WO2023209886A1

WO2023209886A1 - Signal processing device, signal processing system, and signal processing method

Info

Publication number: WO2023209886A1
Application number: PCT/JP2022/019136
Authority: WO
Inventors: 満西野; 史洋山下; 順一阿部
Original assignee: 日本電信電話株式会社
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2023-11-02

Abstract

Provided is a signal processing device that processes signals of an internet telephone using a communications satellite. The purpose of the present invention is to restrict the number of calls and ensure call quality without worsening congestion in the uplink direction from a terminal station to a base station when there are many call requests. A signal processing device 12 comprises a downlink signal identification unit 46 that identifies a user ID included in a call request from a partner terminal 24. When the relationship between a calling user count b and a simultaneous usage upper limit S satisfies b<S, a call information management unit 52 causes a downlink signal control unit 48 to permit the call of the user ID. However, if b≧S, the downlink signal control unit 48 is made to discard the call request, and a call management signal generation unit 58 is made to notify the partner terminal 24 corresponding to the user ID that the call is in a waiting state and also of the position in the wait sequence.

Description

Signal processing device, signal processing system, and signal processing method

This disclosure relates to a signal processing device, a signal processing system, and a signal processing method suitable for performing Internet telephone communication using a communication satellite.

Figure 1 shows an example of the configuration of a communication system using communication satellites. In FIG. 1, a user terminal 10 such as a smart phone is connected to a terminal station 14 via a terminal station signal processing device 12. Terminal station 14 can establish communication with base station 18 via communication satellite 16 . The base station 18 can establish a connection with a communication partner user terminal (hereinafter referred to as "partner terminal") 24 via a base station signal processing device 20 and the Internet 22.

As a result, in the system shown in FIG. 1, communication data can be transmitted and received both in the up direction from the terminal station 14 to the base station 18 and in the down direction from the base station 18 to the terminal station 14. If a voice call application is installed on the user terminal 10 and the other party's terminal 24, it is possible to make a call using an Internet telephone.

Internet telephone is a type of VoIP (Voice over Internet Protocol) telephone. It enables calls using SNS (Social Networking Service) voice calling apps, etc. using the Internet without using a dedicated IP telephone network. Here, management of calls using telephone numbers is not performed.

In satellite communications, a device with lower transmission output than the base station is often used on the terminal side, with emphasis on portability. As a result, the communication speed becomes asymmetrical as shown in FIG. 1, and the communication system generally has an uplink communication speed lower than a downlink communication speed.

FIG. 2 shows an example of Internet telephone communication in a satellite communication system using the communication satellite 16. A plurality of user terminals 10 exist under the terminal station 14. These user terminals 10 respond to incoming Internet telephone calls at random timings issued by the other party's terminal 24.

The communication speed of internet calls using SNS apps such as LINE (registered trademark) phone depends on the app, but the average speed is approximately 50 kbps. On the other hand, the communication speed between satellites is generally low, and the uplink speed is often even lower than the downlink speed. For example, Non-Patent Document 1 discloses a satellite communication system for disaster countermeasures in which the downlink speed is 1.5 Mbps and the uplink speed is 384 kbps. If more than seven user terminals 10, each with a communication speed of 50 kbps, use the system at the same time, the uplink communication speed will exceed the limit even if there is a margin for the downlink communication speed. As a result, a situation arises in which upstream data is randomly discarded.

When communication data is discarded in this way, the quality of Internet telephone calls for all users deteriorates. Therefore, in order to prevent deterioration of telephone quality, it is necessary to prevent data from being discarded.

In order to prevent data from being discarded, it is effective to reduce the number of user terminals 10 that are used simultaneously. However, it is difficult to control the number of user terminals 10 used. Therefore, a method can be considered in which the terminal station signal processing device 12 is made to recognize a user ID such as an IP address assigned to each user terminal 10, and an upper limit is set on the number of uplink users who are allowed simultaneous access.

Figure 3 shows an example of its operation. In the example shown in FIG. 3, the terminal station signal processing device 12 recognizes user IDs and sets an upper limit on the number of users that can be used simultaneously. If the number of requests for simultaneous use exceeds a preset upper limit, the communication data of the user ID corresponding to the portion exceeding the upper limit is discarded. According to such an operation, the amount of uplink communication data from the user terminal 10 can be kept within the communication capacity of the satellite section, and the quality of the communication data that is approved for use can be ensured.

However, if an upper limit is set on the number of users that can be used at the same time and control is performed to prevent the number from exceeding the upper limit, the other party's terminal 24 that requests a call when the number of users exceeds the upper limit will be subject to terminal station signal processing. Since the data is discarded by the device 12, it becomes impossible to start a call. In this case, the user of the other party's terminal 24 to whom usage restrictions have been imposed does not necessarily give up the call request and wait. Rather, a user whose usage is restricted is likely to repeatedly request a call until he or she becomes able to do so. As a result, the traffic in the downlink (base station ⇒ terminal station) direction further increases, and in response, the data in the uplink direction (terminal station ⇒ base station) also increases, leading to a situation where the uplink congestion situation worsens. easy.

FIG. 4 shows an example where the congestion condition in the upstream direction from the terminal station 14 to the base station 18 worsens. Let a be the number of call requests from the other party's terminal 24, b be the number of users currently talking, and S be the upper limit number of users who are allowed to use Internet telephones at the same time. In response to the call request a from the other party's terminal 24, a-(S-b) loses the call. A user whose call is lost cannot make a call. If the user of the terminal 24 on the other end of a-(S-b), which lost the call, calls again without giving up on the call, the number of call requests will increase, further worsening the congestion state.

The present invention has been made in view of the above-mentioned problems, and when the number of call requests from the other party's terminal increases in Internet telephone calls using communication satellites, the call volume in the downlink (base station ⇒ terminal station) direction increases. The primary objective is to provide a signal processing device that limits the number of calls and ensures call quality without causing worsening of congestion in the uplink (terminal station ⇒ base station) direction that may occur due to do.

In addition, the present invention is designed to reduce the number of uplink calls that may occur due to an increase in the call volume in the downlink (base station ⇒ terminal station) direction when the number of call requests from the other party's terminal increases in Internet telephone calls using communication satellites. A second object is to provide a signal processing system that limits the number of calls and ensures call quality without causing worsening of congestion in the terminal station ⇒ base station direction.

Furthermore, the present invention is designed to reduce the number of uplink calls that may occur due to an increase in the call volume in the direction of the downlink (base station ⇒ terminal station) when the number of call requests from the other party's terminal increases in Internet telephone calls using communication satellites. A third object of the present invention is to provide a signal processing method for limiting the number of calls and ensuring call quality without causing worsening of congestion in the terminal station ⇒ base station direction.

In order to achieve the above object, a first aspect is a signal processing device that processes Internet telephone signals using a communication satellite,
A process for identifying a user ID included in a call request received from a partner terminal via the communication satellite;
A process of permitting the user ID to make a call when the relationship b<S is established between the number of users b who are on the phone and the upper limit S of the number of simultaneous users;
If the relationship b≧S is established between the b and the S, the call request is discarded, and the other party terminal corresponding to the user ID is informed that it is in a waiting state for a call and the order of waiting. processing to notify the
When the relationship b<S is established, a process of notifying the other party terminal corresponding to the user ID located at the head of the call waiting list that the call request can be accepted;
It is preferable that the system be configured to run .

Further, a second aspect is a signal processing system that provides Internet telephony using a communication satellite,
a signal processing device;
comprising the signal processing device and a partner terminal capable of communicating via the communication satellite,
The signal processing device includes:
A process for identifying a user ID included in a call request received from the other party's terminal;
A process of permitting the user ID to make a call when the relationship b<S is established between the number of users b who are on the phone and the upper limit S of the number of simultaneous users;
If the relationship b≧S is established between the b and the S, the call request is discarded, and the other party terminal corresponding to the user ID is informed that it is in a waiting state for a call and the order of waiting. processing to notify the
When the relationship b<S is established, a process of notifying the other party terminal corresponding to the user ID located at the head of the call waiting list that the call request can be accepted;
It is preferable that the system be configured to run .

Further, a third aspect is a signal processing method for providing Internet telephony using a communication satellite, comprising:
a step in which the signal processing device identifies a user ID included in a call request received from a partner terminal with which the signal processing device can communicate via the communication satellite;
a step in which the signal processing device allows the user ID to make a call when a relationship b<S is established between the number b of users currently talking and the upper limit S of the number of simultaneous users;
When the relationship b≧S is established between the b and the S, the signal processing device discards the call request and sends the other party terminal corresponding to the user ID to a call waiting state. a step of notifying the person and the waiting order;
the signal processing device notifying the partner terminal corresponding to the user ID located at the head of the call queue that the call request can be accepted when the relationship b<S is established;
It is desirable to include.

According to the first to third aspects, when the number of call requests from the other party's terminal increases in Internet telephone calls using communication satellites, this problem may occur due to an increase in the call volume in the direction of downlink (base station ⇒ terminal station). It is possible to limit the number of calls without causing worsening of congestion in the upward direction (terminal station ⇒ base station). Therefore, according to these aspects, it is possible to always maintain good call quality in Internet telephone calls using communication satellites.

An example of the configuration of a communication system using communication satellites is shown. An example of Internet telephone communication in a satellite communication system using communication satellites is shown. In the satellite communication system, an example of operation is shown in which a terminal station signal processing device sets an upper limit on the number of partner terminals that can be accessed simultaneously. An example will be shown in which, in a satellite communication system, an increase in downlink call requests from the base station to the terminal station worsens the upstream congestion state from the terminal station to the base station. FIG. 1 is a diagram for explaining the configuration of a signal processing system according to Embodiment 1 of the present disclosure. An example of a busy list used in Embodiment 1 of the present disclosure is shown. An example of a call waiting list used in Embodiment 1 of the present disclosure is shown. 3 is a flowchart for explaining the flow of processing in Embodiment 1 of the present disclosure. 12 is a flowchart for explaining the flow of processing in Embodiment 2 of the present disclosure. FIG. 3 is a diagram for explaining the configuration of a signal processing system according to Embodiment 3 of the present disclosure. 12 is a timing chart for explaining a modification example in which SIP messages are used for Internet telephone call management.

Embodiment 1.
[Configuration of Embodiment 1]
Embodiment 1 of the present disclosure can be used in the satellite communication system described with reference to FIG. FIG. 5 is a block diagram for explaining a configuration specific to the system according to Embodiment 1 of the present disclosure. Note that in FIG. 5, elements common to those shown in FIG. 1 are given the same reference numerals.

As shown in FIG. 5, the system of this embodiment includes a user terminal 10. The user terminal 10 can communicate with the terminal station 14 via the terminal station signal processing device 12 . Terminal station 14 can communicate with counterpart terminal 24 via satellite network 30 . The satellite network includes communications satellites 16 and base stations 18 shown in FIG. By using this system, the user terminal 10 can establish wireless communication with the partner terminal 24 in both up and down directions.

The user terminal 10 is a terminal located on the terminal station 14 side when viewed from the satellite network 30. The user terminal 10 includes a transmitter 32 and a receiver 34. The terminal station signal processing device 12 includes an uplink receiving unit 36 that receives a signal input from the transmitting unit 32 of the user terminal 10, an uplink signal identification unit 38 that identifies uplink signals, an uplink signal control unit 40 that controls uplink signals, and an uplink transmitter 42 that sends the controlled uplink signal to the partner terminal 24 via the terminal station 14. The terminal station signal processing device 12 also includes a downlink receiving unit 44 that receives a downlink signal from the partner terminal 24 via the terminal station 14, a downlink signal identification unit 46 that identifies the downlink signal, and a downlink signal control unit that controls the downlink signal. 48, and a downlink transmitter 50 that transmits the controlled downlink signal to the receiver 34 of the user terminal 10.

The terminal station signal processing device 12 further includes a call information management section 52 that manages call information. The call information management section 52 includes a call list 54 and a call waiting list 56. More specifically, the call information management unit 52 includes a storage that stores a call list 54 and a call waiting list 56. The terminal station signal processing device 12 includes a call management signal generation section 58 that can access its storage.

The call management signal generation unit 58 generates a call management signal by referring to the call list 54 and the call waiting list 56 stored in the storage. The call management signal generator 58 can provide the generated call management signal to the other party's terminal 24 via the uplink transmitter 42 .

The partner terminal 24 includes a partner terminal receiving section 60 and a partner terminal transmitting section 62. The partner terminal receiving section 60 can receive a signal from the terminal station signal processing device 12 via the terminal station 14 and the satellite network 30. Further, the other party terminal transmitter 62 can transmit a signal to the terminal station signal processing device 12 via the satellite network 30 and the terminal station 14.

Hereinafter, an example of the operation of traffic control in this embodiment will be explained based on the same figure.
In FIG. 5, when a call request signal is input from the other party's terminal 24 to the terminal station signal processing device 12, the user ID of the other party's terminal 24 is identified in the downlink signal identification section 46. Then, the downlink signal identification unit 46 notifies the call information management unit 52 that a call request has occurred and the user ID thereof.

Upon receiving the above notification, the call information management unit 52 checks the call list 54 and the call waiting list 56.

FIG. 6A shows an example of the call list 54 stored in the call information management unit 52. As shown in the figure, the user ID of the other party's terminal 24 that is the originator, the user ID of the user terminal 10 that is the destination of the call, and the confirmation time of the call start signal are recorded here in consecutive numbers.

FIG. 6B shows an example of the call waiting list 56 stored in the call information management unit 52. As shown in the figure, the user ID of the other party's terminal 24 that is the source of the call request and the confirmation time of the call request signal are recorded here as serial numbers.

The call information management unit 52 compares the number b of users currently on the phone with the upper limit number S that allows simultaneous use, and if b<S, instructs the downlink signal control unit 48 to pass a signal requesting a call request. Instruct. As a result, the other party's terminal 24 becomes ready to start a telephone conversation.

Thereafter, when the downlink signal identification unit 46 detects a call start signal for the corresponding user ID, it notifies the call information management unit 52 of the user ID in progress. The call information management unit 52 registers the user ID of the user currently on the phone call list 54, and adds 1 to the number b of users currently on the phone.

Thereafter, when the downlink signal identification unit 46 detects a call termination signal for the corresponding user ID, it notifies the call information management unit 52 of the user ID that terminated the call. When the call information management unit 52 receives this notification, it deletes the user ID that has terminated the call from the call list 54 and subtracts 1 from the number b of users currently on the call.

The call information management unit 52 instructs the downlink signal control unit 48 to discard the communication start request signal if b≧S when receiving the notification of the occurrence of a call request from the downlink signal identification unit 46. At the same time, the corresponding user ID is registered at the end of the call waiting list 56. Further, the call information management section 52 instructs the call management signal generation section 58 to notify the corresponding terminal 24 of the fact that the terminal is in a waiting state for a call and information indicating the order of waiting. The call management signal generation unit 58 notifies the other party terminal 24 of the corresponding user ID via the uplink transmission unit 42 of the signal generated in accordance with the instruction.

The information in the call list 54 and the call waiting list 56 is synchronized as appropriate. For example, if the user ID located at the head of the call waiting list is added to the call waiting list 54, that user ID is deleted from the call waiting list 56. The call information management unit 52 periodically acquires the latest information from these lists and checks whether the corresponding user ID is capable of making a call request. That is, it is checked whether the relationship b<S holds true and the corresponding user ID is located at the head of the call waiting list 56. When it is confirmed that the call request can be accepted, the call management signal generation unit 58 is instructed to notify the corresponding partner terminal 24 that the call request can be accepted, and the corresponding user ID is added to the call waiting list. Delete from. The call management signal generation unit 58 notifies the other party terminal 24 of the corresponding user ID of the signal generated in response to the instruction via the uplink transmission unit 42.

Incidentally, even if the corresponding user ID is not capable of making a call request, information representing the call waiting state and the waiting order may be periodically notified to the other party's terminal 24.

In this embodiment, the user of the other party's terminal 24 determines the timing for transmitting the call request signal based on information such as the call waiting state and the waiting order transmitted from the call management signal generation unit 58. to decide. Therefore, even if the other party terminal 24 of the corresponding user ID receives the notification, if the user does not request a call, the call will not start. If the user issues a call request again, the user will end up at the end of the waiting list.

[Operation of Embodiment 1]
FIG. 7 is a flowchart showing the flow of the above processing executed in the terminal station signal processing device 12 of this embodiment. As shown in the figure, when the terminal station signal processing device 12 confirms the call request signal from the partner terminal 24 (step 100), it acquires the latest information from the call list 54 (step 102), and determines the number of users b who are currently talking. and the upper limit S of the number of simultaneous uses (step 104).

If the latest b acquired from the call list 54 satisfies the relationship b<S, the call request signal is passed (step 106). Thereafter, when the call start signal is confirmed (step 108), the user ID currently on the call is registered in the

call list

54, and 1 is added to the value of b (step 110).

Thereafter, the busy state continues until the end of call signal is confirmed, and when the end of call signal is confirmed (step 112), the user ID that has ended the call is deleted from the

active call list

54, and 1 is decremented from the value of b. Subtract (step 114).

On the other hand, if it is determined in step 104 that the relationship b≧S holds for the latest b, the call request signal is discarded and the corresponding user ID is registered at the end of the call waiting list 56. Further, the terminal 24 of the corresponding user ID is notified of the fact that it is in a call waiting state and its order (step 116).

After that, the latest information is periodically obtained from the list (step 118), and the user ID is confirmed to be able to request a call, that is, b<S, and the user ID is at the top of the call waiting list 56. It is confirmed that there is one (step 120). When the status is confirmed, the terminal 24 of the corresponding user ID is notified that the call request can be accepted, and the corresponding user ID is deleted from the call waiting list 56 (step 122).

Note that, as described above, even if the corresponding user ID is not capable of requesting a call, the other party's terminal 24 may be periodically notified of the fact that it is in a call waiting state and information regarding the waiting order.

As explained above, in this embodiment, by recognizing the user ID of the other party's terminal 24, the call list 54, which manages the number b of users on a call and their user IDs, and the number of users waiting for calls and their user IDs are created. A call waiting list 56 can be created to manage the calls. Then, by using the information in those lists, it is possible to notify the user that the user is in a waiting state for a call, as well as information indicating the waiting order. Upon receiving such notification, the user of the other party's terminal 24 can appropriately control downlink traffic in order to avoid unnecessary repeated re-calls. If the number of downstream re-calls does not increase unnecessarily, further deterioration of the upstream congestion state can be avoided. Therefore, according to the system of this embodiment, when the number of call requests from the user terminal 10 increases in the Internet telephone using the communication satellite 16, the number of calls can be appropriately increased without worsening the congestion state in the upstream direction. can ensure good call quality.

Incidentally, in the first embodiment described above, the user ID is managed for each partner terminal 24, but the present disclosure is not limited to this. For example, the user ID may be managed for each Internet phone call, that is, for each call. This point also applies to other embodiments described below.

Furthermore, in the first embodiment described above, the call information management unit 52 registers the corresponding user ID in the call waiting list 56 without checking the status of the call waiting list 56 when b≧S. However, the present disclosure is not limited thereto. For example, in the case of b≧S, before registering the user ID in the call waiting list 56, it may be checked whether the user ID has already been registered in the call waiting list 56. If the user ID in question is not registered, the user ID is registered at the end of the call waiting list, and if it is already registered, the registration is temporarily deleted and then the user ID is registered at the end of the waiting list. The ID may be registered at the end of the call waiting list 56.

Embodiment 2.
Next, a second embodiment of the present disclosure will be described with reference to FIG. 8 together with FIGS. 1 and 5. Embodiment 2 of the present disclosure can be used in the satellite communication system described with reference to FIG. 1 similarly to Embodiment 1. The system of this embodiment can be realized by causing the terminal station signal processing device 12 shown in FIG. 5 to execute processing according to the flowchart shown in FIG. 8 instead of the flowchart shown in FIG. 7. .

In the first embodiment described above, when the call information management unit 52 determines that b≧S, the call information management unit 52 registers the corresponding user ID in the call waiting list 56 without checking the status of the call waiting list 56. It is said that On the other hand, in the present embodiment, when it is determined that b≧S, before registering the corresponding user ID in the call waiting list 56, check if the user ID has already been registered in the call waiting list 56. Check whether or not. If the user ID in question has not been registered, it will be registered at the end of the call waiting list; if it has been registered, it will be deleted once, and then the user ID in question will be registered. is registered at the end of the call waiting list 56.

FIG. 8 is a flowchart for explaining the flow of processing executed by the terminal station signal processing device 12 in this embodiment in order to realize the above functions. Note that in FIG. 8, steps that are the same as those shown in FIG.

In the flowchart shown in FIG. 8, when it is determined in step 104 that b≧S, the call request signal is discarded as in the first embodiment, and the corresponding user ID is added to the call waiting list. 56 (step 130). If the corresponding user ID has already been registered in the call waiting list 56 (step 132), the registration is deleted (step 134), and the corresponding user ID is newly registered at the end of the call waiting list 56. (Step 136).

If the user of the other party's terminal 24 who is waiting for a call is placed at the end of the queue every time he requests a call, he will avoid unnecessary call requests. In other words, according to the present embodiment, the user can be prompted to refrain from making a repeat request until he/she receives a notification that the call request can be accepted. Therefore, according to the present embodiment, it is possible to more efficiently avoid deterioration of the congestion state than in the case of Embodiment 1, and it is possible to provide the user with even better call quality.

Embodiment 3.
Next, a third embodiment of the present disclosure will be described with reference to FIG. 1 and FIG. 9. Embodiment 3 of the present disclosure can be used in the satellite communication system described with reference to FIG. 1 similarly to Embodiment 1.

FIG. 9 is a block diagram for explaining a configuration specific to the system according to Embodiment 2 of the present disclosure. Note that in FIG. 9, elements corresponding to those described with reference to FIG. 5 are given the same reference numerals, and the description thereof will be simplified or omitted.

As shown in FIG. 9, in the system of this embodiment, the other party's terminal 24 is equipped with a terminal call management application 64. The terminal call management application 64 has a function of recognizing the call waiting state and waiting order information transmitted from the call management signal generation unit 58 of the terminal station signal processing device 12 and autonomously issuing a call request signal at an appropriate timing. have. More specifically, upon receiving a signal indicating that a call request can be accepted from the call management signal generation unit 58, the terminal call management application 64 promptly resends the communication request. Therefore, in this embodiment, it is possible to have the other party terminal 24 of the corresponding user ID start a call at an appropriate timing, and the user is freed from the trouble of having to spontaneously issue a re-request at a timely manner. I can do it.

[Modifications of Embodiments 1 to 3]
FIG. 10 is a timing chart for explaining a method of using SIP (Session Initiation Protocol) messages for Internet telephone call management. Internet telephony typically uses SIP to manage calls. In this case, a SIP message can be used as the user ID, etc. used in the first to third embodiments. Specifically, for example, the IP address information included in (0) REGISTER can be used as the user ID. (1) INVITE can be used as a call request signal. Furthermore, (4) ACK can be used as a call start signal. Furthermore, (6) BYE followed by (7) 200 OK can be used as a call termination signal.

Further, in the first to third embodiments described above, a specific user is allowed to continue talking over a long period of time, but the present disclosure is not limited to this. For example, the call start signal confirmation time recorded in the call list 54 may be used to forcibly discard the frame and terminate the call with the corresponding ID when the call time has elapsed for a certain period of time. .

10 User terminal 12 Terminal station signal processing device 14 Terminal station 16 Communication satellite 18 Base station 24 Partner terminal 52 Call information management section 54 Calling list 56 Call waiting list 58 Call management signal generation section 64 Terminal call management application

Claims

A signal processing device that processes Internet telephone signals using a communication satellite,
A process for identifying a user ID included in a call request received from a partner terminal via the communication satellite;
A process of permitting the user ID to make a call when the relationship b<S is established between the number of users b who are on the phone and the upper limit S of the number of simultaneous users;
If the relationship b≧S is established between the above b and the above S, the call request is discarded, and the other party terminal corresponding to the user ID is informed that it is in a call waiting state and the waiting order. processing to notify the
When the relationship b<S is satisfied, a process of notifying the other party terminal corresponding to the user ID located at the head of the call waiting list that the call request can be accepted;
A signal processing device configured to perform.
The signal processing device includes:
Equipped with storage that stores the calling list,
a process of adding 1 to a serial number in the call list when a call start signal from the partner terminal is confirmed;
a process of subtracting 1 from the serial number in the call list when a call end signal from the other party's terminal is confirmed;
a process of reading the b from the serial number of the calling list;
The signal processing device according to claim 1, further configured to perform the following.
The signal processing device includes:
Equipped with storage for storing call waiting list,
In the case of b≧S, the user ID included in the discarded call request is registered at the end of the call waiting list;
a process of deleting the user ID that has notified that the call request is available from the call waiting list;
a process of reading the waiting order of the user ID from the information on the call waiting list;
The signal processing device according to claim 1 or 2, further configured to execute.
The last registration process is
a process of determining whether the user ID included in the discarded call request is already registered in the call waiting list;
If the user ID has already been registered in the call waiting list, the registration is deleted and the user ID is registered at the end of the list;
The signal processing device according to claim 3, comprising:
A signal processing system that provides Internet telephony using communication satellites,
a signal processing device;
comprising the signal processing device and a partner terminal capable of communicating via the communication satellite,
The signal processing device includes:
A process for identifying a user ID included in a call request received from the other party's terminal;
A process of permitting the user ID to make a call when the relationship b<S is established between the number of users b who are on the phone and the upper limit S of the number of simultaneous users;
If the relationship b≧S is established between the above b and the above S, the call request is discarded, and the other party terminal corresponding to the user ID is informed that it is in a call waiting state and the waiting order. processing to notify the
When the relationship b<S is satisfied, a process of notifying the other party terminal corresponding to the user ID located at the head of the call waiting list that the call request can be accepted;
A signal processing system configured to perform.
6. The signal processing system according to claim 5, wherein the partner terminal has a built-in terminal call management application that autonomously resends the communication request upon receiving the notification that the call request can be accepted.
A signal processing method for providing Internet telephony using a communication satellite, the method comprising:
a step in which the signal processing device identifies a user ID included in a call request received from a partner terminal with which the signal processing device can communicate via the communication satellite;
a step in which the signal processing device allows the user ID to make a call when a relationship b<S is established between the number b of users currently talking and the upper limit S of the number of simultaneous users;
When the relationship b≧S is established between the b and the S, the signal processing device discards the call request and sends the other party terminal corresponding to the user ID to a call waiting state. a step of notifying the person and the waiting order;
the signal processing device notifying the partner terminal corresponding to the user ID located at the head of the call queue that the call request can be accepted when the relationship b<S is established;
signal processing methods including;
8. The signal processing method according to claim 7, further comprising the step of the partner terminal receiving the notification that the call request can be accepted autonomously retransmitting the communication request.