KR20050007804A - Method and System for Service Mode Decision in Mobile Telecommunication System Capable of Providing Multimedia Broadcast/Multicast Service - Google Patents

Abstract

PURPOSE: A method and a system for determining a service mode in a mobile communication system for providing an MBMS(Multimedia Broadcast/Multicast Service) are provided to calculate a transmission power in consideration of the number of terminals distributed within cells as well as terminal positions, and to determine a proper service mode according to the calculated power, thereby determining a supply mode of an MBMS. CONSTITUTION: More than one MBMS UE(201,203,205,207,209) applies for an MBMS, and receive the applied MBMS through a BCH(Broadcasting Channel). Node B units(211,213,215,217) receive and transmit MBMS request signals from the UEs(201,203,205,207,209), and transmit received MBMS data to each of the UEs(201,203,205,207,209). RNCs(Radio Network Controllers)(221,223) receive and transmit the MBMS request signals, transmit the MBMS data to the node B units(211,213,215,217), and determine an MBMS mode according to positions and the number of the UEs(201,203,205,207,209) on the basis of the node B units(211,213,215,217). An MBMS server(231) receives the MBMS request signals, and forwards the MBMS data to the RNCs(221,223).

Description

Method and system for determining service mode in mobile communication system providing multimedia broadcasting multicast service Capable of Providing Multimedia Broadcast / Multicast Service}

The present invention relates to a method and system for determining a mode of a multimedia broadcasting multicast service in a mobile communication system. More specifically, in order to determine the mode of providing the multimedia broadcasting multicast service in the mobile communication system providing the multimedia broadcasting multicast service, the required transmission power is calculated by considering the number and location of terminals distributed in the cell. And a method and system for determining an appropriate service mode according to the calculated required transmit power.

Recently, due to the development of the mobile communication industry, the services provided by the code division multiple access (CDMA) mobile communication system are not only voice services but also circuit data and packet data. In order to support multimedia multicast communication, the service is being developed from a single data source to a plurality of user terminals (hereinafter referred to as UE) to support multimedia multicast communication. There is a broadcast / multicast service (Broadcast / Multicast Service) that provides. Broadcast / multicast service is a cell broadcast service (CBS), a message-oriented service, and a multimedia broadcast multicast service (MBMS: Multimedia Broadcast / Multicast) that supports multimedia types such as video, still images, voice, and text in real time. Service, hereinafter referred to as 'MBMS'.

Here, MBMS is a broadcast service for simultaneously transmitting data packets to a plurality of subscribers, and aims to transmit multimedia data. Currently, MBMS is in the process of establishing the specification in Release 6.

In addition, there are various types of channels in the CDMA communication system, and there are broadcast channels in which information is broadcasted to a plurality of UEs. Here, the types of broadcast channels include a broadcast channel (BCH) and a forward access channel (FACH), and the broadcast channel is a base station (Node B, hereinafter referred to as 'Node B') for cell access of the UE. It is a channel for broadcasting system information (SI). In addition, the forward access channel is a channel for broadcasting a broadcast message and control information for allocating a dedicated channel in a corresponding UE as well as a similar purpose as a broadcast channel.

As described above, the use of broadcast channels is generally focused on delivering common control information commonly applied to a UE and control information specific to a specific UE, and therefore transmission of user data is extremely difficult. It's limited. In addition, broadcast channels have been recognized as impossible to control the transmission power (Transmission Power) directly connected to the performance of the CMDA mobile communication system due to the nature of transmitting information to a plurality of unspecified UE within the cell radius. Thus, in the MBMS so far, transmission power has been set such that the UE can receive multiple broadcast channels at all points within the cell radius.

FIG. 1 is a diagram briefly showing a transmission power setting for a broadcast channel in a conventional CDMA mobile communication system.

Referring to FIG. 1, the transmission power of the broadcast channels transmitted by the Node B is set to be transmitted to all UEs located within the cell radius of the Node B due to the characteristics of the broadcast channel. Therefore, all UEs located in the Node B can receive the broadcast channel transmitted from the Node B. However, power control performed by Node B in a general wideband-CDMA (W-CDMA) mobile communication system sets a proper transmission power in one-to-one according to a channel situation between a specific UE and Node B. However, unlike the general transmission power control of the Node B, the broadcast channel has a relationship with the Node B and a plurality of unspecified UEs, so that it is virtually impossible to perform transmission power control.

Meanwhile, in the CDMA mobile communication system, the transmission power of Node B is the most important forward transmission resource along with a downlink orthogonal variable spreading factor (OVSF) code resource. Therefore, enabling the unspecified number of UEs to receive the broadcast channel at all points within the Node B cell radius may seriously impair the performance of the CDMA mobile communication system. Therefore, in the CDMA mobile communication system, the use of broadcast channels is minimized as much as possible.

On the other hand, although MBMS is a service provided through a broadcast channel, it requires a large amount of transmission resources, the need for control of its transmission power in the aspect that a large number of services can be deployed simultaneously in a Node B, have. In order to solve this requirement, MBMS selectively uses one-to-one (PtP: Point to Multipoint) mode and one-to-many (PtM: Point to Multipoint (PtM)) mode. Providing.

PtP mode is a mode in which Node B provides one-to-one broadcasting service to one UE in a cell through one dedicated channel, and in PtM mode, Node B establishes a shared channel for a plurality of unspecified UEs in a cell. This mode provides a one-to-many broadcasting service. However, when providing an MBMS service using a shared channel, a method of selecting an appropriate MBMS mode is very important because one shared channel uses about 30% of communication resources of a cell.

That is, it is preferable to provide a broadcast service in PtM mode when the number of UEs located in one cell is large. However, when a small number of UEs are located in one cell, a broadcast service may be provided by providing a broadcast service in PtP mode. It would be desirable to use it efficiently. Therefore, it will be important to know the number of UEs located in each cell for each cell.

However, the method of determining the MBMS service mode using only the number of UEs located in one cell overlooks the fact that the required transmit power value of Node B varies from time to time according to the location of UEs in a cell in a CDMA mobile communication system. There is this. That is, even if there is the same number of UEs in one cell, the transmission power value to be output from the Node B varies depending on whether the UE is concentrated near the center of the cell or near the boundary.

For example, even if the same number of UEs are concentrated near the center of the cell, the transmission power at the Node B is small, so that the service can be provided one-to-one with the UE within the margin of the transmission power. However, even when the same number of UEs are concentrated near the cell boundary, the transmission power at the Node B is increased, so that it is more efficient in terms of power control to provide services at the same time by using a shared channel.

In summary, there is a demand for a method of determining the MBMS mode in consideration of the location of a UE, rather than using only the number of UEs located in a cell.

In order to solve the above problems, in order to determine the mode of providing the multimedia broadcasting multicast service in the mobile communication system providing the multimedia broadcasting multicast service, the required transmission power is calculated in consideration of the number and location of terminals distributed in the cell. And a method and system for determining an appropriate service mode according to the calculated required transmission power.

1 is a diagram briefly showing a transmission power setting for a broadcast channel in a conventional CDMA mobile communication system;

2 is a block diagram schematically illustrating a CDMA mobile communication system for providing an MBMS service according to an embodiment of the present invention;

FIG. 3 illustrates a CDMA mobile communication system for MBMS described in detail with reference to FIG. 2; FIG.

4 is an exemplary screen for determining positions of MBMS-UEs distributed in a cell by using a Target SIR value according to an embodiment of the present invention;

5 is a diagram illustrating an MBMS service mode determination table for determining an MBMS service mode in consideration of the number and location of MBMS-UEs in a cell according to an embodiment of the present invention;

6 is a flowchart illustrating a process of determining an MBMS service mode in an MBMS service mobile communication system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

201 ~ 209: User terminal (UE) 211 ~ 217: Node B

221, 223, 350: Radio Network Controller (RNC)

231: Multimedia broadcasting multicast service (MBMS) server

310: multicast / broadcasting service center (MB-SC) 320: transmission network

330: gateway packet wireless service support node (GGSN)

340: Service Packet Wireless Service Support Node (SGSN)

360: Node B cell 1 370: Node B cell 2

To this end, the present invention is a system for determining the MBMS service mode in a mobile communication system for providing a multimedia broadcast multicast service, located in an arbitrary cell, the MBMS service is applied for one or more receiving the MBMS service through a broadcast channel MBMS user terminal; A Node B for receiving and transmitting an MBMS service request signal from each of the MBMS user terminals and transmitting the received MBMS data to each of the MBMS user terminals; A wireless network that receives and transmits the MBMS service request signal and transmits the received MBMS data to the Node B, wherein the MBMS service mode is determined based on the location and number of each MBMS user terminal based on the Node B. Controller; And an MBMS server for receiving the MBMS service request signal from the wireless network controller and transmitting the requested MBMS data to the wireless network controller. Provides a system for determining service modes.

According to another object of the present invention, at least one MBMS user terminal using an MBMS service, a Node-B for managing each MBMS user terminal in units of cells, an MBMS server for transmitting the MBMS data and the MBMS data by receiving the A method of determining an MBMS service mode in order to provide a multimedia broadcasting multicast service in a mobile communication system composed of a wireless network controller transmitting to a Node-B, the method comprising: (a) receiving an MBMS service request signal transmitted from each MBMS user terminal; Receiving; (b) identifying the MBMS user terminal using the received MBMS service request signal; (c) identifying a distribution position of each MBMS user terminal and identifying the number of MBMS user terminals in the identified distribution position; (d) calculating a power value for mode determination according to the distribution position and the number; (e) comparing the mode determination power value with the one-to-one mode power value and / or the one-to-many mode power value preset in the corresponding cell; And (f) determining the MBMS service mode according to the comparison result in the step (e) of determining the MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service. to provide.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, 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.

2 is a block diagram schematically illustrating a CDMA mobile communication system for providing an MBMS according to a preferred embodiment of the present invention.

CDMA mobile communication system for providing an MBMS according to a preferred embodiment of the present invention is a plurality of UE (201, 203, 205, 207, 209), Node B (211, 213, 215, 217), wireless network controller 221 223, MBMS server 231, and the like.

The UEs 201, 203, 205, 207, and 209 are mobile communication terminals capable of using MBMS. Some UEs 201 and 203 are connected to the Node B 211, and some UEs 205, 207, 209 is connected to Node B 215. Here, the UEs 201, 203, 205, 207, and 209 receive the MBMS from the MBMS server 231 which will be described later through a dedicated channel in the PtP mode or a shared channel in the PtM mode.

UE 201, 203, 205, 207, 209 according to an embodiment of the present invention is a personal digital assistant (PDA), cellular phone, personal communication service (PCS) phone, hand-held PC (PC), GSM ( Global System for Mobile (WD) phones, Wideband CDMA (W-CDMA) phones, CDMA-2000 phones, Mobile Broadband System (MBS) phones, and the like. Here, MBS phone refers to a mobile phone to be used in the fourth generation system currently being discussed.

Node B (211, 213, 215, 217) receives the MBMS data from the MBMS server 231, and transmits the MBMS data to each cell area in which it has jurisdiction over a predetermined broadcast channel for transmitting the received MBMS data. Broadcast.

Radio network controllers (RNCs) (221, 223) are generally wired / wireless channel management, protocol matching processing of a terminal and a wireless base station, soft handoff processing, and GPRS (General). Performs functions such as Packet Radio Service connection, system loading, and fault management. Here, GPRS is a communication method for enabling a packet switching communication implementation in a GSM communication network.

Meanwhile, according to the exemplary embodiment of the present invention, the RNCs 221 and 223 transmit the MBMS data received from the MBMS server 231 to the Node Bs 211, 213, 215, and 217 connected thereto. For example, referring to FIG. 2, Node Bs connected to the RNC 221 are Node B 211 and Node B 213, and only Node B 221 is connected to the UEs 201 and 203 to perform MBMS. However, if another Node B 213 is also connected to the UEs 201 and 203 that want to receive the MBMS, the RNC 221 transfers the MBMS data received from the MBMS server 231 to the Node B 211 and the Node B 213. Will transmit each.

On the other hand, the determination of the MBMS mode according to an embodiment of the present invention is determined by the RNC (221, 223). That is, the RNCs 221 and 223 set a target signal-to-interference ratio (hereinafter, referred to as 'target SIR') to set the position of the UE requesting the MBMS in the downlink outer loop power control. Target SIR '), which is described in more detail below with reference to FIG. 3.

The MBMS server 231 receives an MBMS request from a plurality of UEs 201, 203, 205, 207, and 209 and provides a corresponding MBMS.

FIG. 3 is a diagram more specifically illustrating a CDMA mobile communication system for the MBMS described with reference to FIG. 2.

CDMA mobile communication system for MBMS according to an embodiment of the present invention is a multicast / broadcasting-service center 310, transmission network 320, gateway packet radio service support node 330, service packet radio service support node 340 , RNC 350, Node Bs 360, 370, and the like.

The Multicast / Broadcast-Service Center (MB-SC) hereinafter referred to as MB-SC (310) provides an MBMS data stream to the UE and provides a stream for the MBMS service. Scheduling is delivered to the transmission network 320.

A gateway packet wireless service support node (GGSN: hereinafter referred to as a 'GGSN') 330 is a serving node of an IP (Internet Protocol) based packet network that provides a high speed packet data service for GPRS data service. Node), it provides mobility of a packet data service and performs various data related protocol processing functions and is connected to a packet data network. In addition, the GGSN 330 provides address assignment, domain address change, billing information, and maintenance functions.

The service packet wireless service support node (SGSN: Serving GPRS Support Node (hereinafter referred to as 'SGSN') 340 has a hardware structure that provides an ATM (Asynchronous Transfer Mode) based switch and routing connection for GPRS services. Supports operating system (OS) based on data service processing. The operating system's functions consist of GPRS mobility management, GPRS session management, GPRS authentication, and billing functions.

Meanwhile, the SGSN 340 selectively transmits the MBMS data stream received from the MB-SC 310 through the transmission network 320 and the GGSN 330 to the RNC 350 managing UEs to receive MBMS service. . In addition, the SGSN 340 processes the authentication of UEs requesting the MBMS service and checks whether the service is subscribed and the type of the subscribed service. Although not shown in FIG. 3, the SGSN 340 may interwork with a Home Location Register (HLR) for subscriber authentication of the MBMS service.

The RNC 350 controls a plurality of Node Bs, transmits Node B data to a Node B in which a UE requesting MBMS service among Node Bs managed by the RNC 350 exists, and is configured to provide MBMS service. Control the channel (Radio Channel).

Meanwhile, a method of determining the location of UEs in a cell according to an embodiment of the present invention will be described below.

UEs wishing to receive MBMS services in the MBMS perform a process of selecting an arbitrary cell, that is, an arbitrary Node B, providing the MBMS service (Cell Selection). In this case, the cell selection means that the UE receives a first common pilot channel (PCPICH) signal of the cell to perform frame synchronization and cell synchronization. In addition, the method includes receiving system information (SI) transmitted through a broadcast channel to obtain information for accessing the system. The system information includes, for example, code information and random access information of a random access channel (RACH) through which any UE can transmit a message to the system.

After completing the selection of a specific cell, UEs transmit an MBMS request message to the RNC through the Node B to which they belong. Receiving a plurality of MBMS request messages, the RNC needs to determine the transmission power to provide MBMS service. The RNC determines the number and location of UEs in units of cells managed by the RNC.

According to the present invention, the location of UEs in a cell is determined to be one of near, middle and far distances in a predetermined distance unit based on Node B located in the center of the cell. In each cell, the RNC sets Target SIR value in forward outer loop power control to determine whether the UE requesting MBMS service (hereinafter referred to as MBMS-UE) is near, intermediate, or remote. Use

Here, forward outer loop power control is a kind of forward power control performed in a CDMA mobile communication system. In general, forward power control is classified into fast forward power control and outer loop power control. Fast forward power control is a method of adjusting a forward transmit power value according to a power control bit (PCB: hereinafter called 'PCB') transmitted by the UE in units of 1.25 ms. The UE compares the received power value with the threshold for power control and sends a signal to increase the transmit power (PCB = 0) when the received power value is less than the threshold value, and transmit power when the received power value is greater than the threshold value. Send a signal to lower (PCB = 1).

Outer loop power control is based on the frame error rate (FER), which is set in the comparison between the received power value and the threshold value performed by the UE in the forward power control, and the threshold value is dynamically set. To adjust dynamically. Here, the received power value used by the RNC is determined according to a Target SIR value set for each UE in consideration of the FER value set for each UE. Therefore, in the embodiment of the present invention, it is determined based on the Target SIR value set for each MBMS-UE.

On the other hand, there are a number of algorithms for determining the target SIR value for each terminal in the forward outer loop power control of the CDMA mobile communication system, and the algorithm for determining the target SIR value is also known to those skilled in the art, detailed description thereof will be omitted. do. However, the algorithm for determining the Target SIR value used in the MBMS according to the embodiment of the present invention may include not only a plurality of algorithms proposed to date, but also algorithms to be proposed in the future.

A method of determining the location of an MBMS-UE in a cell by using a Target SIR value set for each MBMS-UE will be described in more detail with reference to FIG. 4.

4 is an exemplary screen for determining positions of MBMS-UEs distributed in a cell by using a Target SIR value according to an embodiment of the present invention.

As can be seen from Figure 4, the location of the UE in the cell according to an embodiment of the present invention is classified into a short distance, a middle distance and a long distance based on the Node B (400) which is the center of the cell. The distance value to each boundary region in the Node B 400, which is the center of the cell distinguishing the short distance, the middle distance, and the long distance, may be arbitrarily set. However, it would be desirable to have closed loops connecting the near, intermediate, and remote boundary points to be of the same shape but with different sizes. For example, in consideration of the fact that the cell structure is hexagonal to increase the frequency reuse rate in a mobile communication system, it is preferable that the boundary points of the near, intermediate, and far distances are set such that the shape of the closed loop is also the hexagon of the same shape. something to do. Meanwhile, in FIG. 4, for convenience of description, an elliptical cell instead of a hexagonal shape is assumed.

Meanwhile, as shown in FIG. 4, when the regions constituting the short distance, the intermediate distance, and the long distance are determined in the cell, the RNC determines the position of the UE by comparing the target SIR value set for each MBMS-UE with the limit power value set for each boundary region.

In more detail, the threshold power values are set at the boundary lines of the near and the intermediate distance regions shown in FIG. 4. Here, the limit power value is an average value of power consumption values required by the RNCs of UEs located at the boundary line. Since the farther the UE is located from the RNC, the higher power consumption is required, so the power consumption values at each boundary are the maximum power consumption values that can be required in all directions in the region. Here, the limit power value is set only in the near area and the intermediate distance area. The setting of the limit power values in the short range region and the intermediate distance region may be set in advance by measuring power consumption power values required by the test terminal using the test terminal at a plurality of boundary points of each region.

Accordingly, the RNC receiving MBMS service from a plurality of MBMS-UEs checks a target SIR value set for each MBMS-UE, and sets a limit power value (hereinafter, referred to as a "near-range limit value") and / or an intermediate distance set in the near area. The location of the UE is determined by performing a comparison with the limit power value (hereinafter, referred to as 'middle distance limit value') set in the region.

In addition, in the forward outer loop power control, a target SIR value is reset every 20 ms frame in order to efficiently perform power control according to the propagation environment of the data or signal and the change of the position of the mobile terminal. Therefore, the location of the UE in the MBMS service according to the embodiment of the present invention will be re-identified in units of 20 ms frame.

In more detail, the RNC checks the Target SIR value set in the MBMS-UE by using the Mobile Identification Number (MIN) or the Electrical Serial Number (ESN) of the MBMS-UE requesting the MBMS service. Then, the RNC first performs a first positioning operation that compares the identified Target SIR value with the magnitude of the near limit value. If the RNC determines that the target SIR value is smaller than the near limit value, as a result of the comparison of the first positioning operation, the RNC sets the location of the UE to the near field.

On the other hand, if it is determined that the target SIR value is greater than the near limit value as a result of the comparison of the first location operation, the second location operation is performed to compare the size of the target SIR value and the intermediate distance limit value. If the RNC determines that the Target SIR value is smaller than the intermediate distance limit as a result of the comparison of the second location determination operation, the RNC sets the intermediate distance of the location of the UE. On the other hand, if it is determined that the target SIR value is larger than the intermediate distance limit as a result of the comparison of the second location, the location of the corresponding UE is set far.

Of course, according to the embodiment of the present invention, the location of the MBMS-UE is divided into three stages of short distance, intermediate distance, and long distance, but in order to perform more efficient power control, it may be divided into four or five steps.

5 is a diagram illustrating an MBMS service mode determination table for determining an MBMS service mode in consideration of the number and location of MBMS-UEs in a cell according to an embodiment of the present invention.

Referring to the MBMS service mode decision table shown in FIG. 5, it can be seen that required transmission power according to the location and number of MBMS-UEs is indicated. In the MBMS service mode decision table, 'N' is an MBMS service mode decision variable determined by a mobile communication operator operating an MBMS service mobile communication network in consideration of the size of a cell controlled by a base station and the number of subscribers of an MBMS service.

Referring to the MBMS service mode determination table of FIG. 5, when the MBMS-UE is located at a short distance and the number of MBMS-UEs located at a short distance corresponds to 'N + 1', a transmission power value required by the Node B as a base station Is 25. Of course, the transmit power value shown in FIG. 5 is a relative value based on 100. Hereinafter, a process of determining a power value for mode determination using the MBMS service mode determination table of FIG. 5 will be described as an example.

The RNC of the MBMS service mobile communication system determines which area of the short-range, middle-distance and long-distance is located for each MBMS-UE distributed in a specific cell. Then, find out the number of MBMS-UEs distributed in each area. For example, suppose there are 10 MBMS-UEs in a particular cell. As a result of RNC's identification and distribution of 10 MBMS-UEs, it was found that there are 4 units at close range, 3 units at intermediate distance, and 3 units at far distance.

In addition, assuming that the MBMS service mode decision variable N = 2 preset in the corresponding cell, the number of MBMS-UEs distributed in the short range is 'N + 2', and the number of MBMS-UEs distributed in the middle and far distances is Will be 'N + 1'. In addition, the required transmit power values for the MBMS-UE distributed for each region are short distance = 30, intermediate distance = 35, and long distance 45. Therefore, the total transmit power value required by the Node B managing the cell will be 30 + 35 + 45 = 110. Here, 110, which is the sum of the required transmission power values required for the short range, the intermediate distance, and the remote area, becomes the power value for mode determination according to the embodiment of the present invention.

Of course, the MBMS service mode determination table according to the embodiment of the present invention is not limited to the value illustrated in FIG. 5, and may be modified as much as the size of the cell, the number of subscribers of the MBMS service, and the like.

The RNC determines the MBMS service mode by comparing the calculated mode determination power value with the PtP mode power value and / or the PtP mode power value calculated through the above-described process. Here, the PtP mode power value and the PtM mode power value are power values that are used to determine whether to provide MBMS service in PtP mode or MBMS service in PtM mode in the MBMS service providing area of a cell unit.

That is, when the above-described mode determination power value is smaller than the PtP mode power value, the corresponding cell provides the MBMS service in the PtP mode. On the other hand, if the power value for mode determination is greater than the PtM mode power value, MBMS service is provided in PtM mode. That is, the PtP mode power value according to the embodiment of the present invention is the maximum power value for providing the MBMS service in the PtP mode, and the PtM mode power value is the minimum power value for providing the MBMS service in the PtM mode.

Meanwhile, the PtP mode power value and the PtM mode power value may be set differently according to the MBMS service mode determination table used for each cell unit that provides the MBMS service. To this end, the RNC managing a plurality of Node Bs in the MBMS service mobile communication system has an MBMS service mode decision table, a PtP mode power value, and a PtM mode power value for each Node B. In addition, in order to determine an appropriate MBMS service mode in consideration of the mobility of the MBMS-UE, the RNC may repeatedly perform the MBMS service mode determination operation described above every predetermined period.

6 is a flowchart illustrating a process of determining an MBMS service mode in an MBMS service mobile communication system according to an embodiment of the present invention.

If the MBN service request signal is transmitted by at least one MBMS-UE distributed in a specific cell, the RNC receives the MBMS service request signal through the Node B (S600). Of course, in order to provide the MBMS service, the MBMS service should be activated in the MBMS service mobile communication system. The RNC transmits the received MBMS service request signal to the MBMS server through the transmission network (S602).

The RNC of the MBMS service mobile communication system in which the MBMS service is activated determines the location of the MBMS-UE distributed in a specific cell and the number of MBMS-UEs per location (S604). The RNC calculates a mode determination power value by using the location and number of MBMS-UEs determined in step S604 and the MBMS service mode decision table used in the corresponding cell (S606).

The RNC compares the PtP mode power value preset in the cell with the mode determination power value calculated in step S606 to determine whether the mode determination power value is small (S608). If it is determined in step S608 that the mode determination power value is smaller than the PtP mode power value, the RNC determines that the MBMS service mode for the corresponding cell is the PtP mode (S610).

Otherwise, if the determination result of step S608 determines that the PtP mode power value is greater than the mode determination power value, the RNC determines whether the mode determination power value is greater than the PtM mode power value preset in the corresponding cell (S612). If it is determined in step S612 that the mode determination power value is greater than the PtM mode power value, the RNC determines that the MBMS service mode for the corresponding cell is the PtM mode (S614).

Otherwise, if the determination result of the step S612 determines that the mode determination power value is smaller than the PtM mode power value, the RNC arbitrarily selects one of the PtP mode and the PtM mode (S616). The RNC provides the requested MBMS service to the MBMS-UE according to the MBMS service mode selected in step S610, step S614 or step S616 (S618).

The above description is merely illustrative of the present invention, and those skilled in the art to which the present invention pertains may various modifications without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. It is intended that the scope of the invention be interpreted by the following claims, and that all descriptions within the scope equivalent thereto shall be construed as being included in the scope of the present invention.

As described above, in the conventional mobile communication system for MBMS service, there is a disadvantage in that an appropriate mode decision is not made because the MBMS mode is determined in consideration of only the number of MBMS-UEs located in a cell. However, according to the embodiment of the present invention, the transmission power at the base station can be calculated in consideration of the location factor of the MBMS-UE located in the cell, so that an appropriate MBMS mode can be selected.

In addition, by periodically grasping the positions of the MBMS-UEs distributed in the cell and the number of MBMS-UEs according to the distribution position, an appropriate MBMS mode can be actively selected so that communication resources such as transmission power can be more efficiently managed and used. There is an advantage.

Claims (25)

A system for determining an MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service (MBMS), At least one MBMS user terminal (MBMS-UE) located in an arbitrary cell and receiving the MBMS service through a broadcasting channel (BCH) by applying for an MBMS service; A Node B for receiving and transmitting an MBMS service request signal from each of the MBMS user terminals and transmitting the received MBMS data to each of the MBMS user terminals; A wireless network that receives and transmits the MBMS service request signal and transmits the received MBMS data to the Node B, wherein the MBMS service mode is determined based on the location and number of each MBMS user terminal based on the Node B. Controller (RNC); And An MBMS server receiving the MBMS service request signal from the wireless network controller and transmitting the requested MBMS data to the wireless network controller System for determining the MBMS service mode in a mobile communication system for providing a multimedia broadcast multicast service comprising a. The method of claim 1, The wireless network controller determines the location of each MBMS user terminal by using a target signal-to-interference ratio (Target SIR) value set for each MBMS user terminal in downlink outer loop power control. A system for determining an MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service. The method of claim 1, MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, wherein the location of each MBMS user terminal is set to one of a near area, a medium area, and a far area. System to determine. The method according to claim 1 or 3, The wireless network controller determines the MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, characterized in that the number of MBMS user terminals is determined for each of the short range area, the intermediate distance area, and the far area. The method of claim 1, The wireless network controller maintains an MBMS service mode decision table for determining the MBMS service mode for each of the one or more Node Bs under its control. System to determine. The method according to claim 3 or 5, In the MBMS service mode determination table, a transmission power value required by Node B is recorded according to the number of MBMS user terminals distributed in each of the short range region, the intermediate distance region and the far region. A system for determining an MBMS service mode in a mobile communication system providing a service. The method of claim 6, The number of MBMS user terminals is represented using a MBMS service mode decision variable determined according to the size of a cell managed by Node B and the number of subscribers of MBMS services. The system that determines the MBMS service mode in the system. The method of claim 5, wherein The wireless network controller determines a MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, wherein the power value for mode determination is calculated and stored for each cell using the MBMS service mode determination table. system. The method of claim 8, The mode determination power value is calculated by adding the required transmission power value recorded in the MBMS service mode determination table according to the distribution position of the MBMS user terminal and the number of MBMS user terminals according to the distribution position. A system for determining an MBMS service mode in a mobile communication system providing a broadcast multicast service. The method of claim 1, The wireless network controller determines the MBMS service mode in the mobile communication system providing the multimedia broadcasting multicast service, wherein the wireless network controller stores one to one (PtP) mode power value and one to many (PtM) mode power value for each cell. System. The method of claim 10, The one-to-one mode power value is the maximum transmit power value for providing MBMS service in one-to-one mode, and the one-to-many mode power value is the minimum transmit power value for providing the MBMS service in one-to-many mode. A system for determining MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service. The method of claim 10, The one-to-one mode power value and the one-to-many mode power value are set for each cell in consideration of the size of the cell and the number of MBMS user terminals distributed in the cell. A system that determines the MBMS service mode in a communication system. The method of claim 1, The MBMS server schedules the MBMS data and transmits the MBMS data to each MBMS user terminal through a transmission network in a stream format to the respective MBMS user terminals (MB-SC: Multicast / Broadcast-Service Center). The system for determining the MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service. The method of claim 13, A service packet for transmitting an MBMS data stream received from the multicast / broadcasting service center and the MBMS service request signal received from the wireless network controller between the multicast / broadcasting-service center and the radio network controller. A system for determining MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, characterized in that a wireless service support node (SGSN) is installed. The method of claim 14, The service packet radio service support node provides a function of processing an authentication of each MBMS user terminal and checking whether a MBMS service is subscribed and a type of a subscribed MBMS service. A system for determining MBMS service mode in a mobile communication system. The method of claim 14, Gateway packet radio service support for providing mobility of the MBMS user terminals in the MBMS service between the multicast / broadcasting-service center and the service packet radio service support node and performing a protocol processing function in the MBMS service. A system for determining MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, characterized in that a node (GGSN) is installed. The method of claim 1, The MBMS user terminal is a PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, Hand-Held PC (GSM), Global System for Mobile (GSM) phone, Wideband CDMA (W-CDMA) phone A system for determining MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, characterized in that at least one of a CDMA-2000 phone and a Mobile Broadband System (MBS) phone. At least one MBMS user terminal using an MBMS service, a Node-B managing each MBMS user terminal on a cell basis, an MBMS server for transmitting the MBMS data, and a wireless network for receiving and transmitting the MBMS data to the Node-B. A method of determining an MBMS service mode for providing a multimedia broadcasting multicast service in a mobile communication system comprising a controller, (a) receiving an MBMS service request signal transmitted from each said MBMS user terminal; (b) identifying the MBMS user terminal using the received MBMS service request signal; (c) identifying a distribution position of each MBMS user terminal and identifying the number of MBMS user terminals in the identified distribution position; (d) calculating a power value for mode determination according to the distribution position and the number; (e) comparing the mode determination power value with the one-to-one mode power value and / or the one-to-many mode power value preset in the corresponding cell; And (f) determining the MBMS service mode according to the comparison result in step (e) Method for determining the MBMS service mode in a mobile communication system for providing a multimedia broadcast multicast service comprising a. The method of claim 18, wherein in step (c), The wireless network controller determines a location of each MBMS user terminal by comparing a target signal-to-interference ratio value set for each MBMS user terminal and comparing it with one or more threshold values stored therein. How to determine the MBMS service mode in a mobile communication system providing a. The method of claim 19, The wireless network controller checks the target signal-to-interference ratio value set for each MBMS user terminal using a mobile identification number (MIN) or an electrical serial number (ESN) of the MBMS user terminal included in an MBMS service request signal. Method for determining the MBMS service mode in a mobile communication system providing a multimedia broadcasting multicast service, characterized in that. The method of claim 18, wherein in step (c), The distribution location is set to one of three areas, i.e., a short range area, a middle range area, and a far area around the Node-B, and the MBMS service mode is determined in the mobile communication system providing the multimedia broadcasting multicast service. . The method of claim 18, wherein in step (e), If it is determined that the mode determination power value is smaller than the one-to-one mode power value, the wireless network controller sets the MBMS service mode to the one-to-one mode, and the MBMS service in the mobile communication system providing the multimedia broadcasting multicast service. How to determine the mode. The method of claim 18, wherein in step (e), If it is determined that the mode determination power value is greater than the one-to-one mode power value, the wireless network controller compares the mode determination power value and the one-to-many mode power value. Method for determining MBMS service mode in a mobile communication system providing a service. The method of claim 23, If it is determined that the mode determination power value is greater than the one-to-many mode power value, the wireless network controller sets the MBMS service mode to a one-to-one mode. How to determine the service mode. The method of claim 24, If it is determined that the mode determination power value is less than the one-to-many mode power value, the wireless network controller selects and sets the MBMS service mode by selecting one of one-to-one mode and one-to-many mode. Method for determining MBMS service mode in a mobile communication system providing a cast service.