KR101480995B1

KR101480995B1 - Apparatus and Method for transmitting/receiving Massive Contents in Broadcast Multicast Service system

Info

Publication number: KR101480995B1
Application number: KR20080035736A
Authority: KR
Inventors: 김연종; 임종태; 이재형; 이재문; 양호진
Original assignee: 에스케이플래닛 주식회사
Priority date: 2008-04-17
Filing date: 2008-04-17
Publication date: 2015-01-09
Also published as: KR20090110118A

Abstract

In the present invention, an apparatus and method for separating and transmitting large-capacity contents into a plurality of flows in a BCMCS service system are disclosed. The method according to the present invention includes the steps of: dividing a large-capacity content into a plurality of pieces, allocating the same program identifier to each of the divided large-capacity contents, and allocating different flow identifiers to each of the divided large- The present invention provides a method for transmitting a large capacity content in a BCMCS (Broadcast Multicast Service) service system including transmitting divided large-capacity contents to terminals in different time zones, It is possible to distribute the probability of reception failure, which may occur in a specific time period, thereby restricting the competitiveness of the unicast BCMCS service. Moreover, the load on the unicast service in the existing 1x EV-DO system Can be dramatically reduced.

BCMCS, Services, Large Capacity, Content, Load, 1x EV-DO, Time, Distributed

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a BCMCS service system and a method for transmitting /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a BCMCS (Broadcast Multicast Service) service system, and more particularly, to an apparatus and method for separating large capacity contents into a plurality of flows in a BCMCS service system.

BCMCS (Broadcast Multicast Service) is a standardization work in 3GPP2. It is a service that provides a link to a large number of users for the purpose of multimedia data transmission. It can eliminate unnecessary repetitive transmission of the same information on a wireless network .

The BCMCS service having this advantage usually transmits broadcast contents to a plurality of subscribers simultaneously using the 1x EV-DO system. In particular, since the BCMCS service uses the same FA (Frequency Allocation) as the service provided in the 1x EV-DO system described above, a large amount of content is served in the night time zone in order to minimize the influence on the existing unicast service. It is common.

Thus, in order to provide a large amount of contents in the night time zone, one content must be transmitted in one flow. However, when the subscriber terminal is in an environment where the subscriber terminal is off in a specific time zone, or when the subscriber terminal is located in an area other than the service coverage, or the like, the corresponding flow is not normally received, All of them have to be retransmitted to the unicast service. In this case, the BCMCS system checks and retransmits a portion of the content that the UE has not received, and if the number of subscribers to be retransmitted is increased, the load of the BCMCS system increases And the existing unicast service provided by 1x EV-DO is adversely affected. Accordingly, there is a need for a method for increasing the transmission efficiency for a large amount of content and minimizing a retransmission attempt by a unicast method in a BCMCS service.

It is an object of the present invention to provide a method and an apparatus for increasing transmission efficiency for large capacity contents in a BCMCS service system.

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

To this end, a method for transmitting a large capacity content in a broadcast multicast service (BCMCS) service system according to an aspect of the present invention includes the steps of: (a) dividing the large capacity content into a plurality of pieces of content; Allocating different flow identifiers for each of the divided large-capacity contents; And (b) transmitting each of the divided large-capacity contents to the terminal at different time zones.

According to another aspect of the present invention, there is provided a method for receiving a large capacity content in a broadcast multicast service (BCMCS) service system, the method comprising: (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 contents using the flow identifier for the distinguished broadcast contents; and (c) when the decoding of the distinguished broadcast contents is completed, merging all of the distinguished broadcast contents according to the decided broadcast order.

Meanwhile, in a BCMCS (Broadcast Multicast Service) service system according to an 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, An identifier assigning unit for assigning different flow identifiers to the respective large-capacity contents; And a content transmitter for transmitting the divided large-capacity contents to the terminal at different time zones.

According to another aspect of the present invention, there is provided a system for receiving a large-capacity content in a broadcast multicast service (BCMCS) service system, comprising: a flow recognizing unit for discriminating and storing broadcast contents having the same program identifier among a plurality of received broadcast contents; A flow comparison unit for determining a broadcast order of the broadcast contents using the flow identifier for the distinguished broadcast contents; And a flow integrating unit for integrating all of the distinguished broadcast contents according to the determined broadcast order when decoding of the distinguished broadcast contents is completed.

According to the present invention, when transmitting a large amount of content in a BCMCS service system, the transmission failure probability that may occur in a specific time period can be dispersed by transmitting the content in a plurality of time zones instead of transmitting the same at a specific time zone.

Further, according to the present invention, by distributing the reception failure probability, the competitiveness of the unicast BCMCS service is re-evaluated, and the load on the unicast service in the existing 1x EV-DO system is remarkably reduced There is an effect that can be made.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. In the following description, well-known functions or constructions that may unnecessarily obscure the subject matter of the present invention are not described in detail.

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

1, the system includes a subscriber terminal 110, 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, and a PDA (Personal Digital Assistant) capable of communicating while the user is carrying and moving.

The base station transmitter 120 transmits broadcast content in the form of packet data to the terminal 110 through a public network (Air Interface). The base station transmitter 120 includes an interface for performing signal matching between itself and the base station controller 130, a CDMA demodulator / demodulator for performing a modulation and demodulation function of a CDMA channel, a transceiver, a radio frequency ) &Lt; / RTI >

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. The base station controller 130 may also include a radio channel assignment and release function for the terminal 110 and a transmission output control function between the terminal 110 and the base station transmitter 120, a soft handoff and a hard handoff (Hard Handoff) determination. The base station controller 130 may further include a packet control function (PCF) for transmitting packet data.

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

A Packet Data Serving Node (PDSN) 150 provides a packet data service to the UE 110. The PDSN 150 is an evolution of an interworking 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 has a function of encrypting data using an encryption key in order to transmit and receive packet data via the PDSN 350 , A management function of an encryption level (Encryption Level), and a function of 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 contents 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 authenticates the BCMCS contents providers. The BCMCS controller 170 receives the BCMCS contents from the BCMCS contents server 180 or receives the BCMCS contents list and allows the terminal 110 desiring the BCMCS service to select the desired BCMCS contents. In this case, the terminal 110 stores the scheduling information of the broadcast service to which the subscriber station subscribes in the information acquisition (IA) process. Upon receiving the BCMCS flow identifier from the BCMCS controller 170 at the start of broadcasting, And receives the BCMCS program identifier to identify the BCMCS content, thereby viewing the corresponding broadcast content.

The BCMCS contents server 180 collects one or more BCMCS content contents, encrypts and stores the collected BCMCS contents. Also, the BCMCS contents server 180 finally converts the encrypted BCMCS contents into an IP-based multicast stream, and transmits the multicast stream to the PDSN 150 using the multicast transmission scheme. Here, the multicast transmission scheme is a transmission scheme in which one stream is simultaneously served to a plurality of clients, and is a data transmission scheme suitable for a broadcast service that can reduce the input / output (I / O) and network bandwidth of the 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 requesting the BCMCS service confirms the BCMCS content type and schedule through the BCMCS controller 170, the advertisement server, the SMS server, the WAP, and the web application (S210). Then, the terminal 110 registers the desired content (S220). The content recording process is not necessarily required, and the step S220 may be performed without performing the step S210. Then, the terminal 110 receives the flow identifier information, the IP address information, the port information, the header information, and the transport / application protocol information and the encryption key information from the BCMCS controller 170 (S230). Then, the terminal 110 periodically receives information on BCMCS broadcast contents currently being serviced through an overhead message from the base station transmitter 120 (S240). Then, the terminal 110 performs a registration process requesting transmission of a desired flow (S250). That is, the terminal 110 determines a 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. Thereafter, the terminal 110 receives the BCMCS contents (S260).

In the BCMCS broadcast service process, the UE 110 stores the scheduling information of the broadcast service to which the UE 110 subscribes in step S230. Among the scheduling information, the UE 110 selects a flow identifier and an IP address / Port information is stored. That is, in the BCMCS service system, the BCMCS flow identifier is expressed as a BCMCS flow identifier. The BCMCS flow identifier (hereinafter, 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, audiovisual programs such as KBS News can be distinguished as program IDs, and audio streams and video streams constituting the audiovisual program can be distinguished by flow identifiers.

In the present invention, when the BCMCS broadcasting service is provided, one content is divided into a plurality of flows for transmission when a large-capacity content is transmitted. However, as described above, when the flow ID is used as it is, the terminal 110 recognizes each BCMCS flow as being independent, so that normal decoding of the large-capacity content is impossible.

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

That is, the program ID field and the flow delimiter field are used in the same manner as before, and further include a flow count field, a first flow field, and a last flow field. The flow count field is configured to contain the number information of the flow having the same program ID and the start flow field is configured to represent the first one of the flows having the same program ID, Of the flow.

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

Referring to FIG. 3, a flow ID according to an exemplary embodiment of the present invention is represented by 24 bits, but this is only an exemplary case, and may be configured as 16 bits or 32 bits as necessary. That is, it should be noted that the number of such bits is only an option of the designer. In the illustrated example, the BCMCS flow identifier includes a 3-bit Flow Delimiter Length field, a 6-bit Program ID field, a 7-bit Flow Delimiter field, and a 6-bit Flow Delimiter field for dividing large capacity content into at least 50 A flow count field, a start field of 1 bit, and a last field of 1 bit. In this case, the order of the flow is indicated by the number of the flow ID. That is, the lower the number of the 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. 4 which will be described later.

Meanwhile, in another embodiment of the present invention, the BCMCS flow identifier includes a program ID field and an identifier ID field, which are used in the same manner as before, and further include a 6-bit flow order field A 1-bit first flow field, and a 1-bit last flow field. Here, the flow order field contains the order information for the flow, and is interpreted as being the start or the end 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 is a block diagram of a BCMCS controller according to an embodiment of the present invention.

4, the BCMCS controller includes an identifier assigning unit 171, a flow count information assigning unit 172, a view field assigning unit 173, and a content transmitting unit 174. [

The identifier assigning unit 171 divides the large-capacity content into a plurality of pieces, allocates the same program identifier to each of the divided large-capacity contents, and allocates different flow identifiers to each of the divided large-capacity contents. The flow count information assigning unit 172 assigns flow count information containing the flow identifier number information allocated to each of the divided large capacity contents. The view field assigning unit 173 allocates a start flow field indicating start large capacity content to each of the divided large capacity contents and allocates a last flow field indicating the last large capacity content. The content transmitting unit 174 transmits the divided large-capacity contents to the terminal at different time zones.

On the other hand, in the terminal 110, 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 the identifier for the content, the terminal identifies the flow having the same program ID as the same content. Further, in the case of a flow having the same program ID in order to indicate the order of each flow, the lower the number of the flow ID, the earlier the content is formed. Finally, the terminal 110 performs decoding for each flow and stores the decoding in separate storage means. When decoding of all the flows whose last flow value is set to the set 1 is completed, ) To complete an application (i.e., 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.

5, the terminal 110 includes an antenna 111, a transmission / reception unit 112, a transmission processing unit 113, a microphone 114, a reception processing unit 115, a speaker 116, a CPU 117, A display 118, and a memory 119.

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

The transmission processing unit 113 receives analog or digital voice data from the microphone 114 or receives other outgoing baseband signals (image data) from the CPU 117. [ The transmission processing unit 113 encodes, multiplexes, or digitizes the baseband signal to generate a processed baseband signal or an IF signal. The transmission / reception unit 112 receives the processed baseband signal or the transmission IF signal from the transmission processing unit 113. [ The transceiver 112 up-converts the baseband signal or the IF signal to a radio frequency (RF) signal transmitted via the antenna 111. [

The CPU 117 is a microprocessor or microcontroller. The memory 119 is coupled to the CPU 117. The memory 119 may be constituted by a random access memory (RAM). The CPU 117 executes a basic operating system (OS) program stored in the memory 119 to control the entire operation of the terminal 110. In addition, the CPU 117 may execute other processes and programs resident in the memory 119. Then, the CPU 117 can move the data into the memory 119 or out of the memory 119 in accordance with the request of the execution process.

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

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

6, the CPU 117 includes a flow recognition unit 117a, a flow comparison unit 117b, and a flow integration unit 117c in addition to the above-described functions.

The flow recognizing unit 117a receives the flow identifier, recognizes the program ID and the flow identifier, and stores the broadcast content to be requested for each program ID in the memory 119. In particular, if a different flow identifier for the same program ID is received, it can be recognized as the same broadcast content, and the start flow and last flow for the same program ID can be recognized through the start flow field and the last flow field. The flow comparing unit 117b can sort broadcast contents of the same program ID and different flow IDs stored in the memory 119 in order by comparing the flow IDs with high / low. The flow integrating unit 117c integrates the broadcast contents in the order of the flow IDs sorted through the flow comparing unit 117b.

By doing so, when a large-capacity content is transmitted in the BCMCS service system, the transmission failure probability that may occur in a specific time period can be dispersed by being transmitted in a plurality of time zones instead of transmitting in a specific time zone. As a result, the competitiveness of the unicast BCMCS service is re-evaluated, and the load on the unicast service in the existing 1x EV-DO system can be drastically reduced.

Although the present invention has been described in detail with reference to the preferred embodiments thereof, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is to be understood that the embodiments are to be considered in all respects as illustrative and not restrictive.

The scope of the present invention is defined 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 equivalents are included in the scope of the present invention. .

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

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

3 shows a flow ID structure according to an embodiment of the present invention;

4 illustrates a configuration of a BCMCS controller according to an embodiment of the present invention.

6 is a diagram showing a configuration of a CPU according to an embodiment of the present invention;

Description of the Related Art [0002]

117a: flow recognition unit

117b: Flow comparison unit

117c:

Claims

A method for transmitting a large amount of content in a BCMCS (Broadcast Multicast service) service system,

(a) dividing the large-capacity content into a plurality of blocks, allocating the same program identifier to each of the divided large-capacity contents, and allocating different flow identifiers to each of the divided large-capacity contents; And

(b) transmitting each of the divided large-capacity contents to the terminal at different time zones,

The step (a)

Further comprising the step of: allocating flow number information containing flow identifier number information allocated to each of the divided large capacity contents.

delete

The method of claim 1, wherein the step (a)

Allocating a start flow field indicating start large capacity content to each of the divided large capacity contents and allocating a last flow field indicating the last large capacity content.

The method of claim 1, wherein, in step (b)

Wherein each of the divided large-capacity contents includes the flow identifier, IP address information, and port information.

A method for receiving a large-capacity content in a BCMCS (Broadcast Multicast service) 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 contents using a flow identifier assigned to each of the distinguished broadcast contents;

(c) merging all of the distinguished broadcast contents in accordance with the determined broadcast order when decoding of the distinguished broadcast contents is completed,

And flow number information containing the number of flow identifiers allocated to each of the distinguished broadcast contents is allocated to each of the distinguished broadcast contents.

6. The method of claim 5, wherein step (b)

Wherein the broadcast order is determined to be the beginning of the distinguished broadcast content as the number of the flow identifiers is lower.

The method as claimed in claim 5 or 6, wherein the step (c)

And determining that the decoding of the distinguished broadcast contents is completed when decoding of the broadcast contents whose last field is set to three among the distinguished broadcast contents is completed.

As a large-capacity content transmission apparatus in a BCMCS (Broadcast Multicast service) service system,

An identifier allocating unit dividing the large capacity content into a plurality of large capacity contents, allocating the same program identifier to each of the divided large capacity contents, and allocating different flow identifiers to each of the divided large capacity contents; And

And a content transmitter for transmitting the divided large-capacity contents to the terminal at different time zones,

Further comprising a flow number information allocating unit for allocating flow number information for storing the flow identifier number information allocated to each of the divided large capacity contents.

delete

9. The apparatus of claim 8,

Further comprising a time field assigning unit for assigning a start flow field indicating start large capacity content and a last flow field indicating the last large capacity content to each of the divided large capacity contents.

As a large-capacity content receiving apparatus in a BCMCS (Broadcast Multicast service) 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 a broadcast order of the broadcast contents using a flow identifier allocated to the distinguished broadcast contents; And

And a flow integrating unit for integrating all of the distinguished broadcast contents according to the determined broadcast order when the decoding of the distinguished broadcast contents is completed,

12. The apparatus of claim 11,

13. The apparatus according to claim 11 or 12,

And determining that the decoding of the distinguished broadcast contents is completed when the decoding of the broadcast contents whose last field is set to the set of the distinguished broadcast contents is completed.