KR101892269B1 - Method and terminal for providing MCPTT service - Google Patents

Abstract

The terminal, which is one of the terminals performing D2D communication according to the MCPTT service, transmits a discovery announcement message including at least one of the category of the terminal, the video performance of the camera provided in the terminal, and the status information of the terminal, A method of receiving an MCPTT service by receiving a discovery announcement message of another terminal included in terminals performing communication and acquiring information on the existence and performance of another terminal based on the received discovery announcement message is disclosed .

Description

[0001] The present invention relates to a method and a terminal for providing a Mission Critical Push To Talk (MCPTT)

The disclosed embodiments relate to a method of providing an MCPTT service, a terminal providing an MCPTT service, and a computer-readable recording medium recording a program for executing a method of providing an MCPTT service.

Recently, interest in public safety nets that can provide communication services in emergency situations such as disaster situation is increasing. In the case of the special-purpose dedicated communication service, communication can be performed based on a service such as a push-to-talk (PTT). In the case of the PTT-based communication service, only the terminal that has acquired the voice can speak (for example, media transmission).

On the other hand, in the case of a public safety network, a network resource such as a server may not be supported, and a situation in an off network in which a central controller does not exist should be considered. In the case of the public safety net, direct communication between terminals should be considered.

Accordingly, in order to implement a PTT-based communication service in an off-network, it is necessary to research and develop a process capable of controlling communication-enabled terminals, communication-related parameter announcement and setting, and the like.

The disclosed embodiment provides an MCPTT service for communicating with at least one other terminal in an off-network situation, for notifying information about the communication or for searching for another communicable terminal for searching at least one other terminal And a terminal.

The disclosed embodiments also provide a method and terminal for providing a MCPTT service for setting a parameter necessary for establishing communication with a terminal or sharing a set parameter in an off-network situation.

A method of providing a Mission Critical Push To Talk (MCPTT) service according to an exemplary embodiment is a method in which a terminal, which is one of terminals performing D2D communication according to an MCPTT service, Transmitting a discovery announcement message including at least one of video capability and status information of the terminal; Receiving a discovery announcement message of another terminal included in terminals performing D2D communication; And acquiring information on the existence and performance of another terminal based on the received discovery announcement message.

A method of providing a MCPTT service according to an exemplary embodiment of the present invention is a method of providing a MCPTT service in which a backoff time for transmission of a discovery announcement message is set to a predetermined value and a reception frequency of a discovery announcement message of another terminal received before transmission of a discovery announcement message Wherein the step of transmitting a discovery announcement message may send a discarker announcement message after a determined back-off time.

A method of providing a MCPTT service by a terminal according to an exemplary embodiment includes: broadcasting a search message to search for another terminal capable of communicating with the terminal; Receiving a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message; And acquiring information on the existence and performance of another terminal based on the discovery announcement message received in response to the search message.

A method of providing a MCPTT service in a terminal according to an exemplary embodiment of the present invention is characterized in that the discovery announcement message of another terminal capable of communicating with the terminal includes a predetermined value of another terminal capable of communicating with the terminal and a reception frequency of a previously received discovery notice message May be received after a determined back-off time based on at least one.

A method of providing a MCPTT service by a terminal according to an exemplary embodiment includes: unicasting a search message to another terminal capable of communicating with the terminal; Receiving a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message; And acquiring information on the existence and performance of another terminal based on the discovery announcement message received in response to the search message.

A method of providing a MCPTT service by a terminal according to an exemplary embodiment includes transmitting a group communication search message for confirming whether or not group communication of at least some terminals included in the same group as the terminal is performed; Establishing a media plane based on the group communication announcement message received in response to the group communication discovery message; And performing group communication with at least some terminals according to the set media plane.

A method of providing a MCPTT service by a terminal according to an exemplary embodiment includes: transmitting a group communication notification message of a terminal when an ongoing group communication does not exist; And receiving a group communication notification message of another terminal that has set a media plane when a media plane according to a group communication notification message transmitted to another terminal that has received the group communication notification message of the terminal is set.

In a method of providing a MCPTT service by a terminal according to an exemplary embodiment, a group communication notification message of another terminal may include at least one of a predetermined value of another terminal for which a media plane is set and a reception frequency of a previously received discovery notice message May be received after the determined back-off time has elapsed.

The method of providing a MCPTT service according to an exemplary embodiment of the present invention further includes transmitting a group communication notification message including updated information when the information of the terminal is updated, The setting of the media plane of the group communication can be changed.

A terminal for providing an MCPTT service according to an exemplary embodiment includes a communication unit for transmitting and receiving a message according to an MCPTT service; And a terminal that performs D2D communication according to an MCPTT service transmits a discovery announcement message including at least one of a category of a terminal, a video capability of a camera provided in the terminal, and status information of the terminal, A processor for controlling the communication unit to receive a discovery announcement message of another terminal included in terminals performing D2D communication and acquiring information on the existence and performance of another terminal based on the received discovery announcement message .

1 is a conceptual diagram illustrating a method of providing a MCPTT service by a terminal according to an exemplary embodiment of the present invention.
2 is a flowchart illustrating a method of providing a MCPTT service by a terminal according to an exemplary embodiment of the present invention.
3 is a flowchart illustrating a method of periodically transmitting a discovery announcement message between a plurality of terminals according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method for setting a back-off time for transmitting a discovery announcement message by a plurality of terminals according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a method of searching for another terminal capable of communicating with a plurality of terminals according to an exemplary embodiment.
6 is a flowchart illustrating a method for determining a back-off time for transmitting a discovery announcement message upon receiving a search message according to an exemplary embodiment of the present invention.
7 is a flowchart illustrating a method for a terminal to broadcast a search message to search for a specific terminal according to an exemplary embodiment of the present invention.
8 is a flowchart illustrating a method for a terminal to unicast a search message and search for a specific terminal according to an embodiment.
9 is a flowchart illustrating a method for a terminal to search for another terminal in group communication according to an embodiment of the present invention.
10 is a flowchart illustrating a method of setting up a group communication by a terminal according to an exemplary embodiment.
11 is a flowchart illustrating a method of setting back-off in a group communication according to an exemplary embodiment of the present invention.
12 is a flowchart illustrating a method of manually participating in MCVideo group communication according to an embodiment of the present invention.
13 is a flowchart illustrating a method of actively participating in MCVideo group communication according to an embodiment of the present invention.
14 is a flowchart illustrating a method of updating a MCVideo group communication according to an embodiment of the present invention.
15 is a block diagram illustrating a terminal according to an embodiment.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

1 is a conceptual diagram for explaining a method by which a terminal (for example, 10) provides an MCPTT service according to an embodiment.

Referring to FIG. 1, a terminal (e.g., 10) according to an embodiment may include a Mission Critical Push To Talk (MCPTT) in an LTE-based public safety network named Public Safety LTE ) Service. The public safety network can provide a protocol so that communication can be smoothly carried out to a group to promote public safety of police, firefighters, etc. in a disaster situation such as fire, war, natural disaster and the like.

In this specification, MCVideo represents a service for mission critical video communication using an LTE telephony network. Mission Critical can refer to the needs of agencies providing public safety services such as light vehicles, firefighters and ambulance services.

There are various types of networks in which the MCPTT service is provided. For example, in the case of an on-network of the first type, as in the case of a cellular phone, a user can speak through the support of a network infrastructure such as a server. According to another example, in the case of an off-network of the second type, the user of the terminal (for example, 10) can speak directly without using the network infrastructure. That is, in the case of the off-network, a user of the terminal 100 can perform a speech according to a predetermined rule without an arbiter for controlling communication such as accepting a voice, unlike an on-network. Thus, the off-network can be used for communication between users in a situation where the network infrastructure is not equipped or in a special situation where the network infrastructure can not be supported.

For the MNC (Mission Critical Video) service of the off-network type, (e. G., 10) must determine the multimedia parameters prior to performing the group communication and share the determined multimedia parameters with the other terminals. Here, the multimedia parameters may include an audio / video codec, a multimedia port, an encoding key, a video resolution, a frame rate, and the like, but this is merely an example, and the multimedia parameters are not limited to the above examples.

A terminal according to an exemplary embodiment may perform processes such as discovery or probe before performing communication to share multimedia parameters and terminal performance with other terminals. To perform the MCVideo service, the terminal (e.g., 10) may wait for a discovery announcement message or a group communication announcement message to be received from at least one other terminal (e.g., 20 or 30) have. The group communication announcement message includes a group identifier, an identifier of the group call originator, a media type, a media codec, a bandwidth, a multicast port number for media, a video resolution, a video frame rate, a port number for a floor control protocol, Key and a confirm mode indicator. ≪ RTI ID = 0.0 > [0031] < / RTI >

The at least one media parameter described above may be used for MCVideo group communication. Upon receiving the group communication announcement message, the terminal (e.g., 10) may set its media parameters according to the received media parameters and participate in a known MCVideo group communication.

In this embodiment, a message generated from a terminal (e.g., 10) may be sent to another terminal (e.g., 20 or 20) located within the coverage of the terminal (e.g., 10) 30 may be multicast or broadcast for receipt. However, this is only an embodiment, and the terminal (for example, 10) may unicast the generated message.

A terminal (e.g., 10) according to an embodiment may announce communications or perform communications with other terminals (e.g., 20 or 30) to perform communications with another terminal (e.g., 20 or 30) And a method of setting media parameters will be described later in detail with reference to FIG. 2 to FIG.

2 is a flowchart illustrating a method of providing a MCPTT service by a terminal according to an exemplary embodiment of the present invention.

In step S210, the terminal transmits a discovery announcement message including at least one of the category of the terminal, the video capability of the camera provided in the terminal, and the status information of the terminal. Here, the terminal may be any one of terminals performing 1: N D2D communication according to the MCPTT service.

A terminal according to an exemplary embodiment may periodically transmit a discovery announcement message. The discovery announcement message may include other information related to performance information and performance information of the terminal. For example, the discovery announcement message may include the category of the terminal, the video performance of the camera, the status information of the terminal, and the like. Here, the category of the terminal may include a dragon, a smart phone, a camera, and the like, but this is only an example, and the category of the terminal is not limited to the above example. In addition, the state of the terminal may include a state such as video reception, video transmission, or video recording, but this is only an example, and the state of the terminal is not limited to the above example.

Meanwhile, another terminal receiving the discovery announcement message from the terminal can confirm presence of the terminal and store the discovery announcement message through the discovery announcement message. In addition, other terminals may store other information related to performance information and performance information of the terminal included in the discovery announcement message.

In step S220, the terminal receives a discovery announcement message of another terminal included in terminals performing D2D communication. A terminal located at a nearby location from another terminal may receive a discovery announcement message of another terminal periodically broadcast or multicast from another terminal.

On the other hand, a time point at which each of the plurality of terminals performing communication according to the MCPTT service transmits the discovery announcement message may be determined according to the back-off time. This will be described later in more detail with reference to FIG.

In step S230, the terminal can acquire information on the existence and performance of the other terminal based on the received discovery announcement message.

The MS according to an exemplary embodiment can check whether another MS exists by receiving a discovery announcement message of another MS. In addition, the terminal may store the category of another terminal included in the discovery announcement message, video performance of the camera, state information of the terminal, and the like.

3 is a flowchart illustrating a method of periodically transmitting a discovery announcement message between a plurality of terminals according to an exemplary embodiment of the present invention.

In step S310, the first terminal, the second terminal, and the Nth terminal can activate 1: N D2D communication using ProSe (Proximity Services). For example, the first terminal, the second terminal and the Nth terminal can set a channel for 1: 2 D2D communication using ProSe. Here, it is assumed that the first to the Nth terminals are included in the same ProSe group.

In step S320, the first terminal may send a discovery announcement message. The discovery announcement message transmitted from the first terminal may be received at the second terminal and the Nth terminal. Here, the discovery announcement message may include capability information of the first terminal and other information related to performance information. For example, the discovery announcement message may include information about a category tag such as a particular video camera, video performance of the camera, status of the first terminal, and the like. The status of the first terminal may include, for example, video transmission, video recording, video reception, and the like.

However, this is only an example, and the information included in the discovery announcement message is not limited to the above-described example.

In step S330, the second terminal and the Nth terminal may store the existence of the first terminal and performance information of the first terminal. Each of the second terminal and the Nth terminal according to the embodiment can confirm the existence of the first terminal upon receiving the discovery announcement message. Also, each of the second terminal and the Nth terminal may acquire performance information included in the discovery announcement message, and may store the obtained performance information.

In step S340, the second terminal may transmit a discovery announcement message. The discovery announcement message transmitted from the second terminal may be received at the second terminal and the Nth terminal. Here, the discovery announcement message may include other information related to performance information and performance information of the second terminal.

In step S350, the first terminal may store the existence of the second terminal and the performance information of the second terminal.

In step S360, the Nth terminal may store the existence of the second terminal and performance information of the second terminal.

On the other hand, steps S350 and S360 are described sequentially for convenience of description, step S360 may be performed before step S350, and steps S350 and S360 may be performed simultaneously.

In step S370, the Nth terminal may transmit a discovery announcement message. The discovery announcement message transmitted from the Nth terminal may be received at the first terminal and the second terminal. Here, the discovery announcement message may include other information related to performance information and performance information of the Nth terminal.

In step S380, the first terminal and the second terminal may store the presence of the Nth terminal and performance information of the Nth terminal.

Meanwhile, the above-described steps S320, S340, and S370 may be performed periodically, and correspondingly, steps S330, S350, and S380 may be performed.

4 is a flowchart illustrating a method for setting a back-off time for transmitting a discovery announcement message by a plurality of terminals according to an exemplary embodiment of the present invention.

A plurality of terminals in accordance with an embodiment may set a back-off timer for transmission of a discovery announcement message to avoid collision. Each of the plurality of terminals may broadcast a discovery announcement message after the back-off time, depending on the setting.

In step S410, the first terminal, the second terminal, and the Nth terminal can activate 1: N D2D communication using ProSe.

In step S420, the first terminal, the second terminal, and the Nth terminal can determine the next time that discovery can be announced. For example, the first terminal, the second terminal, and the Nth terminal can determine the next available time to be announced based on at least one of a preconfigured value and a frequency of receiving a previous discovery announcement message, respectively.

In step S430, the first terminal may transmit a discovery announcement message. The first terminal according to an exemplary embodiment may transmit a discovery announcement message including the performance information and other information related to performance information of the first terminal after waiting for the determined back-off time.

In step S440, the second terminal and the Nth terminal may store the existence of the first terminal and performance information of the first terminal. Each of the second terminal and the Nth terminal according to the embodiment can confirm the existence of the first terminal upon receiving the discovery announcement message. Also, each of the second terminal and the Nth terminal may acquire performance information included in the discovery announcement message, and may store the obtained performance information.

Meanwhile, if the performance information of the first terminal is different from the previously stored information, the second terminal and the Nth terminal can update the information about the first terminal with the performance information of the newly received first terminal.

5 is a flowchart illustrating a method of searching for another terminal capable of communicating with a plurality of terminals according to an exemplary embodiment.

In step S510, the first terminal, the second terminal, and the Nth terminal can activate 1: N D2D communication using ProSe.

In step S520, the first terminal can search for a communication-enabled terminal. For example, the first terminal may broadcast a search message to search for another communicable terminal located in an area close to the first terminal. The search message may include at least one of a user ID of the first terminal, a terminal ID of the first terminal, performance information, and a category.

In step S530, as the second terminal receives the discovery message, it may transmit a discovery announcement message including performance information and other information related to performance information of the second terminal.

In step S540, upon receipt of the search message, the Nth terminal may transmit a discovery announcement message including performance information and other information related to performance information of the Nth terminal.

In step S550, the first terminal, the second terminal, and the Nth terminal may store presence information and performance information of the terminal that transmitted the discovery announcement message based on the discovery announcement message of the other terminal, respectively. For example, the first terminal may store the presence of the Nth terminal and the performance information of the Nth terminal based on the Discovery Notice message of the Nth terminal received from the Nth terminal. However, this is an embodiment only, and the first terminal may also store other information related to the performance information included in the discovery announcement message of the Nth terminal.

6 is a flowchart illustrating a method for determining a back-off time for transmitting a discovery announcement message upon receiving a search message according to an exemplary embodiment of the present invention.

In step S610, the first terminal, the second terminal, and the Nth terminal may activate 1: N D2D communication using ProSe.

In step S620, the first terminal may search for a communication-enabled terminal. For example, the first terminal may broadcast a search message to search for another communicable terminal located in an area close to the first terminal. The search message may include at least one of a user ID of the first terminal, a terminal ID of the first terminal, performance information, and a category.

In step S630, the second terminal and the Nth terminal can determine the next available time for discovery. For example, the first terminal, the second terminal, and the Nth terminal can determine the next available time to be announced based on at least one of a preconfigured value and a frequency of receiving a previous discovery announcement message, respectively.

In step S640, the second terminal may transmit a discovery announcement message. The second terminal according to one embodiment may transmit the discovery announcement message of the second terminal after waiting for the determined back-off time.

In step S650, the Nth terminal may transmit a discovery announcement message. The Nth terminal according to an embodiment may transmit the discovery announcement message of the Nth terminal after waiting for the determined back-off time.

In step S660, the first terminal, the second terminal, and the Nth terminal may store the existence of different terminals and performance information of other terminals, respectively. Each of the first terminal, the second terminal, and the Nth terminal according to an embodiment can confirm existence of a terminal that has transmitted a discovery announcement message according to receiving a discovery announcement message. Each of the first terminal, the second terminal, and the Nth terminal may acquire performance information included in the discovery announcement message, and may store the obtained performance information. Meanwhile, when the performance information of the other terminal is different from the previously stored information, the first terminal, the second terminal and the Nth terminal can update the information on the other terminal with the performance information of the newly received terminal .

7 is a flowchart illustrating a method for a terminal to broadcast a search message to search for a specific terminal according to an exemplary embodiment of the present invention.

In step S710, the first terminal, the second terminal, and the Nth terminal may activate 1: N D2D communication using ProSe.

In step S720, the first terminal may search for a communication-enabled terminal. For example, the first terminal may broadcast a search message to search for another communicable terminal located in an area close to the first terminal. The search message may include at least one of a user ID of the first terminal, a terminal ID of the first terminal, performance information, and a category.

In step S730, the Nth terminal may transmit a discovery announcement message. The Nth terminal according to an exemplary embodiment may transmit a discovery announcement message including performance information and other information related to performance information of the Nth terminal.

In step S740, the first terminal, the second terminal, and the Nth terminal may store the existence of different terminals and other information related to performance information and performance information of other terminals, respectively. For example, the first terminal can confirm the existence of the Nth terminal through the discovery announcement message of the Nth terminal received from the Nth terminal. Also, the first terminal may store other information related to performance information and performance information of the Nth terminal included in the discovery announcement message of the Nth terminal.

8 is a flowchart illustrating a method for a terminal to unicast a search message and search for a specific terminal according to an embodiment.

In step S810, the first terminal and the second terminal may activate 1: 1 D2D communication using ProSe.

In step S820, the first terminal can search for a communication-enabled terminal. For example, the first terminal may unicast a search message to search for a specific communicable terminal located in an area close to the first terminal. The search message may include at least one of a user ID of the first terminal, a terminal ID of the first terminal, performance information, and a category.

In step S830, the second terminal may transmit a discovery announcement message. The second terminal may transmit a discovery announcement message including performance information and other information related to performance information of the second terminal.

In step S840, the first terminal and the second terminal may store the existence of different terminals and other information related to performance information and performance information of other terminals, respectively. For example, the first terminal may store the existence of the second terminal, performance information of the second terminal, and other information related to the performance information through the discovery announcement message received from the second terminal. Also, the second terminal checks whether the first terminal is present through the search message received from the first terminal, and determines whether the first terminal includes the user ID of the first terminal, the terminal ID of the first terminal, Lt; / RTI >

9 is a flowchart illustrating a method for a terminal to search for another terminal in group communication according to an embodiment of the present invention.

In this embodiment, it is assumed that the third terminal and the Nth terminal are terminals participating in an MCVideo group communication in progress.

In step S910, the first terminal, the second terminal, the third terminal, and the Nth terminal may be included in the same MCVideo group.

In step S920, the third terminal and the Nth terminal can perform MCVideo group communication.

In step S930, the second terminal may search for MCVideo group communication. For example, the second terminal may broadcast a search MCVideo group communication message to detect whether there are terminals performing MCVideo group communication among the terminals included in the MCVideo group.

In step S940, the third terminal and the Nth terminal can determine the next time for the periodic group communication announcement. For example, the third terminal and the Nth terminal may each determine a next time at which the group communication can be announced based on at least one of a predetermined value and a frequency at which a previous MCVideo group communication announcement message was received.

In step S950, the third terminal may announce the MCVideo group communication. In step S940, the third terminal according to one embodiment may transmit the MCVideo group communication announcement message after the determined back-off time has elapsed. The MCVideo group communication announcement message may include a Session Description Protocol (SDP) body. The other terminal (e.g., the Nth terminal) determining the back-off time may drop its MCVideo group communication announcement message as the MCVideo group communication announcement message of the third terminal is received. Accordingly, the MCVideo group communication announcement message of the Nth terminal may not be broadcasted.

In step S960, the first terminal and the second terminal can establish a media plane. The first terminal and the second terminal, which are terminals not participating in the MCVideo group communication in progress, can set the media plane according to the information included in the MCVideo group communication message as the MCVideo group communication message is received.

Meanwhile, the media plane according to an exemplary embodiment is a transmission / reception channel for data such as voice and video, and can control the flow of media.

In step S970, the first terminal through the Nth terminal may perform MCVideo group communication. As the media plane is set according to the information contained in the MCVideo group communication announcement message received from the third terminal, the first terminal and the second terminal can participate in ongoing MCVideo group communication.

10 is a flowchart illustrating a method of setting up a group communication by a terminal according to an exemplary embodiment.

In step S1010, the first terminal, the second terminal, and the Nth terminal may be included in the same MCVideo group.

In step S1020, the first terminal may search for an MCVideo group communication in progress. As the first terminal receives the user's request for the establishment of the MCVideo group communication, it can begin searching for the MCVideo group communication in progress in the requested MCVideo group.

In step S1030, the first terminal may announce the MCVideo group communication. The first terminal may broadcast an MCVideo group communication announcement message to other terminals in the MCVideo group if it is determined that there is no MCVideo group communication in progress within a close range for the requested MCVideo group. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1040, as the MCVideo group communication announcement message is received, all the idle MCVideo terminals can set the media plane according to the information included in the MCVideo group communication announcement message.

In step S1050, the first terminal may announce the group communication. The first terminal according to an embodiment may broadcast the MCVideo group communication announcement message periodically to the MCVideo group as the MCVideo group communication is established, based on the media plane. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1060, the second terminal may announce the group communication. The second terminal according to one embodiment may broadcast the MCVideo group communication announcement message periodically to the MCVideo group as the MCVideo group communication is established, based on the media plane. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1070, the Nth terminal can announce the group communication. The Nth terminal according to an exemplary embodiment may broadcast an MCVideo group communication announcement message periodically to the MCVideo group as the MCVideo group communication is established based on the media plane. Here, the MCVideo group communication announcement message may include the SDP body.

In the above-described embodiment, steps S1050, S1060, and S1070 may be performed periodically. In addition, in the above-described embodiment, the group communication announcement message includes information on the user ID, group ID, media type codec, control port for video transmission, video resolution, video frame rate, video mode, And may include at least one. The video mode represents the level of urgency of the situation and may include an urgent real time mode, a non-urgent real time mode, and a non-real time mode . The latency of the video stream can be controlled according to the video mode.

11 is a flowchart illustrating a method of setting back-off in a group communication according to an exemplary embodiment of the present invention.

In step S1110, the first terminal, the second terminal, and the Nth terminal may be included in the same MCVideo group.

In step S1120, the first terminal may search for an ongoing MCVideo group communication. As the first terminal receives the request for the establishment of the MCVideo group communication, it can start searching for the MCVideo group communication in progress in the requested MCVideo group.

In step S1130, the first terminal may announce the group communication. The first terminal may broadcast an MCVideo group communication announcement message to other terminals in the MCVideo group if it is determined that there is no MCVideo group communication in progress within a close range for the requested MCVideo group. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1140, as the MCVideo group communication announcement message is received, all the idle MCVideo terminals can set the media plane according to the information included in the MCVideo group communication announcement message. Here, the idle MCVideo terminal may indicate a terminal that does not set a media plane for group communication.

In step S1150, the first terminal, the second terminal, and the Nth terminal may determine the next time for the periodic group communication announcement. The first terminal, the second terminal and the Nth terminal can determine the next time the group communication announcement is possible as the MCVideo group communication is established based on the media plane.

For example, the first terminal, the second terminal and the Nth terminal may each determine a next time to announce a group communication based on at least one of a preconfigured value and a frequency of receiving an MCVideo group communication announcement message .

In step S1160, the second terminal may announce the group communication. The second terminal according to one embodiment may send the MCVideo group communication announcement message after the determined back-off time. Here, the MCVideo group communication announcement message may include the SDP body.

Meanwhile, another terminal receiving the MCVideo group communication announcement message can re-determine the back-off time.

12 is a flowchart illustrating a method of manually participating in MCVideo group communication according to an embodiment of the present invention.

In step S1210, the first terminal and the second terminal can perform MCVideo group communication.

In step S1220, the Nth terminal can enter the communication range. Here, it is assumed that the Nth terminal enters the communication range after the MCVideo group communication is established. The Nth terminal may wait for the group communication notice message to be transmitted from another terminal participating in the MCVideo group communication.

In step S1230, the second terminal may announce the group communication. The second terminal participating in the MCVideo group communication can broadcast the MCVideo group communication announcement message. However, the second terminal is only an embodiment, and the first terminal, which is another terminal participating in the MCVideo group communication, may broadcast the MCVideo group communication announcement message. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1240, the Nth terminal can set the media plane. As the MCVideo group communication announcement message is received, the Nth terminal can set the media plane according to the information included in the MCVideo group communication announcement message.

In step S1250, the Nth terminal may broadcast a response to inform other terminals in the MCVideo group communication of the participation of the Nth terminal.

In step S1260, the first terminal may transmit the transmission control capture information to the Nth terminal. Here, the transmission control capture information may include information of a terminal having transmission control authority.

In step S1270, the first terminal, the second terminal, and the Nth terminal may perform MCVideo group communication.

 13 is a flowchart illustrating a method of actively participating in MCVideo group communication according to an embodiment of the present invention.

In step S1310, the first terminal and the second terminal can perform MCVideo group communication.

In step S1320, the Nth terminal can search for an MCVideo group communication in progress. After the MCVideo group communication is established, the Nth terminal that has entered the communication range can broadcast the MCVideo group communication search message to search for the MCVideo group communication.

In step S1330, the second terminal may announce the group communication. The second terminal participating in the MCVideo group communication can broadcast the MCVideo group communication announcement message. However, the second terminal is only an embodiment, and the first terminal, which is another terminal participating in the MCVideo group communication, may broadcast the MCVideo group communication announcement message. Here, the MCVideo group communication announcement message may include the SDP body.

In step S1340, the Nth terminal can set the media plane. As the MCVideo group communication announcement message is received, the Nth terminal can set the media plane according to the information included in the MCVideo group communication announcement message.

In step S1350, the Nth terminal may broadcast a response to inform other terminals in the MCVideo group communication of the participation of the Nth terminal.

In step S1360, the first terminal may transmit the transmission control capture information to the Nth terminal. Here, the transmission control capture information may include information of a terminal having transmission control authority.

In step S1370, the first terminal, the second terminal, and the Nth terminal may perform MCVideo group communication.

14 is a flowchart illustrating a method of updating a MCVideo group communication according to an embodiment of the present invention.

In step S1410, the first terminal, the second terminal, and the Nth terminal may perform MCVideo group communication.

In step S1420, the first terminal may announce updated group communication. The first terminal according to an exemplary embodiment may broadcast an MCVideo group communication announcement message including information on the updated group communication. Here, the updated MCVideo group communication announcement message may include the updated SDP body.

In step S1430, the second terminal and the Nth terminal may trample the parameters of the received MCVideo group communication announcement message and the pre-stored parameters in the established MCVideo group communication.

In step S1440, the second terminal and the Nth terminal can set the media plane according to the updated MCVideo group communication announcement message. For example, the second terminal and the Nth terminal may update the media plane according to parameters included in the updated MCVideo group communication announcement message.

On the other hand, when the parameter included in the updated MCVideo group communication notification message is different from the previously stored parameter, the second terminal and the Nth terminal determine whether to update the media plane based on the priority of the call, call type, parameter change time, . Here, the priority of the call may be determined based on the urgency, and may include, for example, emergency, basic, imminent peril, and the like. The call type can be determined according to whether the data to be transmitted is voice, whether it is a video, or whether it is a combination of audio and video.

In step S1450, the first terminal, the second terminal, and the Nth terminal may periodically announce the group communication according to the changed parameters. For example, the first terminal, the second terminal, and the Nth terminal may periodically transmit the MCVideo group communication announcement message including the updated parameter, according to the update.

15 is a block diagram illustrating a terminal 1500 according to one embodiment.

The terminal 1510 may include a communication unit 1510, a processor 1520, and a memory 1530.

The communication unit 1510 is connected to the processor 1520 and transmits and / or receives a message according to the MCPTT service. For example, the communication unit 1510 may transmit and / or receive a discovery announcement message, a search message, and an MCVideo group communication announcement message according to the control of the processor 1520. [

Processor 1520 implements the proposed functionality, process and / or method. The operation of terminal 1500 described above may be implemented by processor 1520. [ The processor 1520 in accordance with one embodiment may be configured to perform various operations including, but not limited to, disparity notification, search, group call discovery, group call announcement, media plane setup, and media plane update in an MCPTT service, as described above with reference to FIGS. Process can be performed.

The processor 1520 may control the communication unit 1510 to transmit the discovery announcement message and to receive the discovery announcement message of another terminal included in the terminals performing the D2D communication. In addition, the processor 1520 may obtain information on the existence and performance of other terminals based on the received discovery announcement message.

The processor 1520 in accordance with one embodiment may determine the backoff time for transmission of the discovery announcement message based on at least one of a predefined value and a frequency of receiving a discovery announcement message of another terminal that was received prior to transmission of the discovery announcement message You can decide. In addition, the processor 1520 may control the communication unit 1510 to send a discorci notice message after the determined back-off time.

The processor 1520 according to an embodiment broadcasts a search message to search for another terminal capable of communicating with the terminal and receives a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message. Can be controlled. The processor 1520 may obtain information on the presence and performance of other terminals based on the received discovery announcement message in response to the discovery message.

The processor 1520 according to one embodiment controls the communication unit 1510 to unicast a search message to another terminal capable of communicating with the terminal and receive a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message can do. In addition, the processor 1520 may obtain information on the presence and performance of other terminals based on the received discovery announcement message in response to the search message.

The processor 1520 according to an exemplary embodiment may control the communication unit 1510 to transmit a group communication search message for confirming whether group communication of at least some terminals included in the same group as the terminal is performed. In addition, the processor 1520 may set the media plane based on the group communication announcement message received in response to the group communication discovery message, and may perform group communication with at least some terminals according to the set media plane.

The processor 1520 in accordance with one embodiment may control the communication unit 1510 to send a group communication announcement message of the terminal if there is no ongoing group communication. In addition, when the media plane is set according to the group communication notification message transmitted to another terminal that has received the group communication notification message of the terminal, the processor 1520 transmits the group communication notification message to the communication unit 1510).

The processor 1520 according to an exemplary embodiment may control the communication unit 1510 to transmit a group communication notice message including updated information when the information of the terminal is updated.

Processor 1520 may include an application-specific integrated circuit (ASIC), other chipset, logic circuitry and / or data processing device.

The memory 1530 is coupled to the processor 1520 and stores protocols and parameters for operation. The memory 1530 may also store at least one instruction that can direct the processor 1520 to perform the process described above with reference to Figs.

Memory 1530 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module may be stored in memory 1530 and executed by processor 1520. [ The memory 1530 may be internal or external to the processor 1520 and may be coupled to the processor by various well known means.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

All documents, including publications, patent applications, patents, and the like, cited in the disclosed embodiments are incorporated herein by reference in their entirety for all of the cited documents either individually and specifically incorporated herein by reference, Can be merged.

For purposes of understanding the disclosed embodiments, reference is made to the preferred embodiments illustrated in the drawings, and specific terminology is used to describe the disclosed embodiments, but it should be understood that the disclosed embodiments are not limited to the specific embodiments, And may include all components that are commonly conceivable to those skilled in the art.

The disclosed embodiments may be represented by functional block configurations and various processing steps. These functional blocks may be implemented in a wide variety of hardware and / or software configurations that perform particular functions. For example, the disclosed embodiments may be implemented with integrated circuit components such as memory, processing, logic, look-up tables, etc., which may perform various functions by control of one or more microprocessors or by other control devices Can be employed. Similar to what the elements of the disclosed embodiments may be implemented with software programming or software elements, the disclosed embodiments may be implemented in various ways, including various algorithms implemented in a data structure, processes, routines, , Java (Java), assembler, and the like. Functional aspects may be implemented with algorithms running on one or more processors. In addition, the disclosed embodiments may employ conventional techniques for electronic configuration, signal processing, and / or data processing, and the like. Terms such as "mechanism", "element", "means", "configuration" may be used broadly and are not limited to mechanical and physical configurations. The term may include the meaning of a series of routines of software in conjunction with a processor or the like.

The particular implementations described in the disclosed embodiments are, by way of example, not intended to limit the scope of the disclosed embodiments in any way. For brevity of description, descriptions of conventional electronic configurations, control systems, software, and other functional aspects of such systems may be omitted. Also, the connections or connecting members of the lines between the components shown in the figures are illustrative of functional connections and / or physical or circuit connections, which may be replaced or additionally provided by a variety of functional connections, physical Connection, or circuit connections. Also, unless expressly stated to the contrary, such terms are " essential ", " significant ", and the like, they may not necessarily be necessary components for the application of the disclosed embodiments.

Claims (19)

A method for providing a Mission Critical Video (MCVideo) service,
Wherein the terminal, which is one of the terminals included in the MCVideo group, transmits a discovery announcement message including at least one of the category of the terminal and the video capability of the terminal;
Receiving a discovery announcement message of another terminal included in the MCVideo group from the other terminal; And
And acquiring information on the presence and performance of the other terminal based on the received discovery announcement message. The method according to claim 1,
Determining a back-off time for transmission of the discovery announcement message based on at least one of a preset value and a reception frequency of a discovery announcement message of another terminal received before transmission of the discovery announcement message,
Wherein the transmitting the discovery announcement message comprises:
And transmitting the discovery announcement message after the determined back-off time. The method according to claim 1,
Broadcasting a search message to search for another terminal capable of communicating with the terminal;
Receiving a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message; And
Further comprising the step of acquiring information on the presence and performance of another terminal capable of communicating with the terminal based on the discovery announcement message received in response to the search message. 4. The method of claim 3, wherein the discovery announcement message of another terminal capable of communicating with the terminal comprises:
A predetermined value of another terminal capable of communicating with the terminal and a frequency of reception of a previously received discovery announcement message after a determined back-off time has elapsed. The method according to claim 1,
Unicasting a search message to another terminal capable of communicating with the terminal;
Receiving a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message; And
Further comprising the step of acquiring information on the presence and performance of another terminal capable of communicating with the terminal based on the discovery announcement message received in response to the search message. The method according to claim 1,
Transmitting a group communication search message for confirming whether group communication of at least some terminals included in the same MCVideo group with the terminal is performed;
Establishing a media plane based on the group communication announcement message received in response to the group communication discovery message; And
And performing group communication with the at least some terminals according to the set media plane. The method according to claim 6,
If the ongoing group communication does not exist, transmitting a group communication notification message of the terminal; And
Further comprising the step of receiving a group communication notification message of another terminal that sets the media plane when a media plane according to the transmitted group communication notification message is set to another terminal that has received the group communication notification message of the terminal, Way. The method of claim 6, wherein the group communication announcement message of the other terminal,
Wherein the media plane is received after a determined back-off time based on at least one of a pre-set value of another configured terminal and a received frequency of a previously received discovery announcement message. The method according to claim 6,
When the information of the terminal is updated, transmitting a group communication notice message including updated information,
Wherein the setting of the media plane of the group communication is changed based on the group communication announcement message including the updated information. A terminal for providing an MCVideo service,
A communication unit for transmitting and receiving a message according to the MCVideo service; And
Wherein the terminal, which is one of the terminals included in the MCVideo group, transmits a discovery announcement message including at least one of the category of the terminal and the video capability of the terminal, And a processor for controlling the communication unit to receive a discovery announcement message of the terminal from the other terminal and acquiring information on the existence and performance of the other terminal based on the received discovery announcement message. 11. The apparatus of claim 10,
Determining a back-off time for transmission of the discovery announcement message based on at least one of a predetermined value and a reception frequency of a discovery announcement message of another terminal received before transmission of the discovery announcement message; And then controls the communication unit to transmit the discovery announcement message. 11. The apparatus of claim 10,
The communication unit broadcasts a search message for searching for another terminal capable of communicating with the terminal and controls the communication unit to receive a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message, Acquires information on the existence and performance of another terminal capable of communicating with the terminal based on the discovery announcement message received in response to the discovery announcement message. 13. The method of claim 12, wherein the discovery announcement message of another terminal capable of communicating with the terminal comprises:
A predetermined value of another terminal capable of communicating with the terminal, and a reception frequency of a previously received discovery announcement message, after a predetermined back-off time has elapsed. 11. The apparatus of claim 10,
Controls the communication unit to receive a discovery announcement message of another terminal capable of communicating with the terminal in response to the search message, unicasts a search message to another terminal capable of communicating with the terminal, receives the search message in response to the search message Acquires information on the presence and performance of another terminal capable of communicating with the terminal based on the discovery announcement message. 11. The apparatus of claim 10,
The control unit controls the communication unit to transmit a group communication search message for confirming whether group communication of at least some terminals included in the same MCVideo group with the terminal is performed and transmits the group communication notification message received in response to the group communication search message Sets a media plane and performs group communication with the at least some terminals according to the set media plane. 16. The apparatus of claim 15,
When there is no group communication in progress, transmits a group communication notification message of the terminal, and when a media plane according to the transmitted group communication notification message is set in another terminal that has received the group communication notification message of the terminal, And controls the communication unit to receive a group communication notification message of another terminal that sets the plane. 16. The method of claim 15, wherein the group communication announcement message of the other terminal,
Wherein the media plane is received after a determined back-off time based on at least one of a preset value of another configured terminal and a reception frequency of a previously received discovery announcement message. 16. The apparatus of claim 15,
When the information of the terminal is updated, controls the communication unit to transmit a group communication notification message including updated information,
Wherein setting of a media plane of the group communication is changed based on a group communication notice message including the updated information. A computer-readable recording medium storing a program for executing the method according to any one of claims 1 to 9.

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