KR20110100594A - Method and apparatus for managing carrier of multicast and broadcast service - Google Patents

Abstract

Provided is a method of managing a carrier by a terminal in a multi-carrier system. The carrier management method includes the steps of: switching from a main carrier to an MBS carrier for MBS, receiving MBS related data from a base station with the MBS carrier, and after receiving the MBS related data, returning from the MBS carrier to the main carrier And transmitting and receiving data to and from the base station on the primary carrier.

Description

TECHNICAL AND APPARATUS FOR MANAGING CARRIER OF MULTICAST AND BROADCAST SERVICE}

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

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 the case of a radio access system supporting multiple carriers (hereinafter, referred to as a "multi-carrier system"), two types of carriers exist from the viewpoint of a terminal. The first is a primary carrier, which is a carrier for transmitting traffic, control signals, etc. between a base station and a terminal. The second carrier is a secondary carrier, which is an additional carrier to the primary carrier and is a carrier to which special commands or rules used for traffic transmission or indicated by the primary carrier apply.

The UE may switch the physical layer connection from the primary carrier to the subcarrier by the instruction of the base station. This is called carrier switching. The UE returns to the primary carrier after being connected to the subcarrier for a predetermined time, but does not communicate with the base station through the primary carrier while staying in the subcarrier.

In the MBS service, the UE may receive MBS-related data through the MBS carrier corresponding to the subcarrier. In this case, the MBS configuration information is transmitted from the base station to the terminal through the MBS configuration (MBS configuration, MBS-CFG) message. The terminal receives the MBS configuration information and the MBS MAP, and through the MBS MAP, the terminal acquires a time point at which the MBS content subscribed to is transmitted. The transmission time of the MBS configuration information, the MBS MAP, and the MBS content may be explicitly informed by the base station, or may be implicitly known by the terminal. That is, when joining the MBS for the first service, the base station informs the transmission time of the MBS-CFG message or transmits it at a predetermined time point. The UE can infer or know the transmission time of the MBS MAP through the MBS-CFG message, and can know the transmission time of the corresponding content through the MBS MAP.

As such, since the UE knows a time point for receiving MBS-related data, it can know a time point for switching to the MBS carrier. However, when the terminal receives the MBS service and the general service at the same time, there is a problem that the terminal does not know about the time to return to the main carrier to receive the general service.

An object of the present invention is to provide a carrier management apparatus and method capable of knowing when a terminal returns to a primary carrier in MBS.

According to one aspect of the present invention, a carrier management method of a terminal in a multi-carrier system is provided. The carrier management method may include: switching from a main carrier to an MBS carrier for MBS, receiving MBS-related data from a base station with the MBS carrier, and returning from the MBS carrier to the main carrier after receiving the MBS-related data. And exchanging data with the base station on the primary carrier.

The MBS related data may include at least one of an MBS configuration message including MBS configuration information, MBS MAP, and MBS content. The MBS setting message may include information of the MBS MAP, and the MBS MAP may include information of the MBS content.

The switching to the MBS carrier may include switching to the MBS carrier at a time corresponding to the superframe, frame, or subframe in which the MBS configuration message is transmitted.

The returning to the primary carrier may include returning to the primary carrier immediately after receiving the MBS configuration message or after receiving a MBS configuration message and a threshold period has elapsed.

The returning to the primary carrier may include returning to the primary carrier immediately after receiving the MBS MAP or after receiving a MBS MAP and a threshold period has elapsed.

The returning to the primary carrier may include returning to the primary carrier immediately after receiving the MBS content or after a threshold period elapses after receiving the MBS content.

Receiving the MBS related data may include receiving the MBS setup message and the MBS MAP while staying on the MBS carrier.

Receiving the MBS-related data may include receiving the MBS setup message, the MBS MAP and the MBS content while staying on the MBS carrier.

The MBS-related data may further include a field for a time point for returning to the main carrier.

The carrier management method may further include receiving, from the base station, a message including at least one of a time point for switching to the MBS carrier and a time point for returning to the main carrier.

The terminal may switch to the MBS carrier and return to the main carrier according to a predetermined pattern.

According to another feature of the present invention, a carrier management method of a terminal in a base station of a multi-carrier system is provided. The carrier management method may further include transmitting MBS-related data to the terminal as the terminal switches from the main carrier to the MBS carrier for the MBS, and after the terminal receives the MBS-related data from the MBS carrier to the main carrier. And sending and receiving data with the terminal on the primary carrier as it returns.

The carrier management method may further include managing a period of time for the terminal to return to the main carrier after switching to the MBS carrier according to a predetermined pattern.

The carrier management method may further include managing the terminal to return to the primary carrier immediately after receiving the MBS-related data.

The carrier management method may further include managing the terminal to return to the main carrier after a threshold period elapses after receiving the MBS-related data.

The MBS-related data may further include a field for a time point for returning to the main carrier.

The carrier management method may further include transmitting a message including at least one of a time point for switching to the MBS carrier and a time point for returning to the main carrier to the terminal.

According to another feature of the present invention, a carrier management apparatus of a terminal in a multi-carrier system is provided. The carrier management device includes a controller and a receiver. The control unit switches from the main carrier to the MBS carrier for the MBS based on the transmission time point of the MBS related data, and returns from the MBS carrier to the main carrier after receiving the MBS related message. The receiving unit receives the MBS related data from the base station on the MBS carrier and receives data from the base station on the main carrier.

The control unit may complete the reception of the MBS-related data, the time when the threshold period elapses after receiving the MBS-related data, the time included in the MBS-related data, the time included in the message received from the base station, and the base station. At least one of the time points according to the determined pattern may be returned to the main carrier.

According to an embodiment of the present invention, the base station and the terminal may provide other services in addition to the MBS by managing the timing of returning from the MBS carrier to the main carrier.

1 is a schematic flowchart of an MBS supporting method according to an embodiment of the present invention.
2 is a diagram illustrating carrier switching according to an embodiment of the present invention.
3 to 5 are flowcharts of a carrier management method according to an embodiment of the present invention, respectively.
6 is a block diagram of a carrier management 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. 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 flowchart of a method for supporting MBS 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.

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.

Afterwards, for the MBS operation, the UE acquires MBS configuration information by receiving an MBS configuration (MBS configuration, MBS-CFG) message transmitted by the base station (S130). The terminal acquires the MBS MAP based on the MBS configuration information (S140), receives the MBS MAP from the base station based on the information of the MBS MAP, and receives the MBS (S150).

Meanwhile, the terminal may use the MBS carrier to receive the MBS. Hereinafter, the carrier switching in this case will be described in detail with reference to FIGS. 2 to 4.

2 is a diagram illustrating carrier switching according to an embodiment of the present invention, and FIGS. 3 to 5 are flowcharts of a carrier management method according to an embodiment of the present invention, respectively.

2 and 3, when the UE wants to receive the MBS through the MBS carrier, the UE switches to the MBS carrier before transmitting the MBS-CFG message (S210). Since the transmission point of the MBS-CFG message is already defined between the base station and the terminal, for example, as shown in Equation 1, the terminal can know the transmission point of the MBS-CFG message. Alternatively, the base station may separately provide a transmission time of the MBS-CFG message to the terminal. In this case, the base station may provide a frame or subframe in which the MBS-CFG message is transmitted in addition to the superframe in which the MBS-CFG message is transmitted. The superframe consists of a plurality of frames, and the frame consists of a plurality of subframes. That is, the terminal is a time t0 corresponding to a superframe in which the MBS-CFG is transmitted or a time t1 corresponding to a frame or subframe in which the MBS-CFG is transmitted, based on information provided from the base station or a predefined time point. Can be switched to the MBS carrier.

[Equation 1]

N _superframe modulo 32 == 31

The terminal receives the MBS-CFG message through the MBS carrier (S220), and obtains information of the MBS MAP through the MBS-CFG (S230). The terminal receives the MBS MAP (S240), and returns to the main carrier at time t4 when the MBS MAP is received (S250). The terminal acquires information of a resource on which the content corresponding to the MBS (MBS content #i) subscribed through the MAP MAP is transmitted (S260), and switches to the MBS carrier at the time t6 at which the corresponding content is transmitted (S270). ). The terminal receives the MBS content (S280), and returns to the main carrier at the time t7 when the MBS content is received (S290).

Such an operation may be performed in units of an MBS scheduling interval (MSI) including a plurality of superframes.

While the terminal returns to the main carrier and maintains the connection with the base station as the primary carrier, the terminal may receive downlink data from the base station through the main carrier and transmit uplink data to the base station. As such, according to an embodiment of the present invention, the base station and the terminal may provide other services in addition to the MBS by managing the time of staying in the MBS carrier.

Referring to FIG. 4, unlike FIG. 2 and FIG. 3, the UE returns to the main carrier at the time point at which the MBS-CFG message is received (t2 in FIG. 3) (S222) and MBS MAP through the obtained MBS MAP information. At this time of transmission (t3 in FIG. 3), it may be switched back to the MBS carrier (S232).

Referring to FIG. 5, if the MBS content (MBS content # 1) adjacent to the MBS MAP in FIG. 3 corresponds to the MBS subscribed to by the UE, unlike in FIGS. 2 and 4, the UE receives the primary carrier after receiving the MBS MAP. It stays in the MBS carrier for a predetermined period until the MBS content (MBS content # 1) is received without returning to, and receives the time point (t5 of FIG. 3), that is, the MBS content (MBS content # 1) after the threshold period has elapsed. After returning to the primary carrier may be performed (S290).

As described above, according to the embodiment of the present invention, the base station and the terminal may manage the time of staying in the MBS carrier and the time of returning to the main carrier by at least one of the following methods.

1. According to an embodiment, the base station may manage the time the terminal stays in the MBS carrier in a predetermined pattern, and may vary the duration of the pattern. In other words, it is possible to extend or reduce the time to stay in the MBS carrier. At this time, the base station may determine the pattern based on the transmission time of the MBS-CFG message, MBS MAP and MBS content.

2. According to another embodiment, the base station may notify the terminal to return to the main carrier immediately after the terminal receives the MBS-related data on the MBS carrier. Accordingly, the UE may switch to the MBS carrier at the time of receiving the MBS-related data through the MBS carrier and return to the main carrier immediately after receiving the MBS-related data through the MBS carrier.

3. According to another embodiment, the base station may notify the terminal of the threshold period so that the terminal returns to the main carrier after the threshold period has elapsed after receiving the MBS related data on the MBS carrier. Then, the UE may switch to the MBS carrier and receive MBS-related data, stay in the MBS carrier for a critical period, and return to the primary carrier after the threshold period elapses. In this way, the UE can additionally receive MBS-related data provided during the threshold period without carrier switching.

4. According to another embodiment, the base station may put a separate field in the MBS-related data, and inform the time when to return to the main carrier in the corresponding field. The terminal may then return to the primary carrier with reference to the field.

5. According to another embodiment, the base station whenever the terminal switches to the MBS carrier or return to the main carrier message containing a time when the terminal should switch to the MBS carrier and / or the main carrier to the terminal It can also be sent to.

Next, a carrier management apparatus capable of performing a carrier management method according to an embodiment of the present invention will be described with reference to FIG. 6.

6 is a block diagram of a carrier management apparatus according to an embodiment of the present invention.

Referring to FIG. 6, the carrier management apparatus 600 of the terminal includes a receiver 610 and a controller 620.

The receiver 610 receives MBS-related data such as MBS-CFG message, MBS MAP and MBS content transmitted from the base station on the MBS carrier, and receives other data transmitted from the base station on the primary carrier. The control unit 620 switches to the MBS carrier to receive the MBS-related data, and manages the multi-carrier to return to the main carrier after receiving the MBS-related data. At this time, the control unit 620 switches from the main carrier to the MBS carrier based on the transmission time of the MBS-related data. In addition, the control unit 620 completes the reception of the MBS-related data, the time point after receiving the MBS-related data and the threshold period has elapsed, the time defined in the predetermined field of the MBS-related data, the time defined in the message notified from the base station and The UE returns to the main carrier at at least one of the time points according to the pattern determined by the base station.

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 a carrier by a terminal in a multi-carrier system,
Switching from the primary carrier to the MBS carrier for multicast and broadcast service (MBS),
Receiving MBS-related data from a base station on the MBS carrier,
Returning from the MBS carrier to the main carrier after receiving the MBS related data, and
Exchanging data with the base station on the primary carrier
Carrier management method comprising a. In claim 1,
The MBS-related data includes at least one of an MBS configuration message including MBS configuration information, MBS MAP, and MBS content,
The MBS setting message includes information of the MBS MAP,
The MBS MAP includes information of the MBS content.
Carrier management method. In claim 2,
The switching to the MBS carrier includes the step of switching to the MBS carrier at a time corresponding to the superframe, frame or subframe in which the MBS setup message is transmitted. 4. The method of claim 3,
And returning to the primary carrier includes returning to the primary carrier immediately after receiving the MBS setup message or after receiving a MBS setup message and a threshold period has elapsed. 4. The method of claim 3,
And returning to the primary carrier includes returning to the primary carrier immediately after receiving the MBS MAP or after receiving a MBS MAP and having passed a threshold period. 4. The method of claim 3,
And returning to the primary carrier includes returning to the primary carrier immediately after receiving the MBS content or after receiving a threshold period of time after receiving the MBS content. 4. The method of claim 3,
Receiving the MBS-related data, the carrier management method comprising the step of receiving the MBS setup message and the MBS MAP while staying in the MBS carrier. 4. The method of claim 3,
Receiving the MBS-related data, the carrier management method comprising the step of receiving the MBS setup message, the MBS MAP and the MBS content while staying in the MBS carrier. In claim 2,
The MBS-related data further comprises a field for the time point to return to the main carrier. In claim 1,
And receiving a message including at least one of a time point for switching to the MBS carrier and a time point for returning to the main carrier from the base station. In claim 1,
And the terminal switches to the MBS carrier according to a predetermined pattern and returns to the main carrier. In a multi-carrier system, a base station manages a carrier of a terminal,
As the terminal switches from the primary carrier to the MBS carrier for multicast and broadcast service (MBS), transmitting MBS related data to the terminal; and
Exchanging data with the terminal on the primary carrier as the terminal returns from the MBS carrier to the primary carrier after receiving the MBS related data;
Carrier management method comprising a. In claim 12,
And managing, by the terminal, a period of returning to the main carrier after switching to the MBS carrier according to a predetermined pattern. In claim 12,
And managing the terminal to return to the main carrier immediately after receiving the MBS-related data. In claim 12,
And managing the terminal to return to the primary carrier after receiving the MBS-related data and a threshold period has elapsed. In claim 12,
The MBS-related data further comprises a field for the time point to return to the main carrier. In claim 12,
And transmitting a message to the terminal, the message including at least one of a time point for switching to the MBS carrier and a time point for returning to the main carrier. In claim 12,
The MBS-related data includes at least one of an MBS configuration message including MBS configuration information, MBS MAP, and MBS content,
The MBS setting message includes information of the MBS MAP,
The MBS MAP includes information of the MBS content.
Carrier management method. As a carrier management device of a terminal in a multi-carrier system,
Switch from primary carrier to MBS carrier for multicast and broadcast service (MBS) based on transmission time of MBS related data, and after receiving MBS related message, the primary carrier on MBS carrier A control unit to return to, and
Receiving unit for receiving the MBS-related data from the base station on the MBS carrier, and receiving data from the base station on the main carrier
Carrier management apparatus comprising a. The method of claim 19,
The control unit may complete the reception of the MBS-related data, the time when the threshold period elapses after receiving the MBS-related data, the time included in the MBS-related data, the time included in the message received from the base station, and the base station. A carrier management device for returning to the main carrier at least one of the time points according to the determined pattern.

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