KR20100045900A - A method for transmitting mbs considering idle mode mobile stations - Google Patents

Abstract

PURPOSE: A method for transmitting MBS considering idle mode mobile stations are provided to receive MBS control information from a actual start timing of MBS, thereby reducing the power usage of terminal. CONSTITUTION: An MS(Mobile Station) transmits a DREG-REQ message to a SBS(Serving Base Station)(S303). The paging controller periodically transmits a paging indication message to the terminal according to a predetermined paging cycle through the SBS(S306). The MBS(Multicast Broadcast Service) transmits to the paging controller as an MBS traffic data form(S308). In other words, the MBS service is transmitted to the SBS(S308_1). The MBS traffic data comprises MBS control information and MBS data.

Description

MBS transmission method considering terminal in idle mode {A METHOD FOR TRANSMITTING MBS CONSIDERING IDLE MODE MOBILE STATIONS}

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.

In a wireless communication network, a terminal receiving a broadcast or MBS service obtains information about a service through higher procedures with a server providing a service to start a service. When the terminal decides to receive the service, the server delivers data to the region to which the terminal belongs. Through the connection procedure with the base station located in the area, the terminal can receive the corresponding service from the base station.

In more detail, 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 a service flow identifier (SF ID) identifying a corresponding service flow between the base station and the MS, a connection identifier (CID) for identifying a connection carrying a service flow traffic, and a security of the service flow. Quality of Service (QoS) parameters related to security information and quality of service to ensure quality.

In general, the service flow is a one-to-one connection between the base station and the MS. However, the MBS used to transmit MBS data in the IEEE 802.16 system features a point-to-multipoint service for transmitting data from one source to multiple receivers. Thus, the base station delivers the same data to multiple MSs through one service flow.

That is, when generating the MBS service flow between the base station and the MS, the base station assigns the same CID to the multiple MSs requesting the reception of the MBS data, thereby allowing the multiple MSs to simultaneously receive the same MBS data. The coverage that can provide services by granting a single CID to multiple MSs is called an MBS zone.

The MBS zone may consist of several base stations, and in one MBS zone, several base stations may provide the same service in multiple cells through one service CID. Because of this feature, MBS generally delivers common data from multiple sources to multiple recipients 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 connection establishment, the user receives 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 sent to a terminal to receive a service from a base station and transmits information for reading a service there. Upon receiving the MBS_MAP message, the UE may check the service point of the MBS through additionally transmitted information such as MBS_DATA_IE or Extended_MBS_DATA_IE.

The MBS_DIUC_Change_Count field may be used to inform the change of burst profile used for multiple base station MBS data. If the MBS_DIUC_Change_Count is changed, the terminal must wait until the DCD message is received unless the downlink burst profile TLV is included in the MBS_MAP.

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

Next, the idle mode will be described.

The idle mode is a mechanism that enables a terminal to periodically receive transmission of downlink broadcast traffic without registering with a specific base station even though the terminal roams a wireless link environment composed of multiple base stations (Multiple BS) over a wide area. That is, the terminal in the idle mode does not have to meet the requirements according to handover or general MAC operation.

However, the terminal in the idle mode may check whether the call is made from the base station at a predetermined time interval. Accordingly, the idle mode provides a simple and reasonable way to inform about pending downlink traffic for the terminal and eliminates the overhead of the network and the base station by eliminating the air interface and network handover traffic from the inactive terminal. To reduce the

In addition, from the terminal's point of view, by limiting the terminal activity to scan in discrete cycles, the terminal can conserve power and operating resources. The idle mode terminal returns all connection identifiers (CIDs), management connection identifiers (MCIDs), and Internet protocol (IP) addresses.

Hereinafter, an example of a procedure in which a terminal enters an idle mode and operates in a conventional IEEE 802.16e system will be described with reference to FIG. 1.

Referring to FIG. 1, first, a UE sends a de-registration request (hereinafter referred to as a "DREG-REQ") message to a serving base station in order to enter an idle mode from a normal mode. Can be transmitted (S110).

The serving base station receiving the DREG-REQ message may exchange information between the terminal and the serving base station to 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 base station, the terminal may confirm that the request for entering the idle mode has been successfully accepted and enter the idle mode (S140).

The paging controller may perform a paging procedure to find the terminal when a call or an external packet for the terminal is received (S150).

Here, the paging procedure is a function for notifying the terminal of the arrival of pending downlink traffic through a base station or a specific network entity for the specific terminal in the idle mode state and transitioning to the normal mode state so that the terminal receives the traffic.

To this end, the paging controller may inform the serving base station of the arrival of the traffic by using the information stored in the process of exchanging information between the terminal and the serving base station (S120). Accordingly, the serving base station may transmit a paging message (MOB_PAG-ADV) indicating the arrival of traffic to the terminal.

When the mobile terminal receives the paging message from the serving base station, when checking the message and paging itself, the mobile station enters a normal mode (S170) and performs communication with the base station (S180). The terminal entering the normal mode may communicate with the base station.

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

However, when transmitting the existing MBS data in a mobile communication network, the modulation and coding scheme (MCS: Modulation and Coding) of the level that the MBS network can receive without error all the terminals receiving the MBS data in the cell (cell) Select and send the scheme.

In this case, the MBS network refers to an entity for distributing MBS data by delivering data from a MBS content provider to a serving base station in charge of a corresponding terminal so that the data can be transmitted to a terminal receiving a service. Say. For example, an MBS server, an MBS gateway, or an MBS controller may be mentioned.

When the terminal receiving the MBS enters the idle mode and the timing at which the actual service starts does not match, the terminal should continuously receive control information about the MBS to be received. This causes a waste of power of the terminal for receiving unnecessary control information, so a more efficient method of transmitting and receiving MBS data is required.

The present invention has been made to solve the problems of the general technology as described above, and to provide control methods for receiving the control information from the time MBS is actually starting to receive the terminal and to provide a method for operating the network for this.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, a method of receiving a multicast broadcast service (MBS) by the terminal in the idle mode according to an embodiment of the present invention requests that the MBS configuration information is maintained by the paging controller 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 the serving base station; It may include receiving the MBS traffic data from the.

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 receiving of the MBS traffic data includes: decoding the multicast service control channel (MSCCH) to obtain the MBS control information; and receiving the MBS data using the obtained MBS control information. It may include.

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

In order to achieve the above technical problem, the MBS reception method of the UE transitions to the idle mode according to another embodiment of the present invention includes the steps of receiving a paging message including an offset indicating when the MBS control information is transmitted from the serving base station; The method may include receiving the MBS control information from the serving base station at the time indicated by the offset, and receiving MBS data from the serving base station using the received MBS control information.

Preferably, the MBS control information may include 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 the paging cycle closest to the MBS service start time in a paging cycle that does not exceed the MBS service start time. Can be.

Preferably, the paging message including the offset information is transmitted to the paging period closest to the service start time of the MBS of the paging cycle (paging cycle) that does not exceed the MBS start time of the MBS It may be a message.

In order to achieve the above technical problem, the MBS receiving method of the terminal transitioned to the idle mode according to another embodiment of the present invention, the process of obtaining MBS service start time (MBS service start time) information from the serving base station, and obtaining Receiving MBS control information from the serving base station by using the MBS service start time information and receiving MBS data from the serving base station according to the MBS control information at the time indicated by the MBS service start time information; Can be.

Preferably, the MBS control information may include 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 the closest time point not exceeding the MBS service start time.

Preferably, the MBS service start time includes 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, and an idle mode entry process. Can be obtained through any one of a Deregistration Command (DREG-CMD) message and a BCH.

In order to achieve the above technical problem, the MBS transmission method of the MBS system according to another embodiment of the present invention may include a step of informing the terminal of the MBS start information and the step of transmitting MBS traffic data to the terminal.

Preferably, the MBS system may include 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 a step of transmitting an MBS traffic data indication (MBS traffic data indication) in the paging message to the terminal, the MBS traffic data is transmitted to the terminal May be buffered by the serving base station or paging controller until now.

Preferably, the step of informing the MBS start information includes the step of transmitting the MBS control information to the terminal by including an offset indicating the time to be transmitted to the terminal and the MBS control at the time indicated by the offset And transmitting information to the terminal.

Preferably, the process of informing the MBS start information includes an initial step (MBS service discovery & MBS join) for establishing an MBS service start time (MBS service start time) and establishing a connection of the MBS. This may be performed through one of a dynamic service flow generation process (DSA) and an idle mode entry process (DREG-CMD) message and a broadcast control channel (BCH).

According to embodiments of the present invention has the following effects.

Since the UE can receive control information of the MBS from the time when the MBS to be actually started starts, it is possible to reduce the power usage of the UE by preventing the UE from receiving other unnecessary control information.

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

The present invention relates to a method for a terminal to inform a network of a change in reception quality and a reception state of MBS data.

The following embodiments are a combination of the components and features of the present invention in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a terminal. Here, the base station has a meaning as a terminal node of the network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A '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, and the like. In addition, the 'serving base station' may be replaced by terms such as Serving BS, SBS. In addition, 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 invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

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

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

Multicast Broadcast Service (MBS: hereinafter referred to as "MBS", "MBS Service" or "Multimedia Service") is associated with the service flow. The multimedia service flow is not used exclusively by a specific terminal and may 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 may set the downlink MBS service by generating an MBS service flow. In other words, by generating a service flow, the terminal can receive data for the base station and the MBS service.

The mapping of the MBS Service Flow Identifier (MBS ID) to the Connection Identifier (CID) is informed to all base stations belonging to the same MBS Zone.

When the terminal is registering with the base station to receive the MBS service, the terminal may notify the base station that it is a customer of a specific MBS service, and the dynamic service addition (DSA) for the MBS service is referred to as "DSA". You must create a service flow through the procedure. To this end, the UE transmits and receives MBS configuration information with the base station through messages DSA-REQ and DSA-RSP.

By transmitting and receiving control information using the messages, the terminal acquires an encryption key for receiving MBS data and a connection identifier (CID) for radio resource mapping. The information obtained as described above is used to initiate bidirectional higher layer communication between the base station and the backbone network when configuring the MBS service. If the MBS service is successfully configured, the terminal may recycle the same configuration without reconfiguration when moving to another base station.

2 is a flowchart illustrating a process of receiving an MBS at a time when a preset MBS service starts without entering an idle mode after the terminal finishes establishing an MBS connection.

Referring to FIG. 2, first, the UE performs an initial step (MBS Service Discovery & Join) for establishing a connection in order to receive an MBS (S201). In this case, the initial step for establishing an MBS connection refers to a step of obtaining information on a multimedia service that a UE wants to receive from an MBS network and transmitting a message indicating a reception intention to the MBS network.

Next, when the UE determines to receive a specific MBS service, the UE may perform a service flow creation procedure using the DSA. To this end, as described above, the terminal may transmit and receive control information with the serving base station through a message (DSA-REQ / RSP / ACK) (S202).

The MBS network waits until the UE knows the start time of the MBS service, that is, the MBS service start time. When the time point at which the MBS service starts is reached, the corresponding MBS service is started and the relevant contents or data of the MBS service starts to be transmitted to the network (S203).

MBS Service started through the above process is transmitted to the serving base station in the form of MBS traffic data (Traffic data), the serving base station can be sent back to the terminal (S204). The MBS traffic data may include MBS control information that may include MBS data and downlink allocation details of MBS data. In addition, the control information for the MBS service may be transmitted from the serving base station to the terminal through a multicast service control channel (MSCCH: hereinafter referred to as "MSCCH") transmitted with the BCH.

In the subsequent process, the UE can know the allocation details of the MBS data intended to be received by the UE by receiving and decoding the MSCCH, through which it can receive the MBS data (S205).

However, in the above-described process, since the UE keeps awake until the MBS start time after establishing the MBS connection, there is no problem in receiving the MBS traffic data, but if the UE enters the idle mode after the MBS connection is established.

Hereinafter, the first embodiment describes an efficient method for receiving MBS data in which the terminal enters the idle mode.

First embodiment

In the first embodiment of the present invention, when the UE enters the idle mode after completing the MBS reception setting and receives the MBS, the MBS control information and the MBS data are received by being notified of the existence of the MBS traffic through a periodically received paging message. Provide a way to.

3 is a flowchart illustrating an MBS transmission / reception method considering entry of an idle mode of a terminal according to the first embodiment of the present invention. Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 3. For simplicity, the description of overlapping parts will be omitted.

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

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

After completing the service flow generation procedure, the terminal may transmit a DREG-REQ message to the serving base station to transition to the idle mode. In this case, the DREG-REQ message may include an MBS service retain request for requesting the paging controller to maintain configuration information related to the corresponding MBS service (hereinafter referred to as "MBS configuration information") (S303).

Since the serving base station has made a request for maintaining the MBS configuration information in step S303, information on the paging controller and the corresponding MBS service, for example, multicast connection identifier (MCID), security related information, and MBS zone identifier (MBS_ZONE_ID) and the like are shared (S304).

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

In this case, ARP refers to a protocol for finding an actual physical MAC address using a logical IP (logical Internet protocol). In addition, Proxy ARP means that the paging controller sends the ARP to the MBS network on behalf of the MS in order to maintain the connection between the MBS network and the terminal. In addition, joining a multicast router means that the paging controller is responsible for forwarding multicast data from one multicast group to all other networks to which the members of the group belong.

Next, the serving base station may transmit a DREG-CMD message to the terminal in response to the DREG-REQ message transmitted by the terminal (S305). The serving base station releases information related to the connection with the terminal (resource & connection release), the terminal may transition to the idle mode.

The MBS network knows a start time (MBS Service Start time) for the MBS service that the UE wants to receive and waits until that time. The paging controller selects a paging indication message through the serving base station to indicate a call or packet for a terminal in idle mode through a broadcast control channel (BCH). Depending on the paging cycle (paging cycle) of the (periodically) can be sent to the terminal. The paging notification message transmitted by the serving base station to the terminal may be a paging announcement (MOB_PAG-ADV) message. The terminal transitioning to the idle mode to receive the signal may receive it (S306).

Paging Cycle refers to a period in which a terminal transitioning to an idle mode receives a paging indication, and when a paging cycle interval elapses, the terminal transitioning to the idle mode again receives paging indication. Can be received (S307).

After that, when the MBS service start time (MBS service start time) is reached, the MBS network starts the MBS service, and the relevant contents or data of the MBS service starts to be delivered 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). MBS traffic data may include MBS control information and MBS data as described above.

In this case, since the terminal wishing to receive the MBS enters the idle mode and cannot be immediately transmitted to the terminal, the corresponding MBS traffic data may be stored by the paging controller or the serving base station (S309).

Accordingly, the paging controller indicates to the serving base station that there is traffic in the paging indication through the BCH in order to inform the terminal that has entered the idle mode in the next paging cycle (MBS traffic data), the UE It can be transmitted to (S310).

Upon receiving this, the terminal in the idle mode may determine whether there is an MBS traffic data notification in the received paging notification, and if the MBS traffic data notification exists, prepare to receive MBS traffic data. Accordingly, the paging controller or the serving base station may transmit the MBS traffic data stored in step S309 to the terminal (S311).

In the subsequent process, the terminal in the idle mode can decode the MSCCH to obtain control information of the MBS as described above, and can know the downlink allocation details of the MBS data intended to be received by the terminal. Through this, the terminal may receive the MBS data (S312).

Second embodiment

In the second embodiment of the present invention, when the UE enters the idle mode after completing the MBS reception setup and receives the MBS, the MBS is obtained by acquiring the time point at which the control information of the MBS is transmitted through a paging message periodically received. Provide a method.

4 is a flowchart illustrating an MBS transmission / reception method considering entry of an idle mode of a terminal 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, a detailed description of parts overlapping with steps S301 to S307 of FIG. 3 will be omitted.

Referring to FIG. 4, first, the terminal may perform an initial step (MBS Service Discovery & Join) for establishing a connection in order to receive the MBS (S401).

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

After completing the service flow generation procedure, the terminal may transmit a DREG-REQ message to the serving base station to transition to the idle mode (S403). In this case, the DREG-REQ message may include an MBS service retain request for requesting the paging controller to maintain configuration information related to the MBS service.

Since the serving base station has made a request for maintaining the MBS configuration information in step S403, information about the paging controller and the corresponding MBS service, for example, multicast connection identifier (MCID), security information, and MBS zone identifier (MBS_ZONE_ID), MBS service start time, etc. are shared (S404).

Next, the serving base station may transmit a DREG-CMD message to the terminal in response to the DREG-REQ message transmitted by the terminal (S405). The serving base station releases information related to the connection with the terminal, and the terminal may transition to the idle mode.

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

When one paging period interval elapses, the terminal transitioning to the corresponding idle mode may receive a paging indication again (S407).

In the paging controller, in the process of delivering the last paging indication before the MBS service start time starts to the terminal, the control information of the MBS required for the terminal to receive the MBS service data is MSCCH. There is a reminder of when it is delivered. This may be performed by the method including the MSCCH offset in the paging notification transmitted through the BCH to the terminal (S408). At this time, the MSCCH offset may indicate the same time as the MBS service start time.

Upon receiving the paging notification including the MSCCH offset, the UE determines whether the MSCCH offset is included in the paging notification. As a result, the terminal waits for the duration of the MSCCH offset.

Since the MSCCH transmitted to the UE together with the BCH during the period before the offset has not elapsed does not include the control information on the MBS data that the UE wishes to receive, the UE may receive only the BCH and not receive the MSCCH (S409, S410). ).

When the MBS network reaches the MBS service start time, the MBS service starts the MBS service and starts transmitting MBS traffic data to the terminal through the serving base station (S411).

The UE may receive the MSCCH transmitted with the BCH when the offset has elapsed since the control information of the MBS desired to be received is transmitted through the MSCCH (S412). Therefore, the terminal can obtain control information of the MBS desired to receive, and can use the same to receive the MBS data from the serving base station.

Third embodiment

According to the third embodiment of the present invention, when the UE enters the idle mode after completing the MBS reception setup and receives the MBS, the MBS service is obtained by receiving the MBS service start time in the process of setting up the MBS reception or entering the idle mode. Provide a method.

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

5 to 7 are flowcharts illustrating an MBS transmission and reception method considering entry of an idle mode of a terminal according to a third embodiment of the present invention.

First, referring to FIG. 5, the terminal may perform an initial step (MBS Service Discovery & Join) for establishing a connection in order to receive the MBS (S501). In this case, the UE may obtain MBS Service Start Time information for the MBS from the MBS network.

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

After completing the service flow generation procedure, the terminal may transmit a DREG-REQ message to the serving base station to transition to the idle mode (S503). In this case, the DREG-REQ message may include an MBS service retain request for requesting the paging controller to maintain configuration information related to the MBS service.

Since the serving base station has made a request for maintaining the MBS configuration information in step S503, information about the paging controller and the corresponding MBS service, for example, multicast connection identifier (MCID), security information, and MBS zone identifier (MBS_ZONE_ID) and the like are shared (S504).

Next, the serving base station may transmit a DREG-CMD message to the terminal in response to the DREG-REQ message transmitted by the terminal (S505). The serving base station releases information related to the connection with the terminal, and the terminal may transition to the idle mode.

The MBS network knows the start time of the MBS service that the terminal desires to receive and waits until that time. The paging controller may periodically send a paging notification message to the terminal according to a predetermined paging period through the serving base station to notify the call or packet to the terminal in the idle mode via the BCH (S506).

When one paging period interval elapses, the terminal transitioning to the corresponding idle mode may receive a paging indication again (S507 and S508).

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

Thereafter, as the serving base station approaches the MBS service start time, the serving base station may transmit control information of the MBS, which the terminal desires to receive to the MSCCH, to the MS through the MSCCH within a predetermined time (S511). In this case, the MSCCH to which the control information of the MBS is transmitted is preferably MSCCH transmitted together with the BCH transmitted to the terminal at the closest time point not exceeding the MBS service start time.

As the MBS service start time arrives, the MBS network may start the corresponding MBS service and transmit MBS traffic data to the terminal through the serving base station (S512). In this case, as described above, the MBS traffic data may include control information and MBS data of the corresponding MBS.

Accordingly, the UE may receive MBS data from the serving base station using control information of the corresponding MBS obtained through the MSCCH. Thereafter, the UE continuously receives the BCH and the MSCCH, and the MBS service may continue.

Meanwhile, the UE may acquire the MBS service start time through not only an initial step for establishing a connection (MBS Service Discovery & Join) but also a service flow generation process or an idle mode entry step using the DSA. This will be described with reference to FIGS. 6 and 7, respectively.

FIG. 6 is a flowchart illustrating a process of receiving an MBS by acquiring an MBS service start time through an idle mode entry step in a UE generating a service flow using a DSA according to a third embodiment of the present invention. .

First, referring to FIG. 6, when the terminal does not acquire the MBS service start time in an initial step (MBS Service Discovery & Join) for establishing an MBS connection (S601), the MBS service start time between the serving base station and the MBS network is determined. Information can be exchanged (S602).

Thereafter, the terminal may perform a service flow generation procedure using the DSA to configure the reception of the MBS service. In this case, the serving base station may inform the terminal of the MBS service start time acquired by the serving base station in step S602 (S603). . The MBS service start time may be included in the DSA-RSP message and transmitted from the serving base station to the terminal.

Hereinafter, since the terminal transmits the DREG-REQ message to enter the idle mode in the serving base station (S604), the subsequent steps are the same as the subsequent steps from S503 described with reference to FIG.

Next, referring to FIG. 7, the terminal may first perform an initial step (MBS Service Discovery & Join) for connection establishment in order to receive the MBS (S701).

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

If the UE has not obtained the MBS service start time through the two processes, the MBS network may exchange MBS service start time information with the paging controller (S703).

Then, the terminal may transmit a DREG-REQ message to the serving base station to transition to the idle mode (S704). In this case, the DREG-REQ message may include an MBS service retain request for requesting the paging controller to maintain configuration information related to the corresponding MBS service.

Since the serving base station has made a request for maintaining the MBS configuration information in step S704, information about the paging controller and the corresponding MBS service, for example, multicast connection identifier (MCID), security related information, and MBS zone identifier (MBS_ZONE_ID) and the like. In this case, the serving base station may request the paging controller to share the MBS service start time acquired by the paging controller in step S703 (S705). If the S703 process is not performed, the serving base station may request the paging controller to acquire and share the corresponding MBS service start time from the MBS network.

The serving base station may acquire the MBS service start time through the above process, and may include the same in the DREG-CMD message and transmit the same to the terminal (S706). The serving base station releases information related to the connection with the terminal, and the terminal may transition to the idle mode.

Since the processes performed after the terminal transitions to the idle mode including the S707 process are the same as those of the S506 process and the subsequent process of FIG. 5, description thereof is omitted.

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

2 is a flowchart illustrating a process of receiving an MBS at a time point when a preset MBS service starts after the UE finishes establishing an MBS connection.

3 is a flowchart illustrating an MBS transmission / reception method considering entry of an idle mode of a terminal according to the first embodiment of the present invention.

4 is a flowchart illustrating an MBS transmission / reception method considering entry of an idle mode of a terminal according to a second embodiment of the present invention.

5 is a flowchart illustrating a method of transmitting / receiving an MBS in consideration of entering an idle mode of a terminal according to a third embodiment of the present invention.

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

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

Claims (18)

In the method for the terminal in the idle mode to receive a multicast broadcast service (MBS), Sending a message to the serving base station, the message including an MBS service retain request requesting that the MBS configuration information be maintained by the paging controller; Receiving a paging message including an MBS traffic data indication from the serving base station; And Receiving MBS traffic data from the serving base station. The method of claim 1, The MBS setting information, And at least one of an MBS zone identifier (MBS_ZONE_ID), security related information, and a multicast connection identifier (MCID). The method of claim 1, The MBS traffic data includes MBS data and MBS control information required to receive the MBS data, The MBS control information, MBS receiving method, characterized in that transmitted from the serving base station via a multicast service control channel (MSCCH). The method of claim 3, wherein Receiving the MBS traffic data, Decoding the multicast service control channel (MSCCH) to obtain the MBS control information; And Receiving the MBS data by using the obtained MBS control information. The method of claim 1, MBS traffic data received by the terminal from the serving base station in idle mode, And after the terminal receives the paging message including the MBS traffic data notification, is stored by a paging controller or the serving base station until it is transmitted to the terminal through the serving base station. In the method for the terminal in the idle mode to receive a multicast broadcast service (MBS), Receiving a paging message including an offset indicating when the MBS control information is transmitted from the serving base station; Receiving the MBS control information from the serving base station at the time indicated by the offset; And Receiving MBS data from the serving base station using the received MBS control information. The method of claim 6, The MBS control information, Including downlink allocation information of the MBS data, MBS receiving method, characterized in that transmitted from the serving base station via a multicast service control channel (MSCCH). The method of claim 7, wherein The paging message including the offset, And a paging message transmitted in a paging cycle closest to the MBS service start time in a paging cycle not exceeding an MBS service start time. In the method of the terminal in the idle mode receives a multicast broadcast service (MBS), Obtaining MBS service start time information from the serving base station; Receiving MBS control information from the serving base station using the obtained MBS service start time information; And Receiving MBS data from the serving base station according to the MBS control information at the time indicated by the MBS service start time information. The method of claim 9, The MBS control information, Including downlink allocation information of the MBS data, MBS receiving method, characterized in that transmitted from the serving base station via a multicast service control channel (MSCCH). The method of claim 10, The multicast service control channel through which the MBS control information is transmitted, And a multicast service control channel transmitted to the terminal within a predetermined time before the MBS service start time. The method of claim 11, The multicast service control channel through which the MBS control information is transmitted, And a multicast service control channel transmitted to the terminal at the closest time point not exceeding the MBS service start time. The method of claim 12, The MBS service start time is Initial step for establishing a connection of the MBS (MBS service discovery & MBS join), dynamic service flow generation process (DSA) for establishing the connection of the MBS, deregistration command (DREG-CMD) message during the idle mode entry process And a broadcast control channel (BCH). In the method for transmitting the MBS to the terminal in the idle mode in the MBS system, Informing the terminal of the MBS start information; And And transmitting MBS traffic data to the terminal. The method of claim 14, The MBS system includes a serving base station, a paging controller and an MBS network, The MBS traffic is, And MBS control information indicating MBS data and downlink allocation information of the MBS data. The method of claim 15, Informing the MBS start information, Including a MBS traffic data indication (MBS traffic data indication) in the paging message and transmitting to the terminal, And the MBS traffic data is buffered by the serving base station or a paging controller before being transmitted to the terminal. The method of claim 15, Informing the MBS start information, Transmitting an offset indicating a time at which the MBS control information is transmitted to the terminal to the terminal in a paging message; And And transmitting the MBS control information to the terminal at the time indicated by the offset. The method of claim 15, Informing the MBS start information, Initial step (MBS service discovery & MBS join) for establishing the MBS service start time (MBS service start time), the dynamic service flow generation process (DSA) for establishing the connection of the MBS, entering idle mode MBS transmission method, characterized in that carried out through any one of a deregistration command (DREG-CMD) message and a broadcast control channel (BCH) in the process.

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