KR20110023796A - Method for transmitting data of multicast broadcast service in mobile wireless connection system - Google Patents

Abstract

PURPOSE: A data transmission method of a multicast broadcast service in a mobile wireless connection system is provided to supply a MBS service through information related to MBS irrelevant to a connection state, an idle state of a terminal. CONSTITUTION: A terminal receives MBS(Multicast Broadcast Service) data in a mobile wireless connection system. A MBS related information of one neighboring base station is received from a serving base station(S210). Handover is performed by a target baste station selected among the neighboring base station from a serving base station(S220). Whether the MBS related information of the serving base station and the MBS related information of the target base station are the same or not is determined(S230). MBS data is received by using MBS related information of the updated terminal. MBS related information of a received neighboring base station includes one between information necessary for an update and all MBS related information of the target base station.

Description

Data transmission method of multicast broadcast service in mobile wireless access system {METHOD FOR TRANSMITTING DATA OF MULTICAST BROADCAST SERVICE IN MOBILE WIRELESS CONNECTION SYSTEM}

The present invention relates to a multicast broadcast service efficiently in a mobile radio access system, and more particularly, to a method for transmitting data of a multicast broadcast service.

3rd Generation Partnership Project (3GPP) long term evolution (LTE) and Institute of Electrical and Electronics Engineers (IEEE) 802.16m are being developed as candidates for the next generation wireless communication system. The 802.16m specification implies two aspects: past continuity, a modification to the existing 802.16e specification, and future continuity, a specification for the next generation of IMT-Advanced systems. Accordingly, the 802.16m standard requires all the advanced requirements for the IMT-Advanced system to be maintained while maintaining compatibility with the Mobile WiMAX system based on the 802.16e standard.

Wireless communication systems generally use one bandwidth for data transmission. For example, the second generation wireless communication system uses a bandwidth of 200KHz ~ 1.25MHz, the third generation wireless communication system uses a bandwidth of 5MHz ~ 10MHz. In order to support increasing transmission capacity, recent 3GPP LTE or 802.16m continues to expand its bandwidth to 20 MHz or more. In order to increase the transmission capacity, it is necessary to increase the bandwidth. However, even when the level of service required is low, supporting a large bandwidth can cause a large power consumption.

The IEEE 802.16m system supports Enhanced Multicast Broadcast Service (E-MBS). E-MBS is a point-to-multipoint system in which data packets are simultaneously transmitted from one source to multiple destinations. Broadcast means the ability to deliver content to all users. Multicast refers to content directed to a specific group of users subscribed to receive a specific service. Static multicast and dynamic multicast may be supported. In the following description, parts described in MBS can be used interchangeably with E-MBS, and are referred to as MBS in the specification.

Meanwhile, the wireless communication system provides a communication service by dividing the service area into a plurality of cells in order to overcome the limitation of the service area and the user capacity. This is called a multi-cell environment. A cell is an area in which a base station provides a communication service, and one base station can provide a service for at least one cell. The UE belongs to one cell, and the cell to which the UE belongs is called a serving cell. Another cell neighboring the serving cell is called a neighbor cell.

The wireless communication system is different from the wired communication system in that it is necessary to provide endless services to mobile terminals. That is, when the terminal moves the position from the serving cell to the neighbor cell, it is necessary to change the moved neighbor cell to the serving cell to provide a continuous service to the terminal. As such, a procedure of changing a serving cell of the terminal due to the movement of the terminal is referred to as handover. It is common for one base station to be in charge of one cell, and the procedure for changing the serving cell of the terminal is generally the same as the procedure for changing the serving base station of the terminal. Therefore, hereinafter, handover will be described as a procedure for changing a serving base station. A new cell to which the terminal moves is called a target cell, and a base station that provides communication service to the target cell is called a target base station. A base station that currently provides communication services is called a serving base station.

In one MBS zone, a user can access MBS services regardless of whether the user is in a connected state or idle state, such as normal mode or sleep mode. Should be available. In other words, in order to receive MBS service, it must be able to receive service without additional registration or procedure. In addition, when a user moves from one MBS zone to another zone, the user must continuously receive the MBS regardless of the user's state.

There is a need for a method for continuously providing an MBS service even when a handover is performed when a user's state is in a connected state or in an idle state.

An object of the present invention is to provide an optimized MBS data transmission method in a connected state or an idle state.

According to an aspect of the present invention, a method for receiving a multicast broadcast service (MBS) data by a terminal in a mobile wireless access system includes receiving MBS related information of at least one neighboring base station from a serving base station; Performing a handover from the serving base station to a target base station selected from the neighbor base station, determining whether MBS related information of the serving base station and MBS related information of the target base station are the same, and determining whether the same is the same And updating the MBS-related information of the terminal on the basis of receiving the MBS data by using the MBS-related information of the terminal on which the update is performed. MBS related information of the neighboring base station and the serving base station At least one of an indication indicating whether the MBS related information is the same (Indication), information that needs to be updated among MBS related information of the serving base station, and all MBS related information of the target base station.

According to another aspect of the present invention, a method for a multicast broadcast service by a serving base station in a mobile wireless access system includes determining whether MBS related information of the serving base station and MBS related information of the target base station are the same; And transmitting MBS related information of the serving base station, wherein the MBS related information of the serving base station indicates whether the MBS related information of the target base station and the MBS related information of the serving base station are the same. ), Information that needs to be updated among MBS related information of the serving base station and at least one of all MBS related information of the target base station.

According to another aspect of the present invention, a method for setting a multicast broadcast service by a terminal in a mobile wireless access system includes performing an MBS location update from a serving base station to a target base station when the terminal is in an idle state. Transmitting a ranging related message including information indicating ranging to the target base station, receiving a ranging response message including MBS related information of the target base station, and MBS related information of the target base station; And updating MBS-related information of the terminal on the basis of receiving the MBS data using the MBS-related information of the terminal on which the update is performed, wherein the MBS-related information of the target base station is determined by the neighboring base station. Whether the MBS-related information and the MBS-related information of the serving base station are the same Includes indication information.

According to the present invention, an MBS service can be efficiently and continuously provided in a mobile wireless access system. When there is an MBS inter-zone handover, the MBS service may be provided through MBS-related information regardless of the connection state and the idle state of the terminal.

1 shows a wireless communication system.
2 is a flowchart illustrating an update of handover and MBS related information in a terminal connected state.
3 is a flowchart illustrating whether to perform an update according to whether MBS related information is identical according to the present invention.
4 is a flowchart illustrating a method of receiving MBS data through MBS location update when there is movement between MBS zones when the terminal is in an idle state.
5 is a flowchart according to an embodiment of MBS location update in an idle state according to the present invention.
6 is a flowchart according to another embodiment of MBS location update in an idle state according to the present invention.
7 is a flowchart according to another embodiment of MBS location update in an idle state according to the present invention.
8 is a flowchart according to another embodiment of MBS location update in an idle state according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

In addition, in describing the component of this specification, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms.

1 shows a wireless communication system. Referring to FIG. 1, the wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors). The mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms. The base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have. Hereinafter, downlink means communication from the base station to the terminal, and uplink means communication from the terminal to the base station. In downlink, a transmitter may be part of a base station and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station. The uplink or downlink packet flow between the base station and the terminal is called a service flow.

MBS has a specific quality of service (QoS) and one service flow, and is mapped to multiple users at the same time to provide MBS services. The user who receives the MBS service sets parameters and service flows to receive the service. The base station that provides the MBS service belongs to a specific MBS zone, and in each MBS zone, common content transmitted to the corresponding service flow is classified by the E-MBS ID and transmitted. The E-MBS ID is a common ID assigned to the user to receive the MBS service. At this time, the MBS content is transmitted to an area divided into one zone, and the MBS zone is divided into a corresponding MBS zone ID. This content has the same channel or service flow ID (FID). At this time, the FID exists in pairs with the corresponding E-MBS ID, which is allocated to each MBS connection. One user can be assigned several FIDs, and MBS contents belonging to one E-MBS ID are transmitted by distinguishing them by FID.

Hereinafter, a method of providing an MBS service in a connected state or an idle state will be described.

First, the case where the terminal is in the connected state will be described.

In the connected state, the terminal receiving the MBS service performs a handover as the location moves. The base station that currently provides the MBS service is a serving base station, and a base station that will receive an MBS service or other service after performing a handover is called a target base station. By comparing the MBS-related information of the serving base station with the MBS-related information of the target base station, it may be determined whether the handover is a handover between different MBS zones or a handover in the MBS zone.

2 is a flowchart illustrating an update of handover and MBS related information in a terminal connected state.

According to FIG. 2, the serving base station transmits MBS related information of a neighbor base station (neighbor BS), which may be a target base station, to the terminal (S210). In this case, instead of transmitting all the MBS related information, only the indication indicating whether the MBS related information of the serving base station and the MBS related information of the target base station are the same or different may be transmitted. If the MBS-related information is the same, since the existing MBS-related information can be used as it is, it is not necessary to receive all the MBS-related information of the neighboring base station. Since the size of the indication information is much smaller than the amount of information when all the MBS related information is transmitted, the amount of data can be reduced.

In addition, all MBS-related information necessary for MBS service among MBS-related information of neighboring base stations may be transmitted, only some information requiring updating among MBS-related information may be transmitted, and the information may be mixed and transmitted. Update indication information indicative of information that needs to be updated for each MBS related information may be transmitted. This is because it is not necessary to transmit the MBS related information by determining whether the MBS related information is the same for each MBS information.

Typical MBS related information that can be updated includes MBS zone ID, E-MBS ID, and FID. Although all of the MBS related information can be updated, only some of them can be updated as necessary. Transmission of the indication information can be made through various methods. Included in a neighbor advertisement (AAI_NBR-ADV in 802.16m of IEEE) message, transmitted in addition to a new MBS-related message, transmitted in addition to an existing MBS-related message, MAC header or It can be transmitted through a dedicated channel.

In order to receive data from the target base station, the terminal performs handover from the serving base station to the target base station (S220). In order to receive MBS data after performing the handover, MBS related information should be set. The terminal may obtain the MBS-related information of the target base station from the received MBS-related information of the neighboring base station, and compares the MBS-related information of the target base station with the MBS-related information of the existing serving base station (S230). At this time, the MBS-related information can be compared, but when receiving the indication information on whether the MBS-related information directly from the serving base station, the indication information can be used, in this case, the process of determining is quick.

If the MBS related information of the target base station is not the same as the MBS related information of the serving base station, the MBS related information is updated (S240). If only the indication information is received, the MBS related information for updating must be additionally received. It may be updated based on the MBS related information of the target base station included in the MBS related information of the neighboring base station. If the MBS-related information of the target base station is the same as the MBS-related information of the serving base station, since no update is necessary, the MBS-related information of the existing base station is set to be the same. MBS data is received from the target base station based on the updated MBS related information (S250) to continuously perform the MBS service.

3 is a flowchart illustrating whether to perform an update according to whether MBS related information is identical according to the present invention.

According to FIG. 3, the terminal receives MBS related information of the neighboring base station from the serving base station (S310). At this time, the reception of the MBS-related information of the neighboring base station may fail, in this case, it is determined whether the terminal successfully received the MBS-related information of the neighboring base station (S320).

If the MBS related information of the neighbor base station is successfully received, the terminal compares the MBS related information of the target base station, which is selected from the neighbor base stations and performs the handover, with the MBS related information of the serving base station (S330). In particular, the information on the MBS zone can be compared, because when the information of the MBS zone such as MBS zone ID is the same, other MBS related information such as E-MBS ID, FID is often the same.

If the handover is performed in the same MBS zone, the terminal receiving the MBS service through the serving base station does not need to update the MBS related information in most cases, and thus, the terminal receives the MBS related information of the existing serving base station. It maintains as it is (S340). In the handover process, the MBS related information of the serving base station may be included in the handover related message and transmitted. On the other hand, when handover is performed between different MBS zones, the terminal receiving the MBS service through the serving base station may need to update MBS related information. In this case, the terminal is associated with the MBS of the existing serving base station. The information is updated with the contents of the MBS related information of the new target base station (S350). In the handover process, the MBS related information of the target base station may be included in the handover related message and transmitted.

 On the other hand, the terminal may not successfully receive the MBS related information of the neighbor base station. When the terminal does not receive the MBS information of the neighbor base station in advance, it may be impossible to update the MBS information of the target base station through the existing handover related message. The same is true when the base station does not predict the handover of the terminal. In this case, when the UE performs the handover, the UE includes MBS related information of the existing serving base station in the handover related message. The target base station compares its own MBS-related information with the MBS-related information of the serving base station, and determines whether the target base station is the same (S360).

If the MBS-related information of the target base station and the MBS-related information of the serving base station are the same, the terminal maintains it without having to update the MBS-related information (S370). However, when the MBS related information of the target base station and the MBS related information of the serving base station are not the same, the terminal updates the MBS related information (S380).

As such, when the terminal does not successfully receive the MBS-related information of the neighboring base station, the terminal does not have MBS-related information about the target base station and performs an unexpected handover. When the terminal performs the ranging with the target base station after performing the handover, an unexpected handover was performed during the MBS service in the ranging related message and transmitted to the base station including information indicating that the MBS related information needs to be updated. do. For example, you can include a message like "unprepared handover with MBS service". At this time, the MBS-related information of the MBS-related service currently received may be informed. The base station receiving the ranging related message may transmit the MBS related information to be updated along with the ranging response message, so that the terminal may perform the update and perform the continuous MBS service.

When the terminal maintains or updates the MBS related information and completes the setting of the MBS related information, the terminal receives the MBS data based on the set MBS related information (S390).

There are various methods for receiving MBS related information of the base station. How to include in the handover related message when updating the handover and update it, receive new MBS related message before performing the handover, during the handover or after performing the handover, A method of receiving through a MAC header, a method of receiving MBS related information through a control channel, and a method of receiving when performing ranging with a target base station after performing a handover may be performed. Each of these methods may be performed independently and may be performed in combination.

When the MBS related information of the neighboring base station is informed through a neighbor advertisement message, it can be transmitted to all MBS related terminals of the neighboring base station. In this case, when adding a new message or performing a handover, the MBS related to the target base station You can receive MBS service without having to update the information. However, if only part of MBS-related information or MBS-related information of the serving base station and MBS-related information of the target base station are informed whether only the indication information is transmitted, that is, only the indication information is transmitted, the MBS-related information is updated when the handover is performed. do.

If the serving base station and the target base station provides the MBS service in the same MBS zone, the same MBS zone information may be used, and a different update may not be necessary. However, it may be necessary to update the information of all MBS zones except the MBS zone ID, or only update the information of a part of the MBS zone. On the other hand, if the serving base station and the target base station provides MBS services in different MBS zones, only the MBS zone ID may be different, and other MBS related information may not need updating. However, it may be necessary to update the information of all MBS zones including the MBS zone ID, or to update the information of a part of the MBS zones including the MBS zone ID.

Secondly, a case in which the terminal is in an idle state will be described.

When the UE moves between the MBS zones in the idle state, the UE may transition to the connected state and perform the handover process described above. In addition, MBS-related information may be updated and continuous MBS service may be received by performing MBS location update without transitioning to the connected state.

MBS location update occurs mainly when there is no mapping information on the MBS zone and the E-MBS ID for the base station to perform the location update.

FIG. 4 is a flowchart illustrating a method of receiving MBS data through MBS location update when there is an inter-MBS movement when the terminal is in an idle state.

According to FIG. 4, a terminal that wants to perform MBS location update transmits a ranging request message (S410), wherein the ranging request message indicates that the purpose of ranging is MBS location update for MBS service. May contain information. The terminal receives a ranging response message including MBS related information about the MBS to be received from the base station (S420). In this case, the MBS related information may include an E-MBS ID, an MBS zone ID, and an FID. The MBS-related information of the terminal is updated based on the received MBS-related information (S430).

5 is a flowchart according to an embodiment of MBS location update in an idle state according to the present invention.

As described above, the ranging request message should be transmitted and the ranging response message should be received for the MBS location update. Prior to this, the terminal may receive a paging advertisement message (PAG-ADV) from the base station (S510). The PAG-ADV message may include MBS related information for which the UE currently receives a service. In particular, the PAG-ADV message generally includes MBS zone information. Subsequently, the terminal transmits a ranging request message (RNG-REQ) to the base station. At this time, the UE may transmit the indication information indicating whether the MBS zone received from the base station is the same as the existing MBS zone or the indication information indicating that the MBS needs to be updated (S520). Next, a ranging response message (RNG-RSP) is received from the base station, and the RNG-RSP message includes MBS-related information requested by the terminal (S530). The MBS related information may include an E-MBS ID, an FID, an MBS zone ID, and the like. If the MBS-related information is the same through the indication information transmitted by the UE, the RNG-RSP does not need to include all the MBS-related information. Send all related information or all MBS related information.

6 is a flow chart according to another embodiment of MBS location update in an idle state according to the present invention.

In the embodiment according to FIG. 6, similar to the embodiment according to FIG. 5, the base station transmits a PAG-ADV message to the terminal (S610). However, rather than including the indication information in the RNG-REQ message, the MBS-related information includes all the information or only the information to be updated (S620). In this case, there is a difference in that the terminal transmits all the MBS related information, and the base station can compare whether the MBS related information of the base station is identical to the MBS related information of the existing terminal. Subsequently, the base station transmits the MBS-related information to the terminal to update the MBS-related information (S630).

7 is a flowchart illustrating another embodiment of MBS location update in an idle state according to the present invention.

In the embodiment according to FIG. 7, similar to the embodiment according to FIG. 5, the base station transmits a PAG-ADV message to the terminal (S710). However, there is a difference in not only including the indication information in the RNG-REQ message but also including MBS related information (E-MBS ID, FID and MBS zone ID) (S720). In this case, the base station may determine whether the MBS-related information is the same through the indication information received from the terminal, or the base station may determine whether the MBS-related information of the base station and the MBS-related information of the existing terminal are the same. There is a difference in that. Subsequently, the base station transmits the MBS-related information to the terminal to update the MBS-related information (S630).

8 is a flowchart according to another embodiment of MBS location update in an idle state according to the present invention.

According to FIG. 8, the base station transmits MBS related information of the neighboring base station to the terminal (S810). The terminal transmits the indication information indicating whether the MBS related information of the neighboring base station is the same as the MBS related information to the base station, and also transmits MBS related information (E-MBS ID, FID and MBS zone ID) (S820). Subsequently, the base station transmits an OK / NON OK message indicating whether it is okay or not to maintain the existing MBS-related information based on the indication information received from the terminal, instead of transmitting all of the MBS-related information to indicate whether an update is required. Here, the OK message is sent when no update is required, and the NON OK message is sent when an update is needed. If the bitmap is set to 1, the OK / NON message needs to be updated when the bitmap is set to 1, and if the bit is set to 0, the terminal already has or does not need information to be updated.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (13)

A method for a terminal to receive Multicast Broadcast Service (MBS) data in a mobile wireless access system,
Receiving MBS related information of at least one neighbor BS from a serving BS,
Performing a handover from the serving base station to a target BS selected from the neighbor base stations;
Determining whether MBS related information of the serving base station and MBS related information of the target base station are the same;
Updating the MBS-related information of the terminal based on a result of determining whether the same is the same; And
Receiving the MBS data using the MBS-related information of the terminal where the update is performed,
The received MBS-related information of the neighboring base station includes information indicating whether the MBS-related information of the neighboring base station and MBS-related information of the serving base station are the same, and information that needs to be updated among the MBS-related information of the serving base station. And at least one of all MBS related information of the target base station. The method of claim 1,
The received MBS related information of the neighboring base station further includes update indication information indicating whether there is information to be updated among MBS related information of the serving base station,
MBS data receiving method for updating the information that needs to be updated by using the update indication information. The method of claim 1,
And the indication information is indication information indicating whether the MBS zone ID of the MBS related information of the neighboring base station is the same as the MBS zone ID of the serving base station. The method of claim 1,
If the MBS related information of the target base station and the MBS related information of the serving base station are the same, the handover related message transmitted when the handover is performed further includes MBS related information of the serving base station;
MBS-related information of the terminal to maintain the MBS-related information of the serving base station, MBS data receiving method. The method according to claim 1,
If the MBS related information of the target base station and the MBS related information of the serving base station are not the same, the handover related message transmitted when the handover is performed further includes MBS related information of the target base station;
And updating the MBS-related information of the terminal based on the MBS-related information of the target base station. The method of claim 1,
MBS-related information of the serving base station, MBS-related information of the target base station, MBS-related information of the neighboring base station and MBS-related information of the terminal each include at least one of MBS zone ID, E-MBS ID, FID, MBS How to receive data. The method of claim 1,
If the terminal is not successful in receiving the MBS related information of the neighboring base station,
The handover related message transmitted when the handover is performed includes MBS related information of the serving base station,
And receiving, from the serving base station, indication information indicating whether the MBS related information of the target base station and the MBS related information of the serving base station are the same. A method for a serving base station to provide a multicast broadcast service (MBS) in a mobile wireless access system,
Determining whether MBS-related information of the serving base station and MBS-related information of the target base station are the same; And
Transmitting MBS related information of the serving base station to a terminal;
MBS-related information of the serving base station is an indication indicating whether or not the MBS-related information of the target base station and MBS-related information of the serving base station (indication), information that needs to be updated among the MBS-related information of the serving base station and the And at least one of all MBS related information of the target base station. The method of claim 8,
MBS-related information of the serving base station, MBS-related information of the target base station, MBS-related information of the neighboring base station and MBS-related information of the terminal may each include at least one of MBS zone ID, E-MBS ID, and Flow ID (FID). Including, MBS method. The method of claim 8,
The instruction information is,
MBS method, MB management message, MBS related message, MAC header (MAC header) and transmitted in the at least one of the dedicated channel, MBS method. A method for a terminal to receive Multicast Broadcast Service (MBS) data in a mobile wireless access system,
When the terminal is in the idle state, a ranging related message including information indicating that the ranging is for performing an MBS location update from a serving base station to a target base station is transmitted to the target base station. Steps,
Receiving a ranging response message including MBS related information of the target base station;
Updating MBS-related information of the terminal based on MBS-related information of the target base station; And
Receiving the MBS data using the MBS-related information of the terminal where the update is performed,
The MBS-related information of the target base station includes MBS information indicating whether the MBS-related information of the neighboring base station and MBS-related information of the serving base station is the same. The method of claim 11,
And receiving a paging advertisement message from the base station including the MBS zone information of the target base station before transmitting the ranging related message to the target base station. . The method of claim 11,
MBS-related information of the target base station, MBS-related information of the neighboring base station, MBS-related information of the serving base station and MBS-related information of the terminal each includes at least one of an E-MBS ID, MBS zone ID, and FID. How to receive data.

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