KR101572890B1 - MBS transmission method considering idle mode terminal - Google Patents

Abstract

An operation method of a terminal and a network for effective MBS transmission / reception considering the terminals operating in an idle mode while receiving MBS (Multicast Broadcast Service), which is a service for transmitting multimedia data, is disclosed. The method includes transmitting a message including an MBS service retain request requesting MBS configuration information to be maintained by a paging controller to a serving BS, and transmitting a MBS traffic data indication from a serving BS to the serving BS. Receiving MBS traffic data from the serving base station, and receiving MBS traffic data from the serving base station.

MBS, Idle Mode, offset

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an MBS transmission method,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a multicast broadcast service (MBS), and more particularly, to a method for transmitting MBS data in consideration of a terminal entering an idle mode.

A terminal receiving a broadcast or MBS service in a wireless communication network obtains information on a service through higher-level procedures with a server providing the service to start the service. When the terminal decides to receive the service, the server transmits the data to the area to which the terminal belongs. The terminal can receive the service from the base station through the connection procedure with the base station located in the area.

More specifically, data transmission between a base station and a mobile station (MS) in a broadband wireless access system is performed through a "service flow ". The service flow includes an SF ID (service flow identifier) identifying a corresponding service flow between a base station and an MS, a CID (connection identifier) identifying a connection conveying service flow traffic, And quality of service (QoS) parameters related to the quality of service.

Generally, the service flow forms a one-to-one connection between the base station and the MS. However, the MBS used for transmitting MBS data in an IEEE 802.16 system features a point-to-multipoint service that transfers data from one source to multiple recipients. Therefore, the base station delivers the same data to multiple MSs through one service flow.

That is, when generating the MBS service flow of the base station and the MS, the base station grants the same CID to the MSs requesting MBS data reception so that the same MBS data can be simultaneously received by several MSs. The coverage that can provide service by giving one CID to multiple MSs is called MBS zone.

The MBS zone can be composed of several base stations. In a MBS zone, several base stations can provide the same service in a plurality of cells through one service CID. Because of this nature, the MBS typically delivers data common to multiple recipients across multiple base stations from one source.

In order to start the MBS service, the UE establishes a connection with the BS through a dynamic service addition (DSA) process. Through the connection setup, the user receives the connection identifier and QoS information.

Among the information used for the MBS, the configuration of the MBS_MAP message is shown in Table 1 below.

The MBS_MAP message is information that is sent from the base station to the terminal to receive the service and transmits information for reading the service. The MS receiving the MBS_MAP message can confirm the service point of the MBS through the additional information such as MBS_DATA_IE or Extended_MBS_DATA_IE.

The MBS_DIUC_Change_Count field may be used to indicate a change in the burst profile used for multi-base station MBS data. If the MBS_DIUC_Change_Count is changed, the UE has to wait until the DCD message is received unless the DLV file TLV is included in the MBS_MAP.

The MBS_DATA_IE designates an area to which the current MBS data is allocated and an area to which the MBS data is to be allocated next. This allows the user to receive data at the present time and to know the allocation area to be read next time.

Next, the idle mode will be described.

The idle mode is a mechanism for supporting the UE to periodically receive the downlink broadcast traffic transmission without registering in a specific base station even if the UE wanders a wireless link environment composed of multiple BSs over a wide area. That is, the terminal in the idle mode does not have to comply with the requirements for handover or general MAC operation.

However, the mobile station in the idle mode may check whether it is called from the base station at predetermined time intervals. Thus, the idle mode provides a simple and appropriate way to notify for pending downlink traffic to the terminal, and removes the air interface and network handover traffic from the inactive terminal, .

In addition, the terminal restricts the terminal activity to scan in the discrete period so that the terminal can conserve power and operational resources. The idle mode terminal returns all connection identifiers (CIDs), management CIDs (MCIDs), and Internet Protocol (IP) addresses.

Hereinafter, an example of a procedure in which the UE enters the idle mode and operates in the conventional IEEE 802.16e system will be described with reference to FIG.

Referring to FIG. 1, a UE initially transmits a de-registration request (hereinafter referred to as "DREG-REQ") message to a serving BS to enter an idle mode in a normal mode (S110).

Upon receiving the DREG-REQ message, the serving base station may exchange information of the serving base station and the mobile station in a paging controller (S120).

Next, the serving base station may transmit a de-registration command (hereinafter referred to as "DREG-CMD") to the terminal (S130).

Upon receiving the DREG-CMD message from the serving BS, the UE confirms that the request for the entry into the idle mode has been successfully accepted, and enters the idle mode (S140).

The paging controller can perform a paging procedure for searching for the terminal when a call or an external packet is received in step S150.

Here, the paging procedure is a function for allowing a terminal to receive traffic by informing a terminal of the arrival of pending downlink traffic through a base station or a specific network entity for a specific terminal in an idle mode, and transitioning to a normal mode state.

For this, the paging controller can inform the serving base station of the arrival of the traffic using the information stored in the step of exchanging the information of the mobile station and the serving base station (S120). Accordingly, the serving BS may transmit a paging message (MOB_PAG-ADV) informing the MS of the arrival of the traffic.

Upon receiving the paging message from the serving base station, the mobile station checks the message and enters the normal mode when it has paged itself (S170) to perform communication with the base station (S180). A terminal that enters the normal mode can communicate with a base station.

In addition, when the UE moves to another cell located in the same MBS zone in the idle mode, the UE does not newly establish a connection for MBS. However, if the UE moves to another MBS zone, it can receive the MBS by resetting the connection for MBS.

However, when transmitting the MBS data in the mobile communication network, the MBS network needs a level of modulation and coding (MCS) that all terminals receiving the MBS data in the cell can receive error- Scheme).

Here, the MBS network is an entity that receives data from an MBS content provider and delivers the MBS data to a serving base station in charge of the terminal so as to be transmitted to a terminal receiving the service, thereby distributing the MBS data It says. Typical examples include an MBS server, an MBS gateway, or an MBS controller.

When the terminal receiving the MBS enters the idle mode and the time when the actual service starts does not match, the terminal must receive control information for the MBS to be received continuously. This leads to a waste of power of the terminal due to the reception of unnecessary control information, and thus a more efficient MBS data transmission / reception method is required.

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems of the conventional technology as described above, and it is intended to receive control information from a point of time when an MBS to be received by a UE actually starts and provide operating methods of the network.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, There will be.

According to an aspect of the present invention, there is provided a method for receiving a Multicast & Broadcast Service (MBS) in an idle mode terminal according to an exemplary embodiment of the present invention, Transmitting a message including an MBS service retain request to a serving base station; receiving a paging message including an MBS traffic data indication from a serving base station; And receiving MBS traffic data from the MBS traffic data.

Preferably, the MBS configuration information may include at least one of an MBS zone identifier (MBS_ZONE_ID), security related information, and a multicast connection identifier (MCID).

Preferably, the MBS traffic data includes MBS data and MBS control information required to receive the MBS data, and the MBS control information may be transmitted from the serving base station through a multicast service control channel (MSCCH) have.

Preferably, the step of receiving the MBS traffic data comprises the steps of: obtaining the MBS control information by decoding a multicast service control channel (MSCCH); and receiving the MBS data using the obtained MBS control information . ≪ / RTI >

Preferably, the MBS traffic data received from the serving BS in the idle mode is transmitted to the MS through the serving BS after the MS receives the paging message including the MBS traffic data notification, It may be buffered by the paging controller.

According to another aspect of the present invention, there is provided a method for receiving an MBS of a UE transiting to an idle mode, the method comprising: receiving a paging message including an offset indicating when MBS control information is transmitted from a serving BS; Receiving the MBS control information from the serving BS at a time point indicated by the offset, and receiving MBS data from the serving BS using the received MBS control information.

Preferably, the MBS control information includes downlink allocation information of the MBS data and may be transmitted from the serving base station through a multicast service control channel (MSCCH).

Preferably, the paging message including the offset is a paging message transmitted in a paging cycle closest to the MBS service start time among paging cycles that do not exceed the MBS service start time .

Preferably, the paging message including the offset information includes paging messages transmitted in a paging cycle closest to the service start time of the MBS among paging cycles that do not exceed the MBS start time of the MBS, It may be a message.

According to another aspect of the present invention, there is provided a method of receiving an MBS of a UE transited to an idle mode, the method comprising: acquiring MBS service start time information from a serving BS; Receiving MBS control information from the serving BS using an MBS service start time information and receiving MBS data from the serving BS according to the MBS control information at a time indicated by the MBS service start time information .

Preferably, the MBS control information includes downlink allocation information of the MBS data and may be transmitted from the serving base station through a multicast service control channel (MSCCH).

Preferably, the multicast service control channel through which the MBS control information is transmitted may be a multicast service control channel transmitted to the terminal within a predetermined time before the MBS service start time.

Preferably, the multicast service control channel through which the MBS control information is transmitted may be a multicast service control channel transmitted to the terminal at a point of time when the MBS service start time does not exceed the MBS service start time.

Preferably, the MBS service start time is an initial step (MBS service discovery & MBS join) for establishing a connection of the MBS, a dynamic service flow generation process (DSA) for establishing a connection of the MBS, (DREG-CMD) message and a broadcast control channel (BCH).

According to another aspect of the present invention, there is provided an MBS transmission method of an MBS system, including the steps of informing a terminal of MBS start information and transmitting MBS traffic data to the terminal.

Preferably, the MBS system includes a serving base station, a paging controller, and an MBS network, and the MBS traffic may include MBS data and MBS control information indicating downlink allocation information of the MBS data.

Preferably, the step of informing the MBS start information includes transmitting an MBS traffic data indication to the MS by including the MBS traffic data indication in a paging message, and the MBS traffic data is transmitted to the MS The mobile station may be buffered by the serving base station or the paging controller.

Preferably, the step of informing the MBS start information includes an offset indicating a time at which the MBS control information is transmitted to the UE, in a paging message, and transmitting the offset to the UE, And transmitting the information to the terminal.

Preferably, the step of informing the MBS start information includes an MBS service start time, an initial step (MBS service discovery & MBS join) for establishing a connection of the MBS, setting a connection of the MBS (DREG-CMD) message and a broadcast control channel (BCH) in the idle mode entry process.

According to the embodiments of the present invention, the following effects are obtained.

Since the control information of the corresponding MBS can be received from the time when the MBS to be received by the terminal actually starts, it is possible to reduce the power consumption of the terminal by preventing the terminal from receiving other unnecessary control information.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for informing a network of a reception quality of a MBS data and whether a reception state is changed by a terminal.

In the following embodiments, elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

Herein, the embodiments of the present invention have been described with reference to the data transmission / reception relationship between the base station and the terminal. Here, the BS has a meaning as a terminal node of a network that directly communicates with the MS. The specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. The term 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), a base station (BS), an access point, Also, 'serving base station' can be replaced by terms such as Serving BS, SBS, and the like. The term 'terminal' may be replaced with terms such as a user equipment (UE), a mobile station (MS), and a mobile subscriber station (MSS).

Embodiments of the present invention may be implemented by various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, a procedure or a function for performing the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

Multicast and broadcast services (MBS), MBS services (MBS), or multimedia services (MBS)) are associated with service flows. The multimedia service flow is not dedicated to a particular terminal and can be transmitted from the base station to the terminal regardless of the mode of the terminal.

At the start of the service, the base station can establish the MBS service by creating the MBS service flow. In other words, by creating a service flow, the UE can receive data for the BS and the MBS service.

The mapping of the MBS service flow identifier (MBS ID) to the CID is reported to all base stations belonging to the same MBS zone.

When a terminal is registering with a base station to receive an MBS service, the terminal notifies a base station that it is a customer of a specific MBS service by adding a dynamic service addition (DSA) ) Procedure to create a service flow. To this end, the terminal transmits and receives MBS setup information through a message (DSA-REQ and DSA-RSP).

Through the transmission / reception of control information using the messages, the UE acquires an encryption key for MBS data reception and a connection IDentifier (CID) for radio resource mapping. The information thus obtained is used to initiate bidirectional upper layer communication between the base station and the backbone network when the MBS service is configured. If the MBS service is successfully configured, the terminal may reuse the same configuration without reconfiguration when moving to another base station.

FIG. 2 is a flowchart illustrating a process of receiving an MBS at a point of time when a terminal does not enter an idle mode after completion of an MBS connection setup and a predetermined MBS service is started.

Referring to FIG. 2, the MS performs an initial step (MBS Service Discovery & Join) for establishing a connection in order to receive the MBS (S201). Here, the initial step for establishing the MBS connection is a step of acquiring information on a multimedia service desired by the terminal from the MBS network and transmitting a message indicating the reception intention to the MBS network.

Next, if the UE determines to receive a specific MBS service, it can perform a service flow creation procedure using the DSA. For this, the UE can transmit and receive the serving BS and control information through a message (DSA-REQ / RSP / ACK) (S202).

The MBS network knows the MBS service start time (MBS service start time) at which the MS wants to receive the MBS service. When the MBS service is started, the corresponding MBS service is started and related contents or data of the MBS service starts to be transmitted to the network (S203).

The MBS service started through the above process is transmitted to the serving BS in the form of MBS traffic data, and the serving BS can transmit the MBS service to the MS again (S204). Here, the MBS traffic data may include MBS control information that may include MBS data, downlink allocation details of MBS data, and the like. Also, the control information for the MBS service may be transmitted from the serving BS to the MS through a Multicast Service Control Channel (MSCCH) transmitted together with the BCH.

In step S205, the MS receives the MBMS data and decodes the received MSCCH, thereby receiving the MBS data.

However, in the case of the above-mentioned procedure, since the UE continuously wakes up to the MBS start time after the MBS connection setup, there is no problem in receiving the MBS traffic data. However, if the UE enters the idle mode after the MBS connection setup, it is a problem.

Hereinafter, an efficient MBS data reception method in which idle mode entry of a terminal is considered will be described in the first embodiment.

First Embodiment

In the first embodiment of the present invention, upon receiving the MBS after the UE completes the MBS reception setup and enters the idle mode, it notifies the presence of the MBS traffic through the periodically received paging message and receives the MBS control information and MBS data . ≪ / RTI >

3 is a flowchart illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a first embodiment of the present invention. Hereinafter, a first embodiment of the present invention will be described with reference to FIG. For the sake of simplicity of explanation, the duplicate description will be omitted.

Referring to FIG. 3, in step S301, the MS may perform an initial step (MBS Service Discovery & Join) for establishing a connection to receive an MBS.

Next, if the UE determines to receive a specific MBS service, it can perform a service flow creation procedure using the DSA (S302).

Upon completion of the service flow generation procedure, the UE can transmit a DREG-REQ message to the serving BS to transition to the Idle mode. At this time, the DREG-REQ message may include an MBS service retain request for requesting that the paging controller maintain configuration information (hereinafter, referred to as MBS configuration information) related to the MBS service (S303).

In step S303, the serving BS makes a request to maintain the MBS configuration information. Accordingly, the serving base station transmits information about the paging controller and the MBS service such as a multicast connection identifier (MCID), security related information, (MBS_ZONE_ID) and the like (S304).

Accordingly, the paging controller joins the multicast router or maintains the proxy address resolution protocol (Proxy ARP) function to maintain the MBS service configuration information with the MBS network. Can be performed.

Here, ARP refers to a protocol that allows a physical MAC address to be found using a logical IP (logical Internet protocol). Proxy ARP means that the paging controller sends the ARP to the MBS network instead of the MS in order to maintain the connection between the MBS network and the MS. In addition, joining a multicast router means that the paging controller acts as an intermediary for forwarding all other network multicast data belonging to the group's members in one multicast group.

Then, the serving BS can transmit a DREG-CMD message to the MS in response to the DREG-REQ message transmitted by the MS (S305). The serving base station releases resources related to the connection with the terminal and releases the terminal to the idle mode.

The MBS network knows the MBS service start time for the MBS service that the UE desires to receive and waits until that time. The paging controller transmits a paging indication message to the mobile station through the serving base station in order to notify a call or a packet to the mobile station in the idle mode through a broadcast control channel (BCH) Periodically according to the paging cycle of the mobile station. The paging notification message transmitted from the serving BS to the MS may be a paging announcement (MOB_PAG-ADV) message. The terminal transited to the idle mode to receive the signal can receive the signal (S306).

The paging cycle indicates a period in which a UE transited to the idle mode receives a paging indication. If a paging cycle period elapses, the UE transits to the idle mode again and performs a paging indication (S307).

Then, when MBS service start time is reached, the MBS network starts the corresponding MBS service, and the related contents or data of the MBS service starts to be transmitted to the network. The MBS service may be transmitted to the paging controller in the form of MBS traffic data (S308) or may be transmitted to the serving base station (S308_1). The MBS traffic data may include MBS control information and MBS data as described above.

At this time, since the terminal desiring to receive the MBS is in the idle mode, it can not be immediately transmitted to the terminal, so that the MBS traffic data can be buffered by the paging controller or the serving base station (S309).

Accordingly, the paging controller informs the serving base station that there is traffic in the paging indication through the BCH to notify the terminal that has entered the idle mode in the next paging cycle that there is MBS traffic data, (S310).

The terminal in the idle mode, which has received the MBS traffic data, can determine whether there is MBS traffic data notification in the received paging notification. If the MBS traffic data notification exists, it can prepare to receive the MBS traffic data. Accordingly, the paging controller or the serving base station can forward the MBS traffic data stored in step S309 to the terminal (S311).

In the following process, the UE in the idle mode can decode the MSCCH to acquire the control information of the MBS and know the downlink allocation details of MBS data that the UE desires to receive. Accordingly, the terminal can receive the MBS data (S312).

Second Embodiment

In the second embodiment of the present invention, upon receiving the MBS after the UE completes the MBS reception setup and enters the idle mode, the MS acquires the MBS control information through the periodically received paging message and receives the MBS ≪ / RTI >

4 is a flowchart illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a second embodiment of the present invention. Hereinafter, a second embodiment of the present invention will be described with reference to FIG. For simplicity of explanation, a detailed description of the parts overlapping the steps S301 to S307 of FIG. 3 will be omitted.

Referring to FIG. 4, the MS may perform MBS Service Discovery & Join (step S401) to establish a connection to receive MBS.

Next, if the UE determines to receive a specific MBS service, it can perform a service flow creation procedure using the DSA (S402).

Upon completion of the service flow generation procedure, the UE may transmit a DREG-REQ message to the serving BS to transition to the Idle mode (S403). At this time, the DREG-REQ message may include an MBS service retain request for requesting that the paging controller maintain configuration information related to the MBS service.

In step S403, the serving BS makes a request to maintain the MBS configuration information. Accordingly, the serving base station transmits information about the paging controller and the MBS service, such as a multicast connection identifier (MCID), security related information, (MBS_ZONE_ID), an MBS service start time (MBS Service start time), and the like (S404).

Then, the serving BS can transmit a DREG-CMD message to the MS in response to the DREG-REQ message transmitted in step S405. The serving base station releases information related to the connection with the terminal, and the terminal can transition to the idle mode.

The MBS network knows the start time of the MBS service that the UE desires to receive and waits until that time. In step S406, the paging controller may periodically send a paging notification message to the UE according to a predetermined paging cycle through the serving base station, in order to notify a call or a packet to the terminal in the idle mode through the BCH.

When a paging cycle period elapses, the mobile station transiting to the idle mode can receive a paging indication again (S407).

In the process of transmitting the last paging indication before the start of the MBS service start time to the MS, the control information of the MBS required for the MS to receive the MBS service data includes MSCCH It is possible to inform the user of the time point of the transmission. This can be performed by transmitting the paging notification including the MSCCH offset to the MS through the BCH (S408). At this time, the MSCCH offset may be the same as the MBS service start time.

Upon receiving the paging notification including the MSCCH offset, the MS determines whether the MSCCH offset is included in the paging notification. If the MSCCH offset is included in the paging notification, the MS waits for the MSCCH offset.

Since the MSCCH transmitted to the UE along with the BCH does not contain control information for the MBS data that the UE desires to receive during the period before the offset has elapsed, the UE may only receive the BCH and not the MSCCH (S409, S410 ).

When the MBS network reaches the MBS service start time, it starts the corresponding MBS service and starts to transmit the MBS traffic data to the AT through the serving BS (S411).

When the offset has elapsed, the UE can receive the MSCCH transmitted together with the BCH since the control information of the MBS to be received is transmitted through the MSCCH (S412). Therefore, the UE can acquire the control information of the MBS desired to be received and can receive the MBS data from the serving BS using the control information.

Third Embodiment

In the third embodiment of the present invention, when the UE receives the MBS after entering the idle mode after completing the MBS reception setup, it sets the MBS reception or enters the idle mode to acquire the MBS service start time and receive the MBS ≪ / RTI >

Hereinafter, a third embodiment of the present invention will be described with reference to Figs. 5 to 7. Fig.

5 to 7 are flowcharts illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a third embodiment of the present invention.

Referring to FIG. 5, the MS may perform MBS Service Discovery & Join (S501) for connection establishment in order to receive MBS. At this time, the UE can acquire the MBS service start time information for the MBS from the MBS network.

Next, if the UE determines to receive a specific MBS service, it can perform a service flow creation procedure using the DSA (S502).

Upon completion of the service flow generation procedure, the UE can transmit a DREG-REQ message to the serving BS to transition to the Idle mode (S503). At this time, the DREG-REQ message may include an MBS service retain request for requesting that the paging controller maintain configuration information related to the MBS service.

Since the serving base station has requested the MBS setup information retention in the procedure of S503, the serving base station transmits information about the paging controller and the MBS service, for example, multicast connection identifier (MCID), security related information, MBS zone identifier (MBS_ZONE_ID) and the like (S504).

Then, the serving BS can transmit a DREG-CMD message to the MS in response to the DREG-REQ message transmitted by the MS in step S505. The serving base station releases information related to the connection with the terminal, and the terminal can transition to the idle mode.

The MBS network knows the start time of the MBS service that the UE desires to receive and waits until that time. In step S506, the paging controller may periodically send a paging notification message to the mobile station in accordance with a predetermined paging cycle through the serving base station to notify the mobile station of a call or a packet to the terminal in the idle mode through the BCH.

When a paging cycle period has elapsed, the mobile station transiting to the idle mode can again receive a paging indication (S507, S508)

As described above, in order to receive MBS data, the UE must acquire control information of the corresponding MBS through the MSCCH transmitted with the BCH. However, before the MBS service start time arrives, the MSCCH does not include control information for the MBS that the UE desires to receive. Therefore, the UE receives only the BCH and does not receive the MSCCH (S509 and S510).

Thereafter, the serving BS can transmit the control information of the MBS to the MS through the MSCCH in the MSCCH within a predetermined time before the MBS service start time approaches (S511). At this time, it is preferable that the MSCCH to which the control information of the MBS is transmitted is MSCCH that is transmitted together with the BCH transmitted to the MS at the nearest time that does not exceed the MBS service start time.

As the MBS service start time comes, the MBS network can start the corresponding MBS service and transmit the MBS traffic data to the AT through the serving BS (S512). At this time, the MBS traffic data may include control information and MBS data of the corresponding MBS as described above.

Accordingly, the UE can receive the MBS data from the serving BS using the control information of the MBS acquired through the MSCCH. Then, the MS continuously receives the BCH and the MSCCH, and the MBS service can be continued.

Meanwhile, the terminal can acquire the MBS service start time through an initial step (MBS Service Discovery & Join) for connection establishment as well as a service flow generation process using DSA or an idle mode entry step. This will be described with reference to Figs. 6 and 7, respectively.

FIG. 6 is a flowchart illustrating a process of creating a service flow using a DSA according to a third embodiment of the present invention, and FIG. 7 is a flowchart illustrating a process of acquiring an MBS service start time and receiving an MBS through an idle mode entry step .

Referring to FIG. 6, if the UE fails to acquire the MBS service start time in the initial step (MBS Service Discovery & Join) (S601) for MBS connection setup, the MBS service start time Information can be exchanged (S602).

Then, the MS can perform a service flow generation procedure using the DSA for the reception setup of the MBS service. In this case, the serving BS can inform the MS of the MBS service start time acquired by the serving BS in step S602 (step S603) . The MBS service start time may be included in the DSA-RSP message and transmitted from the serving BS to the MS.

Hereinafter, since the UE transmits a DREG-REQ message to enter the idle mode to the serving BS in step S604, the process thereafter is the same as that in step S503 and subsequent steps described with reference to FIG. 5, and description thereof will be omitted.

Referring to FIG. 7, the MS may perform MBS Service Discovery & Join for establishing a connection to receive MBS (S701).

Next, if the UE determines to receive a specific MBS service, it can perform a service flow creation procedure using the DSA (S702).

If the UE fails to acquire the MBS service start time through the two processes, the MBS network can exchange MBS service start time information with the paging controller (S703).

Then, the UE can transmit a DREG-REQ message to the serving BS to transition to the Idle mode (S704). At this time, the DREG-REQ message may include an MBS service retain request requesting that the paging controller maintain configuration information related to the MBS service.

In step S704, the serving BS requests the MBS setup information to be maintained. Therefore, the serving BS transmits information about the paging controller and the MBS service, for example, multicast connection identifier (MCID), security related information, (MBS_ZONE_ID), and so on. At this time, the serving BS can request the paging controller to share the MBS service start time acquired by the paging controller in step S703 (S705). If the step S703 is not performed, the serving BS may request the paging controller to acquire and share the corresponding MBS service start time from the MBS network.

The serving BS can acquire the MBS service start time through the above process, and can transmit the DREG-CMD message to the MS in step S706. The serving base station releases information related to the connection with the terminal, and the terminal can transition to the idle mode.

The processes performed after the UE transitions to the idle mode, including the process of S707, are the same as those of the process of S506 and subsequent steps of FIG. 5, and thus the description thereof will be omitted.

1 shows an example of a procedure in which a UE enters an idle mode and operates in a conventional IEEE 802.16e system.

FIG. 2 is a flowchart illustrating a process of receiving an MBS at a time point at which a predetermined MBS service is started after the terminal completes an MBS connection setup.

3 is a flowchart illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a first embodiment of the present invention.

4 is a flowchart illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a second embodiment of the present invention.

5 is a flowchart illustrating an MBS transmission / reception method in which an idle mode entry of a UE is considered according to a third embodiment of the present invention.

6 is a flowchart illustrating a process of acquiring an MBS service start time and receiving an MBS in a service flow generation process using a DSA according to a third embodiment of the present invention.

7 is a flowchart illustrating a process of acquiring an MBS service start time and receiving an MBS through an idle mode entry step according to the third embodiment of the present invention.

Claims (18)

A method for receiving a Multicast Broadcast Service (MBS) in a terminal in an idle mode, Transmitting a first message including an MBS service retain request requesting the MBS configuration information to be maintained by the paging controller to the serving base station; Receiving a second message from the serving base station in response to the first message, releasing information related to a connection with the serving base station, and transiting to an idle mode; Receiving a paging message according to a predetermined paging cycle from the serving base station; And Receiving MBS traffic data from the serving BS when the received paging message includes an MBS traffic data indicator, Wherein the MBS traffic data is data stored by the paging controller or the serving BS until the paging message including the MBS traffic data notification is received by the MS after being transmitted to the MS through the serving BS. The method according to claim 1, The MBS setting information may include, An MBS zone identifier (MBS_ZONE_ID), security related information, and a multicast connection identifier (MCID). The method according to claim 1, Wherein the MBS traffic data includes MBS data and MBS control information required to receive the MBS data, Wherein the MBS control information is transmitted from the serving BS through a multicast service control channel (MSCCH). The method of claim 3, Wherein the receiving the MBS traffic data comprises: Decoding the multicast service control channel (MSCCH) to obtain the MBS control information; And And receiving the MBS data using the obtained MBS control information. delete A method for receiving a Multicast Broadcast Service (MBS) in a terminal in an idle mode, Transmitting a first message including an MBS service retain request requesting the MBS configuration information to be maintained by the paging controller to the serving base station; Receiving a second message from the serving base station in response to the first message, releasing information related to a connection with the serving base station, and transiting to an idle mode; Receiving a paging message according to a predetermined paging cycle from the serving base station; Receiving the MBS control information from the serving BS at a point indicated by the offset information if the paging message includes offset information indicating a time at which the MBS control information is transmitted from the serving BS; And And receiving MBS data from the serving BS using the received MBS control information. The method according to claim 6, The MBS control information includes: The downlink allocation information of the MBS data, Wherein the MBS is transmitted from the serving BS through a multicast service control channel (MSCCH). 8. The method of claim 7, The paging message, including the offset, Wherein the paging message is a paging message transmitted in a paging cycle closest to the MBS service start time, the paging cycle not exceeding an MBS service start time. 8. The method of claim 7, Wherein the time point indicated by the offset information is the same as the MBS service start time. delete delete delete 10. The method of claim 9, The MBS service start time may be, (MBS service discovery & MBS join) for establishing a connection of the MBS, a dynamic service flow generation process (DSA) for establishing a connection of the MBS, a DREG-CMD message And a broadcast control channel (BCH). A method for transmitting a Multicast Broadcast Service (MBS) in a base station in an idle mode, Receiving from the AT a first message including an MBS service retain request requesting MBS configuration information to be maintained by the paging controller; Transmitting a second message for releasing information related to a connection with the MS to the MS in response to the first message; Transmitting a paging message according to a predetermined paging cycle of the MS, the paging message including an MBS traffic data indicator; Storing MBS data to be transmitted to the MS after transmitting a paging message including the MBS traffic data notification; And And transmitting the stored MBS data to the MS after the paging message is transmitted. 15. The method of claim 14, The MBS setting information may include, An MBS zone identifier (MBS_ZONE_ID), security related information, and a multicast connection identifier (MCID). 16. The method of claim 15, Wherein the MBS traffic data includes MBS data and MBS control information required to transmit the MBS data, Wherein the MBS control information is transmitted to the MS through a multicast service control channel (MSCCH). A method for transmitting a Multicast Broadcast Service (MBS) in a base station in an idle mode, Receiving from the AT a first message including an MBS service retain request requesting MBS configuration information to be maintained by the paging controller; Transmitting a second message for releasing information related to a connection with the MS to the MS in response to the first message; The method comprising: transmitting a paging message according to a predetermined paging cycle of the MS, wherein the paging message includes offset information indicating when the MBS control information is transmitted to the MS; And And transmitting the MBS control information to the MS and transmitting the MBS data at a time indicated by the offset information. 18. The method of claim 17, Wherein the time point indicated by the offset information is the same as the MBS service start time.

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