KR20110121558A - Method and apparatus for managing configuration information of multicast and broadcast service - Google Patents

Abstract

PURPOSE: A method and a device for managing configuration information of a multicast and broadcast service are provided not to enable a terminal to decode a super frame, frame, or sub frame. CONSTITUTION: A scheduling unit(710) allocates a MBS setup message including the set up information for MBS operation among a MBS scheduling period to the fixed location. A transmitter(720) transmits the MBD setting message to a terminal on the fixed location. The MBS scheduling period includes a plurality of super frames.

Description

METHOD AND APPARATUS FOR MANAGING CONFIGURATION INFORMATION OF MULTICAST AND BROADCAST SERVICE}

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

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.

The terminal receives the MBS configuration message from the base station to obtain the information of the MBS MAP, and receives and decodes the MBS MAP representing the MBS burst data information based on the information of the MBS MAP. The terminal may acquire burst information corresponding to the MBS content based on the MBS MAP, and receive and decode the corresponding burst.

As such, the terminal may access the stream corresponding to the content of the MBS through the MBS MAP indicated by the MBS setting message, thereby preventing unnecessary data decoding. However, the MBS configuration message is generally transmitted at an arbitrary time point of the superframe immediately before the start time of the MBS scheduling interval (MSI) consisting of a plurality of superframes. Therefore, in order to receive the MBS configuration message, the UE needs to confirm whether to transmit the MBS configuration message in every frame or subframe of the corresponding superframe, thus increasing the overhead of the terminal.

An object of the present invention is to provide a method and apparatus for managing MBS configuration information that can reduce the load on the terminal.

According to an embodiment of the present invention, a method of managing MBS configuration information at a base station is provided. The MBS configuration information management method may include allocating an MBS configuration message including configuration information for an MBS operation to a fixed location during an MBS scheduling period, and transmitting the MBS configuration message to the terminal at the fixed location at intervals of the MBS scheduling period. It includes a step.

In this case, when a plurality of MBS scheduling periods exist, the MBS scheduling period may be a maximum MBS scheduling period among the plurality of MBS scheduling periods.

The MBS scheduling period may include a plurality of superframes, and each superframe may include a plurality of frames. The fixed position may be the first frame of the first superframe of the plurality of superframes.

Each frame may include a plurality of subframes, and the fixed position may be the first subframe of the first frame.

Alternatively, the fixed position may be the last frame of the superframe immediately before the start of the MBS scheduling period.

The MBS configuration information management method may include: dividing a downlink resource into a plurality of subbands in a frequency domain, allocating at least some subbands of the plurality of subbands to a plurality of MBS zones, and in the MBS scheduling period. The method may further include allocating bursts to the plurality of MBS zones. In this case, the fixed position may correspond to a last time point among the time points at which burst allocation of the plurality of MBS zones ends.

The MBS configuration information management method may further include allocating some subbands of the plurality of subbands to unicast. In this case, the fixed position may be formed in an area allocated to the unicast.

The method of managing MBS configuration information may include: allocating a first region divided in a time domain to unicast during the MBS scheduling period, and multiplying a second region divided in the time domain during the MBS scheduling period for MBS data transmission. The method may further include assigning to a cast. In this case, the fixing position may be formed in the first region.

According to another embodiment of the present invention, a method for receiving an MBS at a terminal is provided. In the MBS receiving method, receiving a MBS configuration message transmitted at a fixed location of an MBS scheduling period at a base station, decoding the MBS configuration message, obtaining an MBS MAP based on the MBS configuration message, and the MBS MAP Receiving MBS content based on the;

In this case, when a plurality of MBS scheduling periods exist, the MBS scheduling period may be a maximum MBS scheduling period among the plurality of MBS scheduling periods.

The fixed position may be the first frame of the first superframe of the plurality of superframes.

In this case, the fixed position may be a first subframe of the first frame of the first superframe.

Alternatively, the fixed position may be the last frame of the superframe immediately before the start of the MBS scheduling period.

Downlink resources may be divided into a plurality of subbands in the frequency domain, and at least some of the plurality of subbands may be allocated to the plurality of MBS zones. When bursts are allocated to the plurality of MBS zones in the MBS scheduling period, the fixed position may correspond to the last time point at which burst allocation of the plurality of MBS zones ends.

When some subbands of the plurality of subbands are allocated to unicast, the fixed position may be formed in an area allocated to the unicast.

When the first region divided in the time domain is allocated to unicast during the MBS scheduling period, and the second region divided in the time domain is allocated to multicast for MBS data transmission, the fixed position is the first region. Can be formed on.

The apparatus for managing MBS configuration information according to another embodiment of the present invention includes a scheduling unit and a transmission unit. The scheduling unit allocates an MBS configuration message including configuration information for the MBS operation to a fixed location during the MBS scheduling period. The transmitter transmits the MBS setup message to the terminal at the fixed location based on the MBS scheduling period.

In this case, when a plurality of MBS scheduling periods exist, the MBS scheduling period may be a maximum MBS scheduling period among the plurality of MBS scheduling periods.

The fixed position may be the first frame of the first superframe of the plurality of superframes.

Alternatively, the fixed position may be the last frame of the superframe immediately before the start of the MBS scheduling period.

According to an embodiment of the present invention, since the location of the MBS-CFG message is determined, the terminal may not decode all superframes, frames or subframes, thereby reducing the burden on the terminal.

1 is a schematic flowchart of an MBS supporting method according to an embodiment of the present invention.
2 to 6 are diagrams illustrating a method for managing MBS configuration information according to an embodiment of the present invention, respectively.
7 is a schematic block diagram of an apparatus for managing MBS configuration information 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. 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), and the like, 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, or 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 schematic flowchart of an MBS supporting method according to an embodiment of the present invention.

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 using a registration request (registration request, REQ-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. This MBS performance exchange process may be omitted.

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 (S120). 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 MBS connection establishment process may be omitted or may be included in another connection establishment process.

Thereafter, the terminal receives the MBS configuration (MBS configuration, MBS-CFG) message transmitted by the base station for the MBS operation to obtain MBS configuration information for the MBS operation (S130). The terminal acquires a message including MBS resource allocation information, for example, an MBS MAP based on the MBS configuration information (S140), and receives an MBS from the base station based on the information of the MBS MAP (S150).

Next, the MBS configuration information management method according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6.

2 and 3 are diagrams illustrating a method for managing MBS configuration information according to an embodiment of the present invention, respectively.

Referring to FIG. 2, the base station transmits an MBS-CFG message at a predetermined time point (ie, a predetermined subframe of a predetermined frame of a predetermined superframe) at every predetermined period. As an example, the base station transmits an MBS-CFG message at each start of MSI. If one superframe includes a plurality of frames and one frame includes a plurality of subframes, the start time point is the first subframe of the first frame of the superframe corresponding to the start of the MSI. The MSI is an MBS scheduling period consisting of a plurality of consecutive superframes, and the network may schedule a stream related to the MBS before the MSI.

This MSI is an extensible value, for example, may have a length of 4, 8, 16, 32 superframes. In another embodiment, the base station may transmit the MBS-CFG message at each start time of the maximum MSI (the MSI having a length of 32 superframes) among the MSIs. That is, the base station can transmit the MBS-CFG message in cycles of 32 superframes.

Meanwhile, the first subframe of the first frame of each superframe includes a superframe header (SFH) that carries a superframe number, etc., and the SFH includes least significant bits (LSB) of the superframe number. It includes a primary superframe header (primary SFH, P-SFH) and the secondary superframe header (secondary SFH, S-SFH) including the MSB (mos significant bits) of the superframe number. Also, the first subframe in which the MBS-CFG message is transmitted further includes resource allocation information, for example, advanced MAP (A-MAP), for transmission of control information of the MBS-CFG message. If the MBS-CFG message cannot be transmitted with only the first subframe by P-SFH, S-SFH, and A-MAP, part of the MBS-CFG message is sent in the first subframe, and the other part is in the next subframe. Can transmit Meanwhile, the base station transmits the MBS MAP at the start of the MSI so that the terminal can receive the MBS content. When the MBS-CFG message is applied to the next subframe, the base station may transmit the MBS MAP in the next subframe or the next frame. . Alternatively, the base station may transmit the MBS MAP in a specific subframe or a specific frame.

Referring to FIG. 3, the base station transmits an MBS-CFG message at a predetermined time point (ie, a predetermined subframe of a predetermined frame of a predetermined superframe) every predetermined period. As an example, the base station transmits an MBS-CFG message in a predetermined subframe of the last frame of the superframe immediately before the start of the MSI. In this way, the base station can transmit the MBS MAP at the start of the MSI, so that the location of the MBS MAP can be fixed.

In another embodiment, the base station may transmit the MBS-CFG message in the last frame of the shoe frame immediately before the start time of the maximum MSI among the MSI.

Next, a method of transmitting the MBS-CFG message according to the downlink resource will be described in detail with reference to FIGS. 4 to 6.

4 to 6 are diagrams illustrating a method for managing MBS configuration information according to an embodiment of the present invention, respectively.

Referring to FIG. 4, a downlink resource is divided into a plurality of subbands in a frequency domain, a subband region including some subbands among the plurality of subbands is allocated to unicast, and the remaining subbands are multicast, that is, It is assigned to at least one MBS zone. In FIG. 4, when downlink resources are divided into 10 subbands, a subband zone including the first and second subbands is assigned to the third MBS zone (MBS Zone # 3) and the third and fourth subbands. Subband zones are included in the second MBS Zone (MBS Zone # 2) and subband zones including the fifth subband are assigned to the first MBS Zone (MBS Zone # 1).

The subband area assigned to the MBS zone includes the MBS MAP for that MBS zone at the start of the MSI. In each subband area, a burst including MBS content for the corresponding MBS zone is allocated after the MBS MAP. When the burst allocation of the first MBS zone ends at E1 time point, the burst allocation of the second MBS zone ends at E2 time point, and the burst allocation of the third MBS zone ends at E3 time point, the base station ends at these ending points (E1, E2). , E3) allocates the MBS-CFG message based on the last point in time (E3 in FIG. 4). For example, the base station may allocate the MBS-CFG message at a specific time point or after the last time point E3 or at the last time point E3. The base station allocates resource allocation information for the MBS-CFG message, for example, A-MAP to a subframe in which the MBS-CFG message is transmitted, or allocates A-MAP to a specific area (for example, a specific subband). Can be. At this time, the MBS-CFG message is allocated to the subband area allocated by unicast.

Accordingly, the UE predicts that the MBS-CFG message is transmitted only after the last time point E3, and may receive and decode the subframe only after the last time point E3. In this case, the terminal may infer the last time point E3 through the MBS frame offset indicating the position of the frame at which the MBS data burst ends. The MBS frame offset may be included in a system configuration descriptor message, for example, an advance air interface system configuration descriptor (AAI-SCD) message.

Meanwhile, the base station may inform the time when the MBS-CFG message is allocated through the MBS MAP, that is, the subframe or the frame.

In another embodiment, the base station may allocate an MBS-CFG message at a maximum MSI cycle.

In another embodiment, as illustrated in FIG. 3, the base station may allocate the MBS-CFG message to a predetermined subframe of the last frame of the superframe immediately before the start of the maximum MSI.

Next, referring to FIG. 5, downlink resources are divided into a plurality of subbands in the frequency domain, and the plurality of subbands are allocated to multicast without being assigned to unicast. In FIG. 5, when downlink resources are divided into 10 subbands, a subband area including first to third subbands is assigned to the third MBS zone (MBS Zone # 3), and the fourth and sixth subbands. It is illustrated that an included subband zone is assigned to a second MBS zone (MBS Zone # 2), and a subband zone including seventh to tenth subbands is assigned to a first MBS Zone #MB.

The base station allocates the MBS-CFG message at the last point in time (E3 in FIG. 5) among burst points E1, E2, and E3 of the plurality of MBS zones. In this case, even if the downlink resources are all multicast areas for the MBS, the base station may define the corresponding multicast area to transmit the MBS-CFG message. The base station may allocate an A-MAP for the MBS-CFG message to a subframe in which the MBS-CFG message is transmitted or allocate an A-MAP to a specific area.

Next, referring to FIG. 6, a specific frame is allocated to unicast in the downlink resource and the remaining area is allocated to multicast. The base station transmits the MBS data through the multicast region and transmits the MBS-CFG message through the unicast region. The unicast region for MBS-CFG message transmission may be the last frame of the superframe immediately before the start of the MSI or the maximum MSI as described in FIG. 2 or the start of the MSI or the maximum MSI as described in FIG. 3. In another embodiment, a unicast region for MBS-CFG message transmission may be formed at any location of the MSI.

In another embodiment, the unicast region for MBS-CFG message transmission may be formed in units of superframes or subframes instead of frames, and may be formed in two or more superframes, frames or subframes.

As described above with reference to FIGS. 2 to 6, according to an embodiment of the present invention, since the location of the MBS-CFG message is determined, the terminal may not decode all superframes, frames, or subframes. Can reduce the overhead.

An example of the configuration of the following MBS-CFG message will be described with reference to Table 1.

Referring to Table 1, the MBS-CFG message includes MBS configuration information for each MBS zone. The MBS configuration information includes MBS Zone ID, resource information of MBS MAP applied to the MBS Zone ID, Burst size information of MBS MAP, neighbor MBS Zone ID, current MBS identifier (MBS ID) and flow identifier (flow ID, FID) between serving MBS zone and neighbor MBS zone and new MBS ID and FID Contains mapping information. 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, the burst size information of the MBS MAP is the offset used to calculate the burst size of the MBS MAP ( MBS MAP I _SizeOffset ). 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. The MBS-CFG message further includes a valid period LIFETIME indicating a period during which the MBS configuration information is not changed.

Syntax Size (bits) Notes MBS-CFG_Message_Format () {  MAC Control Message Type 8 MBS-CFG  LIFETIME 4 Indicates the duration of LIFETIME for which the MBS configuration information of the zone does not change.  for (i = 0; i <Num_ MBS_Zones; i ++) {   MBS_Zone_ID 7 The MBS_Zone_ID to which this MBS MAP applies.   MBS MAP Resource Index 11 Resource index includes location and allocation size. MBS MAP I _SizeOffset 5 Offset used to compute burst size index   MBS ID and FID Mappings List inclusion One Indicates whether MBS ID and FID Mapping list is included or not   if (MBS ID and FID Mappings List inclusion == 1) {    E-MBS ID and FID Mappings List Variable E-MBS ID and FID Mappings List between serving and neighbor E-MBS Zones   }  } }

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

7 is a schematic block diagram of an apparatus for managing MBS configuration information according to an embodiment of the present invention.

Referring to FIG. 7, the apparatus 700 for managing MBS configuration information of a base station includes a scheduling unit 710 and a transmitter 720.

The scheduling unit 710 allocates the MBS-CFG message to a fixed position of the MSI or the maximum MSI. The transmitter 720 transmits the MBS-CFG message at a fixed location at intervals of MSI or maximum MSI. In this case, as described with reference to FIGS. 2 to 6, the fixed position is the last of the start of the MSI or the maximum MSI, the last frame of the superframe immediately before the start of the MSI or the maximum MSI, and the end of the burst allocation for the MBS zone. It may be a viewpoint, a unicast region, or the like.

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 (20)

A method for managing multicast and broadcast service (MBS) configuration information at a base station,
Allocating an MBS configuration message including configuration information for the MBS operation to a fixed location during the MBS scheduling period, and
Transmitting the MBS setup message to the terminal at the fixed location at intervals of the MBS scheduling period;
MBS setting information management method comprising a. In claim 1,
And a plurality of MBS scheduling periods, the MBS scheduling period is the maximum MBS scheduling period of the plurality of MBS scheduling periods. In claim 1,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the first frame of the first superframe of the plurality of superframes
How to manage MBS setting information. 4. The method of claim 3,
Each frame contains a plurality of subframes,
The fixed position is the first subframe of the first frame
How to manage MBS setting information. In claim 1,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the last frame of the superframe immediately before the start of the MBS scheduling period.
How to manage MBS setting information. In claim 1,
Dividing downlink resources into a plurality of subbands in the frequency domain;
Allocating at least some of the plurality of subbands to a plurality of MBS zones, and
Allocating bursts to the plurality of MBS zones in the MBS scheduling period
More,
The fixed position corresponds to a last point in time at which burst allocation of the plurality of MBS zones ends.
How to manage MBS setting information. In claim 6,
Allocating some subbands of the plurality of subbands to unicast;
The fixed position is formed in the area allocated to the unicast
How to manage MBS setting information. In claim 1,
Allocating a first region divided in a time domain to unicast during the MBS scheduling period, and
Allocating a second region divided in the time domain during the MBS scheduling period to multicast for MBS data transmission;
More,
The fixed position is formed in the first region
How to manage MBS setting information. A method for receiving a multicast and broadcast service (MBS) at a terminal,
Receiving an MBS setup message transmitted at a fixed location of an MBS scheduling period at a base station and decoding the MBS setup message;
Obtaining an MBS MAP based on the MBS setup message, and
Receiving MBS content based on the MBS MAP
MBS receiving method comprising a. In claim 9,
The MBS scheduling period is the maximum MBS scheduling period of the plurality of MBS scheduling periods when a plurality of MBS scheduling periods exist. In claim 9,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the first frame of the first superframe of the plurality of superframes
How to receive MBS. In claim 11,
Each frame contains a plurality of subframes,
The fixed position is the first subframe of the first frame of the first superframe.
How to receive MBS. In claim 9,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the last frame of the superframe immediately before the start of the MBS scheduling period.
How to receive MBS. In claim 9,
Downlink resources are divided into a plurality of subbands in a frequency domain, at least some of the plurality of subbands are allocated to a plurality of MBS zones,
When bursts are allocated to the plurality of MBS zones in the MBS scheduling period, the fixed position corresponds to the last time point at which burst allocation of the plurality of MBS zones ends.
How to receive MBS. The method of claim 14,
And when some subbands of the plurality of subbands are allocated to unicast, the fixed position is formed in an area allocated to the unicast. In claim 9,
When the first region divided in the time domain is allocated to unicast during the MBS scheduling period, and the second region divided in the time domain is allocated to multicast for MBS data transmission, the fixed position is the first region. MBS receiving method formed in. A device for managing multicast and broadcast service (MBS) configuration information,
A scheduling unit for allocating an MBS configuration message including configuration information for the MBS operation to a fixed location during the MBS scheduling period, and
Transmitter for transmitting the MBS setting message to the terminal at the fixed location in the MBS scheduling period
MBS setting information management device comprising a. The method of claim 17,
And a plurality of MBS scheduling periods, the MBS scheduling period is a maximum MBS scheduling period of the plurality of MBS scheduling periods. The method of claim 17,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the first frame of the first superframe of the plurality of superframes
MBS setting information management device. The method of claim 17,
The MBS scheduling period includes a plurality of superframes, each superframe includes a plurality of frames,
The fixed position is the last frame of the superframe immediately before the start of the MBS scheduling period.
MBS setting information management device.

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