KR101448978B1 - Traffic providing apparatus and method for soft-combining in Broadcast Multicast Service system - Google Patents

Traffic providing apparatus and method for soft-combining in Broadcast Multicast Service system Download PDF

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KR101448978B1
KR101448978B1 KR1020080030837A KR20080030837A KR101448978B1 KR 101448978 B1 KR101448978 B1 KR 101448978B1 KR 1020080030837 A KR1020080030837 A KR 1020080030837A KR 20080030837 A KR20080030837 A KR 20080030837A KR 101448978 B1 KR101448978 B1 KR 101448978B1
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synchronization information
pcf
ecb
broadcast content
pdsn
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KR1020080030837A
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Korean (ko)
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KR20090105401A (en
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김연종
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에스케이플래닛 주식회사
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Abstract

An apparatus and method for providing traffic for soft combining in a BCMCS service system are disclosed in the present invention. A method according to the present invention is a method for providing traffic in soft combining in a BCMCS (Broadcast Multicast Service) system, in which after a PDSN receives BCMCS broadcast content, inserts synchronization information for soft combining into the broadcast content, (PCF) acquires synchronization information from the broadcast content, and configures the broadcast content into an error control block (ECB) including the synchronization information and transmits the result to the base station; Receiving the ECB including the information, extracting the synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information, the soft combining is stopped in the BCMCS system, The BCMCS service can be continuously provided nationwide.

BCMCS, software, traffic, synchronization, PCF, ECB, broadcasting, contents

Description

[0001] The present invention relates to a traffic providing apparatus and method for soft combining in a BCMCS service system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a BCMCS service apparatus and method, and more particularly, to an apparatus and method for providing traffic for soft combining 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 defines the multimedia broadcasting service in the CDMA band. As BCMCS means, it can be divided into BCS (Broadcast Service) and MCS (Multicast Service). BCS is a service for a specific region, and MCS is a service for a subscribed user.

Since the BCMCS broadcasts content in a predetermined slot, a soft-combining function is supported unlike the existing unicast service. That is, since only one channel is used for all terminals, it is possible to place the same contents in a slot transmitted through each sector of each base station, thereby enabling soft combining between sectors in the terminal. Here, the soft combining function is a concept similar to the conventional soft handoff, and is a technique of combining contents broadcasted in different cells at a receiving end of a terminal to increase reception gain. In order to realize the soft combining function, the most important thing is that the same contents should be broadcasted in each cell at the same time, and in order to achieve this, it is very important to synchronize the broadcast time of each cell.

Hereinafter, soft combining will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating the concept of soft combining for a cell set on a base station. Referring to FIG. 1, cells that can be controlled by one network controller (not shown) are grouped and recognized as one cell set , And the network controller transmits the same broadcast data to the soft combining cell groups, respectively. Accordingly, since the terminal repeatedly receives the same broadcast data from the base stations constituting the soft combining cell group, it can receive it more accurately.

FIG. 2 is a diagram illustrating an example of transmitting broadcast data in base stations grouped according to the soft combining of FIG.

Referring to FIG. 2, in order to support soft combining of a cell set, a network controller transmits the same broadcast data to all active cells in a soft combining area to a terminal through a wireless channel at the same time. To this end, the base stations transmit the broadcast data received from the network controller to the terminal through the wireless channel at exactly the same time.

Hereinafter, the soft combining method of the BCMCS service according to the prior art will be described based on the soft combining concept.

3 is a diagram showing a general BCMCS service system in 1x EV-DO.

3, the system includes a terminal 110 that receives and displays broadcast data, supports a soft combining function, performs both a base station transmission function and a base station control function, and provides a public interface A wireless channel assignment and release function for the terminal 110, a transmission output control function of the wireless base station 110 with respect to the terminal 110, a soft handoff and a soft handoff between the terminal 110 and the terminal 110, A GAN (General ATM Switch Network) 130 connected to the base station 120 and performing routing of packet data, a GAN 130 and a base station 120, And a PDSN 150 for providing a packet data service to the AT 110 through the AT 120. Here, the GAN 130 is composed of one master GAN 130a and a plurality of slave GANs 130b.

The system further includes a PCF 140 for supporting a packet data service provided from the PDSN 150 in cooperation with the base station 120, a subscriber authentication unit 140 for performing subscriber authentication when the authenticated terminal 100 requests packet data service A certificate server 160 for encrypting data using an encryption key, managing an encryption level, and collecting billing data for billing to transmit and receive packet data through the PDSN 150, A DLR 170 that is connected to the BS 120 and manages the location information and the paging zone of the MS 110 to support mobility of the MS 110 and control a session, A BCMCS controller 180 for providing and managing session information of the terminal 110 to the PDSN 110 and the PDSN 150 and the BCMCS CP server 190 and BCMCS contents from one or more BCMCS CPs Received, collected, and collected BCMCS content And further it includes a BCMCS CP server 190 to store.

3, in the 1x EV-DO network, a traffic path for providing a soft combining function of a BCMCS service according to the prior art is provided only between the PDSN 150 and the GAN 130. FIG.

4 is a diagram illustrating a method for providing traffic for soft combining of BCMCS services in a 1x EV-DO network according to the related art.

Referring to FIG. 4, the PDSN 150 provides content to the master GAN 130a (S201). Then, the master GAN 130a configures the contents into MAC packets, reconfigures each MAC packet in units of error control blocks (ECB), and transmits the MAC packets to the base station 120 (S202-S207). At this time, the master GAN 130a calculates a delay to each base station and adds a time stamp for each ECB transmission time point.

The base station 120 receives the ECB, calculates a time stamp included in the ECB, allocates an ECB to a slot that is exactly synchronized with the base station to which soft combining is performed, and transmits the ECB to the terminal 110 (S208-S210). The terminal 110 combines the ECB and decodes the broadcast data.

In the soft combining method of the BCMCS service according to the related art, only the master GAN 130a opens a traffic route with the PDSN 150, and the plurality of slave GANs 130b transmit broadcast data from the master GAN 130a And transmits it to each base station. However, when a failure occurs in the master GAN 130a or an abnormal operation is performed, there is a problem that not only the soft coupling is stopped in the BCMCS system but the traffic path is disconnected and the BCMCS service may be disconnected nationwide. In addition, even if the system operator finds that an overload occurs in the master GAN 130a, there is no alternative to this overload.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a BCMCS service continuously, even if a problem occurs in a traffic route through a master GAN, And to provide a device and method that can do this.

For this purpose, a method for providing soft combining traffic in a Broadcast Multicast Service (BCMCS) system according to an aspect of the present invention includes the steps of: (a) receiving a BCMCS broadcast content from a PDSN, Into the broadcast content and delivering it to the PCF; (b) the PCF acquires synchronization information from the broadcast content, and configures the broadcast content into an error control block (ECB) including the synchronization information and transmits the ECB to the base station; And (c) the base station receiving the ECB including the synchronization information, extracting synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information.

In the step (a), the PDSN forms a Generic Routing Encapsulation (GRE) tunnel with the PCF to deliver the broadcast content with the synchronization information inserted therein.

The method may further include, before the step (a), the PDSN acquiring the synchronization information based on the delay time between the PDSN and the PCF, and between the PCF and the base station.

A method for providing soft combining traffic in a BCMCS (Broadcast Multicast Service) system according to another aspect of the present invention includes the steps of: (a) receiving a BCMCS broadcast content from a PDSN and determining whether a general ATM switch network ; (b) if it is determined that the GAN does not operate normally, the PDSN inserts the synchronization information for soft combining into the broadcast content and delivers the same to the PCF; (c) the PCF acquires synchronization information from the broadcast content, and configures the broadcast content into an error control block (ECB) including the synchronization information and transmits the ECB to the base station; And (d) receiving, by the base station, an ECB including the synchronization information, extracting synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information.

In the step (b), the PDSN establishes a GRE (Generic Routing Encapsulation) tunnel with the PCF to deliver the broadcast content in which the synchronization information is inserted.

In the step (b), the synchronization information for soft combining is acquired based on a delay time between the PDSN and the PCF and between the PCF and the base station.

Meanwhile, an apparatus for providing traffic in soft combining in BCMCS (Broadcast Multicast Service) system according to an embodiment of the present invention inserts synchronization information for soft combining into BCMCS broadcast contents after receiving BCMCS broadcast contents PDSN; A PCF for acquiring synchronization information from the broadcast content and configuring the broadcast content into an error control block (ECB) including the synchronization information, and an ECB including the synchronization information, extracting synchronization information from the ECB And a base station for transmitting the broadcast contents to the terminal according to the synchronization information.

The PDSN includes: a first delay time operation unit for calculating a delay time with the PCF, receiving the delay time between the base station and the PCF from the PCF, and generating synchronization information of the broadcast content; And a GRE encapsulator for inserting the generated synchronization information into the broadcast content and encapsulating the broadcast content inserted with the synchronization information so as to tunnel the synchronization information to the PCF through a Generic Routing Encapsulation (GRE) tunnel formed with the PCF .

In addition, the PCF calculates a delay time of the PCF and the base station interval on the basis of the keep-alive time at the time of keep-alive with the base station, and outputs the calculated delay time to the PDSN A second delay time operation unit for transmitting the second delay time; Encapsulating the GRE encapsulated broadcast content received from the PDSN through the GRE tunnel and acquiring synchronization information of the broadcast content at the decapsulation; And an ECB block composing unit for composing the GRE decapsulated broadcast content into an ECB block including the synchronization information.

According to the present invention, when providing a soft combining for a BCMCS service in a 1x EV-DO network, a new traffic path using a PDSN is provided even when a failure occurs in the master GAN or an abnormal operation is performed. The BCMCS service can be continuously provided nationwide by preventing the interruption of the traffic route as well as the interruption.

Also, according to the present invention, when a soft coupling for BCMCS service is provided in a 1x EV-DO network, when an overload occurs to the master GAN, a new traffic path using the PDSN is provided, thereby reducing an overload on the master GAN .

In addition, according to the present invention, it is possible to integrate related boards between the BCMCS service and the mobile communication service by providing a new traffic path using the PDSN when providing the soft combining for the BCMCS service in the 1x EV-DO network .

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.

5 is a block diagram illustrating a BCMCS service system in a 1x EV-DO network according to an embodiment of the present invention.

5, when a problem occurs in the GAN 130 of the system shown in FIG. 3, the BCMCS service system transmits a soft message to the base station 520 through the PDSN 550 and the PCF 540, Create a new traffic path for the join.

The base station 520 performs both the base station transmission function and the base station control function in the 1x EV-DO network and transmits packet data to the terminal 110 through the air interface, Allocation and release functions of the base station 110, a transmission output control function of the base station 110 with the terminal 110, a soft handoff and a hard handoff decision. In particular, the BS 520 receives the ECB transmitted from the PCF 540, extracts the timing information from the ECB, places the ECB in the slot, and synchronizes the received ECB with the timing information, Lt; / RTI >

A Packet Control Function (PCF) 540 supports a packet data service provided from the PDSN 550 in cooperation with the BS 520. In particular, in connection with the present invention, the PCF 540 provides a PDSN 550 and a Generic Routing Encapsulation (GRE) tunnel, and configures the PPP packet as a MAC packet and the MAC packet as an ECB. At this time, the PCF 540 inserts the timing information into the ECB header when configuring the MAC packet as an ECB.

The PDSN 550 is connected to the PCF 540 and becomes an end node for connecting to the Internet or another network for data service in the 1x EV-DO network. In particular, in accordance with the present invention, the PDSN 550 receives BCMCS broadcast content and checks whether the GAN (General ATM Switch Network) operates normally. If it is determined that the GAN does not operate normally, And the PCF 540 and calculates the timing information. In addition, the PDSN 550 receives the content for the BCMCS service from the BCMCS CP server 180 and configures it as a PPP packet, and encapsulates the PPP packet for GRE tunneling. At this time, the PDSN 550 inserts the timing information into the GRE capsule.

The configuration of the PDSN 550, the PCF 540, and the BS 520 corresponding to the traffic path for soft combining according to an embodiment of the present invention will be described in detail with reference to FIG.

6 is a diagram illustrating a traffic providing apparatus for soft combining of BCMCS services in an EV-DO network according to an embodiment of the present invention. In FIG. 6, a soft combining process is performed by a base station 520 via a PDSN 550 and a PCF 540. FIG. Lt; RTI ID = 0.0 > a < / RTI >

6, the PDSN 550 includes a delay time calculating unit 551, a GRE encapsulating unit 552, a PPP packet forming unit 553, and a content receiving unit 554.

The delay time calculator 551 calculates the delay time of the PDSN 550 and the PCF 540 based on the keep-alive time at the time of keep-alive between the PDSN 550 and the PCF 540 And receives the delay time between the PCF 540 and the base station 520 and the PCF 540 to generate synchronization information of broadcast contents.

The content receiving unit 554 receives the broadcast content from the BCMCS CP server 180 and the PPP packet forming unit 553 transmits the content to the PCF 540 in order to establish a connection based on a Point-to-Point Protocol (PPP) PPP packet.

The GRE encapsulator 552 GRE encapsulates this PPP packet for tunneling to the PCF 540 via the GRE tunnel. At this time, the GRE encapsulator 552 encapsulates the synchronization information of the broadcast content generated by the delay time calculator 551 for each PPP packet, encapsulates the encapsulated GRE into GRE encapsulation, and transmits the encapsulated GRE to the PCF 540 through the GRE tunnel. .

6, the PCF 540 includes a delay time calculation section 541, a GRE decipherment section 542, a PPP packet release section 543, an ECB configuration section 544, an ECB transmission section 545, And a synchronization information storage unit 546. [

The delay time calculator 551 calculates the delay time of the interval between the PCF 540 and the base station 520 on the basis of the keep-alive required time at the time of keep-alive between the PCF 540 and the base station 520 And transmits the computed delay time to the PDSN 550. [

The GRE decapsulation unit 542 decodes the GRE encapsulation received from the PDSN 550 through the GRE tunnel to generate a PPP packet, acquires the synchronization information of the broadcast content at the time of decapsulation, 546).

The PPP packet releasing unit 543 segments the PPP packet generated by the GRE decapsulating unit 542 into MAC packets.

The ECB block construction unit 544 constructs this MAC packet together with the ECB header as an ECB block. That is, the ECB block composing unit 544 groups broadcast service packets composed of MAC packets into a predetermined unit, and forms an error control block (ECB) through Reed-Solomon coding. Hereinafter, the ECB will be described in more detail.

Referring to FIG. 7, the ECB includes a data packet K * M that forms a data portion, a parity packet R * M for a parity portion, and a MAC And an ECB header composed of a packet. The data packet is in the form of packetized broadcast content, and the parity packet is added to perform parity check to detect whether the data packet is erroneous. In particular, the ECB block composing unit 544 reads the synchronization information of the broadcast content from the synchronization information storage unit 546 and records the synchronization information in the ECB header.

The ECB transmitting unit 545 transfers this ECB to the base station 520. [

6, the base station 520 includes a slot transmission unit 521, a synchronization information analysis unit 522, and an ECB reception unit 523.

The ECB receiving unit 523 receives the ECB from the PCF 540. The synchronizing information analyzing unit 522 extracts the synchronizing information from the ECB and transmits the extracted synchronizing information to the slot transmitting unit 521. When the slot transmitting unit 521 receives the synchronizing information And transmits the broadcast contents to the terminal 110 according to the broadcast contents.

By doing so, a new traffic path for soft combining of BCMCS services in a 1x EV-DO network can be created.

Hereinafter, a traffic providing method for soft combining of BCMCS services in a 1x EV-DO network according to an embodiment of the present invention will be described with reference to FIG.

The delay time calculator 551 receives the delay time between the base station 520 and the PCF 540 from the PCF 540 and calculates the delay time between the PCF 540 and the PDSN 550, (S801). These delay times are calculated based on the keep-alive time at the time of keep-alive between the BS 520 and the PCF 540, the PCF 540 and the PDSN 550, .

Also, the broadcast content is received from the BCMCS CP server 180, and the PPP packet forming unit 553 forms the broadcast content into a PPP packet (S802). Then, the GRE encapsulator 552 inserts the synchronization information into the broadcast content composed of the PPP packet, encapsulates it in a GRE, and transmits the GRE encapsulation to the PCF 540 through GRE tunneling (S803-S804).

The GRE decapsulation unit 542 of the PCF 540 decapsulates the GRE encapsulated through the GRE tunneling to generate the PPP packet and obtains the synchronization information and stores it in the synchronization information storage unit 546 (S805) . Next, the PPP packet releasing unit 543 constructs a PPP packet corresponding to the broadcast content as a MAC packet, and configures an ECB (Error Control Block) based on the MAC packet (S806). At this time, the PPP packet release unit 543 acquires the synchronization information from the synchronization information storage unit 546 and inserts the synchronization information into the ECB header (S807). The structure of this ECB has been described with reference to FIG. 7, and therefore will not be described here. Then, the ECB transmitting unit 545 transmits the ECB to the base station 120 (S808).

Thereafter, when the ECB reception unit 523 of the base station 520 receives the ECB, the synchronization information analysis unit 522 analyzes the synchronization information from the ECB and transfers the information to the slot transmission unit 521, And transmits the broadcast contents to the terminal 110 according to the synchronization information (S809-S811).

Accordingly, when a soft coupling is provided for a BCMCS service in a 1x EV-DO network, a soft link is stopped in a BCMCS system by providing a new traffic path using a PDSN even when a failure occurs in a master GAN or an abnormal operation is performed In addition, the BCMCS service can be continuously provided nationwide by preventing the traffic route from being disconnected, and when an overload occurs in the master GAN, the overload of the master GAN can be reduced by providing a new traffic route using the PDSN, It is possible to integrate the related boards between the BCMCS service and the mobile communication service.

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 shows the concept of soft combining for a cell set on a base station; Fig.

FIG. 2 illustrates an example of transmitting broadcast data in base stations grouped according to the soft combining in FIG. 1; FIG.

3 is a block diagram illustrating a conventional BCMCS service system in 1x EV-DO;

4 is a diagram illustrating a method for providing traffic for soft combining of BCMCS services in a 1x EV-DO network according to the prior art;

5 is a configuration diagram illustrating a BCMCS service system in a 1x EV-DO network according to an embodiment of the present invention;

FIG. 6 illustrates a traffic providing apparatus for soft combining of BCMCS services in an EV-DO network according to an embodiment of the present invention. FIG.

7 illustrates a structure of an ECB according to an embodiment of the present invention.

8 is a flowchart illustrating a method for providing traffic for soft combining of BCMCS services in a 1x EV-DO network according to an embodiment of the present invention.

Description of the Related Art

520: base station

540: Packet Control Function (PCF)

550: PDSN

Claims (14)

A method of providing traffic in soft combining in a BCMCS (Broadcast Multicast Service) system, (a) after the PDSN receives the BCMCS broadcast content, inserting synchronization information for soft combining into the broadcast content and delivering it to the PCF; (b) the PCF acquires synchronization information from the broadcast content, and configures the broadcast content into an error control block (ECB) including the synchronization information and transmits the ECB to the base station; And (c) receiving, by the base station, an ECB including the synchronization information, extracting synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information. The method of claim 1, wherein the step (a) Wherein the PDSN establishes a Generic Routing Encapsulation (GRE) tunnel with the PCF to deliver the broadcast content in which the synchronization information is inserted. 3. The method according to claim 1 or 2, wherein, before the step (a) Further comprising the step of the PDSN acquiring the synchronization information based on a delay time between the PDSN and the PCF and between the PCF and the base station. 4. The method according to claim 3, And obtaining the keep-alive time based on the keep-alive time between the PDSN and the PCF, and keep-alive between the PCF and the base station. The method of claim 1 or 2, wherein the step (b) And configuring the ECB by including the synchronization information in the ECB header. The method of claim 1 or 2, wherein the step (b) Wherein the broadcast contents are grouped into a predetermined unit and configured as an ECB through Reed-Solomon coding. A method of providing traffic in soft combining in a BCMCS (Broadcast Multicast Service) system, (a) receiving a BCMCS broadcast content from a PDSN and confirming whether a general ATM switch network (GAN) operates normally; (b) if it is determined that the GAN does not operate normally, the PDSN inserts the synchronization information for the soft combining into the broadcast content and delivers the same to the PCF; (c) the PCF acquires synchronization information from the broadcast content, and configures the broadcast content into an error control block (ECB) including the synchronization information and transmits the ECB to the base station; And (d) receiving, by the base station, an ECB including the synchronization information, extracting synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information. 8. The method of claim 7, wherein step (b) Wherein the PDSN establishes a Generic Routing Encapsulation (GRE) tunnel with the PCF to deliver the broadcast content in which the synchronization information is inserted. The method as claimed in claim 7 or 8, wherein the step (b) And the synchronization information for soft combining is acquired based on a delay time between the PDSN and the PCF and between the PCF and the base station. In BCMCS (Broadcast Multicast Service) system, A PDSN for receiving BCMCS broadcast content and inserting synchronization information for soft combining into the broadcast content; A PCF for obtaining synchronization information from the broadcast content and configuring the broadcast content into an ECB (Error Control Block) including the synchronization information; And a base station receiving the ECB including the synchronization information, extracting synchronization information from the ECB, and transmitting the broadcast content to the terminal according to the synchronization information. 11. The method of claim 10, A first delay time operation unit for calculating a delay time with the PCF, receiving the delay time between the base station and the PCF from the PCF, and generating synchronization information of the broadcast content; And And a GRE encapsulator for GRE encapsulating the broadcast content inserted with the synchronization information so that the generated synchronization information can be inserted into the broadcast content and tunneled to the PCF through a Generic Routing Encapsulation (GRE) tunnel formed with the PCF Characterized in that: 12. The apparatus of claim 11, wherein the first delay time calculator comprises: And calculates a delay time with the PCF based on the keep-alive required time during a keep-alive between the PDSN and the PCF. 13. The method as claimed in claim 11 or 12, Calculates a delay time of the PCF and the base station interval on the basis of the keep-alive required time during a keep-alive with the base station, and transmits the computed delay time of the PCF and the base station interval to the PDSN A second delay time calculator for receiving the second delay time; Encapsulating the GRE encapsulated broadcast content received from the PDSN through the GRE tunnel and acquiring synchronization information of the broadcast content at the decapsulation; And And an ECB block constructing unit configured to construct the GRE decapsulated broadcast content into an ECB block including the synchronization information. 14. The apparatus of claim 13, wherein the ECB block constructing unit comprises: Wherein the broadcast contents are grouped into a predetermined unit and configured as ECB (Error Control Block) through Reed-Solomon coding.
KR1020080030837A 2008-04-02 2008-04-02 Traffic providing apparatus and method for soft-combining in Broadcast Multicast Service system KR101448978B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060082378A (en) * 2005-01-12 2006-07-18 삼성전자주식회사 Apparatus and method for combining of receiving data in a mobile communication system
KR100762669B1 (en) 2004-03-15 2007-10-01 삼성전자주식회사 Method and system for soft combining in multimedia broadcast/multicast service system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100762669B1 (en) 2004-03-15 2007-10-01 삼성전자주식회사 Method and system for soft combining in multimedia broadcast/multicast service system
KR20060082378A (en) * 2005-01-12 2006-07-18 삼성전자주식회사 Apparatus and method for combining of receiving data in a mobile communication system

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