JP2016119562A - Network system and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer an aggregated control signal by determining the position of an aggregation node having a mediator.SOLUTION: In a network system in which a plurality of nodes are connected in the shape of a ring, and a specific node determines an allocation band in accordance with an information amount of each node, generates a second control signal including the allocation band information, and notifies each node of the second control signal, a part or the whole of each node aggregates a first control signal transmitted by a node to be aggregated and its own node, and can set a mediator for transmitting the first control signal as a first aggregation control signal to the specific node, the specific node determines an aggregation node for setting a mediator, and includes means for performing control for starting the function of a mediator of the node, and the aggregation node transmits the first aggregation control signal obtained by aggregating the first control signals transmitted by the nodes to be aggregated and the own node toward the specific node.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a network system using a TDM (Time Division Multiplexing) method and a control method thereof.

  In the TDM network system, efficient management of network resources is enabled by allocating a band (time slot: TS) to each path so as to follow actual traffic. Note that a path is defined by a combination of a transmission source, a destination, a path priority, and the like (Non-Patent Document 1).

  In the PON system shown in FIG. 8, the OLT (subscriber terminal device), which is a higher-level device, collects traffic information from ONUs (subscriber devices), which are lower-level devices, and DBA (dynamic band allocation based on the traffic information of each ONU. ) A bandwidth (TS) to be allocated to each ONU is determined by control, and notified from the OLT to each ONU. Each ONU performs data transfer in a band (TS) allocated from the OLT.

  In the PON system, a protocol called MPCP is used for exchanging control signals for collecting traffic information and notifying allocated bands, and a dedicated channel (band resources for control signals) is exclusively reserved for each node. Is done.

  In the ring network system shown in FIG. 9, a large number of nodes 1 to 4 are connected in a loop via an optical fiber cable, and the control unit of each node forwards a control signal including traffic information of the own node to a specific node 1. Then, the bandwidth allocation control unit of the specific node 1 determines the bandwidth (TS) allocated to the path of each node 2 to 4, generates a control signal including the allocation bandwidth information, and controls the control unit of each node 2 to 4 Send to. The control units of the nodes 2 to 4 perform data transfer in the allocated band (TS) based on the information of the control signal addressed to the own node.

  An example of the TS table for control signals in the ring network system shown in FIG. 9 is shown in FIG. The time slots for transmitting a control signal from the node 2 to the node 13 to the specific node 1 that performs band allocation control are assumed to be TS1 to TS12. At this time, if attention is paid to the link between the node 13 and the node 1, for example, a bandwidth of 12TS is required.

M.Jinno, H.Takara, B.Kozicki, Y.Tsukishima, Y.Sone, and S.Matsuoka, "Spectrum-Efficient and Scalable Elastic Optical Path Network: Architecture, Benefits, and Enabling Technologies," IEEE Commun.Mag. , Vol.47, Issue 11, pp.66-73,2009

  In bandwidth allocation control, by increasing the collection frequency of traffic information from a lower level device (ONU or node) to a higher level device (OLT or specific node), it becomes possible to allocate bandwidth with high accuracy and increase the use efficiency of network resources. be able to. However, in a large-scale network, as the number of lower-level devices increases, the bandwidth load of the control signal for collecting traffic information increases, so an efficient control signal transmission form is required. As one of the methods, a method of consolidating paths for transferring control signals (traffic information) using a mediator (intermediate aggregation device) is considered.

  In addition, in the network system in which the PON system shown in FIG. 8 is configured in a multistage connection, the nodes that relay control signals are fixed, and all the nodes that serve as connection points play a role of relay. Functions need to be deployed and run on many nodes. On the other hand, in the ring network system shown in FIG. 9 and FIG. 10, the position of the aggregation node having the mediator can be arbitrarily set, but the mediator can be arranged at a position to increase the use efficiency of the network resource, and the network environment can be changed. It is desirable that the arrangement position can be dynamically changed according to the situation.

  An object of the present invention is to provide a network system capable of determining the position of an aggregation node for setting a mediator and efficiently transferring an aggregated control signal, and a control method therefor.

  In the first invention, a plurality of nodes are connected in a ring shape, each node excluding the specific node transmits a first control signal including an amount of information corresponding to the number of paths to the specific node, and the specific node In a network system that determines a band to be allocated to each according to the amount of information, generates a second control signal including the allocated band information, and notifies each node, a part or all of each node is an aggregation target node (Hereinafter referred to as an aggregated node) and a configuration in which a first control signal transmitted by the own node is aggregated and a mediator configured to transmit to the specific node as the first aggregated control signal can be set. A node for determining a node to be set (hereinafter referred to as an aggregation node) and controlling the activation of the mediator function of the node is provided. And the node is configured to be transmitted to a specific node of the first aggregation control signal which integrates a first control signal to be transmitted.

  In the network system of the first invention, the specific node is configured to determine, as an aggregation node, a node at which the deviation of the aggregation node and the number of nodes to be aggregated at the specific node or the deviation of the aggregate information amount is equal to or less than a threshold value.

  In the network system of the first invention, the specific node includes means for transmitting a second aggregation control signal in which the allocated band information of a predetermined node is aggregated to the aggregation node, and the aggregation node includes the second aggregation Means for dividing and transferring the control signal into second control signals of the corresponding predetermined nodes, respectively.

  In the network system of the first invention, the specific node is a node upstream of the transmission direction of the control signal, out of the two nodes having the maximum propagation delay between the nodes.

  In the second invention, a plurality of nodes are connected in a ring shape, each node excluding the specific node transmits a first control signal including an amount of information corresponding to the number of paths to the specific node, and the specific node In a network system control method for determining a bandwidth to be allocated to each according to the amount of information, generating a second control signal including the allocated bandwidth information and notifying each node, a part or all of each node is aggregated The target node (aggregated node) and the first control signal transmitted by the own node are aggregated, and a mediator configured to transmit to the specific node as the first aggregated control signal can be set. The node to be set (aggregation node) is determined and control is performed to activate the function of the mediator of the node. The aggregation node transmits the aggregated node and the own node. The first aggregation control signal which integrates a first control signal and transmits it to the particular node.

  In the network system control method according to the second aspect of the present invention, the specific node determines, as an aggregation node, a node at which the deviation of the aggregation node and the number of nodes to be aggregated at the specific node or the deviation of the aggregate information amount is equal to or less than a threshold value.

  In the network system control method according to the second invention, the specific node transmits a second aggregation control signal obtained by aggregating the allocated bandwidth information of a predetermined node to the aggregation node, and the aggregation node performs the second aggregation. The control signal is divided and transferred to the second control signal of the corresponding predetermined node.

  In the control method of the network system according to the second aspect, the specific node is a node upstream of the transmission direction of the control signal, out of the two nodes having the maximum propagation delay between the nodes.

  In the present invention, by arranging the aggregation nodes in the network system to be equal by the control of the specific nodes, the control signals of the aggregated nodes can be efficiently aggregated and transferred to the specific nodes, and the use of network resources Efficiency can be increased. In addition, since the arrangement of the aggregation nodes can be dynamically changed by controlling the specific node, for example, it is possible to flexibly cope with a case where a path is increased or decreased or a failure such as a fiber break occurs.

It is a figure which shows the control signal transfer example 1 of the network system of this invention. It is a figure which shows the control signal transfer example 2 of the network system of this invention. It is a figure which shows the control signal transfer example 3 of the network system of this invention. It is a figure which shows the determination procedure example 1 of the aggregation node which sets a mediator. It is a figure which shows the determination procedure example 2 of the aggregation node which sets a mediator. It is a figure which shows the example of TS table for control signals. It is a figure which shows the structural example of a mediator. It is a figure which shows the example of control of a PON system. It is a figure which shows the example of control of a ring network system. It is a figure which shows the example of TS table for control signals of a ring network system.

FIG. 1 shows a control signal transfer example 1 of the network system of the present invention.
In FIG. 1, the network system has a configuration in which nodes 1 to 4 are connected in a loop. Here, the network system is described as a control signal that is transferred in only one direction as a one-way ring, but the control signal may be transferred in both directions as a bidirectional ring as shown in FIG.

  The nodes 1 to 4 collect the function of the bandwidth allocation control unit 21 that collects traffic information according to the number of paths of each node and performs DBA control, and a control signal including traffic information transmitted from other nodes. The function of the mediator 22 to be transferred and the function of the aggregation node setting unit 23 that activates the function of the mediator 22 and sets the aggregation node are provided. In the initial state, each function is not activated, and a corresponding function of a predetermined node is activated according to the following procedure. In FIG. 1, each functional unit in each node is omitted or indicated by a dotted line except for the activated one.

  Here, the function of the bandwidth allocation control unit 21 of an arbitrary node is activated to be a specific node, or the propagation delay time between each node of the network system is known, and the propagation delay between the nodes is maximized 2 Among the two nodes, the function of the bandwidth allocation control unit 21 of the upstream node with respect to the control signal transfer direction is activated to be a specific node. That is, the specific node is a node that collects traffic information according to the number of paths from other nodes and performs bandwidth allocation to each node, and does not need to transmit a control signal by itself. By setting the node having the longest propagation delay, the transfer completion time of the control signal from each node to the specific node can be minimized. The process of determining the specific node may be performed by a host device of each node or an arbitrary node. In the example of FIG. 1, node 1 is a specific node. The specific node 1 in which the function of the bandwidth allocation control unit 21 is activated collects traffic information corresponding to the number of paths from the other nodes 2 to 4 and performs bandwidth allocation to each node.

  Further, the specific node 1 activates the function of the aggregation node setting unit 23, determines an aggregation node from other nodes, and activates the function of the mediator 22. The number of aggregation nodes is determined in accordance with the scale of the network system, and they are determined to be “equal” as much as possible. The concept of “equal” and the determination method will be described later.

  Here, when the aggregation node setting unit 23 of the specific node 1 determines that the node 3 is an aggregation node and activates the function of the mediator 22 of the node 3, the node 2 becomes the aggregated node. The mediator 22 of the node 3 generates an aggregate control signal obtained by consolidating the traffic information transmitted from the node 2 and the traffic information of the own node, and transfers the aggregated control signal to the specific node 1. When the band allocation control unit 21 of the specific node 1 receives the aggregate control signal transmitted from the node 3, the band allocation control unit 21 decomposes and acquires the traffic information of the node 2 and the node 3. The node 4 transmits only its own traffic information to the specific node 1. The band allocation control unit 21 of the specific node 1 determines a band to be allocated according to the traffic information of each node, and transmits a control signal including the allocated band information to the nodes 2 to 4.

  Further, as a function of the mediator 22 set in the node 3, as shown in FIG. 2, the band allocation control unit 21 of the node 1 sends an aggregate control signal obtained by aggregating the allocated band information of the node 3 and the downstream node 4 to the node 3, the mediator 22 of the node 3 separates the aggregate control signal, terminates the control signal (allocation band) addressed to the own node, and relays and transfers the control signal (allocation band) addressed to the node 4. You may go. In other words, the mediator 22 in this case aggregates and links the traffic information of the node 2 (aggregated node) upstream of the transfer path and the traffic information of the own node and transmits the traffic information of the node 4 downstream of the transfer path. And a function of separating and relaying control signals (allocated bands).

  Further, as shown in FIG. 3, if the transfer direction of the control signal including the traffic information of each node is reversed from the transfer direction of the control signal including the allocated bandwidth information of each node, the mediator 22 of the node 3 The node 2 (aggregated node) where the traffic information is aggregated and the node 2 that divides and forwards the allocated bandwidth information are symmetrical, and processing of the control signal including the traffic information or the allocated bandwidth information in the bandwidth allocation control unit 21 of the node 1 Becomes easier.

Hereinafter, taking the ring network system shown in FIG. 10 as an example, a method of determining an aggregation node in which the aggregation node setting unit (23 shown in FIGS. 1 to 3) of the specific node 1 sets a mediator will be described.
FIG. 4 shows a procedure example 1 for determining an aggregation node for setting a mediator.
FIG. 5 shows a procedure example 2 for determining an aggregation node for setting a mediator.

  4 and 5, the aggregation node setting unit of the specific node 1 has the ring network node configuration information, the number of paths to be managed by each node, by the exchange with each node in advance or the setting from the host device. Assume that the information amount corresponding to the number of paths is stored in association with each other. The amount of information corresponding to the number of paths is the amount of traffic information to be notified to the specific node 1 having the bandwidth allocation control unit, and the required number of TSs required for the transfer and the allocated TS positions are associated with each other. Here, the information amount of each node is A × B, where the information amount per path is A byte (100 bytes in FIGS. 4 and 5) and the number of paths to be managed is B. The amount of information that can be stored in one TS is 3750 bytes.

  First, the aggregation node setting unit (23 shown in FIGS. 1 to 3) of the specific node 1 determines the number of aggregation nodes according to the scale of the ring network, and further makes the aggregation nodes “equal” on the ring network. Then, candidate nodes are determined based on the number of aggregated nodes. For example, when the number of nodes on the ring network is N, it is known that the value of the number of aggregated nodes + 1 (for a specific node) is appropriately about √N (the square root of N). This is because if the number of aggregation nodes is too large, the number of nodes to be aggregated decreases, while the aggregation control signal transferred from the aggregation node to the specific node increases and the aggregation efficiency decreases. As shown in FIGS. 4 and 5, if the total number of nodes is 13, √13≈3.6, and if the total number of aggregate nodes and specific nodes is 3, the number of aggregate nodes is 2. Next, since the total number of nodes (aggregated nodes) excluding the aggregation node and the specific node is 10, divide it into three, and arrange the aggregation nodes and specific nodes where the number of aggregated nodes is 3 or 4 Provisionally “equal”. When the total number of nodes shown in FIGS. 4 and 5 is 13 and the specific node 1, the nodes that are candidates for the aggregation node are the nodes 6 and 10, the nodes 5 and 9, and the nodes 5 and 10.

  In the example of FIG. 4, when the nodes 6 and 10 are aggregated nodes, the number of aggregated nodes of the node 6 is 4, and the information amount of the aggregated nodes 2, 3, 4, 5 and the node 6 is combined. The aggregate information amount is 3800 bytes, the number of aggregated nodes of node 10 is 3, the aggregate information amount of the aggregated information amount of aggregated nodes 7, 8, 9 and 10 is 2800 bytes, and aggregated information of node 1 The number of nodes is 3, and the total information amount of the information amounts of the nodes 11, 12, 13 and the node 1 is 2300 bytes. Note that the node 1 does not aggregate traffic information, but calculates the number of nodes to be aggregated and the amount of aggregated information for convenience. Here, since the aggregate information amount of the node 6 exceeds 3750 bytes of information amount that can be accommodated in one TS, 2 TS are required to transfer the aggregate control signal. Therefore, the allocation TS position of the control signal transmitted by each node is TS1 to TS7 as shown in FIG. 4 assuming that 1 TS is assigned to the mediator process in the aggregation node.

  In the example of FIG. 5, when the nodes 5 and 9 are aggregated nodes, the aggregated node count of the node 5 is 3 and the aggregated information amount is 2900 bytes as in the example of FIG. The number is 3 and the aggregate information amount is 3300 bytes, the number of aggregated nodes of node 1 is 4, and the aggregate information amount is 2700 bytes. Here, the aggregate information amount of the nodes 5 and 9 falls within 3750 bytes of the information amount that can be accommodated in one TS. Therefore, the allocation TS position of the control signal transmitted by each node is TS1 to TS6 as shown in FIG. 5 assuming that 1 TS is assigned to the mediator process in the aggregation node.

  Thus, the required number of TSs for the entire network is 7 TS in the case of FIG. 4 and 6 TS in the case of FIG. Therefore, as shown in FIG. 5, when the node 5 and the node 9 are determined as the aggregation nodes, the use efficiency of the network resource can be further increased.

  Further, a threshold may be set for the deviation in the number of nodes to be aggregated, the amount of aggregated information, and the deviation in the number of required TSs, and a combination of aggregation nodes that can obtain a deviation equal to or less than the threshold may be uniquely determined. For example, 1 is set as the threshold for deviation of the number of nodes to be aggregated, 400 is set as the threshold for deviation of the aggregated information amount, and 0 is set as the threshold for deviation of the required TS number.

  The deviation of the aggregated node numbers (4, 3, 3) in the nodes 6, 10, and 1 in FIG. 4 is 0.58, and the aggregated node numbers (3, 3) in the node 5, node 9, and node 1 in FIG. , 4) has a deviation of 0.58, and it can be seen that both deviations are equal to or smaller than the threshold value. The deviation of the aggregate information amount (3800, 2800, 2300) in the nodes 6, 10 and 1 in FIG. 4 is 764, and the aggregate information amount (2900, 3300, 2700) in the node 5, node 9 and node 1 in FIG. ) Is 306, and it can be seen that the deviation of the aggregate information amount in the combination of aggregate nodes in FIG. Further, the deviation of the required TS number (2, 1) in the node 6 and the node 10 in FIG. 4 is 0.71, and the deviation of the required TS number (1, 1) in the node 5 and the node 9 in FIG. It turns out that it is below the threshold value deviation of the required TS number in the combination of the aggregation nodes of FIG.

  As described above, a combination of aggregation nodes satisfying the above threshold condition was found in consideration of the deviation of the number of aggregated nodes, the amount of aggregated information, and the deviation of the required number of TSs as the equalization condition of the aggregation nodes for setting the mediator. At this point, it may be determined as an arrangement that increases the use efficiency of network resources. However, the method for calculating the optimal solution by performing the above calculation for all the aggregation node combinations is not practical because the calculation time increases rapidly with the scale of the network. For example, a predetermined number of candidates are selected based on the number of aggregated nodes. You may select and select those that minimize the deviation between the aggregate information amount and the required number of TSs.

  FIG. 6 shows a TS table for control signals when the nodes 5 and 9 shown in FIG. 5 are set as the aggregation node. The traffic information of the nodes to be aggregated 2 to 4 is transmitted to the aggregation node 5 by TS1 to TS3, aggregated including the traffic information of the aggregation node 5 by TS4, and has a band allocation control unit at TS5 as an aggregation control signal. Sent to node 1. The traffic information of the nodes 6 to 8 as the aggregated nodes is transmitted to the node 9 as the aggregation node in TS1 to TS3, and is aggregated including the traffic information of the node 9 in TS4, and is banded in TS6 as an aggregation control signal. It is transmitted toward the node 1 having the allocation control unit. The traffic information of the node 10 to the node 13 is transmitted to the node 1 having the band allocation control unit in TS1 to TS4, respectively.

  Here, focusing on the link between the node 13 and the node 1, the required bandwidth in the conventional configuration shown in FIG. 10 is 12TS, but the required bandwidth in the present invention shown in FIG. 6 is 6TS (even in the case of FIG. ), Which is a significant reduction. If this reduced TS portion is used for data communication, the amount of accommodated traffic can be increased. Alternatively, if the reduced TS portion is used again for traffic information collection, the collection frequency for the same resource amount can be increased.

FIG. 7 shows a configuration example of the mediator. Here, a mediator set in the node 9 in FIG. 6 will be described as an example.
In FIG. 7, the control unit 31 of the mediator of the node 9 transmits the control signal transmitted from the nodes 6 to 8 to the TS1 to TS3 according to the TS table 32 in which the control signal information shown in FIG. An aggregation control signal obtained by aggregating its own control signal is transmitted to node 1 by TS6, and the aggregation control signal transmitted from node 5 to TS5 is passed through and transmitted to node 1. Specifically, it is executed by the following configuration.

  An optical signal branched from the optical transmission line connecting the nodes is input to the mediator. The optical signal is separated into a control signal wavelength and a data signal wavelength by the wavelength filter 33, and an optical signal having the control signal wavelength is input to the optical switch 34. The optical switch 34 separates and outputs the control signals of the nodes 6 to 8 transmitted from the TS1 to TS3 and the aggregated control signal of the node 5 transmitted from the TS5 under the TDM control of the control unit 31. The control signals of the nodes 6 to 8 are converted into electrical signals by the optical / electrical converter 35 and stored in the buffer 36. The aggregation processing unit 37 outputs an aggregation control signal obtained by aggregating the control signals of the nodes 6 to 8 accumulated in the buffer 36 and the control signal of the node 9 itself under the control of the control unit 31. The aggregate control signal is converted into an optical signal by the electrical / optical converter 38 and input to the optical switch 39. The optical switch 39 outputs the aggregated control signal of the node 9 input from the electrical / optical converter 38 by TS6 under the TDM control of the control unit 31, and outputs the aggregated control signal of the node 5 input from the optical switch 34 by TS5. Each of them is sent to the optical transmission line. That is, the aggregation control signal of the node 5 is output from the optical switch 34 to the optical transmission line via the optical switch 39 in TS5.

  The optical switches 34 and 39 shown here are assumed to be 1 × 2 switches, but may be configured by using three on / off optical switches using SOA (Semiconductor Optical Amplifier) and two optical couplers. be able to.

  In the above description, the specific node is determined as the initial setting, and the specific node determines the aggregation node according to the amount of information of each node. However, each node can be a specific node and an aggregation node. 21 functions, mediator 22 functions, and aggregation node setting unit 23 functions, it is also possible to dynamically change specific nodes and aggregation nodes.

  Cases in which a specific node is dynamically changed include when a node is increased or decreased or when a failure occurs. When node increase / decrease is performed, since the propagation delay between the nodes changes, the link having the maximum propagation delay may change. In this case, redesign is performed with the above algorithm, and the deployment position of the specific node is determined. In addition, when a failure occurs, for example, when a fiber break occurs, there is a node that needs to change the direction in which the control signal is sent, and it may be better to change the deployment position of the specific node so far. Redesign.

  Cases in which the aggregate node is dynamically changed include when a path is increased or decreased or when a failure occurs. When path increase / decrease is performed, the amount of traffic information to be transmitted by each node changes, so redesign is performed and the deployment position of the aggregation node is determined. In addition, when a failure such as a fiber break occurs, there may be a node that needs to change the direction in which the control signal is sent, and it may be better to change the deployment position of the previous aggregation node. Do.

  Further, the function of the bandwidth allocation control unit 21, the function of the mediator 22, and the function of the aggregation node setting unit 23 may not be deployed to all nodes, but may be deployed only for a node having a large amount of traffic, for example. . When each functional unit is arranged in only some of the nodes as described above, it is necessary to consider in the design calculation for determining the specific node and the aggregation node.

1 to 13 Node 21 Bandwidth allocation control unit 22 Mediator 23 Aggregated node setting unit 31 Control unit 32 TS table 33 Wavelength filter 34, 39 Optical switch 35 Optical / electrical converter (O / E)
36 Buffer 37 Aggregation Processing Unit 38 Electric / Optical Converter (E / O)

Claims (8)

A plurality of nodes are connected in a ring shape, and each node except the specific node transmits a first control signal including an amount of information corresponding to the number of paths to the specific node, and the specific node corresponds to the information amount of each node. In a network system that determines a bandwidth to be allocated to the network, generates a second control signal including the allocated bandwidth information, and notifies each node,
Part or all of each of the nodes aggregates the aggregation target node (hereinafter referred to as an aggregated node) and the first control signal transmitted by the own node, and transmits the aggregated first control signal to the specific node as a first aggregated control signal To configure the mediator to be
The specific node includes means for determining a node for setting the mediator (hereinafter referred to as an aggregation node) and performing control for starting the function of the mediator of the node,
The network node is configured to transmit the first aggregated control signal obtained by aggregating the first control signal transmitted by the aggregated node and the own node toward the specific node. . The network system according to claim 1,
The network system is characterized in that the specific node is configured to determine, as the aggregate node, a node whose aggregate node and a deviation of the number of aggregated nodes in the specific node, or a deviation of the aggregate information amount is a threshold value or less. . The network system according to claim 1,
The specific node includes means for transmitting, to the aggregation node, a second aggregation control signal in which the allocated band information of a predetermined node is aggregated,
The said aggregation node is provided with the means to divide | segment and transfer the said 2nd aggregation control signal to the said 2nd control signal of the respectively corresponding predetermined | prescribed node. The network system characterized by the above-mentioned. The network system according to claim 1,
The specific node is a node upstream of a transmission direction of a control signal, out of two nodes having a maximum propagation delay between the nodes. A plurality of nodes are connected in a ring shape, and each node except the specific node transmits a first control signal including an amount of information corresponding to the number of paths to the specific node, and the specific node corresponds to the information amount of each node. In a network system control method for determining a bandwidth to be allocated to a node, generating a second control signal including the allocated bandwidth information and notifying each node,
Part or all of each of the nodes aggregates the aggregation target node (hereinafter referred to as an aggregated node) and the first control signal transmitted by the own node, and transmits the aggregated first control signal to the specific node as a first aggregated control signal To configure the mediator to be
The specific node determines a node for setting the mediator (hereinafter referred to as an aggregation node), and performs control to activate the function of the mediator of the node,
The aggregation node transmits the first aggregation control signal obtained by aggregating the first control signal transmitted by the aggregated node and the own node toward the specific node. . In the network system control method according to claim 5,
The network node control method, wherein the specific node determines, as the aggregate node, a node in which the aggregate node and a deviation in the number of aggregated nodes in the specific node, or a deviation in the aggregate information amount is a threshold value or less. . In the network system control method according to claim 5,
The specific node transmits, to the aggregation node, a second aggregation control signal in which allocated bandwidth information of a predetermined node is aggregated,
The network node control method, wherein the aggregation node divides and transfers the second aggregation control signal to the second control signal of a corresponding predetermined node. In the network system control method according to claim 5,
The specific node is a node upstream of the transmission direction of the control signal, out of the two nodes having the maximum propagation delay between the nodes.

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