KR20050014599A - Method for efficiently paging an user equipment to transmit control information in a mobile communication system - Google Patents

Abstract

PURPOSE: A method for effectively calling a user terminal to transmit control information in a mobile communication system is provided to send control information in accordance with an MBMS(Multimedia Broadcast/Multicast Service) support, thereby saving a battery of an UE. CONSTITUTION: Sections(401) show that a UE turns off a receiver in order to save a battery power. The UE confirms whether control information on an MBMS exists or whether control information on other services except the MBMS exists through POs(Paging Occasions)(402). The UE confirms a PI(Paging Instance) transmitted to an unused part of a PICH(Paging Indicator Channel) received from a specific paging PO, and confirms whether the control information on the MBMS exists while confirming other parts of the PICH to decide whether the control information on the other services including a voice service exists.

Description

METHODOLOGY FOR EFFICIENTLY PAGING AN USER EQUIPMENT TO TRANSMIT CONTROL INFORMATION IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to a multimedia broadcast / multicast service (hereinafter, referred to as 'MBMS') in a mobile communication system, which efficiently calls a user terminal to transmit control information according to the MBMS service support. It is about a method.

Today, due to the development of communication technology, the service provided by the Code Division Multiple Access (CDMA) mobile communication system is not only a conventional voice service but also a packet service communication that transmits a large amount of data such as packet data and circuit data. It is also developing and developing into multimedia broadcasting / communication capable of transmitting multimedia services. Accordingly, in order to support the multimedia broadcasting / communication, an MBMS service that provides a service to a plurality of user terminals (hereinafter referred to as "UE") from one or several multimedia data sources has been discussed. The MBMS service supports multimedia transmission forms such as real-time video, audio, still images, text, etc., and can provide audio data and video data simultaneously according to the application of the multimedia transmission format. do. In addition, the MBMS service may be serviced through a broadcast channel in that there may be a plurality of UEs for the same service.

The MBMS service is a point-to-point (PTP) service that provides each subscriber with an MBMS service desired by the subscriber, and the same MBMS service required by the plurality of subscribers to a plurality of subscribers. Point-to-multi-point (PTM) services that serve data are available. In this case, the MBMS service can be changed to PTM and then serviced to PTM for each cell according to the number of UEs that want to receive the MBMS service for one MBMS service or the transmission power of the network according to the support of the MBMS service. Do. Or vice versa, each cell can be served by PTM and then by PTP.

Next, a structure of an asynchronous mobile communication system for supporting the MBMS service will be described with reference to FIG. 1.

1 is a diagram illustrating a structure for providing the multimedia MBMS service to a general asynchronous mobile communication system.

Referring to FIG. 1, a serving packet radio belonging to a UE 101, a UMTS Terrestrial Radio Access Network (hereinafter referred to as "UTRAN", 102), and a core network (hereinafter referred to as "CN") are radios. Serving General Packet Radio Service Support Node (hereinafter referred to as "SGSN", 103), Home Location Register (hereinafter referred to as "HLR", 104), Gateway Packet Radio Service Support Node (Gateway General Packet) Radio Service Support Node (hereinafter referred to as "GGSN", 105), Broadcast / Multicast Service Center (hereinafter referred to as "BM-SC", 106), and Content Provider (Contents Provider, 107) do.

The role of each of the MBMS service components shown in FIG. 1 is shown in Table 1 below.

The structure of each communication network supporting the MBMS service illustrated in FIG. 1, for example, UTRAN, will be described in more detail with reference to FIG. 2 below.

FIG. 2 is a diagram schematically illustrating a wireless access network (UTRAN) for providing a general multimedia broadcasting / multicasting service.

Referring to FIG. 2, the UE 130 directly plays a corresponding MBMS service to each user terminal and has hardware or software that supports the MBMS service. UTRAN is a wireless communication network that serves to connect the UE (130) and the CN (100). The UTRAN is composed of a plurality of Radio Network System (hereinafter referred to as RNS, 110, 120), the RNS is a plurality of Radio Network Controller (hereinafter referred to as RNC, 111, 112), the RNC It is composed of a base station apparatus (hereinafter referred to as 'node B') and a plurality of cells belonging to the node B (115, 113, 114, 116) under the control of (111, 112).

The RNS 110 includes a plurality of node B 115 and node B 113 under the control of the RNC 111, and a plurality of cells under the control of the respective node B 115 and 113. The RNS 120 includes a plurality of node B 114 and node B 116 under the control of the RNC 112, and a plurality of cells under the control of the respective node B 114 and 116. The total number of node Bs controlled by the respective RNCs 111 and 112 and the total number of cells belonging to each node B may be determined by the performance of the service provider, the RNC, and the node B. The UE 130 and the UTRANs 110 and 120 are connected to the Uu interface 121, and the Uu interface 121 is a term used in 3GPP and refers to an interface between the UE and the UTRAN. The UTRANs 110 and 120 are connected to the CN 100 via an Iu 122 interface. The Iu interface 122 is a term used in 3GPP to refer to the interface between the UTRAN (110, 120) and the components in the CN (100). The interface of the components of the UTRAN is shown in Table 2. These are the interfaces that are standardized in 3GPP.

Description of each role of the components shown in Table 1 may vary slightly depending on the network operator, but the basic role is as shown in Table 1. In addition, although not shown in FIG. 1, a Cell Broadcast Center (hereinafter referred to as CBC) may be added to FIG. 1 in order to provide UE with advance information on an MBMS service currently being serviced. In addition, the name of each interface described in Table 2 used the name currently defined in 3GPP. The name may be changed. In order to clarify the contents to be described in the present invention, the detailed structure of the upper layer of the UTRAN currently defined in 3GPP and channels between each layer will be shown in FIG. 3.

3 is a diagram schematically showing the structure of the UTRAN protocol.

Referring to FIG. 3, the messages of the upper layer processed in the UTRAN can be largely classified into control signals and user data.

In FIG. 3, control space (hereinafter referred to as "C-Plain") 301 signaling and user space (hereinafter referred to as "U-Plain", 302) data are represented. The C-Plain signaling 301 and the U-Plain data 302 are messages of a Non Access Stratum (hereinafter referred to as "NAS"), where the NAS messages are not used for a wireless connection between the UE and the UTRAN. Messages that do not need to know the contents of the UTRAN. Unlike the NAS, a message used directly for a wireless connection between the UTRAN and the UE is called an access stratum (hereinafter referred to as an "AS") message, and the 303 Radio Resource Control (hereinafter referred to as "RRC") of FIG. Refers to data or control signals used below.

The RRC 303 is a physical layer (hereinafter referred to as "L1") related to the connection between the UE 130 and the UTRAN 110, and a medium access control (Medium Access Control: hereinafter "L2 / MAC") of layer 2. "", Radio Link Control (hereinafter referred to as L2 / RLC), Packet Data Convergency Protocol (hereinafter referred to as L2 / PDCP), Broadcast / Multicast Control By controlling the following "L2 / BMC", it controls all the things involved in the connection between the UE and the UTRAN such as physical call setup, logical call setup, control information transmission and reception, measurement data transmission and the like between the UE and the UTRAN. .

The L2 / PDCP 304 receives data to be transmitted from the NAS layer and transmits the data to the L2 / RLC 306 using an appropriate protocol. The L2 / BMC 305 receives data necessary for broadcasting and multicasting from the NAS layer and transmits the data to the L2 / RLC 306 using an appropriate protocol.

The L2 / RLC 306 receives a control message transmitted from the RRC 303 to the UE 130, and takes into account the characteristics of the control message in RLC # 1 361 and RLC # n 362. To the L2 / MAC 308 using a logical channel 307 and receive data from the L2 / PDCP 304 and the L2 / BMC 305 to receive the RLC # I '(363). ) And RLC # n '364 into the appropriate form and transmit to L2 / MAC 308 using Logical Channel 307. The occurrence of multiple RLCs in the L2 / RLC unit 306 is determined by the number of radio links between the UE and the UTRAN.

The logical channel 307 is largely a dedicated type depending on whether it is for a specific UE 130 or a few specific UEs, a common type according to whether a plurality of UEs are used, and if the message is control related data, ) Type, if the message is traffic related data, it is divided into traffic type. Types and roles of the 307 logical channels used in 3GPP are shown in Table 3 below.

The L2 / MAC 308 of FIG. 3 manages radio resources between the UE 130 and the UTRAN 110, 120 of FIG. 2 under the control of the RRC 303, and controls the UE 130 and the UTRAN 110. 120 manages connections between the L2 / RLC 306 and logical channels from the L2 / RLC 306, maps them to the transport channels 309, and transmits them to the L1 310. The type and role of the transport channel 309 are described in Table 4 below.

In addition to the trend channel described in Table 4, there are transport channels such as an uplink shared channel and a common packet channel, but are not related to the present invention, and thus description thereof will be omitted. .

The transport channels 309 transmitted to the L1 310 of FIG. 3 correspond to actual physical channels through appropriate processes and are transmitted to the UE 130 or the UTRAN 110, 120. The physical channels include a first common control physical channel (hereinafter referred to as P-CCPCH) for transmitting a broadcast channel (BCH), a paging channel (hereinafter referred to as a PCH), and a forward access channel (FACH). : Second Common Control Synchronization Channel (hereinafter referred to as FACH), Paging Indicator Channel (hereinafter referred to as PICH), Acquisition Indicator Channel (Acquisition Indicator Channel), Physical Common Packet Channel (Physical Common Packet Channels).

In FIG. 1, an example of supporting the MBMS service in the 3GPP standard is shown. In FIGS. 2 and 3, the structure of the UTRAN, the structures and functions of L1, L2, and L3 of the UTRAN are shown. Based on the contents described with reference to FIGS. 1, 2, and 3, a process of performing any MBMS service is as described below.

In order to provide any MBMS service, basic information about the MBMS service and service guide information are first transmitted from the UTRAN 110 and 120 to the UEs 101. Upon receiving the basic information and the guide for the MBMS service, the UEs 101 register with the CN 100 when they want to receive the MBMS service. This is called a service participation process (hereinafter referred to as "joining"). The roster of the registered UE 130 must then be forwarded to the elements of the CN for which the roster of the UE 130 is needed (e.g., BM-SC 106, SGSN 103 and RNC 111). do. When each of the CN 100 receives a list of UEs that want to receive the random MBMS service, the CN 100 and the UTRAN 110 and 120 connected to the CN 100 receive the UE 130. It is necessary to set up a radio bearer (Radio Bearer) for providing the MBMS service by paging (). Accordingly, the CN provides the MBMS service to the corresponding UE through the established radio bearer. On the other hand, when the MBMS service is terminated, the termination fact should be notified to all UEs, and thus, when all the UEs, the central network in charge of the UEs, and UTRAN release all resources allocated for the MBMS service, Any MBMS service is terminated.

Referring to the above description, it can be divided into UTRAN (Paging method) to provide MBMS service.

The common calling method is to call any UE using a common channel, and the dedicated calling method is to call any UE using a dedicated channel. Whether the common calling method and the dedicated calling method is applied is determined by the state of the called UE.

Referring to the state of the UE, in 3GPP, the UE is largely divided into an idle mode (hereinafter referred to as "idle mode") and a connected mode (hereinafter referred to as "connected mode"). The connected mode is classified into four states according to the type of the downlink channel that the UE can receive, the quality of service (QoS), and the type of the uplink channel that the UE can transmit. The four states are URA-PCH (UTRAN Register Area Paging Channel) and CELL_PCH, CELL_FACH, and CELL_DCH. Accordingly, the state of the UE in 3GPP can be largely five including the idle mode.

The states of the UE in which the common calling method is used are IDLE state, the CELL_PCH state, and the URA_PCH state, and the states of the UE in which the dedicated calling method is used are the CELL_FACH and CELL_DCH states. A description of the states of the five UEs is as follows.

(1) CELL-DCH state: A UE in CELL-DCH state transmits up and down with UTRAN / CN using DCH transmitted through DPCH, and does not receive or transmit other common channels other than the DCH. However, if a special function is used, the FACH can be received in addition to the DCH. The call to the UE in CELL DCH state uses a call message sent to the DCH.

(2) CELL_FACH state: Downlink data reception is FACH, and uplink data transmission is RACH. The UE confirms whether or not the FACH allocated to the UE is transmitted by continuously receiving the S-CCPCH, and if there is data to be transmitted upward, the UE transmits data to the RACH through a channel acquisition procedure. In the call to the UE in the CELL FACH state, the call message transmitted in the DCH is used similarly to the UE in the CELL DCH state.

(3) CELL_PCH state: A UE in CELL_PCH state monitors a paging indicator channel (PICH: PICH), and is referred to as a forward access channel (FACH). Information about other channels PICH, such as), is included in a system information block (SIB) of the 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 first half of the CN (100) to call any UE 130, the CN calls the UE uses the DRX scheme to minimize the power consumption of the UE. The DRX scheme refers to a scheme in which a UE sets a time point for turning on a receiver in advance with CN to receive a paging message, and receives a call message only at the set time point. Thus, the UE turns on the receiver only at a predetermined time point with the CN by using the DRX scheme, and minimizes power consumption by turning off the receiver at other time points other than the predetermined time point. If this is explained in more detail as follows. The UE receives a PICH signal at a call point (PO: paging occasion, hereinafter referred to as "PO"), and indicates a corresponding call indication (PI: Paging Instance, hereinafter "PI") of the received PICH signal. If is set to "1", receive the call message transmitted through PCH.

The general dedicated calling process is to transmit a call message via the downlink DPCH when it is necessary to call the UE in UTRAN / CN, so that the UE does not need to receive another common channel. In this regard, in the single call method, whether there is control information related to the MBMS service in accordance with the reception time of UEs receiving signals according to the UTRAN DRX cycle and the CN DRX cycle described in the general common calling process described above. The PI for MBMS service that informs is transmitted to the unused area of the PICH. The PICH used in 3GPP can transmit 300 bits for a 10 ms unit time, and uses 288 bits for a general call and does not use 12 bits. Thus, the single call method sends a PI for MBMS service to the unused area. The advantage of the single calling method is that UEs do not use separate DRX for MBMS service, so that UEs do not need to operate the receiver multiple times to confirm transmission of control information for MBMS service. While confirming the call of the information, the 12-bit unused area of the PICH can be received to confirm the call of the control information for the MBMS service. The disadvantage of the single calling method is that the UE for receiving the same MBMS service has a different DRX cycle, so that the PI for the MBMS service must be repeatedly transmitted for a very long time, and the DRX cycle of the UE to receive the MBMS service is very long. If it has a long value, a call to the control information of the MBMS service may not be made at an appropriate time.

On the other hand, the multiple call method is a method of newly defining and using the DRX cycle and PICH for MBMS service in addition to the DRX cycle and PICH used in the common common calling method. An advantage of the multiple call method is that the DRX cycle and the PICH for the MBMS service are newly defined, so that the UEs to receive the MBMS service can be notified of the existence of control information when necessary in the upper network. Disadvantages may be a waste of downlink radio resources because the separate MBMS service DRX cycle and PICH is used, and the terminal has to turn on the receiver separately in order to know the presence or absence of MBMS service control information.

Accordingly, an object of the present invention for solving the above problems is to provide an efficient calling method for transmitting control information of the MBMS service in a mobile communication system providing an MBMS service.

It is still another object of the present invention to provide a method of using a three-step method of an unused portion of a PICH, a PCH, and an MBMS Control Channel (MCCH) in providing a calling method of a mobile communication system providing the MBMS service.

Another object of the present invention is to provide a calling method combining a single calling method and a plurality of calling methods in providing a calling method of a mobile communication system providing the MBMS service.

Another object of the present invention is to provide a method of giving a MBMS service DRX cycle in a joining step of a UE in the calling method proposed in the present invention.

Another object of the present invention is to provide a method for broadcasting MBMS service DRX cycle to UEs in a cell in the calling method proposed in the present invention.

It is still another object of the present invention to provide a method of calling a mobile communication system providing the MBMS service. In communication from RNC to node B, a data frame for transmitting MBMS service call information modified from a conventional PICH transmission frame is provided. An apparatus and method for use are provided.

Still another object of the present invention is to provide an apparatus and method for using a new control frame in communication from a RNC to a node B in providing a method of calling a mobile communication system providing the MBMS service.

According to a first embodiment of the present invention for solving the above problems, in a method of calling a user terminal to transmit and receive control information for supporting the MBMS service in a mobile communication system supporting an MBMS service, SGSN Receiving a specific MBMS service request from the user terminal, transmitting a transmission cycle for transmitting call information related to the specific MBMS service and offset information for indicating a transmission start position to the RNC, and the RNC sends the specific MBMS service Transmitting the specific MBMS service notification notification message to the user terminal including a transmission period for transmitting call information related to the call information and offset information for indicating a transmission start position thereof, and the user terminal sends the specific MBMS service notification notification message to the user terminal. To correspond to the offset information At the determined call time is characterized in that it comprises the step of repeatedly confirmed in response to the PICH according to the specific MBMS service supports the transmission period.

A second embodiment of the present invention for solving the above problems is a method for calling a user terminal to transmit and receive control information for supporting the MBMS service in a mobile communication system supporting an MBMS service, Receiving a request for a specific MBMS service from a terminal, SGSN transmitting to the RNC offset information for indicating a transmission period for transmitting call information related to the specific MBMS service and a transmission start position thereof, and the RNC sends the specific MBMS service; Transmitting to the user terminal through a broadcast channel for transmitting the MBMS service system information, including a transmission period for transmitting call information related to the transmission information and offset information for indicating a transmission start position thereof; And a call time determined according to the offset information It standing the repeatedly PICH according to a particular MBMS service support is characterized in that it comprises the step of confirmation.

According to a third embodiment of the present invention for solving the above problems, in a method of calling a user terminal to transmit and receive control information for supporting the MBMS service in a mobile communication system supporting an MBMS service, SGSN When receiving a request for a specific MBMS service from the user terminal, transmitting to the RNC offset information for indicating a transmission cycle for transmitting call information related to the specific MBMS service and a transmission start position thereof, and the RNC sends the specific MBMS service to the specific MBMS service. Transmitting to the user terminal through an MBMS service control channel in accordance with the MBMS service support, including a transmission period for transmitting call information related to a service and an offset information for indicating a transmission start position thereof; Call determined according to period and said offset information And in that it characterized in that it comprises a step of determining repeatedly the PICH according to the specific MBMS service supported.

1 is a diagram illustrating a structure of a mobile communication system that provides a multimedia broadcasting / multicasting service.

FIG. 2 is a diagram schematically illustrating a wireless access network (UTRAN) providing multimedia broadcasting / multicasting services. FIG.

3 schematically illustrates the structure of a UTRAN protocol;

4 is a diagram schematically illustrating a method of calling a user terminal to transmit control information according to the present invention.

FIG. 5 is a diagram illustrating a process of transmitting a parameter related to an MBMS dedicated service PO in a join step according to the first embodiment of the present invention. FIG.

6 is a diagram illustrating a process of transmitting a parameter related to an MBMS dedicated PO using a broadcast channel / MBMS control channel according to a second embodiment of the present invention.

7 is a diagram showing the structure of a data frame between the RNC and node B for the calling method proposed in the present invention.

8 is a diagram illustrating a structure of a control frame between an RNC and a node B for a call method proposed in the present invention.

9 is a flowchart showing the operation of the CN according to the first embodiment of the present invention.

10 is a flowchart showing the operation of the UTRAN according to the first embodiment of the present invention.

11 is a flowchart illustrating operation of a UE according to the first embodiment of the present invention.

12 is a flowchart showing the operation of the CN according to the second embodiment of the present invention.

13 is a flowchart illustrating operation of a UTRAN according to a second embodiment of the present invention.

14 is a flowchart illustrating operation of a UE according to a second embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the following description, two representative embodiments of the present invention will be presented. In addition, the messages and signaling stipulating that the 3GPP standard is defined in the description of the present invention are described in detail in the 3GPP standard 25.331 standard.

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.

The present invention proposes a calling method capable of efficiently calling a plurality of terminals according to the needs of CN / UTRAN in a mobile communication system providing an MBMS service, and a calling method that minimizes power consumption of the terminal.

In this regard, the calling method of the present invention may be applied preferentially to UEs in which the UE is in IDLE, URA_PCH, and CELL_PCH states, but may also be applied to UEs in CELL_FACH and CELL_DCH states according to the capability of the UE.

The process of servicing the MBMS service is as follows.

1. MBMS service announcement broadcast: the process of guiding the MBMS service to be serviced

2. Response to MBMS service announcement and subscription to the MBMS service: a process in which the UE expresses its intention to receive the MBMS service to a higher network

3. Response to the request of the UE: a process of transmitting a response to the suitability of the UE whether the MBMS service reception and, if appropriate, information necessary for receiving the MBMS service.

4. MBMS service session start (hereinafter referred to as "Session start"): Session (Session start) is a transmission unit of MBMS service data, the length may vary for each MBMS service. That is, in the view of CN, MBMS Session start means that the transmission of MBMS service data is started from the BM-SC, and in the view of UTRAN, the MBMS service starts soon. .

5. MBMS service wired resource allocation: Resource allocation process between CN and UTRAN for transmitting MBMS service data

6. Service notification (Notification) process: UTRAN to inform the UEs that will receive the MBMS service will soon start MBMS service, and may include the process of obtaining the necessary information when the UE receives the MBMS service. have.

7. MBMS service radio resource allocation: a process of allocating a radio resource for transmitting the MBMS service and a process of delivering information on the radio resource to the UE

8. MBMS service data transmission: The process of transmitting the actual MBMS service to the UE.

The description of the MBMS service process will be briefly described only important processes, and other processes other than the above processes will be omitted because they are not related to the description of the present invention. As described in the MBMS service process, UEs to receive the MBMS service related to the session start need only receive whether the MBMS service is started before the session start. That is, information to inform the UEs in CN / UTRAN before Session start is whether the UE has started the MBMS service requested. After the CN / UTRAN informs the session start (notification in UTRAN / UE) whether to start the requested MBMS service, the CN / UTRAN should inform channel information and control information related to the MBMS service. Therefore, the amount of control information to be transmitted to the UEs based on the session start and the number of transmissions of the control information may vary.

In the present invention, before the session start message, the CN / UTRAN uses a calling method for notifying the existence of control information for the MBMS service by using the PO that the UE has for the non-MBMS service. It is proposed to use a calling method that notifies the existence of control information for the MBMS service by further using a PO for the MBMS service that the UE intends to receive.

4 is a diagram schematically illustrating a method of calling a user terminal to transmit control information according to the present invention.

401 of FIG. 4 is a section in which the UE turns off the power of the receiver to save the battery. As the length thereof increases, the UE may have an effect on battery saving. 402 of FIG. 4 is a PO originally owned by the UE, through which the UE checks whether there is control information of an MBMS service and whether there is control information for services other than the MBMS service. In the present invention, the PO is referred to as a UE specific PO (UE Specific Paging Occasion). The UE checks the PI transmitted to the unused part of the PICH received from the UE-dedicated PO, confirms the existence of control information for the MBMS service, and simultaneously checks other parts of the PICH to determine other parts such as voice services. Check the existence of control information for the service.

It is not possible to know whether the control information for the MBMS service exists in all the POs of the 402 UE dedicated PO of FIG. 4, and the control information for the MBMS service exists only in a few POs among the 402 UE dedicated POs. The PI is sent to know whether it is. A method of knowing a PO capable of knowing whether control information for MBMS service is present among the UE-dedicated POs may be described as follows based on the description of the general calling method described in the prior art. In addition, the CN and the UTRAN may determine how to determine the location of the PO to know the presence or absence of control information for the MBMS service, but the description of the present invention assumes that the PO is determined by SGSN for ease of description. .

The SGSN 103 determines the offset information for informing the PCH transmission cycle and the transmission start position in units of MBMS services 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 MBMS service is allocated the first time it is created, and is allocated and 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. 5, a detailed description thereof will be omitted.

In this case, when the PON having the transmission period PAGING_INTERVAL determined by the SGSN 103 and the offset information OFFSET is calculated from among the 402 UE-dedicated POs, the presence of control information of the MBMS service is calculated, Equation 1 is obtained.

[Equation 1, n = 1, 2, 3, ..., the SFN (PO) should be less than 4095 (SFN (PO) <4095), TMGI_K is TMGI div K (TMGI_K = TMGI div K ), And 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 between 0 and 4095, and is frame timing information counted by Node B. 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 indicates the number of S-CCPCH / PCHs that are set up in the corresponding cell. 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 PO capable of knowing whether MBMS service control information is present among the 402 UE-dedicated POs is a set of SFNs repeated every MBMS service 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.

410 of FIG. 4 indicates a time point at which the UE receives a notification message having a meaning of session start from the UTRAN. In this regard, the 405 PO of FIG. 4 represents control information according to MBMS service as a paging occsion to be additionally used by the UE after the 410 time point, and is referred to as MBMS Specific Paging Occasion (MBMS dedicated PO). It is called. The purpose of the MBMS dedicated PO is to conform with the UE dedicated PO to quickly deliver control information of the MBMS service. That is, even though UEs receiving the same MBMS service have different 402 UE-dedicated POs, in order to prevent CN / UTRAN from quickly delivering control information for the MBMS service, the PO for the MBMS service is independent. It is made with. Accordingly, the UE may use the 402 UE dedicated PO and the 405 MBMS dedicated PO to determine whether the control information for the MBMS service exists, and thus, the UE may quickly know whether the control information for the MBMS service exists.

The advantage of the calling method presented in the present method is that when the number of control information for the MBMS service is small, it is possible to see the battery saving effect of the UE by using one PO originally owned by the UE, and the number of control information for the MBMS service In many cases, the control information for the MBMS service can be quickly delivered using a PO defined independently for the MBMS service.

The present invention provides two embodiments of a method for transmitting parameters for calculating the 405 MBMS dedicated PO. In the first embodiment, when a UE requests a subscription for a specific MBMS service, the UE sends a dislike to the response message. In addition, the second embodiment is a broadcast channel (hereinafter referred to as BCH) for transmitting the system information or MCCH (MBMS control channel: hereinafter referred to as MCCH) for transmitting control information of the MBMS service UE in the cell This is how you tell them. The difference between the second embodiment and the first embodiment is that since the value of the 405 MBMS service-dedicated PO may be different for each cell, when the UE moves to another cell, information about the 405 MBMS service-dedicated PO can be quickly obtained. That is, the mobility of the UE can be guaranteed.

5 is a diagram illustrating a signaling flow between CN, UTRAN, and UE for the first embodiment presented in the present invention. Before explaining FIG. 5, it will be assumed that the network structure, BM-SC, GGSN, SGSN, RNC, and UE connection structure to be described below have the same structure as described with reference to FIG. do.

Referring to FIG. 5, the CN includes basic information about currently available MBMS services, for example, menu information. Accordingly, the CN performs a service announcement (SERVICE ANNOUNCEMENT) process to guide the MBMS service to UEs that are the MBMS service subscribers (step 501). Here, the menu information is information indicating time information and duration time at which a specific MBMS service is started, and the CN broadcasts the menu information to a predetermined service area or a cell broadcast service. Broadcast through a broadcast service such as (Cell Broadcast Service, hereinafter referred to as "CBS"). Alternatively, it may be transmitted only to UEs having the MBMS service request. The CN informs the MBMS Service ID of each MBMS service through the menu information. Here, the CN is defined as a concept encompassing the BM-SC, GGSN, and SGSN.

The UE, which has obtained basic information on the provided MBMS services through the service guide process, may receive a first MBMS service activation request (MBMS SERVICE ACTIVATION REQUEST 1) message for a specific MBMS service to be received among the MBMS services. Hereinafter, the " MBMS SERVICE ACTIVATION REQUEST 1 message " is transmitted to the SGSN through the RNC (step 502). 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 sends a second MBMS SERVICE ACTIVATION REQUEST 2 message (hereinafter referred to as an "MBMS SERVICE ACTIVATION REQUEST 2 message") to the GGSN (step 503). 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 an RNC in the MBMS SERVICE CONTEXT of the corresponding MBMS service and requests the 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 504).

After receiving the MBMS SERVICE ACTIVATION REQUEST 3 message from the GGSN in step 504, 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 the corresponding MBMS service. Allocate TMGI for. The BM-SC then transmits a third MBMS service response message (hereinafter referred to as "MBMS SERVICE RESPONSE 3 message") to the GGSN (step 505). 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 message (hereinafter referred to as an "MBMS SERVICE RESPONSE 2 message") to the SGSN (step 506). 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, as shown in FIG. 4, the PCSN transmission cycle PAGING_INTERVAL and offset information OFFSET for the PO capable of knowing whether the MBMS service-related control information is present in the 402 UE-dedicated PO. Determine the PCH transmission period PAGING_INTERVAL and offset information OFFSET for the PO dedicated to the 405 MBMS service. PCH transmission period PAGING_INTERVAL and offset information OFFSET for the PO capable of knowing the presence or absence of MBMS service control information in the determined 402 UE dedicated PO, PCH transmission period PAGING_INTERVAL and offset information OFFSET for the 405 MBMS service dedicated PO, and the MBMS service identifier And including the TMGI to transmit a first MBMS SERVICE RESPONSE 3 message (hereinafter referred to as an “MBMS SERVICE RESPONSE 1 message”) to the UE through the RNC (step 507). When the UE receives the MBMS SERVICE RESPONSE 1 message from the SGSN, the 402 UE dedicated PO included in the MBMS SERVICE RESPONSE 1 message receives a PCH transmission period PAGING_INTERVAL for the PO capable of knowing whether MBMS service control information is present. You can see the offset information OFFSET. It also recognizes the MBMS service identifier and the TMGI.

Thereafter, the UE receives a PICH signal for each corresponding 402 UE-dedicated PO corresponding to a preset DRX parameter, that is, a PO capable of knowing the presence or absence of control information for MBMS service among the 402 UE-dedicated POs. In step 550, the UE checks the unused part of the received PICH signal to determine whether the MBMS service that the UE wants to receive starts.

A general PICH slot format with respect to the unused area of the PICH is as follows.

One radio frame of the PICH has a length of 10 ms and consists 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 . For the unused area used for the MBMS service call, a method of knowing the location of the PI for the desired service by the UE itself, that is, a mapping relationship between the MBMS service PI and the TMGI may be defined as follows.

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

The UE monitors a paging indicator indicating that there is call information indicating transmission of MBMS service data of its TMGI, that is, its MBGI using the MBMS service PI value determined by Equation 2 above. . Meanwhile, the UE receives the corresponding PCH signal through the call identifier information of the MBMS service of the received PICH signal.

On the other hand, the BM-SC is a first MBMS Service NOTIFY 1 or Session start 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"). (Step 508). 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 sends a second MBMS SERVICE NOTIFY 2 or session start message to the RNC indicating that the MBMS service will be started soon (hereinafter, referred to as an “MBMS SERVICE NOTIFY 2 message”). "Will be called" (step 509). Here, the MBMS SERVICE NOTIFY 2 message includes a call cycle paging interval and offset information paging offset associated with the 405 MBMS service-dedicated PO to be used for transmission of TMGI of the upcoming MBMS service and control information of the MBMS service. Included. Receiving the MBMS SERVICE NOTIFY 2 message from the SGSN, the RNC indicates to the node B a third MBMS SERVICE NOTIFY 3 or notification message (hereinafter referred to as "MBMS SERVICE NOTIFY 3 message") indicating that the MBMS service will be started soon. It will be called) (step 510). In addition, the RNC uses the paging interval and paging offset associated with the 405 MBMS dedicated PO transmitted through the MBMS SERVICE NOTIFY 2 message to control the presence of control information for the MBMS service corresponding to the MBMS dedicated PO. It is used to tell if there is a presence The node B sends a fourth MBMS SERVICE NOTIFY 4 or notification message (hereinafter, referred to as an "MBMS SERVICE NOTIFY 4 message") indicating that the MBMS service will be started soon (step 511). ). Here, the MBMS SERVICE NOTIFY 4 message includes the TMGI of the soon-to-be-started MBMS service. In addition, the MBMS SERVICE NOTIFY transmitted by the RNC to the UE through the node B is transmitted through PCH. That is, the UE transmits a PI indicating whether the notification message is present in the 402 PO, and the UE confirming the value of "1" in the PI receives the PCH, and transmits the TMGI of the MBMS service requested by the UE in the PCH. Confirming is a method of notifying the UE of the start of the MBMS service proposed in the present invention.

The UE, which has detected that the requested MBMS service will be started soon through the service notification process, monitors the PICH through the 405 MBMS dedicated service PO determined using the paging interval and paging offset received in step 511 in addition to the 402 dedicated UE PO. (Step 560).

In addition, the RNC recognizes that the UE can use 402 PO and 405 PO through step 511 and transmits a PICH data frame or a PICH control frame to the node B at an appropriate time (step 512). The PICH data frame and the PICH control frame used will be described in detail with reference to FIGS. 7 and 8 below.

Recognizing that the MBMS service will start soon, the UE, the RNC, and the CN perform an assignment of wired and wireless resources to which the MBMS service is to be transmitted (step 513). In 3GPP, the data path from the central network to the RAN is called a radio access bearer (hereinafter referred to as RAB), and the data path from the RAN to the UE is called a radio bearer (hereinafter referred to as RB). . In the RNC, a mapping operation between RAB and RB is performed to generate a data path from the CN to the UE. The generated information about the RB is known to the UE through a radio resource allocation process. In the radio resource allocation process, the RNC informs UEs located in an arbitrary cell of radio bearer information to which the MBMS service is to be transmitted in the cell (hereinafter, referred to as "radio bearer setup"). And the RNC informing transport bearer information and radio bearer information to be configured on an Iub interface to cells where UEs to receive MBMS service are located (hereinafter, referred to as "radio link setup"). ). 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. Is complete. In this state in which the preparation for providing the MBMS service between the RNC and the UEs is completed, the CN performs the actual MBMS service process, that is, the MBMS service data transmission process of transmitting MBMS service data to the UEs through the RNC ( Step 514). When control information related to the MBMS service is generated to UEs receiving the MBMS service in the middle of step 514, the presence of the control information is informed through a PICH, and the UEs use the PICH using 405 PO or 402 PO. Receive After the MBMS service data transmission is completed, a radio resource release process (END OF MBMS SERVICE) is performed between the UE and the CN to release the set radio resources, that is, the transport bearer and the radio bearer (step 515). Step 516).

The difference between the first embodiment described above and the second embodiment to be described below is to directly give the Paging Interval and Paging Offset values associated with the 405 PO of FIG. 4 to each UE and to the UEs in the cell through the BCH or MCCH. The difference is the transmission.

Here, the advantage of the second embodiment is that when a UE requesting MBMS service from another cell moves to another cell before Session Start, the PO (MB 405 of FIG. 4) for the MBMS service is moved from the moved cell. It is possible to know the information without asking CN / UTRAN.

6 is a diagram illustrating a signaling flow between CN, UTRAN, and UE for the second embodiment presented in the present invention.

Referring to FIG. 6, in FIG. 6, the CN / UTRAN may transmit a paging interval and a paging offset for calculating the MBMS service dedicated PO of FIG. 4 through a BCH or an MCCH. An advantage of the method of transmitting through the BCH is that UEs that will receive MBMS service can obtain the information on the 405 PO by receiving the BCH. A disadvantage is that the BCH is a channel that is always transmitted, which causes waste of downlink radio resources. It can be. The advantage of the method of transmitting over the MCCH is that the time to obtain the parameters for calculating the 405 PO is later than the method of transmitting over the BCH, but the MCCH is not always the channel to be transmitted. It can save downlink radio resources.

In order to use the method proposed in FIG. 6, a method of informing a parameter for calculating the 405MBMS service-dedicated PO from CN to RNC may also differ from the method proposed in FIG. 5. In the method proposed in FIG. 5, the RNC needs to know a parameter for calculating the 405 PO only immediately before using the 405 PO. However, in the method shown in FIG. 6, the RNC informs the UE of the parameters for calculating the 405 PO through the BCH or MCCH, before the RNC transmits the parameters related to the 405 PO through the BCH or MCCH. You need to know the value. Accordingly, the SGSN informs the RNC of parameters for calculating the 405 PO through a 607 MBMS Service Activation response 2 message or a 609 Session start message. In addition, the time when the SGSN informs the RNC of the parameters for calculating the 405 PO should be a time before the RNC informs the parameters for calculating the 405 PO through BCH or MCCH. That is, the positions of steps 650 and 670 in FIG. 6 are disposed for convenience of description of the present invention, and steps 605 or 670 may be located at any time after the RNC acquires the 405 PO. have. Detailed operation of the UE for the method shown in FIG. 6 will be described in FIG. 14 below.

7 and 8 are schematic views of a data frame and a control frame to be used for transmitting bitmap information of a PI to be transmitted to a PICH in an Iub frame protocol between an RNC and a node B according to the first and second embodiments of the present invention. Phosphorus structure.

Referring to FIG. 7, 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 transmission of MBMS service call information using an unused region. The RNC transmits an MBMS service identifier to node B through a data frame of the Iub frame protocol. In the present invention, the RNC transmits the MBMS service identifier to node B using the unused region. Thus, FIG. 7 illustrates a data frame structure of a new Iub frame protocol in which an MBMS service PI bitmap is added to a data frame structure of a general Iub frame protocol.

In FIG. 7, 701 is a CRC for a header part, and 702 is an indicator indicating whether a type of a frame protocol is a data frame or a control frame. A Connection Frame Number (hereinafter referred to as CFN) indicates a time at which the data frame is to be applied. The 705 PI is an indicator indicating that there is a PI to inform the presence of control information for services other than the MBMS service, and PI bit maps corresponding to the 705 PI indicator are 708 and 709. In the data frame structure of FIG. 7, the 704 MBMS Indication (MI) indicates whether the 715 MBMS service PI bitmap is in a payload, and the 704 MBMS service indication is set to "0". If there is 715 the MBMS service PI bitmap does not exist, and if the 704 MBMS service indication is set to "1", the MBMS service PI bitmap exists. The MBMS service indication may have one, two, three, four, six, or twelve indications according to the value of the 705 MBMS service PI bitmap. 715 MBMS Service PI bitmap field has a size of 2 bytes. In the data frame structure of the Iub frame protocol, the 717 PICH interval (PICH DURATION) informs the base station how long the PICH for MBMS service is to be transmitted. Meanwhile, the present invention provides a method of continuously transmitting the MBMS service indication to the PICH for a preset time instead of allowing the variable transmission period of the MBMS service PICH to be set variably. 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 FIG. 7, 707 is an indicator of a transmission type to which the data frame is to be transmitted, and 710, 712, 714, 716 and 718 indicate padded bits. 706 indicates a position where the extra bits can be transmitted, and 711 first TB and 713 last TB are parts used for transmission of data from the RNC to node B. 719 and 720 are CRCs that can check for errors in the payload portion, and 720 represents an extra portion that can be extended for other purposes. The payload is from 708 PI Bitmap to 721 redundant extensions.

The following two methods may be considered in delivering information necessary for transmitting PCH and PICH to node B through the Iub frame protocol, and the two methods are as follows.

The first method is a method in which the RNC delivers the transmission period PAGING_INTERVAL and offset information OFFSET related to the PICH transmission and the PCH transmission to node B each time using a frame protocol.

In the first method, when the time point at which the PCH for the MBMS service 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 service 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, it is not necessary to transmit PICH DURATION information in the data frame structure of the Iub frame protocol illustrated in FIG. 7.

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 node B using the frame protocol, the PICH indicating the MBMS service call related information is set in advance since the current transmission. It is a method to send a message to repeat the number of times. 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 MBMS service, such as the present invention, that is, PCH signal transmission, an MBMS service call message (MBMS paging) supporting the MBMS service call in a general paging type I message (paging type I message) message) must be added. Of course, the MBMS service call message may be implemented as a separate new structure, but the present invention will be described on the assumption that it is implemented in the form of changing or adding an existing call type 1 message.

In this case, information elements (IE) (hereinafter, referred to as "IE") added to the MBMS service 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 service radio bearer information may be additionally included in the call type 1 message. The MBMS service radio bearer information may be referred to as layer 2 (hereinafter referred to as "L2") information and layer 1 (layer 1, below). Information is referred to as " L1 ", and the L2 information includes radio link control (RLC) " Packet Data Convergence Protocol (PDCP) " Or hereinafter referred to as “PDCP”) related information. 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 changes the number of PCH signal transmissions for transmitting the MBMS service related call information, when the UE transmits information on the MBMS service that a specific UE wants to receive only once, the UE indicates the MBMS service transmitted through the PICH. If the MBMS service indication is the MBMS service that the UE itself wants to receive, it should receive a PCH signal for transmitting the MBMS service 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 wants to receive the PCH signal for transmitting the MBMS service call information, it is impossible to obtain MBMS service related information. Thus, the RNC repeats the PCH signal for transmitting the MBMS service related call information by a preset number of times, and indicates how many more times of transmission of the same MBMS service related call information remain in the existing call type 1 message. Add a new IE. Herein, an IE indicating how many more times of transmission of the same MBMS service call information remains is defined as "paging RES". Since the UE can predict the number of times the same MBMS service related call information is repeatedly transmitted from the time point after the current time point using the paging RES, the UE repeatedly demodulates the previously received MBMS service related call information. Will be removed.

In the description of FIG. 7, a method of transmitting MBMS service control call information using a data frame of an Iub frame protocol has been described. In the description of FIG. 8, an IuB frame protocol is described in the method of transmitting the MBMS service control call information. Describes how to use the control frame. In 3GPP frame protocol, 11 control frames (Outerloop power control, Timing Adjustment, DL synchronization, UL Synchronization, DSCH TFCI signaling, DL node Synchronization, UL node synchronization, Dynamic PUSCH Assignment, Timing Advance, HS-DSCH capacity It defines the operation and role of request and HS-DSCH Capacity allocation. However, the present invention proposes a new control frame called MBMS Paging Control Frame.

8 illustrates an example of the MBMS service call control frame proposed in the present invention, and the structure of the MBMS service control frame of FIG. 8 is configured by including information necessary for the present invention in the basic structure of the current 3GPP IuB control frame. One example.

The 801 frame CRC (hereinafter, referred to as a CRC) of FIG. 8 is used for error detection in the control frame and has a 7-bit length. The 802 frame type (hereinafter referred to as "F / T") has a length of 1 bit and indicates whether the corresponding frame is a data frame or a control frame. 803 indicates a type of a control frame, has a value of 8 bits, and indicates an MBMS service call control frame according to the present invention. A connection frame number (referred to as "CFN") of 804 indicates when to start the contents of the control frame, the basic unit is a radio frame of 10ms. The 804 CFN plays the same role as the MBMS paging offset of FIG. 6. 805 and 806 are MBMS Service IDs and indicate the MBMS service indicated by the call information of the MBMS service call control information frame, and may have multiple identifiers according to the service. In addition, the MBMS service identifier may or may not be used in the MBMS call control frame. When several MBMS services are being serviced or call information for any MBMS is transmitted in the past, and call information for any other MBMS service is transmitted, it can be used for distinguishing the MBMS service information. In this case, if only one call information is transmitted, the MBMS service identifier may not be transmitted.

807 and 808 are MBMS paging indicator mapping information. As described above, since the unused area of the PICH to which the MBMS call information is transmitted has a length of 12 bits, the 807 and 808 transmit the MBMS call indicator bit mapping information. The MBMS call information control frame presented in the present invention may optionally have a value of 808 paging duration. The call period may be used to set the transmission period of the PICH corresponding to the MBMS call control information frame containing the call duration value, and also transmit each of the paging indicators indicating different MBMS services. Can be used to set the duration. In case of setting the PICH transmission period for each frame, the RNC transmitting the MBMS call information frame may transmit MBMS call information frame with new contents after the transmission period of the MBMS call information frame. The reason is that UEs receiving the MBMS service corresponding to the MBMS call information frame can sufficiently receive the call information only when there is sufficient transmission of the PICH included in the first transmitted MBMS call information frame. In order to call another service during a call to any service, a reason why a transmission period is required for each call indicator may be necessary. In other words, while a call is being made to transmit control information for certain MBMS services to UEs trying to receive the MBMS services, the contents of the call may be changed to start another MBMS service. . In order to efficiently make a call for transmitting control information for the MBMS services and a call for the other MBMS services at the same time, it is possible to use the PI-specific call period proposed in the present invention. The 811 is free space in case there is a function to be added in the future, and may not be used when there is no function to be added in the future.

Operation of the wireless communication networks according to the first embodiment proposed in FIG. 5 will be described with reference to FIGS. 9, 10, and 11 below. In addition, operations of the wireless communication networks according to the second embodiment proposed in FIG. 6 will be described with reference to FIGS. 12, 13, and 14 below.

9 is a flowchart showing the operation of the CN according to the first embodiment of the present invention.

Referring to FIG. 9, at 901, the CN starts to inform the MBMS service. The subject of the announcement may be the BM-SC of the CN or the CBC. In response to the announcement, a request message for the MBMS is received from UEs at 902. The request message for the MBMS is sent to the BM-SC via SGSN to determine whether the UE is eligible to receive the MBMS at 903. In determining the suitability, the HLR may be involved in addition to the BM-SC. That is, the HLR checks the charging information state of the UE for receiving the MBMS service. At 903, the CN which finishes the authentication for the UEs sends an MBMS acknowledgment message indicating that the MBMS can be received for the UEs that have passed the authentication, and for the UEs that have not passed the authentication. Send a negative response message. In the present invention, the UE does not describe the UE that has not passed the authentication task because it can receive the MBMS. That is, in 904, an MBMS acknowledgment message is transmitted to UEs that have passed the authentication task. Here, the acknowledgment response message may include parameters related to TMGI, cryptography, and PO for the MBMS requested by the UE. The parameters related to the PO may include a parameter for calculating a PO to which a PI capable of knowing the existence of control information for MBMS in a UE dedicated PO and a parameter for calculating an MBMS dedicated PO.

In 905 of FIG. 9, the CN transmits a Session Start message to RNCs having node Bs to receive the MBMS. In this case, the CN transmits to the session start message including the parameters for calculating the MBMS dedicated PO and proceeds to step 910. If new control information related to the MBMS is generated in step 910, the flow proceeds to step 909, and if not, the flow proceeds to step 906. After setting the RAB in step 906, it is checked in step 911 whether new control information related to the MBMS has occurred. At this time, if new control information is generated, the process proceeds to 909 to perform the corresponding operation. On the other hand, if new control information does not occur, the process proceeds to 907 and transmits the corresponding MBMS data. Thereafter, it is checked at 908 whether new control information related to the MBMS occurs. If new control information is generated, the process proceeds to 909 and performs the original operation after the call request for the UEs to receive the control information. On the other hand, if no new control information is generated at 908, the process proceeds to 907 to transmit the MBMS service data.

10 is a diagram illustrating a flow for operation of the UTRAN in the first embodiment of the present invention.

Referring to FIG. 10, at 1001, the UTRAN receives an MBMS service announcement and transmits the information to UEs under the control of the UTRAN. At 1002, the UTRAN receives information about UEs to receive the MBMS from the CN, namely a UE list and a session start message. The session start message includes parameters for calculating an MBMS-only PO. At 1003 the UTRAN sends a service notification (hereinafter referred to as "Notification") message to each of the cells where the UEs will receive the MBMS. The notification message means that the MBMS service will start soon. At 1004, the UTRAN performs RAB setup for MBMS and RB setup for MBMS. In the RB setting process for the MBMS, the number of UEs is checked for each cell in the UTRAN to determine whether to set an RB for PTP or an RB for PTM. At this time, the determination process of the RB for PTP / RB for PTM is called a counting process. At 1005, the UTRAN prepares to generate a data frame or control frame of an IuB frame protocol for transmission of a PICH for notifying the presence of the MBMS control information, transmits it at a necessary time, and proceeds to step 1010. The structure of the data frame and the control frame is the same as the description of FIGS. 7 and 8. In step 1010, if a new call request signal related to the MBMS is received or generated, proceed to step 1009, and if a new call request signal is not received or occurs, proceed to step 1006. In step 1006, the MBMS RAB information determined in step 1004 is transmitted to UEs to receive the MBMS, and the process proceeds to step 1011. In step 1011, if a new call request signal related to the MBMS is received or generated, proceed to step 1009, and if a new call request signal is not received or occurs, proceed to step 1007. In step 1007, MBMS data is transmitted to the UEs through the configured MBMS RB. In step 1008, if a new call request signal related to the MBMS is received or generated, proceed to step 1009. If a new call request signal is not received or does not occur, step 1007 is performed again. In 1009, an original operation is performed after transmitting a data frame or a control frame for PICH transmission. The data frame or control frame is transmitted from the RNC to node B, and the node B sets and transmits a PICH based on the contents of the data frame or control frame.

11 is an operation flowchart of a UE corresponding to the first embodiment.

Referring to FIG. 11, in 1101, the UE receives a service announcement for an MBMS and transmits a service activation request for the MBMS to a CN. The service activation request for the MBMS includes the identifier of the UE and the MBMS service identifier. In 1103, a response to the MBMS service activation request is received from the CN. The response message to the MBMS service activation request includes parameters for calculating a PO for identifying the presence of TMGI of the MBMS, encryption information for the MBMS, and control information of the MBMS. The PO may be transmitted by a PI capable of knowing whether control information for MBMS is present in a UE dedicated PO, or may be an MBMS dedicated PO according to data transmission of a corresponding MBMS service. At 1104, the UE receives a notification message that an MBMS is about to start, and after receiving the notification message, at 1105, a UE receives a PICH including a UE-dedicated PO and an MBMS-only PO, thereby providing control information or other control information for the MBMS. Judge whether there is any, and proceed to step 1110. In step 1110, it is determined whether a call is received from a higher level network. If the call is received, the flow proceeds to step 1109. If the call is not received, the flow proceeds to step 1106. In step 1106, the UE receives MBMS RB information and proceeds to step 1111. In step 1111, it is determined whether a call is received from a higher level network. If the call is received, the flow proceeds to step 1109. If the call is not received, the flow proceeds to step 1107. In 1107, a radio channel is allocated using the received RB information. Thereafter, MBMS data is transmitted. Proceed to step 1108. In step 1108, it is determined whether a call is received from a higher level network. If the call is received, the flow proceeds to step 1109. If the call is not received, the flow returns to step 1107. After 1105, if the value of the PI for the UE is 1 in the UE-dedicated PO or MBMS-only PO, the UE receives the PCH in step 1109 to determine whether control information for the UE is to be transmitted. After performing, perform the relevant operation. That is, if it is recognized that the call exists from the upper network as shown in 1110 and 1111, the process proceeds to 1109 to check the call channel and then performs the corresponding operation.

12 is a flowchart showing the operation of the CN according to the second embodiment of the present invention.

Referring to FIG. 12, at 1201, the CN starts guiding the MBMS service. The subject of the announcement may be the BM-SC of the CN or the CBC. In step 1202, a request message for the MBMS is received from a plurality of UEs in response to the service announcement. The request message for the MBMS is sent to the BM-SC via SGSN. At this time, the UE determines whether the UE is eligible for receiving the MBMS. In determining the suitability, the HLR may be involved in addition to the BM-SC. In 1203, after completing the authentication task for the UEs, the CN transmits a service acknowledgment message to the UEs that have passed the authentication task and a negative response message to the UEs that have not passed the authentication task. . In 1204, it is assumed that an acknowledgment message sent to UEs that have passed the authentication operation. The acknowledgment message may include parameters related to TMGI and cipher for the MBMS requested by the UE. In the process of transmitting the acknowledgment message, parameters related to the PO are transmitted only to the RNC. The parameters related to the PO may include a parameter for calculating a PO to which a PI capable of knowing the existence of control information for MBMS in a UE dedicated PO and a parameter for calculating an MBMS dedicated PO.

In 1205 of FIG. 12, the CN transmits a Session Start message to RNCs having node Bs to receive the MBMS, and proceeds to step 1210. If parameters for calculating an MBMS dedicated PO are not transmitted to RNCs including UEs that will receive the MBMS at 1204, the session start message may include parameters for calculating the MBMS dedicated PO. In step 1210, if new control information related to the MBMS is generated, the process proceeds to step 1209, and if not, proceeds to step 1206. In step 1206, the RAB setting operation to be used to transmit the MBMS is performed with the RNCs that have sent the positive response to the session start message transmitted in 1205. After setting the RAB, it is checked whether new control information related to the MBMS has occurred in step 1211. At this time, if new control information is generated, the process proceeds to 1209 to perform the corresponding operation. On the other hand, if no new control information is generated, the process proceeds to 1207 and transmits the corresponding MBMS data. In step 1207, the MBMS data is transmitted, and the process proceeds to step 1208. In step 1208, it is checked whether new control information related to the MBMS has occurred. At this time, if new control information is generated, the process proceeds to 1209 to perform the corresponding operation. On the other hand, if no new control information is generated, the process returns to 1207. In step 1209, a call request for UEs to receive the control information is transmitted to the RNC, and then the original operation is performed.

13 is a flowchart illustrating the operation of the UTRAN according to the second embodiment of the present invention.

Referring to FIG. 13, an MBMS service announcement is received at 1301 and then transmitted to UEs below the UTRAN. The MBMS service guide can also be performed using a web such as the Internet. However, in the description of the present invention, it is assumed that the service guide broadcast is provided through a 3GPP wireless communication network. At 1302, an activation response message for the MBMS service is received from SGSN. In this case, the message may include parameters for performing an MBMS call. In 1303, parameters capable of performing the MBMS call are transmitted to a plurality of cells in the UTRAN through a BCH. At 1304, the UTRAN receives information about UEs that will receive MBMS from the CN, ie UE lists, through a Session start message. In this case, if the parameters for performing the MBMS call are not received from the CN at 1302, the Session start message may include parameters for calculating the MBMS dedicated PO. In addition, the UTRAN transmits a Notification message to each cell in which there are UEs to receive the MBMS at 1304. The Notification message means that the MBMS service will start soon. If the parameters to be used for the MBMS call are not transmitted through the BCH in 1303, the parameters are transmitted using a control channel (MBMS Control CHannel, hereinafter referred to as "MCCH") that transmits control information for supporting the MBMS service in 1312. It may be sent to the UEs to receive the MBMS. Accordingly, in 1305, a data frame or a control frame of an IuB frame protocol is prepared for transmission of a PICH for notifying the existence of the MBMS control information, and then transmitted when necessary. The structure of the data frame and the control frame is shown in the description of FIGS. 7 and 8 above.

The UTRAN performs RAB setup and RB setup to provide MBMS at 1306. In the RB setting operation for providing the MBMS, the process of determining whether to set the RTP for the PTP or the RTM for the PTM by examining the number of UEs for each cell in the UTRAN is called counting. In addition, in 1307, the RB information providing the determined MBMS is transmitted to UEs that will receive the MBMS, and in 1307, MBMS data is transmitted to the UEs through the configured MBMS RB. When receiving a new call request for the MBMS or performing a new call request according to the purpose of UTRAN during steps 1305, 1306, 1307 and 1317, after transmitting a data frame or a control frame for PICH transmission in 1309. The original operation will be performed. That is, when a new call request based on the MBMS service support occurs in 1310 and 1311, the process proceeds to 1309 and transmits a data frame or a control frame for PICH transmission and then performs the original operation. The data frame or control frame is transmitted from the RNC to node B, and the node B sets and transmits a PICH based on the contents of the data frame or control frame.

14 is a flowchart illustrating the operation of a UE according to the second embodiment of the present invention.

Referring to FIG. 14, at 1401, the UE receives a service announcement broadcast for an MBMS, and at 1402, transmits a service activation request for the MBMS to the CN. The service activation request for the MBMS includes the identifier of the UE and the MBMS service identifier. At 1403, the UE receives a response to the MBMS service activation request sent from the CN. The response message for the MBMS service activation request includes the TMGI of the MBMS and the encryption information for the MBMS. In 1404, the UE receives parameters for calculating the MBMS dedicated PO through the BCH. In 1405, the UE-dedicated PO determines whether there is control information for the MBMS service and whether there is control information for services other than the MBMS service. At this time, at 1406, the UE receives a notification message that MBMS is about to start. If the parameters for calculating the MBMS dedicated PO at 1404 are not transmitted through the BCH, the parameters can be received using the MCCH at 1407. In a real system, parameters capable of calculating the MBMS dedicated PO will be transmitted using only one of the BCH and the MCCH. After receiving the notification message, the PICH is received in the UE-dedicated PO and MBMS-dedicated PO in 1408 to determine whether there is control information or other control information for the MBMS. The UE receives MBMS RB information at 1409 and MBMS data using the received RB information at 1410. After 1408, when the value of PI for the UE is 1 in the UE-dedicated PO or MBMS-only PO, the UE receives PCH at 1411 and performs a final acknowledgment process as to whether control information for the UE is to be transmitted. After that, perform the relevant operation. That is, if there is a call for the presence or absence of control information or other control information for the MBMS as in 1420, 1421 and 1422, the process proceeds to 1411 to check the PCH to perform the corresponding operation. .

Accordingly, the present invention provides a method for efficiently calling UEs receiving the MBMS for transmission of MBMS control information. In addition, the present invention has an effect of saving the battery of the UE in calling the UEs. In addition, in the present invention, the method of calling the UEs has an effect of using different call times according to the amount of information and the number of information of the downlink control message to the UE.

Claims (25)

A user terminal, a base station controller for controlling a cell including the user terminal and an adjacent cell adjacent to the cell, and a multimedia broadcast / multicast service (hereinafter, referred to as MBMS) service to the user terminal. In a mobile communication system including a core network for providing a method, the method for calling the user terminal to transmit control information according to the MBMS service support to the user terminal, The core network receives a MBMS service request message from the user terminal, and a parameter indicating a first call point indicating whether there is control information according to MBMS service support for the user terminal in a response message corresponding to the MBMS service request message. Transmitting a message including the message, The core network may further include parameters including a second call time indicating whether there is control information according to the specific MBMS service in a message indicating that a specific MBMS service requested by the user terminal is started. In accordance with claim 1, The core network transmits to the user terminal through the MBMS service response message by determining a transmission period, which is a parameter indicating a first call time indicating whether there is control information according to MBMS service support for the user terminal, and an offset. Characterized in that the method. The method of claim 1, The core network transmits to the user terminal through a message indicating the start of the transmission of the specific MBMS by determining a transmission period and parameters, which are parameters indicating a second call point indicating the presence or absence of control information according to the specific MBMS service. Characterized in that the method. According to claim 3, the transmission period indicating the second call time indicating the presence or absence of control information according to the specific MBMS service, and the offset to determine the start of the specific MBMS service request message to the user terminal through the session message Said method comprising a transmission box. The method of claim 4, wherein Wherein the core network further includes the MBMS service identifier and a temporary multicast group identifier (TMGI) to transmit to the user terminal. In a mobile communication system including a user terminal, a base station controller for controlling a cell including the user terminal and an adjacent cell adjacent to the cell, and a core network for providing an MBMS service to the user terminal, control according to the MBMS service support. In the method for calling the user terminal to transmit information to the user terminal, The core network includes a first call time point for receiving an MBMS service request message from the user terminal and notifying the presence or absence of control information according to MBMS service support for the user terminal in a response message corresponding to the MBMS service request message. Transfer process, The temporary multicast group of a specific MBMS service requested by the user terminal by the user terminal receiving a first identifier indicating whether the MBMS service is transmitted or not according to the first call time, and receiving a call message corresponding to the first identifier Checking the identifier (TMGI), After confirming that the requested MBMS service starts by checking a temporary multicast group identifier (TMGI) of the specific MBMS service, the specific MBMS service according to a second call time indicating whether there is control information for the specific MBMS service. And receiving a call message corresponding to a second identifier indicating whether or not the transmission has occurred. In a mobile communication system including a user terminal, a base station controller for controlling a cell including the user terminal and an adjacent cell adjacent to the cell, and a core network for providing an MBMS service to the user terminal, control according to the MBMS service support. In the method for calling the user terminal to transmit information to the user terminal, The core network transmits, through the broadcast channel (BCH) for transmitting the MBMS system information, a second call point informing the base station controller of the presence or absence of control information according to a specific MBMS service requested by the user terminal. Way. The method of claim 7, wherein The core network further includes transmitting to the base station controller, through a broadcast channel (BCH), which transmits the MBMS system information, a first call point indicating whether there is control information according to MBMS service support for the user terminal. Characterized in that the method, In a mobile communication system including a user terminal, a base station controller for controlling a cell including the user terminal and an adjacent cell adjacent to the cell, and a core network for providing an MBMS service to the user terminal, control according to the MBMS service support. In the method for calling the user terminal to transmit information to the user terminal, The core network transmits, through the MBMS Control Channel (MCCH), which transmits the control information of the MBMS, to the base station controller, a second call time indicating whether there is control information according to a specific MBMS service requested by the user terminal. Said method. The method of claim 9, The core network further transmits, through the MBMS Control Channel (MCCH), the core network to transmit control information of the MBMS to the base station controller. The method characterized in that. In a mobile communication system supporting a multimedia broadcasting / multiple broadcasting service, a method of calling a user terminal to transmit and receive control information for supporting the MBMS service, The core network transmits to the user terminal through an MBMS service activation response message including a first transmission period and first offset information for calculating a first transmission time point of a call identifier indicating whether there is control information for the MBMS. Process, The transmission of the specific MBMS service further includes a second transmission period and second offset information for calculating a second transmission time point of a call identifier indicating whether there is control information for the specific MBMS service requested by the user terminal. And transmitting the message through an informing session message. The method of claim 11, The transmission period and the offset information is determined in accordance with the channel situation in units of cells requesting the MBMS service. The method of claim 11, The second transmission period and the second offset information is transmitted to the base station through a control frame of the frame protocol, the base station further comprises transmitting the second transmission period and the second offset information to the user terminal, characterized in that Said method. In a mobile communication system supporting a multimedia broadcasting / multiple broadcasting service, a method of calling a user terminal to transmit and receive control information for supporting the MBMS service, The core network transmits to the user terminal through an MBMS service activation response message including a first transmission period and first offset information for calculating a first transmission time point of a call identifier indicating whether there is control information for the MBMS. Process, A broadcast channel for transmitting a system information supporting the MBMS service with a second transmission period and second offset information for calculating a second transmission time of a call identifier indicating whether there is control information for a specific MBMS service requested by the user terminal And transmitting through (BCH). The method of claim 14, The transmission period and the offset information is determined in accordance with the channel situation in units of cells requesting the MBMS service. The method of claim 14, The second transmission period and the second offset information is transmitted to the base station through a control frame of the frame protocol, the base station further comprises transmitting the second transmission period and the second offset information to the user terminal, characterized in that Said method. In a mobile communication system supporting a multimedia broadcast / multicast service (hereinafter referred to as "MBMS"), a method for calling a user terminal to transmit and receive control information for supporting the MBMS service, The core network transmits to the user terminal through an MBMS service activation response message including a first transmission period and first offset information for calculating a first transmission time point of a call identifier indicating whether there is control information for the MBMS. Process, MBMS for transmitting control information for supporting the MBMS service and a second transmission period for calculating a second transmission time and a call identifier indicating whether there is control information for a specific MBMS service requested by the user terminal; The method as described above, characterized in that the transmission via the control channel (MCCH). The method of claim 17, The transmission period and the offset information is determined in accordance with the channel situation in units of cells requesting the MBMS service. The method of claim 17, The second transmission period and the second offset information is transmitted to the base station through a control frame of the frame protocol, the base station further comprises transmitting the second transmission period and the second offset information to the user terminal, characterized in that Said method. In a mobile communication system supporting a multimedia broadcast / multicast service (hereinafter referred to as "MBMS"), a method for calling a user terminal to transmit and receive control information for supporting the MBMS service, When a Serving GPRS Support Node (SGSN) receives a specific MBMS service request from the user terminal, a service packet wireless service support node (SGSN) provides offset information for indicating a transmission period for transmitting call information related to the specific MBMS service and a transmission start position thereof. Transmitting to a radio network controller (RNC); Transmitting, by the RNC, the specific MBMS service notification notification message to the user terminal including a transmission period for transmitting call information related to the specific MBMS service and offset information for indicating a transmission start position thereof; And receiving, by the user terminal, the specific MBMS service notification notification message and repeatedly checking a call indication channel according to the specific MBMS support corresponding to the transmission period at a call time determined according to the offset information. Said method. The method of claim 20, The transmission period and the offset information is characterized in that determined for each service or unit of routing area of the MBMS service. The method of claim 20, The RNC further comprises the step of transmitting the transmission period and offset information to the base station through a control frame of the frame protocol. The method of claim 20, The control frame includes information indicating a section for transmitting the call period for transmitting the call indication channel corresponding to the transmission period, and information indicating a section for transmitting offset information indicating a transmission start point of the call indication channel. Characterized in that the method. In a mobile communication system supporting a multimedia broadcast / multicast service (hereinafter referred to as "MBMS"), a method for calling a user terminal to transmit and receive control information for supporting the MBMS service, When receiving a request for a specific MBMS service from the user terminal, the service packet Serving GPRS Support Node (SGSN) provides offset information for indicating a transmission period for transmitting call information related to the specific MBMS service and a transmission start position thereof. Transmitting to a radio network controller (RNC); Transmitting, by the RNC, to the user terminal through a broadcast channel for transmitting the MBMS system information including a transmission period for transmitting call information related to the specific MBMS service and offset information for indicating a transmission start position thereof; And the user terminal repeatedly checking a call indication channel according to the specific MBMS support at a call time determined according to the transmission period and the offset information. In a mobile communication system supporting a multimedia broadcast / multicast service (hereinafter referred to as "MBMS"), a method for calling a user terminal to transmit and receive control information for supporting the MBMS service, When a service packet Serving GPRS Support Node (SGSN) receives a request for a specific MBMS service from the user terminal, a transmission cycle for transmitting call information related to the specific MBMS service and offset information for indicating a transmission start position thereof Transmitting to a radio network controller (RNC); The RNC transmitting the call information related to the specific MBMS service to the user terminal through an MBMS control channel according to the MBMS service support, including a transmission period for transmitting call information related to the specific MBMS service and offset information for indicating a transmission start position thereof; And the user terminal repeatedly checking a call indication channel according to the specific MBMS support at a call time determined according to the transmission period and the offset information.