WO2011087253A2

WO2011087253A2 - Method and apparatus for updating multicast and broadcast service

Info

Publication number: WO2011087253A2
Application number: PCT/KR2011/000183
Authority: WO
Inventors: 김은경; 차재선; 정수정; 장성철; 임광재; 이현; 윤철식
Original assignee: 한국전자통신연구원
Priority date: 2010-01-12
Filing date: 2011-01-11
Publication date: 2011-07-21
Also published as: WO2011087253A3

Abstract

When MBS information is updated, a base station transmits a first message which comprises: a service flow update identifier that identifies a method for expressing the current MBS identifier and flow identifier to be updated; information on the current MBS identifier and flow identifier expressed according to the method identified by the service flow update identifier; and new MBS information. A terminal transmits a second message to the base station in response to the first message.

Description

Method and apparatus for renewing multicast and broadcast service

The present invention relates to a multicast and broadcast service (MBS) update method and apparatus.

MBS is a point-to-multipoint transmission method that simultaneously transmits data packets from one source to a plurality of destinations. The broadcast service refers to a service transmitted to all terminals, and the multicast service refers to a service transmitted to a terminal of a specific group.

The MBS has a specific QoS parameter and one service flow, and these QoS parameters and service flows are simultaneously mapped to multiple terminals so that the MBS is serviced. The terminal receiving the MBS sets a corresponding QoS parameter and service flow in order to receive the corresponding service. The base station serving the MBS belongs to a specific MBS zone, and transmits the common content transmitted to the corresponding service flow in each MBS zone by distinguishing the identifier (MBS ID). The MBS ID is a common identifier (ID) assigned to the terminal to receive the MBS. In this case, the MBS content is transmitted to an area divided into one zone, and the MBS zone is divided into a zone ID. The content has the same channel or service flow identifier (FID). At this time, the FID exists in pairs with the corresponding MBS ID and is allocated to each MBS connection. One terminal may be assigned several FIDs, and MBS content belonging to one MBS zone is transmitted by being distinguished by FID.

In one MBS zone, the UE may select the MBS regardless of whether the UE is in a connected state (including a normal mode and a sleep mode) or an idle state (a state including an idle mode). Service must be continued.

The problem to be solved by the present invention is to provide an MBS update method and apparatus that can receive the MBS regardless of the state.

According to one aspect of the invention, a method of updating an MBS at a base station is provided. The MBS update method may include: a service flow update indicator indicating a method for representing a current MBS identifier and a flow identifier to be updated when MBS information is updated, and the current represented by a method indicated by the service flow update indicator And transmitting a first message including information on the MBS identifier and the flow identifier, and new MBS information to the terminal, and receiving a second message from the terminal in response to the first message.

In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier may be the current MBS identifier and the flow identifier. If the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier may be an index of a combination of the current MBS identifier and the flow identifier.

The index may be defined in a bitmap form in which a plurality of MBS identifiers and flow identifier combinations are arranged in a predetermined order and respectively correspond to a plurality of bits.

A value of a bit corresponding to the current MBS identifier and flow identifier combination among the plurality of bits may be '1'.

The new MBS information may include a new MBS identifier and a flow identifier mapped to the current MBS identifier and a flow identifier.

When the MBS service flow is updated, the MBS zone may be updated, and the new MBS information may include a new MBS zone identifier.

The first message may further include a current MBS zone identifier.

If the carrier supported in the new MBS zone is different from the carrier supported in the current MBS zone, the first message may further include carrier information supported in the new MBS zone.

The first message may further include information about a change time of a carrier.

MBS update method of the base station according to another aspect of the present invention, receiving a ranging request (RNG-REQ) message from the terminal, and when the MBS information is updated, a service flow update indicator, the service flow update And transmitting a ranging response (RNG-RSP) message including information on a current MBS identifier and a flow identifier to be updated and new MBS information expressed according to the value of the indicator to the terminal. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

According to another aspect of the present invention, the MBS update method of the base station, receiving a dynamic service change request (DSC-REQ) message from the terminal, and when the MBS information is updated, the service flow update indicator, A dynamic service change response (DSC-RSP) message including the current MBS identifier to be updated, information on the flow identifier, and new MBS information expressed according to the value of the service flow update indicator is transmitted to the terminal. It includes a step. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

The MBS update method of the base station according to another aspect of the present invention, when the MBS information is updated, the information on the service flow update indicator, the current MBS identifier to be updated and the flow identifier expressed according to the value of the service flow update indicator And transmitting a DSC-REQ message including the new MBS information to the terminal, and receiving a DSC-RSP message from the terminal. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

According to another feature of the present invention, a method of updating an MBS in a terminal is provided. The MBS update method may include: a service flow update indicator indicating a method for representing a current MBS identifier and a flow identifier to be updated when MBS information is updated, and the current represented by a method indicated by the service flow update indicator Receiving a first message from the base station, the first message including information on the MBS identifier and the flow identifier of the new MBS information, and transmitting a second message to the base station in response to the first message.

MBS update method of the terminal according to another aspect of the present invention, the step of transmitting the RNG-REQ message to the base station, and when the MBS information is updated, the service flow update indicator, expressed according to the value of the service flow update indicator And receiving from the base station an RNG-RSP message including information on the current MBS identifier and flow identifier to be updated and new MBS information. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

MBS update method of the terminal according to another aspect of the present invention, the step of transmitting a DSC-REQ message to the base station, and when the MBS information is updated, the service flow update indicator, expressed according to the value of the service flow update indicator And receiving from the base station a DSC-RSP message containing information on the current MBS identifier and flow identifier to be updated and new MBS information. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

MBS update method of the terminal according to another aspect of the present invention, when the MBS information is updated, the service flow update indicator, information on the current MBS identifier and flow identifier to be expressed according to the value of the service flow update indicator And receiving a DSC-REQ message including new MBS information from the base station, and transmitting a DSC-RSP message to the base station. In this case, when the service flow update indicator has a first value, the information on the current MBS identifier and the flow identifier is the current MBS identifier and the flow identifier. And when the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index of a combination of the current MBS identifier and the flow identifier.

According to an embodiment of the present invention, even if the MBS information is updated, the MBS may be continuously provided through the MBS update request message regardless of the state of the terminal.

1 is a schematic flowchart of an MBS supporting method according to an embodiment of the present invention.

2 is a schematic flowchart of an MBS update method according to an embodiment of the present invention.

3 is a diagram illustrating an MBS update request message according to an embodiment of the present invention.

4 is a schematic block diagram of an MBS updating apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, a terminal may be a mobile terminal (MT), a mobile station (MS), a subscriber station (SS), a portable subscriber station (PSS), an access terminal (access) terminal, AT, user equipment (UE), etc., and may include all or part of the functions of the MT, MS, SS, PSS, AT, UE, and the like.

In addition, the base station (BS) is a node B (eB), an evolved node B (eNodeB), an access point (AP), a radio access station (radio access station (RAS)), a base transceiver station may refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like, and may include all or a part of functions of a NodeB, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, and the like.

Referring to FIG. 1, the terminal transmits information on the MBS mode supported by the terminal to the base station, and the base station transmits information on the MBS mode supported by the terminal to the terminal (S110). Through this process, the base station and the terminal exchange for MBS capability (capability). In this case, the terminal may transmit the MBS mode information by using a registration request (REG-REQ) message for the registration request when the network enters or re-entry, the base station is a response message (registration response, REG-REQ message) MBS mode information can be transmitted using a REG-RSP) message.

Next, the base station transmits a message including the MBS parameter to the terminal for establishing the MBS connection, and the terminal transmits a response message to the base station (S120). The response message may also include MBS parameters. These MBS parameters may include MBS service flow parameters, MBS zone IDs, and MBS carrier information used for MBS. The MBS service flow parameter includes an MBS ID (MBS ID) for identifying the MBS and an MBS service flow identifier (FID) that is present in pairs with the MBS ID.

In this case, the base station may transmit a MBS parameter to the terminal using a dynamic service addition request (DSA-REQ) message, the terminal is a dynamic service addition response (dynamic service addition response) in response to the DSA-REQ message response, DSA-RSP) messages can be used. On the other hand, the UE may start the MBS connection establishment request, in this case, the terminal may transmit a DSA-REQ message to the base station, the base station may transmit a DSA-RSP message to the terminal.

As such, after the MBS connection is established through the DSA-REQ / RSP message exchange, the MBS is provided from the base station (S150).

When the MBS is provided through the multi-carrier, after the MBS connection is established, the terminal can perform carrier switching (S130). In this case, the terminal transmits an MBS report (MBS report, MBS-REP) message reporting a carrier change to the base station, and receives a response (MBS response, MBS-RSP) message to the MBS-REP message from the base station (S140) ), The MBS is provided (S150). In this case, the UE transmits an MBS-REP message to the base station so as to request the base station to start the change of the MBS carrier or to terminate the change of the MBS carrier without releasing the MBS connection (that is, returning to the main carrier). The base station can be notified.

After the MBS service flow is set through this procedure, the MBS service flow may be changed. Hereinafter, the MBS update method when the MBS service flow is changed will be described in detail with reference to FIGS. 2 and 3.

2 is a schematic flowchart of an MBS update method according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an MBS update request message according to an embodiment of the present invention.

First, when the MBS service flow is changed, 1) only the MBS zone is changed, and the MBS ID and the FID are not changed, 2) when both the MBS zone and the MBS ID and the FID are changed, and 3) the MBS zone is not changed. Rather, there may be a case where the MBS ID and the FID are changed.

When the MBS service flow is changed in this manner, the base station 200 recognizes the change of the MBS information of the current MBS zone and / or the neighboring MBS zone (S210). The base station 200 transmits a message requesting the update of the MBS to the terminal 100 in order to update the MBS information of the terminal 100 (S220). The terminal 100 transmits a response message to the base station 200 in response to the request message (S230). As such, the terminal 100 and the base station 200 may update the MBS information through the exchange of the MBS update request / response message.

In this case, a medium access control (MAC) control message may be used as the MBS update request / response message. For example, a dynamic service change request (DSC-REQ) message may be used as an MBS update request message, and a dynamic service change response (DSC-) may be used as a response message to a DSC-REQ message. RSP) message may be used.

Meanwhile, during handover, the terminal may transmit a ranging request (RNG-REQ) message to the target cell to the base station and receive a ranging response (RNG-RSP) message from the base station. In addition, the idle mode terminal may transmit an RNG-REQ message for location update to the base station, and receive the RNG-RSP message to the base station. In this case, the base station may update the MBS of the terminal by using the RNG-RSP message as the MBS update request message. In addition, an acknowledgment (ACK) message transmitted by the UE in acknowledgment of the RNG-RSP message may be used as the MBS update response message.

Meanwhile, by transmitting the service flow information of the neighbor zone in the MBS configuration (MBS configuration, MBS-CFG) message, the UE receives the MBS-CFG message when the cell is changed or when the lifetime of the MBS information expires. By doing this, the MBS information can be updated.

Referring to FIG. 3, the MBS update request message includes a current MBS Zone ID (MBS Zone ID), ie, an MBS Zone ID valid for the current connection, to indicate the current MBS zone, and the MBS update request when the MBS zone is changed. The message further includes a new MBS Zone ID.

When the carrier used in the new MBS zone ID is different from the carrier used in the current MBS zone ID when the MBS zone is changed, the MBS update request message is a carrier information supported by the new MBS zone ID, that is, a carrier index. It includes.

When the MBS service flow parameter is changed, the MBS update request message includes current service flow information and service flow information to be changed. At this time, in order to indicate the current service flow information, the index corresponding to the sorted order by directly using the current MBS ID and FID and sorting the combination of MBS ID and FID in a certain order (for example, ascending or descending order). There is a way to use it. Therefore, the MBS update request message includes a service flow update indicator indicating which of the two methods is used. That is, it can be distinguished which of the two methods is used as the value of the service flow update indicator.

When using the current MBS ID and FID, the MBS update request message includes the current MBS ID and FID (Current MBS ID, Current FID) and the new MBS ID and FID (New MBS ID, New FID) mapped thereto. .

When using the index of the MBS ID and FID combination, the MBS update request message includes the index of the current MBS ID and FID combination and the new MBS ID and FID mapped thereto. In this case, a service flow update bitmap defined as a bitmap may be used as an index. Each bit of the service flow update bitmap composed of a predetermined number of bits (for example, 16 bits) corresponds to the MBS ID and FID combination, and the value of the bit corresponding to the MBS ID and FID combination to be changed may be set to one. have.

The MBS update request message may further include a transmission period / transmission area of the control information.

In addition, when the terminal receives the MBS through the carrier change, the MBS update request message may further include a carrier change time. The change point of the carrier includes at least one of a change point of the MBS carrier and a return point of the main carrier. The carrier change time may be allocated for each MBS zone or may be allocated for each terminal regardless of the MBS zone. When the UE requests a carrier change in an MBS-REP message, the BS transmits an MBS-RSP message to the UE, or the base station transmits an MBS-RSP message to the UE without the request of the UE, thereby informing the UE of the carrier change time. Can be.

Meanwhile, the MBS update request message may include only new MBS information to be changed and may not include current MBS information. Then, the current value of the MBS information can be replaced with a new value.

2 and 3 described above, the base station transmits the MBS update request message to the terminal. However, the terminal may request the base station to update the MBS. In this case, the terminal requests the MBS update to the base station through the DSC-REQ message described above, and the base station may transmit a DSC-RSP message to the terminal in response. At this time, the DSC-RSP message includes information corresponding to the MBS update request message described above. In addition, the registration response (REQ-RSP) message described in FIG. 1 may be used as the MBS update request message.

As such, even if the MBS information is updated, the MBS may be continuously provided through the MBS update request message regardless of the state of the terminal.

Next, an MBS updater capable of performing an MBS update method according to an embodiment of the present invention will be described with reference to FIG. 4.

Referring to FIG. 4, the MBS updater 400 includes a message generator 410 and a transceiver 420. The message generator 410 generates an MBS information update request message when the MBS service flow is changed, and the transceiver 420 transmits an MBS information update request message to another node and receives an MBS information update response message from another node. do. When the MBS update apparatus 400 is included in the base station 200 When the transceiver 420 transmits an MBS information update request message to the terminal 100, and the MBS update apparatus 400 is included in the terminal 100. The transceiver 420 transmits an MBS information update request message to the base station 200.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

A method of updating a multicast and broadcast service (MBS) at a base station,

A service flow update indicator indicating a method for representing a current MBS identifier and a flow identifier to be updated when the MBS information is updated, the current MBS identifier and a flow identifier expressed according to the method indicated by the service flow update indicator Transmitting a first message including information about the new MBS information to the terminal, and

Receiving a second message in response to the first message from the terminal;

MBS update method comprising a.
In claim 1,

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
In claim 2,

And the index is defined in a bitmap form in which a plurality of MBS identifiers and flow identifier combinations are arranged in a predetermined order and respectively correspond to a plurality of bits.
In claim 3,

And a bit value corresponding to the combination of the current MBS identifier and the flow identifier among the plurality of bits is '1'.
In claim 1,

And the new MBS information includes a new MBS identifier and a flow identifier mapped to the current MBS identifier and a flow identifier.
In claim 1,

The case in which the MBS service flow is updated includes a case in which an MBS zone is updated.

The new MBS information includes a new MBS zone identifier.

How to update MBS.
In claim 1,

And the first message further comprises a current MBS zone identifier.
In claim 1,

If the carrier supported in the new MBS zone is different from the carrier supported in the current MBS zone, the first message further includes carrier information supported in the new MBS zone.
In claim 1,

The first message further includes information on a change time of the carrier.
A method of updating a multicast and broadcast service (MBS) at a base station,

Receiving a ranging request message from a terminal, and

When the MBS information is updated, a ranging response message including a service flow update indicator, information on a current MBS identifier and a flow identifier to be updated and new MBS information, expressed according to the value of the service flow update indicator, is transmitted to the terminal. Sending steps

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
A method of updating a multicast and broadcast service (MBS) at a base station,

Receiving a dynamic service change request message from a terminal, and

When the MBS information is updated, the terminal receives a dynamic service change response message including a service flow update indicator, information on a current MBS identifier and a flow identifier to be updated, and new MBS information expressed according to a value of the service flow update indicator. To send to

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
A method of updating a multicast and broadcast service (MBS) at a base station,

When the MBS information is updated, a dynamic service change request message including a service flow update indicator, information on a current MBS identifier and a flow identifier to be updated, and new MBS information expressed according to the value of the service flow update indicator, is transmitted to the terminal. Transmitting, and

Receiving a dynamic service change response message from the terminal

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
A method for updating a multicast and broadcast service (MBS) in a terminal,

A service flow update indicator indicating a method for representing a current MBS identifier and a flow identifier to be updated when the MBS information is updated, the current MBS identifier and a flow identifier expressed according to the method indicated by the service flow update indicator Receiving a first message from the base station, the first message comprising information about the new MBS information and

Sending a second message to the base station in response to the first message

MBS update method comprising a.
A method for updating a multicast and broadcast service (MBS) in a terminal,

Transmitting a ranging request message to a base station, and

When the MBS information is updated, a ranging response message including a service flow update indicator, information on the current MBS identifier and flow identifier to be updated and new MBS information expressed according to the value of the service flow update indicator, is received from the base station. Receiving Step

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
A method for updating a multicast and broadcast service (MBS) in a terminal,

Sending a dynamic service change request message to the base station, and

When the MBS information is updated, the base station receives a dynamic service change response message including a service flow update indicator, information on a current MBS identifier and a flow identifier to be updated, and new MBS information expressed according to a value of the service flow update indicator. Receiving from

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.
A method for updating a multicast and broadcast service (MBS) in a terminal,

When the MBS information is updated, a dynamic service change request message including a service flow update indicator, information on the current MBS identifier and flow identifier to be updated and new MBS information expressed according to the value of the service flow update indicator, is received from the base station. Receiving, and

Transmitting a dynamic service change response message to the base station

Including;

When the service flow update indicator has a first value, the information on the current MBS identifier and flow identifier is the current MBS identifier and flow identifier,

When the service flow update indicator has a second value, the information on the current MBS identifier and the flow identifier is an index for the combination of the current MBS identifier and the flow identifier.

How to update MBS.