Communication control device, communication control method, and communication control program

Abstract

To set an appropriate communication line according to the required communication quality.SOLUTION: A selection unit 503 selects, for each required communication quality, an earth station whose communication link with a communication satellite satisfies a required communication quality from among a plurality of earth stations located at different locations as a selected earth station. A link setting unit 504 sets, for each required communication quality, a communication link that satisfies the required communication quality between the communication satellite and the selected earth station as a set communication link.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present disclosure relates to communication using a communication satellite (hereinafter, also simply referred to as a satellite). For example, the present disclosure relates to a technology for providing a satellite backhaul line that connects a base station and a core network via a satellite repeater having a digital channelizer function in NTN. Note that "NTN" means "Non-Terrestrial Network". NTN connects a terrestrial communication system such as a 5G cellular communication system and a satellite communication system. In addition, the "digital channelizer function" is a function of relaying and transmitting a signal received in a frequency band within a reception beam to a frequency band of an arbitrary transmission beam.

Background Art

[0002] In a conventional 5G cellular communication system, as shown in Non-Patent Document 1, only one 5QI for transmission using a communication line of a communication satellite is defined among a plurality of defined 5QIs. 5QI is an identifier corresponding to a QoS flow. "QoS" means "Quality of Service". Therefore, for information transmitted on the communication line of the communication satellite, the same communication quality is required for delay and error rate regardless of applications such as voice and mail. For example, 5QI = 10: PDB ≤ 1100 ms, PER ≤ 10 -6 is satisfied. Therefore, as a satellite backhaul line, it is sufficient to control so as to satisfy the required quality of the QoS flow by preparing one communication line for the forward link and the return link.

[0003] On the other hand, in the technology of Patent Document 1, a plurality of different communication lines are set between a set of transmission points and reception points. In addition, in the technology of Patent Document 1, an integrated radio interface capable of offloading transmission data is provided. Furthermore, in the technology described in Patent Document 1, traffic adjustment is performed between communication lines while adjusting the frequency bandwidth of multiple communication lines. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 6433089 [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP(registered trademark) TS23.501 V17.6.0 [Overview of the project] [Problems that the invention aims to solve]

[0006] Unlike the technology described in Non-Patent Document 1, transmitting data with different required communication quality, such as voice data and email data, requires setting up multiple communication lines according to the required communication quality. In the technology described in Patent Document 1, multiple communication lines are set up between a pair of transmitting and receiving points. Therefore, in the technology described in Patent Document 1, if the communication environment between the transmitting and receiving points changes, all of the multiple communication lines will be affected by the change. Even when the technology described in Patent Document 1 is applied to satellite communications and multiple communication lines are established between two earth stations via satellite repeaters, similar changes in transmission quality occur across multiple communication lines due to changes in the communication environment caused by rainfall, etc. In such cases, depending on the data being transmitted, it may become impossible to meet the required communication quality in the changed communication environment. For example, with data that has a low tolerance for errors, such as email data, it may become impossible to meet the required communication quality.

[0007] This disclosure is made in light of these circumstances. More specifically, the main purpose of this disclosure is to configure appropriate communication lines according to the required communication quality. [Means for solving the problem]

[0008] The communication control device relating to this disclosure is For each required communication quality, a selection unit selects an earth station from among multiple earth stations, each located in a different place, that will have a communication link with the communication satellite that meets the required communication quality. The system includes a line setting unit that, for each requested communication quality, sets up a communication line that meets the requested communication quality between the communication satellite and the selected earth station as a set communication line. [Effects of the Invention]

[0009] According to this disclosure, an appropriate communication line can be set according to the required communication quality. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example of a satellite communication connectivity system according to Embodiment 1. [Figure 2] This figure shows a case in which a single QoS flow classification is transmitted in the satellite communication connectivity system according to Embodiment 1. [Figure 3] This figure shows how multiple QoS flow classifications are transmitted between a single GW station and a satellite communication connectivity system according to Embodiment 1. [Figure 4] This figure shows how multiple QoS flow classifications are transmitted between multiple gateway stations in the satellite communication connectivity system according to Embodiment 1. [Figure 5] This diagram shows the functions of a satellite backhaul station and a base station according to Embodiment 1. [Figure 6] This diagram shows a GW management device arranged in a satellite communication connectivity system according to Embodiment 1. [Figure 7] This figure shows an example of the hardware configuration of the GW management device according to Embodiment 1. [Figure 8] This figure shows an example of the functional configuration of the GW management device according to Embodiment 1. [Figure 9]It is a diagram showing an example of the procedure for a satellite backhaul station to make an initial connection in the satellite communication connection system according to Embodiment 1. [Figure 10] It is a diagram showing the frequency band control of the satellite repeater according to Embodiment 1. [Figure 11] It is a diagram showing an example of the procedure for changing the destination GW by a satellite backhaul station trigger in the satellite communication connection system according to Embodiment 1. [Figure 12] It is a diagram showing an example of the procedure for changing the destination GW by a GW trigger in the satellite communication connection system according to Embodiment 1. [Figure 13] It is a flowchart showing an operation example in the measurement information collection procedure of the GW management device according to Embodiment 1. [Figure 14] It is a flowchart showing an operation example of the GW management device after receiving a connection request according to Embodiment 1. [Figure 15] It is a flowchart showing an operation example of the GW management device after receiving a quality change request according to Embodiment 1. [Figure 16] It is a diagram showing a method for performing quality measurement of a feeder link according to Embodiment 1. [Figure 17] It is a diagram showing a method for managing quality measurement information according to Embodiment 1.

Mode for Carrying Out the Invention

[0011] In the present embodiment, a satellite backhaul line that connects a base station such as a cellular communication system to a core network via a satellite repeater is realized. For example, in the present embodiment, HTS is used. "HTS" means "High Throughput Satellites". In HTS, high-capacity satellite communication is provided using a high-frequency band such as the Ka band. And in the present embodiment, as a satellite backhaul line, QoS flows of a plurality of users connected to a base station are grouped into QoS flows of the same quality. Also, in the present embodiment, communication lines with different frequency bands are assigned to QoS flows that require different error rates and delays. Furthermore, in this embodiment, the connection destination is switched for each communication line so that the error rate and delay of the communication line meet the error rate and delay requirements of QoS.

[0012] With this configuration, according to this embodiment, it is possible to appropriately select a feeder link earth station / gateway station (hereinafter collectively referred to as GW) to which the communication line is connected, so as to satisfy the error rate and delay required for the QoS flow in response to changes in the wireless environment due to rainfall, etc.

[0013] This embodiment will be described below with reference to the drawings. In the following description of the embodiment and in the drawings, the same reference numerals indicate the same part or a corresponding part.

[0014] Embodiment 1. ***Explanation of the structure*** Figure 1 shows an example of a satellite communication connectivity system according to this embodiment.

[0015] User terminals 1-1, 1-2, and 1-3 are user terminals in a terrestrial cellular communication system. User terminals 1-1, 1-2, and 1-3 access base station 2-1 and utilize various communication services. In addition to the locations shown in Figure 1, user terminals can also access base station 2-1 if they are located within cell 3-1, which is covered by base station 2-1. Similarly, user terminals 1-4 located in cell 3-2 can access other base stations 2-2.

[0016] Base stations 2-1 and 2-2 are connected to core network 4. Base stations 2-1 and 2-2 can conduct voice communication, for example, between user terminals 1-1 and 1-4, via core network 4. Core network 4 is also referred to as core NW. In addition to voice communication, it is also possible to send and receive emails and browse information on the web. Through the Internet 5, for example, user terminals 1-2 and 1-3 can access various servers 6-1 and 6-2, such as mail servers and web servers. Of course, a single user terminal can simultaneously use multiple communication services, such as voice communication and sending / receiving emails.

[0017] Here, base station 2-1 utilizes a satellite backhaul link provided by a satellite transponder 10 mounted on a communications satellite to connect to the core network 4. One use case for satellite backhaul links is when using cellular communication systems in areas where ground-based cellular communication signals cannot reach, such as for ships and aircraft. It can also enable the use of cellular communication systems even when connections to ground-based wired communication networks are disrupted due to disasters or other reasons. This use case, utilizing satellite backhaul links, is one application at NTN. Since base station 2-1 utilizes the satellite's communication link, it connects to the satellite backhaul station 12, which is the user earth station in the satellite communication system. The satellite backhaul station 12 transmits data by establishing a communication link (satellite backhaul link) with GW13-1 via the satellite transponder 10. When GW13-1 connects to core network 4, data transmission between base station 2-1 and core network 4 becomes possible. Furthermore, the satellite transponder 10 forms high-gain beam areas 11-1 and 11-2 toward the ground, enabling the satellite backhaul station 12 and the GW13-1 earth station to transmit and receive radio signals. In Figure 1, the satellite backhaul station 12 is shown to establish a communication link with GW13-1 to transmit data. If the feeder link between the satellite repeater 10 and GW13-1 cannot ensure the required communication quality due to rainfall or other reasons, the satellite backhaul station 12 can also establish a communication link with GW13-2, which is installed in beam area 11-3. Satellite backhaul stations 12, GW13-1, and GW13-2 are all earth stations. The locations of satellite backhaul stations 12, GW13-1, and GW13-2 are all different.

[0018] Furthermore, Figure 1 shows the satellite communications control station 14 that monitors and controls the satellite transponder 10. The satellite communications control station 14 is located in beam area 11-4, similar to the beam areas 11-1 to 11-3 described above. The satellite communications control station 14 receives monitoring signals and transmits control signals to the satellite transponder 10, thereby enabling changes to the configuration of the satellite transponder 10, such as changing the beam configuration.

[0019] Although not shown in Figure 1, the satellite communication connectivity system according to this embodiment also includes a GW management device 50. The GW management device 50 selects, from among multiple earth stations, an earth station whose communication line with the satellite repeater 10 (communication satellite) meets the required communication quality for each required communication quality. The required communication quality is, for example, QoS. The GW management device 50 also sets a communication line that meets the required communication quality as a set communication line between the satellite repeater 10 (communication satellite) and the selected earth station for each required communication quality. Details of the GW management device 50 will be described later.

[0020] Next, we will explain the communication link established between the satellite backhaul station 12 and GW13-1 using the simplest example shown in Figure 2. The configuration shown in Figure 2 corresponds to a typical prior art configuration. Figure 2 illustrates that the satellite communication connectivity system according to this embodiment is backward compatible with the prior art.

[0021] User terminal 1-1 is configured to use voice communication, and QoS flow 20-1 is set up to transmit voice data via the cellular communication system. Another user terminal 1-2 is configured to use email, and QoS flow 21-1 is set up. The packet error rates required for these QoS flows generally differ. For example, in voice communication, a certain amount of data loss is acceptable, so PER ≤ 10 is generally acceptable. ‐2 Communication is possible if the following conditions are met. On the other hand, in data communication such as email, data loss is not tolerated, and error correction by retransmission control etc. must be considered, so PER ≤ 10. ‐6 This is required. However, when transmitting QoS flows over satellite backhaul links, it is possible to consolidate these QoS flows under the same quality requirements. For example, a QoS flow with a lower packet error rate (PER ≤ 10) can be combined. ‐6 It is also possible to treat it as such. In such a case, one communication line 22 is set up between the satellite backhaul station 12 and GW13-1. Then, QoS flows 20-1 and 21-1 are transmitted over that communication line. Note that the packet error rate is generally defined as the end-to-end of the communication service, but here, for simplicity, it will be explained as the packet error rate in the satellite communication section.

[0022] Here, a communication link refers to either the forward link from GW13-1 to satellite backhaul station 12, or the return link from satellite backhaul station 12 to GW13-1. Each communication link is assigned a different frequency. However, this is not the case when the same frequency is repeatedly used in geographically separated areas; for simplicity, we will explain it as if each communication link has a different frequency. Furthermore, while typical bidirectional communication utilizes both forward and return links, some communication configurations may use only one of either the forward or return link for unidirectional communication. Additionally, the QoS (Quality of Service) of the forward and return links may differ. Moreover, communication lines may be shared by multiple satellite backhaul stations. For simplicity, in the following explanation, we will refer to a forward and return link with the same QoS for bidirectional communication as a single communication line, and assume that different satellite backhaul stations utilize different communication lines. Furthermore, the forward link and return link are divided into a service link between the satellite backhaul station 12 and the satellite transponder 10, and a feeder link between the satellite transponder 10 and GW13-1, respectively. The service link and the feeder link form communication lines at different frequencies.

[0023] The satellite transponder 10 achieves its relay function by converting and transmitting the frequencies of the service link and feeder link. Furthermore, while communication lines in satellite communications generally utilize SCPC, MF-TDMA, etc., as used in DVB-S2X and DVB-RSC2 standards, etc., they are not limited to these. "SCPC" stands for "Single Channel Per Carrier." "MF-TDMA" stands for "Multi Frequency-Time Division Multiple Access."

[0024] As mentioned above, the required packet error rates differ between voice communication and email. Furthermore, regarding latency requirements, while allowing for the transmission delay of satellite communication, a delay of about 1 second is practically acceptable for voice communication, while a delay of several seconds to several minutes is practical for email. In addition to voice communication and email, there are also services like web browsing and chat that fall somewhere in between these latency requirements, and a delay of a few seconds is considered practical for services using satellite communication. Therefore, it is conceivable that the 3GPP® standard may further subdivide the classification of QoS flows using satellite communications in the future. Furthermore, it is also conceivable that communication operators may independently subdivide the classification of QoS flows. Therefore, Figure 3 shows an example in which the classification of QoS flows is subdivided and communication lines of different frequencies are assigned according to the QoS according to this embodiment. For simplicity, Figure 3 explains an example in which the classification of QoS is divided into two categories: voice communication and email.

[0025] In Figure 3, QoS flow 20-1, which transmits voice data from user terminal 1-1, and QoS flow 21-1, which is used by user terminal 1-2 for email, are the same as in Figure 2. However, unlike Figure 2, each QoS flow is transmitted over different communication lines 23-1 and 23-2. Figure 3 further illustrates a case where user terminals 1-3 perform voice communication and email simultaneously. User terminals 1-3 shall configure QoS flow 20-2 for transmitting voice data. In this case, QoS flow 20-2 is transmitted over the same communication line 23-1 as QoS flow 20-1 of user terminal 1-1, which is performing voice communication. Furthermore, user terminals 1-3 are to configure a QoS flow 21-2 for transmitting email data. In this case, QoS flow 21-2 is transmitted over the same communication line 23-2 as QoS flow 21-1 of user terminal 1-2, which is sending the email. The method for determining which communication line to use to transmit each QoS flow will be described later. Note that the example in Figure 3 shows that both communication lines 23-1 and 23-2 are set up between the satellite backhaul station 12 and GW 13-1. Figure 3 demonstrates that even if the communication lines are divided into multiple lines, it is possible to set up multiple communication lines with the same GW depending on the resource allocation to the communication lines.

[0026] Next, using Figure 4, we will explain an example of connecting to an appropriate gateway that satisfies the required quality of service (QoS) for each communication line, depending on the error rate of the communication line.

[0027] Figure 4 shows the switching of communication lines when weather deteriorates (e.g., rainfall) in the area where GW13-1 is deployed. If the weather deteriorates after establishing communication lines 23-1 and 23-2 between GW13-1 and the current time, the error rate of communication lines 23-1 and 23-2 will worsen. Even under these circumstances, the required error rate for voice communication is PER ≤ 10. -2 If the above conditions are met, the required communication quality can be satisfied even if QoS flows 20-1 and 20-2 for transmitting voice data are transmitted over communication line 23-1. On the other hand, the communication line 23-2 (Figure 3) of QoS flows 21-1 and 21-2 that transmit email data has an error rate PER ≤ 10 -6If the conditions are not met, the required communication quality cannot be satisfied. In this case, the GW management device 50 selects another GW to be used as the GW for configuring the communication lines for QoS flows 21-1 and 21-2. In the example in Figure 4, GW 13-2 is located in an area with good weather conditions (e.g., sunny). Therefore, the GW management device 50 selects GW 13-2 and configures the communication lines for QoS flows 21-1 and 21-2 on GW 13-2. Specifically, the GW management device 50 connects communication line 23-3 to GW 13-2 as the communication line for QoS flows 21-1 and 21-2. The procedure for the GW management device 50 to select an alternative GW will be described later.

[0028] As shown in Figure 4, by assigning different frequency bands to QoS flows requiring different error rates as satellite backhaul links, it is possible to switch the connection destination for each communication link. Therefore, in response to changes in the wireless environment due to rainfall, etc., it is possible to appropriately select the gateway (GW) to which the communication link is connected in order to meet the error rate required for the QoS flow.

[0029] Next, we will explain, using Figure 5, how to determine which communication line to use to transmit each QoS flow.

[0030] Figure 5 shows the functions of base station 2-1 and satellite backhaul station 12 using a protocol stack. The user plane (U-Plane) functions that base station 2-1 uses to perform wireless communication with user terminals are PHY, MAC, RLC, PDCP, and SDAP as defined by 3GPP (registered trademark). A detailed explanation of the user plane functions is omitted, but the QoS flow handled in this embodiment can be identified by the QoS flow identifier (QFI). The QoS flow identifier (QFI) is the header information of the protocol data unit (PDU) handled by SDAP 40. Furthermore, base station 2-1 uses GTP-u, UDP, and IP as protocols for sending and receiving data with the core network 4 shown in Figure 1. IP31 handles the sending and receiving of IP packets. The "Data Link Layer" and "Physical Layer" are protocols for connecting base station 2-1 and satellite backhaul station 12, and Ethernet can be used. In the following explanation, these protocols will not be described in detail, and the process will be explained as IP layer packet transmission and reception. The satellite backhaul station 12 has an IP layer of IP40, but it transparently transmits IP packets destined for base station 2-1 or core network 4. Here, for IP packets 33-1 destined for core network 4 from base station 2-1, the QFI value identified by SDAP 40 is converted to a DSCP value in the IP packet by the QFI-DSCP conversion function 32. The QFI-DSCP conversion function 32 then sets the DSCP value in the TOS field. In this way, the satellite backhaul station 12 can also identify the QoS flow. Note that "DSCP" stands for "Diff Serve Code Point," and "TOS" stands for "Type of Service." The QoS isolation function 41 of the satellite backhaul station 12 refers to the DSCP value of the IP packet. The QoS isolation function 41 then distributes the packet to multiple modem functions, such as multiple modem functions 42-1 to 42-2 that configure and maintain the satellite communication line, for example, multiple modem functions 42-1 to 42-2 that support DVB-S2X. Here, modem function 42-1 handles the communication line that transmits the QoS flow for voice communication. Modem function 42-2 also handles the communication line that transmits the QoS flow for email. In this way, the QoS flow is mapped to the communication line. Each communication line is transmitted to the satellite transponder via an antenna 43 equipped with a signal amplifier.

[0031] For IP packets 33-2 destined for base station 2-1 from core network 4, the IP packets received by multiple modem functions of satellite backhaul station 12 are transmitted to base station 2-1's IP31 via QoS isolation function 41 and IP40. The QFI-DSCP conversion function 32 references the DSCP value in the TOS field attached to the IP packet 33-2 terminated with IP31. The QFI-DSCP conversion function 32 then converts the DSCP value into a QFI value handled by SDAP 30 and performs wireless communication with the user terminal.

[0032] The above describes how to determine which communication line to use to transmit each QoS flow between base station 2-1 and satellite backhaul station 12. In Figure 1, QoS flows can also be identified between the core network 4 and GW13-1 and 13-2 using the DSCP value in the IP header. Therefore, for example, GW13-1 can similarly determine which communication line to use for voice communication QoS flows and which communication line to use for email QoS flows.

[0033] Next, in explaining the procedure for selecting the gateway (GW) to which the communication line will be connected and configuring the communication line, the control functions required for the satellite communication connection system according to this embodiment will be explained using Figure 6.

[0034] In Figure 6, the satellite communications control station 14 monitors and controls the satellite transponder 10, as explained in Figure 1. As described above, the GW management device 50 selects a GW from among multiple GWs whose communication line to the satellite transponder 10 meets the required communication quality for each requested communication quality. The GW management device 50 also sets up a communication line that meets the required communication quality between the satellite transponder 10 and the selected GW for each requested communication quality. More specifically, the GW management device 50 connects to all GWs in the satellite communication connectivity system and collects carrier-to-noise ratio (C / N) information and frequency band information (information on available frequency bandwidth) from each GW. The carrier-to-noise ratio (C / N) information represents the result measured by each GW as the line quality of the feeder link. The frequency band information (information on available frequency bandwidth) indicates the available free frequency bandwidth managed by each GW. When there is a change in the values ​​held by each gateway (GW), this information is transmitted from each gateway to the gateway management device 50. In Figure 6, the GW management device 50 is shown separately from each GW, but the GW management device 50 may be placed in a single representative GW. Alternatively, the GW management device 50 may be placed in the satellite communications control station 14. The GW management device 50 corresponds to the communication control device described herein. Furthermore, the operating procedure of the GW management device 50 corresponds to the communication control method. Furthermore, the program that realizes the operation of the GW management device 50 corresponds to the communication control program. The other components shown in Figure 6 are the same as those described in Figure 1.

[0035] Figure 7 shows an example of the hardware configuration of the GW management device 50, and Figure 8 shows an example of the functional configuration of the GW management device 50.

[0036] The GW management device 50 is a computer. The GW management device 50 includes, as hardware, a processor 901, a main memory 902, an auxiliary memory 903, and a communication device 904. Furthermore, the GW management device 50 includes, as a functional configuration, a communication unit 501, a storage unit 502, a selection unit 503, and a line setting unit 504. The functions of the communication unit 501, the selection unit 503, and the line setting unit 504 are implemented, for example, by a program. The auxiliary storage device 903 stores programs that implement the functions of the communication unit 501, the selection unit 503, and the line setting unit 504. These programs are loaded from the auxiliary storage device 903 into the main memory device 902. The processor 901 then executes these programs to perform the operations of the communication unit 501, the selection unit 503, and the line setting unit 504, which will be described later. Figure 7 schematically shows the state in which the processor 901 is executing a program that implements the functions of the communication unit 501, the selection unit 503, and the line setting unit 504. Furthermore, the memory unit 502 is implemented, for example, by the main memory 902 and / or the auxiliary memory 903.

[0037] In Figure 8, the communication unit 501 communicates with the GW using the communication device 904. For example, the communication unit 501 receives C / N information and frequency band information from each GW. The communication unit 501 then stores the received C / N information and frequency band information in the storage unit 502. Furthermore, the communication unit 501 may receive a connection request from any of the gateways (GWs) requesting the configuration of a communication line. In addition, the communication unit 501 may send a communication line allocation instruction to any of the gateways instructing them to configure a communication line. Furthermore, if there is a problem with an existing communication line, the communications unit 501 may receive a quality change request from one of the gateways requesting a switch to a new communication line. In addition, the communications unit 501 may send a communication line allocation instruction to one of the gateways instructing a switch to a new communication line.

[0038] The memory unit 502 stores the C / N information and frequency band information received by the communication unit 501.

[0039] The selection unit 503 selects, for each requested quality of service (QoS), an earth station from among multiple earth stations (satellite backhaul station 12, GW13-1, 13-2) whose communication link with the satellite repeater 10 (communication satellite) meets the requested quality of service. The selection unit 503 can select a different earth station as the selected earth station for each requested quality of service. Furthermore, if the configured communication line, which is a communication line set by the line setting unit 504, fails to meet the corresponding required communication quality, the selection unit 503 selects a new selected earth station from among multiple earth stations, other than the selected earth station whose communication line to the satellite repeater 10 meets the corresponding required communication quality. The selection unit 503 selects a new selected earth station, for example, if the configured communication line fails to meet the corresponding required communication quality due to the communication environment of the selected earth station.

[0040] The circuit setting unit 504 sets a communication line that meets the required communication quality for each requested communication quality between the satellite repeater 10 and the selected earth station as a set communication line. The circuit setting unit 504 sets the set communication line as a communication line for multiple QoS flows (communication flows) to which the same requested communication quality applies for each requested communication quality. Furthermore, the circuit setting unit 504 sets up a new configured communication line when a new selected earth station is selected by the selection unit 503. In other words, for the corresponding requested communication quality, the circuit setting unit 504 sets up a new configured communication line between the satellite repeater 10 and the new selected earth station that satisfies the corresponding requested communication quality, instead of the configured communication line. In this case as well, the circuit setting unit 504 sets up the new configured communication line as the communication line for multiple QoS flows to which the corresponding requested communication quality applies.

[0041] ***Explanation of operation*** Figure 9 shows the procedure for selecting a gateway (GW) to connect to and configuring the communication line. In other words, Figure 9 is a diagram that explains how to determine which gateway to connect to. Figure 9 illustrates the process for simplicity, assuming that one gateway (GW) is selected for each communication line. When multiple communication lines are configured, a connection request is made using the information for each line, and one gateway is selected for each line.

[0042] When a request for a new communication line allocation occurs due to the initial startup of the satellite backhaul station 12 (new communication line allocation request occurrence 60), the satellite backhaul station 12 makes a connection request to GW13-3 (initial connection GW), which representatively manages the beam in which it is located. This connection request is necessary when allocating communication lines using a demand assignment method. If the frequency and other parameters of the communication line are statically determined by the line contract, etc., it is possible to connect to GW13-3 without making a connection request. This explanation assumes that communication lines can be dynamically configured / changed using a demand assignment method. Furthermore, the connection request includes QoS information and frequency bandwidth required for the communication line. Upon receiving the connection request, GW13-3 sends a connection request to the GW management device 50 in order to select the optimal destination GW according to the request.

[0043] As mentioned above, in the GW management device 50, the communication unit 501 collects C / N information and frequency band information (frequency free bandwidth information) in the measurement information collection procedure 100. The C / N information and frequency band information (frequency free bandwidth information) are stored in the storage unit 502. In Figure 9, the C / N information and frequency band information (frequency free bandwidth information) are referred to as "FL quality / free bandwidth information". Similarly, in Figures 11 and 12, the C / N information and frequency band information (frequency free bandwidth information) are also referred to as "FL quality / free bandwidth information".

[0044] The selection unit 503 uses this information to select the destination gateway (destination gateway determination procedure 70). For example, if the QoS information is a connection request for a communication line that performs voice communication, the selection unit 503 selects a GW that can be configured between the satellite repeater 10 and the communication line that satisfies the requested communication quality for voice communication. Specifically, the selection unit 503 selects a GW on the condition that the packet error rate estimated from the C / N of the feeder link satisfies the QoS requirement, and that there is still usable frequency bandwidth remaining in the frequency bandwidth of the inter-beam connection secured between the user beam for which the connection request was made and each GW. If there are multiple gateways (GWs) that meet the conditions, the selection unit 503 may, for example, select the gateway with the best C / N ratio among the gateways that meet the QoS requirement for packet error rate. Alternatively, the selection unit 503 may select gateways in a way that ensures load balancing without significant bias in the utilization of frequency resources among the gateways. Specifically, for communication lines where a high packet error rate is acceptable, such as voice communication, the selection unit 503 selects a gateway with a poor C / N ratio, provided that the QoS requirement is met. On the other hand, for communication lines that require a low packet error rate, such as email, the selection unit 503 selects a gateway with a good C / N ratio. The selection unit 503 may also select the gateway with the most available bandwidth, provided that the QoS requirement is met. Furthermore, as a method that combines the features of the above methods, the selection unit 503 may classify gateways according to the QoS requirement for error rate and select the gateway with the most available bandwidth among the gateways that meet the error rate requirement.

[0045] If, at this point, there is insufficient available frequency bandwidth among the frequency bandwidths reserved for inter-beam connections between the user beam for which a connection request has been made and each GW, the satellite transponder 10 configuration change procedure 80 is performed. In other words, the selection unit 503 requests a beamband change from the satellite communication control station 14 via the communication unit 501. If a beamband change is possible, the satellite communication control station 14 performs a satellite repeater setting change 81. The details of the process for changing the satellite repeater settings (81) will be described later. Once the beamband change is complete, the satellite communication control station 14 notifies the GW management device 50 of the completion of the change. The selection unit 503 receives the notification of completion of the change via the communication unit 501. The selection unit 503 then sends a repeater setting change notification to each GW via the communication unit 501. The repeater setting change notification may be sent only to the GWs related to the change.

[0046] Based on the above procedure, in this case, it is assumed that the selection unit 503 selected destination GW13-1 in the destination GW determination procedure 70. Destination GW13-1 corresponds to the selected earth station. The selection unit 503 notifies the line setting unit 504 that GW13-1 has been selected as the selected earth station. The line configuration unit 504 then generates a communication line allocation instruction that instructs the destination GW13-1 to configure (allocate) a communication line that meets the required communication quality. The line configuration unit 504 then transmits the communication line allocation instruction to the destination GW13-1 via the communication unit 501. The destination GW13-1 assigns a communication line for data transmission and reception according to the communication line assignment instructions. Once the communication line assignment is complete, the destination GW13-1 sends a notification of completion. The communication line established between the destination GW13-1 and the satellite repeater 10 corresponds to the configured communication line. The above notification of completion of allocation includes information on the frequencies that the satellite backhaul station 12 should use. The line configuration unit 504 receives notification of assignment completion via the communication unit 501.

[0047] Furthermore, the circuit setting unit 504 notifies the initial connection GW 13-3 via the communication unit 501 that the connection setup is complete. The initial connection GW 13-3 then notifies the satellite backhaul station 12 that the connection setup is complete. This connection setup completion information includes the frequency assigned by the destination GW 13-1. The satellite backhaul station 12 sets the frequency of the communication line according to this information. This enables communication between the satellite backhaul station 12 and GW13-1 via the satellite transponder 10.

[0048] Next, the processing details of the satellite transponder configuration change procedure 81 shown in Figure 9 will be explained using Figure 10.

[0049] Figure 10 shows the beam-to-beam connection of the forward link for simplicity, but similar beam-to-beam connections exist for the return link as well. However, the beam-to-beam connections of the forward link and return link may differ in terms of connection relationships and the frequency bandwidths used, and can be configured independently for each. Furthermore, the inter-beam connection shown in Figure 10 is realized by the digital channelizer function of the satellite transponder 10.

[0050] Figure 10(a) shows the state of the satellite transponder 10 before the expansion of the inter-beam connection bandwidth. The user beam in which the satellite backhaul station 12 is located is allocated beamband 90, and this beamband is divided to set the connection bandwidth with the GW. For example, the inter-beam connection bandwidth 90-1a is configured to connect with the inter-beam connection bandwidth 94-3a, which is part of the beam bandwidth 94 allocated to the feeder link of GW13-1. Inter-beam connection bandwidths 90-1a and 94-3a have the same frequency bandwidth, and a communication link is configured using part or all of this frequency bandwidth. Furthermore, the beam-to-beam connection bandwidth 90-2 is configured to connect with beam-to-beam connection bandwidth 93-1, which is allocated to another GW. Similarly, beam-to-beam connection bandwidths are configured within beam bandwidth 90 as needed to connect to each GW. Beambands 91 and 92 represent beambands allocated to other user beams.

[0051] Figure 10(b) shows the state after the beam-to-beam connection bandwidth has been expanded. Specifically, Figure 10(b) shows the state after the bandwidths of beam-to-beam connection bands 90-1a and 94-3a have been expanded. The inter-beam connection bandwidths 90-1a and 94-3a meet the packet error rate requirements for QoS information. However, due to insufficient available frequency bandwidth, the bandwidth of inter-beam connection bandwidths 90-1a and 94-3a will be expanded. The expansion of the frequency bandwidths for the inter-beam connection bands 90-1b and 94-3b resolves the shortage of available frequency bandwidth. As a result, in the destination GW determination procedure 70 shown in Figure 9, the selection unit 503 can determine GW13-1 as the destination GW.

[0052] Next, we will explain an example of a procedure for connecting to an appropriate gateway that satisfies the required communication quality for each communication line, according to the error rate of the communication line, as explained in Figure 4. In other words, we will explain the procedure for changing the destination gateway of a communication line while it is in use, using Figure 11.

[0053] In Figure 11, the satellite backhaul station 12 determines that the communication line quality is either insufficient or excessive (communication line quality insufficient / excessive 61). In this case, the satellite backhaul station 12 requests a quality change from the source GW 13-1, which is the currently connected GW. In this example, the satellite backhaul station 12 determines that the communication line connected to GW 13-1 is insufficient because it cannot meet the error rate requirements for the QoS flow that transmits email data. It is possible to determine whether the communication line quality is insufficient or excessive by measuring the communication line quality, for example, by measuring the C / N ratio. The satellite backhaul station 12 measures the forward link communication line. On the other hand, for the return link communication line, the source GW 13-1 feeds back the measurement results to the satellite backhaul station 12, enabling the satellite backhaul station 12 to make a judgment. The quality change request transmitted by the satellite backhaul station 12 includes at least QoS information indicating the requested communication quality. Upon receiving the quality change request, the connecting source GW 13-1 transmits the quality change request to the GW management device 50. In addition to QoS information, the quality change request transmitted by the connecting source GW 13-1 to the GW management device 50 includes information about the user beam for which the quality change request was made. The measurement information collection procedure 100 and the satellite repeater setting change procedure 80 shown in Figure 11 have already been explained in Figure 9, so their explanations will be omitted here.

[0054] In Figure 11, it is assumed that in the destination GW determination procedure 70, the selection unit 503 selected destination GW13-2 as the destination GW that satisfies the QoS information. Destination GW13-2 corresponds to a new selected earth station. The selection unit 503 notifies the circuit setting unit 504 that GW13-2 has been selected as the new selected earth station. Then, the line setting unit 504 transmits a communication line assignment to the destination GW13-2 via the communication unit 501, instructing it to set up (assign) a communication line that meets the required communication quality. The destination GW13-2 assigns a communication line for data transmission and reception according to the communication line assignment instructions. Once the communication line assignment is complete, the destination GW13-2 sends a notification of completion. The communication line established between the destination GW13-2 and the satellite repeater 10 corresponds to the newly configured communication line. The above notification of completion of allocation includes information on the frequencies that the satellite backhaul station 12 should use. The line configuration unit 504 receives notification of assignment completion via the communication unit 501.

[0055] Furthermore, the circuit setting unit 504 notifies the source GW13-1 of the completion of the quality change via the communication unit 501. The source GW13-1 then notifies the satellite backhaul station 12 of the completion of the quality change. This notification of completion of the quality change includes information on the frequency assigned by the destination GW13-2. By changing the frequency of the communication line, i.e., performing a handover, according to this information, the satellite backhaul station 12 and GW13-2 can communicate via the satellite repeater 10. Furthermore, in order to release the communication line that the source GW13-1 had secured, the satellite backhaul station 12 sends a notification of handover completion to the source GW13-1 via the destination GW13-2.

[0056] Next, we will explain, using Figure 12, a procedure for changing the connection destination of a communication line using a different procedure than the one described in Figure 11.

[0057] In Figure 12, the source GW13-1 determines whether the communication line quality is insufficient or excessive (communication line quality insufficient / excessive 62). This can be determined by measuring the communication line quality, such as C / N measurement. For the forward link, the satellite backhaul station 12 feeds the measurement results back to the source GW13-1, enabling the source GW13-1 to make the determination. On the other hand, for the return link, the source GW13-1 can make the determination by measuring it itself.

[0058] The procedure from the point of connection GW13-1 to the point of sending a quality change request to the GW management device 50 onward is the same as described in Figure 11, so the explanation will be omitted. Furthermore, since the source GW13-1 has already acquired the QoS information for the communication line connected to the satellite backhaul station 12 during the initial connection, it is possible to send a quality change request to the GW management device 50 similar to that shown in Figure 11.

[0059] The communication line can be changed using either of the procedures described in Figures 11 and 12, or it is possible to change the communication line using both procedures. In other words, when changing the forward link communication line, the satellite backhaul station 12 makes the decision to change it. When changing the return link communication line, the connecting GW 13-1 makes the decision to change it. By using both procedures in combination in this way, it becomes unnecessary to feed back the results of communication line quality measurements (e.g., C / N measurement) used to determine whether the communication line quality is insufficient or excessive, as explained in Figures 11 and 12.

[0060] Next, the procedure shown in Figures 9 to 12 will be explained using a flowchart. Figure 13 shows an example of the operation of the GW management device 50 in the measurement information acquisition procedure 100 shown in Figure 9, etc. Figure 14 shows an example of the operation of the GW management device 50 after receiving the connection request shown in Figure 9. Figure 15 shows an example of the operation of the GW management device 50 after receiving the quality change requests shown in Figures 11 and 12.

[0061] In Figure 13, when the communication unit 501 receives FL quality / available bandwidth information from GW13-1 or GW13-2 (YES in step S511), it stores the FL quality / available bandwidth information in the storage unit 502. The memory unit 502 stores FL quality / available bandwidth information (step S512).

[0062] In Figure 14, when the communication unit 501 receives a connection request from GW13-1 (YES in step S521), it forwards the connection request to the selection unit 503.

[0063] In step S522, the selection unit 503 determines whether or not there is insufficient inter-beam connection bandwidth to satisfy QoS. If there is sufficient inter-beam connection bandwidth to satisfy QoS (NO in step S522), the process proceeds to step S524. On the other hand, if there is insufficient inter-beam connection bandwidth to satisfy QoS (YES in step S522), the process proceeds to step S523.

[0064] In step S523, the selection unit 503 performs the procedure 80 for changing the settings of the satellite repeater 10, as shown in Figure 9. Since the details of the procedure 80 for changing the settings of the satellite repeater 10 have already been explained, the explanation is omitted here.

[0065] In step S524, the selection unit 503 determines the destination gateway. That is, the selection unit 503 performs the destination gateway determination procedure 70 shown in Figure 9.

[0066] Next, the line setting unit 504 generates the communication line allocation instruction shown in Figure 9 and transmits it to the destination GW via the communication unit 501 (step S525). Subsequently, the line setting unit 504 receives the assignment completion notification shown in Figure 9 via the communication unit 501 (step S526). Furthermore, the line setting unit 504 generates the connection setting completion notification shown in Figure 9 and transmits it to the initial connection GW via the communication unit 501 (step S527).

[0067] In Figure 15, when the communication unit 501 receives a quality change request from GW13-1 (YES in step S531), it forwards the quality change request to the selection unit 503.

[0068] Next, the selection unit 503 determines whether or not there is insufficient inter-beam connection bandwidth to satisfy QoS (step S532). If there is sufficient inter-beam connection bandwidth to satisfy QoS (NO in step S532), the process proceeds to step S534. On the other hand, if there is insufficient inter-beam connection bandwidth to satisfy QoS (YES in step S532), the process proceeds to step S533.

[0069] In step S533, the selection unit 503 performs the procedure 80 for changing the settings of the satellite repeater 10, as shown in Figure 11 or Figure 12. Since the details of the procedure 80 for changing the settings of the satellite repeater 10 have already been explained, the explanation is omitted here.

[0070] In step S534, the selection unit 503 determines a new destination gateway (GW). That is, the selection unit 503 performs the destination gateway determination procedure 70 shown in Figure 11 or Figure 12. The procedure for determining the destination gateway (GW) (70) is explained in Figures 11 and 12. Therefore, a detailed explanation is omitted here.

[0071] Next, the line setting unit 504 generates a communication line allocation instruction as shown in Figure 11 or Figure 12 and transmits it to the new destination GW via the communication unit 501 (step S535). Subsequently, the line setting unit 504 receives the assignment completion notification shown in Figure 11 or Figure 12 via the communication unit 501 (step S536). Furthermore, the line configuration unit 504 generates a quality change completion notification as shown in Figure 11 or Figure 12 and transmits it to the connecting GW via the communication unit 501 (step S537).

[0072] In this embodiment, as described in Figures 6 to 15, a GW management device 50 is installed to centrally manage feeder link quality information and available bandwidth information. This makes it possible to select the optimal GW as the destination GW for the communication line in the satellite communication connectivity system according to this embodiment, and to distribute the load without significant bias in the utilization of frequency resources held by each GW.

[0073] The above explanation assumed that quality measurements (e.g., C / N measurements) of the feeder links between each GW and the satellite transponder 10 were performed, and used this as a criterion for deciding which GW to select as the destination for the communication line. Here, we will explain the method for performing feeder link quality measurements for each GW and the satellite transponder 10 using Figures 16 and 17. In the following explanation, the link from an earth station such as a gateway to the satellite transponder 10 will generally be referred to as the uplink. The link from the satellite transponder 10 to the earth station will be referred to as the downlink. It is common for the uplink and downlink of a feeder link to use different frequencies.

[0074] Figure 16 shows an example in which four GW13-1 to 13-4 exist within the satellite communication connectivity system according to this embodiment.

[0075] One of the gateways (GWs), for example GW13-1, transmits the quality measurement signal 110 uplink at a certain power level. The satellite repeater 10 also copies the quality measurement signal 110 to all gateways and transmits it downlink using its digital channelizer function. GW13-1 receives quality measurement signal 110-1. GW13-2 receives quality measurement signal 110-2. GW13-3 receives quality measurement signal 110-3. GW13-2 receives quality measurement signal 110-4. Similarly, each GW transmits a quality measurement signal. For example, GW13-4 transmits the quality measurement signal 111 uplink at a certain power level. The satellite repeater 10 copies the quality measurement signal 111 to all GWs and transmits it downlink using the digital channelizer function. GW13-1 receives quality measurement signal 111-1. GW13-2 receives quality measurement signal 111-2. GW13-3 receives quality measurement signal 111-3. GW13-4 receives quality measurement signal 111-4. The transmission and reception of quality measurement signals may be performed simultaneously by each GW using frequency division, or sequentially using time division. In the case of time division, the inter-beam connection bandwidth setting is changed in time division as a digital channelizer setting of the satellite repeater 10, as shown in Figure 10. By doing so, it is possible to minimize the frequency bandwidth used for transmitting and receiving quality measurement signals. Furthermore, each GW performs quality measurement, such as C / N measurement, based on the quality measurement signal it receives, and transmits the C / N measurement results to the GW management device 50. In this way, the GW management device 50 evaluates the quality measurement results.

[0076] Figure 17 shows an example of a method for evaluating quality measurement results in the GW control device 50.

[0077] In Figure 17, the quality matrix 120 shows the quality measurement results measured by each GW in response to the quality measurement signals transmitted by each GW. For example, GW1 corresponds to GW13-1, GW2 to GW13-2, GW3 to GW13-3, and GW4 to GW13-4. Furthermore, for example, let A1 be the C / N value measured by GW1 in response to the quality measurement signal transmitted by GW1. Let A2 be the value measured by GW2. Let A3 be the value measured by GW3. Let A4 be the value measured by GW4. The set of measurement values ​​along the horizontal axis of this quality matrix 120, for example, the set of measurement values ​​A1, A2, A3, and A4, 121-1, can be used to calculate the difference in downlink quality for each feeder link because the uplink signals are identical. Similarly, the difference in downlink quality for each feeder link can be calculated from measurement sets 121-2, 121-3, and 121-4. By averaging the quality differences using multiple measurement sets, the accuracy of the measurement results can be improved. Furthermore, the measurement set 122-1 of measurement values ​​A1, B1, C1, and D1 in the vertical axis direction of the quality matrix 120 can be considered to represent the same quality for the downlinks. Therefore, the difference in uplink quality for each feeder link can be calculated. Similarly, the difference in uplink quality for each feeder link can also be calculated from measurement sets 122-2, 122-3, and 122-4. By averaging the quality differences using multiple measurement sets, the accuracy of the measurement results can be improved.

[0078] The feeder link quality differences evaluated in Figure 17 are used to determine how much the communication line quality needs to improve to meet the error rate requirements for QoS, or how much the error rate can be reduced to meet the QoS requirements. The change in the error rate in relation to the feeder link quality differences can be determined using pre-measured results.

[0079] Another method for measuring feeder link quality is to equip the satellite transceiver 10 with a function to generate and transmit quality measurement signals, thereby enabling downlink quality measurement. Furthermore, by equipping the satellite transceiver 10 with a quality measurement function for received quality measurement signals, uplink quality measurement is also possible. However, the method described in Figures 16 and 17 has the advantage of eliminating the need for the satellite transponder to have quality measurement signal generation / transmission functions or quality measurement functions.

[0080] ***Explanation of the effects of the embodiment*** In this embodiment, an earth station that meets the required communication quality is selected from among multiple earth stations located in different locations, and a communication line that meets the required communication quality is established between the selected earth station and the communication satellite. Therefore, according to this embodiment, even if the communication environment differs depending on the location of the earth station due to weather conditions, etc., it is possible to select an earth station that is in a communication environment that meets the required communication quality for the communication line with the communication satellite. As a result, according to this embodiment, an appropriate communication line can be established according to the required communication quality. In other words, in this embodiment, by assigning different frequency band communication lines to QoS flows that require different error rates and delays as satellite backhaul lines, it becomes possible to switch the connection destination for each communication line. Therefore, according to this embodiment, in response to changes in the wireless environment due to rainfall, etc., it becomes possible to appropriately select the earth station to which the communication line is connected and set up an appropriate communication line in order to meet the error rate and delay requirements of the QoS flow.

[0081] Note that the procedure described in this embodiment is just one example. Therefore, it is acceptable to perform only a portion of the procedure described in this embodiment. Furthermore, at least some of the procedures described in this embodiment may be combined with procedures not described in this embodiment. Furthermore, the configuration and procedures described in this embodiment may be modified as necessary.

[0082] ***Supplementary explanation of hardware configuration*** Here, we will provide a supplementary explanation of the hardware configuration of the GW management device 50. The processor 901 shown in Figure 7 is an integrated circuit (IC) that performs processing. Processor 901 includes components such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor). The main memory 902 shown in Figure 7 is RAM (Random Access Memory). The auxiliary storage device 903 shown in Figure 7 includes ROM (Read Only Memory), flash memory, HDD (Hard Disk Drive), etc. The communication device 904 shown in Figure 7 is an electronic circuit that performs data communication processing. The communication device 904 is, for example, a communication chip or a NIC (Network Interface Card).

[0083] Furthermore, the auxiliary storage device 903 also stores the OS (Operating System). Then, at least a portion of the OS is executed by processor 901. The processor 901 executes programs that implement the functions of the communication unit 501, the selection unit 503, and the line setting unit 504 while executing at least a part of the OS. Processor 901 executes the OS, handling task management, memory management, file management, communication control, and other functions. Furthermore, at least one of the information, data, signal values, and variable values ​​indicating the processing results of the communication unit 501, selection unit 503, and line setting unit 504 is stored in at least one of the main memory 902, auxiliary memory 903, registers in the processor 901, and cache memory. Furthermore, the programs that implement the functions of the communication unit 501, the selection unit 503, and the line setting unit 504 may be stored on a portable recording medium such as a magnetic disk, flexible disk, optical disk, compact disk, Blu-ray® disc, or DVD. A portable recording medium containing the programs that implement the functions of the communication unit 501, the selection unit 503, and the line setting unit 504 may also be distributed.

[0084] Furthermore, at least one of the "parts" in the communication unit 501, selection unit 503, and line setting unit 504 may be read as "circuit," "process," "procedure," "processing," or "circuitry." Furthermore, the GW management device 50 may be implemented by a processing circuit. Examples of processing circuits include logic ICs (Integrated Circuits), GAs (Gate Arrays), ASICs (Application Specific Integrated Circuits), and FPGAs (Field-Programmable Gate Arrays). In this case, the communication unit 501, the selection unit 503, and the line setting unit 504 are each implemented as part of a processing circuit. In this specification, the higher-level concept encompassing both the processor and the processing circuit is referred to as "processing circuitry." In other words, a processor and a processing circuit are specific examples of "processing circuits," respectively.

[0085] The various aspects of this disclosure are summarized below as an appendix. (Note 1) For each required communication quality, a selection unit selects an earth station from among multiple earth stations, each located in a different place, that will have a communication link with the communication satellite that meets the required communication quality. A communication control device having a line setting unit that sets a communication line that satisfies the required communication quality for each required communication quality between the communication satellite and the selected earth station as a set communication line. (Note 2) The aforementioned selection unit is A communication control device according to Appendix 1, which selects a different earth station as the selected earth station for each required communication quality. (Note 3) The aforementioned selection unit is If the configured communication line fails to meet the corresponding required communication quality, then from among the multiple earth stations, an earth station other than the selected earth station whose communication line to the communication satellite meets the corresponding required communication quality is selected as a new selected earth station. The aforementioned line setting unit is, A communication control device according to Appendix 1 or Appendix 2, which, in relation to the aforementioned requested communication quality, sets up a new set communication line between the communication satellite and the newly selected earth station that satisfies the aforementioned requested communication quality, instead of the set communication line. (Note 4) The aforementioned selection unit is The communication control device according to Appendix 3, which, when the configured communication line fails to meet the required communication quality due to the communication environment of the selected earth station, selects from among the multiple earth stations an earth station with a different communication environment from the selected earth station as the new selected earth station. (Note 5) The aforementioned line setting unit is, A communication control device according to any one of the appendices 1 to 4, which sets the configured communication line as the communication line for multiple communication flows to which the same requested communication quality is applied for each requested communication quality. (Note 6) The aforementioned line setting unit is, A communication control device as described in Appendix 3, which sets the new configured communication line as the communication line for multiple communication flows to which the aforementioned corresponding required communication quality is applied. (Note 7) The aforementioned selection unit is A communication control device according to any one of the appendices 1 to 6, which selects the selected earth station based on the frequency band available for each earth station to communicate with the communication satellite. (Note 8) The aforementioned selection unit is A communication control device according to any one of the appendices 1 to 7, which expands the frequency band available to the selected earth station when the selected earth station has insufficient frequency band available for the communication link with the communication satellite. (Note 9) The computer selects, from among multiple earth stations located in different locations, the earth station whose communication link to the communication satellite meets the required communication quality for each required communication quality. A communication control method in which the computer sets a communication line that satisfies the required communication quality for each required communication quality as a set communication line between the communication satellite and the selected earth station. (Note 10) For each required communication quality, a selection process is performed to select an earth station from among multiple earth stations, each located in a different place, that has a communication link with the communication satellite that meets the required communication quality. A communication control program that causes a computer to perform a line setting process to set up a communication line that satisfies the required communication quality for each requested communication quality between the communication satellite and the selected earth station. [Explanation of Symbols]

[0086] 1-1 User terminal, 1-2 User terminal, 1-3 User terminal, 1-4 User terminal, 2-1 Base station, 2-2 Base station, 3-1 Cell, 3-2 Cell, 4 Core network, 5 Internet, 6-1 Server, 6-2 Server, 10 Satellite repeater, 11-1 Beam area, 11-2 Beam area, 11-3 Beam area, 11-4 Beam area, 12 Satellite backhaul station, 13-1 GW, 13-2 GW, 13-3 GW, 14 Satellite communication control station, 20-1 Voice communication QoS flow, 20-2 Voice communication QoS flow, 21-1 Email QoS flow, 21-2 Email QoS flow, 22 Communication line, 23-1 Communication line, 23-2 Communication line, 23-3 Communication line, 30 SDAP function, 31 IP function, 32 QFI-DSCP conversion function, 33-1 IP packet, 33-2 IP packet, 40 IP function, 41 QoS isolation function, 42-1 modem function, 42-2 modem function, 43 antenna, 50 GW management device, 501 communication unit, 502 memory unit, 503 selection unit, 504 line setting unit, 901 processor, 902 main memory, 903 auxiliary memory, 904 communication device.

Claims

1. When the communication environment of any of a plurality of earth stations, each located in a different place, changes, a selection unit selects an earth station as the selected earth station for each required communication quality, which is the required communication quality, and after the communication environment of any of the earth stations changes, the communication line with the communication satellite satisfies the required communication quality. A communication control device having a line setting unit that, for each requested communication quality, sets a communication line that satisfies the requested communication quality after the communication environment of any of the earth stations changes, as a set communication line between the communication satellite and the selected earth station.

2. The aforementioned selection unit is The communication control device according to claim 1, wherein a different earth station is selected as the selected earth station for each required communication quality.

3. The aforementioned selection unit is If the configured communication line fails to meet the corresponding required communication quality, then from among the multiple earth stations, an earth station other than the selected earth station whose communication line to the communication satellite meets the corresponding required communication quality is selected as a new selected earth station. The aforementioned line setting unit is, The communication control device according to claim 1, wherein, in relation to the requested communication quality, a communication line that satisfies the requested communication quality is set as a new set communication line between the communication satellite and the newly selected earth station, instead of the set communication line.

4. The aforementioned selection unit is The communication control device according to claim 3, wherein, if the configured communication line fails to meet the corresponding required communication quality due to the communication environment of the selected earth station, a new selected earth station is selected from among the plurality of earth stations, which has a different communication environment from the selected earth station.

5. The aforementioned line setting unit is, The communication control device according to claim 1, wherein the configured communication line is configured as a communication line for multiple communication flows to which the same requested communication quality is applied for each requested communication quality.

6. The aforementioned line setting unit is, The communication control device according to claim 3, wherein the new configured communication line is set as the communication line for a plurality of communication flows to which the aforementioned corresponding required communication quality is applied.

7. The aforementioned selection unit is The communication control device according to claim 1, which selects the selected earth station based on the frequency band available for each earth station to use for the communication link with the communication satellite.

8. The aforementioned selection unit is The communication control device according to claim 1, which expands the frequency band available to the selected earth station when the selected earth station has insufficient frequency band available for the communication link between the selected earth station and the communication satellite.

9. When the communication environment of any of the multiple earth stations, each located in a different place, changes, the computer selects, for each required communication quality, the earth station whose communication line with the communication satellite after the change in the communication environment of the aforementioned earth station satisfies the required communication quality as the selected earth station. A communication control method in which the computer sets a communication line that satisfies the required communication quality after the communication environment of any of the earth stations changes, as a set communication line between the communication satellite and the selected earth station, for each required communication quality.

10. When the communication environment of any of the multiple earth stations, each located at a different location, changes, a selection process is performed to select an earth station from among the multiple earth stations, each located at a different location, whose communication link to the communication satellite satisfies the required communication quality, for each required communication quality. A communication control program that causes a computer to perform a line setting process for each requested communication quality, which involves setting a communication line that satisfies the requested communication quality after the communication environment of any of the earth stations changes, between the communication satellite and the selected earth station.

11. A selection unit that, for each required communication quality, selects an earth station from among a plurality of earth stations, each located in a different place, that has a communication link with a communication satellite that satisfies the required communication quality, The system includes a line setting unit that sets a communication line that satisfies the required communication quality for each requested communication quality between the communication satellite and the selected earth station as a set communication line, The aforementioned selection unit is If the configured communication line fails to meet the corresponding required communication quality, then from among the multiple earth stations, an earth station other than the selected earth station whose communication line to the communication satellite meets the corresponding required communication quality is selected as a new selected earth station. The aforementioned line setting unit is, A communication control device that, in response to the aforementioned requested communication quality, sets up a new set communication line between the communication satellite and the newly selected earth station that satisfies the aforementioned requested communication quality, instead of the previously set communication line.

12. The selection unit is The communication control device according to claim 11, wherein, if the configured communication line fails to meet the corresponding required communication quality due to the communication environment of the selected earth station, a new selected earth station is selected from among the plurality of earth stations, which has a different communication environment from the selected earth station.

13. The line setting unit is, The communication control device according to claim 11, wherein the new configured communication line is set as the communication line for a plurality of communication flows to which the aforementioned corresponding required communication quality is applied.

Images