JP2008300908A - Satellite communication system, communication control station, integrated gateway device, and priority control method for use therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satellite communication system which can shorten the time required for assigning a line to a communication request of high priority. <P>SOLUTION: A communication control station 1 monitors congestion of every satellite line 201-203 by monitoring the traffic of every satellite line 201-203, and controls integrated GW devices 2-1 to 2-3 in order to perform priority control and band control of every satellite line 201-203 based on the monitor results. When the traffic of the satellite line 201-203 exceeds a preset threshold, the communication control station 1 notifies limit state information to the integrated GW devices 2-1 to 2-3 in order to limit communication of low priority. Upon receiving the limit state information, the integrated GW devices 2-1 to 2-3 receive communication of preset priority anew depending on the limit state and performs priority control such as interruption of communication of that priority and band control. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a satellite communication system, a communication control station, an integrated gateway device, and a priority control method used for them, and more particularly to a satellite communication system using a plurality of satellite channels.

  2. Description of the Related Art Conventionally, in a satellite communication system using a communication satellite, a line connection (for example, Patent Document 1, Japanese Patent Application Laid-Open No. 2003-26083) that assigns an empty line every time a call request is made is used. 2) or line connection by a PAMA (Pre-Assignment Multiple Access) system in which a specific line is always fixedly allocated to a specific station.

  The above-mentioned line connection by the PAMA method does not need to issue a call request each time, so it can be constructed with a simple mechanism. However, since a line must always be allocated to a station with a small amount of communication, a satellite line Cannot be used efficiently. On the other hand, in the line connection by the DAMA method, a free line is allocated every time a call request is made, so that a satellite line with limited resources can be used efficiently.

JP 2000-151490 A JP 2000-307498 A Japanese Patent Laid-Open No. 11-027316 JP 2001-308925 A JP2003-077854A JP 2005-277835 A

  However, in the conventional DAMA system line connection described above, if all the lines are blocked by a call request on a satellite line, subsequent call requests are rejected, and therefore priority control over the call request is desired. ing.

  In this case, in the case of line connection using the DAMA method, even if priority control is simply performed according to whether the priority of the call request is high or low, all lines are occupied when a call request with a high priority is received. Since a line used for a low-priority call request is released and a line is assigned to a high-priority call request, there is a problem that it takes time to assign the line.

  The above priority control is disclosed in Patent Documents 3 to 6 and the like.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to use a satellite communication system, a communication control station, an integrated gateway apparatus, and the like that can shorten the time until a line is allocated to a high priority call request. It is to provide a priority control method.

  A satellite communication system according to the present invention includes an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels, and a communication control station that performs channel allocation control and control of the integrated gateway device at least for each satellite channel The communication control station includes: a line control unit that monitors a communication status of each satellite line; and a communication having a lower priority based on a monitoring result of the monitoring unit. Communication control means for notifying the integrated gateway device of restriction information for limiting before the congestion state of the network is detected, the integrated gateway device based on the restriction information from the communication control station. Means for performing priority control and bandwidth control for limiting lower-order communication are provided.

  A communication control station according to the present invention is a communication control station that at least performs control of an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels and channel allocation control for each satellite channel, Line control means for monitoring the communication status for each satellite line, and restriction information for restricting lower priority communication based on the monitoring result of the monitoring means before the congestion state of the satellite line is detected Communication control means for notifying the integrated gateway device, and the integrated gateway device performs priority control and bandwidth control for restricting lower priority communication based on the restriction information from the communication control means. Yes.

  An integrated gateway device according to the present invention is an integrated gateway device that performs satellite communication between terminals using a plurality of satellite channels based on at least control of a communication control station that performs channel allocation control for each satellite channel. When the restriction information is sent from the control station for restricting lower-priority communication based on the monitoring result of the communication status for each satellite line before the congestion state of the satellite line is detected, the restriction is sent. Means for performing priority control and bandwidth control for restricting lower priority communication based on the information is provided.

  The priority control method according to the present invention includes an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels, and a communication control station that performs channel allocation control and control of the integrated gateway device at least for each satellite channel A priority control method used in a satellite communication system including: a process in which the communication control station monitors a communication status for each satellite line; and a communication having a lower priority based on the monitoring result And processing for notifying the integrated gateway device of restriction information for restriction before the congestion state is detected, and the integrated gateway device performs the priority based on the restriction information from the communication control station. Performs processing for performing priority control and bandwidth control for restricting lower-layer communication.

  That is, in the satellite communication system of the present invention, when the traffic of each satellite line exceeds a preset threshold value, the restriction status information is restricted from the communication control station to the integrated GW device in order to restrict the lower priority communication. Each satellite channel performs priority control such as suppression of new acceptance of communication with a priority set in advance based on this restriction state information, priority control such as disconnection / connection of the priority communication, and bandwidth control. This is performed before the congestion state is detected.

  Therefore, in the satellite communication system of the present invention, even when there is a high priority call request, it is possible to assign a line to a high priority call request without disconnecting the lower priority call. Therefore, it is not necessary to wait for the time until the cutting process is completed, and it is possible to reduce the time for the allocation process.

  According to the present invention, by adopting the configuration and operation as described above, it is possible to reduce the time required to allocate a line to a high priority call request.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a satellite communication system according to an embodiment of the present invention. 1, the satellite communication system according to the present embodiment includes a communication control station 1, integrated GW (Gateway) devices 2-1 to 2-3, and a satellite GW [X-CDMA (Code Division Multiple Access). Connection)] 3-1-3-3 and satellite GW [X-FDMA (Frequency Division Multiple Access)] 4-1-4-3 and satellite GW (Ku) 5-1-5. 3 is included. Here, the integrated GW apparatus 2-1 is connected to the terminals 6-1 to 6-3 via the network 101, and the integrated GW apparatus 2-2 is connected to the terminals 6-4 to 6-6 via the network 102. The case where the integrated GW apparatus 2-3 is connected to the terminals 6-7 to 6-9 via the network 103 is shown. In addition, the satellite GW (X-CDMA) 3-1 to 3-3 are connected by the satellite line 201, and the satellite GW (X-FDMA) 4-1 to 4-3 are connected by the satellite line 202. Satellites GW (Ku) 5-1 to 5-3 are connected by a satellite line 203.

  The satellite line 201 is a line corresponding to an X-band (8 to 12 GHz frequency band) CDMA communication satellite (not shown), and the satellite line 202 is an X-band FDMA communication satellite (not shown). It is a line. The satellite line 203 is a line corresponding to a communication satellite (not shown) in the Ku band (frequency band of 12 to 18 GHz). It should be noted that the embodiment of the present invention can be applied to other than the above-described satellite line.

  Satellites GW (X-CDMA) 3-1 to 3-3 are gateway devices for performing communication using the satellite line 201. Satellites GW (X-FDMA) 4-1 to 4-3 are gateway devices for performing communication using the satellite line 202. Satellites GW (Ku) 5-1 to 5-3 are gateway devices for performing communication using the satellite line 203.

  The terminals 6-1 to 6-9 have an IP communication function that enables IP communication such as an IP (Internet Protocol) telephone through the networks 101 to 103. The integrated GW apparatuses 2-1 to 2-3 convert the IP communication from the terminals 6-1 to 6-9 through the networks 101 to 103 into the communication through the satellite lines 201 to 203, thereby converting the satellite GW (X-CDMA). 3-1 to 3-3, satellite GW (X-FDMA) 4-1 to 4-3, satellite GW (Ku) 5-1 to 5-3, and control from the communication control station 1 Based on this, a function of performing priority control and bandwidth control for each of the satellite lines 201 to 203 is provided.

  The communication control station 1 monitors the traffic for each satellite line 201 to 203 to monitor the congestion state for each satellite line 201 to 203, and prioritizes each satellite line 201 to 203 in advance based on the monitoring result. A function of controlling the integrated GW apparatuses 2-1 to 2-3 in order to perform control and bandwidth control is provided.

  In the present embodiment, when the traffic of the satellite lines 201 to 203 exceeds a preset threshold value, the communication control station 1 to the integrated GW apparatuses 2-1 to 2-3 to limit lower priority communication. Is notified of restriction status information (restriction information). When the integrated GW apparatuses 2-1 to 2-3 receive the restriction state information, priority control and bandwidth control such as new acceptance of communication with priority set in advance according to the restriction state, disconnection of communication with the priority, etc. I do.

  As described above, in the present embodiment, by performing priority control and bandwidth control for each of the satellite lines 201 to 203 based on the restriction state according to the traffic of the satellite lines 201 to 203, it is possible to respond to a call request with a high priority. It is possible to shorten the time until line allocation. In other words, even when there is a call request with a high priority, it is possible to assign a line to a call request with a high priority without necessarily disconnecting a call with a lower priority, so the time until the disconnection process is completed. It is no longer necessary to wait until the allocation process time is shortened.

  FIG. 2 is a diagram illustrating the operation of the satellite communication system according to the embodiment of the present invention. Since the satellite communication system according to the present embodiment has the same configuration as the satellite communication system shown in FIG. 1, the operation of the satellite communication system will be described with reference to FIGS. 2, the integrated GW apparatuses 2-1 to 2-3, the satellite GW (X-CDMA) 3-1 to 3-3, the satellite GW (X-FDMA) 4-1 to 4-3 in FIG. Satellites GW (Ku) 5-1 to 5-3 and terminals 6-1 to 6-9 are indicated by reference numbers 2, 3, 4, 5 and 6, respectively, and the communication control station 1 is not shown. Yes.

  When a new packet is transmitted from the terminal 6 [see (1) in FIG. 2], the integrated GW apparatus 2 temporarily holds the packet from the terminal 6 in the packet holding unit 21 [see (2) in FIG. The packet is transmitted to the set default route [satellite GW (X-CDMA) 3 in this embodiment] [see (3) in FIG. 2].

  At this time, if the satellite line 201 corresponding to the X-band CDMA communication satellite is congested, the satellite GW (X-CDMA) 3 sends a connection failure notification and a next route instruction to the integrated GW apparatus 2. [See (4) in FIG. 2]. In this case, the integrated GW apparatus 2 transmits the packet temporarily held in the packet holding unit 21 to the “instructed” next route [satellite GW (Ku) 5 in this embodiment] [see (5) in FIG. 2]. ]. When the satellite GW (Ku) 5 succeeds in assigning the line in the satellite line 203 corresponding to the Ku band communication satellite, the satellite GW (Ku) 5 sends a connection notification to the integrated GW apparatus 2 (see (6) in FIG. 2).

  FIG. 3 is a block diagram showing a configuration example of the communication control station according to the embodiment of the present invention. In FIG. 3, communication control using the satellite line 201 corresponding to the X-band CDMA communication satellite is illustrated, but the satellite line 202 corresponding to the X-band FDMA communication satellite and the Ku-band communication satellite are supported. The same processing as in the case of communication using the satellite line 201 is performed for the satellite line 203 to be performed.

  In FIG. 3, the satellite GW (X-CDMA) 3-1 and 3-2 are not shown, and the space between the satellite GW (X-CDMA) 3-1 and 3-2 and the satellite line 201 is omitted. Satellite communication equipment (modems, etc.) 8-1, 8-2 to be provided, integrated GW devices 2-1 and 2-2, and satellites provided between the satellite communication equipment 8-1 and 8-2 and the communication control station 1 The communication control devices 7-1 and 7-2 are illustrated.

  The communication control station 1 includes a communication control unit 11 that transmits band limitation information to the satellite communication control devices 7-1 and 7-2 in order to cause the integrated GW devices 2-1 and 2-2 to perform priority control, and satellite communication. A line control unit 12 for transmitting line assignment information to the satellite communication control devices 7-1 and 7-2 in order to cause the equipments 8-1 and 8-2 to perform line assignment to the satellite line 201. . Although not shown, the communication control station 1 includes not only the line control unit 12 corresponding to the satellite line 201 but also the line control units corresponding to the satellite lines 202 and 203, respectively. The band limitation information and the line allocation information may be collectively referred to as the above-described limitation state information.

  The line control unit 12 monitors the traffic of the satellite line 201 through the satellite communication control devices 7-1 and 7-2 and the satellite communication devices 8-1 and 8-2, and notifies the communication control unit 11 of the monitoring result as a satellite resource. To do. Based on the satellite resource notified from the line control unit 12, the communication control unit 11 determines whether to perform priority control or band control in order to control the band of the satellite line 201 in advance, and uses the determination result as the band limit information. To the integrated GW devices 2-1 and 2-2 through the satellite communication control devices 7-1 and 7-2.

  The integrated GW apparatuses 2-1 and 2-2 perform priority control and band control in order to limit lower priority communication based on the band limitation information from the communication control unit 11. In this case, for example, when the traffic on the satellite line 201 increases and exceeds the preset first threshold, the integrated GW devices 2-1 and 2-2 have a new lowest priority call request. Also deter the acceptance. When the traffic on the satellite line 201 further increases and exceeds the next second threshold, the integrated GW devices 2-1 and 2-2 disconnect the call with the lowest priority currently connected and When a call request with a priority of is newly generated, the call request is accepted.

  Thus, in this embodiment, when there is a call request with a high priority, it is possible to assign a line to a call request with a high priority without necessarily disconnecting a call with a lower priority. It is not necessary to wait for the time until the end, and the time for the assignment process can be shortened.

  FIG. 4 is a diagram showing an example of setting a priority for accepting a call request according to the embodiment of the present invention. FIG. 4A shows an example of setting priority in “connection”. The case of “a1” is “always secure the line”, the case of “a2” is “first priority processing (processing for assigning a line first when there are multiple call requests)”, and the case of “a3” “Allowed due to availability”. In this case, the priority becomes higher in the order of “a3” → “a2” → “a1”.

  FIG. 4B shows a setting example of the priority (“processing related to forced disconnection”) in “band assignment after connection”. The case of “b1” is “never forcibly disconnected”, the case of “b2” is “allows manual forced disconnection (allows manual forced disconnection by the operator)”, and the case of “b3” “Permit automatic forced disconnection”. In this case, the priority increases in the order of “b3” → “b2” → “b1”.

  FIG. 4C shows a setting example of the priority (“processing when there is a free bandwidth”) in “band assignment after connection”. The case of “c1” is “permits bandwidth expansion and then guarantees bandwidth”, and the case of “c2” is “permits bandwidth expansion and then manually reduces the bandwidth when congestion occurs”. The case of “c3” is “permits band expansion and then automatically reduces the band when congestion occurs”, and the case of “c4” is “not allow band expansion”. In this case, the priority increases in the order of “c4” → “c3” → “c2” → “c1”.

  FIG. 5 is a diagram showing a list of problems that can occur in the control of satellite communication according to an embodiment of the present invention and countermeasures thereof. In FIG. 5, first, in the case of the number “1”, “control time when acquiring a free band by forced disconnection of the satellite line” becomes a problem. In this case, it is possible to shorten the control time by taking the measure of “reducing the priority control activation with the forced disconnection of the satellite line as much as possible”.

  Next, in the case of the number “2”, “BoD (Bandwidth on Demand) band increase limit due to insufficient satellite channel resources” becomes a problem. In this case, by taking the measure of “controlling the integrated GW devices 2, 2-1 to 2-3 so that the shaper value does not increase when the satellite channel resource is insufficient”, the bandwidth increase limit is not set. It becomes possible.

  Further, in the case of the number “3”, “control time for obtaining a free band by reducing the band by BoD” becomes a problem. In this case, the control time can be shortened by taking the measure of “reducing the priority control with the BoD of the satellite line as much as possible”.

  FIG. 6 is a diagram showing state transition of each unit in the communication control station 1 of FIG. 7 and 8 are flowcharts showing the operation of the communication control station 1 in FIG. 3, and FIG. 9 is a flowchart showing the operation of the integrated GW apparatus 2 in FIG. The operation of the satellite communication system according to the embodiment of the present invention will be described with reference to FIGS. In FIG. 6, as described in FIG. 3, the communication control station 1 adds the line control unit 12-2 corresponding to the satellite lines 202 and 203 in addition to the line control unit 12-1 corresponding to the satellite line 201. , 12-3. Moreover, it has shown about the case where n integrated GW apparatuses are provided with 2-1 to 2-n.

  Since the communication control unit 11 of the communication control station 1 is successively notified of the use status of the satellite channel resources from the channel control units 12-1 to 12-3 [see (1) in FIG. 6], the communication control unit 11 The availability of the satellite channel resource is checked to determine whether or not the bandwidth limit state has been changed [see (2) in FIG. 6].

  When there is a change in the bandwidth limit state, the communication control unit 11 uses an X-CDMA downlink CSC (Common Signaling Channel) line of the satellite line 201 via a child DAMA (Demand Assignment Multiple Access). The change of the band limitation state is notified to each integrated GW apparatus 2-1 to 2-n [see (3) in FIG. 6]. For the ground integrated GW apparatus and the integrated GW apparatus outside the X-band coverage, the change of the band limit state is notified by other methods such as a data line.

Hereinafter, determination of whether or not the bandwidth limitation state has been changed by the communication control unit 11 and notification of the change of the bandwidth limitation state to each integrated GW apparatus 2-1 to 2-n will be described. In the following description, the satellite resource occupancy is R _1IN , R _2IN , R _3IN , R _1OUT , R _2OUT , R _3OUT , and the duration is T _1IN , T _2IN , T _3IN , T _1OUT , T _2OUT , _T3OUT, and these values are values that can be changed according to the system setting information.

If the satellite resource in use is equal to or less than R _1IN %, the communication control unit 11 notifies the integrated GW devices 2-1 to 2-n of the normal state (step S1 in FIG. 7). When each of the integrated GW devices 2-1 to 2-n is notified of the normal state (step S21 in FIG. 9), the integrated GW devices 2-1 to 2-n connect each time there is a line / session connection request (step S22 in FIG. 9).

When the communication control unit 11 notifies the normal state, when the state in which the satellite resource being used becomes R _1IN % or more continues for T _1IN seconds or longer (step S2 in FIG. 7), each integrated GW device 2-1 2-n is notified of band limitation # 1 (step S3 in FIG. 7). When each integrated GW device 2-1 to 2-n receives the notification of bandwidth limitation # 1 (step S23 in FIG. 9), even if there is a free bandwidth, the bandwidth of the priority c3 session should be secured beyond the minimum guaranteed bandwidth. The new session with the priority level a3 is not connected (step S24 in FIG. 9).

When the communication control unit 11 notifies the bandwidth limitation # 1, if the state in which the used satellite resource becomes R _2IN % continues for T _2IN seconds or longer (step S4 in FIG. 7), each integrated GW device 2-1 2-n is notified of band limitation # 2 (step S5 in FIG. 7). When each integrated GW apparatus 2-1 to 2-n receives the notification of the band limitation # 2 (step S25 in FIG. 9), even if there is a vacant band, the satellite resource becomes R _2OUT % or less for the priority c3 session. And the session with the priority a3 is not connected (step S26 in FIG. 9).

When the communication control unit 11 notifies the bandwidth limitation # 2 and the state in which the satellite resource is exhausted continues for _T3IN seconds or longer (step S6 in FIG. 7), connection limitation is made to each integrated GW apparatus 2-1 to 2-n. The state is notified (step S7 in FIG. 7). Since each of the integrated GW devices 2-1 to 2-n is in a state where the available bandwidth is completely insufficient, priority control is performed by forcibly disconnecting / connecting the line and session (step S28 in FIG. 9). In this case, the priority connection target is the priority a1, and the disconnection target is the priority a3.

When the communication control unit 11 notifies the connection restriction state, if the state in which the satellite resource being used becomes R _3OUT % or less continues for T _3OUT seconds or longer (step S8 in FIG. 8), each integrated GW apparatus 2-1 ~ 2-n is notified of band limitation # 2 (step S9 in FIG. 8). When each integrated GW apparatus 2-1 to 2-n receives the notification of the band limitation # 2 (step S25 in FIG. 9), even if there is a vacant band, the satellite resource becomes R _2OUT % or less for the priority c3 session. The session of priority a3 is not connected (step S26 in FIG. 9).

When the communication control unit 11 notifies the bandwidth limitation # 2, if the state in which the used satellite resource becomes R _2OUT % or less continues for T _2OUT seconds or more (step S10 in FIG. 8), each integrated GW apparatus 2- 1 to 2-n is notified of band limitation # 1 (step S11 in FIG. 8). When each integrated GW device 2-1 to 2-n receives the notification of bandwidth limitation # 1 (step S23 in FIG. 9), even if there is a free bandwidth, the bandwidth of the priority c3 session should be secured beyond the minimum guaranteed bandwidth. The new session with the priority level a3 is not connected (step S24 in FIG. 9).

When the communication control unit 11 notifies the bandwidth limitation # 1, if the state in which the satellite resource being used becomes R _1OUT % or less continues for T _1OUT seconds or longer (step S12 in FIG. 8), each integrated GW apparatus 2- The normal state is notified to 1-2-n (step S 13 in FIG. 8). When each of the integrated GW devices 2-1 to 2-n receives the notification of the normal state (step S21 in FIG. 9), the integrated GW devices 2-1 to 2-n connect each time there is a line / session connection request (step S22 in FIG. 9).

  FIG. 10 is a table for priority control and bandwidth control used in the integrated GW apparatuses 2-1 to 2-n shown in FIG. The storage devices (not shown) of the integrated GW devices 2-1 to 2-n store a priority control and bandwidth control table as shown in FIG. 10, and communication from a terminal (not shown). Referring to the table for the request, priority control and bandwidth control are performed.

  In FIG. 10, the terminal identified by the IP address “135.10.19.1” and the port number “p1” is assigned “a1” as the priority in “connection” and the priority in “band allocation after connection”. “B1” is set as the degree (process related to forced disconnection), and “c1” is set as the priority (process when there is a free band) in “band assignment after connection”. On the other hand, the terminal identified by the IP address “135.10.19.2” and the port number “p2” has “a2” as the priority in “connection”, and the priority in “band allocation after connection” ( “B2” is set as the processing related to forced disconnection, and “c2” is set as the priority (processing when there is a free bandwidth) in “band allocation after connection”. Next, the terminal identified by the IP address “135.10.19.3” and the port number “p3” has “a3” as the priority in “connection”, and the priority in “band allocation after connection”. “B3” is set as the (processing related to forced disconnection), and “c3” is set as the priority (processing when there is a free bandwidth) in “band assignment after connection”. Furthermore, the terminal identified by the IP address “135.10.19.4” and the port number “p4” has “a4” as the priority in “connection”, and the priority in “band allocation after connection” ( “B3” is set as the processing related to forced disconnection, and “c4” is set as the priority (processing when there is a free bandwidth) in “band allocation after connection”. Hereinafter, in the same manner, the following terminals have the priority in “connection”, the priority in “band assignment after connection” (processing related to forced disconnection), and the priority in “band assignment after connection” (when there is a free band) Process) is set.

  When each integrated GW apparatus 2-1 to 2-n receives a notification of a normal state from the communication control unit 11, it connects each time there is a line / session connection request from the terminal specified by the IP address and port number. I do.

  Further, when each integrated GW apparatus 2-1 to 2-n receives a notification of bandwidth limitation # 1 from the communication control unit 11, even if there is a free bandwidth, a session having a priority c3 or lower, that is, an IP address “135.10”. .19.3 ”and the port number“ p3 ”and the minimum bandwidth guarantee for connection requests from the terminal specified by the IP address“ 135.10.19.4 ”and the port number“ p4 ”. No bandwidth is reserved, and a new session of priority a3, that is, a new connection request from these terminals is not connected.

Further, when each integrated GW apparatus 2-1 to 2-n receives a notification of bandwidth limitation # 2 from the communication control unit 11, even if there is a free bandwidth, a session having a priority level c3 or lower, that is, an IP address “135.10”. .19.3 ”and the port number“ p3 ”, and the satellite resource receives a connection request from a terminal specified by the IP address“ 135.10.19.4 ”and the port number“ p4 ”. Disconnect to R _2OUT % or less, and do not connect sessions with priority a3, that is, connection requests from these terminals.

  When each integrated GW apparatus 2-1 to 2-n is notified of the connection restriction state from the communication control unit 11, since the available bandwidth is completely insufficient, priority control is performed by forcibly disconnecting / connecting the line and session. Do. In this case, the priority connection target is a terminal identified by the priority a1, that is, the IP address “135.10.19.1” and the port number “p1”, and the disconnection target is the priority a3, that is, the IP address “ A terminal identified by “135.10.19.3” and a port number “p3” and a terminal identified by an IP address “135.10.19.4” and a port number “p4”.

  As described above, in this embodiment, there is a call request with high priority by performing priority control and bandwidth control for each satellite line 201 to 203 based on the restriction state according to the traffic of the satellite lines 201 to 203. Even in this case, it is possible to assign a line to a call request having a higher priority without disconnecting a call having a lower priority. As a result, it is not necessary to wait for the time until the disconnection process is completed, the time for the assignment process can be shortened, and the time until the line is assigned to a call request with a high priority can be shortened.

It is a block diagram which shows the structure of the satellite communication system by embodiment of this invention. It is a figure which shows operation | movement of the satellite communication system by one Example of this invention. It is a block diagram which shows the structural example of the communication control station by one Example of this invention. It is a figure which shows the example of a setting of the priority of reception of the call request by one Example of this invention. It is a figure which shows the list | wrist of the problem which may occur by control of the satellite communication by one Example of this invention, and its countermeasure. It is a figure which shows the state transition of each part in the communication control station of FIG. It is a flowchart which shows the operation | movement of the communication control station of FIG. It is a flowchart which shows the operation | movement of the communication control station of FIG. It is a flowchart which shows operation | movement of the integrated GW apparatus of FIG. 7 is a table for priority control and bandwidth control used in the integrated GW apparatus shown in FIG. 6.

Explanation of symbols

1 Communication control station 2,2-1 to 2-n Integrated GW equipment 3,3-1 to 3-3 Satellite GW (X-CDMA)
4,4-1 to 4-3 Satellite GW (X-FDMA)
5,5-1 to 5-3 Satellite GW (Ku)
6, 6-1 to 6-9 Terminals 7-1 and 7-2 Satellite communication control device 8-1 and 8-2 Satellite communication equipment 11 Communication control unit 12 Line control unit 21 Packet holding unit 101 to 103 Network 201 to 203 Satellite line

Claims (16)

A satellite communication system including an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels, and a communication control station that performs channel allocation control and control of the integrated gateway device for each satellite channel. And
The communication control station includes a line control means for monitoring a communication status for each satellite line, and performs communication with a lower priority based on a monitoring result of the line control means before the state of congestion of the satellite line is detected. Communication control means for notifying restriction information for restriction to the integrated gateway device,
The satellite communication system, wherein the integrated gateway device includes means for performing priority control and bandwidth control for restricting lower priority communication based on the restriction information from the communication control station.   The integrated gateway device uses the restriction status information as the restriction information so that the communication control means restricts the lower priority communication every time the traffic on the satellite line exceeds a preset threshold. The satellite communication system according to claim 1, wherein:   The means for performing priority control and bandwidth control performs suppression of new acceptance of communication with a priority set in advance based on at least the restriction state information and disconnects / connects communication with the priority. Item 3. The satellite communication system according to Item 2.   The plurality of satellite channels include a satellite channel corresponding to at least an X-band CDMA (Code Division Multiple Access) communication satellite, a satellite channel corresponding to an X-band FDMA (Frequency Division Multiple Access) communication satellite, and a Ku-band satellite channel. The satellite communication system according to any one of claims 1 to 3, further comprising a satellite line corresponding to a communication satellite. A communication control station that at least performs control of an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels and channel allocation control for each satellite channel,
Line control means for monitoring the communication status of each satellite line;
Communication control means for notifying the integrated gateway device of restriction information for restricting lower priority communication based on the monitoring result of the line control means before the congestion state of the satellite line is detected. ,
The communication control station, wherein the integrated gateway device performs priority control and bandwidth control for restricting lower priority communication based on the restriction information from the communication control means.   The integrated gateway device uses the restriction status information as the restriction information so that the communication control means restricts the lower priority communication every time the traffic on the satellite line exceeds a preset threshold. The communication control station according to claim 5, wherein the communication control station is notified.   The communication according to claim 6, wherein the integrated gateway device suppresses new acceptance of communication with a priority set in advance based on at least the restriction state information and disconnects / connects communication with the priority. Control department.   The plurality of satellite links are at least a satellite link corresponding to an X band CDMA (Code Division Multiple Access) communication satellite, an X band FDMA (Frequency Division Multiple Access) communication satellite, and a Ku band. The communication control station according to claim 5, further comprising a satellite line corresponding to a communication satellite. An integrated gateway device that performs satellite communication between terminals using a plurality of satellite channels based on control of a communication control station that performs channel allocation control at least for each satellite channel,
When restriction information is sent from the communication control station for restricting lower-priority communication before the congestion state of the satellite line is detected based on the monitoring result of the communication state for each satellite line. An integrated gateway device comprising means for performing priority control and bandwidth control for restricting lower priority communication based on the restriction information.   The restriction information from the communication control station is restriction state information for restricting lower priority communication for each satellite line every time the traffic of the satellite line exceeds a preset threshold. The integrated gateway apparatus according to claim 9, wherein the integrated gateway apparatus is provided.   The means for performing priority control and bandwidth control performs suppression of new acceptance of communication with a priority set in advance based on at least the restriction state information and disconnects / connects communication with the priority. Item 11. The integrated gateway device according to Item 10.   The plurality of satellite links are at least a satellite link corresponding to an X band CDMA (Code Division Multiple Access) communication satellite, an X band FDMA (Frequency Division Multiple Access) communication satellite, and a Ku band. The integrated gateway device according to claim 9, further comprising a satellite line corresponding to a communication satellite. Used in a satellite communication system including an integrated gateway device for performing satellite communication between terminals using a plurality of satellite channels, and a communication control station that performs channel allocation control and control of the integrated gateway device at least for each satellite channel A priority control method,
The communication control station monitors the communication status of each satellite line, and restriction information for restricting lower-priority communication based on the monitoring result before the congestion state of the satellite line is detected And processing to notify the integrated gateway device,
The priority control method, wherein the integrated gateway device executes processing for performing priority control and bandwidth control for restricting lower priority communication based on the restriction information from the communication control station.   The process of notifying restriction information for restricting lower priority communication is restricted for each satellite line every time the traffic on the satellite line exceeds a preset threshold. The priority control method according to claim 13, wherein the restriction state information is notified to the integrated gateway device so as to do so.   The processing for performing priority control and bandwidth control is characterized in that new acceptance of communication with a priority set in advance based on at least the restriction status information is suppressed and disconnection / connection of communication with the priority is performed. Item 15. The priority control method according to Item 14.   The plurality of satellite links are at least a satellite link corresponding to an X band CDMA (Code Division Multiple Access) communication satellite, an X band FDMA (Frequency Division Multiple Access) communication satellite, and a Ku band. 16. The priority control method according to claim 13, further comprising a satellite line corresponding to a communication satellite.

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