KR20180106182A - Method for controlling communication path in transport network and apparatus for the same - Google Patents

Abstract

A method for controlling a communication path by a communication path control server is disclosed. The method includes: a step of determining the resource status indicator of a plurality of transport nodes; a step of determining a channel quality indicator; a step of determining a network status indicator; and a step of determining a final communication path based on the resource status indicator, the channel quality indicator, and the network status indicator. Therefore, a transmission path can be effectively controlled in the wired/wireless integrated network.

Description

TECHNICAL FIELD [0001] The present invention relates to a communication path control method and apparatus for a communication path in a transport network,

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.

An increase in mobile packets due to an increase in the number of mobile communication subscribers and the spread of a smart phone makes it possible to increase the number of mobile packets through an existing communication network (for example, a communication network using limited radio resources) May not be easy to handle. In order to solve this problem, a small cell technology or the like may be introduced into a communication network. When a small cell technology is introduced to a communication network, a mobile packet 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 the service network) to the cell also increases. Therefore, a transport network for efficiently transmitting the increased packets will be required . Particularly, a transport network for efficiently transmitting and receiving packets such as a fronthaul, a midhaul, and a backhaul in a cloud-radio access network (C-RAN) will be required. The transport network may be referred to as an " Xhaul transport network "or a" crosshaul transport network ".

A transport network may support communication between a base station (or a radio unit (RU), a remote radio head (RRH), etc.) and a core network (or a base band unit (BBU) And may include a plurality of transmitting nodes for transmitting. Here, the BBU may be a " BBU pool ". Communication between transport nodes included in a transport network may be accomplished using wired communication technology (e.g., optical communication technology, Ethernet technology, etc.) or wireless communication technology (e.g., mmWave (millimeter wave) .

Communication path control in a transport network (hereinafter referred to as "wired transport network") where wired communication technology is used is generally performed by a centralized flow control protocol based on SDN (Software Defined Network) . In a transport network (hereinafter referred to as "wireless transport network") where wireless communication technology is used, communication path control may be technically different from communication path control in a wired transport network. Thus, when a communication path determination method defined for a wired transport network is used to determine an optimal communication path in a wireless transport network, it may be difficult to determine an optimal communication path.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for searching and determining an optimal communication path in a wired / wireless communication based transport network.

According to an aspect of the present invention, there is provided a method of controlling a communication path of a controller in a transport network, the method comprising: determining a final communication route to a plurality of transmission nodes included in the transport network; Transmitting a request message requesting necessary information; Receiving, in response to the request message, a response message including information necessary for the final communication path determination; Determining the final communication path among a plurality of candidate communication paths predetermined based on the total resource status indicator, the total channel quality indicator, and the total network status indicator necessary for determining the final communication path determined based on the information included in the response message; ; 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 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 among the plurality of candidate communication paths is minimum have.

Here, the overall resource status indicator may be 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.

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

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

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

Here, the information on 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.

Wherein 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 source and destination information of the transmission data unit received from an end transmission node included in the transport network Can be determined.

According to an aspect of the present invention, there is provided a controller for communication path control in a transport network, the controller comprising: a processor; And a memory in which at least one command executed through the processor is stored, wherein the at least one command is a command to transmit the source and destination information of a transmission data unit received from an end transmission node included in the transport network Establishing a plurality of candidate communication paths based on the plurality of transmission nodes and transmitting a request message requesting information necessary for final communication path determination to a plurality of transmission nodes included in the transport network; Receiving, in response to the request message, a response message including information necessary for the final communication path determination; and determining, based on the information included in the response message, an overall resource status indicator, Determining an overall network status indicator, determining the final communication path among the plurality of candidate communication paths based on the overall resource status indicator, the overall channel quality indicator, the overall network status indicator, And to transmit information of the path to a plurality of transmission nodes included in the final communication path.

Here, the final communication path may be determined 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 determined as a candidate communication path having a minimum sum May be executable.

Here, the overall resource status indicator may be executable to be 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.

Here, the overall channel quality indicator may be executable to be determined by adding all the channel quality indicators indicating the respective channel states obtained through the plurality of transmission nodes included in the 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 a congestion level 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 so as to further determine a service priority of a carrier transmitting the transmission data unit.

Here, the information of the final communication path may be executable to 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.

Wherein 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 source and destination information of the transmission data unit received from an end transmission node included in the transport network Or < / RTI >

According to another aspect of the present invention, there is provided a method of operating a transport node included in a transport network, the method comprising: a processor; And a memory in which at least one command executed through the processor is stored, wherein the at least one command is a command for requesting a plurality of transport nodes included in the transport network to request information necessary for final communication path determination In response to the request message, a response message including information necessary for the final communication path determination, and for transmitting the request message to the mobile station in response to the request message, Determining the final communication path from among a plurality of candidate communication paths predetermined based on the total resource status indicator, the total channel quality indicator, and the overall network status indicator, and transmitting the information of the final communication path to a plurality Lt; RTI ID = 0.0 > of < / RTI >

Transmitting a message including a source and destination information of the transmission data unit to a controller; Receiving a request message from the controller requesting information necessary for final communication path determination; Transmitting, in response to the request message, a response message including information necessary for the final communication path determination to the controller; Receiving final communication path information from the controller; And transmitting the transmission data unit based on the final communication path information.

Here, the information necessary for determining the final communication path may include a resource status indicator 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, a plurality of A channel quality indicator indicating each channel state obtained through the transmission nodes of the specific candidate communication path, and a network status indicator indicating the congestion of the plurality of transmission nodes included in the specific candidate communication path.

Here, the information on 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 a transmission delay time that can occur in a transport network. In addition, packet loss that may occur in the transport network can be reduced, and transmission reliability can be enhanced. The quality of the transmission service can be further improved by reducing the transmission delay time and improving the transmission reliability.

1 is a conceptual diagram showing 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 showing a first embodiment of a controller in a transport network.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. 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 a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations 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 to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

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

1 is a conceptual diagram showing 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 to 110-8 may be connected to the plurality of base stations 120-1 to 120-6 and may be connected to the terminals 110-1 to 110-8 and the plurality of base stations 120-1 to 120- 120-6) can be used for 4G communication technology (for example, long term evolution (LTE) communication technology, LTE-A (advanced) communication technology specified in 3rd generation partnership project (3GPP) For example, a millimeter wave (mmWave) based communication technology, a new radio (NR) communication technology, or the like.

The transport network may support communication between the access network and the core network. For example, the transport network may transmit packets (e.g., control packets, data packets) received from the access network to the core network and may transmit 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 transport nodes 130-1 through 130-12. Communication between the 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) . For example, communication between the transmission nodes # 1 to # 6 (130-1 to 130-6) can be performed using a wireless communication technique, and transmission nodes # 7 to # 12 (130-7 to 130-12) May be performed using wired communication technology.

Operations (e.g., transmission and reception of packets) of a plurality of transmission nodes 130-1 to 130-12 included in the transport network can be controlled by the controller 140. [ The controller 140 may be included in a transport network. Alternatively, the controller 140 may be configured separately from the transport network. Among the plurality of transmission nodes 130-1 to 130-12, an end-point transmission node may be connected to an access network, a core network, a controller 140, and the like. For example, the transmission node # 1 130-1 may be connected to the core network, the controller 140, and the transmission nodes # 4 through # 6 130-4 through 130-6 may be connected to the base stations # (120-1 to 120-3). The transmission node # 7 130-7 may be connected to the core network, the controller 140, and the transmission nodes # 10 through # 12 130-10 through 130-12 may be connected to the base stations # 4 through # 6 120-4 To 120-6.

The controller 140 may be connected to the transport network and may control operations of a plurality of transport nodes 130-1 to 130-12 included in the transport network. Controller 140 may be referred to as an " x-hole controller "or a" cross hole controller " and may support SDN (software defined network) technology. For example, the controller 140 can perform a communication path setting operation, a packet transmission / reception control operation, and the like 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 includes a mobility management entity (MME), a serving gateway (S-GW), a packet data network (PDN) -gateway < / RTI > If 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. &Quot;

Meanwhile, the 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.

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, a plurality of transmission nodes (130-1 to 130-12), a controller (140), a core node (150), and the like. The communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to the network to perform communication. 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 and 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 in accordance with embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be constituted of at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may comprise at least one of read-only memory (ROM) and random access memory (RAM).

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

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

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

Referring to FIG. 4, the controller 140 may include a communication path management unit 141 and a communication path evaluation unit 144. The communication path management unit 141 may include a communication path control unit 142 and an SDN control unit 143. [

The communication path evaluating unit 144 includes a resource state evaluating unit 145, a channel evaluating unit 146, a network evaluating unit 147, a QoS (quality of service) evaluating unit 148 and a communication path calculating unit 149 .

The communication path management unit 141 and the communication path evaluation unit 144 can receive the transmission data unit information from the terminal transmission node. The communication path evaluation unit 144 can receive information necessary for final communication path determination from a plurality of transmission nodes.

The communication path management unit 144 can receive the candidate communication path from the communication path management unit 141. [ The resource status evaluation unit 145 can determine the entire resource status indicator based on the information necessary for determining the final communication path. The channel estimator 146 may determine the overall channel quality indicator based on the information required for the final communication path determination.

The network evaluator 147 can determine the overall network status indicator based on the information required for the final communication path determination. The QoS control unit 148 may determine the final communication path among the preliminary final communication paths considering the carrier information indicating the service priority of the carrier transmitting the transmission data unit.

The communication path calculation unit 149 may be connected to the resource status evaluation unit 145, the channel evaluation unit 146, the network evaluation unit 147, and the QoS control unit 148. The communication path calculator 149 can receive the entire resource status indicator from the resource status evaluator 145. [

The communication path calculation section 149 can receive the entire channel quality indicator from the channel evaluation section 146. [ The communication path calculation unit 149 can receive the entire network status indicator from the network evaluation unit 147. [

The communication path calculator 149 can determine the final communication path based on the total resource status indicator, the total channel quality indicator, the total network status indicator, the provider information, and the like.

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

For example, when the communication path 3 among the plurality of candidate communication paths (communication paths 1, 2, ..., n) is determined as the final communication path, the communication path management section 141 sets the flow rule corresponding to the communication path 3 as And can transmit the generated flow rule to the SDN control unit 143. [

The SDN control unit 143 can transmit a flow rule to a plurality of communication paths located in the final communication path. The SDN control unit 143 can control the transmission data unit to be transmitted to a plurality of transmission nodes set in 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 configurations included in the controller 140 may mean a logical configuration that is divided according to a plurality of functions performed by the controller 140. [

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

The controller 140 may determine the source and destination transport nodes of the transport 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). Specifically, 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 to 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. The transmission node # 1 130-1 may be a source transmission node of the transmission 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 the destination transmission node.

When the source and destination transit nodes are established as the transmission node # 1 130-1 and the transmission node # 4 130-4, the controller 140 transmits the communication route 1 (130-1, 130-2, 130-4 and the communication paths 2 (130-1, 130-3, 130-4) to a plurality of candidate communication paths.

If the destination of the transmission data unit is the base station # 2 120-2, the transmission node # 5 130-5 may be the destination transmission node. When the source and destination nodes are determined as the source node # 1 130-1 and the destination node # 5 130-5, respectively, the controller 140 determines that the communication route 3 (130-1, 130-2, 130-5 and the communication paths 4 (130-1, 130-3, 130-5) to 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 the destination transmission node. When the source and destination transit nodes are determined as the transmission node # 1 130-1 and the transmission node # 6 130-6, respectively, the controller 140 controls the communication paths 5-1, 130-6 can be set as candidate communication paths.

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

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

The transmission nodes # 1 to # 6 (130-1 to 130-6) can calculate a resource status indicator, a channel quality indicator, and a network status indicator, which are information necessary for final communication path determination, at each node (S303). The resource status indicator may indicate the utilization rate of the 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 the available resources at the transmitting node. The resource size used may indicate the resource in actual use (e.g., the resource 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 / received through the transmission nodes # 1 to # 6 (130-1 to 130-6). For example, the channel quality indicator can be calculated by measuring the received signal strength transmitted / received through the channel set between the transmission nodes # 1 and # 2 (130-1, 130-2).

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

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

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

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

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

Specifically, the controller 140 may determine the entire resource status indicator by adding all of the resource status indicators indicating the resource utilization rate at the plurality of transmission nodes included in the communication path.

For example, the resource status indicator of communication path 1 can be determined by adding a resource status indicator of the transmission nodes belonging to candidate communication path 1. The entire 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.

Can indicate the entire resource status indicator.

Lt; / RTI > may indicate an arbitrary communication path.

Lt; / RTI > may point to any transport node.

The communication path

Lt; / RTI >

Lt; RTI ID = 0.0 > a < / RTI >

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.

The communication path

Lt; RTI ID = 0.0 >

The radio resource utilization rate of the mobile station. Specifically,

The communication path

Lt; RTI ID = 0.0 >

The communication path to the resource size of

Lt; RTI ID = 0.0 > a < / RTI >

For example, it is assumed that the sizes of transmission data units transmitted to communication paths 3 (130-1, 130-2, 130-5) and communication paths 4 (130-1, 130-3, 130-5) When the size of the resource of the transmission node # 2 130-2 is larger than the size of the resource of the transmission node # 3 130-3, the resource status indicator of the transmission node # May be smaller than the resource status indicator of the resource manager 130-3. The larger the resource status indicator, the lower 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. The controller 140 controls the communication path

The channel quality indicator indicating each channel state obtained through the plurality of transmission nodes included in the channel quality indicator may be added to determine the overall channel quality indicator.

Communication obstacles 144 may be included in communication paths 1 (130-1, 130-2, 130-4). Communication obstacles 144 may include obstacles that may interfere with communication, such as mountains, forests, and high-rise buildings. The communication obstacle 144 may affect the channel quality indicator indicating the state of the channel. Specifically, the overall channel quality indicator can 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.

Lt; RTI ID = 0.0 > quality indicator. ≪ / RTI >

The communication path

Lt; RTI ID = 0.0 >

And communication path

Lt; RTI ID = 0.0 >

Lt; RTI ID = 0.0 > and / or < / RTI >

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.

The communication path

To indicate the total channel state of a plurality of transport nodes included in the transport channel. The higher the channel quality indicator, the lower the transmission performance of the transmission data unit.

The communication paths 1 (130-1, 130-2 and 130-4) and the communication paths 3 (130-1, 130-2 and 130-5) are connected to the transmission nodes # 1 and # Can be commonly included. The transmitting node # 2 (130-2) can simultaneously transmit and receive a plurality of transmission data units having different destinations.

The communication paths 2 130-1, 130-3 and 130-4, the communication paths 4 130-1, 130-3 and 130-5 and the communication paths 5 130-1, 130-3 and 130-6, 3 # 1 130-3 may be commonly included. And the transmission node # 3 130-3 can simultaneously transmit and receive a plurality of transmission data units having different destinations.

Assuming that the sizes of the transmission data units transmitted to the respective communication paths are the same, the transmission node # 3 130-3 transmits and receives two transmission data units having different destinations simultaneously because the destination transmits and receives three different transmission data units at the same time The network status indicator indicating the congestion degree of the communication path may be higher than the transmission node # 2 (130-2) transmitting / receiving. Specifically, the network status indicator can 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.

Lt; / RTI > may indicate the overall network status indicator.

The communication path

Lt; RTI ID = 0.0 >

A buffering state, a network congestion state, and the like that may occur when a transmission data unit is transmitted.

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.

The communication path

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

The communication path efficiency of the communication path 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

The communication path efficiency of the communication path &

The total resource quality indicator, the total resource quality indicator, and the total network quality indicator. The final communication path can be expressed by the following equation. The lower the value of the communication path efficiency, the greater the transmission performance of the transmission data unit.

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

May indicate a communication path with the least communication path efficiency among the plurality of candidate communication paths.

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

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

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

The controller 140 can determine the final communication path of communication path efficiency 2 among the plurality of preliminary final communication paths when the service priority of the carrier transmitting the transmission data unit is two.

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

If the controller 140 sets the communication path 3 (130-1, 130-2, 130-5) among the plurality of candidate communication paths as the final transmission node, the controller 140 controls the communication path 3 (130- 1, 130-2, and 130-5 to the transmission nodes # 1, # 2, and # 5 (130-1, 130-2, and 130-5) (S307). The transmission nodes # 1, # 2, and # 5 (130-1, 130-2, and 130-5) included in the communication paths 3 (130-1, 130-2, (S307)

The transmission node # 1 130-1 included in the communication path 3 (130-1, 130-2, 130-5) receiving the flow rule can transmit the transmission data unit to the transmission node # 2 (130-2) (S308). The transmission node # 2 130-2 having received the transmission data unit from the transmission node # 1 130-1 can transmit the transmission data unit to the transmission node # 5 130-5 (S309).

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

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

Examples of computer readable media include hardware devices that are specially 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 those produced by the compiler 1, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (19)

A communication path control method of a controller in a transport network,
Transmitting a request message to a plurality of transport nodes included in the transport network to request information necessary for final communication path determination;
Receiving, in response to the request message, a response message including information necessary for the final communication path determination;
Determining the final communication path among a plurality of candidate communication paths predetermined based on the total resource status indicator, the total channel quality indicator, and the total network status indicator necessary for determining the final communication path determined based on the information included in the response message; ; And
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 by 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 among the plurality of candidate communication paths is a minimum Path control method. The method according to claim 1,
Wherein 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,
Wherein the overall network status indicator is determined by adding all network status indicators indicating a congestion level 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,
Wherein the final communication path is determined by further considering a service priority of a carrier transmitting the transmission data unit. The method according to claim 1,
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 1,
The plurality of candidate communication paths are determined among a plurality of communication paths including a source communication node and a destination communication node determined based on a source and destination information of a transmission data unit received from an end transmission node included in the transport network Lt; / RTI > A controller for communication path control in a transport network,
A processor; And
Wherein at least one instruction executed through the processor includes a memory,
Wherein the at least one instruction comprises:
Transmitting a request message for requesting information necessary for final communication path determination to a plurality of transport nodes included in the transport network,
Receiving, in response to the request message, a response message including information necessary for the final communication path determination,
Determining the final communication path among a plurality of candidate communication paths predetermined based on the total resource status indicator, the total channel quality indicator, and the total network status indicator necessary for determining the final communication path determined based on the information included in the response message; And
And to transmit information of the final communication path to a plurality of transmission nodes included in the final communication path. The method of claim 9,
Wherein the final communication path is determined by a candidate communication path with a minimum 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. . The method of claim 9,
Wherein the overall resource status indicator is determined by adding all resource status indicators indicating a utilization rate of resources at a plurality of transport nodes included in a specific candidate communication path among the plurality of candidate communication paths. The method of claim 9,
Wherein the overall channel quality indicator is determined by adding all of the 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 of claim 9,
Wherein the overall network status indicator is determined by adding all network status indicators indicating the congestion of a plurality of transport nodes included in a particular candidate communication path among the plurality of candidate communication paths. The method of claim 9,
Wherein the last communication path is determined by further considering a service priority of a carrier transmitting the transmission data unit. The method of claim 9,
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 of claim 9,
The plurality of candidate communication paths are determined among a plurality of communication paths including a source communication node and a destination communication node determined based on a source and destination information of a transmission data unit received from an end transmission node included in the transport network Lt; / RTI > A method of operating a transport node included in the transport network,
Transmitting a message including a source and destination information of the transmission data unit to a controller;
Receiving a request message from the controller requesting information necessary for final communication path determination;
Transmitting, in response to the request message, a response message including information necessary for the final communication path determination to the controller;
Receiving final communication path information from the controller; And
And transmitting a transmission data unit based on the final communication path information. 18. The method of claim 17,
Wherein the information required for determining the final communication path includes a resource status indicator 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, A channel quality indicator indicating a respective channel state obtained through the nodes, and a network status indicator indicating a congestion level of a plurality of transmission nodes included in the specific candidate communication path. 18. The method of claim 17,
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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