KR102637942B1 - MCPTT(Mission Critical Push To Talk) SERVER, METHOD AND COMPUTER PROGRAM FOR PROVIDING eMBMS SERVICE - Google Patents

Abstract

The MCPTT (Mission Critical Push To Talk) server that provides the eMBMS service is a receiver that receives a group call request message from the user terminal, including talk group information and session expiration value for the talk group including the user terminal, and sends the talk group information to the receiver. Based on the group determination unit that determines which group of the eMBMS talk group and the general MCPTT talk group the user terminal is included in, and the type of talk group in which the user terminal is included, a response message including whether the session expiration value has been changed is sent to the user. It may include a transmission unit that transmits to the terminal.

Description

Mission Critical Push To Talk (MCPTT) server, method, and computer program for providing eMBMS service {MCPTT (Mission Critical Push To Talk) SERVER, METHOD AND COMPUTER PROGRAM FOR PROVIDING eMBMS SERVICE}

The present invention relates to an MCPTT server, method, and computer program that provides eMBMS services.

Unlike the unicast method, which requires allocating base station resources for each user, eMBMS is a communication method that utilizes the multicast method and is a technology that can transmit the same data to an unspecified number of users through the LTE network. eMBMS is a technology that allows multiple users to use the same resources at the same time by allocating a portion of the base station's downlink resources like a broadcast channel, enabling services to be provided to multiple users without network load and increasing network efficiency. According to these characteristics of eMBMS, eMBMS was introduced into the public safety net.

Previously, MCPTT (Mission Critical Push to Talk) service, a group communication service, was used in the public safety network.

The MCPTT service is a group communication service that is controlled so that only authorized users within the group can transmit voice or video data, and the remaining users in the call group can only receive the voice or video data.

Using these characteristics, it is efficient in terms of resource efficiency to transmit downlink data through a broadcast channel, and the MCPTT service can have hundreds to thousands of users, and users are likely to be located close to each other. Considering that transmitting the downlink data of the MCPTT service through eMBMS increases the efficiency of base station resource use and prepares for surge in disaster situations, eMBMS was introduced in the public safety communication network.

The reason why eMBMS was introduced as a solution to counteract congestion in the MCPTT service is that the terminal can receive eMBMS-based downlink data even when the terminal is not connected to the base station (RRC Idle state).

When multiple terminals exceeding the capacity of the base station are gathered within the same cell coverage, the receiving terminal receives voice and video data in RRC Idle state, so the terminals that the base station must manage are only one sending terminal for each MCPTT call group. .

In such a congestion situation, the most important thing is to minimize the number of connected terminals connecting to the base station by providing MCPTT service through eMBMS so that terminals can receive the service even in RRC Idle state.

Meanwhile, the MCPTT service follows the SIP (Session Initiation Protocol) protocol. In the case of the SIP protocol, the Session Refresh function was introduced in IETF RFC 4028 as a keepalive check for the session.

When initiating a call, the terminal sends a Session Update message before the agreed-upon Session Expire time expires to inform the user that there is no problem with the current session and maintain the session.

IETF standard RFC 4028 defines Min-SE value and 422 response code (Session Interval Too Small) in addition to session expiration value.

IETF standard RFC 4028 defines the minimum value for session expiration as the Min-SE value, and if the terminal attempts to negotiate with a value lower than this, the terminal sets the session expiration value to the Min-SE value through a 422 response code (Session Interval Too Small). Please edit and upload.

Figure 1a shows the negotiation process for a session timer and the process for session refresh when a terminal initiates a call.

Referring to FIG. 1A, in step S101, the first user terminal 10 makes a first call connection with a session expiration value of '50' to the first proxy server 20 to initiate a call of the talk group. A request message can be sent.

In step S103, when negotiation is required for the session expiration value included in the first call connection request message, the first proxy server 20 sends 422 containing the Min-SE value '3600', which means the minimum value for session expiration. A response code message may be transmitted to the first user terminal 10.

In step S105, the first user terminal 10 transmits an ACK message for the 422 response code message received from the first proxy server 20 to the first proxy server 20, and in step S107, the first user terminal 10 ) modifies the session expiration value to '3600', which is the Min-SE value, and sends a second call connection request message containing the modified session expiration value '3600' and Min-SE value '3600' to the first proxy server (20) ) can be sent to.

In step S109, the first proxy server 20 may transmit the second call connection request message received from the first user terminal 10 to the second proxy server 30.

In step S111, when negotiation is required for the session expiration value included in the second call connection request message, the second proxy server 30 sends a 422 response code message including Min-SE value '4000' to the first proxy server. It can be sent to (20).

In step S113, the first proxy server 20 transmits an ACK message for the 422 response code message received from the second proxy server 30 to the second proxy server 30, and in step S115, the first user terminal 10 ), you can send a 422 response code message containing the Min-SE value '4000'.

In step S117, the first user terminal 10 transmits an ACK message for the 422 response code message to the first proxy server 20, and in step S119, the first user terminal 10 sets the session expiration value to Min-SE. The value may be modified to '4000', and a third call connection request message including the modified session expiration value '4000' and Min-SE value '4000' may be transmitted to the first proxy server 20.

In step S121, the first proxy server 20 may transmit the third call connection request message received from the first user terminal 10 to the second proxy server 30.

In step S123, the second proxy server 30 may deliver a third call connection request message to the second user terminal 40.

In step S125, the second proxy server 30 receives a 200 OK message including a session expiration value of '4000' from the second user terminal 40, and in step S127, the second proxy server 30 receives the first proxy server The 200 OK message is delivered to 20, and the first proxy server 20 may deliver the 200 OK message to the first user terminal 10 in step S129.

In step S131, the first user terminal 10 transmits an ACK message for the received 200 OK message to the first proxy server 20, and in step S133, the first proxy server 20 sends the second user terminal 40 The received ACK message can be delivered to.

In step S135, the first user terminal 10 transmits a session update message to the first proxy server 20 before the agreed upon session expiration value '4000' expires, and in step S137, the first proxy server 20 2 The received session update message can be delivered to the user terminal 40.

In step S139, the first proxy server 20 may receive a 200 OK message for the session update message from the second user terminal 40.

Meanwhile, Figure 1b is a diagram showing the session update process during MCPTT service. Referring to FIG. 1B, when the user terminal 50, which initiated the call before the session expiration value expires, transmits a session update message to the MCPTT server 60, the MCPTT server 60 sends a 200 ok message to the user terminal 50. The message is transmitted, the session update message is simultaneously delivered to all terminals 70 in the talk group to which the user terminal 50 belongs, and the terminals 70 that received the session update message send the MCPTT server 60 with a 200 OK message. respond to

The session update message or 200 OK message used in the session refresh process of the MCPTT service is delivered through unicast method, not multicast method.

If a session refresh process is performed while some terminals are receiving MCPTT voice data and video data through the eMBMS channel while maintaining the RRC Idle state, the terminals belonging to the talk group simultaneously transmit an RRC connection request message to the base station, and a plurality of terminals Overload occurs at the base station that receives the RRC connection request message.

If an overload occurs at the base station, the terminal may not receive the session update message transmitted by the MCPTT server 60 in the downlink, and the 200 OK message transmitted by the terminal in the uplink may be lost.

If session refresh-related messages are lost, the terminal or MCPTT server transmits a BYE message and deletes the session.

The IETF standard RFC 4028 selects the session expiration value based on network factors such as application scenarios and server memory availability, and sets 30 minutes as the recommended session expiration value because 95% of phone calls are shorter than 30 minutes.

Korean Patent Publication No. 10-1996569 (registered on June 28, 2019)

Since eMBMS used in call congestion scenarios (e.g., disaster situations, large-scale gatherings, etc.) has different scenarios from MCPTT used in general situations, the present invention uses call group information included in the group call request message received from the user terminal. We want to determine which group the user terminal belongs to, the eMBMS talk group or the general MCPTT talk group, and send a response message including whether the session expiration value has been changed according to the decision result to the user terminal that initiated the call.

However, the technical challenges that this embodiment aims to achieve are not limited to the technical challenges described above, and other technical challenges may exist.

As a technical means for achieving the above-described technical problem, an MCPTT (Mission Critical Push To Talk) server that provides an eMBMS service according to the first aspect of the present invention transmits a call group from a user terminal to a call group including the user terminal. a receiving unit that receives a group call request message including information and a session expiration value; a group determination unit that determines which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal based on the talk group information; and a transmission unit that transmits to the user terminal a response message including whether the session expiration value has been changed based on the type of talk group in which the user terminal is included.

A method of providing an eMBMS service performed by an MCPTT server according to the second aspect of the present invention includes receiving a group call request message including talk group information and session expiration value for a talk group including the user terminal from a user terminal. steps; Determining which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal based on the talk group information; and transmitting to the user terminal a response message including whether the session expiration value has been changed based on the type of talk group in which the user terminal is included.

A computer program stored in a computer-readable recording medium including a sequence of instructions for providing an eMBMS service according to the third aspect of the present invention, when executed by a computing device, allows a call to be made from a user terminal to a talk group including the user terminal. Receive a group call request message including group information and session expiration value, determine which group of the eMBMS call group and general MCPTT call group includes the user terminal based on the talk group information, and determine which group the user terminal is included in. It may include a sequence of commands for transmitting a response message including whether to change the session expiration value to the user terminal based on the type of talk group being used.

The above-described means for solving the problem are merely illustrative and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description of the invention.

According to one of the above-described means of solving the problem of the present invention, the eMBMS used in a surge scenario (e.g., disaster situation, large-scale gathering, etc.) has a different scenario from the MCPTT used in a general situation, so the present invention provides a method for receiving data from a user terminal. Based on the talk group information included in the group call request message, the user terminal determines which group it belongs to, the eMBMS talk group or the general MCPTT talk group, and sends a response message including whether to change the session expiration value according to the decision result. It can be transmitted to the user terminal.

Through this, the present invention can smoothly provide an eMBMS-based group communication service without overloading the base station in a congestion situation.

In addition, the present invention manages the Min-SE value of each eMBMS talk group and general MCPTT talk group, thereby preventing base station overload caused by the session refresh process in the terminal when a large-scale gathering or disaster situation occurs.

In addition, the present invention can smoothly provide group communication services for the number of terminals exceeding the base station capacity in a limited frequency bandwidth environment in a public safety communication network.

1A to 1B are diagrams for explaining a method of providing a conventional eMBMS service.
Figure 2 is a block diagram of an MCPTT server, according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a method of changing a session expiration value according to identification information about a talk group, according to an embodiment of the present invention.
Figure 4 is a flowchart showing a method of providing eMBMS service according to an embodiment of the present invention.
Figure 5 is a flowchart showing a method of providing eMBMS service according to another embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected," but also the case where it is "electrically connected" with another element in between. . Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

In this specification, 'part' includes a unit realized by hardware, a unit realized by software, and a unit realized using both. Additionally, one unit may be realized using two or more pieces of hardware, and two or more units may be realized using one piece of hardware.

In this specification, some of the operations or functions described as being performed by a terminal or device may instead be performed on a server connected to the terminal or device. Likewise, some of the operations or functions described as being performed by the server may also be performed on a terminal or device connected to the server.

Hereinafter, specific details for implementing the present invention will be described with reference to the attached configuration diagram or processing flow diagram.

Figure 2 is a block diagram of the MCPTT server 20, according to one embodiment of the present invention.

Referring to FIG. 2, the MCPTT server 20 may include a Min-SE value setting unit 200, a receiving unit 210, a group determining unit 220, and a transmitting unit 230. However, the MCPTT server 20 shown in FIG. 2 is only one implementation example of the present invention, and various modifications are possible based on the components shown in FIG. 2.

Hereinafter, FIG. 2 will be described with reference to FIG. 3.

The eMBMS of the present invention basically supports all frame structures such as TDD/FDD, and can allocate radio resources by freely switching between unicast and broadcast methods depending on demand such as specific time zone and service type. Of the total wireless resources, up to 60% for FDD and 50% for TDD can be allocated for eMBMS.

The eMBMS service used in flood scenarios, such as disaster situations or large-scale gatherings, has a different scenario from the MCPTT service used in general situations.

To distinguish this, the Min-SE value setting unit 200 may set the session expiration value of the eMBMS service that services the number of terminals exceeding the base station capacity to be different from the session expiration value of the MCPTT service.

Specifically, the Min-SE value setting unit 200 may set the first Min-SE value for the eMBMS talk group and the second Min-SE value for the general MCPTT talk group.

For example, referring to FIG. 3, the Min-SE value setting unit 200 may set the first Min-SE value for the eMBMS talk group to '10 hours' as the minimum value for the session expiration value of the eMBMS talk group. there is. Additionally, the Min-SE value setting unit 200 may set the second Min-SE value for the general MCPTT talk group to '1 hour' as the minimum value for the session expiration value of the general MCPTT talk group.

The receiving unit 210 may receive a group call request message from the user terminal 300 including talk group information and session expiration value for the talk group including the user terminal. Here, the user terminal 300 may be a command terminal or a general wireless terminal. For example, if the user terminal 300 is a command terminal, the command terminal creates a talk group, the host who first initiates the voice call or video call may be the command terminal, and a general wireless terminal belonging to the talk group may be It can be.

Here, the talk group information may include one of identification information for an eMBMS talk group and identification information for a general MCPTT talk group. Here, the identification information for the eMBMS talk group includes MCPTT group document information, and the MCPTT group document information includes, for example, a 'require-multicast-floor-control-signaling' value or a 'MBMS-service-area' value, etc. It can be included.

For example, referring to FIG. 3, the receiver 210 receives a session expiration value (e.g., 1 hour) set as default from the user terminal 300 that first initiates a group call to the talk group, and the user terminal 300 A group call request message containing talk group information about the talk group to which it belongs can be received.

The group determination unit 220 may determine which group of the eMBMS talk group 320 and the general MCPTT talk group 310 includes the user terminal 300 based on talk group information.

For example, referring to FIG. 3, the group determination unit 220 searches the MCPTT group document information included in the talk group information and determines whether the user terminal 300 is connected to the eMBMS talk group 320 and the general MCPTT talk group 310. You can determine which group you belong to.

For example, if the MCPTT group document information of the talk group information includes a 'require-multicast-floor-control-signaling' value or a 'MBMS-service-area' value, the group determination unit 220 determines the user terminal 300. ) can be determined to be included in the eMBMS talk group 320.

The transmission unit 230 sends a response message including whether the session expiration value included in the group call request message of the user terminal 300 has been changed based on the type of talk group in which the user terminal 300 is included. ) can be sent to.

When the user terminal 300 is included in the eMBMS talk group, the transmission unit 230 compares the session expiration value included in the group call request message of the user terminal 300 and the first Min-SE value for the eMBMS talk group. Based on the results, a response message including whether the session expiration value has been changed may be transmitted to the user terminal 300.

If the session expiration value included in the group call request message of the user terminal 300 is greater than or equal to the first Min-SE value for the eMBMS talk group, the transmission unit 230 sends a response message (200 OK message) to maintain the session expiration value. ) can be transmitted to the user terminal 300.

If the session expiration value included in the group call request message of the user terminal 300 is greater than or equal to the first Min-SE value for the eMBMS talk group, the transmission unit 230 sends all terminals in the eMBMS talk group to which the user terminal 300 belongs. A group call request message containing the session expiration value can be sent to the user.

If the session expiration value included in the group call request message of the user terminal 300 is less than the first Min-SE value for the eMBMS talk group, the transmission unit 230 changes the session expiration value to the first Min-SE value. A response message may be transmitted to the user terminal 300.

For example, referring to FIG. 3, the user terminal 300 is a terminal belonging to the eMBMS call group 320, and the session expiration value included in the first group call request message of the user terminal 300 is '1 hour'. And, when the 1st Min-SE value for the eMBMS talk group 320 is '10 hours', the session expiration value is less than the 1st Min-SE value, so the transmission unit 230 sets the session expiration value to the 1st Min-SE value. A 422 response code message that changes the SE value to '10 hours' can be transmitted to the user terminal 300.

Thereafter, when the user terminal 300 receives a 422 response code message to change the session expiration value to the first Min-SE value ('10 hours'), it changes the session expiration value to the first Min-SE value according to RFC 4028. The second group call request message including the changed session expiration value of '10 hours' can be retransmitted to the MCPTT server 20.

Thereafter, before the session expiration value '10 hours' expires, the transmission unit 230 may transmit a second group call request message containing the session expiration value to all terminals in the eMBMS talk group to which the user terminal 300 belongs. .

Returning to FIG. 2, when the user terminal 300 is included in the general MCPTT talk group, the transmitter 230 transmits the session expiration value included in the group call request message of the user terminal 300 and the general MCPTT talk group. A response message may be transmitted to the user terminal 300 based on the comparison result between the second Min-SE values.

If the session expiration value included in the group call request message of the user terminal 300 is greater than or equal to the second Min-SE value for the general MCPTT talk group, the transmission unit 230 sends a response message (200 OK) to maintain the session expiration value. message) can be transmitted to the user terminal 300.

For example, referring to FIG. 3, the user terminal 300 is a terminal belonging to the general MCPTT talk group 310, and the session expiration value included in the group call request message of the user terminal 300 is '1 hour'. , if the second Min-SE value for the general MCPTT talk group 310 is '1 hour', the transmission unit 230 sends a response message (200 OK message) to the user to maintain the session expiration value '1 hour'. It can be transmitted to the terminal 300.

Thereafter, if the session expiration value included in the group call request message of the user terminal 300 is greater than or equal to the 2nd Min-SE value for the general MCPTT talk group, the transmission unit 230 before the session expiration value '1 hour' expires. Can transmit a group call request message containing the corresponding session expiration value to all terminals in the general MCPTT talk group to which the user terminal 300 belongs.

If the session expiration value included in the group call request message of the user terminal 300 is less than the 2nd Min-SE value for the general MCPTT talk group, the transmitter 230 changes the session expiration value to the 2nd Min-SE value. A response message (422 response code message) to do so may be transmitted to the user terminal 300.

When the user terminal 300 receives a response message to change the session expiration value to the second Min-SE value, it changes the session expiration value to the second Min-SE value according to RFC 4028 and requests grouping including the changed session expiration value. The message can be retransmitted to the MCPTT server 20.

Meanwhile, for those skilled in the art, the Min-SE value setting unit 200, the receiving unit 210, the group determination unit 220, and the transmitting unit 230 may each be implemented separately, or one or more of them may be integrated and implemented. You will fully understand.

Figure 4 is a flowchart showing a method of providing eMBMS service according to an embodiment of the present invention.

Referring to FIG. 4, in step S401, the first MCPTT server 20-1 receives a default session expiration value (e.g., 90) and a user terminal ( A first group call request message containing talk group information about the talk group to which 300) belongs may be received.

In step S403, the first MCPTT server 20-1 determines which group of the eMBMS talk group and the general MCPTT talk group the user terminal 300 belongs to based on the talk group information included in the first group call request message. You can. In addition, when the first MCPTT server 20-1 determines that the user terminal 300 is a terminal belonging to an eMBMS call group, the session expiration value included in the group call request message of the user terminal 300 and the first MCPTT server ( A response message including whether the session expiration value has been changed can be transmitted to the user terminal 300 through the comparison result between the first Min-SE value (e.g., 1200) for the eMBMS talk group set by 20-1). Specifically, when the session expiration value included in the first group call request message of the user terminal 300 is less than the first Min-SE value for the eMBMS talk group, the first MCPTT server 20-1 sets the session expiration value. A 422 response code message to change the value to the first Min-SE value may be transmitted to the user terminal 300.

In step S405, the user terminal 300 changes the existing session expiration value to the first Min-SE value according to the received 422 response code message, and sends the first Min-SE value including the changed session expiration value (e.g., 1200) and talk group information. 2 The group call request message can be retransmitted to the first MCPTT server (20-1).

In step S407, the first MCPTT server 20-1 may transmit the second group call request message received from the user terminal 300 to the second MCPTT server 20-3.

In step S409, the second MCPTT server 20-3 determines that the user terminal 300 is a terminal belonging to the eMBMS call group based on the talk group information included in the received second group call request message, and the user terminal 300 ) of the session expiration value (e.g., 1200) included in the second group call request message and the first Min-SE value (e.g., 1800) for the eMBMS talkgroup set by the second MCPTT server 20-3. Through the results, a response message including whether the session expiration value has been changed can be transmitted to the first MCPTT server 20-1. Specifically, if the session expiration value included in the second group call request message of the user terminal 300 is less than the first Min-SE value for the eMBMS talk group, the second MCPTT server 20-3 sets the session expiration value. A 422 response code message to change to the first Min-SE value may be transmitted to the first MCPTT server 20-1.

In step S411, the first MCPTT server 20-1 sends a 422 response code message to the user terminal 300 to change the session expiration value received from the second MCPTT server 20-3 to the first Min-SE value. It can be delivered.

In step S413, the user terminal 300 changes the session expiration value to the first Min-SE value according to the received 422 response code message, and sets the third group including the changed session expiration value (e.g., 1800) and talk group information. The call request message can be retransmitted to the first MCPTT server (20-1).

In step S415, the first MCPTT server 20-1 may deliver a third group call request message to the second MCPTT server 20-3.

In step S417, the second MCPTT server 20-3 sends a message containing a changed session expiration value (e.g., 1800) and call group information to a plurality of terminals included in the eMBMS talk group 320 to which the user terminal 300 belongs. 3 A group call request message can be sent.

In step S419, a plurality of terminals included in the eMBMS call group 320 update the existing default session expiration value (e.g., 90) to '1800' based on the session expiration value included in the received third group call request message. can do.

In the above description, steps S401 to S419 may be further divided into additional steps or combined into fewer steps, depending on the implementation of the present invention. Additionally, some steps may be omitted or the order between steps may be changed as needed.

Figure 5 is a flowchart showing a method of providing eMBMS service according to another embodiment of the present invention.

Referring to FIG. 5, in step S501, the MCPTT server 20 may receive a group call request message from the user terminal including talk group information and session expiration value for the talk group including the user terminal.

In step S503, the MCPTT server 20 may determine which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal based on talk group information. Here, the talk group information may include one of identification information for an eMBMS talk group and identification information for a general MCPTT talk group.

In step S505, the MCPTT server 20 may transmit a response message including whether to change the session expiration value to the user terminal based on the type of talk group in which the user terminal is included.

In the above description, steps S501 to S605 may be further divided into additional steps or combined into fewer steps, depending on the implementation of the present invention. Additionally, some steps may be omitted or the order between steps may be changed as needed.

One embodiment of the present invention may also be implemented in the form of a recording medium containing instructions executable by a computer, such as program modules executed by a computer. Computer-readable media can be any available media that can be accessed by a computer and includes both volatile and non-volatile media, removable and non-removable media. Additionally, computer-readable media may include all computer storage media. Computer storage media includes both volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

20: MCPTT server.
200: Min-SE value setting unit
210: receiving unit
220: Group judgment unit
230: Transmission unit

Claims (19)

In the MCPTT (Mission Critical Push To Talk) server that provides eMBMS service,
a receiving unit that receives a group call request message including talk group information and a session expiration value for a talk group including the user terminal from a user terminal;
a group determination unit that determines which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal based on the talk group information; and
A transmission unit that transmits a response message including whether the session expiration value has changed based on the type of talk group in which the user terminal is included to the user terminal.
Including,
Further comprising a Min-SE value setting unit that sets a first Min-SE value for the eMBMS talk group and a second Min-SE value for the general MCPTT talk group,
Determining whether to change the session expiration value based on a comparison result between the session expiration value and a value corresponding to the type of talk group in which the user terminal is included among the first Min-SE value and the second Min-SE value. That's it, MCPTT server.
According to claim 1,
The talk group information includes one of identification information for the eMBMS talk group and identification information for the general MCPTT talk group.
delete According to claim 1,
The transmission unit
When the user terminal is included in the eMBMS talk group, the MCPTT server transmits the response message to the user terminal based on a comparison result between the session expiration value and the first Min-SE value.
According to claim 4,
The transmission unit
When the session expiration value is greater than or equal to the first Min-SE value, the MCPTT server transmits a response message to maintain the session expiration value to the user terminal.
According to claim 4,
The transmission unit
When the session expiration value is less than the first Min-SE value, the MCPTT server transmits a response message to change the session expiration value to the first Min-SE value to the user terminal.
According to claim 1,
The transmission unit
When the user terminal is included in the general MCPTT talk group, the MCPTT server transmits the response message to the user terminal based on a comparison result between the session expiration value and the second Min-SE value.
According to claim 7,
The transmission unit
When the session expiration value is greater than or equal to the second Min-SE value, the MCPTT server transmits a response message to maintain the session expiration value to the user terminal.
According to claim 7,
The transmission unit
When the session expiration value is less than the second Min-SE value, the MCPTT server transmits a response message to change the session expiration value to the second Min-SE value to the user terminal.
In a method of providing eMBMS service performed by an MCPTT server,
Receiving a group call request message from a user terminal including talk group information and a session expiration value for a talk group including the user terminal;
Determining which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal based on the talk group information; and
Transmitting a response message including whether to change the session expiration value to the user terminal based on the type of talk group in which the user terminal is included.
Including,
Further comprising setting a first Min-SE value for the eMBMS talkgroup and a second Min-SE value for the general MCPTT talkgroup,
Determining whether to change the session expiration value based on a comparison result between the session expiration value and a value corresponding to the type of talk group in which the user terminal is included among the first Min-SE value and the second Min-SE value. How to provide eMBMS service.
According to claim 10,
Wherein the talk group information includes one of identification information for the eMBMS talk group and identification information for the general MCPTT talk group.
delete According to claim 10,
The step of transmitting the response message to the user terminal is
When the user terminal is included in the eMBMS talk group, transmitting the response message to the user terminal based on a comparison result between the session expiration value and the first Min-SE value.
A method of providing eMBMS service, including.
According to claim 13,
The step of transmitting the response message to the user terminal is
If the session expiration value is greater than or equal to the first Min-SE value, transmitting a response message to maintain the session expiration value to the user terminal.
A method of providing eMBMS service, including.
According to claim 13,
The step of transmitting the response message to the user terminal is
If the session expiration value is less than the first Min-SE value, transmitting a response message to change the session expiration value to the first Min-SE value to the user terminal.
A method of providing eMBMS service, including.
According to claim 10,
The step of transmitting the response message to the user terminal is
When the user terminal is included in the general MCPTT talk group, transmitting the response message to the user terminal based on a comparison result between the session expiration value and the second Min-SE value.
A method of providing eMBMS service, including.
According to claim 16,
The step of transmitting the response message to the user terminal is
If the session expiration value is greater than or equal to the second Min-SE value, transmitting a response message to maintain the session expiration value to the user terminal.
A method of providing eMBMS service, including.
According to claim 17,
The step of transmitting the response message to the user terminal is
If the session expiration value is less than the second Min-SE value, transmitting a response message to change the session expiration value to the second Min-SE value to the user terminal.
A method of providing eMBMS service, including.
A computer program stored on a computer-readable recording medium containing a sequence of instructions providing an eMBMS service, comprising:
When the computer program is executed by a computing device,
Receiving a group call request message from a user terminal including talk group information and session expiration value for the talk group including the user terminal,
Based on the talk group information, determine which group of the eMBMS talk group and the general MCPTT talk group includes the user terminal,
Transmitting a response message including whether to change the session expiration value to the user terminal based on the type of talk group in which the user terminal is included,
Setting a first Min-SE value for the eMBMS talk group and a second Min-SE value for the general MCPTT talk group,
Determining whether to change the session expiration value based on a comparison result between the session expiration value and a value corresponding to the type of talk group in which the user terminal is included among the first Min-SE value and the second Min-SE value. A computer program stored on a computer-readable recording medium containing a sequence of instructions.

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