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 PDFInfo
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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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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
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
The system further includes a PCF 140 for supporting a packet data service provided from the PDSN 150 in cooperation with the
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
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
The
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
The configuration of the
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
6, the
The delay time calculator 551 calculates the delay time of the
The
The GRE encapsulator 552 GRE encapsulates this PPP packet for tunneling to the
6, the
The delay time calculator 551 calculates the delay time of the interval between the
The
The PPP
The ECB
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
The
6, the
The
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
Also, the broadcast content is received from the
The
Thereafter, when the
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)
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Citations (2)
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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 |
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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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