WO2010027177A2

WO2010027177A2 - Transmitting device, receiving device, transmitting method, and receiving method for multicast and broadcast service

Info

Publication number: WO2010027177A2
Application number: PCT/KR2009/004901
Authority: WO
Inventors: Namsuk Lee; Eunkyung Kim; Kyung Soo Kim
Original assignee: Electronics And Telecommunications Research Institute; Samsung Electronics Co., Ltd.
Priority date: 2008-09-04
Filing date: 2009-09-01
Publication date: 2010-03-11
Also published as: WO2010027177A3

Abstract

A transmitting device for a multicast and broadcast service (MBS) of a communication system according to an embodiment of the present invention includes: an MBS zone ID bitmap generator that generates an MBS zone ID bitmap including information for notifying of the position of an MBS map message; and a transmitter that transmits a super frame header by adding the MBS zone ID bitmap to the super frame header of a super frame.

Description

TRANSMITTING DEVICE, RECEIVING DEVICE, TRANSMITTING METHOD, AND RECEIVING METHOD FOR MULTICAST AND BROADCAST SERVICE

The present invention relates to a transmitting device, a receiving device, a transmitting method, and a receiving method for a multicast and broadcast service.

In general, a multicast and broadcast service (MBS) is a point-to-multipoint service that transmits data to multiple recipients from one source. In this service, the multiple recipients use a common resource so as to efficiently use resources. The multiple recipients can share a connection ID of a packet so as to use the common resource.

The MBS can be classified into a multiple base station scheme and a single base station scheme. Of them, in the multiple base station scheme, multiple base stations generate and transmit physical signals in the same manner, and an assembly of the multiple base stations is referred to as a multicast and broadcast service zone (MBS zone).

In general, a terminal acquires reception synchronization of an MBS map message by receiving a downlink map. Thereafter, the terminal can receive a follow-up MBS map message by using the previously received MBS map message. However, when the terminal newly establishes MBS connection and participates in a service, abnormally receives the MBS map message, or moves to other base stations, the reception synchronization of the map message is broken. Therefore, the reception synchronization of the MBS map message should be acquired by receiving the downlink map every frame. As a result, power consumption of the terminal is increased.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

The present invention has been made in an effort to provide a transmitting device, a receiving device, a transmitting method, and a receiving method for a multicast and broadcast service having an advantage that a terminal efficiently acquires reception synchronization of an MBS map message in the MBS.

A first embodiment of the present invention provides a transmitting device for a multicast and broadcast service (MBS) in a communication system, that includes: an MBS zone ID bitmap generator that generates an MBS zone ID bitmap including information for notifying the position of an MBS map message; and a transmitter that transmits a super frame header by adding the MBS zone ID bitmap to the super frame header of a super frame.

The MBS zone ID bitmap may indicate whether or not a downlink map including positional information of the MBS map message is provided in the super frame.

The transmitting device may further include a calculator that calculates P, which is a value remaining after dividing an MBS zone ID by the length of the MBS zone ID bitmap, wherein the MBS zone ID bitmap generator may set a P-th bit of the MBS zone ID bitmap to 1.

The transmitting device may further include a controller that controls an operation of the calculator to be performed at a predetermined cycle.

The super frame may include a plurality of frames, and the super frame header may be located at a start point of a first frame of the plurality of frames.

A second embodiment of the present invention provides a receiving device for an MBS in a communication system, that includes: an inspector that inspects whether or not positional information of an MBS map message is transmitted through a downlink map of a super frame by using a super frame header of a super frame; and a receiver that receives the downlink map in order to acquire the positional information of the MBS map message.

The super frame header may include an MBS zone ID bitmap, and the receiving device may further include a calculator that calculates P, which is a value remaining after dividing the MBS zone ID by the length of the MBS zone ID bitmap, wherein the inspector may inspect whether or not a P-th bit of the MBS zone ID bitmap is set to 1.

The receiver may acquire the positional information of the MBS map message through the downlink map when the P-th bit of the MBS zone ID bitmap is set to 1.

The receiver may receive the MBS map message by using the positional information included in the downlink map when receiving the downlink map, and receive a follow-up MBS map message by using the positional information included in the previously received MBS map message when not receiving the downlink map.

A third embodiment of the present invention provides a transmitting method for a multicast and broadcast service (MBS) in a communication system, that includes: generating an MBS zone ID bitmap including information for notifying the position of an MBS map message; adding the MBS zone ID bitmap to a super frame header of a super frame; and transmitting the super frame header.

Generating the MBS zone ID bitmap may include calculating P, which is a value remaining after dividing an MBS zone ID by the length of the MBS zone ID bitmap, and setting the P-th bit of the MBS zone ID bitmap to 1.

A fourth embodiment of the present invention further includes: determining whether or not acquisition of reception synchronization of an MBS map message is needed; verifying the positional information of the MBS map message by using a super frame header of a super frame when the acquisition of the reception synchronization is needed; and receiving the MBS map message through the positional information.

Verifying the positional information of the MBS map message may include receiving a downlink map on the basis of the super frame header, and verifying the positional information of the MBS map message from the downlink map message.

Receiving the downlink map may include calculating P, which is a value remaining after dividing an MBS zone ID by the length of an MBS zone ID bitmap, inspecting whether or not the P-th bit of the MBS zone ID bitmap included in the super frame header is set to 1, and receiving the downlink map when the P-th bit is set to 1.

According to an embodiment of the present invention, a terminal can efficiently acquire reception synchronization of an MBS map message.

FIG. 1 is a diagram illustrating a multicast and broadcast service (MBS) of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a transmitting device for an MBS according to an embodiment of the present invention.

FIG. 3 is a schematic block diagram of a receiving device for an MBS according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a transmitting method for an MBS according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating a receiving method for an MBS according to an embodiment of the present invention.

In the following detailed description, only certain exemplary embodiments of the present invention have been shown and described, simply by way of illustration. 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. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

In the specification, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising", will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. In addition, the terms "-er", "-or", and "module" described in the specification mean units for processing at least one function and operation and can be implemented by hardware components or software components and combinations thereof.

In the specification, a terminal may designate a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), user equipment (UE), an access terminal (AT), etc., and may include the entire or partial functions of the terminal, the mobile terminal, the subscriber station, the portable subscriber station, the user equipment, the access terminal, etc.

In the specification, a base station (BS) may designate an access point (AP), a radio access station (RAS), a node B, an evolved node B (eNodeB), a base transceiver station (BTS), a mobile multihop relay (MMR)-BS, etc., and may include the entire or partial functions of the access point, the radio access station, the node B, the evolved node B, the base transceiver station, the MMR-BS, etc.

Hereinafter, a transmitting method, a transmitting device, a receiving method, and a receiving device for a multicast and broadcast service (MBS) according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating an MBS of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, signals are transmitted and received between a base station and a terminal through super frames that are continued in a wireless communication system, and in FIG. 1, only five super frames sf_k, sf_k+1, sf_k+2, sf_k+3, and sf_k+4 are illustrated for convenience of description. Each of the super frames sf_k, sf_k+1, sf_k+2, sf_k+3, and sf_k+4 includes a plurality of frames f_n-f_n+3, f_n+4-f_n+7, f_n+8-f_n+11, f_n+12-f_n+15, and f_n+16-f_n+19 that are continued. In FIG. 1, each super frame includes four frames. Each of the frames f_n, f_n+1, f_n+2, f_n+3, f_n+4, f_n+5, f_n+6, f_n+7, fn₊₈, f_n+9, f_n+10, f_n+11, f_n+12, f_n+13, f_n+14, f_n+15, f_n+16, f_n+17, f_n+18, and f_n+19 may include a plurality of subframes (not shown).

Each of the super frames sf_k, sf_k+1, sf_k+2, sf_k+3, and sf_k+4 includes a super frame header (SFH). The super frame header (SFH) is located at a start point of each of the super frames sf_k, sf_k+1, sf_k+2, sf_k+3, and sf_k+4 and includes system information.

In the case when one frame includes a plurality of subframes, the super frame header may be located at a first subframe of a first frame in each super frame.

The base station transmits an MBS map message to the terminal so as to provide MBS contents to the terminal. The MBS map message includes resource allocation information for transmitting the MBS contents. Further, the MBS map message may include positional information of the MBS map message transmitted in another frame. For example, MBS map messages of n-th, (n+4)-th, (n+9)-th, and (n+15)-th frames f_n, f_n+4, f_n+9, and f_n+15 include resource allocation information of the MBS contents that are included in (n+3)-th, (n+7)-th, (n+13)-th, and (n+19)-th frames f_n+3, f_n+7, f_n+13, and f_n+19, respectively. Further, the MBS map messages of n-th, (n+4)-th, and (n+9)-th frames f_n, f_n+4, and f_n+9 include positional information of the MBS map messages of (n+4)-th, (n+9)-th, and (n+15)-th frames f_n+4, f_n+9, and f_n+15, respectively.

Meanwhile, the base station may transmit the downlink map in order to notify the positional information of the MBS map message in the same manner as the k-th and (k+2)-th super frames sf_k and sf_k+2. In this case, the downlink map includes the resource allocation information for transmitting the downlink data and the resource allocation information for transmitting the MBS map message.

The terminal receives the downlink map from the base station in the frame f_n after establishing an MBS connection to check whether or not an MBS map message of an MBS zone ID that the terminal wants to receive is transmitted. Thereafter, the terminal receives the MBS map message of the frame f_n by using the resource allocation information included in the MBS map message of the frame f_n, and receives the MBS contents of the frame f_n+3 by using the resource allocation information included in the MBS map message of the frame f_n. Thereafter, the terminal receives the MBS map message of the frame f_n+4 by using the resource allocation information included in the downlink map of the frame f_n, and receives the MBS contents of the frame f_n+7 by using the resource allocation information included in the MBS map message of the frame f_n+4. That is, in the frame f_n+4, the terminal can receive the MBS contents of the frame f_n+4 by using only the MBS map message of the frame f_n without receiving the downlink map.

Meanwhile, the super frame header (SFH) of the super frames sf_k, sf_k+1, sf_k+2, sf_k+3, and sf_k+4 includes an MBS zone ID bitmap. A connection identifier that terminals belonging to the same MBS zone share is referred to as the MBS zone ID. The MBS zone ID bitmap indicates whether or not the MBS map message belonging to the corresponding MBS zone ID is transmitted into the corresponding super frame and whether or not the downlink resource allocation information for the MBS map message is transmitted through the downlink map in a predetermined map of the super frame.

That is, the super frame header included in the super frame sf_k indicates that the downlink map included in a predetermined frame among the frames f_n to f_n+3 that are included in the super frame sf_k includes the downlink allocation information for the MBS map message. Accordingly, the terminal receives the downlink map, receives the MBS map message on the basis of the received downlink map, and receives the MBS contents on the basis of the MBS map message.

Further, the super frame header included in the super frame sf_k+1 indicates that the downlink map including the downlink allocation information for the MBS map message is not included in the frames f_n+4 to f_n+7 included in the super frame sf_k+1. As a result, the terminal receives the MBS contents of the frame f_n+7 by using the resource allocation information included in the MBS map message of the frame f_n+4 without receiving the downlink map.

The super frame header of the super frame sf_k+2 indicates that the downlink map included in any one of the frames f_n+8 to f_n+11 includes the downlink allocation information for the MBS map message similar to the super frame sf_k, and the super frame header of the super frames sf_k+3 and sf_k+4 indicates that the downlink map including the downlink allocation information for the MBS map message is not included in the frames f_n+12 to f_n+15 and f_n+6 to f_n+9similar to the super frame sf_k+1.

As in the super frames sf_k, sf_k+2, by providing the information of the MBS map message through the downlink map, when the terminal newly participates in the MBS service, the terminal can acquire the reception synchronization of the MBS map message in the case in which the reception synchronization of the MBS map message is lost and the terminal moves to another base station in the same MBS zone. Therefore, when the terminal needs to acquire the reception synchronization of the MBS map message, the terminal can determine whether or not the terminal receives the downlink map by using the MBS zone ID bitmap of the super frame header. When the terminal does not need to acquire the reception synchronization of the MBS map message, the terminal can receive a follow-up MBS map message by using the previously received MBS map message without using the downlink map. As a result, it is possible to save power of the terminal.

Hereinafter, a transmitting device for an MBS according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

Referring to FIG. 2, the MBS transmitting device 200, as a part installed in the base station, includes a calculator, 210, an MBS zone ID bitmap generator 220, a super frame header transmitter 230, and a controller 240.

The calculator 210 calculates P, which is a value remaining after dividing the MBS zone ID by N, which is the length of the MBS zone ID bitmap.

The MBS zone ID bitmap generator 220 generates the MBS zone ID bitmap so that a P-th bit is set to 1 by receiving P which is the value remaining that is calculated by the calculator 210. In this case, a remaining bit of the MBS zone ID bitmap can be set to 0.

The super frame header transmitter 230 transmits the super frame header including the MBS zone ID bitmap generated in the MBS zone ID bitmap generator 220 to the terminal.

Since the controller 240 controls an operation of the calculator 210 to be performed at a predetermined cycle, the controller 240 can include, for example, a timer notifying a predetermined time at a predetermined cycle.

Hereinafter, a receiving device for an MBS according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

Referring to FIG. 3, the MBS receiving device 300, which is installed in the terminal, includes a calculator 310, an inspector 320, and a receiver 330.

The calculator 310 calculates P, which is a value remaining after dividing the MBS zone ID by N, which is the length of the MBS zone ID bitmap.

The inspector 320 inspects whether or not a P-th bit of the MBS zone ID bitmap is set to 1 by receiving the super frame header.

As an inspection result in the inspector 320, when the P-th bit of the MBS zone ID bitmap is set to 1, the receiver 330 receives the downlink map, receives the MBS map message by using the resource allocation information included in the downlink map, and receives the MBS contents by using the resource allocation information included in the MBS map message. As the inspection result in the inspector 320, when the P-th bit of the MBS zone ID bitmap is not set to 1, the receiver 330 receives the follow-up MBS map message by using the information included in the previously received MBS map message without receiving the downlink map and receives the MBS contents by using the resource allocation information included in the follow-up MBS map message.

Hereinafter, a transmitting method for an MBS according to an embodiment of the present invention will be described in detail with reference to FIG. 4.

Referring to FIG. 4, first, when an alarm of a timer set in the controller is generated (S410), the base station firstly calculates P, which is a value remaining after dividing an MBS zone ID by N, which is the length of an MBS zone ID bitmap (S420).

Subsequently, the base station generates an MBS zone ID bitmap of which a P-th bit is set to 1, and transmits such a super frame header including the MBS zone ID bit map (S430).

Thereafter, the base station transmits a downlink map by adding resource allocation information for an MBS message to a downlink map of any one frame of frames included in the corresponding super frame (S440).

Next, the base station transmits an MBS map message by using the resource allocation information for the MBS message included in the downlink map (S450).

Hereinafter, a receiving method for an MBS according to an embodiment of the present invention will be described in detail with reference to FIG. 5.

Referring to FIG. 5, a terminal determines whether or not acquisition of reception synchronization of the MBS map message is needed (S510). As the determination result, when acquisition of the reception synchronization of the MBS map message is needed, P, which is a value remaining after dividing the MBS zone ID that the terminal desires by N, which is the length of the MBS zone ID bitmap is calculated (S520).

Thereafter, the terminal receives the super frame header (S530) and inspects whether or not the P-th bit of the MBS zone ID bitmap is set to 1 (S540).

As the inspection result, when the P-th bit of the MBS zone ID bitmap is not set to 1, the terminal operates in a power save mode during the corresponding super frame (S550). That is, the terminal does not receive the downlink map.

As the inspection result, when the P-th bit of the MBS zone ID bitmap is set to 1, the terminal receives the downlink map (S560) and acquires the MBS reception synchronization by receiving the MBS map message (S570) with the resource allocation information included in the received downlink map.

The above-mentioned exemplary embodiments of the present invention are not embodied only by an apparatus and method. Alternatively, the above-mentioned exemplary embodiments may be embodied by a program performing functions, which correspond to the configuration of the exemplary embodiments of the present invention, or a recording medium on which the program is recorded.

While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

A transmitting device for a multicast and broadcast service (MBS) in a communication system, comprising:

an MBS zone ID bitmap generator that generates an MBS zone ID bitmap comprising information for notifying the position of an MBS map message; and

a transmitter that transmits a super frame header by adding the MBS zone ID bitmap to the super frame header of a super frame.
The transmitting device of claim 1, wherein

the MBS zone ID bitmap indicates whether or not a downlink map comprising positional information of the MBS map message is provided in the super frame.
The transmitting device of claim 1, further comprising

a calculator that calculates P, which is a value remaining after dividing an MBS zone ID by the length of the MBS zone ID bitmap,

wherein the MBS zone ID bitmap generator sets a P-th bit of the MBS zone ID bitmap to 1.
The transmitting device of claim 3, further comprising

a controller that controls an operation of the calculator to be performed at a predetermined cycle.
The transmitting device of claim 1, wherein

the super frame comprises a plurality of frames, and

the super frame header is located at a start point of a first frame of the plurality of frames.
A receiving device for an MBS in a communication system, comprising:

an inspector that inspects whether or not positional information of an MBS map message is transmitted through a downlink map of a super frame by using a super frame header of a super frame; and

a receiver that receives the downlink map in order to acquire the positional information of the MBS map message.
The receiving device of claim 6, wherein

the super frame header comprises an MBS zone ID bitmap, and

the receiving device further comprises a calculator that calculates P, which is a value remaining after dividing the MBS zone ID by the length of the MBS zone ID bitmap,

wherein the inspector inspects whether or not a P-th bit of the MBS zone ID bitmap is set to 1.
The receiving device of claim 7, wherein

the receiver acquires the positional information of the MBS map message through the downlink map when the P-th bit of the MBS zone ID bitmap is set to 1.
The receiving device of claim 6, wherein

the receiver receives the MBS map message by using the positional information comprised in the downlink map when receiving the downlink map, and receives a follow-up MBS map message by using the positional information included in the previously received MBS map message when not receiving the downlink map.
A transmitting method for an MBS of a base station in a communication system, comprising:

generating an MBS zone ID bitmap comrpsing information for notifying of the position of an MBS map message;

adding the MBS zone ID bitmap to a super frame header of a super frame; and

transmitting the super frame header.
The transmitting method of claim 10, wherein

generating the MBS zone ID bitmap comprises:

calculating P, which is a value remaining after dividing an MBS zone ID by the length of the MBS zone ID bitmap; and

setting the P-th bit of the MBS zone ID bitmap to 1.
The transmitting method of claim 11, wherein

the MBS zone ID bitmap indicates whether or not a downlink map comprising positional information of the MBS map message is provided in the super frame.
A receiving method for an MBS of a terminal in a communication system, comprising:

determining whether or not acquisition of reception synchronization of an MBS map message is needed;

verifying positional information of the MBS map message by using a super frame header of a super frame when the acquisition of the reception synchronization is needed; and

receiving the MBS map message through the positional information.
The receiving method of claim 13, wherein

verifying the positional information of the MBS map message comprises:

receiving a downlink map on the basis of the super frame header; and

verifying the positional information of the MBS map message from the downlink map message.
The receiving method of claim 14, wherein

receiving the downlink map comprises:

calculating P, which is a value remaining after dividing an MBS zone ID by the length of an MBS zone ID bitmap;

inspecting whether or not the P-th bit of the MBS zone ID bitmap included in the super frame header is set to 1; and

receiving the downlink map when the P-th bit is set to 1.