Communication system, management and control device, and control method

Abstract

This communication system comprises: one or more wireless stations that perform wireless communication with one or more terminals; a plurality of distributed stations that are connected directly or through other devices to the one or more wireless stations; a cooperation information collection unit that acquires cooperation information indicative of the state of communication between the plurality of distributed stations and the one or more terminals at a prescribed period; an optical path switching control unit that, when it is determined that it is necessary to switch optical paths between the one or more wireless stations and the plurality of distributed stations on the basis of the cooperation information, controls switching of the optical paths between the one or more wireless stations and the plurality of distributed stations; and a sleep control unit that shifts a distributed station capable of sleep to a sleep state after the optical path switching is performed.　

Description

[Technical Field]

[0001] The present invention relates to a communication system, a management and control device, and a control method. [Background technology]

[0002] In conventional communication systems that perform wireless communication between terminals and base stations, each base station calculates the throughput and automates the system to enter sleep mode when the throughput exceeds a threshold, thereby saving power. In such communication systems, terminals connected to a sleeping base station are instructed to hand over to the base station with the highest throughput. This allows the terminal to continue communicating. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Yong Sheng Soh, Tony QSQuek, and Marios Kountouris, “Dynamic Sleep Mode Strategies in Energy Efficient Cellular Networks”, IEEE, Communications Theory, pp.3131 3136, June 2013. [Overview of the project] [Problems that the invention aims to solve]

[0004] However, in conventional communication systems, terminals connected to a sleep base station may be handed over to a base station already connected to many other terminals, potentially leading to a deterioration in communication quality. Furthermore, in conventional communication systems, each base station autonomously decides whether or not to enter sleep mode, which can prevent overall optimization and limit the effectiveness of power saving.

[0005] In view of the above circumstances, the present invention aims to provide a technology that can significantly reduce power consumption without degrading communication quality. [Means for solving the problem]

[0006] One aspect of the present invention is a communication system comprising: one or more radio stations that communicate wirelessly with one or more terminals; a plurality of distributed stations connected directly or via other devices to the one or more radio stations; a cooperation information collection unit that acquires cooperation information indicating the communication status between the plurality of distributed stations and the one or more terminals at predetermined intervals; an optical path switching control unit that controls the switching of the optical path between the one or more radio stations and the plurality of distributed stations when it is determined that switching of the optical path between the one or more radio stations and the plurality of distributed stations is necessary based on the cooperation information; and a sleep control unit that puts distributed stations capable of going into sleep mode into sleep mode after the optical path has been switched.

[0007] One aspect of the present invention is a management control device comprising: a plurality of distributed stations connected directly or via other devices to one or more radio stations that perform wireless communication with one or more terminals; a cooperation information collection unit that acquires cooperation information indicating the status of communication between the one or more terminals at predetermined intervals; an analysis unit that determines whether switching of optical paths and sleep control between the one or more radio stations and the plurality of distributed stations are necessary based on the cooperation information; an optical path switching control unit that controls the switching of optical paths between the one or more radio stations and the plurality of distributed stations when it is determined that switching of optical paths between the one or more radio stations and the plurality of distributed stations is necessary; and a sleep control unit that puts distributed stations capable of sleep into a sleep state after the optical path switching has been performed.

[0008] One aspect of the present invention is a control method which acquires, at predetermined intervals, cooperation information indicating the communication status between one or more distributed stations connected directly or via other devices to one or more radio stations that communicate wirelessly with one or more terminals, and the one or more terminals, and when it is determined that switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary based on the cooperation information, controls the switching of the optical path between the one or more radio stations and the multiple distributed stations, and after the optical path switching has been performed, puts distributed stations that can enter sleep mode into a sleep state. [Effects of the Invention]

[0009] This invention makes it possible to significantly reduce power consumption without degrading communication quality. [Brief explanation of the drawing]

[0010] [Figure 1] This diagram illustrates the overall configuration and processing overview of the mobile network system in the present invention. [Figure 2] This figure shows an example configuration of a mobile network system in the first embodiment. [Figure 3] This flowchart shows an example of the sleep process flow executed by the management control device in the first embodiment. [Figure 4] This flowchart shows an example of the sleep process flow executed by the management control device in the first embodiment. [Figure 5] This sequence diagram shows an example of a detailed flow of the sleep process performed by the mobile network system in the first embodiment. [Figure 6] This flowchart shows an example of the sleep wake-up process performed by the management control device in the first embodiment. [Figure 7] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by the mobile network system in the first embodiment. [Figure 8] This figure shows an example of the configuration of a mobile network system in a modified version of the first embodiment. [Figure 9]This figure shows an example of the configuration of a mobile network system in a modified version of the first embodiment. [Figure 10] This sequence diagram shows an example of a detailed flow of the sleep process performed by a mobile network system in a modified version of the first embodiment. [Figure 11] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by a mobile network system in a modified version of the first embodiment. [Figure 12] This figure shows an example configuration of a mobile network system in the second embodiment. [Figure 13] This flowchart shows an example of the sleep process flow executed by the management control device in the second embodiment. [Figure 14] This flowchart shows an example of the sleep process flow executed by the management control device in the second embodiment. [Figure 15] This sequence diagram shows an example of a detailed flow of the sleep process performed by the mobile network system in the second embodiment. [Figure 16] This flowchart shows an example of the sleep wake-up process performed by the management control device in the second embodiment. [Figure 17] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by the mobile network system in the second embodiment. [Figure 18] This sequence diagram shows an example of a detailed flow of the sleep process performed by a mobile network system in a modified version of the second embodiment. [Figure 19] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by a mobile network system in a modified version of the second embodiment. [Figure 20] This flowchart shows an example of the sleep process flow executed by the management control device in the third embodiment. [Figure 21] This flowchart shows an example of the sleep process flow executed by the management control device in the third embodiment. [Figure 22]This sequence diagram shows an example of a detailed flow of the sleep process performed by the mobile network system in the third embodiment. [Figure 23] This flowchart shows an example of the sleep wake-up process performed by the management control device in the third embodiment. [Figure 24] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by the mobile network system in the third embodiment. [Figure 25] This sequence diagram shows an example of a detailed flow of the sleep process performed by a mobile network system in a modified example of the third embodiment. [Figure 26] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by a mobile network system in a modified example of the third embodiment. [Figure 27] This figure shows an example configuration of a mobile network system in the fourth embodiment. [Figure 28] This flowchart shows an example of the sleep process flow executed by the management control device in the fourth embodiment. [Figure 29] This flowchart shows an example of the sleep process flow executed by the management control device in the fourth embodiment. [Figure 30] This sequence diagram shows an example of a detailed flow of the sleep process performed by the mobile network system in the fourth embodiment. [Figure 31] This flowchart shows an example of the sleep wake-up process performed by the management control device in the fourth embodiment. [Figure 32] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by the mobile network system in the fourth embodiment. [Figure 33] This sequence diagram shows an example of a detailed flow of the sleep process performed by a mobile network system in a modified version of the fourth embodiment. [Figure 34] This sequence diagram shows an example of a detailed flow of the sleep wake-up process performed by a mobile network system in a modified version of the fourth embodiment. [Modes for carrying out the invention]

[0011] One embodiment of the present invention will be described below with reference to the drawings. (Overall structure and processing overview) Figure 1 is a diagram illustrating the overall configuration and processing overview of the mobile network system in the present invention. First, the overall configuration of the mobile network system will be described. The mobile network system is an example of a communication system. The mobile network system is, for example, a fifth-generation mobile communication system (hereinafter referred to as "5G"). The mobile network system comprises one or more radio stations 12, a switching device 13, a plurality of distributed stations 14, an aggregation station 15, a core device 16, and a management control device 20.

[0012] The following connections are made via optical fibers that transmit optical signals: between the radio station 12 and the switching device 13, between the switching device 13 and the distributed stations 14, between the distributed stations 14 and the aggregation station 15, and between the aggregation station 15 and the core device 16. The following connections are made via electrical wires or optical fibers that transmit electrical signals: between the switching device 13 and the management control device 20, and between the distributed stations 14 and the management control device 20. The example shown in Figure 1 shows a case where there are four radio stations 12 and two distributed stations 14. Note that there may be multiple switching devices 13, but the following explanation will use the case of one device as an example.

[0013] Each radio station 12 is equipped with one or more antennas and communicates wirelessly with the terminal 11. For example, each radio station 12 receives a signal transmitted from the terminal 11 and transmits the received signal to the distributed station 14 connected via the switching device 13. Each radio station 12 transmits the received signal to the terminal 11 via the switching device 13. A radio station 12 is, for example, a Radio Unit (RU) in the 5G communication standard.

[0014] The switching device 13 is installed between the radio station 12 and the distributed station 14. The switching device 13 switches the optical path according to instructions from the management control device 20. An optical path is a path for optical signals. By switching the optical path, the switching device 13 switches the connection between the radio station 12 and the distributed station 14.

[0015] The distributed station 14 receives the uplink signal transmitted by the radio station 12 via the switching device 13. The distributed station 14 transmits the downlink signal to the radio station 12 via the switching device 13. The uplink signal is the signal transmitted by the terminal 11, and the downlink signal is the signal destined for the terminal 11. Each distributed station 14 transitions to a sleep state according to instructions from the management control device 20. The sleep state is a state in which power saving is possible by disabling some functions. The distributed station 14 is, for example, a DU (Distributed Unit) in the 5G communication standard. The information that the management control device 20 obtains from the distributed stations 14 is called cooperation information. Cooperation information is information that indicates the status of communication between each distributed station 14 and the terminal 11.

[0016] The coordination information includes, for example, information on the number of terminals 11 that can be accommodated by each distributed station 14 (hereinafter referred to as "number of accommodated terminals"). The coordination information includes, for example, information on the maximum number of accommodated terminals of the distributed station 14. The maximum number of accommodated terminals of the distributed station 14 is the maximum number that the distributed station 14 can accommodate. The coordination information includes, for example, information on the radio stations 12 to which the optical path distributed station 14 is connected (hereinafter referred to as "connected radio station information"). The coordination information includes, for example, information on the processing load of the distributed station 14 (hereinafter referred to as "processing load information"). The processing load information may be, for example, information on the memory usage rate of the distributed station 14 or information on the CPU (Central Processing Unit) usage rate. The coordination information includes, for example, information on the processing delay for each distributed station 14 (hereinafter referred to as "processing delay information"). The coordination information includes, for example, information on the transmission delay between terminal 11 and each distributed station 14 (hereinafter referred to as "delay information").

[0017] The aggregation station 15 aggregates the uplink signals transmitted by each distributed station 14. The aggregation station 15 distributes the downlink signals. The aggregation station 15 is, for example, a CU (Centralized Unit) in the 5G communication standard.

[0018] The core device 16 performs signal processing on the uplink signals aggregated by the aggregation station 15. The core device 16 transmits the resulting signals to the external network. The core device 16 receives signals from the external network.

[0019] The core device 16 performs predetermined signal processing on signals received from an external network. The core device 16 transmits the resulting signal as a downlink signal to the aggregation station 15. The signal processing is, for example, the transfer of user data in the UPF (User Plane Function) of the 5G core network.

[0020] The management control device 20 acquires coordination information from the distributed station 14. Based on the acquired coordination information, the management control device 20 determines whether optical path switching and sleep control are necessary. If the management control device 20 determines that optical path switching and sleep control are necessary, it performs optical path switching control processing and sleep control processing. Optical path switching control processing is the process of switching the optical path between the radio station 12 and the distributed station 14. For example, the management control device 20 instructs the switching device 13 to control the switching of the optical path between the radio station 12 and the distributed station 14. Sleep control processing is the process of executing or waking the distributed station 14 from sleep.

[0021] Next, I will explain the overview of the mobile network system's processing. The upper diagram in Figure 1 shows the connection status of the mobile network system before the optical path switchover, and the lower diagram in Figure 1 shows the connection status of the mobile network system after the optical path switchover. The upper diagram in Figure 1 shows an example where radio stations 12-1 and 12-2 are connected to distributed station 14-1, and radio stations 12-3 and 12-4 are connected to distributed station 14-2.

[0022] The management control device 20 determines whether or not to perform optical path switching control processing based on the coordination information collected from each distributed station 14. The management control device 20 determines to perform optical path switching control processing if there is a distributed station 14 that can transition to a sleep state. A distributed station 14 that can transition to a sleep state is, for example, a distributed station 14 that does not contain a terminal 11.

[0023] On the other hand, the management control device 20 determines that it will not perform optical path switching control processing if there are no distributed stations 14 that can transition to sleep mode. If the management control device 20 determines that it will perform optical path switching control processing, it instructs the switching device 13 to switch the optical path. The switching device 13 switches the optical path between the radio station 12 and the distributed stations 14 according to the instructions from the management control device 20. After the optical path switching is complete, the switching device 13 notifies the management control device 20 that the optical path switching is complete.

[0024] When the management control device 20 receives notification from the switching device 13 that the optical path switching is complete, it sends a sleep permission notification to the distributed stations 14 that are ready to enter sleep mode. The sleep permission notification is a signal that includes instructions to put the distributed stations 14 into sleep mode. As a result, the distributed stations 14 that are ready to enter sleep mode enter sleep mode.

[0025] The lower diagram in Figure 1 shows an example where radio stations 12-1 to 12-4 are connected to distributed station 14-1, and distributed station 14-2 has entered a sleep state. In this way, the mobile NW system 100 puts a distributed station 14 that can enter a sleep state into a sleep state by having a terminal 11 connected to a distributed station 14 that can enter a sleep state connect to another distributed station 14, based on the coordination information collected from each distributed station 14. Hereinafter, the distributed station 14 that can enter a sleep state will be referred to as the source distributed station, and the distributed station 14 that becomes the new connection destination for the terminal 11 connected to the source distributed station will be referred to as the destination distributed station.

[0026] (First embodiment) Figure 2 shows an example configuration of the mobile network system 100 in the first embodiment. The mobile network system 100 in the first embodiment includes one or more radio stations 12, a switching device 13, a plurality of distributed stations 14, an aggregation station 15, a core device 16, and a management control device 20. The radio stations 12, switching device 13, distributed stations 14, aggregation station 15, and core device 16 were explained in Figure 1, so their explanation is omitted here. The management control device 20 includes a collaborative information collection unit 21, an analysis unit 22, and a control unit 23.

[0027] The collaborative information collection unit 21 includes an acquisition unit 211. The acquisition unit 211 collects collaborative information from the distributed stations 14 at predetermined intervals.

[0028] The analysis unit 22 comprises a cooperation information storage unit 221 and a real-time analysis unit 222. The cooperation information storage unit 221 records the collected cooperation information in a predetermined storage device. The real-time analysis unit 222 analyzes the communication status between each distributed station 14 and the terminal 11, such as the amount of change in the number of connections of the distributed stations 14 per unit time, based on the cooperation information. Specifically, the real-time analysis unit 222 determines whether or not optical path switching and sleep control are necessary based on the cooperation information.

[0029] For example, the real-time analysis unit 222 determines that optical path switching and sleep control are necessary if all terminals 11 accommodated by the source distributed station can be accommodated by another distributed station 14. In this case, the real-time analysis unit 222 notifies the control unit 23 of information indicating the destination distributed station 14 for the optical path switching and information indicating the distributed station 14 to be put into sleep mode.

[0030] For example, the real-time analysis unit 222 determines that switching of the optical path and sleep control are necessary when the number of terminals 11 accommodated by the distributed station 14 exceeds the maximum number of terminals. In this case, the real-time analysis unit 222 notifies the control unit 23 of information indicating the distributed station 14 to which the optical path will be switched, and information indicating the distributed station 14 to which sleep mode will be disabled.

[0031] The control unit 23 includes an optical path switching control unit 231 and a sleep control unit 232. The optical path switching control unit 231 determines the distributed station 14 to which the optical path will be switched based on the analysis results of the real-time analysis unit 322, and instructs the switching device 13 to switch the optical path. For example, the optical path switching control unit 231 determines the distributed station 14 to which the optical path will be switched based on information indicating the distributed station 14 to which the optical path will be switched, which is notified by the real-time analysis unit 222.

[0032] The sleep control unit 232 instructs the distributed station 14 to either enter or exit sleep mode based on the analysis results of the real-time analysis unit 322.

[0033] Figure 3 is a flowchart showing an example of the sleep process flow executed by the management control device 20 in the first embodiment. In Figure 3, the example is explained in which the cooperation information includes at least the number of terminals accommodated by each distributed station 14 and the maximum number of terminals accommodated. The process flow in Figure 3 is executed repeatedly at a predetermined cycle.

[0034] The acquisition unit 211 acquires cooperation information from each distributed station 14 (step S101). The acquisition unit 211 stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221 (step S102). The real-time analysis unit 222 calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S103). Here, the number of additional terminals that can be accommodated represents the number of additional terminals 11 that can be accommodated in addition to the number of terminals currently accommodated by the distributed station 14. For example, the number of additional terminals that can be accommodated can be obtained by subtracting the number of currently accommodated terminals from the maximum number of accommodated terminals.

[0035] The real-time analysis unit 222 determines whether the first switching condition has been met (step S104). The first switching condition is a condition indicating that a switch in the optical path between the radio station 12 and the distributed station 14 is necessary, for example, that the number of additional terminals that a certain distributed station 14 can accommodate is greater than the number of terminals that the distributed station 14 subject to sleep determination can accommodate.

[0036] If the real-time analysis unit 222 determines that the first switching condition has been met (step S104-YES), it notifies the control unit 23 of an optical path switching instruction and a sleep control instruction. Based on the optical path switching instruction notified by the real-time analysis unit 222, the optical path switching control unit 231 instructs the switching device 13 to switch the optical path of the radio station 12 connected to the source distributed station (step S105). Specifically, the optical path switching control unit 231 instructs the optical path of the radio station 12 connected to the source distributed station to be directed towards the destination distributed station.

[0037] The sleep control unit 232 transmits a sleep permission notification to the source distributed station (step S106). For example, the sleep control unit 232 may transmit a sleep instruction to the source distributed station when it receives an optical path switching completion notification from the radio station 12 connected to the source distributed station and the destination distributed station. The optical path switching completion notification is a signal that includes information indicating that the optical path switching has been completed. This allows the source distributed station to enter sleep mode.

[0038] In step S104, if the real-time analysis unit 222 determines that the first switching condition is not met (step S104-NO), it determines whether there are other distributed stations 14 (step S107). Other distributed stations 14 are, for example, distributed stations 14 that have not been compared with the distributed station 14 that is the target of the sleep determination. If the real-time analysis unit 222 determines that there are no other distributed stations 14 (step S107-NO), it terminates the process.

[0039] On the other hand, if the real-time analysis unit 222 determines that there are other distributed stations 14 (step S107-YES), it selects information on the number of additional terminals that can be accommodated by the other distributed stations 14 (step S108). Using the selected information on the number of additional terminals that can be accommodated by the other distributed stations 14, the real-time analysis unit 222 executes the process in step S104 again.

[0040] Figure 4 is a flowchart showing an example of the sleep process flow executed by the management control device 20 in the first embodiment. The process shown in Figure 4 is described in more detail as a more specific version of the process shown in Figure 3.

[0041] The acquisition unit 211 acquires information from each distributed station 14 as linked information, including the maximum number of terminals each distributed station can accommodate, information on connected radio stations, and the number of terminals each distributed station can accommodate (step S201).

[0042] The acquisition unit 211 stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221 (step S202). The real-time analysis unit 222 calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S203). Next, the real-time analysis unit 222 substitutes the value of 1 for the constant i (step S204). i represents, for example, the distributed station 14-i that will be the switching destination. If i=1, distributed station 14-1 becomes the switching destination distributed station. i is a value of 1≦i≦I. I is the total number of distributed stations 14.

[0043] Next, the real-time analysis unit 222 substitutes the value of (i + 1) for k (step S205). k represents, for example, the distributed station 14-k that is the source of switching. When k = 2 (i = 1), the distributed station 14-2 becomes the source distributed station. k takes a value such that 2 ≤ k ≤ K. K is the total number of distributed stations 14 - 1, that is, K = (I - 1).

[0044] After that, the real-time analysis unit 222 determines whether i U i - u k > u i is satisfied (step S206). U i represents the maximum number of terminals that can be accommodated in the distributed station 14-i, u k represents the number of terminals accommodated in the distributed station 14-i, and u i represents the number of terminals accommodated in the distributed station 14-k. The condition indicated by i U k - u > u is a specific example of the first switching condition. Here, as an example, assume that the maximum number of terminals that can be accommodated in the distributed station 14-1 is 1000, the number of terminals accommodated in the distributed station 14-1 is 100, the maximum number of terminals that can be accommodated in the distributed station 14-2 is 800, and the number of terminals accommodated in the distributed station 14-2 is 200.

[0045] When i = 1 and k = 2, it is expressed as follows. · U1 - u1 ⇒ 1000 - 100 = 9OO

[0046] Based on the above results, U1 - u1 > u2 means 900 > 200, and the first switching condition is satisfied. When the real-time analysis unit 222 determines that the first switching condition (for example, i U i - u k ) is satisfied (step S206 - YES), it notifies the control unit 23 of the optical path switching instruction and the sleep control instruction.

[0047] The optical path switching control unit 231 instructs the switching device 13 to switch the optical path of the radio station 12 connected to the distributed station 14-k based on the optical path switching instruction notified by the real-time analysis unit 222 (step S207). Specifically, the optical path switching control unit 231 instructs the optical path of the radio station 12 connected to the distributed station 14-k (e.g., distributed station 14-2) to be directed toward the destination distributed station 14-i (e.g., distributed station 14-1). The sleep control unit 232 sends a sleep permission notification to the distributed station 14-k (e.g., distributed station 14-2) (step S208).

[0048] On the other hand, consider, as an example, the case where the maximum number of terminals that distributed station 14-1 can accommodate is 1000, the number of terminals that distributed station 14-1 can accommodate is 500, the maximum number of terminals that distributed station 14-2 can accommodate is 800, and the number of terminals that distributed station 14-2 can accommodate is 700. When i=1 and k=2, it can be expressed as follows. U1 - u1 ⇒ 1000 - 500 = 500

[0049] Based on the results described above, U1-u1>u2 becomes 500<700, and the first switching condition is not met. The real-time analysis unit 222 checks the first switching condition (for example, U i -u i >u k If it is determined that the condition is not met (step S206-NO), then it is determined whether k is the maximum value (step S209).

[0050] If the real-time analysis unit 222 determines that k is not the maximum value (step S209-NO), it adds 1 to the value of k (step S210). Then, the real-time analysis unit 222 executes the process in step S206 again. For example, as in the example above, if i=1, k=2 and k is not the maximum value, the real-time analysis unit 222 adds 1 to the value of k to make k=3. Then, the real-time analysis unit 222 determines whether U1-u1>u3 is satisfied.

[0051] On the other hand, if the real-time analysis unit 222 determines that k is at its maximum value (step S209-YES), it determines whether i is at its maximum value (step S211). If the real-time analysis unit 222 determines that i is at its maximum value (step S211-YES), it terminates the process.

[0052] On the other hand, if the real-time analysis unit 222 determines that i is not the maximum value (step S211-NO), it adds 1 to the value of i (step S212). After that, the real-time analysis unit 222 executes the process in step S205 again. For example, if i=1 and k=3, and k is the maximum value but i is not the maximum value, the real-time analysis unit 222 adds 1 to the value of i to make i=2.

[0053] Then, in the process of step S205, the real-time analysis unit 222 substitutes the value of (i+1) for k (step S205). In this case, i=2 and k=3. After that, in the process of step S206, the real-time analysis unit 222 determines whether or not U2-u2>u3 is satisfied.

[0054] Figure 5 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile network system 100 in the first embodiment. In the explanation of Figure 5, distributed station 14-1 is assumed to be the destination distributed station, and distributed station 14-2 is assumed to be the source distributed station. Here, they will be referred to as destination distributed station 14-1 and source distributed station 14-2.

[0055] The acquisition unit 211 of the management control device 20 acquires coordination information from the switching destination distributed station 14-1 and the switching source distributed station 14-2 at predetermined intervals (steps S301 and S302). The acquisition unit 211 stores the acquired coordination information in the coordination information storage unit 221. When the coordination information is stored in the coordination information storage unit 221, the real-time analysis unit 222 makes a decision on switching the optical path and sleep control (step S303).

[0056] The decision to switch the optical path and perform sleep control in step S303 is to determine whether or not the first switching condition in step S104 has been met. Here, let's assume that the first switching condition in step S104 has been met. If the first switching condition has been met, the real-time analysis unit 222 instructs the optical path switching control unit 231 to perform optical path switching control and instructs the sleep control unit 232 to perform sleep control.

[0057] The optical path switching control unit 231 notifies the switching device 13 and the aggregation station 15 of the optical path switching destination information (step S304). The optical path switching destination information is information regarding the destination of the optical path. In the example shown in Figure 5, the optical path switching destination information includes information indicating the destination distributed station 14-1 as the destination of the optical path. When the switching device 13 receives the optical path switching destination information from the management control device 20, it instructs the radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 to switch the optical path (step S305). For example, the switching device 13 instructs the radio station 12 connected to the source distributed station 14-2 to switch the optical path to the destination distributed station 14-1, instructs the destination distributed station 14-1 to switch so that the optical path is connected to the radio station 12 connected to the source distributed station 14-2, and instructs the source distributed station 14-2 not to set an optical path.

[0058] The radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 prepare for the optical path switching (steps S306, S307, and S308). The radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 transmit an optical path switching response notification to the switching device 13 (steps S309, S310, and S311). The optical path switching response notification is a signal that includes information indicating that the optical path switching destination information has been received.

[0059] When the switching device 13 receives an optical path switching response notification from the source distributed station 14-2, it sends an optical path switching start notification to the radio station 12 connected to the radio station 12 connected to the source distributed station 14-2, and to the destination distributed station 14-1 (step S312). The optical path switching start notification is a signal that includes a command to start switching the optical path.

[0060] The radio station 12 connected to the source distribution station 14-2 and the destination distribution station 14-1 switch their optical paths in response to receiving the optical path switching start notification (steps S313, S314). This process switches the optical path of the radio station 12 connected to the source distribution station 14-2 to point towards the destination distribution station 14-1. In other words, the radio station 12 and the destination distribution station 14-1 become able to communicate with each other.

[0061] The destination distributed station 14-1 transmits a route switching request to the core device 16 (step S315). A route switching request is a signal that includes a request for switching of the communication path in the core device 16. The core device 16 switches the path in response to receiving the route switching request (step S316).

[0062] Once the route switching is complete, the core device 16 sends a route switching response notification to the destination distributed station 14-1 (step S317). The route switching response notification is a signal that indicates that the switching of the communication route in the core device 16 is complete.

[0063] When the optical path switching is complete, the radio station 12 transmits an optical path switching completion notification to the control device 20 (step S318). The optical path switching completion notification is a signal that includes information indicating that the optical path switching has been completed. When the destination distributed station 14-1 has completed the optical path switching, it transmits an optical path switching completion notification to the control device 20 (step S319).

[0064] When the sleep control unit 232 receives an optical path switching completion notification from the destination of the optical path switching start notification, it sends a sleep permission notification to the switching source distributed station 14-2 (step S320). When the switching source distributed station 14-2 receives the sleep permission notification from the management control device 20, it sends a sleep response notification to the management control device 20 (step S321). The sleep response notification is a signal that includes information indicating that the sleep permission notification has been received. After sending the sleep response notification, the switching source distributed station 14-2 enters a sleep state (step S322).

[0065] Figure 6 is a flowchart showing an example of the sleep wake-up process performed by the management control device 20 in the first embodiment. The acquisition unit 211 acquires information on the number of connected terminals and the sleeping distributed stations 14-k from each distributed station 14 as linked information (step S401). The acquisition unit 211 notifies the analysis unit 22 of the acquired information on the number of connected terminals and the sleeping distributed stations 14-k.

[0066] The real-time analysis unit 222 reads information from the cooperation information storage unit 221 regarding the maximum number of terminals each distributed station 14 can accommodate and information regarding the radio station 12 that was connected to the sleeping distributed station 14-k (step S402). Based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221, the real-time analysis unit 222 calculates the number of additional terminals that each distributed station 14 can accommodate (step S403).

[0067] Next, the real-time analysis unit 222 substitutes the value 1 for the constant i (step S404). The real-time analysis unit 222 then performs the analysis. i i Determine whether the condition is met (step S405). i i The conditions shown are specific examples of the first sleep wake-up conditions. The real-time analysis unit 222 determines the first sleep wake-up conditions (for example, U i i If it is determined that the condition is met (step S405-YES), it is determined that the sleeping distributed station 14-k needs to be woken up and the optical path needs to be switched. ​​​

[0068] The real-time analysis unit 222 notifies the control unit 23 of the determination result. Based on the determination result, the sleep control unit 232 sends an instruction to the distributed station 14-k that is in sleep mode to wake it up (step S406). The optical path switching control unit 231 obtains information about the radio station 12 that was connected to the distributed station 14-k before sleep mode from the information obtained in step S402. The optical path switching control unit 231 instructs the radio station 12 that was connected to the distributed station 14-k before sleep mode to change its connection to the distributed station 14-k.

[0069] In the process of step S405, the real-time analysis unit 222 determines the first sleep release condition (for example, U i i If it is determined that the condition is not met (step S405-NO), it is determined whether i is the maximum value (step S408). If the real-time analysis unit 222 determines that i is the maximum value (step S408-YES), it terminates the process.

[0070] On the other hand, if the real-time analysis unit 222 determines that i is not the maximum value (step S408-NO), it adds the value of 1 to the value of i (step S409). After that, the real-time analysis unit 222 executes the process in step S405 again.

[0071] Here, we will explain the process in Figure 6 using specific numerical values. As an example, the total number of distributed stations 14 is 2 (I=2), the maximum number of terminals that distributed station 14-1 can accommodate is 1000, the number of terminals that distributed station 14-1 can accommodate is 800, the maximum number of terminals that distributed station 14-2 can accommodate is 800, and the number of terminals that distributed station 14-2 can accommodate is 1000.

[0072] If i=1, U1<u1は、1000> The value becomes 800, and the first sleep wake-up condition is not met. The real-time analysis unit 222 determines that the first sleep wake-up condition (for example, U i i ​​) If it is determined that the condition is not satisfied (step S405 - NO), it is determined whether i is the maximum value (step S408). Currently, since i = 1, the real - time analysis unit 222 determines that i is not the maximum value.

[0073] The real - time analysis unit 222 adds a value of 1 to the value of i to set i = 2. The real - time analysis unit 222 executes the process of step S405 again. When i = 2, U2 < u2 becomes 800 < 1000, and the first sleep release condition is satisfied. Then, the processes of steps S406 and S407 are executed.

[0074] FIG. 7 is a sequence diagram showing an example of the detailed flow of the sleep release process executed by the mobile NW system 100 in the first embodiment. In the description of FIG. 7, it is assumed that the distributed station 14 - 2 is in the sleep state.

[0075] The distributed station 14 - 2 is in the sleep state (step S501). The acquisition unit 211 of the management control device 20 acquires the cooperation information from the distributed station 14 - 1 at a predetermined cycle (step S502). The acquisition unit 211 stores the acquired cooperation information in the cooperation information storage unit 221. When the cooperation information is stored in the cooperation information storage unit 221, the real - time analysis unit 222 performs optical path switching and sleep control determination (step S503). The optical path switching and sleep control determination in step S503 is whether the sleep release condition is satisfied. Here, it is assumed that the sleep release condition is satisfied.

[0076] The sleep control unit 232 of the management control device 20 transmits a sleep release notice to the distributed station 14 - 2 (step S504). The sleep release notice is a signal including content indicating the release of the sleep state. In response to the reception of the sleep release notice, the distributed station 14 - 2 transmits a sleep release response notice to the management control device 20 (step S505). The sleep release response notice is a signal including content indicating the reception of the sleep release notice.

[0077] The optical path switching control unit 231 notifies the switching device 13 and the aggregation station 15 of the optical path switching destination information (step S506). When the switching device 13 receives the optical path switching destination information from the management control device 20, it instructs the radio station 12, the distributed station 14-1, and the distributed station 14-2 to switch the optical path (step S507).

[0078] Radio station 12, distributed station 14-1, and distributed station 14-2 prepare for optical path switching (steps S508, S509, and S510). Once preparation for optical path switching is complete, radio station 12, distributed station 14-1, and distributed station 14-2 send an optical path switching response notification to the switching device 13 indicating that preparation for switching is complete (steps S511, S512, and S513).

[0079] When the switching device 13 receives optical path switching response notifications from the radio station 12, the distributed station 14-1, and the distributed station 14-2, it sends an optical path switching start notification to the radio station 12, the distributed station 14-1, and the distributed station 14-2 (step S514).

[0080] Radio station 12, distributed station 14-1, and distributed station 14-2 switch optical paths in response to receiving an optical path switching start notification (steps S515, S516, and S517). Distributed station 14-1 sends a route switching request to core device 16 (step S518). Core device 16 switches routes in response to receiving the route switching request (step S519). Once the route switching is complete, core device 16 sends a route switching response notification to distributed station 14-1 (step S520).

[0081] When the optical path switching is complete, the radio station 12 sends an optical path switching completion notification to the control unit 20 (step S521). When the optical path switching is complete, the distributed station 14-1 sends an optical path switching completion notification to the control unit 20 (step S522). When the optical path switching is complete, the distributed station 14-2 sends an optical path switching completion notification to the control unit 20 (step S523).

[0082] The mobile network system 100 configured as described above includes one or more radio stations 12 that communicate wirelessly with one or more terminals 11, multiple distributed stations 14 connected to the one or more radio stations 12 via a switching device 13, a cooperation information collection unit 21 that acquires cooperation information indicating the communication status between the multiple distributed stations 14 and one or more terminals 11 at predetermined intervals, an optical path switching control unit 231 that controls the switching of optical paths between the one or more radio stations 12 and the multiple distributed stations 14 when it is determined that switching of optical paths between the one or more radio stations 12 and the multiple distributed stations 14 is necessary based on the cooperation information, and a sleep control unit 232 that puts distributed stations capable of going into sleep mode after the optical path switching has been performed. This allows for optical path switching and sleep control while analyzing the load of each distributed station 14. Therefore, it is possible to significantly reduce power consumption without degrading communication quality.

[0083] (Modification 1 in the first embodiment) In the embodiment described above, the management control device 20 is configured to directly acquire cooperation information from the distributed stations 14. The management control device 20 may acquire cooperation information via other devices. Here, other devices are, for example, wireless controllers. Figure 8 is a diagram showing an example configuration of a mobile network system 100a in Modification 1 of the first embodiment. The mobile network system 100a comprises one or more wireless stations 12, a switching device 13, a plurality of distributed stations 14, an aggregation station 15, a core device 16, a management control device 20, and a wireless controller 30a. As shown in Figure 8, in the mobile network system 100a, a wireless controller 30a is provided between the management control device 20 and the distributed stations 14.

[0084] The wireless controller 30a acquires cooperation information from each distributed station 14 at predetermined intervals via wireless communication. The wireless controller 30a transmits the acquired cooperation information to the management control device 20 via wireless communication. Alternatively, the wireless controller 30a may receive a sleep control instruction from the management control device 20 and transmit it to the switching source distributed station. This configuration allows for the collection of collaborative information via wireless communication.

[0085] (Modification 2 in the first embodiment) In the embodiment described above, the management control device 20 is configured to perform optical path switching control processing and sleep control processing. Alternatively, the switching device 13 may be configured to perform optical path switching control processing and sleep control processing. Figure 9 is a diagram showing an example configuration of a mobile NW system 100b in a modified example 2 of the first embodiment. The mobile NW system 100b comprises one or more radio stations 12, a switching device 13b, a plurality of distributed stations 14, an aggregation station 15, a core device 16, and a management control device 20b.

[0086] As shown in Figure 9, the switching device 13b includes a control unit 23, while the management control device 20b does not include a control unit 23. The real-time analysis unit 222 of the management control device 20b notifies the switching device 13b of the analysis results. The real-time analysis unit 222 may also notify the switching device 13b of the analysis results only when optical path switching and sleep control are performed. The control unit 23 of the switching device 13b performs optical path switching control processing and sleep control processing based on the analysis results notified from the management control device 20b.

[0087] Figure 10 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100b in a modified example 2 of the first embodiment. In Figure 10, processes similar to those in Figure 5 are denoted by the same reference numerals as in Figure 5 and their explanation is omitted. In the explanation of Figure 10, distributed station 14-1 is assumed to be the destination distributed station, and distributed station 14-2 is assumed to be the source distributed station. Here, they will be referred to as destination distributed station 14-1 and source distributed station 14-2.

[0088] After the processes from step S301 to step S303 are executed, the real-time analysis unit 222 instructs the switching device 13b to perform optical path switching control and sleep control if the first switching condition is met (step S601). The switching device 13b receives the instruction transmitted from the management control device 20b.

[0089] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S602). The optical path switching control unit 231 notifies the aggregation station 15 of the optical path switching destination information (step S603). Subsequently, the optical path switching control unit 231 instructs the radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 to switch the optical path (step S604). After that, the processes from steps S306 to S317 are executed.

[0090] When the optical path switching is complete, the radio station 12 sends an optical path switching completion notification to the switching device 13b (step S605). The radio station 12 may also send the optical path switching completion notification to the management control device 20b. When the switching destination distributed station 14-1 is complete, it sends an optical path switching completion notification to the switching device 13b (step S606). The radio station 12 may also send the optical path switching completion notification to the management control device 20b.

[0091] When the sleep control unit 232 of the switching device 13b receives an optical path switching completion notification from the destination of the optical path switching start notification, it sends a sleep permission notification to the switching source distributed station 14-2 (step S607). When the switching source distributed station 14-2 receives the sleep permission notification from the switching device 13b, it sends a sleep response notification to the switching device 13b (step S608). After sending the sleep response notification, the switching source distributed station 14-2 enters a sleep state (step S322).

[0092] Figure 11 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100b in a modified example 2 of the first embodiment. In Figure 11, processes similar to those in Figure 7 are denoted by the same reference numerals as in Figure 7 and their explanation is omitted. In the explanation of Figure 11, it is assumed that the distributed station 14-2 is in a sleep state.

[0093] After the processes from step S501 to step S503 are executed, the real-time analysis unit 222 instructs the switching device 13b to perform optical path switching control and sleep control if the sleep release conditions are met (step S701). The switching device 13b receives the instruction transmitted from the management control device 20b.

[0094] The sleep control unit 232 of the switching device 13b transmits a sleep wake notification to the distributed station 14-2 based on the information contained in the received instruction (step S702). In response to receiving the sleep wake notification, the distributed station 14-2 transmits a sleep wake response notification to the switching device 13b (step S703).

[0095] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S704). The optical path switching control unit 231 of the switching device 13b notifies the aggregation station 15 of the optical path switching destination information (step S705). Subsequently, the processes from steps S507 to S520 are executed.

[0096] When the optical path switching is complete, radio station 12 sends an optical path switching completion notification to switching device 13b (step S706). When the optical path switching is complete, distributed station 14-1 sends an optical path switching completion notification to switching device 13b (step S707). When the optical path switching is complete, distributed station 14-2 sends an optical path switching completion notification to switching device 13b (step S708).

[0097] (Second embodiment) The second embodiment differs from the first embodiment in that it further includes processing load information (for example, information on memory usage or CPU usage for each distributed station) as collaborative information. In the second embodiment, as an example of processing load information, information on memory usage for each distributed station will be explained.

[0098] Figure 12 shows an example configuration of the mobile network system 100c in the second embodiment. The mobile network system 100c in the second embodiment comprises one or more radio stations 12, a switching device 13, a plurality of distributed stations 14, an aggregation station 15, a core device 16, and a management control device 20c. The management control device 20c comprises a collaborative information collection unit 21c, an analysis unit 22c, and a control unit 23.

[0099] The collaborative information collection unit 21c comprises an acquisition unit 211 and a distributed station monitoring unit 212c. The distributed station monitoring unit 212c monitors each distributed station 14 and measures the memory usage rate for each distributed station 14. The distributed station monitoring unit 212c outputs the memory usage rate information measured for each distributed station 14 as collaborative information to the analysis unit 22c.

[0100] The analysis unit 22c comprises a collaboration information storage unit 221 and a real-time analysis unit 222c. Based on the collaboration information, the real-time analysis unit 222c analyzes the communication status in the mobile NW system 100c, such as the change in the number of connections of the distributed station 14 per unit time. Specifically, the real-time analysis unit 222c divides the memory usage rate by the current number of connected terminals to estimate the memory usage rate per unit. Furthermore, the real-time analysis unit 222c multiplies the number of connected terminals of other distributed stations 14 by the memory usage rate per unit of the target distributed station 14, and determines optical path switching and sleep mode if the memory usage rate does not exceed 100% and the number of connected terminals of that distributed station 14 is less than the number of additional terminals that the target distributed station 14 can accommodate.

[0101] Figure 13 is a flowchart showing an example of the sleep process flow executed by the management control device 20c in the second embodiment. In Figure 13, processes similar to those in Figure 3 are denoted by the same reference numerals as in Figure 3, and their explanation is omitted.

[0102] The collaboration information collection unit 21c acquires collaboration information from each distributed station 14 (step S801). Specifically, the acquisition unit 211 acquires information such as the number of connected terminals and the maximum number of connected terminals from each distributed station 14 as collaboration information. Furthermore, the distributed station monitoring unit 212c measures the memory usage rate for each distributed station 14. The collaboration information collection unit 21c stores the acquired collaboration information for each distributed station 14 in the collaboration information storage unit 221 (step S802). Specifically, the collaboration information collection unit 21c stores information such as the number of connected terminals and the maximum number of connected terminals from each distributed station 14, as well as information on the memory usage rate for each distributed station 14, in the collaboration information storage unit 221 as collaboration information.

[0103] The real-time analysis unit 222c calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S803). Furthermore, the real-time analysis unit 222c estimates the memory usage rate of each distributed station 14 based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S804).

[0104] The real-time analysis unit 222c determines whether the second switching condition has been met (step S805). The second switching condition is a condition indicating that a switch in the optical path between the radio station 12 and the distributed station 14 is necessary, for example, that the number of additional terminals that a certain distributed station 14 can accommodate is greater than the number of terminals that the distributed station 14 subject to sleep determination can accommodate, and that the memory usage rate does not exceed 100%.

[0105] If the real-time analysis unit 222c determines that the second switching condition is met (step S805-YES), it executes the processes from step S105 onwards. On the other hand, if the real-time analysis unit 222c determines that the second switching condition is not met (step S805-NO), it executes the processes from step S107 onwards.

[0106] Figure 14 is a flowchart showing an example of the sleep process flow executed by the management control device 20c in the second embodiment. The process shown in Figure 14 is described in more detail than the process shown in Figure 13. In Figure 14, processes similar to those in Figure 4 are denoted by the same reference numerals as in Figure 4 and their explanation is omitted.

[0107] The acquisition unit 211 acquires information from each distributed station 14 as linked information, including the maximum number of terminals each distributed station can accommodate, connected radio station information, and the number of terminals each distributed station can accommodate. Furthermore, the distributed station monitoring unit 212c acquires information on the memory usage rate of each distributed station 14 (step S901).

[0108] The acquisition unit 211 stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221. The distributed station monitoring unit 212c stores the acquired memory usage information for each distributed station 14 as cooperation information (step S902). The real-time analysis unit 222c calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S903). Furthermore, the real-time analysis unit 222c estimates the memory usage rate per unit of each distributed station 14 based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S904).

[0109] Next, the real-time analysis unit 222c substitutes the value 1 for the constant i (step S905). Next, the real-time analysis unit 222c substitutes the value (i+1) for k (step S906). After that, the real-time analysis unit 222c calculates 100-M i >m i ×u k , and U i -u i >u k Determine whether the condition is met (step S907). i This represents the memory usage of distributed station 14-i, and m i This represents the memory usage rate per unit for each of the 14 distributed stations. i This is calculated in the process of step S904. 100-M i >m i ×u k, and U i -u i >u k The conditions shown are specific examples of the second switching condition.

[0110] If the real-time analysis unit 222c determines that the second switching condition is met (step S907-YES), it executes the processing from step S207 onwards. On the other hand, if the real-time analysis unit 222c determines that the second switching condition is not met (step S907-NO), it executes the processing from step S209 onwards.

[0111] Here, we will explain the process in Figure 14 using specific numerical values. As an example, suppose that the maximum number of terminals accommodated by distributed station 14-1 is 1000, the number of terminals accommodated by distributed station 14-1 is 100, the memory usage rate M1 of distributed station 14-1 is 20%, the maximum number of terminals accommodated by distributed station 14-2 is 800, the number of terminals accommodated by distributed station 14-2 is 200, and the memory usage rate M2 of distributed station 14-2 is 30%. In this case, in the process of step S904, the real-time analysis unit 222c calculates m1=20 / 100=0.2 and m2=30 / 200=0.15 as approximate values ​​for the memory usage rate per unit of distributed station 14. m1 represents the approximate value for the memory usage rate per unit of distributed station 14-1, and m2 represents the approximate value for the memory usage rate per unit of distributed station 14-2.

[0112] The real-time analysis unit 222c processes 100-M in step S907. i >m i ×u k , and U i -u i >u k We determine whether the condition is met. If i=1 and k=2, it can be expressed as follows. ·100-M i ⇒100-20=80 ·m i ×u k ⇒ 0.2 × 200 = 40 ·U i -u i ⇒1000-100=900

[0113] Based on the results described above, 100-M i >m i ×u k , and U i -u i >u k The conditions are 180 > 40 and 900 > 200. In this case, the real-time analysis unit 222c determines that the second switching condition has been met. Therefore, the real-time analysis unit 222c decides to switch the radio station 12 connected to distributed station 14-2 to distributed station 14-1, and decides to put distributed station 14-2 into sleep mode. The real-time analysis unit 222c notifies the optical path switching control unit 231 of the result of its decision to switch the radio station 12 connected to distributed station 14-2 to distributed station 14-1, and notifies the sleep control unit 232 of its decision to put distributed station 14-2 into sleep mode.

[0114] As a result, the optical path switching control unit 231 controls the switching of the optical path to connect the radio station 12 connected to the distributed station 14-2 to the distributed station 14-1, in accordance with the notification from the real-time analysis unit 222c. The sleep control unit 232 controls the sleep state to put the distributed station 14-2 into a sleep state, in accordance with the notification from the real-time analysis unit 222c.

[0115] Figure 15 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100c in the second embodiment. In Figure 15, processes similar to those in Figure 5 are denoted by the same reference numerals as in Figure 5, and their explanation is omitted. In the explanation of Figure 15, distributed station 14-1 is assumed to be the destination distributed station, and distributed station 14-2 is assumed to be the source distributed station. Here, they will be referred to as destination distributed station 14-1 and source distributed station 14-2.

[0116] The cooperation information collection unit 21c of the management control device 20c acquires cooperation information from the switching destination distributed station 14-1 and the switching source distributed station 14-2 at predetermined intervals (steps S1001 and S1002). The cooperation information acquired in steps S1001 and S1002 includes at least information on the number of connected terminals, information on the maximum number of connected terminals, and information on the memory usage rate for each distributed station 14. The cooperation information collection unit 21c stores the acquired cooperation information in the cooperation information storage unit 221.

[0117] When the real-time analysis unit 222c stores the linkage information storage unit 221, it performs optical path switching and sleep control determination (step S1003). The optical path switching and sleep control determination in step S1003 is a determination of whether or not the second switching condition in step S805 has been met. Here, let's assume that the second switching condition in step S805 has been met. If the second switching condition has been met, the real-time analysis unit 222c executes the processing from step S304 onwards.

[0118] Figure 16 is a flowchart showing an example of the sleep wake-up process performed by the management control device 20c in the second embodiment. In Figure 16, processes similar to those in Figure 6 are denoted by the same reference numerals as in Figure 6, and their explanation is omitted.

[0119] The acquisition unit 211 acquires information on the number of connected terminals and the number of sleeping distributed stations 14-k from each distributed station 14 as linked information. Furthermore, the distributed station monitoring unit 212c acquires information on the memory usage rate for each distributed station 14 as linked information (step S1101). The acquisition unit 211 notifies the analysis unit 22c of the acquired information on the number of connected terminals, the number of sleeping distributed stations 14-k, and the memory usage rate.

[0120] The real-time analysis unit 222c of the analysis unit 22c reads information from the cooperation information storage unit 221 about the maximum number of terminals that each distributed station 14 can accommodate and information about the radio station 12 that was connected to the sleeping distributed station 14-k (step S1102). Based on the cooperation information for each distributed station 14 obtained, the real-time analysis unit 222c calculates the number of additional terminals that each distributed station 14 can accommodate (step S1103).

[0121] Next, the real-time analysis unit 222c substitutes the value 1 for the constant i (step S1104). The real-time analysis unit 222c then performs the analysis. i i , or T1 <M i Determine whether any of the following conditions are met (step S1105). i i , or T1 <M i The conditions shown are specific examples of the second sleep wake-up condition. In the second sleep wake-up condition, T1 <M i The memory usage of distributed station 14-i is M i This means that the value has exceeded the threshold T1 (for example, a predetermined value such as 80%, 90%, or 100%).

[0122] The real-time analysis unit 222c determines the second sleep wake-up condition (for example, U i i , or T1 <M i If it is determined that the condition is met (step S1105-YES), it is determined that switching of the optical path and waking up the sleeping distributed station 14-k are necessary.

[0123] The real-time analysis unit 222c notifies the control unit 23 of the determination result. Subsequently, the processing from step S406 onwards is executed. Meanwhile, the real-time analysis unit 222c determines the second sleep release condition (for example, U i i , or T1 <M i If it is determined that the condition is not met (step S1105-NO), the process in step S408 is executed.

[0124] ​​​​Figure 17 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100c in the second embodiment. In Figure 17, processes similar to those in Figure 7 are denoted by the same reference numerals as in Figure 7, and their explanation is omitted. In the explanation of Figure 17, it is assumed that the distributed station 14-2 is in a sleep state.

[0125] Distributed station 14-2 is in a sleep state (step S501). The cooperation information collection unit 21c of the management control device 20c acquires cooperation information from distributed station 14-1 at predetermined intervals (step S1201). The cooperation information acquired in step S1201 includes at least information on the number of connected terminals, information on the maximum number of connected terminals, etc., as well as information on the memory usage rate for each distributed station 14. The cooperation information collection unit 21c stores the acquired cooperation information in the cooperation information storage unit 221.

[0126] When the real-time analysis unit 222c stores the linkage information storage unit 221, it performs optical path switching and sleep control determination (step S1202). The optical path switching and sleep control determination in step S1202 is whether or not the sleep release condition has been met. Here, let's assume that the sleep release condition has been met. If the sleep release condition has been met, the real-time analysis unit 222c executes the processing from step S504 onwards.

[0127] The mobile network system 100c in the second embodiment configured as described above can achieve the same effects as the first embodiment. Specifically, in the mobile network system 100c, the management control device 20c further acquires information on the memory usage rate of each distributed station 14 as cooperation information, and determines whether or not to switch optical paths based on the cooperation information. If the management control device 20c determines that switching optical paths is necessary, it controls the switching of optical paths between one or more radio stations 12 and multiple distributed stations 14. Furthermore, after the optical path switching has been performed, the management control device 20c puts distributed stations that can enter sleep mode into sleep mode. This allows for the control of optical path switching and sleep mode while analyzing the load of each distributed station 14. Therefore, it becomes possible to significantly reduce power consumption without degrading communication quality.

[0128] (Modification 1 in the second embodiment) In the embodiment described above, the management control device 20c is configured to directly acquire cooperation information from the distributed station 14. The management control device 20c may also acquire cooperation information via other devices. Here, other devices are, for example, wireless controllers. In this configuration, the mobile NW system 100c is newly equipped with a wireless controller 30a, and the wireless controller 30a is provided between the management control device 20c and the distributed station 14.

[0129] The wireless controller 30a acquires cooperation information from each distributed station 14 at predetermined intervals via wireless communication. The wireless controller 30a transmits the acquired cooperation information to the management control device 20c via wireless communication. Alternatively, the wireless controller 30a may receive a sleep control instruction from the management control device 20c and transmit it to the switching source distributed station. This configuration allows for the collection of collaborative information via wireless communication.

[0130] (Modification 2 in the second embodiment) In the embodiment described above, the management control device 20c is configured to perform optical path switching control processing and sleep control processing. In contrast, the switching device 13 may be configured to perform optical path switching control processing and sleep control processing. In this configuration, the switching device 13 includes a control unit 23, while the management control device 20c does not include a control unit 23. The real-time analysis unit 222c of the management control device 20c notifies the switching device 13 of the analysis results. The real-time analysis unit 222c may notify the switching device 13 of the analysis results only when optical path switching and sleep control are performed. The control unit 23 of the switching device 13 performs optical path switching control processing and sleep control processing based on the analysis results notified by the management control device 20c.

[0131] Figure 18 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100c in a modified example 2 of the second embodiment. In Figure 18, processes similar to those in Figure 15 are denoted by the same reference numerals as in Figure 15 and their descriptions are omitted.

[0132] After the processes from step S1001 to step S1003 are executed, the real-time analysis unit 222c instructs the switching device 13b to perform optical path switching control and sleep control if the second switching condition is met (step S1301). The switching device 13b receives the instruction transmitted from the management control device 20c.

[0133] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S1302). The optical path switching control unit 231 notifies the aggregation station 15 of the optical path switching destination information (step S1303). Subsequently, the optical path switching control unit 231 instructs the radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 to switch the optical path (step S1304). After that, the processes from steps S306 to S317 are executed.

[0134] When the optical path switching is complete, radio station 12 sends an optical path switching completion notification to switching device 13b (step S1305). Radio station 12 may also send the optical path switching completion notification to management control device 20c. When the switching destination distributed station 14-1 is complete, it sends an optical path switching completion notification to switching device 13 (step S1306). Radio station 12 may also send the optical path switching completion notification to management control device 20c.

[0135] When the sleep control unit 232 of the switching device 13b receives an optical path switching completion notification from the destination of the optical path switching start notification, it sends a sleep permission notification to the switching source distributed station 14-2 (step S1307). When the switching source distributed station 14-2 receives the sleep permission notification from the switching device 13, it sends a sleep response notification to the switching device 13b (step S1308). After sending the sleep response notification, the switching source distributed station 14-2 enters a sleep state (step S322).

[0136] Figure 19 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100c in a modified example 2 of the second embodiment. In Figure 19, processes similar to those in Figure 17 are denoted by the same reference numerals as in Figure 17 and their explanation is omitted. Note that in the explanation of Figure 17, it is assumed that the distributed station 14-2 is in a sleep state.

[0137] After steps S501, S1201, and S1202 are executed, the real-time analysis unit 222c instructs the switching device 13b to perform optical path switching control and sleep control if the sleep release conditions are met (step S1401). The switching device 13b receives the instruction transmitted from the management control device 20c.

[0138] The sleep control unit 232 of the switching device 13b transmits a sleep wake notification to the distributed station 14-2 based on the information contained in the received instruction (step S1402). In response to receiving the sleep wake notification, the distributed station 14-2 transmits a sleep wake response notification to the switching device 13b (step S1403).

[0139] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S1404). The optical path switching control unit 231 of the switching device 13b notifies the aggregation station 15 of the optical path switching destination information (step S1405). Subsequently, the processes from steps S507 to S520 are executed.

[0140] When the optical path switching is complete, the radio station 12 sends an optical path switching completion notification to the switching device 13b (step S1406). When the optical path switching is complete, the distributed station 14-1 sends an optical path switching completion notification to the switching device 13b (step S1407). When the optical path switching is complete, the distributed station 14-2 sends an optical path switching completion notification to the switching device 13b (step S1408).

[0141] (Third embodiment) In the third embodiment, the configuration differs from the second embodiment in that the linked information further includes processing load information (for example, information on memory usage or CPU usage for each distributed station) and processing delay information for each distributed station. The system configuration is the same as in the second embodiment. In the third embodiment, as an example of processing load information, information on memory usage for each distributed station will be explained as an example.

[0142] The management control device 20c determines optical path switching and sleep based on information on the number of terminals for each distributed station 14, information on the memory usage rate for each distributed station 14, and information on the processing delay for each distributed station 14. For example, the distributed station monitoring unit 212c monitors each distributed station 14 and measures the memory usage rate for each distributed station 14. Furthermore, the distributed station monitoring unit 212c monitors each distributed station 14 and collects processing delay information for each distributed station 14. The distributed station monitoring unit 212c outputs the memory usage information measured for each distributed station 14 and the processing delay information for each distributed station 14 as linked information to the analysis unit 22c.

[0143] Figure 20 is a flowchart showing an example of the sleep process flow executed by the management control device 20c in the third embodiment. In Figure 20, processes similar to those in Figure 13 are denoted by the same reference numerals as in Figure 13 and their explanation is omitted.

[0144] The collaboration information collection unit 21c acquires collaboration information from each distributed station 14 (step S1501). Specifically, the acquisition unit 211 acquires information such as the number of connected terminals and the maximum number of connected terminals from each distributed station 14 as collaboration information. Furthermore, the distributed station monitoring unit 212c measures the memory usage rate for each distributed station 14 and acquires processing delay information for each distributed station 14. The collaboration information collection unit 21c stores the acquired collaboration information for each distributed station 14 in the collaboration information storage unit 221 (step S1502). Specifically, in addition to the collaboration information including information such as the number of connected terminals and the maximum number of connected terminals from each distributed station 14, the collaboration information collection unit 21c stores information on the memory usage rate for each distributed station 14 and processing delay information for each distributed station 14 as collaboration information in the collaboration information storage unit 221.

[0145] The real-time analysis unit 222c calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S1503). Furthermore, the real-time analysis unit 222c estimates the memory usage rate of each distributed station 14 based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S1504).

[0146] The real-time analysis unit 222c determines whether the third switching condition has been met (step S1505). The third switching condition is a condition that indicates that a switch in the optical path between the radio station 12 and the distributed station 14 is necessary, for example, that the number of additional terminals that a certain distributed station 14 can accommodate is greater than the number of terminals that the distributed station 14 subject to sleep determination can accommodate, that the memory usage rate does not exceed 100%, and that the processing delay of the distributed station 14 subject to sleep determination does not exceed a threshold.

[0147] If the real-time analysis unit 222c determines that the third switching condition is met (step S1505-YES), it executes the processes from step S105 onwards. On the other hand, if the real-time analysis unit 222c determines that the third switching condition is not met (step S1505-NO), it executes the processes from step S107 onwards.

[0148] Figure 21 is a flowchart showing an example of the sleep process flow executed by the management control device 20c in the third embodiment. The process shown in Figure 21 is described in more detail as the process shown in Figure 20. In Figure 21, processes similar to those in Figure 14 are denoted by the same reference numerals as in Figure 14 and their explanation is omitted.

[0149] The acquisition unit 211 acquires information from each distributed station 14 as linked information, including the maximum number of terminals each distributed station can accommodate, connected radio station information, and the number of terminals each distributed station can accommodate. Furthermore, the distributed station monitoring unit 212c acquires information on the memory usage rate and processing delay information of each distributed station 14 (step S1601).

[0150] The acquisition unit 211 stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221. Furthermore, the distributed station monitoring unit 212c stores the acquired memory usage information and processing delay information for each distributed station 14 as cooperation information (step S1602). The real-time analysis unit 222c calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S1603). Furthermore, the real-time analysis unit 222c estimates the memory usage rate per unit of each distributed station 14 based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S1604).

[0151] Next, the real-time analysis unit 222c substitutes the value 1 for the constant i (step S1605). Next, the real-time analysis unit 222c substitutes the value (i+1) for k (step S1606). After that, the real-time analysis unit 222c calculates 100-M i >m i ×u k , and Ui -u i >u k , and, T>t i Determine whether the condition is met (step S1607). T represents a threshold, and in the third embodiment, t i This represents the processing delay of distributed station 14-i. 100-M i >m i ×u k , and U i -u i >u k , and, T>t i The conditions shown are specific examples of the third switching condition.

[0152] If the real-time analysis unit 222c determines that the third switching condition is met (step S1607-YES), it executes the processing from step S207 onwards. On the other hand, if the real-time analysis unit 222c determines that the third switching condition is not met (step S1607-NO), it executes the processing from step S209 onwards.

[0153] Figure 22 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100c in the third embodiment. In Figure 22, processes similar to those in Figure 15 are denoted by the same reference numerals as in Figure 15 and their explanation is omitted. In the explanation of Figure 22, distributed station 14-1 is assumed to be the destination distributed station, and distributed station 14-2 is assumed to be the source distributed station. Here, they will be referred to as destination distributed station 14-1 and source distributed station 14-2.

[0154] The cooperation information collection unit 21c of the management control device 20c acquires cooperation information from the switching destination distributed station 14-1 and the switching source distributed station 14-2 at predetermined intervals (steps S1701 and S1702). The cooperation information acquired in steps S1701 and S1702 includes at least information on the number of connected terminals, information on the maximum number of connected terminals, etc., as well as information on the memory usage rate for each distributed station 14 and processing delay information for each distributed station 14. The cooperation information collection unit 21c stores the acquired cooperation information in the cooperation information storage unit 221.

[0155] When the real-time analysis unit 222c detects that the cooperation information has been stored in the cooperation information storage unit 221, it performs optical path switching and sleep control determination (step S1703). The optical path switching and sleep control determination in step S1703 is a determination of whether the third switching condition in step S1505 is satisfied. Here, it is assumed that the third switching condition in step S1505 is satisfied. When the fifth switching condition is satisfied, the real-time analysis unit 222c executes the processes after step S304.

[0156] FIG. 23 is a flowchart showing an example of the flow of the sleep release process executed by the management control device 20c in the third embodiment. In FIG. 23, for the processes similar to those in FIG. 16, the same reference numerals as in FIG. 16 are used and the description thereof is omitted.

[0157] The acquisition unit 211 acquires, from each distributed station 14, the information on the number of accommodated terminals and the information on the sleeping distributed station 14-k as cooperation information. Further, the distributed station monitoring unit 212c acquires, as cooperation information, the information on the memory usage rate for each distributed station 14 and the processing delay information for each distributed station 14 (step S1751). The acquisition unit 211 notifies the analysis unit 22c of the acquired information on the number of accommodated terminals, the information on the sleeping distributed station 14-k, the information on the memory usage rate, and the processing delay information for each distributed station 14.

[0158] The real-time analysis unit 222c of the analysis unit 22c reads, from the cooperation information storage unit 221, the information on the maximum number of accommodated terminals of each distributed station 14 and the information on the radio stations 12 connected to the sleeping distributed station 14-k (step S1752). The real-time analysis unit 222c calculates the additional number of terminals that can be accommodated for each distributed station 14 based on the acquired cooperation information for each distributed station 14 (step S1753).

[0159] Next, the real-time analysis unit 222c substitutes a value of 1 into the constant i (step S1754). The real-time analysis unit 222c determines whether any of U i <u i or, T1 < M i or, T < t i is satisfied (step S1755). Ui <u i 、 or, T1 < M i 、 or, T < t i The condition indicated by is a specific example of the third sleep release condition. In the third sleep release condition, T < t i means that the processing delay of the distributed station 14-i has exceeded the threshold value.

[0160] The real-time analysis unit 222c is the third sleep release condition (for example, U i <u i 、 or, T1 < M i 、 or, T < t i ). When it is determined that the condition is satisfied (step S1755 - YES), it is determined that it is necessary to switch the optical path and release the sleep of the sleeping distributed station 14-k.

[0161] The real-time analysis unit 222c notifies the determination result to the control unit 23. After that, the processing after step S406 is executed. On the other hand, when the real-time analysis unit 222c determines that the third sleep release condition (for example, U i <u i 、 or, T1 < M i 、 or, T < t i ) is not satisfied (step S1755 - NO), the processing of step S408 is executed.

[0162] FIG. 24 is a sequence diagram showing an example of the detailed flow of the sleep release process executed by the mobile NW system 100c in the third embodiment. In FIG. 24, the same processes as those in FIG. 17 are denoted by the same reference numerals as in FIG. 17, and the description thereof is omitted. In the description of FIG. 17, it is assumed that the distributed station 14-2 is in the sleep state.

[0163] Distributed station 14-2 is in a sleep state (step S501). The cooperation information collection unit 21c of the management control device 20c acquires cooperation information from distributed station 14-1 at predetermined intervals (step S1801). The cooperation information acquired in step S1801 includes information on the memory usage rate and processing delay information for each distributed station 14. The cooperation information collection unit 21c stores the acquired cooperation information in the cooperation information storage unit 221.

[0164] When the real-time analysis unit 222c stores the linkage information storage unit 221, it performs optical path switching and sleep control determination (step S1802). The optical path switching and sleep control determination in step S1802 is whether or not the sleep release condition has been met. Here, let's assume that the sleep release condition has been met. If the sleep release condition has been met, the real-time analysis unit 222c executes the processing from step S504 onwards.

[0165] The mobile NW system 100c in the third embodiment configured as described above can achieve the same effects as the first embodiment. Specifically, in the mobile NW system 100c in the third embodiment, the management control device 20c further acquires information on the memory usage rate of each distributed station 14 and processing delay information for each distributed station 14 as cooperation information, and determines whether or not to switch optical paths based on the cooperation information. If the management control device 20c determines that switching optical paths is necessary, it controls the switching of optical paths between one or more radio stations 12 and multiple distributed stations 14. Furthermore, after the optical path switching has been performed, the management control device 20c puts distributed stations that can enter sleep mode into sleep mode. This allows for the control of optical path switching and sleep mode while analyzing the load of each distributed station 14. Therefore, it becomes possible to significantly reduce power consumption without degrading communication quality.

[0166] (Modification 1 in the third embodiment) In the embodiment described above, the management control device 20c is configured to directly acquire cooperation information from the distributed station 14. The management control device 20c may also acquire cooperation information via other devices. Here, other devices are, for example, wireless controllers. In this configuration, the mobile NW system 100c is newly equipped with a wireless controller 30a, and the wireless controller 30a is provided between the management control device 20c and the distributed station 14.

[0167] The wireless controller 30a acquires cooperation information from each distributed station 14 at predetermined intervals via wireless communication. The wireless controller 30a transmits the acquired cooperation information to the management control device 20c via wireless communication. Alternatively, the wireless controller 30a may receive a sleep control instruction from the management control device 20c and transmit it to the switching source distributed station. This configuration allows for the collection of collaborative information via wireless communication.

[0168] (Modification 2 in the third embodiment) In the embodiment described above, the management control device 20c is configured to perform optical path switching control processing and sleep control processing. In contrast, the switching device 13 may be configured to perform optical path switching control processing and sleep control processing. In this configuration, the switching device 13 includes a control unit 23, while the management control device 20c does not include a control unit 23. The real-time analysis unit 222c of the management control device 20c notifies the switching device 13 of the analysis results. The real-time analysis unit 222c may notify the switching device 13 of the analysis results only when optical path switching and sleep control are performed. The control unit 23 of the switching device 13 performs optical path switching control processing and sleep control processing based on the analysis results notified by the management control device 20c.

[0169] Figure 25 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100c in a modified example 2 of the third embodiment. In Figure 25, processes similar to those in Figure 22 are denoted by the same reference numerals as in Figure 22 and their explanation is omitted.

[0170] After the processes from step S1701 to step S1703 are executed, the real-time analysis unit 222c instructs the switching device 13b to perform optical path switching control and sleep control if the third switching condition is met (step S1901). The switching device 13b receives the instruction transmitted from the management control device 20c.

[0171] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S1902). The optical path switching control unit 231 notifies the aggregation station 15 of the optical path switching destination information (step S1903). Subsequently, the optical path switching control unit 231 instructs the radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 to switch the optical path (step S1904). After that, the processes from steps S306 to S317 are executed.

[0172] When the optical path switching is complete, radio station 12 sends an optical path switching completion notification to switching device 13b (step S1905). Radio station 12 may also send the optical path switching completion notification to management control device 20c. When the switching destination distributed station 14-1 is complete, it sends an optical path switching completion notification to switching device 13 (step S1906). Radio station 12 may also send the optical path switching completion notification to management control device 20c.

[0173] When the sleep control unit 232 of the switching device 13b receives an optical path switching completion notification from the destination of the optical path switching start notification, it sends a sleep permission notification to the switching source distributed station 14-2 (step S1907). When the switching source distributed station 14-2 receives the sleep permission notification from the switching device 13, it sends a sleep response notification to the switching device 13b (step S1908). After sending the sleep response notification, the switching source distributed station 14-2 enters a sleep state (step S322).

[0174] Figure 26 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100c in a modified example 2 of the third embodiment. In Figure 26, processes similar to those in Figure 23 are denoted by the same reference numerals as in Figure 23 and their explanation is omitted.

[0175] After steps S501, S1801, and S1802 are executed, the real-time analysis unit 222c instructs the switching device 13b to perform optical path switching control and sleep control if the sleep release condition is met (step S2001). The switching device 13b receives the instruction transmitted from the management control device 20c.

[0176] The sleep control unit 232 of the switching device 13b transmits a sleep wake notification to the distributed station 14-2 based on the information contained in the received instruction (step S2002). In response to receiving the sleep wake notification, the distributed station 14-2 transmits a sleep wake response notification to the switching device 13b (step S2003).

[0177] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S2004). The optical path switching control unit 231 of the switching device 13b notifies the aggregation station 15 of the optical path switching destination information (step S2005). Subsequently, the processes from steps S507 to S520 are executed.

[0178] When the optical path switching is complete, radio station 12 sends an optical path switching completion notification to switching device 13b (step S2006). When the optical path switching is complete, distributed station 14-1 sends an optical path switching completion notification to switching device 13b (step S2007). When the optical path switching is complete, distributed station 14-2 sends an optical path switching completion notification to switching device 13b (step S2008).

[0179] (Fourth embodiment) In the fourth embodiment, the configuration differs from the first embodiment in that the cooperation information further includes information on the transmission delay between the terminal 11 and each distributed station 14.

[0180] Figure 27 shows an example configuration of the mobile network system 100d in the fourth embodiment. The mobile network system 100d in the fourth embodiment comprises one or more radio stations 12, a switching device 13, a plurality of distributed stations 14, an aggregation station 15, a core device 16, and a management control device 20d. The management control device 20d comprises a collaborative information collection unit 21d, an analysis unit 22d, and a control unit 23.

[0181] The collaborative information collection unit 21d comprises an acquisition unit 211 and a delay measurement unit 213d. The delay measurement unit 213d measures the transmission delay between the terminal 11 and each distributed station 14. For example, the delay measurement unit 213d measures the transmission delay between the terminal 11 and each distributed station 14 based on the RTT (Round-Trip Time) obtained as a result of sending a Ping. The delay measurement unit 213d outputs the propagation delay information measured for each distributed station 14 as collaborative information to the analysis unit 22d.

[0182] The analysis unit 22d comprises a collaboration information storage unit 221 and a real-time analysis unit 222d. Based on the collaboration information, the real-time analysis unit 222d analyzes the communication status in the mobile NW system 100d, such as the amount of change in the number of connections of the distributed station 14 per unit time. Specifically, the real-time analysis unit 222d divides the delay time by the current number of connected terminals to estimate the delay time per terminal. Furthermore, the real-time analysis unit 222d multiplies the number of connected terminals of other distributed stations 14 by the delay time per terminal of the target distributed station 14, and determines optical path switching and sleep mode if the delay time does not exceed a threshold and the number of connected terminals of that distributed station 14 is less than the number of additional terminals that the target distributed station 14 can accommodate.

[0183] Figure 28 is a flowchart showing an example of the sleep process flow executed by the management control device 20d in the fourth embodiment. In Figure 28, processes similar to those in Figure 3 are denoted by the same reference numerals as in Figure 3, and their explanation is omitted.

[0184] The delay measurement unit 213d measures the transmission delay between terminal 11 and each distributed station 14 (step S2101). The cooperation information collection unit 21d acquires cooperation information from each distributed station 14 (step S2102). Specifically, the acquisition unit 211 acquires information on at least the number of terminals accommodated and information on the maximum number of terminals accommodated, etc., as cooperation information from each distributed station 14. The cooperation information collection unit 21d stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221 (step S2103). Specifically, in addition to the cooperation information including information on at least the number of terminals accommodated and information on the maximum number of terminals accommodated, etc., the cooperation information collection unit 21d stores information on the transmission delay between terminal 11 and each distributed station 14 as cooperation information in the cooperation information storage unit 221.

[0185] The real-time analysis unit 222d calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S2104). Furthermore, the real-time analysis unit 222d estimates the delay time for each distributed station 14 based on the transmission delay information between the terminal 11 and each distributed station 14 stored in the cooperation information storage unit 221 (step S2105).

[0186] The real-time analysis unit 222d determines whether the fourth switching condition has been met (step S2106). The fourth switching condition is a condition indicating that a switch in the optical path between the radio station 12 and the distributed station 14 is necessary, for example, that the number of additional terminals that a certain distributed station 14 can accommodate is greater than the number of terminals that the distributed station 14 subject to sleep determination can accommodate, and that the transmission delay does not exceed a threshold.

[0187] If the real-time analysis unit 222d determines that the fourth switching condition is met (step S2106-YES), it executes the processes from step S105 onwards. On the other hand, if the real-time analysis unit 222d determines that the second switching condition is not met (step S2106-NO), it executes the processes from step S107 onwards.

[0188] Figure 29 is a flowchart showing an example of the sleep process flow executed by the management control device 20d in the fourth embodiment. The process shown in Figure 29 is described in more detail than the process shown in Figure 28. In Figure 29, processes similar to those in Figure 4 are denoted by the same reference numerals as in Figure 4 and their explanation is omitted.

[0189] The delay measurement unit 213d measures the transmission delay between terminal 11 and each distributed station 14 (step S2201). The acquisition unit 211 acquires information from each distributed station 14 as linked information, including the maximum number of terminals each distributed station can accommodate, connected radio station information, and the number of terminals each distributed station can accommodate (step S2202).

[0190] The acquisition unit 211 stores the acquired cooperation information for each distributed station 14 in the cooperation information storage unit 221 (step S2203). The real-time analysis unit 222d calculates the number of additional terminals that each distributed station 14 can accommodate based on the cooperation information for each distributed station 14 stored in the cooperation information storage unit 221 (step S2204). Furthermore, the real-time analysis unit 222d estimates the transmission delay per unit of each distributed station 14 based on the measured transmission delay information between the terminal 11 and each distributed station 14 (step S2205).

[0191] Specifically, the real-time analysis unit 222d processes the transmission delay value T of the distributed station 14-i obtained in step S2201. i The number of terminals connected to distributed station 14-i is u i Divide by (T i / u i ) By doing so, the transmission delay t per distributed station 14-i i Next, the real-time analysis unit 222d substitutes the value 1 for the constant i (step S2206). Next, the real-time analysis unit 222d substitutes the value (i+1) for k (step S2207).

[0192] Subsequently, the real-time analysis unit 222d U i -u i >u k , and, T>t i ×(u i +uk Determine whether or not the condition is met (step S2208). In the fourth embodiment, t i This is the transmission delay t per distributed station 14-i. i It represents U i -u i >u k , and, T>t i ×(u i +u k The conditions indicated by ) are specific examples of the fourth switching condition. If the real-time analysis unit 222d determines that the fourth switching condition is met (step S2208-YES), it executes the processes from step S207 onwards. On the other hand, if the real-time analysis unit 222d determines that the second switching condition is not met (step S2208-NO), it executes the processes from step S209 onwards.

[0193] Figure 30 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100d in the fourth embodiment. In Figure 30, processes similar to those in Figure 5 are denoted by the same reference numerals as in Figure 5, and their explanation is omitted. In the explanation of Figure 30, distributed station 14-1 is assumed to be the destination distributed station, and distributed station 14-2 is assumed to be the source distributed station. Here, they will be referred to as destination distributed station 14-1 and source distributed station 14-2.

[0194] The coordination information collection unit 21d of the management control device 20d acquires coordination information from the switching destination distributed station 14-1 and the switching source distributed station 14-2 at predetermined intervals (steps S2301 and S2302). The coordination information acquired in steps S2301 and S2302 shall include at least information on the number of connected terminals, information on the maximum number of connected terminals, and information on the transmission delay between terminal 11 and each distributed station 14. The coordination information collection unit 21d stores the acquired coordination information in the coordination information storage unit 221.

[0195] When the real-time analysis unit 222d stores the linkage information storage unit 221, it performs optical path switching and sleep control determination (step S2303). The optical path switching and sleep control determination in step S2303 is a determination of whether or not the fourth switching condition in step S2106 has been met. Here, let's assume that the fourth switching condition in step S2106 has been met. If the fourth switching condition has been met, the real-time analysis unit 222d executes the processing from step S304 onwards.

[0196] Figure 31 is a flowchart showing an example of the sleep wake-up process performed by the management control device 20d in the fourth embodiment. In Figure 31, processes similar to those in Figure 6 are denoted by the same reference numerals as in Figure 6, and their explanation is omitted.

[0197] The delay measurement unit 213d measures the transmission delay between terminal 11 and each distributed station 14 (step S2401). The acquisition unit 211 acquires information on the number of connected terminals and the sleeping distributed stations 14-k from each distributed station 14 as linked information (step S2402). The acquisition unit 211 notifies the analysis unit 22d of the acquired information on the number of connected terminals, the sleeping distributed stations 14-k, and the transmission delay.

[0198] The real-time analysis unit 222d of the analysis unit 22d reads information from the cooperation information storage unit 221 about the maximum number of terminals that each distributed station 14 can accommodate and information about the radio station 12 that was connected to the sleeping distributed station 14-k (step S2403). Based on the cooperation information for each distributed station 14 obtained, the real-time analysis unit 222d calculates the number of additional terminals that each distributed station 14 can accommodate (step S2404).

[0199] Next, the real-time analysis unit 222d substitutes the value 1 for the constant i (step S2405). The real-time analysis unit 222d then performs the analysis. i i , or T <t i Determine whether any of the following conditions are met (step S2406). i i , or T <t i ​​The conditions shown are specific examples of the fourth sleep wake-up condition. In the fourth sleep wake-up condition, T <t i This means that the transmission delay between terminal 11 and distributed station 14-i has exceeded the threshold. In other words, the transmission delay t per distributed station 14-i i This means that the threshold has been exceeded.

[0200] The real-time analysis unit 222d determines the fourth sleep wake-up condition (for example, U i i , or T <t i If it is determined that the condition is met (step S2406-YES), it is determined that switching of the optical path and waking up the sleeping distributed station 14-k are necessary.

[0201] The real-time analysis unit 222d notifies the control unit 23 of the determination result. Subsequently, the processing from step S406 onwards is executed. Meanwhile, the real-time analysis unit 222d determines the fourth sleep release condition (for example, U i i , or T <t i If it is determined that the condition is not met (step S2406-NO), the process in step S408 is executed.

[0202] Figure 32 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100d in the fourth embodiment. In Figure 32, processes similar to those in Figure 7 are denoted by the same reference numerals as in Figure 7 and their explanation is omitted. In the explanation of Figure 32, it is assumed that the distributed station 14-2 is in a sleep state.

[0203] Distributed station 14-2 is in a sleep state (step S501). The cooperation information collection unit 21d of the management control device 20d acquires cooperation information from distributed station 14-1 at predetermined intervals (step S2501). The cooperation information acquired in step S2501 includes at least information on the number of connected terminals, information on the maximum number of connected terminals, etc., as well as information on the transmission delay between terminal 11 and each distributed station 14. The cooperation information collection unit 21d stores the acquired cooperation information in the cooperation information storage unit 221.​​

[0204] When the real-time analysis unit 222d stores the linkage information storage unit 221, it performs optical path switching and sleep control determination (step S2502). The optical path switching and sleep control determination in step S2502 is whether or not the sleep release condition has been met. Here, let's assume that the sleep release condition has been met. If the sleep release condition has been met, the real-time analysis unit 222d executes the processing from step S504 onwards.

[0205] With the mobile network system 100d configured as described above, the same effects as in the first embodiment can be obtained. Specifically, in the mobile network system 100d, the management control device 20d further acquires information on the transmission delay between the terminal 11 and each distributed station 14 as cooperation information, and determines whether or not to switch optical paths based on the cooperation information. If the management control device 20d determines that switching optical paths is necessary, it controls the switching of optical paths between one or more radio stations 12 and multiple distributed stations 14. Furthermore, after the optical path switching has been performed, the management control device 20d puts distributed stations that can enter sleep mode into sleep mode. This allows for the control of optical path switching and sleep mode while analyzing the load of each distributed station 14. Therefore, it becomes possible to efficiently achieve power saving as a whole system.

[0206] (Modification 1 in the fourth embodiment) In the embodiment described above, the management control device 20d is shown to directly acquire cooperation information from the distributed station 14. The management control device 20d may also acquire cooperation information via other devices. Here, other devices are, for example, wireless controllers. In this configuration, the mobile NW system 100d is newly equipped with a wireless controller 30a, and the wireless controller 30a is provided between the management control device 20d and the distributed station 14.

[0207] The wireless controller 30a acquires cooperation information from each distributed station 14 at predetermined intervals via wireless communication. The wireless controller 30a transmits the acquired cooperation information to the management control device 20d via wireless communication. Alternatively, the wireless controller 30a may receive a sleep control instruction from the management control device 20d and transmit it to the switching source distributed station. This configuration allows for the collection of collaborative information via wireless communication.

[0208] (Modification 2 in the fourth embodiment) In the embodiment described above, the management control device 20d is configured to perform optical path switching control processing and sleep control processing. In contrast, the switching device 13 may be configured to perform optical path switching control processing and sleep control processing. In this configuration, the switching device 13 includes a control unit 23, while the management control device 20d does not include a control unit 23. The real-time analysis unit 222d of the management control device 20d notifies the switching device 13 of the analysis results. The real-time analysis unit 222d may notify the switching device 13 of the analysis results only when optical path switching and sleep control are performed. The control unit 23 of the switching device 13 performs optical path switching control processing and sleep control processing based on the analysis results notified from the management control device 20d.

[0209] Figure 33 is a sequence diagram showing an example of a detailed flow of the sleep process performed by the mobile NW system 100d in a modified example 2 of the fourth embodiment. In Figure 33, processes similar to those in Figure 30 are denoted by the same reference numerals as in Figure 30 and their explanation is omitted.

[0210] After the processes from step S2301 to step S2303 are executed, the real-time analysis unit 222d instructs the switching device 13b to perform optical path switching control and sleep control if the fourth switching condition is met (step S2601). The switching device 13b receives the instruction transmitted from the management control device 20d.

[0211] The optical path switching control unit 231 of the switching device 13b determines the destination of the optical path from the information contained in the received instruction (step S2602). The optical path switching control unit 231 notifies the aggregation station 15 of the optical path switching destination information (step S2603). Subsequently, the optical path switching control unit 231 instructs the radio station 12 connected to the source distributed station 14-2, the destination distributed station 14-1, and the source distributed station 14-2 to switch the optical path (step S2604). After that, the processes from steps S306 to S317 are executed.

[0212] When the optical path switching is complete, the radio station 12 sends an optical path switching completion notification to the switching device 13b (step S2605). The radio station 12 may also send the optical path switching completion notification to the management control device 20d. When the switching destination distributed station 14-1 is complete, it sends an optical path switching completion notification to the switching device 13 (step S2606). The radio station 12 may also send the optical path switching completion notification to the management control device 20d.

[0213] When the sleep control unit 232 of the switching device 13b receives an optical path switching completion notification from the destination of the optical path switching start notification, it sends a sleep permission notification to the switching source distributed station 14-2 (step S2607). When the switching source distributed station 14-2 receives the sleep permission notification from the switching device 13, it sends a sleep response notification to the switching device 13b (step S2608). After sending the sleep response notification, the switching source distributed station 14-2 enters a sleep state (step S322).

[0214] Figure 34 is a sequence diagram showing an example of a detailed flow of the sleep wake-up process performed by the mobile NW system 100d in a modified example 2 of the fourth embodiment. In Figure 34, processes similar to those in Figure 31 are denoted by the same reference numerals as in Figure 31 and their explanations are omitted. Note that in the explanation of Figure 31, it is assumed that the distributed station 14-2 is in a sleep state.

[0215] After the processes of step S501, step S2501, and step S2502 are executed, when the sleep release condition is satisfied, the real-time analysis unit 222d instructs the switching device 13b to perform optical path switching control and sleep control (step S2701). The switching device 13b receives the instruction transmitted from the management control device 20d.

[0216] The sleep control unit 232 of the switching device 13b transmits a sleep release notification to the distributed station 14-2 based on the information included in the received instruction (step S2702). In response to receiving the sleep release notification, the distributed station 14-2 transmits a sleep release response notification to the switching device 13b (step S2703).

[0217] The optical path switching control unit 231 of the switching device 13b determines the optical path switching destination from the information included in the received instruction (step S2704). The optical path switching control unit 231 of the switching device 13b notifies the aggregation station 15 of the optical path switching destination information (step S2705). Thereafter, the processes from step S507 to step S520 are executed.

[0218] When the optical path switching is completed, the radio station 12 transmits an optical path switching completion notification to the switching device 13b (step S2706). When the optical path switching is completed, the distributed station 14-1 transmits an optical path switching completion notification to the switching device 13b (step S2707). When the optical path switching is completed, the distributed station 14-2 transmits an optical path switching completion notification to the switching device 13b (step S2708).

[0219] (Modification Example 1 Common to the First to Fourth Embodiments) The mobile NW systems 100, 100a, 100c, and 100d do not need to be equipped with a switching device 13. In this configuration, each radio station 12 and each aggregation station 15 are connected in advance in a full-mesh network configuration. Furthermore, when switching optical paths, the optical path switching control unit 231 instructs the radio stations 12 and distributed stations 14 that are subject to optical path switching to switch the optical path. For example, the optical path switching control unit 231 transmits an optical path switching instruction (for example, the process in step S305 of Figure 5) to the radio stations 12 and distributed stations 14 that are subject to optical path switching, and after receiving an optical path switching response notification from the radio stations 12 and distributed stations 14, it transmits an optical path switching start notification (for example, the process in step S312 of Figure 5) to the radio stations 12 and distributed stations 14 that are subject to optical path switching.

[0220] (Modification 2 common to the first to fourth embodiments) In each embodiment, the configuration is shown in which the source distributed station transitions to a sleep state triggered by the management control devices 20, 20c, and 20d issuing a sleep instruction to the source distributed station. The source distributed station may be configured to autonomously transition to a sleep state without a sleep instruction from the management control devices 20, 20c, and 20d. In this configuration, the source distributed station autonomously transitions to a sleep state when the autonomous sleep conditions are met. The autonomous sleep conditions are the conditions for the source distributed station to autonomously transition to a sleep state, such as the absence of radio stations 12 connected to the device (the number of radio stations 12 connected to the device being 0), or the absence of traffic during a certain period of time ΔT. In this configuration, the source distributed station is equipped with a sleep control unit. The sleep control unit equipped in the source distributed station causes the device to transition to a sleep state when the autonomous sleep conditions are met. This configuration is also applicable when the switching device 13b is equipped with a control unit 23.

[0221] In addition to the number of connected terminals, the information collected by the management control devices 20, 20c, and 20d can also include the number of terminals at each distributed station 14, the number of terminals at each radio station 12, the actual traffic volume, and a value obtained by multiplying the number of connected terminals by the average throughput of one terminal.

[0222] At least some or all of the functional units of the management control devices 20, 20b, 20c, and 20d, or some or all of the functional units of the switching devices 13 and 13b, are implemented as software by a processor such as a CPU (Central Processing Unit) executing a program stored in a storage device and a memory unit having a non-volatile recording medium (non-temporary recording medium). The program may be recorded on a computer-readable non-temporary recording medium. A computer-readable non-temporary recording medium is, for example, a portable medium such as a flexible disk, magneto-optical disk, ROM (Read Only Memory), CD-ROM (Compact Disc Read Only Memory), or a storage device such as a hard disk built into a computer system.

[0223] At least some or all of the functional units of the management control devices 20, 20b, 20c, and 20d, or some or all of the functional units of the switching devices 13 and 13b, may be implemented using hardware including electronic circuits (or circuits) such as LSI (Large Scale Integrated Circuit), ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), or FPGA (Field Programmable Gate Array).

[0224] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and includes designs and the like that do not depart from the spirit of this invention. [Industrial applicability]

[0225] This invention can be applied to optical communication systems such as optical access systems. [Explanation of Symbols]

[0226] 11…Terminal, 12, 12-1~12-4…Radio Station, 13, 13b…Switching Device, 14, 14-1~14-2…Distributed Station, 15…Aggregation Station, 16…Core Device, 20, 20b, 20c, 20d…Management Control Device, 21, 21c, 21d…Cooperation Information Collection Unit 21, 22…Analysis Unit, 23…Control Unit, 30a…Radio Controller, 100, 100a, 100c, 100d…Mobile NW System, 211…Acquisition Unit, 212c…Distributed Station Monitoring Unit, 213d…Delay Measurement Unit, 221…Cooperation Information Storage Unit, 222…Real-time Analysis Unit, 231…Optical Path Switching Control Unit, 232…Sleep Control Unit

Claims

1. One or more radio stations that communicate wirelessly with one or more terminals, Multiple distributed stations connected directly to the aforementioned one or more radio stations or via other devices, A cooperation information collection unit that acquires cooperation information from each of the aforementioned multiple distributed stations to be used for either sleep determination or optical path switching determination, When it is determined that switching of optical paths between the one or more radio stations and the multiple distributed stations is necessary based on the aforementioned coordination information, an optical path switching control unit controls the switching of optical paths between the one or more radio stations and the multiple distributed stations, After the optical path is switched, a sleep control unit is used to put distributed stations that are capable of going into sleep mode into sleep mode, Equipped with, The aforementioned collaborative information includes at least information on the number of terminals accommodated per distributed station and information on the maximum number of terminals accommodated per distributed station. The system further includes an analysis unit that determines, based on information on the number of terminals accommodated by each distributed station and information on the maximum number of terminals accommodated by each distributed station, whether switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary if all terminals accommodated by the distributed station subject to sleep determination can be accommodated by other distributed stations. The optical path switching control unit controls the switching of optical paths so that the radio station connected to the distributed station subject to the sleep determination is connected to the other distributed station. The sleep control unit transitions the distributed station subject to the sleep determination to a sleep state as a distributed station capable of sleep, The aforementioned collaborative information further includes at least one of the following: processing load information relating to the processing load for each distributed station, or information on transmission delay between one or more terminals and the multiple distributed stations. The analysis unit determines, based on the information on the number of terminals accommodated by each distributed station, the information on the maximum number of terminals accommodated by each distributed station, and the processing load information or transmission delay information, that switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary if all terminals accommodated by the distributed station subject to sleep determination can be accommodated by other distributed stations. Communication system.

2. The processing load information includes information on the memory usage rate for each distributed station. The communication system according to claim 1.

3. A cooperation information collection unit that acquires cooperation information used for either sleep determination or optical path switching determination from each of multiple distributed stations that are directly or via other devices connected to one or more wireless stations that communicate wirelessly with one or more terminals, Based on the aforementioned coordination information, if it is determined that switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary, an optical path switching control unit controls the switching of the optical path between the one or more radio stations and the multiple distributed stations. After the optical path is switched, a sleep control unit is used to put distributed stations that are capable of going into sleep mode into sleep mode, Equipped with, The aforementioned collaborative information collection unit is a management control device that acquires the collaborative information via a wireless controller that performs wireless communication with each of the multiple distributed stations.

4. One or more radio stations that communicate wirelessly with one or more terminals, Multiple distributed stations connected directly to the aforementioned one or more radio stations or via other devices, A cooperation information collection unit that acquires cooperation information used for determining the switching of optical paths from each of the aforementioned multiple distributed stations, When it is determined that switching of optical paths between the one or more radio stations and the multiple distributed stations is necessary based on the aforementioned coordination information, an optical path switching control unit controls the switching of optical paths between the one or more radio stations and the multiple distributed stations, Equipped with, The aforementioned collaborative information collection unit is a communication system that acquires the collaborative information via a wireless controller that performs wireless communication with each of the multiple distributed stations.

5. A distributed station connected to a radio station that communicates wirelessly with one or more terminals, A transmitting unit that transmits coordination information used for determining the switching of at least one optical path to a management control device, A receiving unit that receives an optical path switching instruction between the radio station and the distributed station, indicating that the management control device has determined, based on the cooperation information, that it is necessary to switch the optical path between the radio station and the distributed station. A sleep processing unit that transitions to a sleep state after the optical path is switched according to the optical path switching instruction, Equipped with, The transmitting unit is a distributed station that transmits the cooperation information to the management control unit via a wireless controller that communicates wirelessly with the device.

6. A control method performed by a distributed station connected to a radio station that communicates wirelessly with one or more terminals, At least the coordination information used to determine the switching of the optical path is transmitted to the management control unit via a wireless controller that communicates wirelessly with the device itself. The management control device receives an optical path switching instruction between the radio station and the distributed station, indicating that it has determined, based on the cooperation information, that it is necessary to switch the optical path between the radio station and the distributed station. After the optical path is switched according to the optical path switching instruction, the system enters sleep mode. Control method.

7. A cooperation information collection unit that acquires cooperation information used for determining optical path switching from each of several distributed stations that are directly or via other devices connected to one or more radio stations that communicate wirelessly with one or more terminals, Based on the aforementioned coordination information, if it is determined that switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary, an optical path switching control unit controls the switching of the optical path between the one or more radio stations and the multiple distributed stations. Equipped with, The aforementioned collaborative information collection unit is a management control device that acquires the collaborative information via a wireless controller that performs wireless communication with each of the multiple distributed stations.

8. A distributed station connected to a radio station that communicates wirelessly with one or more terminals, A transmitting unit that transmits to a management control device cooperative information, which is a combination of information about the connected radio station and information about the communication of the distributed station, to be used at least for determining the switching of optical paths, A receiving unit that receives an optical path switching instruction between the radio station and the distributed station, indicating that the management control device has determined, based on the cooperation information, that it is necessary to switch the optical path between the radio station and the distributed station. A distributed station equipped with these features.

9. One or more radio stations that communicate wirelessly with one or more terminals, Multiple distributed stations connected directly to the aforementioned one or more radio stations or via other devices, A cooperation information collection unit acquires cooperation information from each of the multiple distributed stations, which is a combination of information about one or more radio stations connected to the multiple distributed stations and information about the communication of the multiple distributed stations, used for determining the switching of optical paths. When it is determined that switching of optical paths between the one or more radio stations and the multiple distributed stations is necessary based on the aforementioned coordination information, an optical path switching control unit controls the switching of optical paths between the one or more radio stations and the multiple distributed stations, A communication system equipped with [the following features].

10. A cooperation information collection unit acquires cooperation information, which is a combination of information about the one or more radio stations connected to the multiple distributed stations and information about the communication of the multiple distributed stations, from each of the multiple distributed stations connected directly or via other devices to one or more radio stations that communicate wirelessly with one or more terminals, for use in determining the switching of optical paths. Based on the aforementioned coordination information, if it is determined that switching of the optical path between the one or more radio stations and the multiple distributed stations is necessary, an optical path switching control unit controls the switching of the optical path between the one or more radio stations and the multiple distributed stations. A control and management device equipped with the following features.

11. A distributed station connected to a radio station that communicates wirelessly with one or more terminals, A transmitting unit that transmits to a management control device cooperative information, which is a combination of information about the connected radio station and information about the communication of the distributed station, to be used at least for determining the switching of optical paths, A receiving unit that receives an optical path switching instruction between the radio station and the distributed station, indicating that the management control device has determined, based on the cooperation information, that it is necessary to switch the optical path between the radio station and the distributed station. A sleep processing unit that transitions to a sleep state after the optical path is switched according to the optical path switching instruction, A distributed station equipped with these features.

12. One or more radio stations that communicate wirelessly with one or more terminals, Multiple distributed stations connected directly to the aforementioned one or more radio stations or via other devices, A management control device connected to each of the aforementioned multiple distributed stations, A controller that receives a sleep control instruction transmitted from the management control device and, in accordance with the received sleep instruction, puts distributed stations capable of going into sleep mode into sleep mode. Equipped with, The aforementioned control device is A cooperation information collection unit that acquires cooperation information used for determining the switching of optical paths from each of the aforementioned multiple distributed stations, When it is determined that switching of optical paths between the one or more radio stations and the multiple distributed stations is necessary based on the aforementioned coordination information, an optical path switching control unit controls the switching of optical paths between the one or more radio stations and the multiple distributed stations, A sleep control unit that transmits the sleep control instruction to the controller, A communication system equipped with [the following features].

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