MXPA06009241A - Transmitting and receiving control information for multimedia broadcast/multicast service in mobile communication system - Google Patents

Abstract

To minimize data loss as a mobile terminal unnecessarily reads an MBMS control channel (MCCH) in the course of receiving MBMS data, an MBMS control information reception indication message comprising attribute information of control information for an MBMS service is transmitted to the mobile terminal. The mobile terminal then selectively reads the MCCH to receive the control information according to the attribute information contained in the indication message.

Description

TRANSMISSION AND RECEIPT OF CONTROL INFORMATION FOR MULTIMEDIA MULTIMEDIA TRANSMISSION / MULTIMEDIA TRANSMISSION SERVICE IN A MOBILE COMMUNICATIONS SYSTEM FIELD OF THE INVENTION The present invention relates to a multimedia transmission / transmission service (MBMS) and, more particularly, to the transmission and reception of control information for an MBMS.

BACKGROUND OF THE INVENTION The Universal Mobile Telecommunications Systems (UMTS) is a third generation mobile communications system that evolves from the global system for the mobile communication system (GSM), which is a European standard. The UMTS aims to provide enhanced mobile communications services based on the central GSM network and broadband code division multiple access technologies. A UMTS network structure of the related art 1 is illustrated in Figure 1. As shown, a mobile terminal, or user equipment (UE) 2 is connected to a central network (CN) 4 through an access network UMTS Terrestrial Radio (UTRAN) 6. The UTRAN 6 configures, maintains and manages a radio access bearer for communications between the UE 2 and the core network 4 to comply with the end-to-end quality of service requirements. The UTRAN 6 includes a plurality of radio network subsystems (RNS) 8, each of which comprises a radio network controller (RNC) 10 for a plurality of base stations, or Node Bs. The RBC 10 connected to a given base station 12 is the control RNC to allocate to manage the common resources provided by any number of UEs 2 operating in a cell. There are one or more cells in a Node B. The control RNC 10 controls the traffic load, cell congestion and the acceptance of new radio links. Each Node B 12 can receive an uplink signal from a UE 2 and can transmit a downlink signal to the UE 2. Each Node B 12 serves as an access point to allow a UE 2 to connect to the UTRAN 6 , while an RNC 10 serves as an access point for connecting the Node Bs corresponding to the central network 4. Among the radio network subsystems 8 of the UTRAN, the serving RNC 10 is the RNC that manages the radio resources dedicated for the provision of services to a specific UE 2 and is the access point to the core network 4 for the transfer of data to the specific UE. All other RNCs 10 connected to the UE2 are drifting RNCs, such that there is only one service RNC connecting the UE to the core network 4 via the UTRAN 6. The drift RNCs 10 facilitate routing of user data and assign codes in the form of common resources. The interface between UE 2 and UTRAN 16 is made through a radio interface protocol established according to the radio access network specifications that describe a physical layer (L1), a data link layer (L2). ) and a network layer (L3) described in, for example, the 3GPP specifications. These strata are based on the three lower strata of an open-system interconnection (OSI) model that is well known in communications systems. An architecture related to the subject matter of the protocol The radio interface is illustrated in Figure 2. As shown, the radio interface protocol is divided horizontally into the physical stratum, the data link layer and the network layer, and is divided vertically into a plane of user to transport data traffic, such as voice signals and protocol packet transmissions from the Internet; and a control plane for transporting control information for the maintenance and administration of the interface. The physical stratum (PHY) provides information transfer service to a higher stratum and is linked by means of transport channels to a medium access control stratum (MAC). The data travels between the MAC stratum and the physical stratum via a transport channel. As well, the transmission of data is done through the physical channel between different physical layers, particularly between the physical strata on one side that performs the sending (transmitter) and a receiving (transmitting) side. The MAC stratum of the second stratum (L2) provides information transfer service to a higher stratum and is linked by means of a logical channel to a radio link control stratum (RLC). The RLC stratum of the second stratum (L2) supports the transmission of reliable data and can perform segmentation and concatenation functions for the received RLC service data units (SDUs) from a higher stratum. The radio resource control stratum (RRC) located in the lower portion of the third stratum (L3) is defined only in the control plane and controls the transport channels and physical channels with respect to the establishment, restoration and release of carriers of radio. A radio bearer (RB) is a service provided by a lower layer, such as the RLC layer or the MAC layer, for data transfer between the UE 2 and the UTRAN 6. The establishment of a RB determines the regulatory characteristics of the protocol stratum and the necessary channel to provide a specific service, establishing in this way the parameters and methods of operation of the service. When a connection is established to allow transmission between a RRC layer of a specific UE 2 and a RRC layer of the UTRAN 6, the UE 2 is that which is in the connected RRC state. Without such a connection, UE 2 is in an inactive state.

Next, a multi-media transmission / transmission service (MBMS or "MBMS service") will be described. MBMS refers to a method for providing streaming or backup services to a plurality of UEs 2 using a dedicated downlink MBMS radio bearer that uses at least one of a radio bearer point to multiple points and point a point. An MBMS service includes one or more sessions and the MBMS data is transmitted to the plurality of terminals through the MBMS radio bearer only while the session is in process. As the name implies, an MBMS can be performed in a transmission mode or a multiple transmission mode. The transmission mode is for the transmission of multimedia data to all the UEs 2 within a transmission area, for example, the domain where the transmission is available. The transmission mode is for the transmission of multimedia data to a specific UE 2 group within a multiple transmission area, for example, the domain in which the multimedia transmission service is available. The UTRAN 6 provides the MBMS service to the UEs 2 using the RB. The RB used by the UTRAN 6 can be classified as a point-to-point RB or a point-to-point RB. The point-to-point RB is a bidirectional RB, which includes a logical channel DTCH (dedicated traffic channel), a transport channel (DCH) (dedicated channel) and a physical channel DPCH (dedicated physical channel) or SCCPCH (physical channel of secondary common control).

The point-to-multipoint RB is a one-way downlink RB, which includes a logical channel MTCH (traffic channel MBMS), a transport channel FACH (send access channel), and the physical channel SCCPCH, as shown in Figure 3. The MTCH logical channel is configured for each MBMS service provided to a cell and used to transmit user plane data of a specific MBMS service to the UEs 2. The UTRAN 2 providing the MBMS service transmits information from control related to the MBMS to the plurality of terminals (UEs 2) through an MCCH (MBMS control channel). At this point, the logical channel MCCH is the downlink channel from point to multiple points and is mapped for the FACH, which is mapped to the SCCPCH. The control information related to the MBMS includes a login to indicate the start of an MBMS service, a session term to indicate the MBMS service term, an RB type indicator to indicate whether the MBMS service is provided by means of a point-to-point RB or an RB point to multiple points, RB information to provide point RB information to multiple points, such as the MTCH if the RB is a point-to-multiple point RB, counting information to measure the number of points terminals that wish to receive the MBMS service and the new count of the information to count again the number of terminals that want the MBMS service, while the MBMS service is provided.

The control information related to the MBMS may be included in a separate message and transmitted or it may be included in its entirety in an MBMS control message. To transmit the various information controls related to the MBMS service, the MCCH logical channel is used. The mapping of the MCCH channel is similar to that of the MTCH. Particularly, the MCCH is a downlink channel from point to multiple points and is mapped for the transport channel FACH, which is mapped for the physical channel SCCPCH. By reference, only one MTCH is provided for a service, while only one MCCH is provided for one cell. The terminal (UE) 2 that wishes to receive an MBMS service, must first receive the MBMS control information through the MCCH. However, because terminal 2 can only receive one SCCPCH for the MBMS, and the MCCH is transmitted through a different SCCPCH not related to the MTCH, the terminal can not receive the MCCH if the terminal has already received one or more MBMS services. An indication message for receiving control information MBMS (MCCH indication message) is used to indicate information to terminals that receive one or more MBMS services, ie, that receive the MTCH. The MCCH indication message was transmitted through the SCCPCH. The MTCH is also transmitted through the SCCPCH. In order to receive the MBMS data, the mobile terminal 2 receives an SCCPCH. The UTRAN 6 transmits the MCCH indication message through the SCCPCH, such that the mobile terminal 2 can receive the control information transmitted through the MCCH. In this case, the MCCH indication message may be transmitted through the MTCH of the mobile terminal 2 being received, or through an auxiliary channel, such as a secondary MCCH (S-MCCH), where the S-MCCH is mapped for the same SCCPCH as the MTCH. The S-MCCH is an arbitrary channel, which may be a dedicated channel, such as a DCCH (dedicated control channel), a common channel, such as a CCCH (common control channel), or a new or common dedicated channel . Regardless of which channel is used, the MCCH indication information is transmitted through the same SCCPCH for which the MTCH is mapped. The MCCH indication message is a 1-bit indication message. When certain control information is transmitted, this is transmitted through the MCCH, the indication message MCCH is used to indicate that the mobile terminal 2 must receive the control information. Particularly, when the terminal 2 receives the MCCH indication message in the course of receiving the MTCH, the mobile terminal 2 changes the SCCPCH channel through which the MTCH is transmitted to the SCCPCH through which the MCCH is transmitted, and it receives the MBMS control information transmitted through the MCCH. After the mobile terminal 2 receives the desired MBMS control information through the MCCH, the mobile terminal 2 then changes the SCCPCH for which the MTCH is mapped and receives the MTCH.

In the MCCH indication message of the related art, the 1-bit indication message indicates only the mobile terminal 2 to receive the MCCH. This method is advantageous in the sense that the amount of transmission of the indication message can be maximized. However, the MCCH indication message of the related art also has the following problems. First, the mobile terminal 2 does not know which service indicates to receive the MCCH indication message. Accordingly, the mobile terminal 2 may receive an unnecessary MCCH indication message even when it is the control information transmitted for a service that the mobile terminal 2 does not wish to receive. Additionally, the mobile terminal 2 does not know what control information the MCCH indication message receives. Accordingly, when various types of control information are transmitted continuously, the mobile terminal 2 does not know what control information to receive, and additionally does not know at what time the MTCH must be received again. Furthermore, if the same control information is transmitted repeatedly several times, terminal 2 will unnecessarily receive the control message already received again. Accordingly, in the related art, the mobile terminal 2, frequently receives the MCCH unnecessarily. This is problematic because while the mobile terminal 2 receives the MCCH, it can not receive the MTCH. Therefore, the MBMS data is lost. Accordingly, as the mobile terminal 2 reads more MCCHs, the loss of the MBMS data is increased. Accordingly, a method is required to minimize the number of times the MCCH is read by the mobile terminal 2.

BRIEF DESCRIPTION OF THE INVENTION Technical problem The present invention is directed to a method for transmitting and receiving control information for an MBMS.

TECHNICAL SOLUTION The additional features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. The objects and other advantages of the present invention will be understood and achieved by the structure indicated in a particular way in the written description and the Claims set forth in this document, as well as in the attached drawings. To achieve these and other advantages and in accordance with the purpose of the present invention, as widely represented and described, the present invention is represented in a method for receiving a multiple point-to-point service in a wireless communication system, wherein the method comprises receiving a control information indication message for a multiple point-to-point service, the control information indication message has attribute information to receive at least one control information message from a channel of point control to multiple points, wherein the control information indication message and the at least one control information message, are multiple point-to-point messages created from the same protocol layer, determine to receive the minus a control information message according to the attribute information, and receive the at least one me control information message through the point-to-multiple control channel if a mobile terminal determines to receive the at least one control information message. If the mobile terminal determines not to receive the at least one control information message, the mobile terminal does not receive the at least one control information message. In accordance with one aspect of the present invention, the step of determining to receive the at least one control information message according to the attribute information comprises verifying an update of the at least one control information message for the service. point to multiple points subscribed by the mobile terminal based on the control information indication message and the determination to receive at least one control information message if the at least one control information message is updated.

The method further comprises changing from a previously received traffic channel to the point control channel to multiple points to receive the control information message. Preferably, the method comprises changing from a traffic channel received prior to the point control channel to multiple points by determining to receive the at least one control information message. The message also comprises processing the at least one control information message and changing the control channel from point to multiple points to a traffic channel to receive the point-to-multiple service. In accordance with another aspect of the present invention, the attribute information comprises a multiple point-to-point service ID associated with the point-to-multiple point service. Additionally, the step of determining to receive the at least one control information message according to the attribute information comprises verifying the point-to-multiple point service ID if the point-to-multiple point service ID is included in the information. and determining which control information message is to be received from the point-to-point control channel if the point-to-point service ID is related to the multiple point-to-point service subscribed by the mobile terminal. If the point-to-point multiple point service ID is not related to the multiple point-to-point service subscribed by the mobile terminal, the mobile terminal continues to receive a previously received traffic channel before receiving the control information indication message. . The traffic channel can be one of the traffic channel from point to multiple points and a traffic channel from point to point. Preferably, the attribute information comprises at least one of a control information identifier associated with the at least one control information message, updating the information associated with the at least one control information message and timing the information associated with the point-to-multiple point service. The update information indicates the update of information from the at least one control information message for the point-to-multiple point service. The timing information indicates which part of the control channel from point to multiple points will be received. Preferably, the timing information indicates a start time of the reception of the point-to-multiple point control channel. Also, the mobile terminal may receive the control channel from point to multiple points for a duration according to the timing information. Alternatively, the mobile terminal stops receiving the control channel from point to multiple points at a time of termination according to the timing information. According to a further aspect of the present invention, the method comprises verifying the control information identifier, if the control information identifier is included in the attribute information and which receives the at least one control information message. if the control information dentifier is related to the mobile terminal. According to one aspect of the present invention, the method comprises verifying the update information if the update information is included in the attribute information, comparing the update information with the previously stored update information, and receiving the less a control information message if update information was not previously stored or if the update information is different from the previously stored update information. According to another aspect of the present invention, the method comprises verifying the timing information if the timing information is included in the attribute information and which receives the at least one control information message according to an interval of time indicated by the timing information. Preferably, the control information indication message is received through an MTCH, the control information indication message is received through an S-MCCH, the point-to-multiple control channel is an MCCH, and the Traffic channel is an MTCH. According to another embodiment of the present invention, a method for transmitting a multiple point-to-point service in a wireless communication system comprises transmitting a control information indication message for a multiple point-to-point service for a mobile terminal. , the control information indication message having attribute information to transmit at least one control information message through a point to multiple point control channel, wherein the control information indication message and the at least one control information message are multiple point-to-point messages created from the same protocol layer, and transmit the at least one control information message through the point-to-multiple point control channel. According to one aspect of the present invention, the mobile terminal determines to receive at least one control information message comprising verifying an update of the at least one control information message for the multiple point-to-multiple service subscribed by the terminal mobile based on the control information indication message and determine to receive the at least one control information message if the at least one control information message is updated. According to another aspect of the present invention, the mobile terminal determines to receive the at least one control information message according to the attribute information, wherein the attribute information comprises a multiple point-to-point service ID. associated with the point-to-multiple point service. A method for the mobile terminal that determines to receive the at least one control information message according to the attribute information, comprises checking the point-to-multiple service ID if the point-to-multiple service ID is included. in the attribute information and determines which control information message will be received from the point-to-multiple point control channel if the point-to-multiple point service ID is related to a multiple point-to-point service subscribed by the mobile terminal. If the multiple point-to-point service ID is not related to the multiple point-to-point service subscribed by the mobile terminal, the mobile terminal continues to receive a previously received traffic channel before receiving the control information indication message. . Preferably, the traffic channel is one of a point-to-multiple point traffic channel and a point-to-point traffic channel. In accordance with one aspect of the present invention, the attribute information comprises at least one control information identifier associated with the at least one control information message, the update information associated with the at least one message. of control information, and timing information associated with the point-to-multiple point service. The update information indicates the update information of at least one control information message for the point-to-multiple service. The timing information indicates which part of the control channel from point to multiple points will be received by the mobile terminal. Also, the timing information indicates a starting point of the transmission of control channel from point to multiple points. Preferably, the network transmits the control channel from point to multiple points for a duration according to the timing information. Alternatively, the network stops the transmission of the control channel from point to multiple points at a termination time according to the timing information. According to another aspect of the present invention, a method for the mobile terminal that determines to receive the at least one control information message according to the attribute information, comprises verifying the control information identifier if the control information identifier is included in the attribute information and receiving the at least one control information message if the control information identifier is related to the mobile terminal. According to a further aspect of the present invention, a method for the mobile terminal that determines to receive the at least one control information message according to the attribute information, comprises verifying the update information if the update information is included in the attribute information, compare the update information for the previously stored update information, and receive the at least one control information message if update information has not previously been stored or if the update information is different from the update information stored previously.

According to another aspect of the present invention, a method for the mobile terminal that determines to receive the at least one control information message according to the attribute information, comprises verifying the timing information if the timing information is included. in the attribute information and receive at least one control information message according to a time interval indicated by the timing information. Preferably, the control information indication message is transmitted through an MTCH, the control information indication message is transmitted through an S-MCCH, the point-to-multiple point control channel is an MCCH, and the traffic channel is a MTCH. It should be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide a further explanation of the present invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings accompanying the present disclosure, which are included to provide a further understanding of the present invention and which are incorporated in and constitute a part of this specification, illustrate the embodiments of the present invention and together with the description serve to explain the principles of the present invention. The characteristics, elements and aspects of the present invention which are referred to by the same numbers in different figures, represent the same, equivalent or similar characteristics, elements or aspects according to one or more modalities. Figure 1 illustrates a network of the related art of a wireless communication system. Figure 2 illustrates a radio interface protocol architecture of the related art based on a radio access network specification between the UE and the UTRAN. Figure 3 illustrates the channel mapping of the related art for an MBMS service for a mobile terminal. Figure 4 illustrates a diagram for selectively transmitting and receiving control information for an MBMS service according to an embodiment of the present invention.

PREFERRED MODALITY OF THE INVENTION The present invention relates to a method for minimizing data loss as a mobile terminal unnecessarily reads an MCCH to receive MBMS control information in the course of receiving MBMS data. For this purpose, the present invention provides a method for constructing an MBMS control information reception indication message (MCCH indication message) and a method for receiving the MBMS control information using the same. Although the present invention is implemented in a mobile communication system, such as a UMTS developed under the 3GPP specifications, the present invention can also be applied to a communications system that operates in accordance with a different specification. According to a preferred embodiment of the present invention, an MCCH indication message comprises a service ID to identify which service is transmitted by the control information for an RRC message ID indicating which type of control information is transmitted. The MCCH indication message additionally comprises update information to indicate whether an MCCH indication message is currently transmitted or the currently transmitted control information (RRC message) through the MCCH is new information is updated again or is information previously transmitted. The MCCH indication message also includes timing information to indicate a time interval for receiving the MCCH. The MCCH indication message is preferably transmitted through the MTCH, which is being received by the mobile terminal or through the mapped S-MCCH for the SCCPCH transmitting the MTCH. The MCCH indication message may include at least one of the service ID, the RRC message ID, the update information and the timing information. The RRC message ID includes a login information to indicate the start of an MBMS service, a session end information to indicate the MBMS service term, an RB type indicato indicate which type of RB is provided by the MBMS using RB information to provide RB point information to multiple points, such as the MTCH if the RB type is an RB point to multiple points, count information to measure the number of terminals that wish to receive the MBMS service, and new count information to count again the number of terminals that want the MBMS service while the MBMS service is being provided. The update information is of a type of value label to inform the mobile terminal (UE) of the newest of a transmitted MCCH indication message or an RRC message. The update information can be divided into two types. A type is the update information related to an MCCH indication message. The other type is the update information related to an RRC message. Notably, the mobile terminal operates differently depending on the type of update information. If the update information is update information related to the MCCH indication message, the mobile terminal ss the update information of an MCCH indication message whenever the corresponding MCCH indication message is received. Additionally, when an MCCH indication message is received, the mobile terminal compares the received update information included in the MCCH indication message with the previously sd update information. If update information has not previously been sd or if the update information is different, the mobile terminal determines that the update information currently received is new information. However, if the two update information is the same, the mobile terminal determines that the update information currently received is the same as the update information sd previously. If the update information is update information related to the RRC message, the indication message MCCH comprises the RRC message ID and the update information. When the terminal receives the MCCH indication message, it stores the corresponding update information for each RRC message.

Additionally, if a new MCCH indication message is received, the terminal compares the received update information with respect to the RRC message ID and the previously stored update information. If update information has not been stored or if two update information is different, the mobile terminal determines that the update information currently received is new information.

However, if the two update information is the same, the mobile terminal determines that the update information currently received is the same as the update information stored previously. The timing information indicates the information related to a time interval for the mobile terminal to receive the MCCH. The time slot information may include at least one of an MCCH reception start time, a reception completion time and a reception time interval. The time slot information may be general timing information, frame information or slot information. If a service ID is included in the MCCH indication message, the mobile terminal verifies the service ID. If the service ID is not related to the mobile terminal or to a service that the mobile terminal is currently receiving or wishes to receive, the mobile terminal ignores the received MCCH indication message and continues to receive the MTCH. However, if the service ID corresponds to an MBMS service that is being received or is to be received, the mobile terminal receives the control information transmitted through the MCCH by changing the reception channel from the MTCH to the MCCH. If the RRC message ID is included in the MCCH indication message, the mobile terminal verifies the RRC message ID. The mobile terminal then changes the reception channel of the MTCH to the MCCH to specifically receive the control information indicated by the RRC message ID among all the control information transmitted through the MCCH. If the update information is included in the MCCH indication message, the mobile terminal checks whether the received indication message is a new message by comparing the received update information with the previously stored update information. If the received update information is the same as the previously stored update information, the mobile terminal determines that the received MCCH indication message is the same as the previously received MCCH indication message. Accordingly, the mobile terminal ignores the received MCCH indication message and continues to receive the MTCH. However, if update information has not previously been stored or if the received update information is different from the previously stored update information, the mobile terminal stores the received update information and receives the control information transmitted through the MCCH changing from the MTCH to the MCCH. Also, if the timing information is included in the MCCH indication message, the mobile terminal receives the MCCH by changing the reception channel of the MTCH to the MCCH during a time interval indicated by the received timing information. If the timing information includes a reception start time, the mobile terminal starts receiving the MCCH from the indicated start time. If the timing information includes a reception end time, the mobile terminal terminates the reception of the MCCH at the indicated end time. If the timing information includes a reception interval time, the mobile terminal receives the MCCH during the indicated time interval. Preferably, the MCCH indication message includes at least one of the service ID, the RCC message ID, the update information and the timing information. If at least one of these pieces of information is included in the MCCH indication message, the mobile terminal receives the control information by performing a separate operation for each piece of information as described above. For example, if the MCCH indication message includes the service ID and the RRC message ID, the mobile terminal checks the service ID. If the received service ID is not related to the mobile terminal, the terminal ignores the MCCH indication message and continues to receive the MTCH. However, if the received service ID is a service ID of an MBMS that is being received or wants to be received by the mobile terminal, the terminal changes from the MTCH to the MCCH to receive the control information transmitted through the MCCH. When the terminal receives the control information indicated by the RRC message ID among all the control information transmitted through the MCCH, the mobile terminal operates in accordance with the corresponding control information.

If the service ID and update information are included in the MCCH indication message, the terminal checks the service ID. If the received service ID is not related to the mobile terminal, the terminal ignores the received MCCH indication message and continues to receive the MTCH. However, if the received service ID is a service ID of an MBMS that is being received or that the mobile terminal wishes to receive, the terminal additionally checks the update information. If the received update information is the same as the previously stored update information, the terminal ignores the received MCCH indication message and continues to receive the MTCH. However, if there is no stored update information or if the update information stored in advance is different from the update information currently received, the terminal stores the received update information. The mobile terminal then receives the control information transmitted through the MCCH by changing from the MTCH to the MCCH. If the MCCH indication message includes the RRC message ID and the update information, the terminal checks whether the received MCCH indication message or the RRC message to be transmitted through the MCCH is a new message when compared to the update information. received with the update information stored previously. If the received update information is the same as the previously stored update information, the mobile terminal ignores the received MCCH indication message and continues to receive the MTCH. However, if there is no stored update information or if the previously stored update information is different from the currently received update information, the mobile terminal stores the received update information related to the MCCH indication message or the RRC message. The mobile terminal then switches from the MTCH to the MCCH to receive the control information transmitted through the MCCH. When the mobile terminal receives the control information indicated by the RRC message ID among all the control information transmitted through the MCCH, the terminal performs a tracking operation according to the corresponding control information. As described above, the present invention presents the case where the MCCH indication message includes two of the service ID, the RRC message ID and the update information. However, the present invention can be easily applied to the case where the MCCH indication message includes two or three of the service ID, the RRC message, the update information and the timing information, where the mobile terminal processes separately a corresponding operation with respect to each piece of information and receives control information accordingly. According to a preferred embodiment of the present invention, a method for selectively transmitting and receiving control information for an MBMS service is illustrated in Figure 4. As shown, although the mobile terminal (UE) 50 is provided with a First MBMS service (MBMS1), starts a second MBMS service (MBMS2). Accordingly, a UTRAN 100 informs the mobile terminal about a login of the second MBMS service. At this point, an MCCH indication message includes a service ID, a RRC message ID, update information and timing information. The terminal 50 receives the MBMS data 1 in a stratum L1 / L2 through an MTCH1 (step S10). An RRC of the terminal 50 receives the MCCH indication message through the MTCH1 or the S-MCCH in the course of receiving the MBMS1 data (step S11). At this point, the MCCH indication message is a control information reception indication message for the MBMS2. At this time, it was assumed that the service ID has a value of 2 and the RRC message ID indicates a login. Both the service ID and the RRC message ID are transmitted through the MCCH indication message. The terminal 50 checks the service ID and determines whether the MBMS2 service is a service that the mobile terminal 50 wishes to receive. If the MBMS2 is a service that the mobile terminal 50 wishes to receive, the terminal checks the update information to determine whether the Control information to be transmitted is new and if the MCCH will be received (step S12). If the MCCH is determined to be received, the RRC of terminal 50 instructs the lower layers, such as PHY / MAC / RLC (strata L1 / L2), to change the reception channel from the MTCH1 to the MCCH at a specified time. for the timing information (step S13). According to the RRC instruction of the terminal, the lower layers change the reception channel of the MTCH1 to the MCCH (step S14). Consequently, because the MTCH1 and the MCCH are mapped for a different SCCPCH, the physical channel is also changed. After which, the RRC terminal continuously receives an RRC message indicated by the RRC message ID through the MCCH (step S15). Preferably, the RRC terminal receives a login message from MBMS2. Upon receipt of the MBMS2 login information, the RRC terminal determines whether to receive continuously the new MBMS1 or MBMS2. In this case, a user is informed about the login of the MBMS2 and a continuation of operation is determined according to the user's decision (step S16). In this modality, it was assumed that the user wishes to receive the MBMS2. As the user determines to receive the new MBMS2, the RRC terminal instructs the lower layers, such as the PHY / MAC / RLC to change the reception channel of the MCCH to the MTCH2 (step S17). Accordingly, the lower layers change the receiving channel of the MCCH to the MTCH2 in such a way that the mobile terminal 50 (UE L1 / L2) can receive the MBMS2 data in the stratum L1 / L2 via the MTCH2.

As described, the method for transmitting and receiving control information for an MBMS service according to the present invention has many advantages. For example, if the terminal receives the control information reception indication message MBMS (MCCH indication message) in the course of receiving one or more MBMS services, the service ID, the RRC message ID and the information The update information included in the MBMS control information reception indication message are checked to determine whether to receive the MCCH. The mobile terminal is warned to unnecessarily receive the MCCH when the control information to be received through the MCCH has already been received by the end! mobile or when the control information to be received corresponds to a service not related to the mobile terminal. Therefore, a loss of MBMS data because the unnecessary reception of the MCCH can be reduced. In addition, the timing information is included and is transmitted in the MBMS control information reception indication message. This prevents the mobile terminal from receiving the MCCH for an unnecessarily long time. Accordingly, the loss of MBMS data is further reduced. Although the present invention was described in the context of mobile communications, the present invention can also be used in any wireless communication systems using mobile devices, such as PDAs and laptops equipped with wireless communication capabilities. In addition, the use of certain terms to describe the present invention, should not limit the scope of the present invention to a certain type of wireless communication system. The present invention can also be applied to other wireless communication systems using different aerial interfaces and / or physical layers, for example, TDMA, CDMA, FDMA, WCDMA, etc. Preferred embodiments may be implemented as a method, apparatus or article of manufacture using standard programming and / or engineering techniques to produce software, firmware, hardware or any combination thereof. The term "article of manufacture" as used in the present description refers to a code or logic implemented in hardware logic (e.g., an integrated circuit microprocessor, programmable field gate array (FPGA), integrated circuit application specific (ASIC), etc.) or a computer-readable medium (eg, magnetic storage media (eg, hard drive controllers, floppy disks, tape, etc.), optical storage (CD-ROMs, optical discs, etc.), volatile and non-volatile memory devices (eg, EEPROMs, ROMs, PROMs, RAMs, DRAMs, SRAMs, firmware, programmable logic, etc.). The code in the computer readable medium is accessed and executed by a processor The code in which the preferred embodiments are implemented can additionally be accessed through a transmission medium or from a file server over a network. The manufacturing in which the code is implemented may comprise a transmission medium, such as a network transmission line, wireless transmission means, propagation signals through space, radio waves, infrared signals, etc. Of course, those skilled in the art will recognize that many modifications can be made to this configuration without departing from the scope of the present invention, and that the article of manufacture may comprise any information carried by a means known in the art. The foregoing modalities and advantages are exemplary only and will not be construed as limiting the present invention. The present teaching can easily be applied to other types of apparatus. The description of the present invention is intended to be illustrative, and not to limit the scope of the Claims. Many alternatives, modifications, and variations will be evident to those experts in the field. In the Claims, the media clauses plus functions are intended to encompass the structure described in the present description as the function explained is performed and not only structural equivalents, but also equivalent structures.

Claims (43)

1. NOVELTY OF THE INVENTION CLAIMS 1. - A method for receiving multiple point-to-point service in a wireless communication system, characterized in that the method comprises: receiving a control information indication message for a multiple point-to-point service, having the information indication message of control attribute information to receive at least one control information message from a point-to-multiple point control channel, wherein the control information indication message and the at least one control information message are messages from point to multiple points created from the same protocol layer; determining to receive the at least one control information message according to the attribute information; and receiving the at least one control information message through the point-to-multiple control channel if a mobile terminal determines to receive the at least one control information message.
2. 2. The method according to claim 1, further characterized in that if the mobile terminal determines not to receive the at least one control information message, the mobile terminal does not receive the at least one control information message. 3. - The method according to claim 1, further characterized in that the step of determining to receive the at least one control information message according to the attribute information comprises: verifying an update of at least one control information message for the point-to-multiple point service subscribed by the mobile terminal based on the control information indication message; and determining to receive the at least one control information message if the at least one control information message is updated. 4. The method according to claim 1, further characterized in that it further comprises changing from a previously received traffic channel to a point control channel to multiple points to receive the control information message. 5. The method according to claim 4, further characterized in that it further comprises changing from a traffic channel received in advance to the control channel from point to multiple points when determining to receive the at least one control information message. 6. The method according to claim 1, further characterized in that it further comprises: processing the at least one control information message; and changing from a control channel from point to multiple points to a traffic channel to receive the service from point to multiple points. 7. - The method according to claim 1, further characterized in that the attribute information comprises a multiple point-to-point service ID associated with the point-to-multiple point service. 8. The method according to claim 7, further characterized in that the step for determining to receive the at least one control information message according to the attribute information comprises: verifying the service ID from point to multiple points if the point-to-point multiple service ID is included in the attribute information; and determining which control information message will be received from the point-to-point control channel if the point-to-point service ID is related to a multiple point-to-point service subscribed by the mobile terminal. 9. The method according to claim 8, further characterized in that if the multiple point-to-point service ID is not related to the multiple point-to-point service subscribed by the mobile terminal, the mobile terminal continues to receive one channel. received prior to receiving the control information indication message. 10. The method according to claim 9, further characterized in that the traffic channel is one of a point-to-point traffic channel and a point-to-point traffic channel. 11. - The method according to claim 1, further characterized in that the attribute information comprises at least one of: a control information identifier associated with the at least one control information message; update information associated with the at least one control information message; and timing information associated with the point-to-multiple point service. 12. The method according to claim 11, further characterized in that the update information indicates the update information of the at least one control information message for the point-to-multiple point service. 13. The method according to claim 11, further characterized in that the timing information indicates which part of the control channel from point to multiple points will be received. 14. The method according to claim 11, further characterized in that the timing information indicates a start time of the reception of control channel from point to multiple points. 15. The method according to claim 11, further characterized in that the mobile terminal receives the control channel from point to multiple points for a duration according to the timing information. 16. The method according to claim 11, further characterized in that the mobile terminal stops the reception of the control channel from point to multiple points in a termination time according to the timing information. 17. The method according to claim 11, further characterized in that it further comprises: verifying the control information identifier if the control information identifier is included in the attribute information; and receiving the at least one control information message if the control information identifier is related to the mobile terminal. 18. The method according to claim 11, further characterized in that it further comprises: verifying the update information if the update information is included in the attribute information; compare the update information with the update information stored previously; and receiving the at least one control information message if update information has not previously been stored or if the update information is different from the previously stored update information. 19. The method according to claim 11, further characterized in that it additionally comprises: checking the timing information if the timing information is included in the attribute information; and receiving the at least one control information message according to a time interval indicated by the timing information. 20. - The method according to claim 1, further characterized in that the indication message of the control information is received through an MTCH. 21. The method according to claim 1, further characterized in that the control information indication message is received through an S-MCCH. 22. The method according to claim 1, further characterized in that the point-to-multiple point control channel is an MCCH. 23. The method according to claim 6, further characterized in that the traffic channel is an MTCH. 24. A method for transmitting a point-to-multiple service in a wireless communication system, characterized in that the method comprises: transmitting a control information indication message for a point-to-multiple point service to a terminate! mobile, the control information indication message having attribute information to transmit at least one control information message through a point-to-multiple point control channel, wherein the control information indication message and the at least one control information message is multiple point-to-point messages created from the same protocol layer; and transmitting the at least one control information message through the control channel from point to multiple points. 25. - The method according to claim 24, further characterized in that the mobile terminal that determines to receive the at least one control information message, comprises: verifying an update of the at least one control information message for the point service to multiple points subscribed by the mobile terminal based on the control information indication message; and determining to receive the at least one control information message if the at least one control information message is updated. 26. The method according to claim 24, further characterized in that the mobile terminal determines to receive the at least one control information message according to the attribute information. 27. The method according to claim 26, further characterized in that the attribute information comprises a multiple point-to-point service ID associated with the point-to-multiple point service. The method according to claim 27, further characterized in that a method for the mobile terminal that determines to receive the at least one control information message according to the attribute information comprises: verifying the service ID from point to multiple points if the point-to-multiple point service ID is included in the attribute information; and determining which control information message will be received from the point-to-point control channel if the point-to-point service ID is related to a multiple point-to-point service subscribed by the mobile terminal. 29. The method according to claim 28, further characterized in that if the multiple point-to-point service ID is not related to the multiple point-to-point service subscribed by the mobile terminal, the mobile terminal continues to receive a second-point channel. traffic previously received before receiving the control information indication message. The method according to claim 29, further characterized in that the traffic channel is one of a point-to-multiple point traffic channel and a point-to-point traffic channel. The method according to claim 24, further characterized in that the attribute information comprises at least one of: a control information identifier associated with the at least one control information message; update information associated with the at least one control information message, and timing information associated with the point-to-multiple point service. 32. The method according to claim 31, further characterized in that the update information indicates the update information of the at least one control information message for the point-to-multiple point service. 33. - The method according to claim 31, further characterized in that the timing information indicates which part of the control channel from point to multiple points will be received by the mobile terminal. 34.- The method according to claim 31, further characterized in that the timing information indicates a start time of the transmission of control channel from point to multiple points. The method according to claim 31, further characterized in that the network transmits the control channel from point to multiple points for a duration according to the timing information. 36. The method according to claim 31, further characterized in that the network stops the transmission of the control channel from point to multiple points in a time of completion according to the timing information. The method according to claim 31, further characterized in that a method for a mobile terminal to determine to receive the at least one control information message according to the attribute information comprises: verifying the control information identifier if the control information identifier is included in the attribute information; and receiving the at least one control information message if the control information identifier is related to the mobile terminal. 38. - The method according to claim 31, further characterized in that a method for the mobile terminal to determine receiving the at least one control information message according to the attribute information comprises: verifying the update information if the information of update is included in the attribute information; compare the update information with the update information stored previously; and receiving the at least one control information message if update information has not previously been stored or if the update information is different from the previously stored update information. 39.- The method according to claim 31, further characterized in that a method for the mobile terminal to determine receiving the at least one control information message according to the attribute information comprises: verifying the timing information if the Timing information is included in the attribute information; and receiving the at least one control information message according to a time interval indicated by the timing information. The method according to claim 24, further characterized in that the control information indication message is transmitted through an MTCH. 41. The method according to claim 24, further characterized in that the control information indication message is transmitted through an S-MCCH. 42. - The method according to claim 24, further characterized in that the point-to-multiple point control channel is an MCCH. 43.- The method according to claim 29, further characterized in that the traffic channel is an MTCH.