KR20150002221A - Method and appratus for prventing duplicated transmission under streaming service - Google Patents

Abstract

Provided are a pending contents table (PCT) apparatus and a method thereof for preventing the duplicated transmission of streaming content. The method includes the steps of: determining whether to request content corresponding to a streaming request to a content providing server in case of receiving the streaming request from a terminal; reserving the transmission of the streaming request to the content providing server in case of requesting the content to the content providing server; transmitting the streaming request to the content providing server in case the content is not requested to the content providing server; determining the transmission method of the content to the terminal which requests the content in case of receiving the content from the content providing server; and transmitting the content to the terminal which requests the content according to a determined transmission method.

Description

Technical Field [0001] The present invention relates to a method and apparatus for preventing duplicated transmission in a streaming service,

The present invention relates to a method and apparatus for preventing a duplicated streaming service from being provided for a duplicated streaming service request when a plurality of duplicated streaming service requests are made in a streaming service.

Recently, according to the rapid development of terminals such as a smart phone and a tablet PC (personal computer), a terminal capable of wireless voice communication and information exchange has become a necessity of life. However, as the technology is developed and the wireless Internet is introduced, the terminal performs functions such as schedule management, game, remote control, and image shooting from a mobile device capable of simply making a wireless call. And it meets the needs of the users.

In particular, the video traffic of the mobile network accounts for about 70% of the total traffic of the mobile network, and the amount of the total traffic is also steadily increasing. Moreover, video traffic in the entire network traffic as well as the mobile network is also rapidly increasing. If the trend of video traffic is the same today, video traffic in 2016 is expected to exceed 50% of the total network.

In particular, recently, as the network usage of the terminal increases, the amount of video streaming service for receiving video traffic and reproducing video in real time is increasing.

As a result, the number of contents for the video streaming service has been explosively increased, and the number of requests for the content has also been explosively increased. In addition, this phenomenon is further worsened due to the spread of terminals. When a plurality of terminals request the same popular streaming contents in the LTE network, the number of duplicate contents requests for the one streaming contents is equal to the number of terminals, Thereby causing duplicate traffic in the backbone network. This causes three problems.

First, it increases the burden on the content service provider. If a large number of users are concentrated in the video streaming service server in the same time zone, the service provider has to increase the server's cost and increase maintenance cost for service efficiency. In addition, since this is a part that can not be increased in real time, the burden is further increased because it has to be increased in advance according to the demand of the user.

Second, maintenance and repair costs increase due to excessive traffic growth in the backbone Internet network. Due to the increase in video technology, the quality of video contents is becoming more and more evident and the size of video contents is also increasing. Accordingly, as more and more requests for duplicate content are made, more traffic than ever before flows through the Internet backbone network, which is a burden on the Internet network operator.

Third, maintenance and repair costs due to increased traffic within the LTE wireless network increase. Duplicate video content requests increase not only the backbone Internet network but also the traffic inside the LTE wireless network. Since the content of the duplicated video in the external Internet network is the content requested in the mobile device, the traffic in the wireless network also increases. Accordingly, maintenance and repair costs of the wireless network network increase.

Accordingly, a need exists for a method and apparatus for preventing duplicated streaming service provision for duplicated streaming service requests.

Accordingly, an embodiment of the present invention provides a method and apparatus for preventing duplicate transmission in a streaming service.

Another embodiment of the present invention is to provide a method and apparatus for reducing a load on a network by processing a duplicate content request as a single content request when a plurality of terminals request duplicated contents.

Another embodiment of the present invention provides a method and apparatus for reducing the load on a network by transmitting the duplicated contents to a corresponding terminal in a multicast manner when a plurality of terminals request duplicated contents.

Another embodiment of the present invention is to provide a method and apparatus for determining an efficient method among a unicast method or a multicast method and transmitting the content in a determined manner in the case of transmitting duplicated contents to a plurality of terminals.

According to an embodiment of the present invention, a method of a PCT apparatus for preventing duplicated transmission of streaming contents is provided. The method includes the steps of determining whether a content corresponding to the streaming request has been requested to a content providing server when a streaming request is received from the terminal, and transmitting the streaming request to the content providing server when the content providing server requests the content. And transmitting the streaming request to the content providing server when the content is not requested to the content providing server; and when the content is received from the content providing server, And transmitting the content to the terminal that requested the content according to the determined transmission method.

According to an embodiment of the present invention, a PCT apparatus is provided for preventing duplication of streaming contents. Wherein the apparatus determines whether the content corresponding to the streaming request is requested by the content providing server when the streaming request is received from the transmitting and receiving unit for transmitting and receiving a signal and the streaming request from the terminal, A duplication management unit for suspending transmission of the streaming request to the server and for transmitting the streaming request to the content providing server when the content is not requested to the content providing server; And an efficiency management unit for determining a transmission mode of the content to the terminal that requested the content, and the redundancy management unit transmits the content to the terminal that requested the content according to the determined transmission method.

According to an embodiment of the present invention, a method of a base station apparatus for preventing duplicated transmission of streaming contents is provided. The method includes receiving a streaming request from a terminal, including a base station ID of a base station to which the terminal requesting the streaming is included in the streaming request, network information of the base station, and a base station ID of a base station to which the terminal requesting the streaming belongs, And transmitting the streaming request including the network resource of the base station to the network device.

According to an embodiment of the present invention, a base station apparatus is provided for preventing duplicated transmission of streaming contents. The apparatus includes a transmitting / receiving unit for transmitting / receiving a signal and a streaming request from the terminal, and includes the base station ID of the base station to which the terminal requesting the streaming belongs and the network information of the base station in the streaming request, And a controller for transmitting the streaming request including the base station ID of the base station and the network resource of the base station to the network device.

The present invention is advantageous in that, when a plurality of terminals request duplicated contents, the redundant contents request can be processed as a single contents request, thereby reducing the load on the network.

The present invention is advantageous in that, when a plurality of terminals request duplicated contents, the duplicated contents are transmitted to the corresponding terminals in a multicast manner to reduce the load on the network.

1 is a first message flow diagram illustrating a process for preventing content duplication transmission according to an embodiment of the present invention.
FIG. 2 is a view showing information of a PCT according to an embodiment of the present invention.
3 is a first message flow diagram illustrating an operation of a PCT apparatus for preventing content duplication transmission according to an embodiment of the present invention.
4 is a message flow diagram illustrating a process of adding resource information and a base station ID to a base station in a streaming request according to an embodiment of the present invention.
5 is a flowchart illustrating a process of adding resource information and a base station ID to a base station in a streaming request according to an embodiment of the present invention.
6 is a message flow diagram illustrating a process of acquiring resource information and a BS ID of a terminal according to an exemplary embodiment of the present invention.
7 is a flowchart illustrating a process of acquiring resource information and a BS ID of a terminal according to an exemplary embodiment of the present invention.
8 is a second message flow diagram illustrating a process for preventing content duplication transmission according to an embodiment of the present invention.
9 is a diagram illustrating a multicast message format according to an embodiment of the present invention.
10 is a second flowchart illustrating an operation of a PCT apparatus for preventing content duplication transmission according to an embodiment of the present invention.
11 is a flowchart illustrating an operation procedure of a BM-SC for preventing content duplication transmission according to an embodiment of the present invention.
12 is a flowchart illustrating an operation of an MBMS GW for preventing content duplication according to an embodiment of the present invention.
13 is a block diagram of a PCT apparatus according to an embodiment of the present invention.
14 is a block diagram of a BM-SC according to an embodiment of the present invention.
15 is a block diagram of a base station according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

In the following description, the terminal includes a mobile communication terminal supporting wireless communication, a smart phone, a tablet PC, a digital camera, MP3, navigation, a laptop, and a netbook.

1 is a first message flow diagram illustrating a process for preventing content duplication transmission according to an embodiment of the present invention.

1, a mobile network according to an exemplary embodiment of the present invention includes a user equipment 100, a PCT device 104, and a content service provider (Over the Top) .

The PCT apparatus 104 receives a request transmitted from the terminal 100 to the content providing server 106 for live streaming (step 110). The request for live streaming may be an HTTP request. The request for live streaming transmitted by the terminal 100 may include information on contents for live streaming. The information on the content may be an ID of a content requested by the terminal 100, and the content ID may be a URL (Uniform Resource Location) for the content.

Thereafter, the PCT device 104 determines whether the content included in the live streaming request of the terminal 100 exists in the PCT (step 112).

The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as shown in FIG.

The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, an International Mobile Subscriber Identity (IMSI), a Globally Unique Temporary Identifier (GUIT), or the like.

The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, a base station IP address, and the like.

The content ID indicates an ID of a content requested by a terminal that has transmitted a live streaming request, and may be an URL where the content is located.

The network resource represents network resource information to which a terminal that has transmitted a live streaming request belongs, for example, a CQI (Channel Quality Information), an MCS (Modulation and Coding Scheme), and the like.

The time stamp indicates the time when the content requested by the terminal that transmitted the live streaming request is first requested. Here, the network resource and the base station ID can be obtained as shown in FIGS. 4 and 6, and will be described below.

If the content included in the live streaming request of the terminal 100 is not present in the PCT, the PCT device 104 adds the content ID to the PCT since the content is not requested step). For example, the PCT device 104 may determine the content of the content by comparing the terminal ID of the terminal requesting the content, the base station ID of the terminal requesting the content, the content ID of the content, Lt; RTI ID = 0.0 > PCT. ≪ / RTI >

Thereafter, the PCT device 104 transmits the received live streaming request to the content providing server 106 (step 116).

Thereafter, the PCT apparatus 104 receives a request transmitted from the terminal 102 to the content providing server 106 for live streaming (step 118). The request for live streaming may be an HTTP request. The request for live streaming transmitted by the terminal 102 may include information about the content for live streaming. The information on the content may be an ID of a content requested by the terminal 102, and the content ID may be a URL to the content.

The PCT device 104 determines whether the content included in the live streaming request of the terminal 102 exists in the PCT (step 120). The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as described above.

If the content included in the live streaming request of the terminal 102 exists in the PCT, the content is already requested and is the content requested by the content providing server 106, The MS 102 adds information on the terminal ID, the BS ID, and the network resources of the MS 102 to the PCT (step 122). The PCT apparatus sets a content ID and a time stamp in the PCT as a content ID of a requested content and a time stamp.

Thereafter, when the PCT device 104 receives a response to the live streaming request from the content providing server 106 (operation 124). For example, when the requested content is received, the terminal determines the terminal ID having the same content ID as the content ID of the content requested by the PCT, and transmits the content to the terminals 100 and 102 having the determined terminal ID through GTP tunneling (Steps 126 and 128). As shown in FIG. 1, if there are a plurality of corresponding terminals, the content is copied by the number of the corresponding terminals and transmitted.

3 is a first message flow diagram illustrating an operation of a PCT apparatus for preventing content duplication transmission according to an embodiment of the present invention.

Referring to FIG. 3, the PCT receives a request transmitted from the first terminal to the content providing server for live streaming (step 305). The request for live streaming may be an HTTP request. The request for live streaming transmitted by the first terminal may include information on contents for live streaming. The information on the content may be an ID of content requested by the first terminal, and the content ID may be a URL to the content.

Thereafter, the PCT determines whether content included in the live streaming request of the first terminal exists in the PCT (step 310).

The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as shown in FIG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, IMSI, GUIT, or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, a base station IP address, and the like. The content ID indicates an ID of a content requested by a terminal that has transmitted a live streaming request, and may be an URL where the content is located. The network resource represents resource information of a network to which a terminal that has transmitted a live streaming request belongs, and examples thereof include CQI, MCS, and the like. The time stamp indicates the time when the content requested by the terminal that transmitted the live streaming request is first requested. Here, the network resource and the base station ID can be obtained as shown in FIGS. 4 and 6, and will be described below.

If the content included in the live streaming request of the first terminal is not present in the PCT, the PCT device adds the content ID to the PCT since the content has not been requested. For example, the PCT device may include a terminal ID of the terminal requesting the content, a base station ID of the terminal requesting the content, a content ID of the content, a network resource of a network to which the terminal requesting the content belongs, A stamp is added to the PCT.

Thereafter, the PCT device transmits the received live streaming request to the content providing server (step 325).

Thereafter, the PCT apparatus receives a request transmitted from the second terminal to the content providing server for live streaming (operation 330). The request for live streaming may be an HTTP request. The request for live streaming transmitted by the second terminal may include information on the content for live streaming. The information on the content may be an ID of a content requested by the second terminal, and the content ID may be a URL to the content.

Thereafter, the PCT determines whether content included in the live streaming request of the terminal exists in the PCT (step 335). The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as described above.

If the content included in the live streaming request of the second terminal exists in the PCT, the content is already requested content, and the content is requested by the content providing server. Therefore, And information on the terminal ID, base station ID, and network resources for the second terminal is added to the PCT in operation 340. The PCT apparatus sets a content ID and a time stamp in the PCT as a content ID of a requested content and a time stamp.

Thereafter, the PCT device receives a response to the live streaming request from the content providing server. For example, when receiving the requested content, the terminal determines the terminal ID having the same content ID as the content ID of the content requested by the PCT, and transmits the content to the terminal (first terminal, second terminal) GTP tunneling (step 345). If there are a plurality of terminals, the PCT apparatus copies and transmits the contents to the number of the corresponding terminals.

4 is a message flow diagram illustrating a process of adding resource information and a base station ID to a base station in a streaming request according to an embodiment of the present invention.

Referring to FIG. 4, the base station (eNB) 404 receives a request transmitted from the UE 402 to the content providing server for live streaming (step 410).

Then, the BS 404 includes the ID and the network information of the BS 404 in the live streaming request (step 415). The network information indicates information on network resources to which the terminal 402 that transmitted the live streaming request belongs, and may be an example of the CQI, MCS, and the like.

The BS 404 may include the ID and network information of the BS 404 in the GTP U extension header, the IP option header, the TCP option header, and the Http option header.

In step 420, the BS 404 transmits a live streaming request including the ID of the BS 404 and the network information to the content providing server. In this process, the PCT device 406 receives a live streaming request transmitted by the robbing base station 404

5 is a flowchart illustrating a process of adding resource information and a base station ID to a base station in a streaming request according to an embodiment of the present invention.

Referring to FIG. 5, the base station receives a request transmitted from the terminal to the content providing server for live streaming (step 505).

Then, the base station includes the ID and network information of the base station in the live streaming request. The network information indicates information on a network resource to which a terminal that has transmitted a live streaming request belongs, for example, CQI, MCS, and the like. The base station may include the ID and network information of the base station 404 in a GTP U extension header, an IP option header, a TCP option header, and an HTP option header.

Then, the BS transmits a live streaming request including the ID and the network information of the BS to the content providing server (step 510). In this process, the PCT apparatus receives a live streaming request transmitted from the base station.

6 is a message flow diagram illustrating a process of acquiring resource information and a BS ID of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the PCT apparatus 606 receives a request transmitted from the terminal 602 to the content providing server for live streaming (step 610).

The PCT apparatus 606 transmits an Evolved Packet Core (EPC) entity 604 to the EPC 602 to acquire the BS ID of the BS 603 to which the MS 602 belongs. And requests the base station ID (step 615). The request message includes a terminal ID, so that the EPC entity 604 can identify the corresponding terminal.

Thereafter, the PCT apparatus 606 acquires the base station ID of the base station 603 to which the terminal 602 belongs from the EPC entity 604 (operation 620). The EPC entity may be an MME (Mobility Management Entity) or the like.

Thereafter, the PCT apparatus 606 requests network information from the BS 603 to which the MS 602 belongs (step 625). The network information represents the above-mentioned network resources. Thereafter, the PCT apparatus 606 acquires network information from the base station 603 to which the terminal 602 belongs (step 630).

7 is a flowchart illustrating a process of acquiring resource information and a BS ID of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the PCT receives a request transmitted to a content providing server for live streaming in step 705.

In step 710, the PCT apparatus requests the base station ID of the base station to which the terminal belongs in the EPC entity to obtain the base station ID of the base station to which the terminal belongs. The request message includes the terminal ID, so that the EPC entity can distinguish the terminal.

Thereafter, the PCT device acquires the base station ID of the base station to which the terminal belongs from the EPC entity (step 711). The EPC entity may be an MME (Mobility Management Entity) or the like.

Thereafter, the PCT requests network information to the base station to which the terminal belongs (step 712). The network information represents the above-mentioned network resources. Then, the PCT device acquires network information from the base station to which the terminal belongs (Step 715).

8 is a second message flow diagram illustrating a process for preventing content duplication transmission according to an embodiment of the present invention.

8, the PCT apparatus 806 adopts a multicast transmission scheme in addition to the existing unicast transmission scheme, and selects a higher efficiency scheme among the unicast transmission scheme and the multicast transmission scheme .

Referring to FIG. 8, a mobile network according to an embodiment of the present invention includes a user equipment (UE) 801, an EPC 803, an MBMS GW 804, and a BM-SC 805. A PCT device 806, and a content providing server (Live Streaming Server) 807.

The PCT apparatus 806 receives a request transmitted from the terminal 801 to the content providing server 807 for live streaming (step 810). The request for live streaming may be an HTTP request. The request for live streaming transmitted by the terminal 801 may include information about the content for live streaming. The information on the content may be an ID of a content requested by the terminal 801, and the content ID may be a URL to the content.

Thereafter, the PCT apparatus 806 determines whether content included in the live streaming request of the terminal 101 exists in the PCT (step 812).

The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as shown in FIG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, IMSI, GUIT, or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, a base station IP address, and the like. The content ID indicates an ID of a content requested by a terminal that has transmitted a live streaming request, and may be an URL where the content is located. The network resource represents network resource information to which a terminal that has transmitted a live streaming request belongs, for example, CQI, MCS, and the like. The time stamp indicates the time when the content requested by the terminal that transmitted the live streaming request is first requested. Here, the network resource and the base station ID can be obtained as shown in FIGS. 4 and 6. FIG.

If the content included in the live streaming request of the terminal 801 is not present in the PCT, the PCT device 806 adds the content ID to the PCT since the content is a content that has never been requested. For example, the PCT device 806 may transmit the content ID, the terminal ID of the terminal requesting the content, the base station ID of the terminal requesting the content, the content ID of the content, the network information of the network, Lt; RTI ID = 0.0 > PCT. ≪ / RTI >

Thereafter, the PCT apparatus 806 transmits the received live streaming request to the content providing server 807 (step 814).

Thereafter, the PCT apparatus 806 receives a request transmitted from the terminal 802 to the content providing server 807 for live streaming (step 815).

The request for live streaming may be an HTTP request. The request for live streaming transmitted by the terminal 802 may include information about the content for live streaming. The information on the content may be an ID of a content requested by the terminal 802, and the content ID may be a URL to the content.

The PCT device 806 determines whether content included in the live streaming request of the terminal 802 exists in the PCT (step 816). The PCT includes a UE ID, an eNB ID, a content ID, a network resource, and a time stamp (TimeStamp) as described above.

If the content included in the live streaming request of the terminal 802 exists in the PCT, the content is already requested, and since the content is requested by the content providing server 807, 806 adds information on the terminal ID, base station ID, and network resources of the terminal 802 to the PCT without requesting duplication. The PCT apparatus sets a content ID and a time stamp in the PCT as a content ID of a requested content and a time stamp.

Thereafter, in step 818, the PCT device 806 receives a response to the live streaming request from the content providing server 807. For example, when receiving the requested content, it is determined whether to transmit the received content by unicast or multicast (step 820). The PCT device 806 may determine to use the multicast scheme if the following equation is satisfied.

&Quot; (1) "

는 단말 i의 Spectral Efficiency이고, 이는 PCT로부터 알 수 있다.

는 MBMS의 Spectral Efficiency이고 미리 정의된다.

는 해당 비디오를 요청한 같은 eNB의 모든 단말로서 PCT 로부터 알 수 있다

는 여유를 위한 임의의 상수로서 미리 정의된다.Here, R is the bit rate of the requested video, which is known from the corresponding content.

Is the spectral efficiency of terminal i, which is known from the PCT.

Is the Spectral Efficiency of MBMS and is defined in advance.

Can be known from the PCT as all terminals of the same eNB requesting the video

Is predefined as an arbitrary constant for the margin.

The above equation indicates that all the terminals in the base station determine whether the unicast method or the multicast method is more efficient considering the spectral efficiency.

If the PCT device 806 determines that the multicast scheme is more efficient, the PCT device 806 requests the BM-SC 805 (indicating an MBMS system) to multicast live streaming 822 step). In this case, the message format used is as shown in FIG. The message includes a base station ID, a terminal ID, a video bit rate, and MBMS_SIGNAL_FLAG. Here, the terminal ID indicates an ID of all terminals that have transmitted a live streaming request, and may be an IP address, an IMSI, a GUIT, or the like.

The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, a base station IP address, and the like.

The video bit rate represents the bit rate of the content for live streaming, and MBMS_SIGNAL_FLAG is the flag value representing MBMS.

Thereafter, the BM-SC 805 transmits a response to the request to the PCT device 806 (step 824). The response indicates an affirmative or negative response to the request.

When determining that the multicast transmission is to be performed, the BM-SC 805 transmits an MBMS service announcement message to the UEs 801 and 802 to determine whether the content requested by the UE is an MBMB channel (Step 826).

In step 828, the UEs 801 and 802 transmit an MBMS joining message for subscribing to the multicast service to the BM-SC 805 in order to receive the contents through the multicast service.

In step 830, the BM-SC 805 transmits a session start request message to the MBMS GW 804 to start the multicast service. For example, in the case of the 3G mobile communication system, the GGSN can perform the role of the MBMS GW.

In step 832, the MBMS GW 804 transmits a session start request message to the EPC (MME) 804 to allocate a multicast bearer or a radio resource to be used in the multicast service. The EPC (MME) 804 transmits a session start request message to the base station 803 in order to allocate a radio resource and notify it.

Then, the EPC (MME) 804 receives a session start response message from the BS 803, transmits the session start response to the MBMS GW 804, and the MBMS GW 804 transmits the session start response response to the BM-SC 805 to inform that the radio resource and the multicast bearer are allocated (step 834)

Then, the BM-SC 805 transmits an MBMS notification message to the UEs 801 and 802 to notify that the multicast service is started. In step 836, the BM-SC 805 transmits the MBMS notification message to the PCT 806 to inform the start of the multicast service.

Thereafter, the PCT device 806 transmits the received content for live streaming to the MBMS GW 804 (step 838).

Thereafter, the MBMS GW 804 transmits the received content for live streaming to the base station 803 through a multicast bearer (step 840).

The base station 803 transmits the received content for live streaming to the terminals 801 and 802 through a multicast channel (step 842).

10 is a second flowchart illustrating an operation of a PCT apparatus for preventing content duplication transmission according to an embodiment of the present invention.

Referring to FIG. 10, when the PCT receives a response to a live streaming request from a content providing server (operation 1010). For example, when receiving the requested content, it is determined whether to transmit the received content by unicast or multicast (step 1015). The above-described process is performed using Equation (1).

 If the PCT apparatus determines that the unicast method is more efficient (Step 1020), the PCT apparatus transmits the received streaming contents to the corresponding terminal (Step 1025).

If the PCT device determines that the multicast method is more efficient (step 1020), it requests the BM-SC 805 to multicast live streaming (step 1030). In this case, the message format used is as shown in FIG. The message includes a base station ID, a terminal ID, a video bit rate, and MBMS_SIGNAL_FLAG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, IMSI, GUIT, or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, and the like. The video bit rate represents the bit rate of the content for live streaming, and MBMS_SIGNAL_FLAG is the flag value representing MBMS.

Thereafter, the PCT apparatus 806 receives a response to the request from the BM-SC 805 (step 1035). The response indicates an affirmative or negative response to the request.

If the received response is an affirmative response, the PCT receives an MBMS notification message informing that the multicast service is started from the BM-SC in step 1040.

Thereafter, the PCT device 806 transmits the content for live streaming received from the content providing server to the MBMS GW (step 1045).

11 is a flowchart illustrating an operation procedure of a BM-SC for preventing content duplication transmission according to an embodiment of the present invention.

Referring to FIG. 11, the BM-SC receives a multicast request for live streaming from the PCT device (step 1110). In this case, the message format used is as shown in FIG. The message includes a base station ID, a terminal ID, a video bit rate, and MBMS_SIGNAL_FLAG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, an International Mobile Subscriber Identity (IMSI), a Globally Unique Temporary Identifier (GUIT), or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, and the like. The video bit rate represents the bit rate of the content for live streaming, and MBMS_SIGNAL_FLAG is the flag value representing MBMS.

Then, the BM-SC transmits a response to the request to the PCT device (step 1115). The response indicates an affirmative or negative response to the request. When determining that the multicast transmission is determined, the BM-SC transmits an MBMS service announcement message to the terminal that has transmitted the live streaming request, and the content requested by the terminal is delivered through the MBMB channel (Step 1120).

In step 1130, the BM-SC receives an MBMS joining message for subscribing to the multicast service from the terminal that has transmitted the live streaming request, in order to receive the content through the multicast service.

In step 1135, the BM-SC transmits a session start request message to the MBMS GW 804 to start the multicast service. For example, in the case of the 3G mobile communication system, the GGSN can perform the role of the MBMS GW.

In step 1140, the BM-SC receives a session start response from the MBMS GW 804 indicating that a radio resource and a multicast bearer have been allocated.

Then, the BM-SC transmits an MBMS notification message to a terminal that has transmitted a live streaming request to inform that the multicast service is started. In step 1145, the BM-SC transmits the MBMS notification message to the PCT to notify that the multicast service is started.

12 is a flowchart illustrating an operation of an MBMS GW for preventing content duplication according to an embodiment of the present invention.

Referring to FIG. 12, the MBMS GW receives a session start request message for starting a multimedia service from the BM-SC in step 1210. For example, in the case of the 3G mobile communication system, the GGSN can perform the role of the MBMS GW.

In step 1215, the MBMS GW transmits a session start request message to an EPC (MME) to allocate a multicast bearer or a radio resource to be used for the multicast service.

In step 1230, the MBMS GW receives a session start response message from the EPC in step 1220, and transmits the session start response to the BM-SC in step 1230 to indicate that the radio resource and the multicast bearer are allocated.

after. The MBMS GW receives content for live streaming from the PCT device (step 1235). And transmits the received content for live streaming to the base station through the multicast bearer in step 1240. The base station indicates a base station to which the terminal that transmitted the live streaming request belongs.

13 is a block diagram of a PCT apparatus according to an embodiment of the present invention.

Referring to FIG. 13, the PCT apparatus includes a control unit 1310, a transceiver unit 1320, and a storage unit 1330.

The control unit 1310 controls and processes the overall operation of the PCT apparatus and particularly includes the redundancy management unit 1311 and the efficiency management unit 1313 so that a redundant request and a redundant request are transmitted when a plurality of terminals request the same streaming content. Thereby preventing duplicated streaming content from being provided.

The transceiver 1320 provides an interface for transmitting and receiving information to and from other entities through a network under the control of the controller 1310. [ The transmission / reception unit 1320 may be referred to as a network card, and may use an Ethernet interface, an optical interface, an Asynchronous Transfer Mode (ATM) interface, and the like. The transceiver unit 1320 transmits and receives signals as described above. Accordingly, the transmission / reception unit 1320 may be referred to as a transmission unit, a reception unit, or a transmission / reception unit.

The storage unit 1330 stores basic programs, setting information, and the like necessary for the operation of the controller 1310. In particular, the storage unit 1330 stores the PCT.

The duplication management unit 1311 checks duplication of contents for live streaming requested by a plurality of terminals. If the content included in the live streaming request of the terminal is present in the PCT, the content is the content already requested and the content requested by the content providing server. Therefore, the duplication management unit 1311 cancels the duplication request , Information on the terminal ID, base station ID, and network resources for the terminal is added to the PCT. The duplication management unit 1311 sets a content ID and a time stamp in the PCT as a content ID and a time stamp of the requested content.

Upon receiving a request for live streaming transmitted from the mobile station, the redundancy managing unit 1311 may request the base station ID and network information for the mobile station through EPC.

The efficiency management unit 1313 receives a response to the live streaming request from the content providing server. For example, when receiving the requested content, it is determined whether to transmit the received content by unicast method or multicast method. If the above Equation (1) is satisfied, the efficiency management unit 1313 determines to use the multicast scheme.

If it is determined that the unicast method is more efficient, the duplication management unit 1311 transmits the received streaming content to the corresponding terminal.

If the multicast scheme is determined to be more efficient, the duplication management unit 1311 requests the BM-SC to multicast live streaming. In this case, the message format used is as shown in FIG. The message includes a base station ID, a terminal ID, a video bit rate, and MBMS_SIGNAL_FLAG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, IMSI, GUIT, or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, and the like. The video bit rate represents the bit rate of the content for live streaming, and MBMS_SIGNAL_FLAG is the flag value representing MBMS.

When receiving a response to the request from the BM-SC, the response indicates an affirmative or negative response to the request, and if the received response is an affirmative response, the BM-SC And receives an MBMS notification message informing that the multicast service is started from the MBMS notification unit 805.

The duplication management unit 1311 transmits the content for live streaming received from the content providing server to the MBMS GW.

14 is a block diagram of a BM-SC according to an embodiment of the present invention.

Referring to FIG. 14, the BM-SC includes a control unit 1410 and a transmission / reception unit 1420.

The control unit 1410 controls and processes the overall operation of the BM-SC. In particular, the control unit 1410 includes the multicast management unit 1412, thereby enabling the PCT device to utilize the multicast method when transmitting redundant streaming contents.

The transceiver 1420 provides an interface for transmitting and receiving information to and from other entities through the network under the control of the controller 1410. The transceiver 1420 may be referred to as a network card, and may use an Ethernet interface, an optical interface, an Asynchronous Transfer Mode (ATM) interface, and the like. The transceiver 1420 transmits and receives signals as described above. Accordingly, the transmission / reception unit 1420 may be referred to as a transmission unit, a reception unit, or a transmission / reception unit.

The multicast management unit 1412 receives a multicast request for live streaming from the PCT apparatus. In this case, the message format used is shown in FIG. The message includes a base station ID, a terminal ID, a video bit rate, and MBMS_SIGNAL_FLAG. The terminal ID indicates an ID of a terminal that has transmitted a live streaming request, and may be an IP address, IMSI, GUIT, or the like. The base station ID indicates an ID of a base station to which a terminal that has transmitted a live streaming request belongs, and may be an eNB TEID, a cell ID, and the like. The video bit rate represents the bit rate of the content for live streaming, and MBMS_SIGNAL_FLAG is the flag value representing MBMS.

The multicast management unit 1412 transmits a response to the request to the PCT apparatus. The response indicates an affirmative or negative response to the request. When determining that the multicast transmission is to be performed, the multicast management unit 1412 transmits an MBMS service announcement message to the terminal that has transmitted the live streaming request, .

In order to receive the contents through the multicast service, the multicast management unit 1412 receives an MBMS joining message for subscribing to the multicast service from the terminal that has transmitted the live streaming request.

In order to start the multicast service, the multicast management unit 1412 transmits a session start request message to the MBMS GW in the MBMS GW. For example, in the case of the 3G mobile communication system, the GGSN can perform the MBMS GW have.

The multicast management unit 1412 receives a session start response indicating that a radio resource and a multicast bearer are allocated.

The multicast management unit 1412 transmits an MBMS notification message to a terminal that has transmitted a live streaming request to inform that the multicast service is started. The multicast management unit 1412 also transmits the MBMS notification message to the PCT to notify that the multicast service is started.

15 is a block diagram of a base station according to an embodiment of the present invention.

Referring to FIG. 15, the base station includes a control unit 1510 and a transmission / reception unit 1520.

The control unit 1510 controls and processes the overall operation of the base station. In particular, when the terminal transmits a request for live streaming by including the information management unit 1512, the control unit 1510 includes the base station ID and the network information in the request do.

The transmission / reception unit 1520 provides an interface for transmitting / receiving information to / from other entities through the network under the control of the control unit 1510. The transmission / reception unit 1520 transmits / receives a signal or a message under the control of the controller 1510.

The transceiver 1520 performs a function of transmitting and receiving a signal through a wireless channel such as band conversion and amplification of a signal. That is, the transceiver unit 1520 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and down converts the RF band signal received through the antenna to a baseband signal. For example, the transceiver unit 1520 may include an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and an analog to digital converter (ADC).

When the terminal receives the request transmitted to the content providing server for live streaming, the information managing unit 1512 includes the ID and the network information of the base station in the live streaming request. The network information indicates information on a network resource to which a terminal that has transmitted a live streaming request belongs, for example, CQI, MCS, and the like. The base station may include the ID and network information of the base station 404 in a GTP U extension header, an IP option header, and a TCP option header.

The information management unit 1512 transmits a live streaming request including the ID and network information of the base station to the content providing server. In this process, the PCT apparatus receives a live streaming request transmitted from the base station.

Embodiments of the invention and all functional operations described herein may be implemented in computer software, firmware, or hardware, including the structures disclosed herein and their equivalent structures, or in one or more combinations thereof . The embodiments disclosed herein may also be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer readable medium for execution by, or for controlling the operation of, a data processing apparatus .

The computer-readable medium may be a machine-readable storage medium, a machine-readable storage substrate, a memory device, a configuration of matter affecting the machine-readable propagation stream, or a combination of one or more of the foregoing. The term data processing apparatus includes, by way of example, a programmable processor, a computer, or any apparatus, apparatus, and machine for processing data, including multiple processors or computers. The device may include code that, in addition to the hardware, creates code to create an execution environment for the computer program, such as processor firmware, a protocol stack, a database management system, an operating system, or code that constitutes one or more combinations thereof.

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. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (20)

A method of a PCT (Pending Contents Table) apparatus for preventing duplicated transmission of streaming content,
Determining whether a content corresponding to the streaming request is requested to a content providing server when the streaming request is received from the terminal;
A step of holding the transmission of the streaming request to the content providing server when the content providing server requests the content;
Transmitting the streaming request to the content providing server when the content providing server does not request the content;
Determining a transmission mode of the content to the terminal requesting the content when the content is received from the content providing server;
And transmitting the content to a terminal requesting the content according to the determined transmission method.
The method according to claim 1,
Wherein the step of holding the transmission of the streaming request to the content providing server comprises:
Wherein the item corresponding to the streaming request includes at least one of a terminal ID of a terminal requesting the streaming, a base station ID of a base station to which the terminal belongs, a content ID of the content, A network resource of the base station, and a time stamp indicating a time at which the content is first requested.
The method according to claim 1,
Wherein the step of transmitting the streaming request to the content providing server comprises:
Wherein the item corresponding to the streaming request includes at least one of a terminal ID of a terminal requesting the streaming, a base station ID of a base station to which the terminal belongs, a content ID of the content, A network resource of the base station, and a time stamp indicating a time at which the content is first requested.
The method according to claim 1,
Wherein the step of determining the transmission mode of the content to the terminal requesting the content comprises:
Determining whether to transmit the content in a multicast manner or in a unicast manner.
5. The method of claim 4,
The method of claim 1, wherein the determining step comprises determining whether to transmit the content in a multicast manner or in a unicast manner,
If the following equation is satisfied, determining to transmit the content in a multicast manner.
&Quot; (2) "

Here, R is the bit rate of the requested video, which is known from the corresponding content.

Is the spectral efficiency of terminal i, which is known from the PCT.

Is the spectral efficiency of MBMS and is defined in advance.

Can be known from the PCT as all terminals of the same eNB requesting the video

Is predefined as an arbitrary constant for the margin.
5. The method of claim 4,
Further comprising the step of transmitting a message to the multicast server when it is determined to transmit the content in a multicast manner,
Wherein the message includes at least one of a terminal ID of a terminal requesting the streaming, a base station ID of a base station to which the terminal belongs, a bit rate of the content, and a flag indicating a multicast signal.
The method according to claim 1,
If the streaming request does not include the base station ID of the base station to which the terminal requesting the streaming belongs and the network resource of the base station,
Further comprising the step of requesting and acquiring a base station ID of a base station to which the terminal requesting the streaming belongs or a network resource of the base station.
The method according to claim 1,
When the content providing server requests the content,
Wherein the content ID of the content does not exist in an item corresponding to the streaming request of the PCT.
A method of a base station apparatus for preventing duplicated transmission of streaming contents,
Receiving a streaming request from a terminal;
Including a base station ID of a base station to which the terminal requesting the streaming belongs and network information of the base station in the streaming request;
And transmitting the streaming request including the base station ID of the base station to which the terminal requesting the streaming belongs and the network resource of the base station to the network device.
10. The method of claim 9,
Wherein the network resource is at least one of a Channel Quality Information (CQI) and a Modulation and Coding Scheme (MCS) for a terminal that has transmitted the streaming request.
A PCT (Pending Contents Table) apparatus for preventing duplicated transmission of streaming contents,
A transmission / reception unit for transmitting / receiving a signal,
When receiving a streaming request from the terminal, determines whether the content corresponding to the streaming request has been requested to the content providing server. If the content providing server requests the content, the streaming request transmission to the content providing server is suspended A duplication management unit for sending the streaming request to the content providing server when the content providing server does not request the content,
And an efficiency manager for determining a transmission mode of the content to the terminal requesting the content when the content is received from the content providing server,
And the duplication management unit transmits the content to the terminal that requested the content according to the determined transmission scheme.
12. The method of claim 11,
The duplication management unit,
When the transmission of the streaming request to the content providing server is suspended,
Wherein the item corresponding to the streaming request includes an item ID corresponding to the terminal ID of the terminal requesting the streaming, a base station ID of the base station to which the terminal belongs, a content ID of the content, And a time stamp indicating the time at which the content was first requested.
12. The method of claim 11,
The duplication management unit,
When transmitting the streaming request to the content providing server,
Wherein the item corresponding to the streaming request includes an item ID corresponding to the terminal ID of the terminal requesting the streaming, a base station ID of the base station to which the terminal belongs, a content ID of the content, And a time stamp indicating the time at which the content was first requested.
12. The method of claim 11,
The efficiency management unit,
When determining the transmission mode of the content to the terminal requesting the content,
The apparatus for determining whether to transmit the content in a multicast manner or in a unicast manner.
15. The method of claim 14,
The efficiency management unit,
When determining whether to transmit the content in a multicast manner or in a unicast manner,
If the following equation is satisfied, decides to transmit the content in a multicast manner.
&Quot; (3) "

Here, R is the bit rate of the requested video, which is known from the corresponding content.

Is the spectral efficiency of terminal i, which is known from the PCT.

Is the spectral efficiency of MBMS and is defined in advance.

Can be known from the PCT as all terminals of the same eNB requesting the video

Is predefined as an arbitrary constant for the margin.
15. The method of claim 14,
The duplication management unit,
When it is determined to transmit the content in a multicast manner, transmitting the message to the multicast server,
Wherein the message includes at least one of a terminal ID of a terminal requesting the streaming, a base station ID of a base station to which the terminal belongs, a bit rate of the content, and a flag indicating a multicast signal.
12. The method of claim 11,
The duplication management unit
If the streaming request does not include the base station ID of the base station to which the terminal requesting the streaming belongs and the network resource of the base station,
And requests the base station ID of the base station to which the terminal requesting the streaming belongs or the network resource of the base station to the network device.
12. The method of claim 11,
When the content providing server requests the content,
And the content ID of the content does not exist in an item corresponding to the streaming request of the PCT.
A base station apparatus for preventing duplicated transmission of streaming contents,
A transmission / reception unit for transmitting / receiving a signal,
A base station ID of a base station to which the terminal requesting the streaming is included in the streaming request, network information of the base station, a base station ID of a base station to which the terminal requesting the streaming belongs, And transmitting the streaming request to the network device.
20. The method of claim 19,
Wherein the network resource is at least one of a CQI and an MCS for a terminal that has transmitted the streaming request.

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