JP3922575B2 - QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control - Google Patents

QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control Download PDF

Info

Publication number
JP3922575B2
JP3922575B2 JP2003176567A JP2003176567A JP3922575B2 JP 3922575 B2 JP3922575 B2 JP 3922575B2 JP 2003176567 A JP2003176567 A JP 2003176567A JP 2003176567 A JP2003176567 A JP 2003176567A JP 3922575 B2 JP3922575 B2 JP 3922575B2
Authority
JP
Japan
Prior art keywords
content
subsystem
sip
bandwidth
sip session
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2003176567A
Other languages
Japanese (ja)
Other versions
JP2005012655A (en
Inventor
勉 東
満 浅村
英樹 笠原
Original Assignee
日本電信電話株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to JP2003176567A priority Critical patent/JP3922575B2/en
Publication of JP2005012655A publication Critical patent/JP2005012655A/en
Application granted granted Critical
Publication of JP3922575B2 publication Critical patent/JP3922575B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technology for controlling a bandwidth control system that guarantees QoS (Quality of Service) of a bandwidth in the distribution of content using an IP (Internet Protocol) network. The present invention relates to a technique for efficiently guaranteeing QoS even if streaming is realized by a protocol.
[0002]
[Prior art]
As a QoS guarantee technique in a conventional CDN (Content Delivery Network), for example, it is described in Patent Document 1 (“bandwidth control method, network service system, content server device, bandwidth management device, and content management device”).
[0003]
Although this technology controls the bandwidth management device from the content server and reduces the burden on the user, the control between the content server and the bandwidth management device becomes complicated, and a general-purpose protocol has not been applied. The problem remains in the nature and versatility.
[0004]
[Patent Document 1]
JP 2003-051846 A
[0005]
[Problems to be solved by the invention]
As described above, although the QoS guarantee method in the conventional CDN can control the bandwidth management device from the content server, for example, and can reduce the burden on the user terminal device, the control between the content server and the bandwidth management device becomes complicated. Since general-purpose protocols are not applied, there are problems in economic efficiency and versatility.
[0006]
In order to solve the above problem, the present invention naturally uses a standard protocol for transmission and reception of signals between a user terminal device and an IP communication network, and enables the standard protocol to be applied to a content server. Another object of the present invention is to realize a QoS guarantee method and system with high versatility and high cost that enables system construction and bandwidth control even when the content server does not implement a standard protocol.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a feature of the present invention resides in that a SIP (Session Initiation Protocol) protocol is applied between a user terminal device and a network-side device in a content distribution network. The SIP protocol is an indispensable protocol for realizing a communication service between user terminal devices in an IP communication network. By applying this protocol, a content distribution network facility and a user terminal device are provided on the same IP communication network. The system can be used in common with the equipment that realizes the communication service between them, so that a highly versatile and economical system can be constructed.
That is, according to the present invention, in a QoS guarantee method in a CDN by SIP session control using an IP network, a procedure in which a terminal device of a content viewer acquires the address of the content from a content address management server subsystem, and a SIP session A procedure for requesting the content distribution subsystem to establish a session prior to viewing the content via the control subsystem, and the content distribution subsystem obtains information on a band necessary for viewing the content when the session is established. A procedure for notifying the SIP session control subsystem, a procedure for the SIP session control subsystem to request a bandwidth reservation to the bandwidth control subsystem based on the bandwidth information, and a procedure for notifying the terminal device of a bandwidth reservation result And the terminal device Has a step of requesting the release of the session after watching Ceiling, the SIP session control subsystem, and a procedure for requesting the bandwidth freed band-control subsystem. In addition, the specification in the SIP address of the content viewed by the viewer has one SIP address in the content distribution subsystem that stores the content, and the specification of the content is specified in the option field of the SIP address. It is characterized by that. In the procedure in which the terminal device requests the content distribution subsystem to establish a session prior to viewing the content via the SIP session control subsystem, the SIP session control subsystem performs the SIP of the content distribution subsystem. A feature is characterized in that the presence / absence of correspondence is determined, a session is established with the content distribution subsystem when the SIP correspondence is present, and the SIP session control subsystem simulates the session control function of the content distribution subsystem when the SIP correspondence is absent. To do.
The present invention is also a QoS guarantee system in a CDN based on SIP session control using an IP network, and a content viewer terminal device is associated from the content address management server subsystem to the content address management server subsystem. The address in the first address format for designating the content is obtained, and the content is specified in the option field of the SIP address for designating the content distribution subsystem storing the content in the first address format. Means for converting to an address in the second address format, means for converting from an address in the second address format included in the response message transmitted from the content distribution subsystem to an address in the first address format, and SIP Means for requesting the content distribution subsystem to establish a session via the session control subsystem, means for including bandwidth information necessary for viewing the content in a message requesting establishment of the session, SIP session control sub Means for receiving a bandwidth securing result transmitted from the system, and the content distribution subsystem needs to identify the content from an address in the second address format, and to view the content when a session is established And a means for transmitting the bandwidth information to the SIP session control subsystem. The SIP session control subsystem receives the bandwidth information necessary for viewing the content transmitted from the content distribution subsystem when the session is established. And bandwidth control support based on the bandwidth information. A means for performing a request for bandwidth reservation system, and means for transmitting the result of the bandwidth reservation to the terminal device, and means for performing a request for bandwidth release to the bandwidth control subsystem upon release of the session. Further, in the means for requesting the content distribution subsystem to establish a session via the SIP session control subsystem, the terminal device determines whether the content distribution subsystem is compatible with SIP. In the case of SIP support, a session is established with the content distribution subsystem. In the case of no SIP support, the SIP session control subsystem simulates the session control function of the content distribution subsystem to establish the session of the terminal device. Means is provided for requesting bandwidth reservation based on bandwidth information necessary for viewing content included in the requested information.
The SIP session control subsystem of the present invention is transmitted from the content distribution subsystem when the terminal device requests the establishment of a session to the content distribution subsystem via the SIP session control subsystem. Means for receiving bandwidth information necessary for viewing content, means for requesting bandwidth reservation to the bandwidth control subsystem based on the bandwidth information, means for transmitting the bandwidth reservation result to the terminal device, and session of the terminal device There is means for requesting bandwidth release from the SIP session control subsystem to the bandwidth control subsystem when a release request is made. In addition, when the terminal device requests the content distribution subsystem to establish a session via the SIP session control subsystem, the SIP session control subsystem determines whether the content distribution subsystem is compatible with SIP, If the SIP is not compatible, the SIP session control subsystem simulates the session control function of the content distribution subsystem, and the terminal device requests the establishment of the session. Means is provided for requesting bandwidth reservation based on bandwidth information necessary for viewing the contained content.
In addition, the terminal device of the present invention obtains an address in a first address format that designates content associated with the content address management server subsystem from the content address management server subsystem, and converts the first address format into the first address format. A means for converting the SIP address designating the content distribution subsystem storing the content into an address in a second address format that specifies the content in the option field, and a response message transmitted from the content distribution subsystem Means for converting the address of the second address format included in the address into an address of the first address format, means for requesting the content distribution subsystem to establish a session via the SIP session control subsystem, and session establishment Need And means including bandwidth information required to view the content in the message, means for receiving the result of the bandwidth reservation is transmitted from the SIP session control subsystem.
In addition, the content distribution subsystem of the present invention specifies the content from the address in the second address format that specifies the content in the option field of the SIP address that specifies the content distribution subsystem that stores the content. And means for transmitting bandwidth information necessary for viewing content to the SIP session control subsystem when the terminal device requests establishment of a session to the content distribution subsystem via the SIP session control subsystem. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 is a block diagram showing a first configuration example of a QoS guarantee system in a CDN by SIP session control according to the present invention.
[0010]
As shown in FIG. 1, the system of this example includes an IP communication network 11, a terminal device 21 of a user 71, a SIP session control subsystem 31, a bandwidth control subsystem 41, a content distribution subsystem 51, and a content address. It is comprised from the management server subsystem 61, and it has shown that the terminal device 21 and subsystem 31,41,51,61 are connected to the IP communication network 11. FIG.
[0011]
Each of the terminal device 21, the SIP session control subsystem 31, the bandwidth control subsystem 41, the content distribution subsystem 51, and the content address management server subsystem 61 includes a CPU (Central Processing Unit), a main memory, and a display device. And a computer configuration including an input device, an external storage device, etc., and after the program or data recorded on the storage medium such as a CD-ROM is installed in the external storage device via the optical disk drive device, etc., this external storage The processing of each functional unit is executed by reading from the apparatus into the main memory and processing by the CPU.
[0012]
The terminal device 21 is a communication terminal device such as a PC (Personal Computer) including a SIP protocol function unit 21-4 and an application unit 21-5. The SIP protocol function unit 21-4 is a TCP (Transmission Control Protocol) or UDP (UDP). User Datagram Protocol) is software that is located in an upper layer, and transmits and receives SIP requests or SIP responses. An application unit 21-5 is an application for a terminal device that is located in an upper layer of the SIP protocol function unit 21-4.
[0013]
The terminal device 21 accesses the WWW (World Wide Web) server subsystem 61 having a content address as an electronic program guide as a content address management server subsystem by using the HTTP (Hyper Text Transfer Protocol) protocol or the like. Information such as an address in the first address format that specifies the content associated with the content by the content address management server subsystem 61 is acquired, and the content is distributed to the content distribution subsystem 51 that stores the content. Has one SIP address, and the content specification is converted to an address in the second address format specified in the option field of the SIP address, and is necessary for viewing the content in a message requesting establishment of a session. Including bandwidth information, a SIP request for requesting the establishment of a session is transmitted to the content distribution subsystem 51 via the SIP session subsystem 31 using the SIP protocol, and the bandwidth secured from the SIP session control subsystem 31 is secured. The SIP response as a result of the above is received, it is known that the bandwidth has been secured, and the conversion from the address in the second address format included in the response message transmitted from the content distribution subsystem to the address in the first address format And real-time data distribution can be controlled using the RTSP (Real Time Streaming Protocol) protocol or the like, and the content transmitted from the content distribution subsystem 51 can be viewed.
[0014]
When the user 71 finishes viewing the content, the terminal device 21 has a function of transmitting a SIP request for requesting the release of the session with the content distribution subsystem 51 via the SIP session control subsystem 31. Including.
[0015]
The content distribution subsystem 51 is a content distribution server device including a SIP protocol function unit 51-4, an application unit 51-5, and a content unit 52.
[0016]
Similar to the SIP protocol function unit 21-4, the SIP protocol function unit 51-4 is software located in an upper layer of TCP or UDP, and transmits and receives a SIP request or a SIP response. The application unit 51-5 has a SIP protocol function. This is a content distribution subsystem application located in an upper layer of the unit 51-4.
[0017]
The content unit 52 accumulates various types of content and band information necessary for viewing the content.
[0018]
When the terminal device 21 requests establishment of a session via the SIP session control device 31, the content distribution subsystem 51 transmits bandwidth information necessary for viewing the content specified by the SIP protocol to the SIP session control device 31. It is a content distribution server apparatus including the function to transmit to.
[0019]
The SIP session control subsystem 31 is a subsystem that forms the core of the present invention, and is a server device that includes the SIP protocol function unit 31-4 and the application unit 31-5. The SIP protocol function unit 31-4 includes the SIP protocol function. Similar to the unit 21-4, it is software located in the upper layer of TCP or UDP, and transmits and receives SIP requests or SIP responses. The application unit 31-5 is a SIP located in the upper layer of the SIP protocol function unit 31-4. This is an application for the session control subsystem.
[0020]
The SIP session control subsystem 31 receives bandwidth information necessary for viewing the content transmitted from the content distribution subsystem 51 at the time of establishing a session, and requests bandwidth reservation from the bandwidth control subsystem 41 using the bandwidth information. The server device includes a function of transmitting the result to the terminal device 21, requesting the bandwidth release to the bandwidth control subsystem 41 when releasing the session, and transmitting the result to the terminal device 21.
[0021]
Next, the flow of processing will be described.
[0022]
FIG. 2 is a sequence chart showing a processing example of the system in FIG.
[0023]
The operation among the content address management server subsystem 61, the terminal device 21, the bandwidth control subsystem 41, the SIP session control subsystem 31, and the content distribution subsystem 51, particularly, between SIP protocol function units is shown.
[0024]
The terminal device 21 accesses the content address management server subsystem 61 using the HTTP protocol (S11), acquires information such as the address in the first address format of the desired content (S12), and then obtains information from the first address format. 2 is transmitted to the content distribution subsystem 51 via the SIP session control subsystem 31 using the SIP protocol (S13).
[0025]
The SIP session control subsystem 31 that has received this transmits SIP-INVITE to the content distribution subsystem 51 (S14), and transmits 100Trying to the terminal device 21 (S15).
[0026]
The content distribution subsystem 51 that has received the SIP-INVITE transmits 200 OK including bandwidth information necessary for viewing the content designated by the address in the second address format to the SIP session control subsystem 31 (S16).
[0027]
The SIP session control subsystem 31 that has received 200 OK transmitted from the content distribution subsystem 51 makes a bandwidth reservation request that characterizes the present invention.
[0028]
That is, instead of immediately transmitting 200 OK to the terminal device 21, the bandwidth information is accumulated (S17), and the bandwidth control system 41 stores the address of the terminal device 21, the address of the content distribution subsystem 51, and the bandwidth information to be secured between them. A bandwidth reservation request is made (S18), and a result that can be secured is transmitted from the bandwidth control subsystem (S19), and 200OK is transmitted to the terminal device 21 for the first time (S20).
[0029]
The terminal device 21 that has received 200 OK transmits ACK to the SIP session control subsystem 31 (S21), and the SIP session control subsystem 31 transmits ACK to the content distribution subsystem 51 (S22).
[0030]
Another feature here is that, when a result that cannot be secured is transmitted from the bandwidth control subsystem 41 in response to a bandwidth reservation request, a message is sent to the terminal device 21 informing that the bandwidth could not be secured. Is to send.
[0031]
Upon receipt of the 200 OK, the terminal device 21 converts the address in the second address format that specifies the desired content included in the 200 OK message into an address in the first address format, Real-time data delivery can be controlled by the RTSP protocol for the content delivery subsystem holding the content designated by the address in one address format (S23) (S24). The transmitted content is viewed (S25).
[0032]
SIP-INVITE transmission (S14) to the content distribution subsystem for the purpose of reducing traffic in the network by making a real-time data distribution control request using the address included in the received 200 OK message Then, the destination content distribution subsystem is switched by the SIP session control subsystem or the like, and it corresponds to the destination address when the terminal device 21 transmits SIP-INVITE to request session establishment (S13). Communication is possible even when the content is changed to a mirror content distribution subsystem that is not a content distribution subsystem.
[0033]
When the content viewing ends, the terminal device 21 transmits SIP-BYE for ending the session with the content distribution subsystem 51 to the SIP session control subsystem 31 via the SIP session control subsystem 31. (S 26) The SIP session control subsystem 31 that has received this transmits SIP-BYE to the content distribution subsystem 51 (S 27), and the content distribution subsystem 51 transmits 200 OK to the SIP session control subsystem 31. (S28).
[0034]
The SIP session control subsystem 31 that has received 200 OK transmitted from the content distribution subsystem 51 makes a bandwidth release request that characterizes the present invention.
[0035]
That is, instead of immediately transmitting 200 OK to the terminal device 21, the bandwidth control system 41 is requested to release the bandwidth including the address of the terminal device 21, the address of the content distribution subsystem 51, and the bandwidth information secured between them. (S29) When the released result is transmitted from the bandwidth control subsystem 41 (S30), 200OK is transmitted to the terminal device 21 (S30).
[0036]
2 and the like in FIG. 2 correspond to the same numbers in FIG.
[0037]
FIG. 3 is an explanatory diagram showing a specific example of the address format used in the system shown in FIG.
[0038]
The terminal device 21 accesses the content address management server subsystem 61 using the HTTP protocol (S11), acquires RTSP-URI information that is an address in the first address format of the desired content (S12), Content distribution by SIP protocol including conversion of address format to SIP-URI, which is the second address format (conversion 1), including bandwidth information necessary for viewing the content in a SIP-INVITE message requesting session establishment SIP-INVITE for requesting the establishment of a session with the subsystem 51 is transmitted with the SIP-URI as the transmission destination (S13).
[0039]
Further, when the terminal device 21 receives the 200 OK, the SIP-URI, which is the second address format for specifying the content distribution subsystem included in the 200 OK message, is the first address format. It converts to RTSP-URI and requests the content distribution subsystem holding the content specified by the RTSP-URI so that real-time data distribution can be controlled by the RTSP protocol. (S23)
[0040]
3 corresponds to the same numbers in FIG. 1 and FIG.
[0041]
FIG. 4 is a flowchart for explaining a first implementation procedure example of the QoS guarantee method in the CDN by the SIP session control according to the present invention.
[0042]
The terminal device 21 of the user 71 acquires the address in the first address format from the content address management server subsystem 61 (S41), converts the first address format into the second address format, and the SIP session control subsystem 31. (S42), the content distribution subsystem 51 notifies the SIP session control subsystem 31 of bandwidth information necessary for viewing the content when the session is established (S43). ), The SIP session control subsystem 31 makes a bandwidth reservation request to the bandwidth control subsystem 41 based on the bandwidth information (S44), notifies the terminal device 21 of the result of the bandwidth reservation request (S45), and the viewer The content is viewed (S46), and after viewing, the terminal device 21 receives the SIP set. The SIP session control subsystem 31 requests the bandwidth control subsystem 41 to release the bandwidth (S48). In response to this, the SIP session control subsystem 31 requests the bandwidth control subsystem 41 to release the session (S48). ).
[0043]
FIG. 5 is a block diagram showing a second embodiment of the QoS guarantee system in the CDN by the SIP session control according to the present invention.
[0044]
The system shown in FIG. 5 includes the IP communication network 11, the terminal device 21 of the user 71, the SIP session control subsystem 35, the bandwidth control subsystem 41, the content distribution subsystems 51 and 55, and the content address management server sub. The terminal device 21 and the subsystems 35, 41, 51, 55, 61 are configured to be connected to the IP communication network 11.
[0045]
The terminal device 21, the bandwidth control subsystem 41, the content distribution subsystem 51, and the content address management server subsystem 61 are the same as those in the first embodiment in FIG.
[0046]
The content distribution subsystem 55 is a server device having a function obtained by removing the SIP protocol function unit 51-4 from the content distribution subsystem 51.
[0047]
The SIP session control subsystem 35 includes, in the application unit 31-5 of the SIP session control subsystem 31, a determination unit 36 that determines whether or not the content distribution subsystems 51 and 55 are SIP-compatible, and a session control function of the content distribution subsystem. This is a server device having a function to which a pseudo part 37 for simulating the above is added.
[0048]
When the terminal device 21 requests the content distribution subsystems 51 and 55 to establish a session, the determination unit 36 determines the address of the destination content distribution subsystems 51 and 55 in the session start request message transmitted by the terminal device 21, It is determined by comparing the address of the non-SIP compatible content distribution subsystem 55 set to “1”.
[0049]
Next, the flow of processing will be described.
[0050]
FIG. 6 is a sequence chart showing a processing example of the system in FIG.
[0051]
A process between the content address management server subsystem 61, the terminal device 21, the bandwidth control subsystem 41, the SIP session control subsystem 35, and the content distribution subsystem 55, particularly, between SIP protocol function units is shown.
[0052]
The processing between the SIP session control subsystem 35 and the content distribution subsystem 51 is the same as that in the first embodiment of FIG.
[0053]
In the sequence shown in FIG. 6, since the content distribution subsystem 55 does not have a SIP-compatible function, steps 14, 16, 22, 27, and 28 corresponding to the SIP protocol are performed in accordance with the SIP session control sub. The pseudo part 38 of the system 35 corresponds to the steps 14a, 16a, 22a, 27a, and 28a.
[0054]
FIG. 7 is a flowchart showing a processing procedure example of the QoS guarantee method by the system in FIG.
[0055]
In contrast to the example illustrated in FIG. 4, in the procedure in which the terminal device 21 requests the content distribution subsystems 51 and 55 to establish a session, the SIP session control subsystem 35 receives the destination content in the session start request message from the terminal device 21. There is provided a step of determining whether or not the content distribution subsystems 51 and 55 are compatible with the SIP by comparing the addresses of the distribution subsystems 51 and 55 with the addresses of the content distribution subsystems 55 that are not set to SIP in advance. It is that you are.
[0056]
The terminal device 21 of the user 71 acquires the address of the content from the content address management server subsystem 61 (S41), and requests establishment of a session with the content distribution subsystems 51 and 55 via the SIP session control subsystem 35. (S42) In the SIP session control subsystem 35, the determination unit 36 determines whether the content distribution subsystems 51 and 55 are compatible with SIP (S42a).
[0057]
If not, the pseudo part 37 of the SIP session control subsystem 35 simulates the session control function of the content distribution subsystem 55 (S42b), and the SIP session control subsystem 35 allows the terminal device 21 to establish the session. Band information necessary for viewing the content included in the SIP-INVITE message at the time of request is stored. If it is compatible, the bandwidth information necessary for viewing the content transmitted by the content distribution subsystem is received and stored as in the first embodiment.
[0058]
Similarly, the SIP session control subsystem 35 makes a bandwidth reservation request to the bandwidth control subsystem 41 based on the bandwidth information (S44), receives the result of the bandwidth reservation request, notifies the terminal device 21 (S45), and The user views the content (S46), and the terminal device 21 after viewing requests the release of the session with the content distribution subsystem via the SIP session control subsystem 35 (S47), and the SIP session control subsystem 35 Similarly to the session establishment request, when the terminal device 21 requests the session release, the addresses of the destination content distribution subsystems 51 and 55 in the session release request message transmitted by the terminal device 21 are set in advance. Check the address of non-SIP compatible content distribution subsystem 55 Luke, or by the session identifier stored at session start request, the content distribution subsystem 51, 55 determines whether or not the SIP-enabled there (S47a).
[0059]
If there is no SIP support, the pseudo part 37 of the SIP session control subsystem 35 simulates the session control function of the content distribution subsystem 55 (S47b), and accordingly, the SIP session control subsystem 35 sends a bandwidth to the bandwidth control subsystem 41. A release request is made (S48).
[0060]
If the SIP is supported, the SIP session control subsystem 35 requests the bandwidth control subsystem 41 to release the bandwidth as in FIG.
[0061]
FIG. 8 is a block diagram showing a configuration example of the SIP session control subsystem in FIG.
[0062]
The SIP session control subsystem 31 shown in FIG. 8 includes a network interface unit 31-1, which interfaces with the IP communication network 11, an Internet unit 31-2, a transport unit 31-3, and a SIP protocol function unit 31-. 4 and an application unit 31-5.
[0063]
The application unit 31-5 includes a proxy unit 32 and a bandwidth control subsystem corresponding unit 33. The SIP protocol function unit 31-4 transmits / receives a SIP request or a SIP response from a terminal device or the like. The proxy unit 32 processes the SIP request and performs proxy transmission to another terminal device or the like.
[0064]
The bandwidth control subsystem corresponding unit 33 stores bandwidth information necessary for viewing the content transmitted from the content distribution subsystem 51 in the bandwidth information storage unit 33-1 when the session is established. A bandwidth reservation request is sent to the bandwidth control subsystem 41 when the session is released.
[0065]
FIG. 9 is a flowchart showing an operation example of the SIP session control subsystem in FIG.
[0066]
The example of FIG. 9 shows an operation flow mainly using the SIP protocol function unit 31-4, which is a feature of the present invention. When the viewer terminal device 21 requests establishment of a session (S101). The SIP session control subsystem 31 transmits a SIP request (INVITE) to the content distribution subsystem 51 (S102), and receives information on the bandwidth necessary for viewing the content transmitted from the content distribution subsystem 51. Accumulate (S103), request bandwidth reservation to bandwidth control subsystem 41 in bandwidth control subsystem corresponding unit 33 (104), receive bandwidth reservation result transmitted from bandwidth control subsystem 41, and use SIP protocol function The data is transmitted from the unit 31-4 to the terminal device 21 (S105).
[0067]
When the viewer 71 finishes viewing the content, the terminal device 21 of the viewer 71 issues a session release request (S106), whereby the SIP session control subsystem 31 sends a SIP request ( BYE) is transmitted (S107), and the bandwidth control subsystem corresponding unit 33 requests the bandwidth control subsystem 41 to release the bandwidth (S108).
[0068]
FIG. 10 is a configuration diagram showing a configuration example of the SIP session control subsystem in FIG.
[0069]
The SIP session control subsystem 35 shown in FIG. 10 includes a network interface unit 35-1, which interfaces with the IP communication network 11, an Internet unit 35-2, a transport unit 35-3, and a SIP protocol function unit 35-4. And the application unit 35-5. The application unit 35-5 indicates that it includes a determination unit 36, a pseudo unit 37, a proxy unit 38, and a bandwidth control subsystem corresponding unit 39, and the configuration example of the first embodiment in FIG. The difference is that the determination unit 36 and the pseudo unit 37 are provided.
[0070]
The determination unit 36, when the terminal device 21 requests the content distribution subsystems 51 and 55 to establish a session, the address of the destination content distribution subsystems 51 and 55 in the session start request message transmitted by the terminal device 21, and The pseudo unit 37 has a function of determining whether or not the content distribution subsystems 51 and 55 are SIP-compatible by checking the addresses of the SIP non-compliant content distribution subsystems 51 and 55 set in advance. A function for programmatically simulating the session control function of the content distribution subsystem 55 in a series of communication sequences when the content distribution subsystem holding the content of the destination address when requesting the establishment of a session is not SIP-compliant have.
[0071]
By having the determination unit 36 and the pseudo unit 37, the SIP protocol function unit 35-4 can have the same configuration as the SIP function unit 32 of FIG.
[0072]
FIG. 11 is a flowchart showing an operation example of the SIP session control subsystem in FIG.
[0073]
An operation flow mainly including the SIP protocol function unit 35-4, which is a feature of the present invention, is shown.
[0074]
In this example, in contrast to the example of FIG. 9, in the procedure in which the terminal device 21 requests the content distribution subsystems 51 and 55 to establish a session, the SIP session control subsystem 35 receives the incoming call in the session start request message from the terminal device 21. The presence / absence of SIP of the destination content distribution subsystems 51 and 55 is determined by comparing the address of the destination content distribution subsystems 51 and 55 with the address of the non-SIP compatible content distribution subsystem 55 set in advance. Steps are provided.
[0075]
When the viewer terminal device 21 requests establishment of a session (S101), the SIP session control subsystem 35 determines whether or not the content distribution subsystems 51 and 55 are compatible with SIP (S101a).
[0076]
If not supported (content distribution subsystem 55), the pseudo part 37 of the SIP session control subsystem 35 simulates the session control function of the content distribution subsystem 55 (S101b). In addition, the session control subsystem 31 makes a request for bandwidth reservation to the bandwidth control subsystem 41 based on information on the bandwidth necessary for viewing the content included in the information when the terminal device 21 requests establishment of the session. .
[0077]
If it is compatible (content distribution subsystem 51), the SIP session control subsystem 35 transmits a SIP request (INVITE) to the content distribution subsystem 51 as in the first embodiment (S102). Receives and accumulates information on the bandwidth necessary for viewing the content transmitted from the system 51 (S103), and requests bandwidth reservation to the bandwidth control subsystem 41 in the bandwidth control subsystem corresponding unit 39 (S104), The bandwidth reservation result transmitted from the bandwidth control subsystem 41 is received and transmitted from the SIP protocol function unit 35-4 to the terminal device 21 (S105).
[0078]
When the viewer finishes viewing the content, the viewer terminal device 21 makes a session release request (S106), so that the SIP session control subsystem 35 performs the terminal device 21 in the same manner as when the session establishment request is made. When requesting the release of the session, the address of the destination content delivery subsystems 51 and 55 in the session release request message transmitted by the terminal device 21 and the address of the non-SIP compatible content delivery subsystem 55 set in advance are set. It is determined whether the destination content distribution subsystem is SIP-compatible by comparing with each other or by referring to the session identifier accumulated at the time of session start request (S106a). Pseudo part 3 of control subsystem 35 Simulates the session control function of the content distribution subsystem 55 (S106b), and if it is compatible, a SIP request (BYE) is transmitted to the content distribution subsystem 51 as in the first embodiment (S107). In both cases, the bandwidth control subsystem corresponding unit 39 requests the bandwidth control subsystem 41 to release the bandwidth (S108).
[0079]
FIG. 12 is a block diagram illustrating a configuration example of the terminal device in FIG.
[0080]
The terminal device 21 of this example includes a network interface unit 21-1, which interfaces with the IP communication network 11, an Internet unit 21-2, a transport unit 21-3, a SIP protocol function unit 21-4, and an application unit. 21-5.
[0081]
The application unit 21-5 includes an address conversion unit 22, a band securing result information storage unit 23, a content address management server subsystem correspondence unit 24, and a content viewing correspondence unit 25.
[0082]
In the content address management server subsystem corresponding unit 24, the address in the first address format is acquired from the content address management server subsystem 61 in the address format for specifying the content associated with the content address management server subsystem 61, and the address conversion is performed. The unit 22 converts the address in the first address format into an address in the second address format that specifies the content in the option field of the SIP address designating the content distribution subsystem storing the content (content And also has a function of converting from the second address format included in the response message transmitted from the delivery subsystem to the first address format), and the content delivery service via the SIP session control subsystem. Used when requesting to establish a session on the system.
[0083]
Bandwidth securing result information accumulating unit 23 accumulates bandwidth securing result information transmitted from SIP session control subsystem 31 to determine whether to view content and to determine the behavior of the terminal device thereafter. It can be used as information. The content viewing support unit 25 performs content viewing support.
[0084]
When the viewer finishes viewing the content, the viewer's terminal device 21 makes a session release request.
[0085]
FIG. 13 is a flowchart illustrating an operation example of the terminal device in FIG.
[0086]
FIG. 13 shows an operation flow mainly using the SIP protocol function unit 21-4, which is a feature of the present invention.
[0087]
The address of the first address format is acquired from the content address management server subsystem 61 in the content address management server subsystem corresponding unit 24 (S121), and the address conversion unit 22 converts the address from the first address format to the second address format. (S122), the content distribution subsystem is requested to establish a session using the address in the second address format via the SIP session control subsystem (S123), and the bandwidth secured from the SIP session control subsystem 31 is secured. The result information storage unit 23 for securing the bandwidth stores the result information (S124).
[0088]
When viewing the content, the address conversion unit 22 converts the address in the second address format into the address in the first address format (S125), the content viewing support unit 25 accesses the content distribution subsystem, and the content The content sent from the distribution subsystem is viewed (S126).
[0089]
When the viewer finishes viewing the content, the terminal device 21 of the viewer requests the content distribution subsystem to release the session via the SIP session control subsystem 31 (S127).
[0090]
FIG. 14 is a block diagram illustrating a configuration example of the content distribution subsystem in FIG.
[0091]
In FIG. 14, the content distribution subsystem 51 includes a network interface unit 51-1 that interfaces with the IP communication network 11, an Internet unit 51-2, a transport unit 51-3, and a SIP protocol function unit 51-4. The application unit 51-5. The application unit 51-5 includes a content unit (including band information) 52 and an address corresponding unit 53.
[0092]
The SIP protocol function unit 51-4 transmits / receives a SIP request or a SIP response from a terminal device or the like.
[0093]
The content unit 52 stores the content, and the address correspondence unit 53 has a function of specifying the content from the SIP-URL with an option field, which is an address in the second address format.
[0094]
FIG. 15 is a flowchart showing an operation example of the content distribution subsystem in FIG.
[0095]
In this example, an operation flow mainly including the SIP protocol function unit 51-4 which is a feature of the present invention is shown.
[0096]
A SIP request (INVITE) transmitted from the SIP session control subsystem 31 when the terminal device 21 of the viewer requests the content distribution subsystem to establish a session via the SIP session control subsystem 31 (S141). (S142), the content is specified from the address of the second address format included therein (S143), information on the band necessary for viewing the corresponding content is extracted from the content unit 52, and the SIP session control subsystem A SIP response message (200 OK, etc.) is transmitted to 31 (S144).
[0097]
The content is streamed by accessing the viewing request from the terminal device (S145).
[0098]
When the viewer finishes viewing the content, the terminal device 21 of the viewer makes a session release request to the content distribution subsystem via the SIP session control subsystem 31 (S146). The SIP request (BYE) to be transmitted is received (S147), and a SIP response message (200 OK, etc.) is transmitted.
[0099]
As described above with reference to FIGS. 1 to 15, this example is characterized in that the SIP protocol is applied between the user terminal device and the network side device in the content distribution network. The SIP protocol is an indispensable protocol for realizing a communication service between user terminal devices in an IP communication network. By applying this protocol, a content distribution network facility and a user terminal device are provided on the same IP communication network. The system can be used in common with the equipment that realizes the communication service between them, so that a highly versatile and economical system can be constructed.
[0100]
For example, the terminal device 21 acquires a first address in an address format for designating the content associated in the content address management server subsystem 61 from the content address management server subsystem 61, and uses the first address format. A function of converting the SIP address designating the content distribution subsystem 51 storing the content into the second address format in the address format for specifying the content in the option field, and the content distribution subsystem 51 A function of converting from the second address format included in the response message to the first address format, a function of requesting the content distribution subsystem 51 to establish a session via the SIP session control subsystem 31, A content distribution subsystem 51 having a function of including bandwidth information necessary for content viewing in a message requesting establishment and a function of receiving a bandwidth reservation result transmitted from the SIP session control subsystem 31. 2 has a function of specifying the content from the address format of 2 and a function of transmitting information of a band necessary for viewing the content to the SIP session control subsystem 31 when a session is established. The SIP session control subsystem 31 includes: A function of receiving bandwidth information necessary for viewing the content transmitted from the content distribution subsystem 51 when a session is established, a function of requesting bandwidth reservation to the bandwidth control subsystem 41 using this bandwidth information, and this bandwidth The result of the bandwidth reservation by the control subsystem 41 is shown as the terminal device 21. A function of transmitting, are configured to include a function of performing a request for bandwidth release to the bandwidth control subsystem 41 upon release of the session.
[0101]
Note that the SIP session control subsystem 31 simulates the function of determining whether or not the content distribution subsystem is compatible with SIP and the function of controlling the session of the content distribution subsystem 55 when the SIP is not compatible. Has a function of requesting the bandwidth reservation to the bandwidth control subsystem 41 based on the bandwidth information necessary for viewing the content included in the information when the establishment of the session is requested.
Note that the present invention is not limited to the examples described with reference to FIGS. 1 to 15, and various modifications can be made without departing from the scope of the invention. For example, in this example, the content address management server has been described as a WWW server, but the present invention is not limited to a WWW server.
[0103]
In addition, each subsystem of this example is not limited to a device with a separate housing as a device mounting.
[0104]
In this example, the RTSP protocol has been described as the streaming control protocol. However, the address format in which the content to be viewed is uniquely identified and the content distribution subsystem holding the content is also uniquely identified. Other control protocols may be used, and are not limited to the RTSP protocol.
[0105]
【The invention's effect】
According to the present invention, (1) the bandwidth of the network is secured only when the user views the content, so that high-quality content viewing can be realized using the network resources effectively on the network where QoS is guaranteed. .
[0106]
(2) Even if the content distribution server subsystem is not equipped with the SIP protocol, high-quality content viewing is possible as in (1) above, provided that the user terminal device is equipped with a SIP-compatible viewing application. become.
[0107]
(3) Since the signal between the user's terminal device and the network is not a unique signal but is distributed according to a standard protocol defined by RFC (Request For Comment), it is easy to implement and scalable.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first configuration example of a QoS guarantee system in a CDN by SIP session control according to the present invention.
FIG. 2 is a sequence chart showing a processing example of the system in FIG.
FIG. 3 is an explanatory diagram showing a specific example of address format conversion used in the system in FIG. 1;
FIG. 4 is a flowchart illustrating a procedure example in a first configuration example of a QoS guarantee method in a CDN by SIP session control according to the present invention.
FIG. 5 is a block diagram showing a second configuration example of the QoS guarantee system in the CDN by the SIP session control according to the present invention.
6 is a sequence chart showing a processing example of the system in FIG. 5. FIG.
7 is a flowchart showing a processing procedure example of a QoS guarantee method by the system in FIG. 5;
FIG. 8 is a block diagram showing a configuration example of a SIP session control subsystem in FIG. 1;
FIG. 9 is a flowchart showing an operation example of the SIP session control subsystem in FIG. 8;
10 is a block diagram showing a configuration example of a SIP session control subsystem in FIG. 5. FIG.
FIG. 11 is a flowchart showing an operation example of the SIP session control subsystem in FIG. 10;
12 is a block diagram illustrating a configuration example of a terminal device in FIG. 1. FIG.
FIG. 13 is a flowchart showing an operation example of the terminal device in FIG. 12;
14 is a block diagram showing a configuration example of a content distribution subsystem in FIG. 1. FIG.
FIG. 15 is a flowchart showing an operation example of the content distribution subsystem in FIG. 14;
[Explanation of symbols]
11: IP communication network
21: Terminal device
21-4, 31-4, 35-4, 51-4: SIP protocol function unit
21-5, 31-5, 35-5, 51-5, 55-5: Application section
22: Address converter
23: Bandwidth securing result information storage unit
24: Content address management server subsystem corresponding part
25: Content viewing support section
31, 35: SIP session control subsystem
32, 38: Proxy part
33, 39: Band control subsystem corresponding part
36: Determination unit
37: Pseudo part
41: Bandwidth control subsystem
51, 55: Content distribution subsystem
52, 56: Content part
53: Address corresponding part
61: Content address management server subsystem
71: User

Claims (15)

  1. A QoS guarantee method in a CDN by SIP session control using an IP network,
    A first procedure for requesting establishment of a session prior to viewing of the content from the content distribution subsystem and the content via the SIP session control subsystem from a terminal device that requests viewing of the content;
    A second procedure for notifying the SIP session control subsystem of information on a bandwidth necessary for viewing the content from the content distribution subsystem when the session is established;
    A third procedure for requesting bandwidth reservation from the SIP session control subsystem to the bandwidth control subsystem using bandwidth information notified from the content distribution subsystem;
    A fourth procedure for notifying the terminal device of the result of bandwidth reservation in the bandwidth control subsystem from the SIP session control subsystem;
    A fifth procedure for requesting the SIP session control subsystem from the terminal device to release the session after viewing the content;
    And a sixth procedure for making a bandwidth release request from the SIP session control subsystem to the bandwidth control subsystem in response to the session release request from the terminal device. QoS guarantee method.
  2. In the QoS guarantee method in CDN by SIP session control of Claim 1,
    In the first procedure, the SIP session control subsystem determines whether or not the content distribution subsystem is compatible with SIP. If the SIP is compatible, the SIP session control subsystem establishes a session with the content distribution subsystem. In the case of no correspondence, the SIP session control subsystem simulates the session control function of the content distribution subsystem, and when requesting bandwidth reservation from the SIP session control subsystem to the bandwidth control subsystem, the terminal device QoS guarantee method in CDN by SIP session control using bandwidth information included in request message for session establishment of
  3. A QoS guarantee method in a CDN by SIP session control according to claim 1, wherein:
    QoS guarantee in CDN by SIP session control, wherein the content is specified by the terminal device in a SIP address specifying the content distribution subsystem storing the content in an option field of the SIP address Method.
  4. A QoS guarantee method in a CDN by SIP session control according to claim 1, comprising:
    A procedure for acquiring an address of the content from a content address management server subsystem in the terminal device and specifying a content distribution subsystem that requests establishment of the session based on the address;
    The first address format in which the content is specified from the content address management server subsystem is the address format for specifying the content in the option field of the SIP address that specifies the content distribution subsystem storing the content. A method for guaranteeing QoS in a CDN by SIP session control, comprising the step of converting to a second address format by
  5.   The program for making a computer perform each procedure in the QoS guarantee method in CDN by SIP session control in any one of Claims 1-4.
  6. A QoS guarantee system in a CDN by SIP session control using an IP network,
    A terminal device that requests viewing of content, a content distribution subsystem that stores and distributes content, a content address management subsystem that manages storage destination addresses of content, a SIP session control subsystem that performs SIP session establishment control, and bandwidth control A bandwidth control subsystem;
    The terminal device obtains an address in a first address format for designating the content associated in the content address management server subsystem from the content address management server subsystem, and the first address format is Means for converting the SIP address designating the content distribution subsystem storing the content into a second address format according to the address format specifying the content in the option field, and a response message transmitted from the content distribution subsystem Means for converting from the second address format included in the first address format to the first address format; means for requesting the content distribution subsystem to establish a session via the SIP session control subsystem; and And means including bandwidth information required to view the content in the message requesting a standing, and means for receiving the result of the bandwidth reservation is transmitted from the SIP session control subsystem,
    The content distribution subsystem includes means for specifying the content from an address in the second address format, and means for transmitting information on a band necessary for viewing the content to the SIP session control subsystem when the session is established. And
    The SIP session control subsystem is configured to receive bandwidth information necessary for viewing the content transmitted from the content distribution subsystem when the session is established, and to reserve bandwidth to the bandwidth control subsystem based on the bandwidth information. Means for requesting the bandwidth control, means for transmitting the result of bandwidth reservation by the bandwidth control subsystem to the terminal device, and means for requesting bandwidth release to the bandwidth control subsystem when the session is released. The QoS guarantee system in CDN by SIP session control characterized.
  7. A QoS guarantee system in a CDN with SIP session control according to claim 6,
    The SIP session control subsystem simulates the session distribution function of the content distribution subsystem by means for determining whether or not the content distribution subsystem is compatible with SIP, and when the SIP is not compatible, By means of SIP session control, comprising means for requesting the bandwidth reservation to the bandwidth control subsystem based on bandwidth information necessary for viewing the content included in the information when the establishment of the session is requested QoS guarantee system in CDN.
  8.   The program for functioning a computer as each means in the QoS guarantee system in CDN by SIP session control in any one of Claim 6 or Claim 7.
  9. A terminal device that requests viewing of content, a content distribution subsystem that stores and distributes content, and a bandwidth control subsystem that performs bandwidth control, provided in a system that guarantees QoS in a CDN by SIP session control using an IP network is, from the terminal device, accept the request for establishing the SIP session between the content distribution subsystem prior to viewing of the content, the SIP session control with means for performing a SIP session establishment request to the content distribution subsystem A subsystem,
    Means for receiving, from the content distribution subsystem, information on a band necessary for viewing the content when establishing the SIP session ;
    Means for requesting bandwidth reservation to the bandwidth control subsystem according to the bandwidth information;
    Means for transmitting a result of bandwidth reservation by the bandwidth control subsystem to the terminal device;
    Depending on the release request of the SIP session from the terminal device, for the above bandwidth control subsystem, the SIP session control subsystem, characterized in that it comprises means for performing a request for bandwidth release regarding the bandwidth reserved.
  10. The SIP session control subsystem according to claim 9,
    It is determined whether or not the content distribution subsystem of the SIP session establishment request destination is SIP-compliant. If the SIP correspondence is established, the session is established. Means for making a bandwidth reservation request to the bandwidth control subsystem based on bandwidth information necessary for viewing the content included in the information when the terminal device requests the establishment of the session. SIP session control subsystem characterized by the above.
  11.   The program for functioning a computer as each means in the SIP session control subsystem in any one of Claim 9 or Claim 10.
  12. A content distribution subsystem for storing and distributing content, a content address management subsystem for managing a storage destination address of content , a SIP session control subsystem according to any one of claims 9 and 10 , and bandwidth control for performing bandwidth control A terminal device having a subsystem, connected to a system that guarantees QoS in a CDN by SIP session control using an IP network, and receiving content from the content distribution subsystem;
    Get the luer dress by the first address format for specifying the content from the content address management server subsystem, the address of the address format of the first, designating the content distribution subsystem stores the content means for converting the SIP address, the second address format by the luer dress identifying the content in optional fields,
    Means for converting an address in the second address format included in the response message transmitted from the content distribution subsystem into an address in the first address format;
    Means for requesting the content delivery subsystem to establish a session via the SIP session control subsystem;
    Means for including bandwidth information necessary for viewing the content in a message requesting establishment of the session;
    Terminal equipment, characterized in that it comprises means for receiving the result of the bandwidth reservation is transmitted from the SIP session control subsystem.
  13.   The program for functioning a computer as each means in the terminal device of Claim 12.
  14. 12. The SIP session control subsystem according to claim 9 or 10, and a bandwidth control subsystem for performing bandwidth control, connected to a system for guaranteeing QoS in a CDN by SIP session control, In a content distribution subsystem that distributes content requested from the terminal device described above via the SIP session control subsystem,
    Means for specifying the content to be distributed from an address in the second address format specified in the option field of the SIP address; means for transmitting bandwidth information necessary for viewing the content to the SIP session control subsystem; A content distribution subsystem comprising:
  15.   The program for functioning a computer as each means in the content delivery subsystem of Claim 14.
JP2003176567A 2003-06-20 2003-06-20 QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control Active JP3922575B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003176567A JP3922575B2 (en) 2003-06-20 2003-06-20 QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003176567A JP3922575B2 (en) 2003-06-20 2003-06-20 QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control

Publications (2)

Publication Number Publication Date
JP2005012655A JP2005012655A (en) 2005-01-13
JP3922575B2 true JP3922575B2 (en) 2007-05-30

Family

ID=34099423

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003176567A Active JP3922575B2 (en) 2003-06-20 2003-06-20 QoS guarantee method, QoS guarantee system, terminal device, content distribution subsystem, SIP session control subsystem and program in CDN by SIP session control

Country Status (1)

Country Link
JP (1) JP3922575B2 (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2378737A1 (en) 2004-12-09 2011-10-19 Qualcomm Incorporated Methods and apparatus for creation and transport of multimedia content flows to a distribution network
US7912457B2 (en) * 2004-04-21 2011-03-22 Qualcomm Incorporated Methods and apparatus for creation and transport of multimedia content flows
CN1870635B (en) * 2005-10-18 2010-11-10 华为技术有限公司 Service quality authorization method
WO2008035398A1 (en) 2006-09-19 2008-03-27 Nec Corporation Content delivery system, bandwidth control intermediate device, and bandwidth control method
JP2008153896A (en) * 2006-12-15 2008-07-03 Nec Corp Content distribution system, content server side user terminal, content client side user terminal and authentication method of content distribution system
JP4984917B2 (en) * 2007-01-26 2012-07-25 日本電気株式会社 Multicast communication system and method
CN101595695B (en) * 2007-01-26 2012-11-14 日本电气株式会社 Video distribution system and video distribution method
JP4844425B2 (en) * 2007-02-15 2011-12-28 ソニー株式会社 Bandwidth request system, bandwidth request apparatus, client device, bandwidth request method, content reproduction method, and program
WO2009035030A1 (en) 2007-09-12 2009-03-19 Nec Corporation Communication system, communication optimizing apparatus and communication network establishing method used in them
JP5012397B2 (en) * 2007-10-16 2012-08-29 日本電気株式会社 Communication system, method, apparatus, and program
JP5019225B2 (en) * 2008-01-08 2012-09-05 日本電気株式会社 Gateway device, communication connection method thereof, computer program, network system
DK2248324T3 (en) * 2008-02-20 2019-01-07 Nabto Aps Procedure and system to provide connectivity between clients connected to the internet.
US8159941B2 (en) * 2008-08-28 2012-04-17 Alcatel Lucent In-band DPI media reservation modifications to RFC 3313
US8032589B2 (en) * 2008-10-27 2011-10-04 Telefonaktiebolaget L M Ericsson (Publ) Methods and systems for resuming, transferring or copying a multimedia session
EP2184894B1 (en) * 2008-11-05 2013-08-07 Alcatel Lucent Distributed resource management in networks
US9769427B2 (en) * 2008-11-18 2017-09-19 Nec Corporation Content delivery system
JP5066538B2 (en) * 2009-01-26 2012-11-07 アンリツ株式会社 Packet relay apparatus and packet relay method
JP2010288216A (en) * 2009-06-15 2010-12-24 Nippon Telegr & Teleph Corp <Ntt> Content distribution method and content distribution system
US8433814B2 (en) * 2009-07-16 2013-04-30 Netflix, Inc. Digital content distribution system and method
EP2590396B1 (en) 2010-07-02 2018-08-08 Sony Interactive Entertainment Inc. Information processing system and information processing method
CA2807869C (en) * 2010-08-10 2017-12-12 Telefonaktiebolaget L M Ericsson (Publ) Session control for media stream transmission
JP5196055B2 (en) * 2012-06-06 2013-05-15 日本電気株式会社 Communication apparatus and communication method
JP5833611B2 (en) * 2013-09-24 2015-12-16 株式会社ソニー・コンピュータエンタテインメント Communication management device, terminal, communication management system, communication management method, program, and information storage medium
JP6482413B2 (en) * 2015-07-01 2019-03-13 テレフオンアクチーボラゲット エルエム エリクソン(パブル) Session control for media stream transmission
JP6612313B2 (en) * 2017-12-20 2019-11-27 テレフオンアクチーボラゲット エルエム エリクソン(パブル) Session control for media stream transmission

Also Published As

Publication number Publication date
JP2005012655A (en) 2005-01-13

Similar Documents

Publication Publication Date Title
EP1635532B1 (en) Methods and apparatuses for transferring data
CN1913533B (en) Remote video monitoring system based on session initialize protocol and its implementing method
US8332527B2 (en) Streaming media network system, streaming media service realization method and streaming media service enabler
KR100965950B1 (en) Terminal device, data transmission-reception system and data transmission-reception initiation method
CN101573943B (en) Media Channel Management
US20100083329A1 (en) Apparatus, method and system for selecting and configuring internet content for bypass encapsulation within a bypass architecture
US20020023165A1 (en) Method and apparatus for encoder-based distribution of live video and other streaming content
KR20100126789A (en) Sip-http application correlator
EP2071838A1 (en) A system, device and method of suppoting ims terminals to share iptv services
US8560729B2 (en) Method and apparatus for the adaptation of multimedia content in telecommunications networks
JP2007536796A (en) Fast startup for streaming media
JP4261579B2 (en) Dynamic media authorization in mobile networks
JP2008160199A (en) Ip broadcasting system and multi-cast group management device for ip broadcasting
EP0956686B1 (en) Automatic detection of protocols in a network
JP2005295467A (en) Media distribution device
JP2007523540A (en) Experience quality metrics timing
US20030079020A1 (en) Method, system and service provider for IP media program transfer-and-viewing-on-demand
US7761585B2 (en) Techniques for automatically detecting protocols in a computer network
US20120110120A1 (en) Methods and Devices for Media Description Delivery
Liu et al. Rate adaptation for dynamic adaptive streaming over HTTP in content distribution network
EP2036350B1 (en) Media channel management
CN101026616B (en) Multimedia subsystem based interactive media session establishing system and method
KR100759954B1 (en) Method for signaling client rate capacity in multimedia streaming
US20040184432A1 (en) Method for controlling streaming services
US20120023530A1 (en) Content location method and content delivery network node

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20041215

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061027

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20061226

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070202

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070215

R150 Certificate of patent (=grant) or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110302

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110302

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120302

Year of fee payment: 5

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130302

Year of fee payment: 6

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350