WO2011115434A2

WO2011115434A2 - Multicast and broadcast service resource management method and device

Info

Publication number: WO2011115434A2
Application number: PCT/KR2011/001854
Authority: WO
Inventors: 김은경; 장성철; 차재선; 정수정; 이현; 윤철식
Original assignee: 한국전자통신연구원
Priority date: 2010-03-17
Filing date: 2011-03-17
Publication date: 2011-09-22
Also published as: WO2011115434A3

Abstract

If area allocation information of a subband is changed, a terminal receives a new MBS setup message after a validity period of an MBS setup message has expired at a time when an SCD message including the changed area allocation information has been received. Then, the terminal applies the changed area allocation information at the start of a first MSI of the new MBS setup message.

Description

Method and apparatus for managing multicast and broadcast service resources

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

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 users, and the multicast service refers to a service transmitted to a specific group of users.

In order to support MBS, downlink resources (ie, downlink frames) are divided into a unicast region and a multicast region for MBS. Subbands are divided in one subframe to allocate a subband logical resource unit (SLRU) in each MBS zone region and a unicast region.

At this time, the base station needs to transmit to the terminal information such as how the areas are distinguished, when the areas are distinguished, and information according to the change when the areas are changed, so that the terminal properly receives a service corresponding to the base station.

An object of the present invention is to provide an MBS resource management method and apparatus capable of efficiently providing a terminal with information in which downlink resource regions are distinguished when supporting MBS.

According to one aspect of the present invention, there is provided a method for managing MBS resources of a terminal. The MBS resource management method includes receiving a system configuration descriptor (SCD) message including area allocation information of subbands divided into a plurality of areas, including setting information and an effective period for an MBS operation. Receiving an MBS setup message, receiving an SCD message in which the area allocation information has been changed, and receiving a new MBS setup message after the validity period of the MBS setup message at the time when the changed SCD message is received expires. And applying the changed area allocation information at the start of a first MBS scheduling interval (MSI) of the new MBS configuration message.

In this case, the plurality of regions may include a region for at least one MBS zone and a region for unicast.

The SCD message may further include a flag indicating that the plurality of regions include the region for unicast.

The SCD message may further include a counter that is incremented when the content of the SCD message is changed.

The MBS resource management method may further include checking the change of the area allocation information based on the counter of the SCD message.

Receiving the new MBS setting message may receive the new MBS setting message at a time point specified by the valid period.

The region allocation information may include a bitmap consisting of bits having a value of '1' when regions corresponding to two adjacent subbands are different from each other.

The MSI may include a plurality of superframes, and the SCD message may further include information about the length of the MSI.

According to another feature of the invention, there is provided a MBS resource management method of a base station. The MBS resource management method may further include transmitting an SCD message including area allocation information of subbands divided into a plurality of areas to the terminal, and transmitting the MBS setting message including the setting information for the MBS operation and an expiration date. Periodically transmitting to the terminal, transmitting the SCD message including the changed area allocation information to the terminal when the area allocation information is changed, and when the area allocation information is changed, the valid period expires. Thereafter, applying the changed area allocation information at the start of the first MSI of the next MBS setting message.

According to another feature of the invention, there is provided an MBS resource management apparatus of the terminal. The MBS resource management apparatus includes a receiver and a controller. The receiving unit periodically receives an SCD message including area allocation information of subbands divided into a plurality of areas, and receives an MBS setting message including setting information for a MBS operation and a valid period. When the area allocation information of the SCD message is changed, the controller applies the changed area allocation information at the start of MSI of the next MBS setting message after the valid period of the current MBS setting message has expired.

The SCD message may further include a counter that is incremented when the contents of the SCD message change, and the controller may confirm the change of the area allocation information based on the counter of the SCD message.

According to another feature of the present invention, there is provided an MBS resource management apparatus of a base station. The MBS resource management apparatus includes a transmitter and a controller. The transmitter periodically transmits an SCD message including area allocation information of subbands divided into a plurality of areas to the terminal, and periodically sends an MBS setting message including setting information for the MBS operation and a valid period to the terminal. send. When the area allocation information is changed, the controller applies the changed area allocation information at the start of the first MSI of the next MBS setting message after the validity period of the current MBS setting message has expired.

According to an embodiment of the present invention, the base station and the terminal may apply the changed subband region allocation information at an accurate time. In addition, in the case of a terminal receiving data through unicast, it is possible to precisely synchronize the time of change of the region where the terminal measures the channel and the region allocated by the base station to unicast.

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

2 is a diagram illustrating an SCD message according to an embodiment of the present invention.

3 and 4 are diagrams illustrating an example of area allocation of downlink resources, respectively.

5 is a diagram illustrating a change in area allocation of downlink resources.

6 is a diagram illustrating a time point of application of a changed SCD message.

7 is a schematic block diagram of an MBS resource management apparatus of a terminal according to an embodiment of the present invention.

8 is a schematic block diagram of an MBS resource management apparatus of a base station 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.

1 is a flowchart of a method for supporting MBS according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a system configuration descriptor (SCD) message according to an embodiment of the present invention.

Referring to FIG. 1, the base station periodically transmits information about the system configuration to the terminal in order to define a system configuration (S110). System configuration information may be transmitted via an SCD message.

Referring to FIG. 2, the SCD message includes a region allocation bitmap (Zone_Allocation-Bit-MAP) indicating region allocation information of a subband, a region flag indicating whether the last region is used as unicast, and contents of an SCD message. Includes a Configuration Change Count that indicates whether a change has occurred. The configuration change counter is incremented each time the contents of the SCD message change.

Referring back to FIG. 1, when the UE wants to receive the MBS, the UE transmits information on the MBS mode supported by the UE to the base station, and the base station transmits information on the MBS mode supported by the UE from among the MBS modes supported by the UE. Send to the terminal (S120). 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 (REQ-REQ) message for the registration request when the network enters or re-entries, 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 connection establishment request message to the terminal for establishing the MBS connection, and the terminal transmits a response message to the base station (S130). In this case, a dynamic service addition request (DSA-REQ) message may be used as the connection establishment request message, and a dynamic service addition response (DSA-RSP) as a response message to the connection establishment request message. You can use messages. 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.

The base station periodically transmits an MBS configuration (MBS-CFG) message, and the terminal receives the MBS-CFG message for MBS reception to obtain MBS configuration information (S140). The terminal acquires the MBS MAP based on the MBS configuration information (S150), and receives the MBS from the base station based on the information of the MBS MAP (S160).

In this case, the MBS-CFG message may be transmitted in 32 superframe periods, for example, in a superframe that satisfies Equation (1). The MBS-CFG message is MBS configuration information. MBS Zone ID for each MBS zone, resource information of MBS MAP applied to the MBS zone identifier, burst size information of MBS MAP, and neighbor MBS Zone identifier. ID), mapping information of a current MBS identifier (MBS ID) and a flow identifier (flow ID, FID) between a serving MBS zone and a neighboring MBS zone and a new MBS ID and FID. Here, the resource information of the MBS MAP may be a resource index (MBS MAP Resource Index) indicating the location and allocation size of the MBS MAP resource in the subband area allocated to the corresponding MBS zone, and the burst size information of the MBS MAP is the MBS MAP. It may be an offset (MBS MAP I _SizeOffset ) used to calculate the burst size. The MBS ID is an identifier assigned to the terminal to receive the MBS, and the FID is an identifier assigned to the MBS connection and exists in pairs with the corresponding MBS ID. In addition, the MBS-CFG message further includes a lifetime indicating a period during which the MBS configuration information is not changed. The validity period specifies a time point at which the UE receives and decodes the MBS-CFG message and does not count down.

[Equation 1]

N _superframe modulo 32 == 31

Then, the terminal decodes the MBS-CFG message, checks the information of the MBS MAP corresponding to the MBS zone to which it belongs, and receives the MBS MAP. The terminal does not decode the MBS-CFG message again until the time point specified in the valid period of the decoded MBS-CFG message is received, at which point the MBS-CFG message is received and decoded again. For example, if the valid period of the MBS-CFG message is m, the UE may decode the MBS-CFG message in the superframe that satisfies the condition of Equation (2).

[Equation 2]

N _superframe modulo (32 × (m + 1)) == 32 × (m + 1) -1

Here, N _superframe is a _superframe number.

3 and 4 are diagrams illustrating an example of area allocation of downlink resources.

Referring to FIG. 3, subband regions are divided in a downlink frame, and each region is allocated to a corresponding MBS zone (MBS Zone # 1, MBS Zone # 2). If unicast resources are needed, the region containing the last subband is allocated to unicast.

For example, subbands are divided into 10, so the first to fifth subbands are assigned to the first MBS Zone (MBS Zone # 1), and the sixth to eighth subbands are assigned to the second MBS Zone #MB. When the ninth to tenth subbands are allocated to unicast, the area allocation bitmap (Zone_Allocation-Bit-MAP) may be set to "000010010" as shown in FIG. In other words, set the total number of bits in the area-allocated bitmap to subtract 1 from the total number of subbands, and set the bit to "1" if the i-th subband and the (i + 1) th subband belong to different areas. If the i-th subband and the (i + 1) th subband belong to the same area, the corresponding bit can be set to "0".

3 and 4, when unicast is allocated to the last subband area, an area flag (ZF of FIG. 2) of the SDU message may be set to a value indicating that unicast is allocated.

Next, the MBS resource management method according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

FIG. 5 is a diagram illustrating a change in area allocation of downlink resources, and FIG. 6 is a diagram illustrating a time point of applying a changed SCD message.

The base station may change the area allocation of the subbands in the downlink resource. For example, as shown in FIG. 5, the first to third subbands are allocated to the first MBS Zone (MBS Zone # 1), and the fourth to fifth subbands are assigned to the second MBS Zone (MBS Zone # 2). 3 and 4 subbands can be changed as in the example of FIGS. 3 and 4 with the sixth to seventh subbands assigned to the third MBS Zone (MBS Zone # 3) and the eighth to tenth subbands assigned to unicast. .

Then, the base station updates the contents of the SCD message, that is, the area allocation bitmap, with the changed subband area allocation information, and transmits the updated SCD message. The base station transmits the SCD message by increasing the value of the configuration change counter of the SCD message by 1 to indicate the update of the SCD message.

UE receiving unicast data or MBS based on the existing subband area allocation information has changed the subband area from the start time (s) of the first MBS Scheduling Interval (MSI) after receiving the changed SCD message. Receive unicast data or MBS based on the allocation information.

Here, the MSI consists of a plurality of superframes that are continuous at intervals at which MBS traffic is scheduled, and an MSI length (N _MSI ) indicating how many superframes the _MSI consists of may be transmitted through an SCD message. And MSI may be started in a super frame (SF) that satisfies the equation (3).

[Equation 3]

N _superframe modulo N _MSI == 0

5 and 6, the first MSI to which the subband region allocation information of the changed SCD message is applied means the first MSI in the validity period of the next MBS-CFG message. That is, if the valid period of the MBS-CFG message has not expired at the time of receiving the changed SCD message, the terminal receives the MBS from the base station based on the information of the MBS MAP confirmed through the current MBS-CFG message. If the validity period of the existing MBS-CFG message expires, the UE applies the subband region allocation information of the SCD message changed at the start time (s) of the first MSI within the validity period of the new MBS-CFG message. The terminal receives the MBS based on the subband region allocation information of the changed SCD message and the MBS configuration information of the new MBS-CFG message.

As described above, according to an embodiment of the present invention, even if the SCD message is changed, the terminal receives the MBS according to the existing MBS configuration information before the expiration of the validity of the existing MBS-CFG message. Since the MBS can be received according to the MBS configuration information of the message and the new MBS-CFG message, the base station and the terminal can apply the changed subband region allocation information at an accurate time point.

In addition, in the case of a terminal receiving data through unicast, before the changed SCD message is applied, the channel state of the unicast area is measured based on the existing subband area allocation information, and after the changed SCD message is applied. The channel state of the unicast region may be measured based on the changed subband region allocation information, and the measured channel information may be fed back to the base station. Therefore, it is possible to accurately synchronize the time of change of the area for the UE to measure the channel and the area allocated by the base station to unicast.

On the other hand, unlike one embodiment of the present invention, if the terminal confirms that the SCD message is changed through the configuration change counter even before the validity period of the existing MBS-CFG message, the terminal does not wait until the validity period expires later The subband area allocation information of the new SCD message and the MBS configuration information of the MBS-CFG message may be applied by receiving the transmitted MBS-CFG message. This minimizes the delay in applying the modified SCD message.

Next, an apparatus for managing MBS resources capable of performing the method of managing MBS configuration information according to an embodiment of the present invention will be described with reference to FIGS. 7 and 8.

7 is a block diagram of an MBS resource management apparatus of a terminal according to an embodiment of the present invention, and FIG. 8 is a block diagram of an MBS resource management apparatus of a base station according to an embodiment of the present invention.

Referring to FIG. 7, the MBS resource management apparatus 700 of the terminal includes a receiver 710 and a controller 720.

The receiving unit 710 receives and decodes the MBS-CFG message and the SCD message transmitted from the base station, and the control unit 720 transmits the MBS-CFG message transmitted at the time point specified by the receiving unit 710 in the validity period of the MBS-CFG message. Control to decode. In addition, when the controller 720 confirms that the contents of the SCD message have changed based on the counter of the SCD message, the controller 720 applies the changed contents of the SCD message at the start of the first MSI after the validity period of the MBS-CFG message expires. .

Referring to FIG. 8, the MBS resource management apparatus 800 of the base station includes a controller 810 and a transmitter 820.

The controller 810 configures the MBS-CFG message and the SCD message to be transmitted to the terminal, and increments the system configuration counter of the SCD message when the area allocation information of the subband is changed. In addition, when the contents of the SCD message are changed, the controller 810 applies the changed contents of the SCD message at the start of the first MSI after the validity period of the MBS-CFG message expires. The transmitter 820 periodically transmits an MBS-CFG message and an SCD message to the terminal.

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 for managing a multicast and broadcast service (MBS) resource in a terminal,

Receiving a system configuration descriptor (SCD) message including area allocation information of subbands divided into a plurality of areas;

Receiving an MBS configuration message including configuration information for the MBS operation and an expiration date,

Receiving an SCD message in which the area allocation information has been changed;

Receiving a new MBS setup message after the validity period of the MBS setup message expires at the time when the modified SCD message is received, and

Applying the changed area allocation information at the start of a first MBS scheduling interval (MSI) of the new MBS configuration message;

MBS resource management method comprising a.
In claim 1,

And the plurality of areas includes an area for at least one MBS zone and an area for unicast.
In claim 1,

The SCD message further includes a flag indicating that the plurality of regions includes the region for unicast.
In claim 1,

The SCD message further comprises a counter that is incremented when the contents of the SCD message is changed.
In claim 4,

Confirming the change of the area allocation information based on the counter of the SCD message.
In claim 1,

The receiving of the new MBS setting message may include receiving the new MBS setting message at a time point designated by the validity period.
In claim 1,

And the region allocation information includes a bitmap of bits having a value of '1' when regions corresponding to two adjacent subbands are different from each other.
In claim 1,

The MSI includes a plurality of superframes,

The SCD message further includes information about the length of the MSI

How to manage MBS resources.
A method for managing a multicast and broadcast service (MBS) resource at a base station,

Transmitting a system configuration descriptor (SCD) message including area allocation information of subbands divided into a plurality of areas to a terminal;

Periodically transmitting an MBS configuration message including configuration information for the MBS operation and a valid period to the terminal;

When the area allocation information is changed, transmitting an SCD message including the changed area allocation information to the terminal; and

Applying the changed area allocation information at the start of the first MBS scheduling interval (MSI) of the next MBS configuration message after the valid period at the time when the area allocation information is changed expires;

MBS resource management method comprising a.
In claim 9,

And the plurality of areas includes an area for at least one MBS zone and an area for unicast.
In claim 10,

The SCD message further includes a flag indicating that the plurality of regions includes the region for unicast.
In claim 9,

The SCD message further comprises a counter that is incremented when the contents of the SCD message is changed.
In claim 9,

And the region allocation information includes a bitmap comprising bits having a value of '1' when regions corresponding to two adjacent subbands are different from each other.
In claim 9,

The MSI includes a plurality of superframes,

The SCD message further includes information about the length of the MSI

How to manage MBS resources.
An apparatus for managing a multicast and broadcast service (MBS) resource of a terminal,

Receive periodically a system configuration descriptor (SCD) message including area allocation information of subbands divided into a plurality of areas, and receive an MBS setting message including setting information for the MBS operation and an expiration date. Receiver, and

If the area allocation information of the SCD message is changed, the changed area at the start of the first MBS scheduling interval (MSI) of the next MBS configuration message after the validity period of the current MBS configuration message has expired. Control unit to apply allocation information

MBS resource management device comprising a.
The method of claim 15,

And the plurality of areas includes an area for at least one MBS zone and an area for unicast.
The method of claim 15,

The SCD message further includes a counter that is incremented when the contents of the SCD message change.

The controller confirms the change of the area allocation information based on the counter of the SCD message.

MBS Resource Management Device.
An apparatus for managing a multicast and broadcast service (MBS) resource of a base station,

MBS configuration message periodically including a system configuration descriptor (SCD) message including area allocation information of subbands divided into a plurality of areas to the terminal, and including configuration information and an effective period for MBS operation Transmitter for periodically transmitting to the terminal, And

When the area allocation information is changed, the changed area allocation information is applied at the start of the first MBS scheduling interval (MSI) of the next MBS configuration message after the validity period of the current MBS configuration message has expired. Control unit

MBS resource management device comprising a.
The method of claim 18,

And the plurality of areas includes an area for at least one MBS zone and an area for unicast.
The method of claim 18,

The SCD message further includes a counter that is incremented when the contents of the SCD message is changed.