open flow switch 110 located in the calculated routing path through the communication module 200 . The processor 220 may transmit a priority adjustment request corresponding to the packet to the open flow switch 110 that has transmitted the packet. At this time, the open flow switch 110 receiving the priority adjustment request can set a meter table pre-stored in the open flow switch 100 in response to the received packet, and adjust the priority. The meter table will be described with reference to Fig.

The open flow switch 110 may store a flow table, a group table, and a meter table in the memory 410 included in the open flow switch 110. The flow table may store a condition, a counter, and an action for a packet to be processed by the open flow switch 110. The group table can store action buckets, which are sets for processing stored in a flow table. The metric table may store the speed, action, and the like assigned to the packet received by the open flow switch 110.

3 is an illustration of a meter table according to an embodiment of the present invention.

Specifically, the meter table can be executed through an action stored in a flow table. And the meter table can measure and control the assigned speed of the packet. 3 (a), the meter table may include an identifier identifier 300, a band attribute 310, and a counter attribute 320 as attributes.

The identifier attribute 300 may store information that can distinguish the meter. In addition, the bandwidth attribute 310 may store the speed of the packet and the manner in which the packet is processed by the open flow switch 110. In the counter attribute 320, the number of packets processed by the corresponding meter may be stored.

At this time, the band property 310 includes a band type 311, a rate 312, a burst 313, a band counter 314, and a band type option 315 as shown in FIG. . ≪ / RTI > The band type 311 stores a packet processing method. Rate 312 is the minimum rate that can be applied to the band, and burst 313 stores the maximum rate that can be applied to the packet. The band counter 314 stores the number of packets processed by the metric band and the band type option 315 indicates a drop priority of a differentiated service code point (DSCP) field in packet drop or IP header information Height, and so on.

The open flow switch 110 may adjust the priority by increasing or decreasing the value stored at the rate in the band attribute of the metric table. Therefore, when the processor 220 sends a priority adjustment request to the open flow switch 110, the open flow switch 110 receiving the priority adjustment request receives the rate 312 from the band attribute 310 of the meter table The priority can be adjusted by setting it to correspond to a priority adjustment request.

For example, the processor 220 adjusts the priority of the packet for the real-time service to a higher priority for the open flow switch 110 so that the open flow switch 110 can process the packet for the real-time service faster than the packet for the normal service A priority adjustment request may be transmitted. Upon receiving the priority adjustment request, the open flow switch 110 may set the rate 312 to a value larger than a predetermined value. When the open flow switch 110 processes the packet, the open flow switch 110 can process based on a rate 312 that is set to a value larger than a predetermined value. Therefore, the op-flow switch 110 can process the packet faster than the packet whose rate 312 is not prioritized.

If the received packet is a packet for a general service, the processor 220 transmits, via the communication module 200, one or more open flow switches 110 located in the designated routing path to a flow entry ). ≪ / RTI > The open flow switch 110 receiving the flow entry can set a flow entry in the flow table included in the open flow switch 110.

The flow table stored in the memory 410 of the open flow switch 110 may include one or more flow entries. At this time, the flow entry may include conditions, counters, and actions for the packet.

As described above, in the case of a packet for the general service, the processor 220 transmits only the flow entry without sending the priority adjustment request to the open flow switch 110 included in the routing path. Therefore, the open flow switch 110 does not set the rate 312 of bands included in the metric table, so it can process packets for normal service according to a predetermined rate 312.

Meanwhile, in the processor of the open flow controller according to another embodiment of the present invention, when the received packet is a general service packet, the open flow controller included in the routing path specified for the packet A ranking adjustment request can be transmitted. Therefore, the open flow switch receiving the priority adjustment request can adjust the priority by setting the rate included in the meter table stored in the open flow switch lower than the rate of other packets.

Also, if the received packet is a real-time service packet, the processor can cause the open-flow switch to set a pre-stored meter table in response to the packet. When the open flow switch receives the meter table setting request, it can set the meter table corresponding to the packet.

Next, an open flow switch 110 according to an embodiment of the present invention will be described with reference to FIG.

4 is a block diagram of an open flow switch 110 according to an embodiment of the present invention.

The open flow switch 110 receives a packet from the open flow controller 100 and transmits the packet to one or more other open flow switches 110 or one or more terminals 120 connected to the open flow switch 110 as described above. The open flow switch 110 can transmit a packet received from another open flow switch 110 to another open flow switch 110 or the open flow controller 100 and the terminal 120, To the open-flow controller 100. The open- At this time, the open flow switch 110 includes a communication module 400, a memory 410, and a processor 420.

The communication module 400 transmits and receives packets from the open flow controller 100, the terminal 120, and other open flow switches 110.

The memory 410 stores a program for processing the packet. At this time, the memory 410 collectively refers to a non-volatile storage device that keeps stored information even when power is not supplied, and a volatile storage device that requires power to maintain stored information.

The processor 420 receives the priority adjustment request corresponding to the packet and the packet from the open flow controller 100 through the communication module 400 according to the execution of the packet processing program stored in the memory 410. [ At this time, the packet may be a packet for performing a real-time service.

The processor 420 sets a meter table corresponding to the packet according to the priority adjustment request received from the open flow controller 100 and processes the packet. At this time, the meter table is as described above with reference to FIG.

Specifically, when the processor 420 receives the priority adjustment request from the open flow controller 100, the processor 420 can set the rate 312 included in the metric table corresponding to the packet. As described above with reference to FIG. 3, the rate 312 of the meter table is an attribute that stores the minimum transmission rate. Therefore, if the processor 420 adjusts the rate 312 corresponding to the packet that received the priority adjustment request to be higher than the rate corresponding to another packet, the processor 420 preferentially processes the packet that received the priority adjustment request .

If the processor 420 receives the flow entry corresponding to the packet and the packet from the open flow controller 100 via the communication module 400, the processor 420 determines whether the flow table received in the flow table stored in the memory 410 A flow entry can be set. At this time, the flow entry may be the one transmitted by the open flow controller 100 when the packet received by the processor 420 through the communication module 400 is a packet for a general service, not a packet for a real-time service.

The processor 420 can process the received packet according to the set flow table after setting the flow entry received from the open flow controller 100 in the flow table.

Next, a method of supporting the transmission rate of the open flow controller 100 according to an embodiment of the present invention will be described with reference to FIG.

5 is a flowchart of a method of supporting a transmission rate of the open flow controller 100 according to an embodiment of the present invention.

When the open flow controller 100 receives a processing request for a packet from the open flow switch 110 (S500), the open flow controller 100 first collects the status information of the network through the open flow protocol (S510).

Then, the open-flow controller 100 specifies a routing path corresponding to the packet based on the collected state information (S520). At this time, the routing path may be calculated based on either the shortest path priority protocol or the routing information protocol.

Also, the open-flow controller 100 determines whether the packet received from the open-flow switch 110 is a packet for real-time service (S530). At this time, the open flow controller 100 may determine whether the packet is a packet for a real-time service or a packet for a general service based on an identifier of the packet. At this time, the real-time service may be a real-time streaming service. In addition, the general service may be a non-real-time service except for the real-time service.

If it is determined that the packet is a packet for real-time service (S540), the open-flow controller 100 transmits a priority adjustment request corresponding to the packet and the packet to the open-flow switch 110 located in the designated routing path (S550) . At this time, the priority adjustment request is a request to set the pre-stored meter table in the open flow switch 110 in response to the packet received by the one or more open flow switches 110 receiving the packet. That is, when the open flow controller 100 sends a priority adjustment request to the open flow switch 110, the open flow switch 110 sets the rate 320 included in the meter table stored in the open flow switch 110 to You can set and prioritize.

If the packet is not a packet for a real-time service but a packet for a general service, the open-flow controller 100 may send a flow entry corresponding to the packet to one or more open-flow switches 110 located in the designated routing path (S560). At this time, the open flow switch 110 receiving the flow entry can set the received flow entry in the pre-stored flow table.

Next, a method of supporting the transmission speed of the open flow switch 110 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG.

6 is a flowchart of a method of supporting a transmission rate for a packet for real-time service of the open flow switch 110 according to an embodiment of the present invention.

The open flow switch 110 receives the priority adjustment request corresponding to the packet and the packet from the open flow controller 100 (S600). At this time, if the received packet is a packet for a real-time service, the priority adjustment request may be transmitted to the open flow switch 110 by the open flow controller 100.

The open flow switch 110 sets a meter table according to the received priority adjustment request (S610). At this time, the open flow switch 110 can set the rate included in the meter table in response to the priority adjustment request.

After the open flow switch 110 adjusts the meter table according to the priority adjustment request (S610), the open flow switch 110 processes the packet according to the set meter table (S620).

7 is a flowchart of a method of supporting a transmission rate for a packet for a general service of the open flow switch 110 according to an embodiment of the present invention.

If the open flow switch 110 receives a flow entry corresponding to a packet and a packet from the open flow controller 100 in step S700, the open flow switch 110 can set a flow entry in the pre-stored flow table S710). At this time, the flow entry may be the one transmitted by the open flow controller 100 when the packet received by the processor through the communication module is not a packet for real-time service but a packet for a general service.

Further, the open flow switch 110 can process the received packet according to the set flow table (S720) after setting the flow entry received from the open flow controller 100 in the flow table (S710).

The open flow controller 100, the open flow switch 110, and the transmission rate support method according to an exemplary embodiment of the present invention can specify an optimal routing path in a network that transmits a packet for real-time service to a destination terminal. In addition, the open flow controller 100, the open flow switch 110, and the transmission rate supporting method can quickly process packets in the open flow switch 110 existing in the routing path. Therefore, the open flow controller 100, the open flow switch 110, and the transmission rate supporting method can provide the user with high real-time QoS.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium can include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: Open flow based network
100: Open flow controller
110: Open flow switch
120: terminal
200: Communication module
210: memory
220: Processor
400: communication module
410: Memory
420: processor

Claims (14)

1. An open flow controller for supporting a packet transmission speed on a network,
A communication module for transmitting and receiving a packet,
A memory storing a program for processing a packet, and
And a processor for performing the program
When receiving the processing request for the packet from the open flow switch, the processor specifies the routing path corresponding to the packet based on the status information of the network collected through the open flow protocol,
Determining whether the packet is a packet for a real-time service based on a protocol type corresponding to the packet,
Sending a priority adjustment request corresponding to the packet to one or more open flow switches located in the designated routing path if the packet is a packet for a real-time service,
Wherein the priority adjustment request includes a rate value corresponding to the packet of the meter table stored in the open flow switch corresponding to the received packet by at least one open flow switch that has received the packet, , And a transmission rate supporting open-flow controller. delete The method according to claim 1,
The processor sends a flow entry corresponding to the packet to one or more open flow switches located in the designated routing path if the packet is not a packet for a real-time service,
And the open flow switch receiving the flow entry sets the received flow entry in the flow table pre-stored in the open flow switch receiving the request. The method according to claim 1,
Wherein the routing path corresponding to the packet is calculated based on either the shortest path priority protocol or the routing information protocol. An open-flow switch for supporting packet transmission speed on a network,
A communication module for transmitting and receiving a packet,
A memory storing a program for processing a packet, and
And a processor for executing the program,
The processor, when receiving the packet and the priority adjustment request corresponding to the packet from the open flow controller according to the execution of the program, updates the rate value of the packet more than the rate value of the other packet according to the priority adjustment request And processing the packet,
Wherein the priority adjustment request is transmitted based on a result of the determination after the open flow controller determines whether the packet is a packet for real-time service based on a protocol type corresponding to the packet,
Wherein the rate value of the other packet and the rate value of the packet are stored in a meter table included in the memory. delete delete 6. The method of claim 5,
Wherein the processor sets the flow entry in the flow table stored in the memory and processes the packet when receiving the packet and the flow entry corresponding to the packet from the open flow controller,
Wherein the flow entry is one that the open flow controller has transmitted to the open flow switch when the packet is not a packet for real-time service. A method for supporting a transmission rate of an open flow controller on a network,
Collecting state information of the network through an open flow protocol upon receiving a processing request for the packet from the open flow switch;
Designating a routing path corresponding to the packet based on the collected state information;
Determining whether the packet is a packet for a real-time service based on a protocol type corresponding to the packet; And
Transmitting the packet and a priority adjustment request corresponding to the packet to at least one open flow switch located in the designated routing path after the step of designating the routing path if the packet is a packet for real-time service, Including,
Wherein the priority adjustment request includes a rate value corresponding to the packet of the meter table stored in the open flow switch corresponding to the received packet by at least one open flow switch that has received the packet, To the open flow controller. delete 10. The method of claim 9,
Further comprising the step of, if the packet is not a packet for a real-time service, sending a flow entry corresponding to the packet to the one or more open flow switches located in the designated routing path after the step of specifying the routing path,
And the open flow switch receiving the flow entry sets the received flow entry in the flow table pre-stored in the open flow switch. A method for supporting a transmission rate of an open flow switch on a network,
Receiving a packet from the open flow controller and a priority adjustment request corresponding to the packet;
Setting a rate value of the packet to be larger than a rate value of another packet included in the meter table according to the received priority adjustment request; And
Processing the packet according to the set metric table,
Wherein the priority adjustment request is transmitted based on a result of the determination after the open flow controller determines whether the packet is a packet for real-time service based on a protocol type corresponding to the packet,
Wherein the rate value of the other packet and the rate value of the packet are stored in a meter table included in the memory. 13. The method of claim 12,
Further comprising setting the received flow entry in a pre-stored flow table when receiving a packet and a flow entry corresponding to the packet from the open flow controller. A computer-readable recording medium recording a program for performing the method according to any one of claims 9, 11, 12, 13, and 14 on a computer.

Images