KR102049044B1 - Method for controlling communication path in transport network and apparatus for the same - Google Patents

Abstract

A communication path control method by a communication path control server is disclosed. Determining resource status indicators of the plurality of transmitting nodes; Determining a channel quality indicator; Determining a network status indicator; Determining a final communication path based on the resource status indicator, the channel quality indicator, and the network status indicator. Therefore, it is possible to effectively control the transmission path in the wired / wireless integrated network.

Description

METHOD FOR CONTROLLING COMMUNICATION PATH IN TRANSPORT NETWORK AND APPARATUS FOR THE SAME}

The present invention relates to a communication path control method and apparatus, and more particularly to a communication path control method and apparatus in a transport network.

Mobile packets have increased due to the increase in the number of mobile subscribers, the spread of smart phones, etc., thereby increasing mobile packets over existing communication networks (e.g., communication networks using limited radio resources). Handling may not be easy. In order to solve this problem, small cell technology or the like may be introduced into a communication network. When small cell technology is introduced in a communication network, mobile packets can be efficiently processed due to a decrease in cell coverage and an increase in the number of cells per unit area.

However, as the number of cells increases, the number of packets transmitted from the core network (or service network) to the cells increases, so a transport network for efficiently transmitting the increased packets will be required. . In particular, a transport network for efficiently transmitting and receiving packets such as a fronthaul, a midhaul, a backhaul, and the like in a cloud-radio access network (C-RAN) will be needed. The transport network may be referred to as an "Xhaul transport network" or a "crosshaul transport network".

The transport network may support communication between a base station (or radio unit (RU), remote radio head (RRH), etc.) and a core network (or base band unit (BBU), etc.), and may transmit packets to the base station or core network. It may include a plurality of transmitting nodes for transmitting. Here, the BBU may be a "BBU pool". Communication between transmission nodes included in the transport network may be performed using wired communication technology (eg, optical communication technology, Ethernet technology, etc.) or wireless communication technology (eg, mmWave (millimeter wave) communication technology). Can be performed.

In a transport network in which wired communication technology is used (hereinafter, referred to as a "wired transport network"), communication path control is generally performed by a centralized flow control protocol based on a software defined network (SDN). Can be. In a transport network in which wireless communication technology is used (hereinafter, referred to as a "wireless transport network"), communication path control may be technically different from communication path control in a wired transport network. Therefore, when the communication path determination method defined for the wired transport network is used to determine the optimum communication path in the wireless transport network, it may be difficult to determine the optimal communication path.

An object of the present invention for solving the above problems is to provide a method for searching for and determining an optimal communication path in a wired or wireless communication-based transport network.

A communication path control method of a controller in a transport network according to an embodiment of the present invention for achieving the above object, to determine the final communication path to a plurality of transmission nodes included in the transport network Transmitting a request message requesting necessary information; In response to the request message, receiving a response message including information necessary for determining the final communication path; The final communication path is determined from among a plurality of predetermined candidate communication paths based on the total resource status indicator, the total channel quality indicator, and the overall network status indicator required for determining the final communication path determined based on the information included in the response message. Doing; And transmitting information of the final communication path to a plurality of transmission nodes included in the final communication path.

Here, the final communication path may be determined as a candidate communication path of which a sum of a plurality of resource status indicators, a plurality of channel quality indicators, and a plurality of network status indicators of a plurality of transmission nodes among the plurality of candidate communication paths is minimum. have.

Herein, the total resource state indicator may be determined by adding all resource state indicators indicating resource utilization rates of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths.

In this case, the overall channel quality indicator may be determined by adding all channel quality indicators indicating channel states obtained through a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths.

Here, the overall network state indicator may be determined by adding all network state indicators indicating congestion of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths.

Here, the final communication path may be determined by further considering the service priority of the operator transmitting the transmission data unit.

Here, the information of the final communication path may include a flow rule that is a rule for transmitting the transmission data unit through a plurality of transmission nodes included in the final communication path.

Here, the plurality of candidate communication paths include a plurality of communication paths including a source communication node and a destination communication node determined based on the source and destination information of the transmission data unit received from an end transmission node included in the transport network. Can be determined.

In order to achieve the above object, a controller for controlling a communication path in a transport network according to an embodiment of the present invention includes a processor; And a memory in which at least one instruction executed by the processor is stored, wherein the at least one instruction includes source and destination information of a transmission data unit received from an end transmission node included in the transport network. Establish a plurality of candidate communication paths based on the request, and transmit a request message for requesting information necessary for determining a final communication path to a plurality of transmitting nodes included in the transport network; In response to the request message, receives a response message including information necessary for determining the final communication path, and based on the information included in the response message, an overall resource status indicator and an overall channel quality required for determining the final communication path. Determine an indicator, a total network status indicator, determine the final communication path among the plurality of candidate communication paths based on the full resource status indicator, the full channel quality indicator, the full network status indicator, and the final communication It is executable to send the information of the path to a plurality of transmitting nodes included in the final communication path.

Here, the final communication path may be determined as a candidate communication path such that a sum of a plurality of resource status indicators, a plurality of channel quality indicators, and a plurality of network status indicators of a plurality of transmission nodes among the plurality of candidate communication paths is minimized. It may be executable.

Here, the total resource state indicator may be executable to be determined by adding all resource state indicators indicating resource utilization rates of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths.

Herein, the overall channel quality indicator may be executable to be determined by adding all channel quality indicators indicating channel states obtained through a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. .

Here, the overall network status indicator may be executable to be determined by adding all network status indicators indicating congestion of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths.

Here, the final communication path may be executable to be determined in consideration of the service priority of the operator transmitting the transmission data unit.

Here, the information of the final communication path may be executable to include a flow rule which is a rule for transmitting the transmission data unit through a plurality of transmission nodes included in the final communication path.

Here, the plurality of candidate communication paths include a plurality of communication paths including a source communication node and a destination communication node determined based on the source and destination information of the transmission data unit received from an end transmission node included in the transport network. It may be feasible to be determined among them.

In order to achieve the above object, a method of operating a transport node included in the transport network according to an embodiment of the present invention includes a processor; And a memory in which at least one instruction executed by the processor is stored, wherein the at least one instruction requests information for determining a final communication path from a plurality of transmission nodes included in the transport network. Transmits a request message, and in response to the request message, receives a response message including information necessary for determining the final communication path, and is required for determining the final communication path determined based on information included in the response message. Determine the final communication path among a plurality of predetermined candidate communication paths based on an overall resource status indicator, an overall channel quality indicator, and an overall network status indicator, and include information on the final communication path in the final communication path. Executable to transmit to the transmitting nodes of the.

Sending a message to a controller comprising source and destination information of the transmission data unit; Receiving a request message requesting information necessary for determining a final communication path from the controller; In response to the request message, sending a response message including information necessary for determining the final communication path to the controller; Receiving final communication path information from the controller; And transmitting a transmission data unit based on the final communication path information.

The information necessary for determining the final communication path includes a resource state indicator indicating a resource utilization rate of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths, and a plurality of information included in the specific candidate communication path. And a channel quality indicator indicating each channel state obtained through the transmitting nodes of the network, and a network state indicator indicating the congestion of the plurality of transmitting nodes included in the specific candidate communication path.

Here, the information of the final communication path may include a flow rule that is a rule for transmitting the transmission data unit through a plurality of transmission nodes included in the final communication path.

According to the present invention, there is an effect of reducing the transmission delay time that can occur in the transport network. In addition, the packet loss that can occur in the transport network can be reduced to increase the reliability of the transmission. The quality of transmission service can be further improved by reducing transmission delay time and improving transmission reliability.

1 is a conceptual diagram illustrating a first embodiment of a transport network.
2 is a block diagram showing a first embodiment of a communication node constituting a transport network.
3 is a flowchart showing a first embodiment of a communication method in a transport network.
4 is a block diagram illustrating a first embodiment of a controller in a transport network.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

In the following, a transport communication network to which embodiments according to the present invention are applied will be described. The transport network to which the embodiments according to the present invention are applied is not limited to the contents described below, and the embodiments according to the present invention can be applied to various transport networks.

1 is a conceptual diagram illustrating a first embodiment of a transport network.

Referring to FIG. 1, a transport network may include an access network, a transport network, a core network, and the like. The access network may include a plurality of terminals 110-1 to 110-8, a plurality of base stations 120-1 to 120-6, and the like. The plurality of base stations 120-1 to 120-6 may be a radio unit (RU), a remote radio head (RRH), or the like. The terminals 110-1 through 110-8 may be connected to the plurality of base stations 120-1 through 120-6, and the terminals 110-1 through 110-8 and the plurality of base stations 120-1 through The communication between 120-6) is 4G communication technology (e.g., long term evolution (LTE) communication technology, LTE-A (advanced communication technology) defined in the 3rd generation partnership project (3GPP), 5G communication technology (e.g., For example, the method may be performed based on a millimeter wave (mmWave) based communication technology, a new radio communication technology (NR), or the like.

The transport network may support communication between the access network and the core network. For example, the transport network may send packets received from the access network (eg, control packets, data packets) to the core network, and may send packets received from the core network to the access network. The transport network may be referred to as an "Xhaul transport network" or a "crosshaul transport network".

The transport network may include a plurality of transmitting nodes 130-1 to 130-12. Communication between transmission nodes 130-1 through 130-12 is performed using wired communication technology (e.g., optical communication technology, Ethernet technology, etc.) or wireless communication technology (e.g. mmWave communication technology). Can be. For example, communication between transmitting nodes # 1 to # 6 (130-1 to 130-6) may be performed using a wireless communication technique, and transmitting nodes # 7 to # 12 (130-7 to 130-12) The inter-communication may be performed using wired communication technology.

Operations (eg, packet transmission and reception operations) of the plurality of transmission nodes 130-1 to 130-12 included in the transport network may be controlled by the controller 140. The controller 140 may be included in the transport network. Alternatively, the controller 140 may be configured separately from the transport network. The end transport node of the plurality of transport nodes 130-1 to 130-12 may be connected to the access network, the core network, the controller 140, and the like. For example, the transmitting node # 1 130-1 may be connected to the core network, the controller 140, and the like, and each of the transmitting nodes # 4 to # 6 (130-4 to 130-6) may be the base stations # 1 to # 3. 120-1 to 120-3. The transport nodes # 7 130-7 may be connected to the core network, the controller 140, and the like, and each of the transport nodes # 10 through # 12 (130-10 through 130-12) may be a base station # 4 through # 6 (120-4). To 120-6).

The controller 140 may be connected to the transport network and control the operation of the plurality of transmission nodes 130-1 to 130-12 included in the transport network. The controller 140 may be referred to as an "exhole controller" or "crosshole controller" and may support software defined network (SDN) technology. For example, the controller 140 may perform a setting operation of a communication path, a control operation for packet transmission and reception in a transport network using an SDN-based flow control protocol.

The core network can be connected to the transport network and can communicate with the access network via the transport network. When the core network is an evolved packet core (EPC) network, the core node 150 included in the core network may include a mobility management entity (MME), a serving-gateway (S-GW), and a packet data network (P-GW). -gateway) and the like. When the core network supports a cloud-radio access network (C-RAN), the core node 150 may be a base band unit (BBU) or the like. The BBU may indicate a "BBU pool."

Meanwhile, a communication node included in the transport network shown in FIG. 1 may be configured as follows.

2 is a block diagram showing a first embodiment of a communication node constituting a transport network.

Referring to FIG. 2, the communication node 200 includes a plurality of terminals 110-1 to 110-8, a plurality of base stations 120-1 to 120-6, and a plurality of transmission nodes shown in FIG. 1. 130-1 to 130-12, the controller 140, the core node 150, and the like. The communication node 200 may include at least one processor 210, a memory 220, and a transmission / reception apparatus 230 connected to a network to perform communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

3 is a flowchart showing a first embodiment of a communication method in a transport network.

Referring to FIG. 3, the controller 140 and the transmission nodes # 1 to # 6 (130-1 to 130-6) are the controller 140 and the transmission nodes # 1 to # 6 (130-1 to # 130) of FIG. 1. -6). The controller 140 may be configured as follows.

4 is a block diagram illustrating a first embodiment of a controller in a transport network.

Referring to FIG. 4, the controller 140 may include a communication path manager 141 and a communication path evaluator 144. The communication path manager 141 may include a communication path controller 142 and an SDN controller 143.

The communication path evaluator 144 performs a resource state evaluator 145, a channel evaluator 146, a network evaluator 147, a quality of service (QoS) evaluator 148, and a communication path calculator 149. It may include.

The communication path manager 141 and the communication path evaluator 144 may receive the transmission data unit information from the end transmission node. The communication path evaluator 144 may receive information necessary for determining a final communication path from a plurality of transmission nodes.

The communication path manager 144 may receive a candidate communication path from the communication path manager 141. The resource state evaluator 145 may determine the overall resource state indicator based on the information necessary for determining the final communication path. The channel evaluator 146 may determine the overall channel quality indicator based on the information necessary for determining the final communication path.

The network evaluator 147 may determine the overall network status indicator based on the information necessary for determining the final communication path. The QoS controller 148 may determine the final communication path among the preliminary final communication paths in consideration of service provider information indicating service priority of the service provider transmitting the transmission data unit.

The communication path calculator 149 may be connected to the resource state evaluator 145, the channel evaluator 146, the network evaluator 147, and the QoS controller 148. The communication path calculator 149 may receive the entire resource status indicator from the resource status evaluator 145.

The communication path calculator 149 may receive the entire channel quality indicator from the channel evaluator 146. The communication path calculator 149 may receive the entire network status indicator from the network evaluator 147.

The communication path calculator 149 may determine the final communication path based on the overall resource status indicator, the overall channel quality indicator, the overall network status indicator, the operator information, and the like.

The communication path controller 142 may be connected to the SDN controller 143. The communication path controller 142 may generate a flow rule so that a transmission data unit can be transmitted through a plurality of transmission nodes located in the final communication path, and transmit the generated flow rule to the SDN controller 143.

For example, when communication path 3 is determined as the final communication path among a plurality of candidate communication paths (communication paths 1, 2,... N), the communication path manager 141 may determine a flow rule corresponding to the communication path 3. It may generate and transmit the generated flow rule to the SDN controller 143.

The SDN controller 143 may transmit a flow rule to a plurality of communication paths located in the final communication path. The SDN controller 143 may control the transmission data unit to be transmitted to the plurality of transmission nodes configured as the final communication path based on the flow rule.

The plurality of configurations included in the controller 140 may not be physical configurations. That is, the plurality of components included in the controller 140 may mean a logical configuration divided according to a plurality of functions performed in the controller 140.

Referring back to FIG. 3, the transmitting node # 1 130-1 may transmit the source information and the destination information of the transmitting data unit to the controller 140 (S300). The controller 140 may receive source information and destination information from the transmitting node # 1 130-1 (S300).

The controller 140 may determine the source transmission node and the destination transmission node of the transmission data unit in the transport network based on the source information and the destination information.

The controller 140 may set a plurality of candidate communication paths based on the source transmission node and the destination transmission node information of the transmission data unit (S301). In detail, the controller 140 may set a plurality of communication paths including a source transmission node and a destination transmission node of the transmission data unit as a plurality of candidate communication paths.

For example, in the case of FIG. 1, the transmission node # 1 130-1 may receive a transmission data unit from the core node 150. Transport node # 1 130-1 may be a source transport node of a transport data unit. If the destination of the transmission data unit is the base station # 1 120-1, the transmission node # 4 130-4 may be a destination transmission node.

When the source transmitting node and the destination transmitting node are determined to be the transmitting node # 1 130-1 and the transmitting node # 4 130-4, respectively, the controller 140 communicates with the communication path 1 130-1, 130-2, 130-4 and communication path 2 (130-1, 130-3, 130-4) may be set as a plurality of candidate communication paths.

If the destination of the transmission data unit is base station # 2 120-2, transmission node # 5 130-5 may be a destination transmission node. When the source transmitting node and the destination transmitting node are determined to be the transmitting node # 1 130-1 and the transmitting node # 5 130-5, respectively, the controller 140 performs communication path 3 (130-1, 130-2, 130-5) and communication path 4 (130-1, 130-3, 130-5) may be set as a plurality of candidate communication paths.

If the destination of the transmission data unit is the base station # 3 (120-3), the transmission node # 6 (130-6) may be a destination transmission node. When the source transmitting node and the destination transmitting node are determined to be the transmitting node # 1 130-1 and the transmitting node # 6 130-6, respectively, the controller 140 transmits the communication paths 5 130-1, 130-3, 130-6) may be set as a candidate communication path.

The controller 140 may transmit a message requesting information necessary for determining the final communication path to the transmitting nodes # 1 to # 6 (130-1 to 130-6) (S302). Information necessary for determining the final communication path may include a resource status indicator, a channel quality indicator, and a network status indicator. The resource status indicator may indicate a utilization rate of resources at the transmitting node.

The channel quality indicator may indicate each channel state obtained through the transmission nodes # 1 to # 6 (130-1 to 130-6). The network status indicator may indicate the congestion degree of each transmitting node obtained through the transmitting nodes # 1 to # 6 (130-1 to 130-6).

The transmitting nodes # 1 to # 6 (130-1 to 130-6) may calculate resource status indicators, channel quality indicators, and network status indicators, which are information necessary for determining the final communication path, for each node (S303). The resource status indicator may indicate a utilization rate of a resource at the transmitting node, and the utilization rate of the resource may be calculated based on the following equation.

The total resource size of the transmitting node may indicate a resource available at the transmitting node. The resource size used may indicate the resource actually being used (e.g., resources occupied for transmission of the transmission data unit).

The channel quality indicator may be calculated based on the received signal strength of the signal transmitted and received through the transmission nodes # 1 to # 6 (130-1 to 130-6). For example, the channel quality indicator may be calculated by measuring the received signal strength transmitted and received through the channel set between the transmission nodes # 1 and # 2 130-1 and 130-2.

If the channel quality is good, the channel quality indicator may be set to a low value. The larger the channel quality indicator, the lower the transmission performance of the transmission data unit. The network state indicator may be calculated based on the retransmission situation, the buffering situation, the network congestion situation, etc. of the transmitting nodes # 1 to # 6 (130-1 to 130-6).

If the network condition is good, the network status indicator may be set to a low value. The transmitting nodes # 1 to # 6 (130-1 to 130-6) may transmit a response message including information necessary for determining the final communication path to the controller 140 (S304).

The controller 140 may receive a response message including information necessary for determining the final communication path from the transmitting nodes # 1 to # 6 (130-1 to 130-6) (S304).

The controller 140 may determine the final communication path based on the response message received from the transmitting nodes # 1 to # 6 (130-1 to 130-6) (S305). A process of determining the final communication path based on the information necessary for determining the final communication path may be as follows.

The controller 140 may determine the overall resource status indicator, the overall channel quality indicator, and the overall network status indicator required for determining the final communication path based on the information included in the response message.

In detail, the controller 140 may determine all resource status indicators by adding all resource status indicators indicating resource utilization rates of a plurality of transmission nodes included in the communication path.

For example, the resource state indicator of communication path 1 may be determined by adding resource state indicators of transmission nodes belonging to candidate communication path 1. The overall resource status indicator can be expressed by the following equation.

는 전체 자원 상태 지시자를 지시할 수 있다.

는 임의의 통신 경로를 지시할 수 있다.

는 임의의 전송 노드를 지시할 수 있다.

는 통신 경로

에 위치한 전송 노드

의 무선 자원 가중치를 지시할 수 있다.

May indicate an overall resource status indicator.

May indicate any communication path.

May indicate any transmitting node.

Communication path

Transport node located at

May indicate a radio resource weight of.

는 통신 경로

에 포함된 전송 노드

의 무선 자원 활용률을 지시할 수 있다. 구체적으로,

는 통신 경로

에 포함된 전송 노드

의 자원 크기 대비 통신 경로

로 전송되는 전송 데이터 유닛에 의해 점유되는 자원 크기의 비율을 지시할 수 있다.

Communication path

Transport nodes contained in

It may indicate the radio resource utilization rate of. Specifically,

Communication path

Transport nodes contained in

Communication paths relative to resource size

It can indicate the ratio of the resource size occupied by the transmission data unit to be transmitted to.

For example, assume that the sizes of transmission data units transmitted on communication path 3 (130-1, 130-2, 130-5) and communication path 4 (130-1, 130-3, 130-5) are the same. When the size of the resource of the transmitting node # 2 130-2 is greater than the size of the resource of the transmitting node # 3 130-3, the resource status indicator of the transmitting node # 2 130-2 is transmitted to the transmitting node # 3. It may be smaller than the resource status indicator of 130-3. The larger the resource status indicator may reduce the transmission performance of the transmission data unit.

에 포함된 복수의 전송 노드들을 통해 획득된 각각의 채널 상태를 지시하는 채널 품질 지시자를 모두 더하여 전체 채널 품질 지시자를 결정할 수 있다. Controller 140 is a communication path

The total channel quality indicator may be determined by adding all of the channel quality indicators indicating the respective channel states obtained through the plurality of transmission nodes.

Communication path 1 130-1, 130-2, and 130-4 may include a communication obstacle 144. The communication obstacle 144 may include an obstacle that may interfere with communication such as a mountain, a forest, and a tall building. The communication obstacle 144 may affect the channel quality indicator indicating the state of the channel. In more detail, the overall channel quality indicator may be expressed by the following equation.

는 전체 채널 품질 지시자를 지시할 수 있다.

는 통신 경로

에 포함된 전송 노드

와 통신 경로

에 포함된 전송 노드

와 연결된 전송 노드 사이의 채널 상태를 지시할 수 있다.

May indicate a full channel quality indicator.

Communication path

Transport nodes contained in

And communication path

Transport nodes contained in

It may indicate a channel state between the transport node and the connected transport node.

는 통신 경로

에 포함된 복수의 전송 노드들 전체 채널 상태를 지시할 수 있다. 채널 품질 지시자가 높을수록 전송 데이터 유닛의 전송 성능이 감소할 수 있다.

Communication path

It may indicate the overall channel state of the plurality of transmission nodes included in. The higher the channel quality indicator, the lower the transmission performance of the transmission data unit.

Communication path 1 (130-1, 130-2, 130-4) and communication path 3 (130-1, 130-2, 130-5) are transport nodes # 1, # 2 (130-1, 130-2). May include in common. The transmitting node # 2 130-2 may simultaneously transmit and receive a plurality of transmission data units having different destinations.

Communication Path 2 (130-1, 130-3, 130-4), Communication Path 4 (130-1, 130-3, 130-5) and Communication Path 5 (130-1, 130-3, 130-6) May include transport node # 3 130-3 in common. The transmission node # 3 130-3 may simultaneously transmit and receive a plurality of transmission data units having different destinations.

Assuming that the sizes of the transmission data units transmitted in each communication path are the same, the transmission node # 3 130-3 simultaneously transmits and receives two transmission data units having different destinations at the same time. The network state indicator indicating the congestion degree of the communication path may be higher than that of the transmitting node # 2 130-2 transmitting and receiving. In more detail, the network status indicator may be expressed by the following equation.

는 전체 네트워크 상태 지시자를 지시할 수 있다.

는 통신 경로

에 포함된 전송 노드

가 전송 데이터 유닛을 전송할 때 발생할 수 있는 재전송 상황, 버퍼링 상황, 네트워크 혼잡 상황 등을 지시할 수 있다.

May indicate the overall network status indicator.

Communication path

Transport nodes contained in

May indicate a retransmission situation, a buffering situation, a network congestion situation, and the like that may occur when transmitting a transmission data unit.

는 통신 경로

에 포함된 복수의 전송 노드들 전체의 네트워크 상태 지시자를 지시할 수 있다. 네트워크 상태 지시자가 높을수록 전송 데이터 유닛의 전송 성능이 감소할 수 있다. 통신 경로

의 통신 경로 효율성은 다음과 같은 수학식으로 표현될 수 있다.

Communication path

It may indicate a network status indicator of all the plurality of transmission nodes included in. The higher the network status indicator, the lower the transmission performance of the transmission data unit. Communication path

The communication path efficiency of can be expressed by the following equation.

의 통신 경로 효율성은 통신 경로

의 전체 자원 상태 지시자, 전체 채널 품질 지시자, 전체 네트워크 상태 지시자의 합으로 결정될 수 있다. 최종 통신 경로는 다음과 같은 수학식으로 표현될 수 있다. 통신 경로 효율성 값이 낮을수록 전송 데이터 유닛의 전송 성능이 증가할 수 있다.Communication path

Communication path efficiency of communication path

It can be determined by the sum of the total resource status indicator, the full channel quality indicator, and the overall network status indicator of. The final communication path may be represented by the following equation. The lower the communication path efficiency value, the higher the transmission performance of the transmission data unit can be.

은 복수의 후보 통신 경로들 중 통신 경로 효율성이 최소인 통신 경로를 지시할 수 있다.The controller 140 may determine a communication path having the minimum communication path efficiency among the plurality of candidate communication paths as the final communication path.

May indicate a communication path having a minimum communication path efficiency among the plurality of candidate communication paths.

The controller 140 may determine the preliminary final communication paths of a predetermined number of communication paths having a low communication path efficiency among the plurality of candidate communication paths.

The controller 140 may determine a final communication path among a predetermined number of preliminary final communication paths by further considering service provider information indicating service priority of a service provider transmitting the transmission data unit. In detail, the transmission data unit may include carrier information, and a quality of service may be determined based on the carrier information.

For example, when the service priority of the operator transmitting the transmission data unit is 1, the controller 140 may determine a final communication path having a communication path efficiency of 1 among the plurality of preliminary final communication paths.

When the service priority of the operator transmitting the transmission data unit is 2, the controller 140 may determine a final communication path having a communication path efficiency of 2 among the plurality of preliminary final communication paths.

 The controller 140 may generate a flow rule that is a rule for transmitting the transmission data unit through the plurality of transmission nodes determined as the final communication path (S306). The flow rule may be a rule for determining a plurality of transmitting nodes to which the transmitting data unit is transmitted.

If the controller 140 sets communication path 3 (130-1, 130-2, 130-5) as the final transmission node among the plurality of candidate communication paths, the controller 140 is communication path 3 (130-). The flow rules may be transmitted to the transmission nodes # 1, # 2, and # 5 (130-1, 130-2, and 130-5) included in 1, 130-2, and 130-5 (S307). Transport nodes # 1, # 2, # 5 (130-1, 130-2, 130-5) included in communication path 3 (130-1, 130-2, 130-5) are flow rules from the controller 140. Can be received (S307)

The transmitting node # 1 130-1 included in the communication path 3 (130-1, 130-2, 130-5) receiving the flow rule may transmit the transmitting data unit to the transmitting node # 2 130-2. There is (S308). Upon receiving the transmission data unit from the transmission node # 1 130-1, the transmission node # 2 130-2 may transmit the transmission data unit to the transmission node # 5 130-5 (S309).

After receiving the transmission data unit from the transmission node # 2 130-2, the transmission node # 5 130-5 may transmit the transmission data unit to the base station # 2 120-2. The base station # 2 120-2 may transmit a transmission data unit to the terminals # 2 and # 3 (110-2, 110-3).

The methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software.

Examples of computer readable media include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (19)

A method for controlling a communication path of a controller in a transport network,
Transmitting a request message for requesting information necessary for determining a final communication path to a plurality of transmitting nodes included in the transport network;
In response to the request message, receiving a response message including information necessary for determining the final communication path;
The final communication path is determined among a plurality of predetermined candidate communication paths based on the total resource status indicator, the total channel quality indicator, and the overall network status indicator required for determining the final communication path determined based on the information included in the response message. Making; And
Transmitting information of the final communication path to a plurality of transmission nodes included in the final communication path. The method according to claim 1,
Wherein the final communication path is determined as a candidate communication path in which a sum of a plurality of resource state indicators, a plurality of channel quality indicators, and a plurality of network state indicators of a plurality of transmission nodes among the plurality of candidate communication paths is minimized. Path control method. The method according to claim 1,
The total resource status indicator is determined by adding all resource status indicators indicating a utilization rate of resources in a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method according to claim 1,
Wherein the overall channel quality indicator is determined by adding all channel quality indicators indicating respective channel states obtained through a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method according to claim 1,
The overall network status indicator is determined by adding all network status indicators indicating congestion of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method according to claim 1,
And the final communication path is further determined in consideration of the service priority of the operator transmitting the transmission data unit. The method according to claim 1,
And wherein the information of the final communication path includes a flow rule which is a rule for transmitting a transmission data unit through a plurality of transmission nodes included in the final communication path. The method according to claim 1,
The plurality of candidate communication paths are determined from among a plurality of communication paths including a source communication node and a destination communication node determined based on source and destination information of a transmission data unit received from an end transport node included in the transport network. Communication path control method. As a controller for communication path control in a transport network,
A processor; And
At least one instruction executed by the processor includes a memory (memory),
The at least one command is
Transmitting a request message for requesting information necessary for determining a final communication path to a plurality of transmitting nodes included in the transport network;
In response to the request message, receives a response message including information necessary for determining the final communication path,
The final communication path is determined among a plurality of predetermined candidate communication paths based on the total resource status indicator, the total channel quality indicator, and the overall network status indicator required for determining the final communication path determined based on the information included in the response message. And
And transmit information of the final communication path to a plurality of transmitting nodes included in the final communication path. The method according to claim 9,
Wherein the final communication path is determined as a candidate communication path in which a sum of a plurality of resource status indicators, a plurality of channel quality indicators, and a plurality of network status indicators of a plurality of transmission nodes of the plurality of candidate communication paths is minimum; . The method according to claim 9,
The overall resource status indicator is determined by adding all resource status indicators indicating a utilization rate of resources in a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method according to claim 9,
Wherein the overall channel quality indicator is determined by adding all channel quality indicators indicating respective channel states obtained through a plurality of transmission nodes included in a particular candidate communication path among the plurality of candidate communication paths. The method according to claim 9,
Wherein the overall network status indicator is determined by adding all network status indicators indicating congestion of a plurality of transmission nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method according to claim 9,
Wherein the final communication path is determined further taking into account the service priority of the operator transmitting the transmission data unit. The method according to claim 9,
And wherein the information of the final communication path includes a flow rule that is a rule for transmitting a transmission data unit through a plurality of transmission nodes included in the final communication path. The method according to claim 9,
The plurality of candidate communication paths are determined from among a plurality of communication paths including a source communication node and a destination communication node determined based on source and destination information of a transmission data unit received from an end transport node included in the transport network. Controller. A method of operating a transport node included in a transport network,
Sending a message to a controller comprising source and destination information of the transmission data unit;
Receiving a request message requesting information necessary for determining a final communication path from the controller;
In response to the request message, sending a response message including information necessary for determining the final communication path to the controller;
Receiving final communication path information from the controller; And
Transmitting a transmission data unit based on the last communication path information. The method according to claim 17,
The information necessary for determining the final communication path includes a resource state indicator indicating a utilization rate of resources in a plurality of transmission nodes included in a specific candidate communication path among a plurality of candidate communication paths, and a plurality of transmission nodes included in the specific candidate communication path. And a channel quality indicator indicating each channel state obtained through the network, and a network status indicator indicating a congestion degree of a plurality of transmission nodes included in the specific candidate communication path. The method according to claim 17,
And wherein the information of the final communication path includes a flow rule that is a rule for transmitting the transmission data unit through a plurality of transmission nodes included in the final communication path.

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