KR101451858B1 - Apparatus and method for multicast and broadcast service in broadband wireless access system - Google Patents

Abstract

The present invention relates to an apparatus and method for multicast and broadcast services in a broadband wireless access system. A method for packetizing MBS traffic in a system for providing a broadcast service according to the present invention, the method comprising the steps of: dividing MBS traffic received from a network for synchronization; generating GRE (Generic Routing Encapsulation ) Packet, and the GRE packet includes at least one of a traffic identifier indicating an MBS, an MBS zone identifier, a broadcast channel identifier, and synchronization information. The GRE packet is transmitted to the base station in consideration of the packet period .

Broadcast service, MBS, time synchronization, packet synchronization

Description

[0001] APPARATUS AND METHOD FOR MULTICAST AND BROADCAST SERVICE IN BROADBAND WIRELESS ACCESS SYSTEM [Technical Field] [0001] The present invention relates to an apparatus and method for a multicast and broadcast service in a broadband wireless access system,

The present invention relates to an apparatus and method for Multicast and Broadcast Service (MBS) in a broadband wireless access system, and more particularly to an apparatus and method for generating MBS packets supporting time and packet synchronization will be.

Generally, a communication system has evolved mainly in voice service, and is gradually evolving into a communication system capable of not only voice but also data service and various multimedia services. However, the voice-oriented communication system has not satisfied the service needs of users who are soaring because the transmission bandwidth is relatively small and the fee for use is high. In addition, due to the development of the telecommunication industry and the increase of users' demand for the internet service, there is a growing need for a communication system capable of efficiently providing the Internet service. Accordingly, the present invention has been introduced to a broadband wireless access system for efficiently providing Internet services with a wide bandwidth sufficient to meet the needs of soaring users.

The broadband wireless access system is a system for integrally supporting not only voice but multimedia application services such as various data services of low speed and high speed and high quality video. Such a broadband wireless access system may be implemented in a mobile or fixed environment based on a wireless medium using broadband such as 2GHz, 5GHz, 26GHz, and 60GHz, a Public Switched Telephone Network (PSTN), a Public Switched Data Network (PSDN) ATM (Asynchronous Transfer Mode) network, and can support a channel transmission rate of 2Mbps or higher. The broadband wireless access system can be classified into a broadband wireless access network, a broadband mobile access network, and a high-speed wireless LAN (Local Area Network) depending on the mobility (fixed or mobile) of the terminal, the communication environment (indoor or outdoor) .

The wireless access method of the broadband wireless access system is standardized in the IEEE 802.16 standardization group of the Institute of Electrical and Electronics Engineers, one of the international standardization organizations.

The IEEE 802.16 standard is capable of transmitting a large amount of data in a short time due to a wide bandwidth of data compared to a wireless technology for a conventional voice service and allowing all users to share channels (or resources) . In addition, quality of service (QoS) is ensured so that users can receive different quality services according to the characteristics of the services.

The IEEE 802.16 system has a Multicast and Broadcast Service (MBS) service standard capable of providing multicast and broadcast to a plurality of mobile stations. In the MBS standard, the same multicast and broadcast service areas can be distinguished through different CIDs (Connection Identifiers) or different SAs (Security Associations). That is, the MBS zone (MBS_ZONE) can be distinguished through CID and SA. The base station broadcasts MBS_ZONE information through a Downlink Channel Descriptor (DCD) message. That is, MBS_ZONE can be regarded as a base station group using the same CID and SA to transmit contents.

The MBS service is divided into a single-BS access and a multi-BS access according to a service access method of a mobile terminal. The single-base station access scheme is a scheme in which a mobile station receives an MBS service from one base station to which the mobile station is registered, and the multi-base station access scheme is a scheme in which a mobile station receives an MBS service from two or more base stations simultaneously. FIG. 1 is a diagram illustrating a single-base station access method, and FIG. 2 is a diagram illustrating a multi-base station access method.

As shown in FIG. 2, when the mobile station is in a position where the current serving cell and the neighboring cell overlap with each other, the multi-base station access scheme notifies that a signal of a neighboring cell is not a noise due to interference, Frequency combining acts as a signal gain. This is the Macro Diversity effect. However, in order to obtain such a macro diversity effect, the signal transmitted from the serving base station and the base station of the neighboring cell must be the same. Therefore, in order to provide MBS, all base stations in MBS_ZONE must transmit the same signal at the same time.

In this way, when MBS is provided, a time synchronization scheme is required to allow all base stations in the same broadcast zone (MBS_ZONE) to transmit the same signal at the same time.

Generally, a base station generates a MAC (Media Access Control) layer PDU (Packet Data Unit) by fragmenting or packing service data units (e.g., IP packets) received from a network, PDUs to generate physical layer bursts, and encodes the physical layer bursts at a predetermined Modulation and Coding Scheme (MCS) level for transmission. The reason why the division and packing operation occurs in the base station is that the size of the packet (IP packet) received from the network is variable. In case of the Multi-BS MBS, it is preferable that the base station controller or the MBS controller performs a division and packing operation for the synchronization, and the base station bypasses the received packet without dividing and packing.

This is because, when base stations belonging to the same broadcast zone individually segment or pack MBS packets received from the network without considering synchronization, MAC PDUs of different sizes can be generated with respect to the same content. In this case, A problem that can not be transmitted at the precise synchronization point occurs.
In other words, in order to obtain the macro diversity effect for the MBS service, the BS must not perform the division or packing operation for the service data unit (IP packet). Packets received from the network must be received in the MAC PDU in order to prevent the base station from performing segmentation or packing operations.

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It is therefore an object of the present invention to provide an apparatus and a method for all base stations in the same broadcast zone in a broadband wireless access communication system to transmit the same signal at the same time.

It is another object of the present invention to provide an apparatus and method for transmitting an MBS packet received from a network in a broadband wireless access communication system without packetization at a base station.

It is still another object of the present invention to provide an apparatus and method for generating an MBS packet suitable for a wireless zone in a broadband wireless access communication system.

It is another object of the present invention to provide an apparatus and method for determining the size and interval of an MBS packet according to wireless interval scheduling information in a broadband wireless access communication system.

According to one aspect of the present invention, there is provided an apparatus for packetizing MBS traffic in a system for providing a broadcast service, the apparatus comprising: a division unit for dividing MBS traffic received from a network for synchronization; A GRE packet generating unit for generating a GRE (Generic Routing Encapsulation) packet with each segment from the install unit; and the GRE packet including at least one of a traffic identifier indicating an MBS, an MBS zone identifier, a broadcast channel identifier, And a communication unit for transmitting the GRE packet from the GRE packet generation unit to the base station in consideration of the packet period.

According to another aspect of the present invention, there is provided a method for packetizing MBS traffic in a system for providing a broadcast service, the method comprising: dividing MBS traffic received from a network for synchronization; Generating a Generic Routing Encapsulation (GRE) packet, the GRE packet including at least one of a traffic identifier indicating whether the MBS is an MBS zone identifier, a broadcast channel identifier, and synchronization information, And transmitting the data to the base station.
According to another aspect of the present invention, there is provided a wireless communication system including an MBS controller for dividing MBS traffic received from a core service network for synchronization, generating each of the segmented segments as a GRE packet, Wherein the GRE packet includes at least one of a traffic identifier indicating an MBS, an MBS zone identifier, a broadcast channel identifier, and synchronization information, and configuring a GRE packet from the MBS controller into bursts without division and packing, And transmitting the synchronization information to the terminal based on the synchronization information included in the packet.
Preferably, the synchronization information includes at least one of time stamping information corresponding to a broadcast absolute time, packing and division information, and the like.

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As described above, the present invention has an advantage that base stations belonging to the same broadcast zone can perform timing synchronization in a broadband wireless access system that provides multicast and broadcast service (MBS). That is, according to the present invention, MBS traffic is packetized in advance in an upper level system of a base station and is transmitted to a base station, that is, no separate fragmentation or packing is performed in the base station. There is an advantage that time synchronization can be easily performed with respect to traffic.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, a timing synchronization scheme for the base stations belonging to the same broadcast zone (MBS_ZONE) to transmit the same signal at the same time in a broadband wireless access communication system providing a broadcast service will be described.

In particular, for the time synchronization, the base station should not perform fragmentation or packing operations on packets received from the network. That is, the present invention is to packetize the MBS traffic in advance in the upper system of the base station according to the radio interval, and transmit the packet to the base station.

The broadcast service may be referred to as a multicast broadcast service (MCBCS), a multicast and broadcast service (MBS), a multi media broadcast and multicast service (MBMS), or a broadcast / multicast service (BCMCS) according to the intent of a standard group and an operator have.

In the following description, the name of the network entity (NE) is defined according to the function, and may be changed according to the intention of the standardization group and the operator. For example, the base station may be referred to as an access point (AP), a radio access station (RAS), a node-B, or a base station (BS). The base station controller may be referred to as an RNC (Radio Network Controller), a BSC (Base Station Controller), an ACR (Access Control Router), or an ASN-GW (Access Service Network Gateway) GW can perform router functions as well as base station controller functions.

Hereinafter, an OFDM / OFDMA based broadband wireless communication system will be described as an example, but the present invention can be easily applied to other wireless communication systems that provide a broadcasting service.

FIG. 3 illustrates a network structure according to an embodiment of the present invention.

As shown, the network structure is divided into a service provider (SP) domain and an access provider (AP) domain.

The MCBCS AS (application server) 30 is operated by a service provider, and generates a service guide for the service area of the service provider and provides it to the MCBCS NS 31. In addition, the MCBCS AS 30 may include subscription management, user authentication and authorization processing, user group management, content encryption / decryption key management and distribution, distribution, content protection, stream and file transmission, user interaction with a user, notification or alert function to notify emergency broadcasting, and the like. Here, the content served by the MCBCS AS 30 may be provided from a contents provider (CP) (not shown).

The MCBCS NS 31 collects and transmits MCBCS information (e.g., a service guide and the like) from at least one MCBCS AS 30-1 and / or 30-2 and performs management for efficient use of network resources . In addition, the MCBCS NS 31 may include an MCBCS transmission zone management, a service guide processing and distribution, a stream and file transmission, a multicast group management, report management function. Here, some functions of the MCBCS NS 31 may be performed in a network entity located in the ASN.

The MCBCS controller 32 is configured in an access service network (e.g., a block in the ASN_GW) and performs a packet / time synchronization function on the broadcast content. The MCBCS controller 32 multicasts the synchronized packet to base stations belonging to the same MBS zone.

As shown, one service area may be composed of at least one MCBCS Tx zone, and one MCBCS Tx zone may be composed of at least one MBS zone. Here, the MCBCS Tx zones may overlap each other, and the overlap area may also be formed of at least one MBS zone.

The base station 33 transmits the broadcast content from the MCBCS controller 32 through a predetermined resource at a predetermined time. Here, BSs belonging to the same MBS zone broadcast the same content at the same time for macro-diversity. Meanwhile, the service guide is transmitted to the terminal through an application layer protocol (e.g., HTTP). Accordingly, the terminal can confirm the broadcast channels (or the contents list) that can be received at the current location through the service guide.

Although not shown, a policy server, an AAA (Authentication, Authorization, Accounting) server, a network management server, and the like may be configured in the core service network.

As described above, one MBS_ZONE is composed of a plurality of base stations, and base stations in the same MSB_ZONE transmit the same broadcast signal at the same time. Hereinafter, an operation for transmitting the same broadcast signal at the same time by BSs in the same broadcast zone MBS_ZONE will be described.

In order for base stations belonging to the same broadcast zone to transmit the same broadcast signal, the upper system of the base station packetizes the MBS data according to radio section information, and transmits the generated MBS synchronization packet to base stations belonging to the same broadcast zone Should be transmitted. Hereinafter, it is assumed that the packetization is performed in the MCBCS controller 32.

According to the present invention, the MCBCS controller 32 manages a packet size and a packet interval according to air content rate, air scheduling information (MCS level, MBS burst size) as a mapping table. Accordingly, when the rate and the air scheduling information are obtained, the MCBCS controller 32 can determine a packet size and a packet period for generating an MBS synchronization packet. Here, the transmission rate of the broadcast content may be determined according to the type of content (e.g., audio, video, etc.), and the air scheduling information may be input by the system operator or received from the base station 33. In addition, it is preferable that the packet period is determined to be an integral multiple of a wireless section frame length. For example, if the frame length is assumed to be 5 ms, the packet period may be determined as 5 ms, 10 ms, 15 ms, 20 ms, and so on.

When the packet size and the packet period are determined, the MCBCS controller 32 divides the MBS data received from the MCBCS NS 31 in consideration of the packet size, and uses GRE (Generic Routing Encapsulation) packet. At this time, the header (GRE header) of the GRE packet may include an identifier (traffic identifier) capable of distinguishing traffic of a payload, an MBS zone identifier, and an MBS channel identifier. In addition, the payload of the GRE packet (GRE payload) may include synchronization information (time stamp information, packing & division information, length information), MBS packet, and the like.

Meanwhile, the GRE packet is encapsulated into an IP packet, and the IP packet is multicasted to base stations belonging to the same broadcast zone. Then, the BSs directly generate an MBS packet from the MCBCS controller 32 as an MAC PDU (MBS burst) without division or packing, and map the MBS burst to a predetermined resource at a corresponding broadcast time and transmit the MBS burst. Thus, the base stations belonging to the same broadcast zone (MBS zone) can broadcast the corresponding content using the same resources at the same time.

Hereinafter, the GRE packet according to the present invention will be described in detail.

Referring to FIG. 4, the GRE packet is divided into a GRE header and a GRE payload.

First, in the GRE header, the most significant 5 bits (C / R / K / S / s) are fields for setting whether to include an option field, the next 8 bits are reserved fields for future use, 3 bits are a field for setting a version, the next 16 bits are fields for setting a protocol type of a payload, and the next 4 bytes are fields for setting a key for a GRE tunnel Field, and the next four bytes are fields for setting a sequence number of a packet. In addition, it may further include a checksum field, an encapsulation count control field, an offset field, and a routing field depending on whether the flag of the upper 5 bits is set or not.

The present invention also records MBS related information as well as information for a GRE tunnel (such as a board and a processing block identifier in a BS) in the key field. Here, the MBS-related information includes a traffic identifier for distinguishing whether the payload traffic is a unicast traffic, an MBS traffic, or a general multicast traffic, an MCBCS service type (e.g., a dynamic multicast or a static multicast or broadcast; BS MBS or multi-BS MBS without macro diversity or MBS with macro diversity), an MBS zone identifier, and a broadcast channel identifier. Among the MCBCS service types, a dynamic multicast scheme is a scheme of dynamically switching between broadcast and unicast according to the number of users receiving broadcast channels. In the static multicast scheme, a terminal uses an IGMP join Indicates a scheme of not switching to unicast (broadcast can be turned off), and the broadcast scheme indicates a scheme of broadcasting a broadcast channel specified in a specified broadcast time. The traffic identifier requires only one bit when distinguishing only unicast traffic and MBS traffic, and requires two bits when distinguishing three types of traffic. Also, in the case of WiMAX, the MBS zone identifier is 1 byte (MSB = 0), and the MAC layer broadcast channel identifier (MCID) is 12 bits. However, since the MAC layer broadcast channel identifier has 95 (0xFEA0 to 0xFEFE) at present, all the broadcast channel identifiers can be represented by 7 bits. Therefore, if only 14 bits are required, the MBS zone identifier and the broadcast channel identifier can be displayed.

If a multicast IP address of a backhaul is used instead of the MBS zone identifier, the multicast IP address may be recorded in a payload rather than a key field.

Next, looking at the GRE payload, some bytes (e.g., 5 bytes) are fields for setting synchronization information, and the remaining bytes are fields for setting MBS traffic. For example, the synchronization information is recorded at a fixed size immediately after the GRE header. The synchronization information includes absolute time stamping information, information indicating packing and fragmentation, length information indicating the total length of the GRE payload (synchronization information + MBS traffic), and the like. . For example, in the case of WiMAX, 3 bytes are required when using a frame number (FN) as timestamping information, 2 bits are required when packing and dividing information is used, and length information is a byte count 11 bits are required because it must be less than 1500 bytes. When 3 bits are reserved, the field for the synchronization information is 5 bytes.

Here, an example of a method of displaying packing & division information is as follows. '00' indicates that the segmentation / packing operation has not been performed, '01' indicates that the packing operation has been performed, '10' indicates that fragmentation and zero padding operations have been performed, '11 'Indicates that the partitioning and packing operation has been performed.

If the key field is mostly used for purposes other than MBS, an MBS zone ID and a broadcast channel identifier (MCID) may also be recorded in the synchronization information field. In this case, the synchronization information field requires a total of 10 bytes or 11 bytes.

4, at least one of a traffic identifier, an MCBCS service type, an MBS zone identifier, and a broadcast channel identifier is set in the header of the GRE packet. The GRE payload includes time stamping information, packing & Length and MBS traffic are set.

In another embodiment, a traffic identifier is set in the header of the GRE packet, and a GRE payload includes an MCBCS service type, an MBS zone identifier, a broadcast channel identifier, timestamping information, packing and division information, payload length information, May be set.

In another embodiment, at least one of a traffic identifier, an MCBCS service type, an MBS zone identifier, a broadcast channel identifier, and packing & division information is set in the header of the GRE packet, and the GRE payload includes time stamping information, And MBS traffic may be set.

As described above, the information to be recorded in the GRE header and the information to be recorded in the GRE payload can be variously classified. Although the above embodiment describes that MBS related information is recorded in a key field in a GRE header, the MBS related information may include an optional field (e.g., a protocol type field, a sequence number field, Routing field, etc.).

Meanwhile, although the GRE packet is described as an example in the present invention, other tunneling packets may be used. In addition, although the terms of the present invention are described based on the MBS standard of WiMAX, it will be obvious that other terms of the same concept can be substituted when the applied wireless network is different.

FIG. 5 shows a configuration of a network entity (NE) for performing packetization according to an embodiment of the present invention. The NE performing the packetization may be, for example, one of the MCBCS NS 31 and the base station controller. The following description assumes that the MCBCS controller 32 (or the MBS DPF) in the base station controller performs the NE. .

The MCBCS controller 32 includes a controller 500, a radio section information storage section 502, a mapping table storage section 504, a buffer 506, a partitioning section 508, a GRE packet generation section 510 And a communication unit 516. [

Referring to FIG. 5, the controller 500 controls the overall operation of the MCBCS controller 32. The wireless section information storage unit 502 manages wireless section information (e.g., air scheduling information and the like) for each of the broadcast zones (MBS_ZONE). Here, the wireless section information may be input by the system operator or received from the base station 33. [

The mapping table storage unit 504 manages a packet size and a packet interval according to a broadcast content transfer rate (air rate) and wireless interval information (e.g., MCS level and MBS burst size) using a mapping table. For example, the mapping table can be expressed as shown in Table 1 below.

Transfer rate [Kbps]
Wireless section information
(MCS level, burst size)
Packet Size [Byte]
Packet Cycle [ms] 600 QPSK, 1/2, and 4 symbols 384 5 (= 1 frame) ... ... ... ... ... ... ... ... ... ... ... ...

The control unit 500 determines a packet size and a packet period for generating the MBS synchronization packet by accessing the mapping table with the broadcast content transmission rate and the wireless interval information. At this time, the controller 500 determines MBS related information (eg, MBS zone identifier, broadcast channel identifier, time stamping information, packet & split information, etc.) to be recorded in each GRE packet. The controller 500 controls the corresponding component according to the determined contents.

The buffer 506 buffers the MBS data received from the network (or the MCBCS NS 31), and outputs the MBS data under the control of the controller 500. The partitioning unit 508 divides MBS data from the buffer 506 according to the determined packet size and outputs the MBS data.

The GRE packet generation unit 510 generates a GRE packet with each of the divided data from the division unit 508 and outputs the GRE packet. Here, the GRE header generator 512 generates a GRE header as shown in FIG. At least one of a traffic identifier, an MBS zone identifier, and a broadcast channel identifier is recorded in the GRE header. Meanwhile, the GRE payload generator 514 generates an SDU (Service Data Unit: IP packet) with the divided data from the division unit, adds the MBS-related synchronization information to the SDU, and generates a GRE payload. Here, the synchronization information may include at least one of time stamping information corresponding to a broadcast absolute time, packing and division information, length information of a GRE payload, an MBS zone identifier, and a broadcast channel identifier. The GRE payload generator 514 combines the GRE header with the GRE payload to generate a GRE packet.

The communication unit 516 encapsulates the GRE packet from the GRE packet generator 510 into an IP packet, and multicasts the IP packet to base stations belonging to the same broadcast zone. If the network between the base station controller and the base station is Ethernet, the communication unit 516 may encapsulate the GRE packet into an Ethernet packet and transmit the Ethernet packet to the base station.

6 shows a detailed configuration of a base station according to an embodiment of the present invention.

As illustrated, the base station includes a control unit 600, a mapping table storage unit 602, an MBS SDU storage unit 604, an MBS MAC PDU generation unit 606, an encoder 608, an OFDM modulator 610, a CP An adder 612, a DAC 614, and an RF processor 616.

Referring to FIG. 6, the mapping table storage unit 602 manages a mapping table as shown in Table 1 above. The control unit 600 accesses the mapping table with a broadcast content transmission rate and wireless section information (e.g., air scheduling information) to obtain a packet size and a packet period of the MBS synchronization packet. For example, the broadcast content transmission rate may be determined according to the type of content (e.g., audio, video), and the radio section information may be input by the system operator. When the packet size and the packet period of the content are determined as described above, the controller 600 performs resource scheduling and controls the corresponding component according to the resource scheduling result.

The MBS SDU storage unit 604 buffers MBS packets (IP packets) received from the network, and outputs each of the buffered MBS packets under the control of the controller 600 at that time. The MBS MAC PDU generation unit 606 generates a packet data unit (PDU) of the MAC layer by adding a MAC header to the MBS packet from the MBS SDU storage unit 606, ). As described above, the present invention configures a packet received from a network directly into an MAC PDU, and uses the MAC PDU thus configured as it is as a physical layer burst. That is, the packet received from the network can be directly transmitted to the wireless section without being divided or packed.

The encoder 608 codes and modulates a burst (MAC PDU) from the MAC PDU generator 606 with a predetermined modulation and coding scheme (MCS) level. The OFDM modulator 610 maps an MBS burst from the encoder 608 to a corresponding resource, and performs an Inverse Fast Fourier Transform (IFFT) operation on the MBS burst. The CP adder 612 adds a guard interval (e.g., a cyclic prefix) to the sample data from the OFDM modulator 610 and outputs the guard interval. The DAC 614 converts the sample data from the CP adder 612 into an analog signal and outputs it. The RF processor 616 converts the baseband signal from the DAC 614 into an RF band signal and transmits it through the antenna.

FIG. 7 shows an operation procedure of a network entity for performing packetization according to an embodiment of the present invention. For example, the NE performing the packetization may be one of the MCBCS NS 31 and the base station controller, and the following description assumes that the MCBCS controller 32 in the base station controller performs the NE.

Referring to FIG. 7, the MCBCS controller 32 checks the transmission rate of the broadcast content and the radio interval information of the broadcast zone (MBS_ZONE) in step 701. FIG. For example, the transmission rate of the broadcast content may be determined according to the type of content (e.g., audio, video, etc.) and the wireless interval information (air scheduling information) may be input by the system operator or received from the base station 33 .

If the transmission rate and the radio link information are confirmed, the MCBCS controller 32 accesses a predetermined mapping table (Table 1) with the transmission rate and the radio link information in step 703 to acquire the packet size and the packet period. In step 705, the MCBCS controller 32 divides the MBS data to be transmitted to the base station 33 according to the packet size.

In step 707, the MCBCS controller 32 generates a GRE header for the segmented data. In the GRE header, at least one of a traffic identifier indicating an MBS, an MBS zone identifier, and a broadcast channel identifier may be set.

In step 709, the MCBCS controller 32 generates an SDU (e.g., an IP packet) with the segmented data, and adds the MBS-related synchronization information to the SDU to generate a GRE payload. Here, the synchronization information may include at least one of time stamping information corresponding to a broadcast absolute time, packing and division information, length information of a GRE payload, an MBS zone identifier, and a broadcast channel identifier.

In step 711, the MCBCS controller 32 combines the generated GRE header with the GRE payload to generate a GRE packet. The MCBCS controller 32 encapsulates the generated GRE packet into an IP packet in step 713, and transmits the IP packet to the base stations belonging to the same broadcast zone.

FIG. 8 illustrates an operation procedure of a base station according to an embodiment of the present invention.

Referring to FIG. 8, in step 801, the BS 33 confirms the MBS content transmission rate and radio interval information. For example, the transmission rate of the MBS content may be determined according to a content type (e.g., audio, video, etc.), and the radio section information may be input by a system operator.

If the transmission rate and the radio interval information are confirmed, the base station 33 accesses a predetermined mapping table (Table 1) with the transmission rate and the radio interval information in step 803, and determines a packet size and a packet period. The determined packet size and packet period can be used for resource scheduling.

Then, the BS 33 proceeds to step 805 to check whether the MBS content is received from the network. If the reception of the MBS content is detected, the BS 33 proceeds to step 807 and buffers MBS packets (or SDU, IP packets) received from the network.

In step 809, the base station 33 checks whether the transmission time according to the packet period has been reached. If the transmission time is reached, the BS 33 adds a MAC (Media Access Control) header to the MBS packet in step 811 to generate a MAC PDU. In step 813, the BS 33 codes and modulates the generated MAC PDU (MBS burst) with a predetermined MCS level, maps the modulated data to a predetermined resource, and transmits the modulated data. Then, the base station 33 returns to step 809 for the next transmission. As described above, the present invention configures a packet (service data unit) received from the network directly as a MAC PDU, and transmits the MAC PDU thus configured as it is as a physical layer burst.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by the scope of the patent office as well as the scope of patent claims described below.

1 illustrates a single-base station access scheme in a wireless communication system providing a broadcast service;

2 is a diagram illustrating a multi-base station access scheme in a wireless communication system providing a broadcast service;

3 illustrates a network architecture in accordance with an embodiment of the present invention.

4 is a diagram illustrating the structure of a GRE packet according to an embodiment of the present invention.

5 illustrates a configuration of a network entity (NE) that performs packetization according to an embodiment of the present invention.

6 is a diagram showing a detailed configuration of a base station according to an embodiment of the present invention;

7 is a diagram illustrating an operation procedure of a network entity for performing packetization according to an embodiment of the present invention.

8 is a diagram illustrating an operation procedure of a base station according to an embodiment of the present invention.

Claims (26)

An apparatus for packetizing a multicast service, a broadcast service, and traffic in a system for providing a broadcast service, A division unit for dividing the multicast service and the broadcast service traffic received from the network according to the content transmission rate or the wireless section information for synchronization; A packet generator for generating a specific packet with each of the segments from the division unit; Wherein the specific packet includes at least one of a traffic identifier indicating a multicast service and a broadcast service, a multicast service and a broadcast service, a zone identifier and a broadcast channel identifier, And a communication unit for transmitting the specific packet from the packet generating unit to the base station. The method according to claim 1, Wherein the synchronization information includes at least one of time stamping information corresponding to a broadcast absolute time, packing and division information. 3. The method of claim 2, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, and the broadcast channel identifier, Wherein the payload of the specific packet includes at least one of the time stamping information, the packing & 3. The method of claim 2, The header of the specific packet includes the traffic identifier, Wherein the payload of the specific packet includes at least one of the multicast service and the broadcast service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, the time stamping information, and the packing & . 3. The method of claim 2, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, and the packing & Wherein the payload of the particular packet comprises the timestamping information. delete The method according to claim 1, Further comprising a storage unit configured to manage a packet size and a packet period according to the content transmission rate or the wireless zone information as a mapping table. The method according to claim 1, Wherein the radio zone information includes at least one of a Modulation and Coding Scheme (MCS) level and a multicast service and a broadcast service burst size. The method according to claim 1, Wherein the communication unit encapsulates the specific packet into an IP packet and multicasts the IP packet to base stations belonging to the same broadcast zone. A method for packetizing multicast service and broadcast service traffic in a system for providing a broadcast service, Receiving multicast service and broadcast service traffic from the network; Dividing the received multicast service and broadcast service traffic according to a content transmission rate or radio interval information for synchronization; Generating a specific packet with each of the segmented segments; Wherein the specific packet includes at least one of a traffic identifier indicating a multicast service and a broadcast service, a multicast service, a broadcast service zone identifier, a broadcast channel identifier, and synchronization information, And transmitting the generated specific packet to a base station. The method of claim 10, wherein Wherein the synchronization information includes at least one of time stamping information corresponding to a broadcast absolute time, packing and division information. 12. The method of claim 11, Generating a header of the specific packet; And generating a payload of the specific packet, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, and the broadcast channel identifier, Wherein the payload of the specific packet includes at least one of the time stamping information, the packing & 12. The method of claim 11, Generating a header of the specific packet; And generating a payload of the specific packet, The header of the specific packet includes the traffic identifier, Wherein the payload of the specific packet includes at least one of the multicast service and the broadcast service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, the time stamping information, and the packing ≪ / RTI > 12. The method of claim 11, Generating a header of the specific packet; And generating a payload of the specific packet, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, and the packing & Wherein the payload of the particular packet comprises the timestamping information. delete 11. The method of claim 10, And managing a packet size and a packet period according to the content transmission rate or the wireless section information as a mapping table. 11. The method of claim 10, Wherein the wireless zone information includes at least one of a Modulation and Coding Scheme (MCS) level and a multicast service and a broadcast service burst size. The method of claim 10, wherein the step of transmitting the generated specific packet to a base station comprises: Encapsulating the specific packet into an IP packet; And multicasting the IP packet to base stations belonging to the same broadcast zone. In a wireless communication system, A multicast service and a broadcast service for dividing a multicast service and a broadcast service traffic received from a core service network according to a content transmission rate or radio interval information for synchronization, generating each of the segmented segments as a specific packet, A controller, Wherein the specific packet includes at least one of a traffic identifier indicating a multicast service and a broadcast service, a multicast service, a broadcast service zone identifier, a broadcast channel identifier, and synchronization information, And a base station configured to form a specific packet from the multicast service and the broadcast service controller into bursts without division and packing and transmit the burst to the terminal based on the synchronization information included in the specific packet. system. The method of claim 19, wherein Wherein the synchronization information includes at least one of time stamping information corresponding to a broadcast absolute time, packing and division information. 21. The method of claim 20, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, and the broadcast channel identifier, Wherein the payload of the specific packet includes at least one of the time stamping information and the packing & division information. 21. The method of claim 20, The header of the specific packet includes the traffic identifier, Wherein the payload of the specific packet includes at least one of the multicast service and the broadcast service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, the time stamping information, and the packing & . 21. The method of claim 20, The header of the specific packet includes at least one of the traffic identifier, the multicast service and the broadcast service service type, the multicast service and the broadcast service zone identifier, the broadcast channel identifier, and the packing & And the payload of the specific packet includes the time stamping information. The method according to claim 1, Wherein the specific packet is a Generic Routing Encapsulation (GRE) packet. 11. The method of claim 10, Wherein the specific packet is a Generic Routing Encapsulation (GRE) packet. 20. The method of claim 19, Wherein the specific packet is a Generic Routing Encapsulation (GRE) packet.

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