JP2007053528A - Dependence connection method in group communication system, terminal, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, a terminal, and a program capable of continuing group communication, even if there is a terminal where a utilization communication bandwidth is narrow substantially, or the throughput is low as compared with other members, in a group communication system. <P>SOLUTION: The group communication system comprises a plurality of independent terminals for mutually communicating data in a first media format. In this case, there are provided a first step for selecting one of the independent terminals as a representative terminal according to the loaded state of the independent terminal; a second step for connecting a terminal, belonging to a group to the representative one dependent, set as a dependent terminal; and a third step for adjusting the media format between the data in the first media format transmitted and received to and from the independent terminal, and those in a second media format transmitted and received to and from the dependent terminal by the representative terminal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a slave connection method, a terminal, and a program in a group communication system.

  The fixed communication network is generally connected by wire, and allows a large amount of data to be transferred because the use communication band is wide and the network is stable. On the other hand, mobile communication networks are generally connected wirelessly and can provide services in consideration of the mobility of terminals, although the communication bandwidth is narrow. A terminal connected to a fixed communication network (hereinafter referred to as “fixed terminal”) generally has a higher processing capacity and a high-level media format than a terminal connected to a mobile communication network (hereinafter referred to as “mobile terminal”). User data can be processed.

  In recent years, a group communication service including a plurality of terminals as members is provided under a ubiquitous environment. In this environment, the fixed communication network and the mobile communication network coexist, and therefore, the used communication band and the processing capability are greatly different among the terminals that are members of the group communication.

  Conventionally, there is a service switching method that can dynamically switch terminals without disconnecting a session as a system that considers real-time characteristics (see, for example, Non-Patent Document 1). This method is intended for one-to-one communication, and a terminal can be switched by transmitting and receiving a switching control message between two terminals via a session management server.

  FIG. 1 is a configuration diagram of a group communication system in the prior art.

  The system of FIG. 1 constitutes one group A having terminals 11 to 13 as members, and user data is transmitted and received between terminals in a broadcast manner. In addition, a session management server 3 that manages sessions of terminals belonging to the group A is provided. The session management server 3 manages the group management table 31 for the group A. The group management table 31 manages terminal identifiers that are members constituting the group A. Each of the terminals 11 to 13 transmits / receives control data, which is session information, to / from the session management server 3. According to FIG. 1, it is assumed that the terminals 11 to 13 are connected to a fixed communication network, have a wide communication band and high processing capability.

  In such a system configuration, a mobile terminal having a narrow communication bandwidth and low processing capability, such as a mobile phone, may join as a member of the group. In addition, a user who operates the terminal 13 may desire to continue using the group communication service on the mobile phone 23 as well.

  For example, when the mobile phone 23 joins the group A, the mobile phone 23 transmits a message for joining the group A to the session management server 3. When switching from the terminal 13 to the mobile phone 23, the terminal 13 further transmits a message for withdrawing from the group A to the session management server 3. As a result, group communication with the terminal 11, the terminal 12, and the mobile phone 23 as members is realized.

N. Imai, M. Isomura and H. Horiuchi, `` Service Initiation and Migration for Real-time Communication Service in the Ubiquitous Networking Environment '', Information Science, vol. 45, no. 12, 2004 Rosenberg. J Peterson. J, Schulzirinne. H and G. Camarillo, "Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP)", BCP 85, IETF RFC 3235, Apr. 2004

  However, when there is a terminal (for example, a mobile phone) with a narrow communication bandwidth or low processing capability in the group, it becomes a problem which media format should be used to transmit / receive user data. In particular, in a ubiquitous environment in which a plurality of terminals connected to a fixed communication network and a mobile phone connected to a mobile communication network are communicated as a group, the terminal having the narrowest communication bandwidth and the lowest processing capability is used. In addition, it is common to select a media format level.

  When a user operating a fixed terminal switches to a mobile terminal and performs group communication, user data in a media format at a level transmitted and received between the fixed terminals congests the communication band in the mobile terminal, In addition, the application cannot be processed. As a result, packet loss occurs and group communication service cannot be continued. That is, the difference in the use communication band and the processing capability between the members in the group affects the group communication service.

  Therefore, the present invention provides a method for continuing group communication even in a group communication system even when there is a terminal whose communication bandwidth is significantly narrower or processing capacity is lower than other members. An object is to provide a terminal and a program.

According to the present invention, a group communication system composed of a plurality of independent terminals that mutually communicate data in the first media format.
A first step of selecting any one independent terminal as a representative terminal according to a load state of the independent terminal;
A second step of subordinately connecting a terminal belonging to the group as a subordinate terminal to the representative terminal;
The representative terminal has a third step of adjusting a media format between data of a first media format transmitted / received to / from an independent terminal and data of a second media format transmitted / received to / from a dependent terminal. And

According to another embodiment of the subordinate connection method of the present invention,
For the third step, the second media type is also preferably determined according to the performance, bandwidth and / or coding scheme of the slave terminal.

According to another embodiment of the subordinate connection method of the present invention,
The system further includes a session management server having a group management table for managing a load state for each independent terminal,
Regarding the first step, the load state is a used communication band and / or processing capability, and the session management server also preferably selects an independent terminal having a low load state as a representative terminal.

Furthermore, according to another embodiment of the subordinate connection method of the present invention,
When the independent terminal operated by the user is changed to another terminal, if the other terminal has a narrower communication bandwidth and / or lower processing capacity than the independent terminal, the first to third steps Is also preferably performed.

According to the present invention, in a terminal that forms a group with a plurality of terminals and communicates data of the first media format with each other,
A first communication interface for communicating with other terminals constituting the group;
Group communication processing means for performing group communication via the first communication interface;
Representative terminal processing means that functions as a representative terminal to connect other terminals belonging to the group as subordinate terminals;
A second communication interface for communicating with the subordinate terminal;
Media adjustment for adjusting the media format between data of the first media format transmitted / received via the first communication interface and data of the second media format transmitted / received via the second communication interface It is also preferable to have a means.

According to another embodiment of the terminal of the present invention,
In the media adjustment means, it is also preferable that the second media type is determined according to the performance, bandwidth and / or coding scheme of the slave terminal.

Also, according to another embodiment of the terminal of the present invention,
When the representative terminal processing means receives a representative designation request message from the session management server that manages the load state for each terminal that constitutes the group, the representative terminal processing means determines whether to become the representative terminal according to the load state of the terminal. It is also preferable to send a representative terminal designation response to the session management server.

According to the present invention, in a program for configuring a group with a plurality of terminals and functioning a computer mounted on a terminal that communicates data of the first media format with each other,
A first communication interface for communicating with other terminals constituting the group;
Group communication processing means for performing group communication via the first communication interface;
Representative terminal processing means that functions as a representative terminal to connect other terminals belonging to the group as subordinate terminals;
A second communication interface for communicating with the subordinate terminal;
Media adjustment for adjusting the media format between data of the first media format transmitted / received via the first communication interface and data of the second media format transmitted / received via the second communication interface A computer is functioned as means.

According to another embodiment of the program of the present invention,
The media adjustment means preferably causes the computer to function such that the second media type is determined according to the performance, bandwidth and / or coding scheme of the slave terminal.

According to another embodiment of the program of the present invention,
When the representative terminal processing means receives a representative designation request message from the session management server that manages the load state for each terminal that constitutes the group, the representative terminal processing means determines whether to become the representative terminal according to the load state of the terminal. It is also preferable to cause the computer to function so as to transmit the representative terminal designation response to the session management server.

  According to the present invention, in a group communication system, group communication can be continued even when there is a terminal whose use communication band is significantly narrower or processing capacity is lower than other members. In particular, even if a mobile terminal joins a group composed of fixed terminals as a member, the mobility of service can be realized. According to the present invention, the amount of data or line delay is absorbed by the representative terminal by dynamically changing the topology so that the terminal having a narrow communication bandwidth or low processing capability is subordinated to the representative terminal.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Group communication systems include a centralized communication system and a distributed communication system. In the case of a centralized communication system, all data transmitted and received between member terminals passes through the center server. In the case of a distributed communication system, data is directly transmitted and received between terminals. In the following description, it is assumed that the group is configured by a distributed communication system, but it may be a centralized communication system.

  FIG. 2 is a functional configuration diagram of the group communication system according to the present invention.

  When the user operating the terminal 13 desires to switch to the mobile phone 23 and continue the group communication, the mobile phone 23 is dependently connected to the terminal 12 according to FIG. The terminal 12 is designated as the representative terminal of the mobile phone 23 by the session management server 3. The session management server 3 centrally controls sessions of all terminals belonging to the group in order to dynamically change the network topology.

  The representative terminal 12 provides a proxy function to the mobile phone 23. The proxy function of the representative terminal 12 performs media adjustment (or conversion) between user data in the first media format transmitted / received to / from the terminal 11 and user data in the second media format transmitted / received to / from the mobile phone 23. .

  The session management server 3 in the present invention has a terminal function type table and a group management table.

Table 1 below is an example of a terminal function type table.

  The terminal function type table defines performance (CPU / memory), bandwidth, media, profile, and level for each function type A to J. Examples of the media include video (Video), audio (Audio), still image (Picture), and character string (Text).

  Profile represents an encoding function (tool) to be installed in the terminal. For example, if there are many errors due to the nature of the communication network to which the terminal is connected, it is necessary to select a coding scheme that is strong in error resistance. Also, when using an application that requires a small delay, an encoding method with the smallest possible delay should be selected.

  Level specifies the required bit rate. Further, the maximum value such as the frame rate (video), the sampling frequency (audio), and the necessary buffer size may be designated.

Table 2 below is an example of the group management table.

  The group management table stores a CPU / memory utilization rate and a packet loss rate that are in a load state for each terminal identifier of a terminal that is a member for each group. Priorities are specified in order from the terminal with the lowest load state. In accordance with this priority, the representative terminal to which the subordinate terminal is connected in a subordinate manner is selected. In the group management table, media that can be provided as a proxy function, Profile, and the like may be defined. Even if the terminal has a high priority, a terminal that does not have a proxy function to be provided to the subordinate terminal is not selected.

  FIG. 3 is a sequence diagram in the present invention.

(S201) User data is transmitted and received between the terminal 11-terminal 12, the terminal 12-terminal 13, and the terminal 13-terminal 11, thereby realizing group communication. Members constituting the group are managed by the session management server 3.
(S202) It is assumed that the user operating the terminal 13 desires to switch to the mobile phone 23 and continue group communication. At this time, the terminal 13 transmits a “terminal switching request” to the session management server 3 by a user operation. The “terminal switching request” includes, for example, the switching source terminal identifier (terminal 13), the switching destination terminal identifier (terminal 23), and the function type of the switching destination terminal.

  The “terminal switching request” may include an identifier of the function type of the mobile phone 23 defined in advance as shown in Table 1, and the type, performance, bandwidth, media, etc. of the mobile phone 23 It may be included directly. Further, according to S202 of FIG. 2, although the terminal 13 is transmitting the “terminal switching request” to be transmitted to the session management server 3, the mobile phone 23 may transmit it.

(S203) Upon receiving the “terminal switching request” from the terminal 13, the session management server 3 confirms “the function type of the switching destination terminal”. If this function type is significantly narrower than the other members in the group and the processing capacity is low, the representative terminal is selected. For example, when the mobile phone 23 is designated as “the function type of the switching destination terminal”, it is determined that the use communication band is narrow and the processing capability is low, and the representative terminal to which the mobile phone should be subordinate is selected. According to FIG. 2, the session management server 3 refers to the group management table in Table 2 described above and selects the terminal 12 having a high priority as a representative terminal.

  According to the present invention, the session management server 3 periodically receives the load status from terminals that are members belonging to the group. As a result, it is possible to determine the priority order as the representative terminal in order from the terminal with the lowest load state among the terminals belonging to the group. However, a terminal whose load state is a predetermined threshold or more is not selected as a representative terminal. When there is no terminal to be selected as a representative terminal even though there is a dependent terminal, the session management server can also function as a representative terminal for the dependent terminal.

(S204) The session management server 3 transmits a “representation designation request” to the representative terminal 12. The “representative designation request” includes, for example, the function type of the subordinate terminal (mobile phone 23). The terminal type, performance, bandwidth, media, etc. may be included.

(S205) Upon receiving the “representation designation request” from the session management server 3, the terminal 12 determines whether or not the terminal itself can operate as a representative terminal. At this time, the terminal 12 makes a determination based on its own CPU / memory utilization rate and packet loss rate. When it is determined that the terminal 12 can operate as the representative terminal, the terminal 12 transmits a “representative designation response (OK)” to the session management server 3.

(S206) Upon receiving the “representation designation notification (OK)” from the terminal 12, the session management server 3 transmits a “representation designation notification” to the mobile phone 23 serving as the subordinate terminal. The “representative designation notification” includes information indicating that the representative terminal is the terminal 12.
(S207) Upon receiving the “representative designation notification” from the session management server 3, the mobile phone 23 confirms that the representative terminal is the terminal 12. The mobile phone 23 transmits “representation designation confirmation” to the session management server 3. Thereby, the mobile phone 23 performs group communication depending on the terminal 12.

(S208) Upon receiving “representation confirmation” from the mobile phone 23, the session management server 3 sends a “session release request” to release the session with the terminal 13 in order to withdraw the terminal 13 from the group member. Transmit to terminal 11. The “session release request” includes information indicating that the session with the terminal 13 is released.
(S209) The session management server 3 also transmits a “session release request” to the terminal 12. The “session release request” includes information indicating that the session with the terminal 13 is released.

(S210) Thereby, the user who has operated the terminal 13 can use the mobile phone 23 as a member of group communication.
(S211) The mobile phone 23 connects a link with the terminal 12. For example, the link can be connected when the mobile phone 23 makes a call to the representative terminal 12 or when the representative terminal 12 makes a call to the mobile phone.

(S212) User data for group communication can be transmitted and received between the terminal 11-terminal 12, the terminal 12-cell phone 23, and the terminal 11- (representative terminal 12) -cell phone 23. Here, the representative terminal 12 adjusts (or converts) the media format between the data in the first media format transmitted / received to / from the terminal 11 and the data in the second media format transmitted / received to / from the mobile phone 23.

For example, assume that the terminal 11 and the mobile phone 23 have the following function types.

  In the case shown in Table 3, the representative terminal 12 adjusts the user data in the Video + Audio format received from the terminal 11 to the user data in the Audio format and transmits it to the mobile phone 23. Also, the representative terminal 12 converts the MPEG-4 + AAC profile received from the terminal 11 into QSELP and transmits it to the mobile phone 23. On the other hand, the representative terminal 12 converts the QSELP profile received from the mobile phone 23 into MPEG-4 + AAC and transmits it to the terminal 11. As described above, the representative terminal 12 operates as a proxy for the mobile phone 23.

(S213) Then, it is assumed that the load increases in the representative terminal 12. As a criterion for determining that the state is the “overload state”, for example, determination is made based on whether or not the CPU / memory utilization rate and / or the packet loss rate of the representative terminal 12 has reached a predetermined threshold value. For example, when the CPU / memory utilization rate is 70% or more and the packet loss rate is 10% or more, it can be determined that the state is “overloaded”.

(S214) The representative terminal 12 transmits a “representative designation switching request” to the session management server 3 when the representative terminal 12 is in an “overload state”.
(S215) Upon receiving the “representative designation switching request”, the session management server 3 refers to the group management table and selects a terminal with a low load state according to the priority order. According to FIG. 2, for example, it is assumed that the terminal 11 is selected as the representative terminal.

(S216) The session management server 3 transmits a “representation designation request” to the representative terminal 11. The “representative designation request” includes the function type of the subordinate terminal (mobile phone 23).
(S217) Upon receiving the “representation designation request” from the session management server 3, the terminal 11 determines whether or not the terminal itself can operate as a representative terminal. At this time, the terminal 11 makes a determination based on its own CPU / memory utilization rate and packet loss rate. When it is determined that the terminal 11 can operate as a representative terminal, the terminal 11 transmits a “representative designation response (OK)” to the session management server 3.

(S218) Upon receiving the “representative designation notification (OK)” from the terminal 11, the session management server 3 transmits a “representative designation notification” to the mobile phone 23 serving as a subordinate terminal. The “representative designation notification” includes information that the representative terminal is the terminal 11.
(S 219) Upon receiving “representative designation notification” from the session management server 3, the mobile phone 23 confirms that the representative terminal is the terminal 11. The mobile phone 23 transmits “representation designation confirmation” to the session management server 3. Accordingly, the mobile phone 23 performs group communication depending on the terminal 11.

(S <b> 220) The session management server 3 transmits to the terminal 12 a “representative end notification” to the effect that the representative is ended to the terminal 12.
(S221) Upon receiving the “representative end notification”, the terminal 12 disconnects the link with the mobile phone 23.
(S222) When the link is disconnected, the terminal 12 transmits “representation completion confirmation” to the session management server 3.

(S223) The mobile phone 23 moves to the terminal 11 as a subordinate terminal.
(S224) The mobile phone 23 connects a link with the representative terminal 11. For example, the mobile phone 23 can connect the link by making a call to the representative terminal 11.
(S225) Thereby, user data of group communication can be transmitted and received between the terminal 11-terminal 12, the terminal 11-cell phone 23, and the terminal 12- (representative terminal 11) -cell phone 23. The representative terminal 12 performs media adjustment or conversion in order to transfer the user data received from the terminal 11 to the mobile phone 23.

  FIG. 4 is a functional configuration diagram of a terminal according to the present invention. Of course, these functions can also be realized by executing a program installed in the terminal.

  The terminal 1 includes a first communication interface 101, a group communication processing unit 102, a representative terminal processing unit 103, a subordinate terminal processing unit 104, a switch 105, a media adjustment unit 106, a second communication interface 107, a load A state detection unit 108.

  The first communication interface and the second communication interface are interfaces for different communication networks. For example, in the case of the terminal 12 of FIG. 1, the first communication interface is an interface that communicates with the terminal 11 via a fixed communication network, and the second communication interface is an interface that communicates with the mobile phone 23 via the mobile communication network. It is. Although FIG. 4 describes that the subordinate terminal is connected via the second communication interface, the subordinate terminal may be connected via the first communication interface. For example, it is possible to connect to a subordinate terminal via a mobile communication network via a fixed communication network. In this case, the media adjustment unit 106 described below adjusts the media format of the user data received from the first communication interface, and returns the user data to the first communication interface for transmission.

  The group communication processing unit 102 performs group communication with other terminals belonging to the group. For example, in the case of the terminal 12, group communication performed between the terminal 11 and the mobile phone 23 is managed.

  The representative terminal processing unit 103 performs processing in which the terminal itself operates as a representative terminal. The representative terminal processing unit 103 receives “representation designation request” and “representation designation end notification” from the first communication interface, and sends “representation designation response”, “representation designation switching request”, and “representation designation end confirmation” to the first communication interface. Send. In addition, when the terminal itself becomes the representative terminal, the representative terminal processing unit 103 switches the switch 105 to transfer the user data to the subordinate terminal (for example, the mobile phone 23). Further, the representative terminal processing unit 103 receives a notification from the load state detection unit 108 that the load state of the terminal itself is “overload state”. When in the “overload state”, the representative terminal processing unit 103 can determine that the terminal itself cannot function as a representative terminal.

  The load state detection unit 108 constantly monitors the CPU / memory utilization rate and the packet loss rate. When these rates reach a predetermined threshold value or more, it is determined as an “overload state” and notifies the representative terminal processing unit 103 to that effect. Further, the load state detection unit 108 transmits the load state information to the session management server 3 via the first communication interface.

  The dependent terminal processing unit 104 performs processing in which the terminal itself operates as a dependent terminal. The dependent terminal processing unit 104 receives the “representation designation notification” via the first communication interface and transmits the “representation designation confirmation” via the first communication interface.

  The media adjustment unit 106 performs media adjustment of user data between the first communication interface and the second communication interface. When the representative terminal processing unit 103 determines that the terminal itself becomes the representative terminal, the representative terminal processing unit 103 notifies the media adjustment unit 106 of media information that can be reproduced by the subordinate terminal. The media adjustment unit 106 converts or adjusts the user data received from the first communication interface based on the media information that can be reproduced by the slave terminal, and transmits the converted user data via the second communication interface 107.

  As described above, according to the present invention, group communication is continued even in a group communication system even when there is a terminal whose use communication band is significantly narrower or processing capability is lower than other members. can do. In particular, even if a mobile terminal joins a group composed of fixed terminals as a member, the mobility of service can be realized. According to the present invention, the amount of data or line delay is absorbed by the representative terminal by dynamically changing the topology so that the terminal having a narrow communication bandwidth or low processing capability is subordinated to the representative terminal.

  For example, when a video conference system is assumed as an application for group communication, fixed terminals exchange video and audio data, whereas a fixed terminal and a mobile terminal exchange only audio data. The mobile terminal can participate in group communication with at least audio data only.

  In the various embodiments of the present invention described above, various changes, modifications, and omissions in the scope of the technical idea and the viewpoint of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

It is a block diagram of the group communication system in a prior art. It is a block diagram of the group communication system in this invention. It is a sequence diagram in the present invention. It is a function block diagram of the terminal in this invention.

Explanation of symbols

1, 11, 12, 13 Fixed terminal 101 First communication interface 102 Group communication processing unit 103 Representative terminal processing unit 104 Subordinate terminal processing unit 105 Switch 106 Media adjustment unit 107 Second communication interface 108 Load state detection unit 2, 23 Mobile terminal Mobile phone 3 Session management server

Claims (10)

About a group communication system composed of a plurality of independent terminals that mutually communicate data of the first media format,
A first step of selecting any one independent terminal as a representative terminal according to a load state of the independent terminal;
A second step of subordinately connecting the representative terminal to a terminal belonging to the group as a subordinate terminal;
The representative terminal includes a third step of adjusting a media format between data of a first media format transmitted / received to / from the independent terminal and data of a second media format transmitted / received to / from the dependent terminal. A slave connection method in a group communication system.   2. The dependent connection method according to claim 1, wherein the second media type is determined according to the performance, bandwidth and / or coding scheme of the dependent terminal for the third step. The system further includes a session management server having a group management table for managing a load state for each independent terminal,
2. The first step, wherein the load state is a used communication band and / or processing capacity, and the session management server selects an independent terminal having a low load state as the representative terminal. Or the subordinate connection method of 2.   When the independent terminal operated by the user is changed to another terminal, when the other terminal has a narrower communication bandwidth and / or lower processing capacity than the independent terminal, the first to The dependent connection method according to any one of claims 1 to 3, wherein a third step is performed. In a terminal that forms a group with a plurality of terminals and communicates data of the first media format with each other,
A first communication interface for communicating with other terminals constituting the group;
Group communication processing means for performing group communication via the first communication interface;
Representative terminal processing means that functions as a representative terminal to connect other terminals belonging to the group as subordinate terminals;
A second communication interface for communicating with the subordinate terminal;
A media format is adjusted between data of a first media format transmitted / received via the first communication interface and data of a second media format transmitted / received via the second communication interface. A group communication terminal comprising media adjusting means.   6. The terminal according to claim 5, wherein the media adjustment means determines the second media type according to the performance, bandwidth and / or coding scheme of the subordinate terminal.   When the representative terminal processing means receives a representative designation request message from the session management server that manages the load state for each terminal constituting the group, the representative terminal processing unit determines whether or not to become the representative terminal according to the load state of the terminal. The terminal according to claim 5 or 6, wherein a representative terminal designation response is transmitted to the session management server. In a program for configuring a group with a plurality of terminals and causing a computer mounted on a terminal to communicate data of the first media format to each other,
A first communication interface for communicating with other terminals constituting the group;
Group communication processing means for performing group communication via the first communication interface;
Representative terminal processing means that functions as a representative terminal to connect other terminals belonging to the group as subordinate terminals;
A second communication interface for communicating with the subordinate terminal;
A media format is adjusted between data of a first media format transmitted / received via the first communication interface and data of a second media format transmitted / received via the second communication interface. A program for causing a computer to function as media adjusting means.   The said media adjustment means makes a computer function so that a said 2nd media format may be determined according to the performance of the said subordinate terminal, a zone | band, and / or an encoding system, The function of Claim 8 characterized by the above-mentioned. program. When the representative terminal processing means receives a representative designation request message from the session management server that manages the load state for each terminal constituting the group, the representative terminal processing unit determines whether or not to become the representative terminal according to the load state of the terminal. The program according to claim 8 or 9, wherein the computer is caused to function so as to transmit a representative terminal designation response to the session management server.

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