KR20090110118A - Apparatus and Method for transmitting/receiving Massive Contents in Broadcast Multicast Service system - Google Patents

Abstract

PURPOSE: An apparatus and a method for transmitting/receiving massive contents in a broadcast multicast service system are provided to increase transmission efficiency about massive contents in the broadcast multicast service system. CONSTITUTION: The massive contents are divided into several contents. The same program identifier is assigned to each of the divided massive contents. A different flow identifier is assigned to each divided massive contents(172). The divided massive contents are transmitted to a terminal at a different time zone(174).

Description

Apparatus and Method for transmitting / receiving Massive Contents in Broadcast Multicast Service system}

The present invention relates to a BCMCS (Broadcast Multicast Service) service system, and more particularly, to an apparatus and method for separating and transmitting a large amount of content into a plurality of flows in a BCMCS service system.

BCMCS (Broadcast Multicast Service) is a standardization work in 3GPP2, and provides a single link to multiple users for the purpose of transmitting multimedia data. It can eliminate unnecessary repetitive transmission of the same information in a wireless network. There is this.

The BCMCS service having such an advantage usually transmits broadcast contents to multiple subscribers simultaneously using a 1x EV-DO system. In particular, the BCMCS service uses the same frequency allocation (FA) as the service provided in the aforementioned 1x EV-DO system, so that a large amount of content is serviced at night time to minimize the impact on the existing unicast service. Is common.

As such, in order to provide a large amount of content in a late night time zone, one content must be transmitted in one flow. However, when the subscriber station is turned off during a specific time period or when the subscriber station is located in an area other than service coverage, such as when the flow is not normally received, the part of the flow that is not received properly In all cases, a problem arises in that retransmission is required to the unicast service. As a result, the BCMCS system needs to check and retransmit parts of the terminal that have not been received for the corresponding content, and even if this is checked, the BCMCS system increases the load of the BCMCS system when the number of subscribers to be retransmitted increases. Therefore, there is a problem that adversely affects the existing unicast service provided by 1x EV-DO. Therefore, there is a need for a method for increasing the transmission efficiency for a large amount of content and minimizing the retransmission attempt by the unicast method in the BCMCS service.

The present invention was devised to meet the above demands, and an object of the present invention is to provide a method and apparatus for increasing a transmission efficiency for a large content in a BCMCS service system.

Another object of the present invention is to provide a method and apparatus for minimizing retransmission attempt by unicast scheme in a BCMCS service system.

For the above purpose, the mass content transmission method in the BCMCS (Broadcast Multicast service) service system of one embodiment of the present invention includes (a) dividing the large amount content into a plurality of pieces, and the same program identifier for each of the divided large amount contents. Allocating different flow identifiers to each of the divided mass content; And (b) transmitting each of the divided large-capacity contents to the terminal in different time zones.

According to another aspect of the present invention, there is provided a method of receiving a large content in a broadcast multicast service (BCMCS) service system, including: (a) distinguishing and storing broadcast contents having the same program identifier among a plurality of received broadcast contents; (b) determining a broadcast order of the broadcast content using a flow identifier for the distinguished broadcast content; and (c) integrating all of the distinguished broadcast contents according to the determined broadcast order when decoding of the differentiated broadcast contents is completed.

On the other hand, in a BCMCS (Broadcast Multicast service) service system of one embodiment of the present invention, a large-capacity content transmission device divides the large-capacity content into a plurality of pieces, allocates the same program identifier to each of the divided large-capacity contents, and divides the division. An identifier allocator for allocating different flow identifiers to each of the plurality of mass content items; And a content transmitter to transmit each of the divided large-capacity contents to the terminal in different time zones.

In addition, in the Broadcast Multicast service (BCMCS) service system according to another aspect of the present invention, a mass content receiving apparatus includes: a flow recognizer configured to distinguish and store broadcast contents having the same program identifier among a plurality of received broadcast contents; A flow comparator for determining the broadcast order of the broadcast content using the flow identifier with respect to the distinguished broadcast content; And a flow integrating unit for integrating all of the distinguished broadcast contents according to the determined broadcast order when decoding of the differentiated broadcast contents is completed.

According to the present invention, when transmitting a large amount of content in the BCMCS service system, it is possible to distribute the reception failure probability that may occur in a specific time zone by transmitting it in several time zones rather than transmitting it in a specific time zone.

In addition, according to the present invention, by distributing the reception failure probability, the competitiveness of the unicast BCMCS service is reconsidered, and the load on the unicast service in the existing 1x EV-DO system is greatly reduced. It can be effected.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, in the following description, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

1 is a diagram illustrating a configuration of a BCMCS service system according to an embodiment of the present invention, and illustrates an example for a BCMCS service provided in a 1x EV-DO system.

As shown in FIG. 1, the system includes a terminal 110 that provides a BCMCS service to a subscriber, a base station transmitter 120, a base station controller 130, a GAN 140, a PDSN 150, , An authentication server 160, a BCMCS content server 170, and a BCMCS controller 180.

The terminal 110 is a wireless terminal including a mobile communication terminal, a notebook computer, a personal digital assistant (PDA), and the like, which the user can carry and communicate with, and receives and displays broadcast contents.

The base station transmitter 120 transmits the broadcast content in the form of packet data to the terminal 110 through an air network. In addition, the base station transmitter 120 includes an interface unit performing signal matching between itself and the base station controller 130, a CDMA modulation / demodulation unit performing a modulation and demodulation function of a CDMA channel, a transceiver, and a radio frequency (RF). ) And the like.

The base station controller 130 controls the operation of the base station transmitter 120. That is, data transmitted from the base station transmitter 120 is transmitted to the PDSN 150 through the GAN 140. In addition, the base station controller 130 has a radio channel allocation and release function for the terminal 110, a transmission output control function between the terminal 110 and the base station transmitter 120, soft handoff and hard handoff between cells. (Hard Handoff) Performs functions such as determining. In addition, the base station controller 130 may further include a packet control function (PCF) for transmitting packet data.

General ATM Switch Network (GAN) 140 is connected to the base station controller 130 performs a routing function of the packet data transmitted and received in the BCMCS system. That is, it serves as a switch for performing a soft handoff between the base station controller 130 to the terminal 110 connected to the traffic, and provides a packet data service in conjunction with the PCF. In this case, a path between the PDSN 150, the authentication server 160, and the data location register (not shown) is set for the packet data service.

The PDSN 150 performs a function of providing a packet data service to the terminal 110. The PDSN 150 is an evolution of an inter-working function (IWF) used to support data communication in a second generation (2G) mobile communication system.

The authentication server 160 performs subscriber authentication when the authenticated terminal 100 requests packet data service, and encrypts data using an encryption key to transmit and receive packet data through the PDSN 350. It performs functions such as managing encryption level and collecting billing data for billing.

The BCMCS controller 170 provides and manages session information of the terminal 110 to the terminal 110, the PDSN 150, and the BCMCS content server 180 to be described later. In addition, it receives the subscriber profile from the authentication server 160, grants the service authority to the terminal 110, and performs the function of authenticating the BCMCS content providers. In addition, the BCMCS controller 170 receives the BCMCS content from the BCMCS content server 180 or the BCMCS content list so that the terminal 110 who wants the BCMCS service can select the desired BCMCS content. In this case, the terminal 110 stores the scheduling information of the broadcast service subscribed to it in the process of information acquisition (IA), and receives the BCMCS flow identifier from the BCMCS controller 170 at the start of the broadcast to perform the corresponding flow. The broadcast content is viewed by identifying the BCMCS content by receiving the BCMCS program identifier.

The BCMCS content server 180 collects one or more BCMCS content contents and encrypts and stores the collected BCMCS content. In addition, the BCMCS content server 180 finally converts the encrypted BCMCS content into an IP-based multicast stream and transmits it to the PDSN 150 using a multicast transmission technique. Here, the multicast transmission scheme is a transmission scheme for simultaneously servicing a single stream to a plurality of clients, and is a data transmission scheme suitable for a broadcast service capable of reducing input / output (I / O) and network bandwidth of a server.

A method of providing a broadcast service to a terminal in the BCMCS service system configured as described above will be described.

First, the terminal 110 wanting the BCMCS service checks the BCMCS content type and schedule through the BCMCS controller 170 or the advertisement server, the SMS server, the WAP, and the web application (S210). Subsequently, the terminal 110 registers the desired content (S220). The content recording process is not necessarily required, and the process of step S220 may be performed without performing the process of step S210. Thereafter, the terminal 110 receives flow identifier information, IP address information, port information, header information, transport / application protocol information, encryption key information, etc. from the BCMCS controller 170 (S230). Subsequently, the terminal 110 periodically receives information on the current BCMCS broadcast content through an overhead message from the base station transmitter 120 (S240). Then, the terminal 110 performs a registration process for requesting transmission of a desired flow (S250). That is, the terminal 110 determines the broadcast content to be received based on the received overhead message, and then transmits a flow request for the determined broadcast content to the base station transmitter 120. Then, the terminal 110 receives the BCMCS content (S260).

In this BCMCS broadcast service process, the terminal 110 stores the scheduling information of the broadcast service subscribed to in step S230, among which the flow identifier and IP address / Save port information. That is, in the BCMCS service system, what kind of service is a BCMC service is represented by a BCMCS flow identifier. This BCMCS flow identifier (hereinafter referred to as flow ID) includes a BCMCS program identifier (hereinafter referred to as a program ID) and a BCMCS flow identifier. In this case, the program ID indicates an identifier for a specific BCMC program, and the flow identifier indicates a specific component constituting the one BCMC program. For example, an audiovisual program such as KBS news can be distinguished as a program ID, and each audio stream and video stream constituting the audiovisual program can be distinguished by a flow separator.

In the present invention, when such a BCMCS broadcast service is provided, when a large amount of content is transmitted, one content is divided into a plurality of flows for transmission. However, as described above, when the flow ID is used as it is, the terminal 110 recognizes each BCMCS flow as independent, and thus normal decoding of the large content is impossible.

To this end, the BCMCS controller 170 according to the present invention changes the flow ID as follows so that the terminal 110 recognizes the normal large-capacity content even when the large-capacity content is divided into a plurality of flows and transmitted.

That is, the program ID field and the flow separator field are used in the same manner as before, but additionally include a flow count field, a first flow field, and a last flow field. The flow count field is configured to contain count information of flows having the same program ID, the start flow field is configured to indicate the first flow among the flows having the same program ID, and the last flow field is a flow having the same program ID. Configured to indicate the later flow of the.

3 is a diagram illustrating a flow ID structure according to an embodiment of the present invention.

Referring to FIG. 3, a flow ID according to an embodiment of the present invention is expressed through 24 bits. However, this is only an example and may be configured as 16 bits or 32 bits as necessary. In other words, it should be noted that this number of bits is only a designer's option. In the example shown, the BCMCS flow identifier is a six-bit flow identifier length field, a six-bit program ID field, a seven-bit flow identifier field, and a six-bit content for transmitting at least 50 pieces of mass content. It is configured to include the flow count field, the start field of 1 bit and the last field of 1 bit. In this case, the order of flows is indicated by the number of flow IDs. In other words, the lower the number of flow IDs in the same program ID, the earlier part of the large-capacity content. The configuration of the BCMCS controller for this purpose will be described with reference to FIG.

Meanwhile, in another embodiment of the present invention, the BCMCS flow identifier uses the program ID field and the identifier ID field in the same manner as before, but additionally, a 6-bit flow sequence field for transmitting a large amount of content divided into at least 50 or more. And a 1-bit first flow field and a 1-bit last flow field may be added. Here, the flow order field contains order information about the corresponding flow, and is interpreted as being the start or the last time only when the start flow field or the last flow field is set to three. An example of the configuration for this is shown in FIG. 4.

4 is a diagram illustrating a configuration of a BCMCS controller according to an embodiment of the present invention.

As shown in FIG. 4, the BCMCS controller includes an identifier allocator 171, a flow number information allocator 172, a viewpoint field allocator 173, and a content transmitter 174.

The identifier allocator 171 divides the large-capacity content into a plurality, allocates the same program identifier to each of the divided large-capacity contents, and allocates different flow identifiers to the divided large-capacity contents, respectively. The flow count information allocating unit 172 allocates flow count information including flow identifier count information allocated to each of the divided large-capacity content. The viewpoint field assigning unit 173 allocates a start flow field indicating the start mass content to each of the divided mass content and allocates the last flow field indicating the last mass content. The content transmitter 174 transmits each of the divided large-capacity contents to the terminal in different time zones.

On the other hand, when the flow identifier is changed as in the above-described embodiment, the terminal 110 operates as follows.

First, when the program ID is used as an identifier for the content, the terminal recognizes a flow having the same program ID as the same content. In addition, in the case of flows having the same program ID in order to indicate the order for each flow, the lower the number of flow IDs, the more the front part of the content is formed. Finally, the terminal 110 decodes each flow and stores it in a separate storage means. When all the flows in which the last flow value is set to set (1) are decoded, all the flows are integrated in the application stage (sum ) To complete the application (ie, broadcast content). An example of such a terminal configuration is shown in FIG.

5 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.

As shown in FIG. 5, the terminal 110 includes an antenna 111, a transceiver 112, a transmission processor 113, a microphone 114, a reception processor 115, a speaker 116, and a CPU 117. , A display 118, and a memory 119.

The transceiver 112 receives the broadcast content signal by the base station transmitter 120 through the antenna 111. In addition, the transceiver 112 down-converts the received signal to generate an intermediate frequency (IF) signal. The IF signal is transmitted to the receiving processor 115 to filter, decode and A / D convert the baseband signal to generate a baseband signal. In addition, the reception processing unit 115 transmits the generated baseband signal to the speaker 116 (voice data) or the CPU 117 for further processing (video data).

The transmission processing unit 113 receives analog or digital voice data from the microphone 114 or receives other outgoing baseband signals (video data) from the CPU 117. The transmission processor 113 encodes, multi-transmits, or digitizes the baseband signal to generate a processed baseband signal or an IF signal. The transceiver 112 receives a baseband signal or an outgoing IF signal processed by the transmission processor 113. The transceiver 112 up-converts the baseband signal or the IF signal to a radio frequency (RF) signal transmitted through the antenna 111.

CPU 117 is a microprocessor or microcontroller. The memory 119 is coupled to the CPU 117. The memory 119 may be configured as random access memory (RAM). The CPU 117 executes a basic operating system (OS) program stored in the memory 119 to control the overall operation of the terminal 110. In addition, the CPU 117 may execute other processes and programs residing in the memory 119. The CPU 117 may move data into or out of the memory 119 according to a request of an executing process.

The CPU 117 is also coupled to the display 118. Such a display 118 utilizes, for example, a liquid crystal display device capable of displaying text and / or at least limited graphics from a website. Alternatively, other types of displays may be used. In particular, in connection with the present invention, the CPU 117 described above further includes the configuration of FIG. 5 described below in addition to the functions described above.

6 is a diagram illustrating a configuration of a CPU according to an embodiment of the present invention.

As shown in FIG. 6, the CPU 117 described above includes a flow recognizing unit 117a, a flow comparing unit 117b, and a flow integrating unit 117c in addition to the functions described above.

The flow recognition unit 117a receives the flow identifier, recognizes the program ID and the flow identifier, and stores the broadcast content received for each program ID in the memory 119. In particular, when different flow identifiers are received for the same program ID, they may be recognized as the same broadcast content, and the start flow and the last flow for the same program ID may be recognized through the start flow field and the last flow field. The flow comparison unit 117b may perform a high / low comparison of the flow IDs to sequentially arrange broadcast contents having the same program ID and different flow IDs stored in the memory 119. The flow integrator 117c integrates the broadcast content in the order of flow IDs arranged through the flow comparison unit 117b.

In this way, when transmitting a large amount of content in the BCMCS service system, rather than transmitting in a specific time zone, it is possible to distribute the reception failure probability that may occur in a specific time zone by transmitting it in several time zones. This reconsidered the competitiveness of the unicast BCMCS service, and can significantly reduce the load on the unicast service in the existing 1x EV-DO system.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The examples are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a diagram showing the configuration of a BCMCS service system according to an embodiment of the present invention.

2 is a flowchart illustrating a BCMCS service method according to an embodiment of the present invention.

3 illustrates a flow ID structure according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of a BCMCS controller according to an embodiment of the present invention.

5 is a view showing the configuration of a terminal according to an embodiment of the present invention.

6 illustrates a configuration of a CPU according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

117a: flow recognition unit

117b: flow comparator

117c: flow integration unit

Claims (13)

As a method of transmitting large content in a broadcast multicast service (BCMCS) service system, (a) dividing the large-capacity content into a plurality, assigning the same program identifier to each of the divided large-capacity contents, and assigning different flow identifiers to each of the divided large-capacity contents; And (b) transmitting each of the divided large-capacity contents to the terminal in different time zones. The method of claim 1, wherein step (a) comprises: And allocating flow number information including flow identifier number information allocated to each of the divided large-capacity contents. The method of claim 1 or 2, wherein step (a) comprises: And assigning a start flow field indicating a start mass content to each of the divided mass contents, and assigning a last flow field indicating a last mass content. The method of claim 1, wherein in step (b), Each of the divided large content includes the flow identifier, IP address information and port information. A method of receiving a large amount of content in a broadcast multicast service (BCMCS) service system, (a) distinguishing and storing broadcast contents having the same program identifier among a plurality of received broadcast contents; (b) determining a broadcast order of the broadcast content using a flow identifier for the distinguished broadcast content; and (c) integrating all of the distinguished broadcast contents according to the determined broadcast order when decoding of the differentiated broadcast contents is completed. The method of claim 5, wherein step (b) comprises: The lower the number of the flow identifier, the larger content reception method, characterized in that for determining the broadcast order in front of the distinguished broadcast content. The method of claim 5 or 6, wherein the step (c), And when decoding of the broadcast content in which the last field is set to three among the differentiated broadcast contents is completed, determining that the decoding of the differentiated broadcast content is completed. As a mass content transmission device in a broadcast multicast service (BCMCS) service system, An identifier allocator for dividing the large-capacity content into a plurality, assigning the same program identifier to each of the divided large-capacity contents, and assigning different flow identifiers to each of the divided large-capacity contents; And And a content transmitter to transmit each of the divided large-capacity contents to the terminal in different time zones. The method of claim 8, wherein the device, And a flow count information allocator for allocating flow count information including flow identifier count information allocated to each of the divided mass content. The method of claim 8 or 9, wherein the device, And a time point field allocating unit for allocating each of the divided large-capacity contents, allocating a start flow field indicating a starting large-capacity content and allocating a last flow field indicating the last large-capacity contents. A large content receiving device in a broadcast multicast service (BCMCS) service system, A flow recognition unit for distinguishing and storing broadcast contents having the same program identifier among a plurality of received broadcast contents; A flow comparator for determining the broadcast order of the broadcast content using the flow identifier with respect to the distinguished broadcast content; And And a flow integrator for integrating all of the distinguished broadcast contents according to the determined broadcast order when decoding of the differentiated broadcast contents is completed. The method of claim 11, wherein the flow comparison unit, The lower the number of the flow identifier, the mass content receiving apparatus, characterized in that for determining the broadcast order in front of the distinguished broadcast content. The method according to claim 11 or 12, wherein the flow integration unit, And when the decoding of the broadcast content in which the last field is set to three among the differentiated broadcast contents is completed, determining that the decoding of the differentiated broadcast content is completed.

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