KR101087684B1 - Method and System for Providing Multimedia Broadcast/Multicast Service by Using Plural Radio Access Stations for Use in Portable Internet Network - Google Patents

Abstract

The present invention relates to a method and system for providing an MBMS using a plurality of radio access stations in a portable internet network.

The present invention relates to a service cell providing a personal subscriber station (PSS: hereinafter referred to as 'PSS') and a multimedia broadcast multicast service (MBMS) to a PSS. Provided service cell RAS (Radio Access Station), adjacent cell RAS providing neighbor cell which is an area where PSS can receive signals adjacent to service cell, and access control router (ACR) A method of providing an MBMS to a PSS in a portable Internet system including an IP network, a home network server, and a content providing server providing broadcast content for providing an MBMS, the method comprising: (a) a content providing server through a portable internet network; Requesting the MBMS and receiving the MBMS through the serving cell RAS; (b) measuring the pilot strength of the signal received from the neighbor cell RAS to determine whether the pilot strength of the neighbor cell RAS is greater than or equal to T_ADD, the handover execution threshold; (c) if it is determined in step (b) that the pilot strength of the neighbor cell is greater than or equal to T_ADD, transmitting an MBMS Registration Request (MBMS REG-REQ) message and a PSSHO-REQ (PSSHO-REQ) message to the serving cell RAS; ; (d) checking, by the serving cell RAS, the received MBMS REG-REQ message and the PSSHO-REQ message to determine whether adjacent cells are the same soft handover group; (e) if it is determined in step (d) that the neighbor cells are the same soft handover group, the serving cell RAS determines whether the neighbor cell RAS transmits the same MBMS; (f) if it is determined in step (e) that the neighboring cell RAS transmits the same MBMS, the neighboring cell RAS transmits the broadcast content to the PSS. It provides a method for providing MBMS.

According to the present invention, the MBMS can be provided to the personal subscriber station by providing the MBMS to the personal subscriber station even in a cell having a signal strength or more capable of providing the MBMS to the personal subscriber station among cells adjacent to the service cell that provides the MBMS to the personal subscriber station. The transmission power of the provided radio access station (RAS) can be lowered. In addition, by lowering the transmission power, it is possible to efficiently use power, thereby saving system resources.

Mobile Internet, MBMS, Soft Combined, Pilot Strength, Soft Handover

Description

Method and System for Provisioning Multimedia Broadcast / Multicast Service by Using Plural Radio Access Stations for Use in Portable Internet Network}

1 is a diagram illustrating a cell by cell activation method in an MBMS providing method;

FIG. 2 is a diagram illustrating providing content to a personal subscriber station (PSS: Personal Subscriber Station (PSS)) in a soft handover group activation method in the MBMS scheme.

3 is a diagram schematically illustrating an MBMS transmission system using cell grouping in a portable Internet network according to a preferred embodiment of the present invention;

4A is a diagram illustrating reception of broadcast content of a PSS when the PSS is located between a serving cell and an adjacent cell belonging to different soft handover groups;

4B is a diagram illustrating reception of broadcast content of a PSS when the PSS belongs to the same soft handover group and is located between a serving cell and an adjacent cell that simultaneously transmit the same broadcast content.

4C is a diagram illustrating receiving PSS broadcast content when the PSS is located between a serving cell and an adjacent cell belonging to the same soft handover group and only the serving cell transmits broadcast content.

5A to 5B are diagrams illustrating an MBMS providing method using cell grouping in a portable Internet network according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

310: personal subscriber station (PSS)

321: Service Cell Radio Access Station

320: mobile Internet network 321a: service cell

322: adjacent cell radio access station

322a: neighbor cell 323: access control router

325: home agent 326: authentication server

327: IP network 340: Internet

350: content providing server

The present invention relates to a method and system for providing an MBMS using a plurality of radio access stations in a portable internet network. More specifically, a signal strength capable of providing an MBMS to a personal subscriber station among cells adjacent to a service cell that provides a multicast multimedia broadcasting service (MBMS: Multimedia Broadcast / Multimedia Service, hereinafter referred to as MBMS) to a personal subscriber station. The present invention relates to a method and a system for providing an MBMS using a plurality of radio access stations in a portable Internet network that allows a cell to provide an MBMS to a personal subscriber station.

Today, due to the development of communication technology, the services provided in the code division multiple access (CDMA) or orthogonal frequency division modulation (OFDMA) mobile communication system are not only circuit services but also packets. It is developing into a multicasting multimedia communication that transmits a large amount of data such as data, multimedia data. In order to support such multicasting multimedia communication, a broadcast / multicast service that provides a service from a single data source to a plurality of personal subscriber stations (PSSs). The broadcast / multicast service is a message-oriented service, generally a cell broadcast service, and a multicast multimedia broadcasting service that supports multimedia forms such as real-time video, real-time voice, still image, and text. It can be divided into (Multimedia Broadcast / Multimedia Service).

In addition, the multicast multimedia broadcasting service generally uses a cell-by-cell activation method that provides content only to a service cell in which the PSS to be serviced and a PSS receiving the service are expected to handover. Provides content using the Soft Handover Group Activation method, which designates a service cell that provides content to a cell and several cells located near the service cell as a group to provide content to all cells included in the group. do.                         

1 is a diagram illustrating a cell-by-cell activation method in a multicast multimedia broadcasting service providing method, and FIG. 2 is a soft handover group activation in a multicast multimedia broadcasting service system. It is a figure which shows providing content.

Referring to FIG. 1, the cell-by-cell activation method is a PSS (1c) when the PSS 1c is located in a cell formed by one or more Radio Access Stations (RAS) (not shown) (not shown). The content is provided to the PSS 1c only in one cell in which 1c) is located. Here, when the cell in which the PSS 1c is located is called a serving cell 1a and the remaining cells in the vicinity are called an adjacent cell 1b, the PSS 1c is a multicast multimedia broadcasting service to the service cell 1a. When a BMCS Flow Registration Message is transmitted, the service RAS located in the service cell 1a and forming the service cell 1a provides content to the PSS 1c. In this case, the neighbor cell 1b does not provide content to the PSS.

Therefore, a problem arises in that the content is not transmitted only to the service cell 1a because the PSS 1c is close to the adjacent cell 1b capable of receiving a signal.

Referring to FIG. 2, the soft handover group activation method is performed when the PSS 2d is located in a cell formed by one or more Radio Access Stations (RAS). The PSS 2d is expected to move to another cell, so that one cell and a plurality of neighboring cells that the PSS 2d can move to are grouped and contents are provided to the entire group. In this case, the cell in which the PSS 2d is located is adjacent to the serving cell 2a, the serving cell 2a and the serving cell 2a, and the service group 2b and the service group that bind the movable cells of the PSS 2d. When the remaining cells other than 2b) are called neighbor cells 2c, when the PSS 2d transmits a registration message (BCMCS Flow Registration Message) requesting the multicast multimedia broadcasting service to the serving cell 2a, the serving cell 2a And RASs of all the cells constituting the service group 2b can provide content to the PSS 2d.

In addition, the PSS 2d is basically provided with the content from the service cell 2a, and also from the cell in the vicinity when the PSS 2d is located in the cell near the service cell 2a in the same soft handover group. It can be provided at the same time to receive data from multiple cells to perform a soft combining (Soft Combining) to receive the content at an improved transmission rate.

However, since the conventional method provides content by grouping a predetermined number of cells, it may have the following problem.

First, when all of the cells capable of soft handover are used as one group, when the number of cells capable of soft handover is large, unnecessary transmission traffic is generated because the content must be provided to all cells of the group. In other words, since there is no PSS receiving the actual content, the radio resources are wasted because the content must be provided to cells that are not helpful in providing the actual content.

In addition, when the cells capable of soft handover are divided into a plurality of groups, the PSS is a neighboring group even though soft handover is possible when the PSS moves from a service group that provides content to the PSS to an adjacent group that does not provide the content. Since the content cannot be provided from the service group, the content reception performance is degraded because the content is received from the service group before the soft handover, and if the content is completely dropped from the service group, the temporary content reception may be interrupted.

In order to solve this problem, the present invention provides a MBMS to a personal subscriber station among neighboring cells of a service cell that provides a multicast multimedia broadcasting service (MBMS: Multimedia Broadcast / Multimedia Service, hereinafter referred to as MBMS) to a personal subscriber station. It is an object of the present invention to provide a method and system for providing an MBMS using a plurality of radio access stations in a portable Internet network that allows a cell having a signal strength of at least to provide an MBMS to a personal subscriber station.

Therefore, according to a first preferred aspect of the present invention, a personal subscriber station (PSS: hereinafter referred to as 'PSS') and a PSS multimedia broadcast multicast service (MBMS: Multimedia Broadcast / Multimedia Service, hereinafter referred to as 'MBMS') A service cell RAS (Radio Access Station) providing a service cell, a neighbor cell RAS providing an adjacent cell which is an area where the PSS can receive signals, and an access control router (ACR). PSS in a portable Internet or WiBro (Wireless Broadband Internet) system including an access control router (hereinafter referred to as an 'ACR'), an IP network, a home network server, and a content providing server providing broadcast content for providing an MBMS. A method of providing an MBMS service, comprising: (a) requesting an MBMS to a content providing server through a mobile Internet system and receiving an MBMS through a service cell RAS; step; (b) measuring the pilot strength of the signal received from the neighbor cell RAS to determine whether the pilot strength of the neighbor cell RAS is greater than or equal to T_ADD, the handover execution threshold; (c) if it is determined in step (b) that the pilot strength of the neighbor cell is greater than or equal to T_ADD, transmitting an MBMS Registration Request (MBMS REG-REQ) message and a PSSHO-REQ (PSSHO-REQ) message to the serving cell RAS; ; (d) checking, by the serving cell RAS, the received MBMS REG-REQ message and the PSSHO-REQ message to determine whether adjacent cells are the same soft handover group; (e) if it is determined in step (d) that the neighbor cells are the same soft handover group, the serving cell RAS determines whether the neighbor cell RAS transmits the same MBMS; And (f) if it is determined in step (e) that the neighboring cell RAS transmits the same MBMS, the neighboring cell RAS transmits the broadcast content to the PSS. It provides a method for providing MBMS.

In addition, according to a second object of the present invention, a personal subscriber using a plurality of radio access stations (RAS) in a portable Internet (Wireless Broadband Internet) system A system for providing a multimedia broadcast multicast service (MBMS: MBMS) to a terminal, comprising: a pilot of signals received from an adjacent cell around a service cell in which an MBMS is requested and a mobile station is located; Pilot) Measures the strength of the signal and generates an MBMS Registration Request message (hereinafter referred to as an MBMS REG-REQ message) when the pilot signal is greater than or equal to the handover performance threshold T_ADD. Personal Subscriber Station (PSS) that generates a PSSHO-REQ message containing information , Hereinafter referred to as 'PSS'; A content providing server providing broadcast content according to the MBMS request of the PSS; A service cell RAS which transmits broadcast content received from a content providing server to a PSS located in a service cell in which a data transmission / reception service is available and receives an MBMS registration request message and a PSSHO-REQ message from the PSS; A neighboring cell RAS that forms a neighboring cell capable of providing data transmission / reception services to the PSS as a neighboring RAS of the serving cell, and provides an MBMS to the PSS when the PSS is located near the neighboring cell; An access control router (ACR), which is connected to the serving cell RAS and the neighbor cell RAS based on an IP protocol and controls the serving cell RAS and the neighbor cell RAS; And an IP network (Internet Protocol Network) connected to the ACR and the content providing server to relay data transmitted and received between the ACR and the content providing server. to provide.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In an embodiment of the present invention, for the convenience of description, a multimedia broadcast / multicast service (MBMS), which is a service for providing broadcast content through a portable Internet network, is provided. Assuming that a personal subscriber station is located between two radio access stations, a cell in which the personal subscriber station is located is called a serving cell, and a cell in which the personal subscriber station can provide radio data transmission / reception among a plurality of adjacent cells of the service cell. Assume that it is an adjacent cell. Here, in the preferred embodiment of the present invention, it is assumed that there is only one neighboring cell. However, the present invention is not limited thereto, and several neighboring cells may be present.

In addition, in the embodiment of the present invention, the neighbor cells may belong to the same soft handover group as the serving cell or may belong to different soft handover groups.

3 is a diagram schematically illustrating a system for providing soft handover in a portable Internet network according to a preferred embodiment of the present invention.

As shown in FIG. 3, the soft handover providing system according to the preferred embodiment of the present invention includes a personal subscriber station (PSS) 310, a portable Internet network, or the like. WiBro: may include a Wireless Broadband Internet (320), an Internet 340, a content providing server 350, and the like.

Herein, the portable Internet network 320 according to the preferred embodiment of the present invention includes a service cell radio access station (RAS), a neighbor cell radio access station, and an access control router (ACR). Control Router, hereinafter referred to as 'ACR'), IP network, home agent (HA, Home Agent, hereinafter 'HA') and authentication server (AAA: Authentication, Authorization, Accounting) and the like.

In addition, an area formed by the service cell RAS 321 to provide content to the PSS 310 is called a service cell 321a and can be adjacent to the service cell 321a to provide a signal to the PSS 310. The area formed by the cell RAS 322 is called an adjacent cell 322a.

The PSS 310 refers to a mobile communication terminal using a portable Internet service by accessing the portable Internet network 320 by an Orthogonal Frequency Division Modulation / Multiplexing Access (OFDMA), and using a low power RF (Radio Frequency) / It performs IF (Intermediate Frequency) module and controller function, MAC (Media Access Control) frame variable control function, handover function, authentication and encryption function according to service characteristics and propagation environment.

PSS 310 according to a preferred embodiment of the present invention requests the MBMS for providing the broadcast content to the content providing server 350 through the portable Internet network 320, if the mobile content begins to receive the broadcast content through the mobile Internet The MBMS Registration Request Message (hereinafter referred to as an MBMS REG-REQ message) is transmitted to the mobile RAS 321 for each registration period set in the network 320. In addition, the PSS 310 according to an exemplary embodiment of the present invention measures a pilot size of a signal provided by a plurality of neighboring cells that do not provide broadcast content to the PSS 310, and is a threshold for performing handover. If a cell larger than T_ADD (or PilotADD) exists, the MBMS REG-REQ message is transmitted to the serving cell RAS 321. At this time, the PSS 310 transmits a PSSHO-REQ (PSS Hand-Over Request) message including information on the pilot strength of neighboring cells that can transmit and receive data.

The PSS 310 according to the preferred embodiment of the present invention is a soft combine when the PSS 310 is located between a serving cell and a neighboring cell belonging to the same soft handover group and the serving cell and the neighboring cell simultaneously transmit the same broadcast content. It is a terminal that receives broadcast content from both cells by an inning function and receives a reception speed.

The service cell RAS 321 according to the preferred embodiment of the present invention transmits data received from the ACR 323 as an access point (AP) of a portable Internet network to the PSS 310 or received from the PSS 310 wirelessly. It transmits data to ACR (323), low power RF / IF module and controller function, OFDMA / TDD packet scheduling and channel multiplexing function, MAC frame variable control function according to service characteristics and propagation environment, 50 Mbps high speed traffic real time control Function, handover function, and the like.

The service cell RAS 321 according to the preferred embodiment of the present invention forms a service cell capable of providing broadcast content to the PSS 310 and receives an MBMS REG-REQ message and a PSSHO-REQ message from the PSS 310. do. Here, the service cell RAS 321 according to the preferred embodiment of the present invention checks the MBMS REG-REQ message to confirm the broadcast content service to be provided by the PSS 310, and provides the broadcast content service to the content providing server 350. Request and provide it to the PSS 310. In addition, the serving cell RAS 321 according to the preferred embodiment of the present invention has a neighboring cell having a received signal strength equal to or greater than the T_ADD value among cells adjacent to the serving cell where the PSS 310 is located through the MBMS REG-REQ message. Check it. Accordingly, when the service cell RAS 321 receives the MBMS REG-REQ message from the PSS 310, the service cell RAS 321 may recognize that the PSS 310 may receive broadcast content from an adjacent cell.

In addition, the serving cell RAS 321 is a message that all PSS 310 must receive unconditionally and transmits an MBMS overhead message containing important system information once at least within 1.28. Here, the MBMS overhead message according to the preferred embodiment of the present invention is a Downlink Channel Description (DDC) message in which a burst profile characteristic of a downlink physical channel is defined and a DL map message defining access to downlink information. ) Additionally includes an 'ON / OFF' field, a 'Soft Available Indication' field, and a 'Registration Required for Dynamic MBMS' field.

In addition, the service cell RAS 321 according to the preferred embodiment of the present invention can know the pilot strength of the neighbor cell that the PSS 310 can receive a signal through the PSSHO-REQ message, so that the PSS 310 It is possible to determine which of the cells of the cell can receive the broadcast content. At this time, the serving cell RAS 321 requests an adjacent cell RAS 322 to provide the broadcast content to the PSS 310 if the neighboring cell RAS 322 is the same soft handover group. To the neighbor cell RAS 322.

The neighbor cell RAS 322 according to the preferred embodiment of the present invention can wirelessly transmit data received from the ACR 323 to the PSS 310, and the neighbor cell RAS 322 according to the preferred embodiment of the present invention is When the service cell RAS 321 receives an erasable message including a request for providing broadcast content to the PSS 310, the service cell RAS 321 provides the same broadcast content to the PSS 310 as the service cell RAS 321.

4A is a diagram illustrating reception of broadcast content of a PSS when the PSS is located between a serving cell and a neighboring cell belonging to different soft handover groups, and FIG. 4B is a diagram of PSS belonging to the same soft handover group and simultaneously receiving the same broadcast content. 4C is a diagram illustrating reception of broadcast content of a PSS when a serving cell and a neighboring cell are located between the transmitting cell and the neighboring cell. FIG. 4C shows that the PSS is located between a serving cell and a neighboring cell belonging to the same soft handover group, and only the serving cell transmits broadcast content. In this case, the broadcast content of the PSS is illustrated.

Referring to FIG. 4A, when the PSS 410 according to the preferred embodiment of the present invention is a soft handover group in which the serving cell and the adjacent cell are different from each other, the PSS 410 broadcasts only from the serving cell RAS 421 of the serving cell. The content is provided and the PSS 410 performs a soft combine. In this case, the PSS 410 may not receive broadcast content from an adjacent cell belonging to another soft handover group.

Referring to FIG. 4B, when the serving cell and the neighboring cell are the same soft handover group and simultaneously provide the same broadcast content, the PSS 410 is the serving cell and the neighboring cell. It is possible to receive soft broadcast content from everyone and perform soft combining.

Referring to FIG. 4C, when the PSS 410 according to the preferred embodiment of the present invention provides the broadcast content only in the service cell in which the service cell and the neighbor cell are the same soft handover group but the PSS 410 is located, first, the PSS 410 transmits an MBMS REG-REQ message, which is a BMCS Flow Registration Message, to the service cell RAS 421. In this case, the PSS 410 preferably transmits a PSSHO-REQ message together. The serving cell RAS 421 also transmits an MBMS overhead message to the PSS 410.

 Subsequently, since the serving cell and the neighbor cell are the same soft handover group, the serving cell RAS 421 receiving the MBMS REG-REQ message is broadcasted to the neighbor cell RAS 422 by the neighbor cell RAS 422 to the PSS 410. Send an elevable report requesting to send content. Subsequently, the neighbor cell RAS 422 receiving the elevable report transmits broadcast content such as the service cell RAS 421 to the PSS 410. In this case, the PSS 410 may receive soft broadcast content from both the serving cell and the adjacent cell to perform soft combining.

The ACR 323 is an access control router that accommodates a plurality of RASs. The ACR 323 has a handover control function between a plurality of RASs, a handover function between a plurality of ACRs, a packet routing function, an Internet access function, and the like, and accesses an IP network 350. do. In addition, the ACR 323 performs a handover control function to ensure high-speed mobility between a plurality of ACRs, and for this purpose, the RAS (321, 322) and the ACR 323 are connected based on an IP (Internet Protocol) protocol. do. It is also based on a Gigabit Ethernet switch for high speed packet transmission.

Here, the ACR 323 according to the preferred embodiment of the present invention is located between the RAS 321 and 322 and the IP network 327 to relay data transmission and reception between the RAS 321 and 322 and the IP network 327. . In more detail, when the ACR 323 according to the preferred embodiment of the present invention receives an access request of the PSS 310 received through the transmitting RAS 321, the ACR 323 allocates an IP to the PSS 310 and the PSS 310. If there is a broadcast content providing request, the broadcast content transmission and reception between the content providing server 350 and the PSS 310 is relayed through the IP network 327 and the Internet 340.

In addition, the ACR 322 according to the preferred embodiment of the present invention transmits an erasure message of the serving cell RAS 321 to the neighbor cell RAS 322.

The HA 325 performs routing for transmitting a packet from an external packet data service server including the Internet 340, and the AAA 326 works with the RAS 321 to transmit packet data used by the PSS 310. Charge for and authenticate the connection from the PSS 310.

The IP network 327 connects the ACR 323, the HA 325, the AAA 326, the home network server 350, and receives the packet data from an external packet data service including the Internet 340. Transmit to ACR 323.

Here, the IP network 327 according to the preferred embodiment of the present invention transmits the connection request of the PSS 310 received from the ACR 323 to the HA 325 and the AAA 326 and broadcast contents of the PSS 310. The request is transmitted to the content providing server 350.

The home network server 350 according to a preferred embodiment of the present invention is a server for providing broadcast content to the PSS 310. When providing broadcast content, the home network server 350 groups nearby cells including a service cell in which the PSS 310 is located. The broadcast content is provided to the group using a multicasting scheme.

In addition, the content providing server 350 according to the preferred embodiment of the present invention confirms that the PSS 310 is a subscriber of the content providing server 350 through a user ID received together with the broadcast content request of the PSS 310.

5A to 5B illustrate a method for providing soft handover in a portable Internet network according to a preferred embodiment of the present invention.

First, the PSS 310 requests MBMS, a service for providing broadcast content to the content providing server 350 through the service cell RAS 321 of the portable Internet network 320 (S510). Subsequently, the service cell RAS 321 transmits the broadcast content from the content providing server 350 to the PSS 310 (S520).

Subsequently, the PSS 310 measures pilot strength of a signal received from the neighbor cell RAS 321 of the neighbor cell 321a capable of receiving radio waves (S530). Subsequently, the PSS 310 determines whether the pilot strength of the signal received from the neighbor cell RAS 322 is greater than or equal to T_ADD (S540).

If the pilot strength of the signal received from the neighbor cell RAS 322 in step S540 is greater than or equal to T_ADD, the PSS 310 transmits an MBMS REG-REQ message and a PSSHO-REQ message to the serving cell RAS 321 (S543). ).

Subsequently, the service cell RAS 321 checks the received MBMS REG-REQ message and the PSSHO-REG message (S545) and determines whether the adjacent cell 322a is a soft handover group such as the service cell 321a (S550). .

If it is determined in step S550 that the soft handover group is the same as the neighbor cell S322a and the serving cell 321a, it is determined whether the neighbor cell RAS S322 transmits the same broadcast content as the serving cell RAS 321 (S560). ).

Subsequently, if it is determined in step S560 that the neighbor cell RAS 322 transmits the same broadcast content as the service cell RAS 321, the neighbor cell RAS 322 also broadcasts the content to the PSS 310 together with the service cell RAS 321. Send.

Subsequently, when the PSS 310 requests the content providing server 350 to terminate the service, the above process is terminated.

If the pilot strength of the signal received from the neighbor cell RAS 322 is less than or equal to T_ADD in step S540, the flow proceeds to step S530.

If it is determined in step S550 that the soft handover group is not the same as the neighbor cell S322a and the service cell 321a, the flow proceeds to step S530.

If it is determined in step S560 that the neighbor cell RAS 322 does not transmit the same broadcast content as the service cell RAS 321, the service cell RAS 321 broadcasts the broadcast content to the PSS 310 to the neighbor cell RAS 322. The electronic device transmits an erasure report including a content to transmit (S565) and proceeds to step S563.                     

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, an MBMS is transmitted to a personal subscriber station from among cells adjacent to a service cell that provides a multimedia broadcast multicast service (MBMS: Multimedia Broadcast / Multimedia Service, hereinafter referred to as MBMS) to a personal subscriber station. By providing the MBMS to the personal subscriber station even in a cell having a signal strength that can provide the UE, the transmission power of the radio access station (RAS: Radio Access Station) providing the MBMS to the personal subscriber station can be reduced. In addition, by lowering the transmission power, it is possible to efficiently use power, thereby saving system resources.

Claims (13)

Providing a service cell for providing a personal subscriber station (PSS: Personal Subscriber Station, hereinafter referred to as 'PSS') and a multimedia broadcast multicast service (MBMS: Multimedia Broadcast / Multimedia Service, hereinafter referred to as 'MBMS') to the PSS. Service cell RAS (Radio Access Station), adjacent cell RAS providing an adjacent cell which is an area where the PSS can receive signals adjacent to the service cell, an access control router (ACR) And a method of providing the MBMS to the PSS in a portable Internet (WiBro: Wireless Broadband Internet) system including an IP network, a home network server, and a content providing server providing a broadcast content for providing the MBMS. As (a) requesting the MBMS to the content providing server through the portable Internet system and receiving the MBMS through the service cell RAS; (b) measuring a pilot strength of a signal received from the neighbor cell RAS to determine whether the pilot strength of the neighbor cell RAS is greater than or equal to T_ADD, a handover execution threshold; (c) If it is determined in step (b) that the pilot strength of the neighbor cell is equal to or greater than T_ADD, an MBMS Registration Request (MBMS REG-REQ) message and a PSSHO-REQ (PSSHO-REQ) message are sent to the serving cell RAS. Sending a message; (d) checking, by the serving cell RAS, the received MBMS REG-REQ message and the PSSHO-REQ message to determine whether the adjacent cell is the same soft handover group; (e) if it is determined in step (d) that the neighbor cell is the same soft handover group, the serving cell RAS determines whether the neighbor cell RAS transmits the same MBMS; And (f) if it is determined in step (e) that the neighbor cell RAS transmits the same MBMS, the neighbor cell RAS transmitting broadcast content to the PSS; MBMS providing method using a plurality of radio access stations in a portable Internet network comprising a. The method of claim 1, wherein in step (b) If it is determined that the pilot strength of the neighboring cell RAS is less than or equal to the T_ADD, the step (b) is repeated, and the MBMS providing method using a plurality of radio access stations in the portable Internet network. The method of claim 1, wherein in step (d) If it is determined that the neighboring cell is not the same soft handover group, the method proceeds to the step (b), MBMS providing method using a plurality of radio access stations in a portable Internet network. The method of claim 1, wherein if it is determined in step (e) that the neighbor cell RAS does not transmit the same MBMS, (g) the serving cell RAS requesting the neighbor cell RAS to transmit the same MBMS that the serving cell RAS is transmitting to the neighbor cell RAS to the PSS; MBMS providing method using a plurality of radio access stations in a portable Internet network, characterized in that it further comprises. The method of claim 1, wherein the PSSHO-REQ message is Method for providing MBMS using a plurality of radio access stations in a portable Internet network comprising information on the pilot strength of cells that the PSS can transmit and receive signals among cells around the serving cell where the PSS is located . The method of claim 1, wherein the serving cell RAS is MBMS overhead message including Downlink Channel Description (DCD) message in which Burst Profile characteristic of downlink physical channel is defined and Downlink Map message defining access to downlink information. Method of providing MBMS using a plurality of radio access stations in a portable Internet network, characterized in that transmitting once at least within 1.28 seconds. 7. The method of claim 6, wherein the DL map message is A method of providing MBMS using a plurality of radio access stations in a portable Internet network, further comprising an On / Off field, a Soft Available Indication field, and a Registration Required for Dynamic MBMS field. Multicast service (MBMS: Multimedia Broadcast) to a personal subscriber terminal using a plurality of radio access stations (RAS) in a portable Internet (Portable Internet or WiBro: Wireless Broadband Internet) system / Multimedia Service, hereinafter referred to as 'MBMS') Request the MBMS and measure the strength of pilot signals of signals received from neighboring cells around the serving cell in which the MBMS is located, and if the pilot signal is equal to or larger than T_ADD which is a handover execution threshold, an MBMS Registration Request message. Personal Subscriber (PSS), which generates a Message, hereinafter referred to as an MBMS REG-REQ message, and generates a PSSHO-REQ (PSSHO-REQ) message including information on the pilot strength of the neighbor cells. Station, hereinafter referred to as 'PSS'; A content providing server providing broadcast content according to the MBMS request of the PSS; A service cell RAS which transmits broadcast content received from the content providing server to the PSS located in a service cell which is an area capable of transmitting and receiving data, and receives the MBMS registration request message and the PSSHO-REQ message from the PSS; Adjacent RAS of the serving cell, which forms a neighboring cell capable of providing data transmission / reception services to the PSS and provides the MBMS to the PSS when the PSS is located near the neighboring cell to receive data transmission / reception services. Cell RAS; An access control router (ACR) connected to the serving cell RAS and the neighbor cell RAS based on an IP protocol and controlling the serving cell RAS and the neighbor cell RAS; And An IP network connected to the ACR and the content providing server to relay data transmitted and received between the ACR and the content providing server. MBMS providing system using a plurality of radio access stations in a portable Internet network comprising a. The method of claim 8, wherein the serving cell RAS is Check the MBMS REG-REQ message and the PSHHO-REQ message received from the PSS so that the neighbor cell RAS is the same soft handover group as the serving cell RAS and the neighbor cell RAS is the MBMS provided by the serving cell RAS. If not provided by the neighbor cell RAS, the mobile Internet network, characterized in that for transmitting to the neighbor cell RAS an Elevable Message (Eligible Message) requesting to provide the MBS provided by the serving cell RAS to the PSS MBMS providing system using a plurality of radio access stations. The method of claim 8, wherein the PSS The MBMS providing system using a plurality of radio access stations in the mobile Internet network, characterized in that performing a soft-combining when the MBMS can be provided from the service cell RAS and the neighbor cell RAS. 9. The method of claim 8 wherein the always serving cell RAS is MBMS overhead message including Downlink Channel Description (DCD) message in which Burst Profile characteristic of downlink physical channel is defined and Downlink Map message defining access to downlink information. A system for providing an MBMS using a plurality of radio access stations in a portable internet network, wherein the transmission is performed at least once within at least 1.28 seconds. 12. The method of claim 11, wherein the DL map message is An MBMS providing system using a plurality of radio access stations in a portable Internet network, further comprising an On / Off field, a Soft Available Indication field, and a Registration Required for Dynamic MBMS field. The method of claim 8, wherein the PSSHO-REQ message is MBMS providing system using a plurality of radio access stations in the mobile Internet network, characterized in that it comprises information on the pilot strength of the cells that the PSS can transmit and receive signals among the cells around the service cell where the PSS is located .

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