KR20130119887A - Method for initial restablishing of session for mpeg media transport based media transmission - Google Patents

Abstract

A session preset method between a terminal and a server is proposed in a MPEG media transport (MMT) system. The present invention collects MMT function information, which is able to be supported by the terminal in the terminal, transmits an MMT initial registration request including the MMT function information from the terminal to the server, stores the MMT function information in the server, generates initial configuration in the server, transmits a result for the MMT initial registration request or MMT initial registration acknowledgement (Ack) including additional information requested by the terminal to the terminal, and includes transmission for transmitting media traffic from the server to the terminal through an MMT protocol and an RTP protocol. [Reference numerals] (AA) Server;(BB) Terminal;(S400) Set a session;(S405) Collect MMT function information, which is able to be supported by the terminal;(S410) Request for an MMT initial registration;(S415) Generate initial configuration;(S420) Check the MMT initial registration;(S425) Media traffic;(S430) Perform signaling in real time for controlling sessions

Description

METHOOD FOR INITIAL RESTABLISHING OF SESSION FOR MPEG MEDIA TRANSPORT BASED MEDIA TRANSMISSION}

The present invention relates to a method for initial setting of a session for efficient media transmission in an MPEG MMT (MPEG Media Transport) system.

As a method for media streaming service over an IP network, there is a Real-time Transport Protocol (RTP). RTP carries the media traffic (eg video, audio).

Meanwhile, a Real Time Streaming Protocol (RTSP) and a Session Initiation Protocol (SIP) may be used to establish a session and control a session between a server and a client for a media streaming service.

RTSP is defined in "IETF RFC2326" as a text-based standard protocol for controlling streaming data on the Internet. RTSP does not transmit media, but acts as a network remote control for multimedia servers. In addition, RTCP (RTP Control Protocol) performs a real-time QoS control role.

SIP is a signaling protocol defined by the IETF that performs multimedia session control such as voice and video calls. SIP is an application layer for procedures for intelligent terminals (eg, telephones, Internet conferences, instant messengers, etc.) that want to communicate on the Internet to identify and locate each other and to create, delete or modify multimedia communication sessions between them. Is the signaling protocol of.

There is a need for a method of initializing a session for efficient media transmission in an MMT system supporting RTP, RSTP, and SIP.

An object of the present invention is to provide an efficient MMT-based streaming service.

Another technical problem of the present invention is to share information on a supportable service function and related information between a transmitter and a receiver before transmitting the actual media data after establishing a transmission session between the transmitter and the receiver.

Another technical problem of the present invention is to provide a signaling method for initializing a media session between a terminal and a server.

Another technical problem of the present invention is to provide and utilize signaling for registration of a function that a terminal can provide to a server to a terminal and a current media transmission network before media traffic transmission.

Another technical problem of the present invention is to provide signaling for sharing initial configuration information between a terminal and a server before media traffic is transmitted using the MMT protocol.

According to an aspect of the present invention, in the MMT system, a method for establishing a session between a terminal and a server may include collecting, by the terminal, MMT function information supported by the terminal, the collected MMT function information supported by the terminal. Transmitting an MMT initial registration request from the terminal to the server, storing MMT function information supported by the terminal in the server, and generating an initial configuration in the server; Transmitting an MMT initial registration acknowledgment (MMT Initial Registration Ack) including a result of the MMT initiation registration request or additional information required by the terminal to the terminal; and media traffic through an MMT protocol and an RTP protocol. And transmitting from the server to the terminal, wherein the MMT start registration request is performed in the terminal. A device type, which is an indicator indicating a type of, an access type, which is an indicator indicating whether registration of a terminal to the server is initial registration, a packet type, which is an indicator indicating a type of a packet for which the terminal transmits an MMT payload, and the And at least one of a support function indicator indicating information on a function related to MMT transmission that can be supported by the terminal in a bit string, and the MMT start registration confirmation includes information indicating an address of an ARQ server that can be supported by the terminal.

According to the present invention, the MMT-based media transmission system can share the initial configuration information between the client and the server, the server can provide a service within the function of the MMT service that the terminal can support, the terminal and the receiving environment of the terminal The traffic of the network can be reduced, and various services of a transport layer suitable for a terminal can be provided.

According to the present invention, it is possible to effectively provide a media transmission service based on an MMT system including a multi-screen service and a multimedia migration service.

1 shows an example of a functional architecture of an MMT system.
2 is a flowchart illustrating an example of establishing a media transmission session via RTSP.
3 is an example of a protocol stack including an MMT based protocol structure according to the present invention.
4 is a flowchart illustrating an example of a session initial setup operation for MMT based media transmission according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the purpose and effect of the present invention are not limited by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

MPEG Media Transport (MMT) is a standard technology under development in the MPEG system sub-working group.

1 shows an example of a functional architecture of an MMT system.

Referring to FIG. 1, the functional structure includes three layers of an E function layer (Encapsulation Function) 105, a D function layer (Delivery Function 110), and an S function layer (Signaling Function) 115.

The three layers may operate in conjunction with the media coding layer 120, the transport protocol 125, and the Internet protocol 130.

Hereinafter, a signaling method for initializing a media session that can be provided in the S layer 115 of the MMT for providing a streaming service to various multimedia applications is proposed.

2 is a flowchart illustrating an example of establishing a media transmission session via RTSP before initial MMT session setup.

Referring to FIG. 2, the server RTSP 210, which is a media server, exchanges essential commands with the client RTSP 220, which is a media player. For example, "DESCRIBE", "SETUP", "PLAY", "PAUSE", and "TEARDOWN" are the "Subscribe", "Setup", "Play", Mandatory commands for "pause" and "release". In addition, there is a command "SET_PARAMETER" for changing a server parameter and a command "REDIRECT" for changing a connection server of a client.

Based on the necessary instructions, the RTSP establishes and controls a transmission session and transmits actual media traffic through the RTP through the generated transmission session.

3 is an example of a protocol stack including an MMT based protocol structure according to the present invention. A protocol stack in which a client terminal receives a multimedia streaming service.

Referring to Figure 3, RTSP or SIP is a protocol for connecting a transport session.

RTP and RTCP are protocols that transmit multimedia data and send and receive basic information necessary for flow control in real time.

The MMT 300 includes an E layer (Encapsulation Layer), a D1 layer (MMT D1. Layer), a D2 layer (MMT D.2 Layer), and an S layer (MMT S Layer).

The client terminal may receive multimedia data through the MMT 300 and may receive various transmission related functions. That is, the MMT 300 connects the transport session through the session establishment protocol of RTSP or SIP in order to receive the MMT-based multimedia streaming service, the client terminal in place of the various configuration information necessary for the MMT service and the actual RTP It is a protocol that functions to receive multimedia data.

Not all UEs need to be essentially equipped with FEC, ARQ, hybrid transmission, and the like, and the UE may selectively support only some of transmission control services (eg, FEC, ARQ, hybrid). At this time, in order to be compatible with the existing terminal, the server must know such "supportable service information of the terminal".

4 is a flowchart illustrating an example of an MMT session initial setup operation for MMT based media transmission according to the present invention. According to the present invention, signaling of the MMT for media transmission is transmitted and received in the S layer of the protocol.

Referring to FIG. 4, when a media transmission service is requested by a multimedia application, a media transmission session is established by a session establishment protocol (eg, RTSP, SIP) between a server (or a transmitter) and a terminal (or receiver or client). (S400). The terminal may be a portable device or a smart TV.

The terminal collects supportable MMT function information (supported MMT function) from among available MMT related functions (collect) (S405).

After step S405, the UE transmits an MMT initial registration request to the server through the S layer (S410). That is, the terminal may transmit the MMT start registration request information to the server by formatting the MMT start registration request information as an “MMT start registration message” which is an S layer message of the MMT. The MMT start registration request may include information related to a transmission function that can be supported by the terminal.

Table 1 shows an example of an MMT start registration message.

Syntax Number of bits Mnemonics
(mnemonic) MMT_initial_Registration () {
device_type
access_type
packet type
supported feature indicator (FI)
if (ARQ indication bit == '1') {
support arq type
maximum arq no
}
if (RATE CONTROL indication bit == '1') {
for (i = 0; i <num_hybrid; i ++) {
ipaddr [i]
BER [i]
Duration [i]
}
}
if (FEC indication bit == '1') {
initial information ()
}
}
4
2
2
8

4
4



128 or 32
8
32



TBD
bslbf
bslbf
bslbf
bslbf

bslbf
bslbf



bslbf
bslbf
bslbf



bslbf

Referring to Table 1, a device type indicates a type of a terminal (or client) and may be a mobile device or a smart TV.

The access type distinguishes whether the registration of the terminal to the server is "first registration after the session is established" or "update of information according to the terminal change due to the terminal change for the session". It can be used in a multi-screen service and a multimedia migration service.

The packet type indicates whether the UE can support an RTP packet or an MMT packet in transmitting an MMT payload.

The supported feature indicator indicates information about a function related to MMT transmission that can be supported by the terminal in a bit string.

An example of the support function indicator is shown in the following table. Support function indicators may include rate control, ARQ, FEC or HYBRID. "Rerserved" refers to reserved bits that are not used.

Resrved Reserved Reserved Reserved RATE CONTROL ARQ FEC HYBRID

Here, the rate control (RATE CONTROL) is an indicator indicating whether or not information for the radar control function can be provided. When the indicator is set, "ipaddr" indicating the IP address for the terminal, "BER" indicating the bit error rate collected from the PHY or MAC layer through the D3 interface in the terminal, the time required to calculate the BER At least one of "Duration" in millisecond units may be transmitted to the server.

In addition, the ARQ is an indicator indicating whether the terminal can support the function of the ARQ. When the indicator is set, at least one of "supported ARQ type" representing a supported ARQ type or "maximum ARQ no" representing a maximum ARQ may be transmitted to the server.

In addition, the FEC is an indicator indicating whether the terminal can support the FEC function. When the indicator is set, "initial information" indicating initial information may be transmitted to the server.

In addition, the HYBRID client terminal is an indicator indicating whether the hybrid network reception function is available.

Subsequently to step S410, the server stores a transmission function that can be supported by the terminal and creates an initial configuration based on this (S415). The server may provide a media transmission service within the supportable range of the terminal.

The server provides all the functions of the MMT and the existing streaming service.

The server transmits an MMT Initial Registration Ack including a result of the MMT start registration request or additional information requested by the UE to the UE through the S layer (S420). The MMT start registration confirmation is a response message to the MMT start registration request.

The MMT start registration acknowledgment may be formatted as an S layer message “MMT start acknowledgment message” and transmitted to the terminal, and the S layer message may include an MMT packet or additional information.

Table 3 shows an example of the MMT start confirmation message.

Syntax Number of bits Mnemonic MMT_initial_Registration_Ack () {
if (ARQ FI is == '1') {
ipaddr
port
}
}

128 or 32
16

uimsbf
uimsbf

Referring to Table 3, if the terminal supports ARQ and the corresponding ARQ server is different from the current streaming server, "ipaddr" representing the IP address of the ARQ server address and "port" representing the port number are delivered to the terminal. .

After step S420, the server transmits media traffic to the terminal through the MMT protocol and the RTP protocol (S425). That is, the server transmits the MMT packet or the RTP packet to the terminal.

In this case, the server may transmit the media traffic using the information of the initial terminal and the terminal peripheral network.

As an example, when the terminal does not support the ARQ function, the server performs transmission except for the information on the ARQ.

As another example, when the terminal is available for a hybrid transport network, the terminal provides a service to the hybrid network based on a request of an E-layer payload.

As another example, when the terminal cannot use the hybrid transport network, the terminal may provide a service to only one transmission network even at the request of the E layer.

As another example, the terminal or the server may perform a rate control function in consideration of the BER of the corresponding session.

The server may determine whether to use the RTP layer or the MMT D2 layer in transmitting the MMT payload based on the protocol included in the MMT start registration request transmitted from the terminal.

Meanwhile, optionally, real time signaling for session control may be performed between the server and the terminal (S430).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. But is not limited thereto.

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 or simultaneously . 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.

Claims (1)

In a method of establishing a session between a terminal and a server in an MMT (MPEG MEDIA TRANSPORT) system,
Collecting MMT function information supported by the terminal from the terminal;
Transmitting an MMT initial registration request from the terminal to the server, the MMT initial registration request including collected MMT function information supported by the terminal;
Storing MMT function information supported by the terminal in the server and generating an initial configuration in the server;
Delivering an MMT Initial Registration Ack including a result of the MMT initiation registration request or additional information requested by the UE to the UE; And
Delivering media traffic from the server to the terminal through an MMT protocol and an RTP protocol;
The MMT start registration request is a device type that is an indicator indicating the type of the terminal, an access type that is an indicator indicating whether the registration of the terminal to the server is the initial registration, a type of a packet in which the terminal transmits the MMT payload. At least one of a packet type, which is an indicator indicating a, and a supporting function indicator indicating information on a function related to MMT transmission that can be supported by the terminal in a bit string;
The MMT initiation registration confirmation method comprising the information indicating the address of the ARQ server that the terminal can support.

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