KR20040040280A - Paging method in mobile communication system serving multimedia broadcast/multicast service and method thereof - Google Patents

Abstract

PURPOSE: A paging method in a mobile communication system providing a multicast multimedia broadcast service is provided to effectively perform a paging on multiple UEs by transmitting PCH(Paging CHannel)-related information through a non-use region of a general PICH and variably setting and transmitting a transmission period and transmission point of the PCH. CONSTITUTION: An RNC(Radio Network Controller) checks whether a PCH transmission period PAGING_INTERVAL and offset information OFFSET for an MBMS service have been received from an SGSN(Serving GPRS Support Node)(701). If the PCH transmission interval and the offset information have been received, the RNC transmits the PCH transmission interval, the offset information and a TMGI(Temporary Multicast Group Identity) to a corresponding UE(703). The RNC sets an MBMS indication as 1 in a data frame structure of a lub frame protocol, sets an MBMS PI bit map and a PICH(Paging Indicator CHannel) duration, and transmits them to a base station(704). The RNC transmits a paging type 1 message to the base station so as for the UE to receive a PCH(705). The RNC checks whether the paging type 1 message has been transmitted the m number of times(706).

Description

PAGING METHOD IN MOBILE COMMUNICATION SYSTEM SERVING MULTIMEDIA BROADCAST / MULTICAST SERVICE AND METHOD THEREOF}

The present invention relates to a mobile communication system, and more particularly, to a calling method for a multicast multimedia broadcasting service.

Today, due to the development of the telecommunications industry, the services provided by the code division multiple access (CDMA) mobile communication system are not only voice services but also large capacity such as packet data and circuit data. It is evolving into a multicasting multimedia communication that transmits data. Accordingly, in order to support the multicasting multimedia communication, a broadcast / multicast service that provides a service from one data source to a plurality of user equipments (hereinafter referred to as UE) is provided. There is. The broadcast / multicast service is a cell broadcast service (hereinafter, referred to as a "CBS service"), a message-oriented service, and a multicast multimedia broadcast service supporting multimedia forms such as real-time video, voice, still image, and text ( MBMS: Multimedia Broadcast / Multicast Service, hereinafter referred to as "MBMS".

Next, a network structure for providing the MBMS service in the mobile communication system will be described with reference to FIG. 1.

1 is a diagram schematically illustrating a network structure for providing an MBMS service in a mobile communication system.

Referring to FIG. 1, first, a multicast / broadcast service center (BM-SC) (hereinafter, referred to as a "BM-SC") 110 provides an MBMS stream. As a source, the BM-SC 110 schedules a stream for an MBMS service and transmits the stream to a transmission network 111. The transport network 111 refers to a network existing between the BM-SC 110 and a service packet radio service support node (SGSN) 100. And, the stream for the MBMS service received from the BM-SC (110) delivers to the SGSN (100). Here, the SGSN 100 belongs to a core network (CN: hereinafter referred to as "CN"), serves as a connection between the UTRAN and the CN, and a plurality of users who want to receive the MBMS service at any point in time. UEs, for example, UE1 104, UE2 105, UE3 106 belonging to Node B 1 102, and UE4 107, UE5 108 belonging to Node B2 103 exist. Let's assume. The SGSN 100 receiving the stream for the MBMS service in the transmission network 111 controls the MBMS-related services of subscribers, ie, UEs, that want to receive the MBMS service. And control MBMS related services such as selectively transmitting MBMS service data to a specific Radio Network Controller (RNC) 101. In addition, the SGSN 100 configures and manages an SGSN SERVICE CONTEXT for the MBMS service X, and transfers the stream for the MBMS service to the RNC 101 again. Herein, a service context for an MBMS service will be referred to as an MBMS service context, and the MBMS service context means a set of control information necessary for providing an arbitrary MBMS service. The RNC 101 controls a plurality of Node Bs, transmits MBMS service data to a Node B in which a UE requesting MBMS service among Node Bs managed by the RNC 101 exists, and also provides the MBMS service. The RNC service context is configured and managed with respect to the MBMS service X by controlling a radio channel to be set and having a stream for the MBMS service received from the SGSN 100. As shown in FIG. 1, an MBMS service is provided between a Node B 102, for example, a Node B 102 and UEs 104, 105, and 106 belonging to the Node B 102. Only one radio channel is configured for this purpose. Although not shown in FIG. 1, a Home Location Register (HLR) is connected to the SGSN 100 to perform subscriber authentication for an MBMS service.

In addition, as described above, the RNC 101 and the SGSN 100 manage service related information for each MBMS service, and define related information managed for each MBMS service as the MBMS service context. Here, the information stored in the MBMS service context includes, for example, a list of UEs that want to receive MBMS service, that is, a UE identifier of UEs that want to receive MBMS service, and a service area in which the UEs are located. area) and information such as quality of service (QoS) required for providing the MBMS service.

Then, considering the process of providing any MBMS service here.

In order to provide any MBMS service, basic information about the MBMS service must first be delivered to UEs, and when UEs receiving basic information about the MBMS service want to receive the arbitrary MBMS service, the list of UEs is provided. It must be delivered to this network. When receiving a list of UEs that wish to receive the MBMS service in the network, the network should set up a radio bearer for providing the MBMS service by paging the UEs. After the radio bearer is established with the UEs, the MBMS service is provided through the radio bearer. On the other hand, when the MBMS service is terminated, it must be notified to all UEs, and thus, all UEs must release all resources allocated for the MBMS service so that normal MBMS service can be performed. .

In order to provide the MBMS service, a plurality of control messages must be transmitted and received between the network and the UEs, and the network must call the UEs to transmit and receive the control messages. However, there is a need for a calling procedure for the MBMS service because no paging process is currently defined in providing the MBMS service.

Accordingly, an object of the present invention is to provide a method of calling a mobile communication system that provides an MBMS service.

Call information transmission method of the present invention for achieving the above object; A first call indication information area indicating that there is a call related to the first service to provide a first service, a second service different from the first service, and a second indicating that there is a call related to the second service A method for transmitting call information related to the second service in a mobile communication system transmitting a call indication channel signal including a call indication information area, the method comprising: transmitting a transmission cycle for transmitting the second service call information and a transmission start position thereof; Transmitting offset information for a period, and repeatedly transmitting the second service call information a predetermined number of times at a transmission start position determined according to the offset information.

Another call information transmission method of the present invention for achieving the above object; A first call indication information area indicating that there is a call related to the first service to provide a first service, a second service different from the first service, and a second indicating that there is a call related to the second service A method of transmitting call information related to the second service in a mobile communication system that transmits a call indication channel signal including a call indication information area, the service packet wireless service being supported when a second service reception request is detected from a user terminal Transmitting, by a Serving GPRS Support Node (SGSN), offset information for indicating a transmission period for transmitting call information related to the second service and a transmission start position thereof to a radio network controller (RNC); The RNC transmitting a call indication channel signal including the second call indication information area; RNC is characterized in that it comprises the step of repeating transmission as in one after the offset is determined in correspondence to the information transmission starting point transmits the paging indicator channel signal a preset number of times for the second service paging information.

Call information receiving method of the present invention for achieving the above object; A call indication information area including a first service indication information indicating that there is a call related to the first service to provide a second service different from the first service, and a call related to the second service. A method for receiving call information related to the second service in a mobile communication system that receives a call indication channel signal having a second call indication information area including second call indication information indicating that a message is present, the second service. Receiving offset information indicating a reception period for receiving call information and a reception start position thereof, receiving the call indication channel signal at a preset time point, and detecting the second call indication information from the call indication channel signal And the second call indication information indicates that there is call information of the second service. And it characterized in that it comprises the step that corresponds to the offset information, receiving the second service paging information.

1 schematically illustrates a network structure for providing an MBMS service in a mobile communication system;

2 is a signal flow diagram illustrating a control message transmission and reception process when the SGSN determines the PCH transmission period PAGING_INTERVAL and offset information OFFSET according to an embodiment of the present invention.

3 is a signal flow diagram illustrating a control message transmission and reception process when the RNC determines the PCH transmission period PAGING_INTERVAL and offset information OFFSET according to another embodiment of the present invention.

4 schematically illustrates a data frame structure of an Iub frame protocol according to an embodiment of the present invention.

5 is a diagram schematically illustrating a PICH and PCH reception timing of a UE according to an embodiment of the present invention.

6 is a flowchart illustrating a UE operation process according to an embodiment of the present invention.

7 is a flowchart illustrating an RNC operation process according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In the present invention, a mobile communication system that provides a multicast multimedia broadcasting service (MBMS: Multimedia Broadcast / Multicast Service (hereinafter referred to as " MBMS ")) may be a user equipment (Network), that is, a UTRAN (UMTS Terrestrial Radio Access Network). In the following description, a call method for minimizing power consumption of a UE (hereinafter referred to as UE) is proposed. In addition, the calling method proposed in the present invention can be applied to either the IDLE state, the CELL_PCH state, or the URA_PCH state. Here, the state of the UE is as follows.

(1) CELL_PCH state: The UE in the CELL_PCH state monitors a paging indicator channel (PICH: PICH), and is referred to as a forward access channel (FACH). Other channels such as) are not received. Before a radio network controller (RNC: Radio Network Controller, hereinafter referred to as "RNC") transmits data to the UE, it must call the UE and transition to the CELL_FACH state. Similarly, the UE transmits data to the RNC. It must transition to CELL_FACH state before. The RNC tracks the location of the UE in units of cells. The calling procedure uses a discontinuous reception (DRX) parameter determined by the RNC.

(2) URA_PCH state: The same as the CELL_PCH state described above, except that the RNC tracks the position of the UE in units of URA (UTRAN Registration Area).

(3) IDLE state: The RNC does not know the location of the UE and may call the UE at the request of a core network (CN). The calling procedure is the same as the calling procedure of the CELL_PCH state described above, except that the DRX parameter determined by the core network is used. In order for the RNC and the UE to transmit and receive data, a radio resource control (RRC) will be referred to as an "RRC" connection connection (RRC CONNECTION SETUP) process.

Meanwhile, the general calling process is as follows.

First, the UE periodically receives a PICH signal transmitted from a base station, and determines whether a paging channel (PCH) signal is transmitted to itself through the received PICH signal. The information on the PICH is included in a system information block (SIB) of a broadcast channel (BCH: hereinafter referred to as "BCH"). Therefore, the UE can obtain the PICH information by checking the BCH, so that the UE can receive the PICH signal. On the other hand, the calling process refers to the overall process that the network calls any UE, the network uses the DRX scheme to minimize the power consumption of the UE in calling the UE. The DRX scheme refers to a scheme in which the UE sets in advance a point in time at which the receiver turns on to receive a paging message from the network, and receives a paging message only at the set time. Thus, the UE turns on the receiver only at a preset time point with the network by using the DRX scheme, and minimizes power consumption by turning off the receiver at other time points other than the preset time point. If this is explained in more detail as follows. The UE receives a PICH signal at a call time (PO: paging occasion, hereinafter referred to as " PO "), and a corresponding call indication (PI: paging instance, hereinafter referred to as " PI ") of the received PICH signal. If is set to "1", receive the call message transmitted through PCH.

However, as described above, the DRX method of the general calling process has to periodically transmit the PCH signal in the network, that is, the base station, and the UE also has to periodically check the PIs of the PO time points of the PICH signal and receive the PCH signal associated therewith. There is a load on both the base station and the UE.

Therefore, the present invention proposes a method of adaptively determining according to the situation, rather than periodically determining the period in which the PCH signal is transmitted and the offset information for indicating the transmission start position. That is, the present invention proposes a method of adaptively determining according to a situation in notifying the offset information of the period of the interval in which the paging information is transmitted and the position at which the period of the predetermined interval starts. In particular, in the case of MBMS service, a plurality of UEs are called for service notification in order to receive the MBMS service. In this case, it is difficult for a plurality of UEs to receive call information at the same location. This is because if the information is repeatedly transmitted and the offset is different, a plurality of UEs may ensure reliability in receiving call information. Here, there are two methods for determining the period for transmitting the PCH signal and the offset information for indicating the transmission start position, the first method is a Serving GPRS Support Node (SGSN) Is referred to as "SGSN", and the second method is determined by the RNC.

First, a method of determining offset information for informing the period in which the PCH signal is transmitted and the transmission start position in the SGSN will be described.

The SGSN determines offset information for informing the PCH transmission cycle and transmission start position by MBMS service or in a routing area (RA). The SGSN is referred to as a transmission period "PAGING_INTERVAL" for transmitting the PCH for each MBMS service and the offset information "OFFSET" for indicating the transmission start position is called a Temporary Multicast Group Identity (TMGI). It may be defined as a function of the above) or fixed to a specific value preset for each MBMS service. Here, the TMGI is a kind of identifier for identifying an MBMS service, and a unique TMGI is assigned to each MBMS service. That is, an MBMS service context for an arbitrary MBMS service is allocated the first time it is created, and is released when the MBMS service is terminated. And although there is no special rule for TMGI allocation, the SGSN allows a unique value to be assigned in one SGSN for one MBMS service.

Meanwhile, the SGSN transmits the determined transmission period PAGING_INTERVAL and offset information OFFSET to the UE through an MBMS service activation response message, which will be described later. Since the MBMS service activation response message will be described with reference to FIG. 2, a detailed description thereof will be omitted.

Then, when the PO is calculated using the transmission period PAGING_INTERVAL and the offset information OFFSET determined by the SGSN, Equation 1 is obtained.

In Equation 1, n = 1, 2, 3, ..., SFN (PO) should be less than 4095 (SFN (PO) <4095), TMGI_K is TMGI div K (TMGI_K = TMGI div K) PAGING_INTERVAL is 2 ^{PAGING_INTERVAL_COEFF} . Here, the system frame number (SFN: hereinafter referred to as "SFN") is an integer that repeatedly monotonically increases from 0 to 4095 and is frame timing information counted by the base station. In the MBMS mobile communication system, one radio frame has a length of 10 [msec]. In addition, the variable K used when calculating the TMGI_K is a second common control physical channel (S-CCPCH: Secondary Common Control Physical CHannel, hereinafter referred to as "S-CCPCH") that is set up in the corresponding cell. Indicates the number of PCH. Here, the S-CCPCH / PCH represents the S-CCPCH which is a physical channel to which the PCH is mapped.

As shown in Equation 1, the MBMS PO is a set of SFNs repeated in the MBMS transmission period PAGING_INTERVAL. In Equation 1, PAGING_INTERVAL_COEFF is a variable having one of values from 0 to 9, and the transmission period PAGING_INTERVAL is determined according to the value of PAGING_INTERVAL_COEFF. In addition, TMGI_K mode PAGING_INTERVAL in Equation 1 is used to differently set offset information OFFSET for indicating a PCH transmission start position for each TMGI, that is, for each MBMS service. As described above, the offset information OFFSET may be determined as a function of TMGI, as shown in Equation 1, or may be determined as a predetermined specific value. If the offset information OFFSET is determined to be a preset specific value that is not a function of the TMGI, the specific value should be informed to the UE together with the transmission period PAGING_INTERVAL.

Secondly, a method of determining the offset information for informing the period in which the PCH signal is transmitted and the transmission start position in the RNC will be described.

The RNC determines transmission period PAGING_INTERVAL and offset information OFFSET according to the load and channel conditions of the UTRAN. The RNC determines the transmission period PAGING_INTERVAL and the offset information OFFSET in cell units, and the transmission period PAGING_INTERVAL and the offset information OFFSET determined in the cell unit are broadcast channels (BCHs) through a broadcast control channel (BCCH). Or FACH to the UE. The RNC may determine the transmission period PAGING_INTERVAL and the offset information OFFSET in the same manner as the SGSN determines, that is, as in Equation 1 above.

Next, with reference to FIG. 2, the SGSN determines a transmission period PAGING_INTERVAL and offset information OFFSET, and transmits the determined transmission period PAGING_INTERVAL and offset information OFFSET to the UE.

2 is a signal flow diagram illustrating a control message transmission / reception process when the SGSN determines the PCH transmission period PAGING_INTERVAL and offset information OFFSET according to an embodiment of the present invention.

Before describing FIG. 2, a network structure to be described in the present invention, that is, a multicast / broadcast-service center (BM-SC) will be referred to as "BM-SC". The connection structure of the Gateway Packet Radio Service Support Node (GGSN) (hereinafter referred to as "GGSN"), SGSN, RNC, and UE has the structure as described in FIG. Let's assume.

Referring to FIG. 2, first, the core network performs a service announcement process to guide basic information on currently available MBMS services, for example, menu information, to UEs serving as MBMS service subscribers. Perform step (201). Here, the menu information is information indicating time information, duration, and the like, when a specific MBMS service is started, and the core network broadcasts the menu information to a predetermined service area, that is, a cell. A broadcast service (eg, a "Cell Broadcast Service", hereinafter referred to as "CBS") may be broadcasted through a broadcast service, or may be transmitted only to UEs having an MBMS service request. The core network informs the MBMS Service ID of the core network to differentiate and distinguish the services of each MBMS through the menu information. Since the service guide process is not directly related to the present invention, a detailed description thereof will be omitted. In addition, the core network is defined as a concept encompassing the BM-SC, GGSN, and SGSN.

The UE, which has obtained basic information on the MBMS services provided through the service guide process, receives a first MBMS service activation request (MBMS SERVICE ACTIVATION REQUEST 1) message for a specific MBMS service to be received among the MBMS services. The " MBMS SERVICE ACTIVATION REQUEST 1 message " is transmitted to the SGSN through the RNC (step 202). Here, the MBMS SERVICE ACTIVATION REQUEST 1 message includes a UE identifier (UE ID), an MBMS service identifier (MBMS SERVICE ID), and the like. Here, the MBMS service identifier is an identifier indicating the MBMS service that the UE wants to receive. Upon receiving the MBMS SERVICE ACTIVATION REQUEST 1 message from the UE, the SGSN detects an MBMS service identifier from the MBMS SERVICE ACTIVATION REQUEST 1 message and stores the UE identifier of the UE in an MBMS SERVICE CONTEXT corresponding to the MBMS service identifier. The SGSN then transmits a second MBMS SERVICE ACTIVATION REQUEST 2 message (hereinafter referred to as an "MBMS SERVICE ACTIVATION REQUEST 2 message") to the GGSN (step 202-1). Receiving the MBMS SERVICE ACTIVATION REQUEST 2 message from the SGSN, the GGSN stores the UE transmitting the MBMS SERVICE ACTIVATION REQUEST 2 message and an identifier of the RNC in the MBMS SERVICE CONTEXT of the MBMS service and requests a third MBMS service activation request (MBMS SERVICE). ACTIVATION REQUEST 3) message (hereinafter referred to as "MBMS SERVICE ACTIVATION REQUEST 3 message") is transmitted to the BM-SC (step 202-2).

After receiving the MBMS SERVICE ACTIVATION REQUEST 3 message from the GGSN, the BM-SC stores the identifier of the GGSN that transmitted the MBMS SERVICE ACTIVATION REQUEST 3 message in the MBMS SERVICE CONTEXT for the MBMS service, and then TMGI for the MBMS service. Allocate The BM-SC then sends a third MBMS SERVICE RESPONSE 3 message (hereinafter referred to as an "MBMS SERVICE RESPONSE 3 message") to the GGSN (step 203). Here, the MBMS SERVICE RESPONSE 3 message includes an MBMS service identifier indicating the MBMS service and the TMGI. Upon receiving the MBMS SERVICE RESPONSE 3 message from the BM-SC, the GGSN transmits a second MBMS SERVICE RESPONSE 2 message (hereinafter referred to as an "MBMS SERVICE RESPONSE 2 message") to the SGSN. Stage 1). Here, the MBMS SERVICE RESPONSE 2 message also includes the MBMS service identifier and the TMGI. Upon receiving the MBMS SERVICE RESPONSE 2 message from the GGSN, the SGSN determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET as described above, and determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET, and the MBMS service identifier. In step 203-2, the TMGI is included and a third MBMS SERVICE RESPONSE 3 message (hereinafter, referred to as an "MBMS SERVICE RESPONSE 3 message") is transmitted to the UE through the RNC. When the UE receives the MBMS SERVICE RESPONSE 3 message from the SGSN, the UE determines the PCH transmission cycle PAGING_INTERVAL and the offset information OFFSET included in the MBMS SERVICE RESPONSE 3 message, and determines the PCH transmission cycle PAGING_INTERVAL and the offset information OFFSET determined above. The MBMS service identifier and the TMGI are recognized.

Thereafter, the UE receives a PICH signal for each PO corresponding to a preset DRX parameter, that is, a corresponding PO, checks an unused part of the received PICH signal, and the UE wants to receive the MBMS signal. Information about whether the service is started is checked (step 204). Here, in a general PICH slot format, one radio frame of the PICH has a length of 10 ms and is composed of 300 regions b ₀ to b ₂₉₉ . That is, the one radio frame is composed of regions b ₀ to b ₂₈₇ where PI of 288 bits (288 bits) are recorded, and 12 bits (not used but currently used) to use a new purpose later. It includes an unused area, which is a kind of reserved area b ₂₈₈ to b ₂₉₉ . Thus, in the present invention, the unused area is used for MBMS call. In this case, the UE should know where the paging indication for the desired service in the unused area is. That is, the mapping relationship between the MBMS call indication (PI) and the TMGI tube can be defined as follows.

In Equation 2, N _mp denotes the number of MBMS paging indicators and may have a value of 1, 2, 3, 4, and 12. The Nmp value can be received through BCCH information in advance.

The UE monitors a paging indicator indicating that there is paging information indicating transmission of MBMS service data of its TMGI, that is, its MBGI, using the MBMS PI value determined by Equation 2 above. Here, the method for transmitting the information of the paging indicator for the MBMS from the network to the UE can be modified in various ways. In the present invention, a method for transmitting the PICH signal for each service of the MBMS through the description of FIG. Since it will be described in detail, detailed description thereof will be omitted here. On the other hand, when confirming through the Paging Indication information of the MBMS of the received PICH signal confirms that the MBMS service that the UE itself wants to receive starts, the UE uses the PCH transmission period PAGING_INTERVAL and the offset information OFFSET It will receive the PCH signal.

On the other hand, the BM-SC is called a first MBMS SERVICE NOTIFY 1 message, which is a kind of paging message indicating that the MBMS service will be started soon to SGSN (hereinafter referred to as "MBMS SERVICE NOTIFY 1 message"). ) Is transmitted (step 205). Here, the MBMS SERVICE NOTIFY 1 message includes the MBMS service identifier of the soon-to-be-started MBMS service. SGSN receiving the MBMS SERVICE NOTIFY 1 message from the BM-SC calls the RNC a second MBMS SERVICE NOTIFY 2 message indicating that the MBMS service will be started soon (hereinafter referred to as "MBMS SERVICE NOTIFY 2 message"). (Step 205-1). Here, the MBMS SERVICE NOTIFY 2 message includes the TMGI of the upcoming MBMS service. The RNC, which has received the MBMS SERVICE NOTIFY 2 message from the SGSN, will refer to a third MBMS SERVICE NOTIFY 3 message (hereinafter referred to as an "MBMS SERVICE NOTIFY 3 message") indicating that the MBMS service will soon be started to the UE. ) Is transmitted (step 205-2). Here, the MBMS SERVICE NOTIFY 3 message includes the TMGI of the upcoming MBMS service. In this case, the RNC transmits the MBMS SERVICE NOTIFY 3 message, and the MBMS SERVICE NOTIFY3 message is transmitted through PCH. That is, the present invention proposes a method of paging as a method of notifying the MBMS service to notify in advance that the MBMS service is started, and by providing the offset information to inform the transmission cycle information and the transmission start position of the PAGING signal accordingly In order to distinguish from the paging scheme of the general call, and also to effectively transmit the call information for the notification of the MBMS service, a plurality of UEs are proposed to facilitate the reception of MBMS service data.

The UE, which has detected that the requested MBMS service is to be started through the service notification process, transmits a PAGING RESPONSE message as a response to the MBMS SERVICE NOTIFY message to the core network, and then radio resource allocation. In step 206, a radio resource is actually allocated to provide the MBMS service. Here, the radio resource allocation process, the RNC informs the UEs located in any cell radio bearer information to be transmitted the MBMS service in the cell (hereinafter referred to as "radio bearer setup") &Quot; Step " and the RNC informs transport bearer information and radio bearer information to be configured on the Iub interface to cells where UEs to receive MBMS service are located (hereinafter, &quot; radio link setup &quot; ) "Step). When the radio resource allocation is completed, all UEs that want to receive a specific MBMS service are aware of radio link related information to be provided with the service and higher layer information to be processed, and cells configure the radio link and Iub interface. If one embodiment is provided, when the service notification is received through paging, the UE receives bearer information and channel information of a radio resource to receive the MBMS service data through a FACH, and accordingly MBMS The actual MBMS service data can be received through the setup process of the channel to receive the service data. Through the above process, the MBMS service is ready to be delivered to the UEs. When the radio resource allocation process is completed, all UEs that want to receive a specific MBMS service are aware of radio link related information to be provided with the specific MBMS service and higher layer information to which the service is to be processed. The radio link and Iub interface setup is completed. In this state of preparing for providing MBMS service between the RNC and the UEs, the core network performs an actual MBMS service process, that is, an MBMS data transmission process of transmitting MBMS service data to the UEs through the RNC ( Step 207). After the transmission of the MBMS service data is completed, a radio resource release process (END OF MBMS SERVICE) of releasing the set radio resources, that is, the transport bearer and the radio bearer, is performed between the UE and the core network (step 208). .

In FIG. 2, the case in which the SGSN determines transmission period PAGING_INTERVAL and offset information OFFSET is described. Next, the RNC determines transmission period PAGING_INTERVAL and offset information OFFSET with reference to FIG. 3, and determines the transmission period PAGING_INTERVAL and offset. A process of transmitting the information OFFSET to the UE will be described.

3 is a signal flow diagram illustrating a control message transmission and reception process when the RNC determines the PCH transmission period PAGING_INTERVAL and offset information OFFSET according to another embodiment of the present invention.

Referring to FIG. 3, first, a core network performs a service guide process to guide basic information on currently available MBMS services, for example, menu information to UEs serving MBMS service subscribers (step 301). Since the service guide process is the same as the service guide process described with reference to FIG. 2, a detailed description thereof will be omitted. The UE, which has obtained basic information on the MBMS services provided through the service guide process, transmits an MBMS SERVICE ACTIVATION REQUEST 1 message for a specific MBMS service to be received among the MBMS services to the SGSN through the RNC (302). step). Here, the MBMS SERVICE ACTIVATION REQUEST 1 message includes a UE identifier (UE ID), an MBMS service identifier (MBMS SERVICE ID), and the like. Upon receiving the MBMS SERVICE ACTIVATION REQUEST 1 message from the UE, the SGSN detects an MBMS service identifier from the MBMS SERVICE ACTIVATION REQUEST 1 message and stores the UE identifier of the UE in an MBMS SERVICE CONTEXT corresponding to the MBMS service identifier. The SGSN then sends an MBMS SERVICE ACTIVATION REQUEST 2 message to the GGSN (step 302-1). Receiving the MBMS SERVICE ACTIVATION REQUEST 2 message from the SGSN, the GGSN stores the UE that has transmitted the MBMS SERVICE ACTIVATION REQUEST 2 message, stores the identifier of the RNC in the MBMS SERVICE CONTEXT of the MBMS service, and stores the MBMS SERVICE ACTIVATION REQUEST 3 message. -Transmit to SC (step 302-2).

After receiving the MBMS SERVICE ACTIVATION REQUEST 3 message from the GGSN, the BM-SC stores the identifier of the GGSN that transmitted the MBMS SERVICE ACTIVATION REQUEST 3 message in the MBMS SERVICE CONTEXT for the MBMS service, and then TMGI for the MBMS service. Allocate The BM-SC then sends an MBMS SERVICE RESPONSE 3 message to the GGSN (step 303). Here, the MBMS SERVICE RESPONSE 3 message includes an MBMS service identifier indicating the MBMS service and the TMGI. Upon receiving the MBMS SERVICE RESPONSE 3 message from the BM-SC, the GGSN transmits an MBMS SERVICE RESPONSE 2 message to the SGSN (step 303-1). Here, the MBMS SERVICE RESPONSE 2 message also includes the MBMS service identifier and the TMGI. As the SGSN receives the MBMS SERVICE RESPONSE 2 message from the GGSN, the SGSN transmits an MBMS SERVICE RESPONSE 3 message to the UE through the RNC (step 303-2). When the UE receives the MBMS SERVICE RESPONSE 3 message from the SGSN, the UE recognizes the MBMS service identifier included in the MBMS SERVICE RESPONSE 3 message and the TMGI.

Thereafter, the UE receives a PICH signal for each PO corresponding to a preset DRX parameter, ie, corresponding PO, checks MBMS service call indication information included in the received PICH signal, and the UE desires to receive it. Information on whether the MBMS service is started is checked (step 304). When the MBMS service call indication information included in the received PICH signal is checked to confirm that the MBMS service that the UE wants to receive is started, the UE uses the PCH transmission period PAGING_INTERVAL and offset information OFFSET to transmit the corresponding PCH signal. Will receive. Here, the PCH transmission period PAGING_INTERVAL and offset information OFFSET is determined by the RNC in cell units according to the load and channel conditions of the UTRAN as described above, and the transmission period PAGING_INTERVAL and offset information OFFSET determined in the cell units indicate a broadcast control channel. Through the broadcast channel or the FACH through the UE. Therefore, the UE also recognizes the PCH transmission period PAGING_INTERVAL and offset information OFFSET actually received from the RNC. Meanwhile, when the PCH transmission period PAGING_INTERVAL and offset information OFFSET are changed, the RNC transmits the changed PCH transmission period PAGING_INTERVAL and offset information OFFSET to the UE, so that the UE transmits the changed PCH transmission period PAGING_INTERVAL and offset information OFFSET. Be aware.

Meanwhile, the BM-SC transmits an MBMS SERVICE NOTIFY 1 message to SGSN (step 305). Here, the MBMS SERVICE NOTIFY 1 message includes the MBMS service identifier of the soon-to-be-started MBMS service. Upon receiving the MBMS SERVICE NOTIFY 1 message from the BM-SC, the SGSN transmits an MBMS SERVICE NOTIFY 2 message to the RNC indicating that the MBMS service will start soon (step 305-1). Here, the MBMS SERVICE NOTIFY 2 message includes the TMGI of the upcoming MBMS service. Receiving the MBMS SERVICE NOTIFY 2 message from the SGSN, the RNC transmits an MBMS SERVICE NOTIFY 3 message to the base station Node B indicating that the MBMS service will be started soon (step 305-2), and the base station transmits to the UE. The MBMS SERVICE NOTIFY 4 message is transmitted (step 305-3). In addition, when the RNC transmits the MBMS SERVICE NOTIFY 3 message, the RNC includes paging indicator information for notifying that the MBMS service will be started in an unused area of an existing PICH among PIs at the PO point of the MBMS service. Send to the UEs. Since the subsequent steps 306 to 308 operate in the same manner as the steps 206 to 208 described with reference to FIG. 2, the detailed description thereof will be omitted.

Meanwhile, the RNC informs the base station of the transmission period PAGING_INTERVAL and the offset information OFFSET to the base station through a frame protocol, and the base station transmits the PCH signal to the UEs corresponding to the transmission period PAGING_INTERVAL and the offset information OFFSET. Since the process will be described in detail below, the detailed description thereof will be omitted.

Meanwhile, in order to support PICH transmission for transmitting the MBMS call information, a data frame for the Iub frame protocol between the RNC and the base station is newly defined, which will be described with reference to FIG. 4. That is, FIG. 4 describes a method of transmitting information on paging indication from the RNC to the Node through the Iub Frame Protocol to transmit paging indication information on various services of the MBMS as mentioned above. This may be presented as an embodiment for configuring and transmitting a PICH signal for each service of the MBMS.

4 is a diagram schematically illustrating a data frame structure of an Iub frame protocol according to an embodiment of the present invention.

Referring to FIG. 4, first, the data frame structure of the Iub frame protocol should be changed to a new structure instead of the data frame structure of the general Iub frame protocol in order to support the transmission of MBMS call information using an unused region. The RNC transmits an MBMS service identifier to a base station through a data frame of the Iub frame protocol. In the present invention, the RNC transmits the MBMS service identifier to the base station using the unused area. Therefore, FIG. 4 illustrates a data frame structure of a new Iub frame protocol in which an MBMS PI bitmap is added to a data frame structure of a general Iub frame protocol. MBMS Indication (MI) in the data frame structure of the Iub frame protocol indicates whether the MBMS PI bitmap is in a payload, and when the MBMS indication is set to "0", the MBMS PI The bitmap does not exist, and when the MBMS indication is set to "1", the MBMS PI bitmap exists. In addition, the MBMS indication may have one, two, three, four, six, or twelve indications according to the value of the MBMS PI bitmap, and the MBMS PI bit. The map field has a size of 2 bytes. In the data frame structure of the Iub frame protocol, a PICH duration tells a base station how long to transmit a PICH. On the other hand, the present invention provides a method for continuously transmitting the MBMS indication to the PICH for a predetermined set time instead of being able to variably set the period for transmitting the MBMS PCH. That is, the PICH interval parameter repeatedly transmits an indication related to the MBMS service for a time designated by the PICH interval repeatedly after the current PICH transmission.

In addition, the following two methods may be considered in transferring information required for transmitting the PCH and the PICH to the base station through the Iub frame protocol, and the two methods are as follows.

In the first method, the RNC delivers the transmission period PAGING_INTERVAL and offset information OFFSET related to the PICH transmission and the PCH transmission to the base station using the frame protocol.

In the first method, when the time point at which the PCH for the MBMS call is transmitted is the same as the time point at which the general PCH is transmitted, the RNC multiplexes (MUX) the PCH for the MBMS call and the general PCH. In this case, the RNC transmits a transmission period PAGING_INTERVAL and offset information OFFSET related to the PICH transmission and the PCH transmission to a base station through a data frame of the Iub frame protocol whenever it is time to transmit the PICH or PCH. Then, the base station maps PICH and PCH to actual physical channels, that is, PICH and S-CCPCH, in correspondence with the transmission period PAGING_INTERVAL and offset information OFFSET received from the RNC. In this case, the PICH DURATION information does not need to be transmitted in the data frame structure of the Iub frame protocol illustrated in FIG. 4, but only the PICH is transmitted because only the period for transmitting the PCH is controlled.

In the second method, when the RNC transmits the transmission period PAGING_INTERVAL related to the PICH transmission and the PCH transmission and the offset information OFFSET to the base station using the frame protocol, the preset number of times of setting the PICH indicating the MBMS call related information since the current transmission It is a method to send a message to repeat. Then, the base station repeatedly transmits the PICH the set number of times since the current transmission, corresponding to the transmission period PAGING_INTERVAL received from the RNC and the offset information OFFSET. In this case, the base station repeatedly transmits the PICH to reduce the RNC load.

Meanwhile, in order to support transmission of call information for notification of an MBMS service, such as the present invention, that is, PCH signal transmission, an MBMS paging message supporting the MBMS call in a general paging type I message is required. Must be added. Of course, the MBMS call message may be implemented as a separate new structure, but the present invention will be described on the assumption that it is implemented by changing or adding the existing call type 1 message.

In this case, information elements (IE) (hereinafter referred to as "IE") added for the MBMS call to the existing paging type I message will be described as follows.

The "Terminating MBMS Call" item may be added to the IE Paging Cause of the existing call type 1 message, and the TMGI item may be added to the IE UE identity. That is, when the UE receives the paging message, the " terminating MBMS call " means that the paging message has a meaning of notification indicating that the MBMS service will be started. Also here, the TMGI is not actually a UE identifier but an identifier indicating the MBMS service that the UE wishes to receive. Therefore, by adding a paging cause to the call type 1 message, it is recognized that the paging for the MBMS service, and whether through the TMGI whether the paging for the MBMS service requested by the MBMS service. In addition, MBMS radio bearer information may be additionally included in the call type 1 message. The MBMS radio bearer information includes layer 2 (Layer 2, hereinafter referred to as "L2") information and layer 1 (Layer 1, hereinafter "L1"). Information, which is referred to as " RLC ", is referred to as Radio Link Control (RLC) / Packet Data Convergence Protocol (PDCP). PDCP) may be included. The L1 information includes a transport format set (TFS) information and a transport format combination set (TFCS) information. And channelization code information, transmission power related information, activation time information, and the like. Meanwhile, the existing call type 1 message includes BCCH modification information, and transmits transmission period PAGING_INTERVAL and offset information OFFSET information determined by the RNC to the UE through the BCCH modification information, and also transmits the transmission period PAGING_INTERVAL and When the offset information OFFSET information is changed, it is also transmitted to the UE through the BCCH modification information.

If the RNC varies the number of PCH signal transmissions for transmitting the MBMS-related call information, when the RNC transmits information on the MBMS service that a specific UE wants to receive only once, the UE receives the MBMS indication transmitted through the PICH. If the MBMS indication is an MBMS service that the UE itself wants to receive, it should receive a PCH signal for transmitting the MBMS call information. However, when the PCH transmission has been completed at a previous time point on the basis of the point in time at which the UE intends to receive the PCH signal for transmitting the MBMS call information, it is impossible to obtain MBMS related information. Thus, the RNC repeats the PCH signal for transmitting the MBMS related call information by a preset number of times, and a new IE indicating how many more times of transmission of the same MBMS related call information remains in the existing call type 1 message. Add Herein, an IE indicating how many more times of transmission of the same MBMS call information remains is defined as "paging RES". The UE can predict the number of times the same MBMS related call information is repeatedly transmitted at a time after the current time point by using the paging RES, thus eliminating the case of repeatedly demodulating the previously received MBMS related call information. do.

Next, a process of receiving a PICH signal and a PCH signal of an actual UE will be described with reference to FIG. 5.

FIG. 5 is a diagram schematically illustrating a time point of receiving a PICH signal and a PCH signal of a UE according to an embodiment of the present invention. In particular, the UE DRX cycle length is 5.12 seconds, and a PCH for MBMS call is shown. FIG. Is a diagram schematically illustrating a PICH and PCH reception timing of a UE when transmitting once every 512 frames.

Referring to FIG. 5, first, a certain UE wakes up to monitor a PI transmitted at a corresponding PO time of a PICH radio frame transmitted at a time of SFN2. Here, the PIs monitored by the UE are PIs included in an unused area in a PI indicating a general PCH transmission and an existing PICH signal indicating a PCH transmission for an MBMS service. The UE demodulates the PI indicating the general PCH signal transmission and also demodulates the MBMS PIs indicating the PCH signal transmission for the MBMS service. In FIG. 5, the PI representing the general PCH transmission is demodulated to "-1", that is, the PI representing the general PCH transmission indicates that there is no PCH transmission associated with it, and the PIs indicating the PCH transmission for the MBMS service are It is assumed that the UE includes information indicating that the MBMS service is started which is identical to the MBMS service identifier to be received, that is, indicating that there is PCH transmission for the MBMS call. The UE then prepares for PCH reception for the MBMS call transmitted in association with the PICH since the PIs indicating the PCH transmission for the MBMS service indicated that the MBMS service that the UE intends to receive is started. However, even if the UE intends to receive the PCH for the MBMS call, the PCH signal for the MBMS call is already transmitted and then waits to demodulate the PCH signal for the next MBMS call. At this point, if enough time remains from the current time to the transmission time of the PCH for the next MBMS call, the UE transitions to the sleep mode and at the time of transmitting the PCH signal for the next MBMS call in the sleep mode. It wakes up and receives the PCH signal for the MBMS call. Meanwhile, in FIG. 5, since the time point for receiving the PCH for the next MBMS call and the time point for monitoring the PI are almost the same, that is, the time point for monitoring the PI slightly precedes the time point for receiving the PCH for the next MBMS call. The UE is asleep until the point in time to monitor the PI. If the next result of demodulation of the PI by the UE is “1”, the general PCH signal is also demodulated, and the PCH signal for the MBMS service is also demodulated.

Next, the operation of the UE according to the present invention will be described with reference to FIG. 6.

6 is a flowchart illustrating a UE operation process according to an embodiment of the present invention.

Referring to FIG. 6, first, in step 601, a UE performs a DRX parameter from a network, that is, a UTRAN, a DRX cycle length, and a DRX parameter such as a PICH Orthogonal Variable Spreading Factor (OVSF) code and an MBMS call. After receiving the related parameter, that is, the parameter described in Equation 1, the process proceeds to step 602. In step 602, the UE starts a DRX operation according to the received DRX parameter and proceeds to step 603. As described above, the DRX operation refers to an operation of receiving a PICH corresponding to the DRX parameter and transitioning to a sleep mode in intervals other than the PICH reception interval. In step 603, the UE checks whether it is time to receive a PCH signal for MBMS call associated with a previously confirmed PICH, that is, a PCH signal for pending MBMS call. If the check result is a time point for receiving a PCH signal for MBMS call associated with the previously confirmed PICH, the UE proceeds to step 604. In step 604, the UE receives and terminates a PCH signal for the MBMS call.

On the other hand, if the test result in step 603 is not the time to receive the PCH signal for MBMS call associated with the previously confirmed PICH, the UE proceeds to step 607. In step 607, the UE checks whether it is time to receive a PICH signal. If the check result is not the time to receive the PICH signal, the UE returns to step 603. If the check result indicates that the PICH signal is received, the UE proceeds to step 609. In step 609, the UE receives the PICH signal at that time and demodulates the received PICH signal to check whether the PICH demodulation result PI is set to 1 (PI == 1). If the PI is set to 1 as a result of the test, the UE proceeds to step 610. In step 610, the UE receives and demodulates a PCH signal associated with the received PICH signal and ends. If the result of the check in step 609 is that the PI is not set to 1, the UE returns to step 603.

On the other hand, if it is time to receive the PICH signal as a result of the check in step 607, the UE proceeds to step 612 as well as step 609. In step 612, the UE checks whether it is time to receive a PCH signal for MBMS call associated with the previously confirmed PICH, that is, a PCH signal for pending MBMS call. If the check result is not the time to receive the PCH signal for the MBMS call associated with the previously confirmed PICH, the UE proceeds to step 613. In step 613, the UE receives the PICH signal at that time and demodulates the received PICH signal to check whether the MBMS PI of the unused region is set to 1 in the PICH demodulation result. If the MBMS PI is not set to 1 as a result of the check, the UE returns to step 603. If the MBMS PI is set to 1 as a result of the check in step 613, the UE proceeds to step 614. In step 614, the UE checks whether a PCH transmitting the MBMS related call information will be received at a close time point. Here, since the UE has already recognized and recognized the transmission period PAGING_INTERVAL and the offset information OFFSET information of the PCH through which MBMS-related call information is transmitted from the RNC, it is possible to predict when the MBMS-related PCH signal is received. In addition, the close time point means a time that is close to the extent that a gain due to the DRX operation of the UE cannot be obtained. The UE returns to step 603 if the MBMS related PCH is not received at a near point in the test result. If the MBMS-related PCH is to be received at a near point in the test result in step 614, the UE proceeds to step 616. In step 616, the UE receives, demodulates and terminates the MBMS-related PCH signal. On the other hand, when it is time to receive a PCH signal for MBMS call associated with the previously confirmed PICH as a result of the check in step 612, the UE proceeds to step 616.

Next, the operation of the RNC according to the embodiment of the present invention will be described with reference to FIG. 7.

7 is a flowchart illustrating an RNC operation process according to an embodiment of the present invention.

Before describing FIG. 7, it is assumed that the start time of the RNC operation process described with reference to FIG. 7 is a time point after receiving MBMS-related messages from SGSN as described with reference to FIGS. 2 and 3. Here, the time point after receiving the MBMS-related messages received from the SGSN is an identifier for identifying the MBMS service when the SGSN determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET as described in FIG. That is, it is a time point after receiving the UE ID which is the identifier of UEs which want to receive the TMGI and the MBMS service, the PCH transmission period PAGING_INTERVAL and the offset information OFFSET. On the contrary, when the RNC determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET as described with reference to FIG. 3, the time point after the reception of the MBMS-related messages received from the SGSN is determined by the PCH transmission period PAGING_INTERVAL and the offset information OFFSET. Since it is determined by the RNC, it is a time after receiving only the TMGI and the UE ID.

Referring to FIG. 7, in step 701, the RNC checks whether a PCH transmission period PAGING_INTERVAL and offset information OFFSET for MBMS service are received from SGSN. If the test result has not received the PCH transmission period PAGING_INTERVAL and the offset information OFFSET for the MBMS service, the RNC proceeds to step 702. In the case where the RNC determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET as described with reference to FIG. 3, in step 701, the RNC has not received the PCH transmission period PAGING_INTERVAL and the offset information OFFSET for the MBMS service. Will be. In step 702, the RNC calculates the PCH transmission period PAGING_INTERVAL and the offset information OFFSET using the TMGI received from the SGSN. Here, since the RNC calculates the PCH transmission period PAGING_INTERVAL and the offset information OFFSET using the TMGI received from the SGSN, the detailed description thereof will be omitted here. On the other hand, when the test result in step 701 receives the PCH transmission period PAGING_INTERVAL and the offset information OFFSET for the MBMS service, the ENC proceeds to step 703. When SGSN determines the PCH transmission period PAGING_INTERVAL and the offset information OFFSET as described in 2, the PCH transmission period PAGING_INTERVAL and the offset information OFFSET for the MBMS service are received in step 701.

In step 703, the RNC transmits the PCH transmission period PAGING_INTERVAL, offset information OFFSET, and TMGI to the UE. In step 704, the RNC sets MBMS indication (MI) to 1 in the data frame structure of the Iub frame protocol to transmit the PCH transmission period PAGING_INTERVAL and offset information OFFSET, and sets the MBMS PI bitmap and PICH interval (DURATION). Set and send to the base station. In this case, the MBMS indication MI indicates whether the MBMS PI bitmap exists in the payload of the data frame of the Iub frame protocol as described above, and the MBMS PI bitmap is a value indicating on / off of the MBMS PI. The PICH interval is a value indicating how many times the MBMS PI is repeatedly transmitted. On the other hand, the PCH transmission period PAGING_INTERVAL and the offset information OFFSET to the UE in step 703, the TMGI transmission time and the data frame transmission of the Iub frame protocol to the base station in step 704 may be the same time, or different Of course it can be a point in time.

In step 705, the RNC transmits the call type 1 message proposed by the present invention to the base station so that the UE can receive the PCH according to the PCH transmission period PAGING_INTERVAL and the offset information OFFSET transmitted to the UE. Here, the call type 1 message proposed by the present invention adds a "Terminating MBMS Call" item indicating that the MBMS service will be started to the IE Paging Cause of the existing call type 1 message as described above, and the IE UE identifier (UE Identity). TMGI item is added to the message and Paging RES IE is added to indicate how many more times the same MBMS related call information is transmitted. Here, the number of times of transmitting the call type 1 message may be set in advance. For example, it is assumed that the call type 1 message is set to m times. In step 706, the RNC checks whether the call type 1 message has been transmitted m times. If the check result does not transmit the call type 1 message m times, the RNC returns to step 705. Meanwhile, in step 706, when the call type 1 message is transmitted m times, the RNC ends. As described above, according to the present invention, a PCH having MBMS-related information can be repeatedly transmitted a plurality of times during the PICH interval, so that the RNC determines the number of repeated transmission m of the PCH by the PICH interval and offset information offset or It may be decided in advance by the system.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention transmits information related to PCH including call information for providing the MBMS service in a mobile communication system providing an MBMS service through an unused area of a general PICH and provides the MBMS service. The present invention proposes an efficient method of paging for a plurality of UEs for MBMS service by varying the transmission period and the transmission time of a PCH including call information. The MBMS service is based on the offset information and the transmission period information. The present invention proposes a method for receiving paging information at an appropriate time for a situation of a plurality of UEs requesting the. In addition, the repeated transmission of paging for the MBMS service has an advantage of providing reliability that can be effectively received by a plurality of UEs.

Claims (18)

A first call indication information area indicating that there is a call related to the first service to provide a first service, a second service different from the first service, and a second indicating that there is a call related to the second service A method for transmitting call information related to the second service in a mobile communication system transmitting a call indication channel signal including a call indication information area, Transmitting offset information for indicating a transmission period for transmitting the second service call information and a transmission start position thereof; And repeatedly transmitting the second service call information a predetermined number of times at a transmission start position determined according to the offset information. The method of claim 1, Wherein the transmission period and offset information are determined on a cell-by-cell basis corresponding to the channel condition. The method of claim 1, And transmitting the transmission period and the offset information to a user terminal receiving the second service through a common channel. The method of claim 1, And transmitting the transmission period and the offset information to a base station that provides the second service through a data frame of a frame protocol. The method of claim 4, wherein The data frame includes information indicating a section in which the call indication channel should be transmitted corresponding to the transmission period, and identifier information indicating the second service. A first call indication information area indicating that there is a call related to the first service to provide a first service, a second service different from the first service, and a second indicating that there is a call related to the second service A method for transmitting call information related to the second service in a mobile communication system transmitting a call indication channel signal including a call indication information area, When the second service reception request is detected from the user terminal, a service packet radio service support node (SGSN) serving offset information for informing a transmission period of transmitting call information related to the second service and a transmission start position thereof. Transmitting to a radio network controller (RNC); The RNC transmitting a call indication channel signal including the second call indication information area; The RNC repeatedly transmitting the second service call information a predetermined number of times at the transmission start position corresponding to the offset information after transmitting the call indication channel signal. The method of claim 6, The transmission period and the offset information is characterized in that determined for each service or unit of routing area of the second service. The method of claim 7, wherein And wherein the transmission period and the offset information are determined with a function of a service identifier given for each service of the second service or determined to be a preset value. The method of claim 8, Wherein the function is represented by Equation 3 below. In Equation 3, PAGING_INTERVAL is the transmission period, PAGING_INTERVAL is 2 ^{PAGING_INTERVAL_COEFF} , the PAGING_INTERVAL_COEFF is one integer from 0 to 9, n is a positive integer (n = 1, 2, ... TMGI is the service identifier, and K is the number of physical channels for transmitting the second service call information set up in the cell to which the user terminal belongs. The method of claim 6, The RNC further comprises the step of transmitting the transmission period and offset information to the user terminal through a common channel. The method of claim 6, The RNC further comprises the step of transmitting the transmission period and the offset information to the base station through the data frame of the frame protocol. The method of claim 11, The data frame includes information indicating a section in which the call indication channel should be transmitted corresponding to the transmission period, and identifier information indicating the second service. A call indication information area including a first service indication information indicating that there is a call related to the first service to provide a second service different from the first service, and a call related to the second service. A method for receiving call information related to the second service in a mobile communication system that receives a call indication channel signal having a second call indication information area including second call indication information indicating that there is a message. Receiving offset information indicating a reception period for receiving the second service call information and a reception start position thereof; Receiving the call indication channel signal at a preset time point and detecting the second call indication information from the call indication channel signal; And if the second call indication information indicates that there is call information of the second service, receiving the second service call information according to the reception period and the offset information. The method of claim 13, Receiving the second service call information may include receiving the second service call information at a next reception start position when a reception start position corresponding to offset information has already elapsed at the point of time when the second call indication information is detected. Said method, characterized in that. The method of claim 13, The reception period and the offset information is determined in cell units corresponding to the channel conditions. A first service call identifier indicating that there is a call related to the first service to provide a first service, a second service different from the first service, and location information to which call information related to the first service is transmitted; A method of transmitting call information related to the second service in a mobile communication system for transmitting a first service call information bitmap including a frame protocol message, the method comprising: If it is detected that call information related to the second service should be transmitted, a second service call identifier indicating whether a call related to the second service and a second service call information bitmap indicating whether a call related to the second service exists. Generating a frame protocol message comprising a; And transmitting the generated frame protocol message to a base station. The method of claim 16, The frame protocol message may further include location information on which call information related to the second service is transmitted. The method of claim 16, And detecting that call information related to the second service is to be transmitted from a service packet radio service support node.