KR20090060928A - Apparatus and method for multicast and broadcast service in broadband wireless communication system - Google Patents

Abstract

A device and a method for an MBS in a broadband wireless communication system are provided to allocate an NAP network broadcasting zone and broadcasting channel ID of an MAC(Media Access Control) layer by an NAP, thereby preventing waste of wireless resources. MBS(Multicast Broadcast Service) servers(10-1,10-2) are positioned in a NAP (Network Access Provider) zone. The MBS server comprehensively determines resources of the NAP and broadcasting related information from one or more MCBCS(Multicast and Broadcast Service) servers(11) to produce and transmit a mapping table to an MCBCS server. The MCBCS server is located in an NSP zone. The MCBCS server generates a service guide by using the mapping table and transmits the service guide through an application layer.

Description

Apparatus and method for multicast and broadcast service in broadband wireless communication system {APPARATUS AND METHOD FOR MULTICAST AND BROADCAST SERVICE IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for providing a multicast and broadcast service (MBS), and more particularly, to a network structure and a control method for providing a broadcast service through a wireless network.

In general, communication systems have been developed mainly for voice services, and are gradually developing into communication systems capable of not only voice but also data services and various multimedia services. However, the voice-oriented communication system has not satisfied the rapidly increasing user's service needs due to the relatively small transmission bandwidth and high usage fee. In addition, due to the development of the communication industry and increasing user demand for Internet services, there is an increasing need for a communication system capable of efficiently providing Internet services. As a result, it has been introduced into an OFDM-based broadband wireless access system to efficiently provide Internet service with broadband enough to meet the demand of rapidly increasing users.

The main services of the broadband wireless access system include the Internet, Voice over IP (VoIP), and non-real time streaming services. In addition, recently, a multicast broadcast service (MBS), which is a real-time broadcasting service, is emerging as a new service. The broadcast service is a multicast broadcast service (MBS) or a multicast and broadcast service (MCBCS) in the case of WiMAX according to a standard group or applied system. WCDMA may be called MBMS (Multi media Broadcast and Multicast Service), CDMA may be called BCMCS (Broadcast / Multicast Service), and may also be called DMB, MediaFLO, or the like.

The MBS may provide video services such as news, drama, sports relay, data services such as radio music broadcasting, and real-time traffic information. In addition, the MBS can simultaneously transmit various channels such as high-definition video and high-quality audio due to the high data rate using the macro diversity technique. Here, the macro diversity scheme means transmitting the same data at the same resource and at the same time for each MBS zone.

On the other hand, multiple NSPs (Network Service Providers) provide broadcasting services desired for a single NAP (Network Access Provider) worldwide, or a single NSP provides broadcasting services desired for a plurality of NAPs. Being able to provide is a big flow. As such, there may be a relationship of NSP: NAP = n: m for a virtual network or a virtual network. For example, a single physical NAP may logically include several virtual NAPs. have. Therefore, there is a need for a flexible and optimized network structure that meets this flow. To realize this, ND & S (Network Discovery and Selection) function is defined in the specification of transmission end such as IEEE 802.16. Since the ND & S providing method is well known, a detailed description thereof will be omitted.

The following should be considered when designing the network structure.

(1) A broadcast zone ID (MBS zone ID) for identifying a broadcast area of a network access provider (NAP) and a MAC layer ID for identifying a broadcast channel between a NAP and a terminal are required.

(2) When MCBCS servers belonging to different NSPs for one NAP radio network allocate their respective broadcast zone IDs and MAC layer broadcast channel IDs, NAP resources may be wasted. For example, when different service providers (SPs) provide services for the same broadcast content, resource waste may occur because the same content may be repeatedly transmitted through one base station. Of course, if different data encryption is applied for each NSP even for the same content, a separate MAC layer broadcast channel ID must be used.

(3) One broadcast zone may be composed of at least one base station, and should be managed by at least one base station controller.

(4) The terminal should be able to receive a broadcast in an idle or dormant state. To this end, when a user changes a broadcast channel, the user should be able to process broadcast reception in the terminal without a separate interworking procedure with the network.

(5) The terminal should be able to decode and utilize the broadcast zone ID broadcast from the base station and the broadcast channel ID of the MAC layer.

(6) The network entity communicating with the terminal through the application layer should be located in the core service network (CSN). That is, the NE in the area of the ASN or NAP cannot communicate with the terminal through the application layer.

(7) NAP shall manage radio channel service requirements of different NSPs in an integrated manner so that no waste of radio resources occurs. Of course, NAP can be one of NSPs.

That is, in the case of providing a broadcast service through a wireless network, a flexible and optimized network structure that can satisfy all of the above requirements is required.

Accordingly, an object of the present invention is to provide a network structure and a control method for providing a broadcast service through a wireless network.

Another object of the present invention is to provide a network structure and a control method for providing a broadcast service for a plurality of NSPs for a single NAP.

Another object of the present invention is to provide a network structure and a control method for one NSP to provide a broadcast service for a plurality of NAPs.

It is still another object of the present invention to provide a network structure and a control method for allocating a broadcast zone identifier and a broadcast channel identifier of a MAC layer in a NAP.

Another object of the present invention is to provide a network structure and a control method for delivering information for a service guide from the NAP to the NSP, the NSP configures the service guide to deliver to the terminal through the application layer.

It is still another object of the present invention to provide a network structure for controlling NAP broadcast channel requirements of different NSPs and a control method thereof.

According to an aspect of the present invention for achieving the above object, in a network for providing a broadcast service through a wireless network, located in the NAP (Network Access Provider) area, broadcast-related information from at least one MCBCS server and Create a mapping table by comprehensively determining the resources of the NAP, MBS server for delivering the generated mapping table to the MCBCS server, NSP (Network Service Provider) located in the area, mapping table from the MBS server The MCBCS server for generating a service guide using the service guide and delivering the service guide to a terminal through an application layer, and broadcasting content from the MCBCS server or a content provider (CP) located in the NAP area. Perform data / time synchronization and multiply the synchronized broadcast packet to base stations in the same MBS zone. MBS controller for casting, and requesting the service guide to the MCBCS server through the application layer, characterized in that it comprises a terminal for receiving and storing the service guide from the MCBCS server.

According to another aspect of the present invention, in a communication method in a network for providing a broadcast service through a wireless network, the MBS server located in the NAP area, the broadcast-related information from at least one MCBCS server and the resources of the NAP Generating a mapping table by comprehensively determining the number of steps, the MBS server transferring the generated mapping table to a corresponding MCBCS server, and the MCBCS server located in an NSP area. Generating a service guide using a mapping table from a server, requesting a service guide from the terminal to the MCBCS server through an application layer, and distributing the service guide by the MCBCS server. It is characterized by including

As described above, the present invention proposes a flexible and optimized network structure capable of providing a broadcast service through a wireless network. The network structure according to the present invention can prevent the waste of radio resources because the NAP allocates the broadcast channel identifiers of the NAP network broadcast zone and the MAC layer. In addition, there is an advantage that a plurality of NSPs can flexibly provide a desired broadcast service for one NAP or one NSP for a plurality of NAPs. In addition, the terminal may change the channel without a network interworking procedure even in the idle state through a service guide (mapping table) obtained from the NSP.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, the present invention will propose a network architecture (network architecture) capable of providing a broadcast service through a wireless network.

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

In the following description, a name of a network entity (NE) is defined according to a corresponding function, and may be changed according to the intention of the standardization group and the operator. For example, the base station may be called an access point (AP), a radio access station (RAS), a node-B, or a base station (BS). In addition, the base station controller may be referred to as a radio network controller (RNC), a base station controller (BSC), an access control router (ACR), or an access service network gateway (ASN-GW). Here, the ASN-GW may perform a router function as well as a base station controller function.

In addition, the following wireless network describes an OFDM / OFDMA-based broadband wireless access system by way of example, but the network structure according to the present invention can be easily applied to other wireless systems.

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

As shown, the network structure can be largely divided into a NAP region and an NSP region. Here, the base station (BS) 13, the base station controller (ASN_GW) 12, and the MBS server 11 belong to the NAP area, and the MCBCS server 10 is an NSP area (CSN: Core Service Network). Belongs to. The network consisting of the base station controller 12 and the base station 13 is defined as an access service network (ASN). In addition, the MCBCS server 10 and the MBS server 11 may be a function entity, and may exist as separate servers as shown, or may be located in another network entity NE of a corresponding area (NSP or NAP). have. For example, the MBS server function may be located in the ASN_GW or in an integrated OMC (also called EMS or WSM). Here, one integrated OMC may exist per NAP. In addition, when the NSP and the NAP are the same, the functions of the MCBCS server 10 and the MBS server 11 may be integrated and located in the same network entity.

Referring to FIG. 1, first, the MCBCS server 10 is located in an NSP area and is a functional entity that each service provider (SP) may have. It has an interface with an external broadcasting content server (or a content provider) and an AAA (Authentication, Authorization, Accounting) server, and service area information (broadcast provisioning information) that the NSP is in charge of and broadcasting schedule information about the service area ( The broadcast channel list, a content ID for each broadcast channel, a program ID, an IP layer identifier, a service time, a transmission rate, and a quality of service (eg, packet error rate) are transmitted to the MBS server 11. In this case, the service area information may use a pre-negotiated area identifier between a service provider (SP) and a network provider (AP) and may use an MBS zone ID. NAP is responsible for mapping between MBS zone ID and BSID, and when using pre-negotiated area identifier between SP and AP, it is assumed that NAP is responsible for mapping between pre-negotiated area identifier and MBS zone ID. In the following description, it is assumed that the MBS zone ID is used. In addition, the MCBCS server 10 has a function of transmitting a service authorization key (for example, an encryption key) and a life time for each content to a terminal, and a service guide (broadcast schedule, upper layer ID and MAC layer ID mapping table). ) Is transmitted to the terminal through the application layer. In addition, the MCBCS server 10 performs a function of transmitting broadcast traffic to the NAP network according to a broadcast schedule.

The MBS server 11 is located in the NAP area and performs a function for comprehensively determining the requirements of different SPs and the situation of the NAP network (base station controller, base station, WSM, etc.) to provide an optimized broadcast service. The MBS server 11 manages all resources (eg, NAP broadcast zone, broadcast channel ID of the MAC layer, multicast IP between the base station controller and the base station) of the NAP network (ASN) related to broadcasting. The MBS server 11 comprehensively determines information (service area information and broadcast schedule information for a corresponding service area) provided from different MCBCS servers 10 and resources of the NAP network for each broadcast channel. Determine MCID and air scheduling information. The MBS server 11 generates a mapping table by using the determined MCID and the air scheduling information, and transfers the generated mapping tables to the corresponding MCBCS servers 10. Then, the MCBCS server 10 generates a service guide using the mapping table from the MBS server 11. In addition, the MBS server 11 transmits broadcast traffic from the MCBCS server 10 or another content provider (CP) (not shown) to the base station controller 12.

The base station controller 12 manages connection and mobility of subscribers, and allocates a unique service flow (SF) for each UL / DL. It also has an interface with a CSN such as an AAA server. The MBS controller is configured in an access service network (eg, a block in ASN_GW), performs a data / time synchronization function for broadcast traffic from the MCBCS server 10 or a content provider, and performs the data / time synchronization. The time-synchronized broadcast packet is multicasted to base stations in the same MBS zone.

The MCBCS server 10 may trigger a content server (content provider) so that the content provider directly transmits the content to the MBS server 11 and provides the content from the MBS server to the base station controller.

The base station 13 has a wireless interface with the terminal, and transmits broadcast content from the MBS controller in the base station controller 12 through a predetermined resource at a predetermined time. Here, base stations belonging to the same MBS zone broadcast the same content at the same time for multi-BS MBS. Here, subregions far away from each other may be configured as a single MBS zone.

Meanwhile, the terminal is a subject that consumes a broadcast service. The terminal receives a service guide (including a mapping table) from the MCBCS server 10 through an application layer in order to receive, change channels, and delete broadcast traffic even in idle mode (calling dormant mode). When the terminal requests the service guide, it is necessary to include the terminal identifier (eg, NAI) in the request message. The NAI obtained from the EAP procedure of the initial access procedure may be used as it is, or the MAC or IP address of the terminal may be used as the NAI. It may be. In the latter case, if the encryption layer is encrypted in a form that can be understood by the MCBCS server or the AAA in the corresponding layer inside the terminal and uploaded to the client program, the client program is included in the request message and the MCBCS server is included. The MCBCS server 10 authenticates the subscriber when the service guide request (or subscription request) is received from the terminal, and downloads the service guide to the terminal when the authentication is successful. A broadcast schedule (content ID, time, transmission rate, etc.), a multicast IP address, an MCID, an MBS zone ID, an encryption key, a life time of the encryption key, and the like. The broadcast message including the to identify the current MBS zone to which it belongs (eg using DCD), MBS zone information of neighboring base stations (eg NBR_ADV Information utilization) (e.g., using NBR-ADV), that is, the application layer of the terminal manages the broadcasting zone-specific mapping table (MAC layer ID vs. IP layer ID vs. higher layer ID) allowed for the user. When a broadcast channel is applied, the MAC layer ID (or IP layer ID) for the corresponding broadcast channel is transferred to the corresponding layer (MAC layer or IP layer), and the MAC layer decodes traffic for the corresponding MAC layer ID (MCID). In this way, since the terminal includes a mapping table, the terminal can receive a broadcast on an idle or a diagram without a separate interworking procedure with the base station. If only the broadcast zone is identified through the broadcast message (e.g., before reading the target BS, read NBR_ADV from the serving BS and check the DCD message of the target BS. Confirm), the terminal may receive a broadcast using a mapping table for the corresponding broadcast zone without a handover procedure.

If the terminal moves to the MBS zone, a brief look at the method for receiving a seamless MBS traffic as follows.

First, when in the serving MBS zone before moving, the terminal determines the target base station or subcell to move and determines the target MBS of the corresponding target base station or subcell. In general, the serving base station broadcasts a MAC layer message (eg, NBR-ADV message) including information of neighbor base stations, and the terminal acquires MBS zone (s) information for each BSID through the MBR-ADV message. can do. Therefore, the MAC layer of the terminal transmits the target MBS zone ID for the target base station to the client program (application layer), and the application layer of the terminal transmits the target MBS zone ID to the MCBCS server 10 to provide a service guide for the target MBS zone. You can request Alternatively, by acquiring an allowable (serving MCID: target MCID) mapping table for the serving MBS zone (s) and the target MBS zone (s) from the MCBCS server 10 in advance, the MBS traffic is received even when moving to the target MBS zone. can do.

Of course, if the service guide includes a mapping table for all MBS zones (or neighboring MBS zones considering the user's location) from the beginning, the terminal may move between MBS zones without interworking procedures with the MCBCS server 10 as described above. The broadcast channel can be received without interruption. That is, the MAC layer of the terminal may obtain a target MBS zone ID through the NBR-ADV message, and the application layer of the terminal may select and use a mapping table of the target MBS zone using the target MBS zone ID from the MAC layer. Can be.

Although not shown, a policy server, an AAA (Authentication, Authorization, Accounting) server, a network management server, and the like may be configured. The AAA server may manage authentication and billing information, and may include a subscription profile repository (SPR) function for managing profile information for each subscriber. In addition, the AAA server may manage the subscriber's broadcast service authorization information and the encryption key and the lifetime derived from the initial authentication. The network management server (WSM or EMS or OMC) is responsible for the maintenance and repair of the NE belonging to the ASN, and performs the function of delivering information necessary for the initialization and operation of each NE. The policy server is a network entity that enforces an operator policy and performs a function of delivering QoS requirements (QoS profiles) for each terminal (application layer) or service flow to the ASN.

If the NAP becomes one of the NSPs even though there are multiple NSPs in the CSN, the MBS server function may be included in the MCBCS server of the NSP owned by the NAP. In this case, since the corresponding MCBCS server includes the MBS server function, the MCBCS server is located at the boundary between the CSN and the NAP network, and the MCBCS servers of other NSPs communicate with the MCBCS server of the NSP owned by the NAP.

The relationship between broadcast channel IDs between protocol layers according to the present invention is as follows.

NSP broadcast zone ID: NAP broadcast zone ID = 1: 1 or 1: n or m: n

Application layer IP (content ID): (NAP broadcast zone ID, MAC layer ID) = 1: 1 or n: 1

IP layer ID of the packet delivered to the terminal: MAC layer ID (in single NAP broadcast zone) = 1: 1 or 1: n

GRE key (between ASN_GW and BS): (NAP broadcast zone ID, MAC layer ID) = 1: 1

Based on the contents of FIG. 1 described above, the functions of the network entity according to the present invention are summarized in Table 1 below.

NE Functions Location Contents Server Contents Generation File repository Contents Provider (CP) MCBCS Server (NSP) Subscription management Service guide provisioning NSP zone ID & IP layer ID allocation & management Service guide distribution to MS User authentication & authorization Key management & distribution Contents protection Stream / file transmission User Interaction Multicast group management Notification & alert Service Provider (CSN) MBS Server (NAP) C-Plane -NSP Zone ID & NAP Zone ID mapping allocation -NSP IP ID & NAP MAC ID mapping allocation -NAP zone ID & NAP ASN_GW ID & BSID mapping -Air scheduling decision (permutation, MCS) -mapping table generation -mapping table Delivery to MCBCS server function -Support of multicast group management by MCBCS servers-Support of notification & alert by MCBCSC server U-Plane -Bearer Connection Setup & Release Network Operator (NAP) MBS Controller (ASN_GW) Data / Time Synchronization function based on NAP Zone ID & MAC ID management U-Plane -Bearer Connection Setup & Release Network Operator (NAP)

As shown in Table 1, NAPs related to broadcasting, such as mapping of NSP zones to NAP zones (MBS zones), mapping of NSP IP layer IDs to NAP MAC layer IDs, and mapping of NAP zone IDs to ASN_GW IDs and BS IDs. All resources are managed on the MBS server. In addition, the MBS server delivers the mapping table generated through the above mapping to the MCBCS server, the MCBCS server generates a service guide using the mapping table from the MBS server, and the service guide through the application layer Distribute to the terminal. In Table 1, the MBS controller function of ASN_GW may be classified into an MBS proxy for signaling and an MBS Data Path Function (DPF) for bearer traffic processing.

By placing the MBS server function in the NAP as described above, it is easy to configure a broadcast channel of a region overlapped by a plurality of SPs as a separate MBS zone.

That is, various combinations of NSP broadcast zones and NAP broadcast zones can be operated. That is, the relationship of NSP broadcast zone: NAP broadcast zone = n: m is possible. In detail, when a plurality of virtual NAP networks are configured for one physical NAP network, one MBS server may manage the plurality of virtual NAP networks. Similarly, when one service provider configures a plurality of virtual NSP networks, one MCBCS server may manage the plurality of virtual NSP networks. In this case, a relationship of NSP broadcast zone: NAP broadcast zone = n: m is possible. Therefore, various identifiers (eg, NSP zone identifier, NAP zone identifier, broadcast channel identifier, etc.) in the present invention should be generated in consideration of a virtual zone (virtual NSP zone, virtual NAP zone).

On the other hand, as mentioned above, the MBS server function may be located in a specific network entity in the NAP network. For example, the network operator may configure one specific ASN_GW for each MBS zone as an anchor ASN_GW serving as an MBS server. When multiple ASNs exist in the NAP network, a specific ASN_GW for each ASN or MBS zone may be set as an anchor ASN_GW serving as an MBS server.

In this case, the MCBCS server 10 provides the service area (eg, MBS zone) information and the broadcast schedule information for the service area that the user wants to broadcast to the anchor ASN_GW. In this case, the service area information may use a pre-arranged area identifier or a MBS zone ID between the service provider (SP) and the network operator (AP). The broadcast schedule information may include a list of broadcast channels, a higher layer identifier for each broadcast channel, a service time, a transmission rate, a required quality of service (eg, PER), and the like.

The anchor ASN_GW determines the information (MBS zone ID and broadcast schedule information) and NAP policy (resource) received from at least one MCBCS server 10 comprehensively and determines MCID and air scheduling information for each broadcast channel. . The anchor ASN_GW generates a mapping table for each MCBCS server 10 using the determined MCID and air scheduling information, and provides the generated mapping table to the corresponding MCBCS server 10. Thereafter, the MCBCS server 10 generates a service guide (including a broadcast schedule and a mapping table) using a mapping table provided from at least one anchor ASN_GW. The generated service guide is delivered to the terminal through an application layer protocol (eg HTTP).

Hereinafter, an overall procedure for broadcast reception of a terminal based on the network structure of FIG. 1 described above will be described.

2 illustrates an overall procedure for broadcast reception in a network structure according to an embodiment of the present invention.

Referring to FIG. 2, first, the MBS server 22 of the NAP negotiates with the ASNs 21 in the NAP network in step 201 to collect information on the NAP policy and the NAP resource. In addition, the MBS server 22 negotiates with the MCBCS server 23 in step 203 to collect service area information desired by the SP and broadcast schedule information about the service area. At this time, the MBS server 22 broadcast schedule information (including the broadcast channel list, the upper layer (IP) identifier for each broadcast channel, service time, transmission rate, quality of service, etc.) from different service providers (SP) and the desired broadcast Zone information and the like can be obtained, and the situation of the NAP (such as location and identifier information of a base station capable of providing macro diversity) can be obtained from the ASN.

After collecting the information necessary for the broadcast service, the MBS server 22 processes the information (service area information and corresponding broadcast schedule information) received from the different MCBCS servers 23 and the policy of the NAP in step 205. By comprehensively determining, the MCID and the air scheduling information are determined for each broadcast channel. The MBS server 22 generates a mapping table for each MCBCS server 23 using the determined MCID and air scheduling information. That is, the MBS server 22 manages all resources of NAP related to broadcasting (for example, MBS zone, MAC layer broadcasting channel ID, multicast IP address between base station controller and base station, GRE key for identifying broadcasting channel, etc.). do.

After that, the MBS server 22 transfers the generated mapping table to the MCBCS server 23 of the corresponding NSP in step 207. Then, the MCBCS server 23 generates a service guide using the mapping table from the MBS server 22 in step 209 and stores the generated service guide. At this time, the service guide for the NSP broadcast schedule information (content ID, program ID, time, transmission rate, etc.), multicast IP address, MCID, MBS zone ID, encryption key and effective time, etc. The MCBCS server 22 is a terminal It is a network entity of the CSN (Core Service Network) that can communicate with the 20 through the application layer.

The above process may be performed whenever a service guide reconfiguration is necessary due to join of a new SP or change of a broadcast schedule of an existing SP.

On the other hand, if the user wants to receive the service guide, the terminal 20 requests the service guide to the MCBCS server 23 through the application layer communication in step 211. The service guide request may be automatically performed inside a user's key action or terminal. In detail, the MAC layer of the UE may obtain the MBS zone ID of the serving cell through a message (eg, a DCD message) broadcasted by the serving cell (subcell). The client program (application layer) of the terminal requests the MBS zone ID of the corresponding subcell to the MAC layer, and transmits a service guide request message including the MBS zone ID from the MAC layer to the MCBCS server 23. This request procedure may be referred to as a service guide request procedure, a subscription request procedure, or a user registration request procedure.

When the service guide is requested from the terminal 20, the MCBCS server 23 distributes the service guide for the MBS zone ID to the terminal 20 in step 213. In this case, the MCBCS server 23 may perform service authentication in association with an authentication server if necessary. The service guide may include broadcast schedule information (content ID, time, transmission rate, etc.), IP layer ID (multicast IP address), MAC layer ID (MCID), encryption key, and valid time.

In another embodiment, the terminal may transmit a service guide request (or subscription request or user registration request) message to the MCBCS server 23 without the MBS zone ID. In another embodiment, the MCBCS server 23 may transmit the service guide to the terminal in a push mode according to the user's pre-registration information without requesting the terminal. In this case, since the MCBCS server 23 does not know the MBS zone to which the terminal belongs, the MCBCS server 23 does not know which MBS zone (s) the terminal belongs to in the ASN (or network entity managing the information (location) of the terminal). You should inquire. That is, when the service guide is requested without the MBS zone ID, or when the service guide is distributed in the push mode, the MCBCS server 23 requests the MBS zone ID to which the current terminal belongs to the ASN 21, the ANS The service guide according to the MBS zone ID from 21 may be transmitted to the terminal through an application layer.

Meanwhile, the MCBCS server 23 may transmit a service guide directly to the terminal 20 through application layer communication as shown, or, as another example, trigger the MAC layer call generation interworking procedure (for example, DSA) through the ASN. Through the -REQ message, the [broadcast channel IP vs MAC layer ID] mapping table for the corresponding MBS zone can be transmitted. As another example, when the UE transmits the DSA-REQ including the MBS zone ID, the UE transmits the request in the order of the base station, the base station controller, the MBS server, and the MCBCS server, and in reverse order, the [broadcast channel IP vs. MAC layer ID for the corresponding MBS zone. By transmitting the mapping table, the base station may finally put a service guide (mapping table) in the DSA-RSP and transmit the same to the terminal. As another example, the terminal receives a [broadcast channel IP vs. MAC layer ID] mapping table for a corresponding MBS zone through a message broadcast from a base station (eg, DCD) or a specific MAC layer broadcast channel ID (MCID). A service guide including a [broadcast channel IP vs. MAC layer ID] mapping table for a corresponding MBS zone may be received through a data burst of. The service guide included in the data burst is generated by the MCBCS server and delivered to the NAP network. If the terminal knows the MCID or the broadcast message of the data burst carrying the service guide, the service guide request procedure through the application layer may be omitted.

Meanwhile, the terminal 20 stores the service guide received in step 215. In this case, the service guide may include a broadcast schedule and a mapping table. The mapping table may be implemented in various forms. For example, the broadcast zone and each broadcast channel of the NSP & NAP allowed in the terminal may be configured as [MAC layer ID vs. higher layer ID or IP layer ID vs. application layer ID].

If the broadcast data encryption function of the MAC layer is used, the MAC layer ID is required for decoding. That is, [IP layer ID vs. application layer ID] can be used when there is no encryption function of the MAC layer. In this case, since the application layer of the UE does not need the MAC layer channel ID, the MBS server includes the MAC layer channel ID. There is no need to pass the mapping table to the MCBCS server. If all layers do not use the data encryption function, only the broadcast zone and the application layer ID for each broadcast channel can receive data of a desired broadcast channel. That is, the MAC layer and the IP layer of the terminal decode all broadcast channel data for the corresponding MBS zone to the application layer, and the application layer may select the desired broadcast channel data using the application layer ID. At this time, the application layer may check whether the desired broadcast channel can be received even if only the MBS zone information is acquired.

Meanwhile, the service guide distributed free of charge may not include the MBS zone ID and MCID. In this case, the application layer (client program) of the terminal obtains an MBS zone ID (MBS zone ID) serviced by the currently connected base station from the MAC layer. The MAC layer may obtain the MBS zone ID through a message (eg, a DCD message) broadcast from the base station. After acquiring the MBS zone ID from the MAC layer, the application layer of the terminal performs a separate subscription procedure (or user registration procedure) corresponding to the service guide (content ID vs. broadcast channel IP address vs vs. MBS zone ID). MCID mapping table, encryption key and valid time) are received from the MCBCS server. Then, when the user selects a specific broadcast channel, the MAC layer of the terminal decodes the broadcast data for all MCIDs of the MBS zone to the IP layer, the IP layer is a broadcast channel IP corresponding to the content ID selected by the user Select broadcast data of address and upload to application layer.

In operation 217, the MCBCS server 23 delivers the broadcast content to the ASN according to the broadcast schedule. In this case, the broadcast content may be delivered to the ASN via the MBS server 22 or directly to the ASN. In step 219, the ASN performs packet and time synchronization on the broadcast content received from the CSN, and wirelessly transmits the synchronized packet at the absolute broadcast time in step 221. Here, the packet and time synchronization is a process for wirelessly transmitting a broadcast packet in absolute time without division and packing at a base station, and may be performed in an MBS controller (functional block) in an ASN. Since the MBS server also belongs to the ASN, synchronization may be performed by one of the MBS server, the base station controller, or the base station, or may be performed in a plurality of NEs by dividing a time stamping and packetization function.

On the other hand, when the user applies for a broadcast channel, the terminal 20 obtains the MAC layer ID for the requested broadcast channel from the mapping table in step 223 and uses the obtained MAC layer ID (MCID). Receive the corresponding broadcast channel. If only the IP layer ID of the applied broadcasting channel is known, the PHY & MAC layer of the terminal decodes the traffic of all the broadcasting channels to the IP layer, and the IP layer selects only the traffic with the corresponding IP address and the application layer. Can be raised with As such, the broadcast channel may be received in various forms according to the form of the mapping table.

As described above, when the terminal acquires the service guide from the MCBCS server, the terminal may receive the desired broadcast channel even without the interworking procedure with the base station even in the idle state. In addition, in case of handover, the UE can check the MBS zone through a broadcast message (eg, DCD, DL-MAP, etc.). The desired broadcast channel can be continuously received.

Hereinafter, the configuration of each network entity NE in the network structure according to the present invention will be described.

3 illustrates a configuration of an MCBCS server according to an embodiment of the present invention.

As shown, the MCBCS server 10 includes a control unit 300, a communication unit 302, a content storage unit 304, and a service guide storage unit 306. Here, it is assumed that the communication unit 302 performs the physical layer processing, and then the processing for the higher protocol layer is performed by the controller 300. In addition, it is assumed that the controller 300 is equipped with an application layer protocol (eg, HTTP) for the application layer communication with the terminal.

Referring to FIG. 3, the communication unit 302 physically processes and transmits a transmission packet from the control unit 300, and physically processes the received packet and provides the received packet to the control unit 300.

The controller 300 controls the overall operation of the MCBCS server 10 and is in charge of protocol processing. The controller 300 stores content from an external content provider (CP) in the content storage unit 304 and selects the corresponding content from the content storage unit 304 according to a service guide (broadcast schedule). Pass to NAP (ASN).

In addition, the control unit 300 transmits the desired service area information and broadcast schedule information for the service area to the MBS server 11 of the NAP, and the mapping table (MCID and each broadcasting channel) from the MBS server 11; Air scheduling information). The controller 300 constructs a complete service guide for application layer communication by using the mapping table from the MBS server 11 and stores the configured service guide in the service guide storage unit 306. In this case, the service guide may include broadcast schedule information and mapping table information. In addition, when a service guide request is received from the terminal through the application layer, the controller 300 transmits the service guide stored in the service guide storage unit 306 to the terminal through the application layer. In this case, the controller 300 may filter only the service guide of the MBS zone to which the terminal belongs and transmit it to the terminal.

4 illustrates a configuration of an MBS server according to an embodiment of the present invention.

As shown, the MBS server 11 includes a control unit 400, a communication unit 402, a mapping table configuration unit 404, and a mapping table storage unit 406. Here, it is assumed that the communication unit 402 performs the physical layer processing, and then the control for the higher protocol layers is performed by the control unit 400.

Referring to FIG. 4, the communication unit 402 physically processes and transmits a transmission packet from the control unit 400, and provides a physical layer processing of the received packet to the control unit 400.

The controller 400 controls the overall operation of the MBS server 11 and is in charge of protocol processing. The controller 400 negotiates with the necessary ASNs in the NAP to collect information on the policy and resources of the ASN, and negotiates with the MCBCS server 10 to provide service area information (eg, MBS zone ID) desired by the corresponding SP and the corresponding information. Collect broadcast schedule information for service area. In this case, the control unit 400 may obtain a broadcast schedule (including broadcast channel IP information, transmission rate, etc.), NSP broadcast zone prevision information (desired service area information), and the like from different service providers (SPs), and from the ASN. The situation of the NAP (such as location and identifier information of a base station capable of providing macro diversity) can be obtained.

Mapping table configuration unit 404 determines the MCID and air scheduling information for each broadcast channel using the information from the control unit 400, and mapping table for each of the MCBCS server 10 using the determined information Create In this case, the mapping table may include (upper layer ID vs. MAC layer broadcast channel ID) and air scheduling information for each broadcast channel.

Meanwhile, the controller 400 stores the mapping table configured in the mapping table configuration unit 404 in the mapping table storage unit 406 and simultaneously transfers the mapping table to the corresponding MCBCS server 10. In addition, the mapping table storage unit 406 is all resources of the NAP related to the broadcast (for example, MBS zone, MAC layer broadcast channel ID, multicast IP address between the base station controller and the base station, GRE key for identifying the broadcast channel, etc.) Can manage.

5 illustrates a configuration of a terminal according to an embodiment of the present invention.

As shown, the terminal is a radio frequency (RF) processing unit 500, a modem 503, a MAC (Media Access Control) layer processing unit 504, an IP (Internet Protocol) layer processing unit 506, an application layer (Application Layer) ) A processing unit 508 is configured.

Referring to FIG. 5, the RF processor 500 first processes a baseband signal from a modem 502 and transmits the RF through a antenna, and converts an RF signal received through the antenna into baseband sample data. To the modem 502.

The modem 502 is a block for physical layer encoding and decoding. In case of transmission, the modem 502 performs physical layer encoding processing (channel encoding, interleaving, modulation, OFDM modulation (or CDMA modulation), etc.) from the MAC layer processing unit 504 to the RF processing unit 500. To pass. In case of reception, the modem 502 performs physical layer decoding processing (OFDM demodulation (or CDMA demodulation), modulation, deinterleaving, channel decoding, etc.) of the signal from the RF processing unit 500 to the MAC layer processing unit 504. To pass.

The MAC layer processing unit 504 encodes a service data unit (SDU) from the IP layer processing unit 506 into a MAC packet data unit (MAP PDU), configures the MAC PDU in bursts, and delivers the burst to the modem 502. On the contrary, the MAC layer processor 504 extracts and decodes the MAC PDU from the received burst from the modem 502, assembles the MAC PDU into an SDU, and delivers the MAC PDU to the IP layer processor 506.

The IP layer processing unit 506 configures the application layer data from the application layer processing unit 508 as an IP packet (SDU) and delivers the data to the MAC layer processing unit 504, and conversely, the IP packet from the MAC layer processing unit 504. To be assembled into application layer data and transferred to the application layer processing unit 508.

Looking at the operation of the present invention based on the structure of Figure 5 as follows.

First, when it is necessary to receive a service guide, the application layer processing unit 508 generates an application layer (eg, HTTP) message requesting the service guide and transmits it to the MCBCS server 10, and in response, the service guide (broadcast schedule, An application layer message including a mapping table) is received from the MCBCS server 10. The service guide thus received is managed by the application layer processor 508. Here, the mapping table indicates, for example, [MAC layer ID vs. higher layer ID or IP layer ID vs. application layer ID] for each broadcast channel with respect to the NSP broadcast zone and & NAP broadcast zone allowed in the terminal (or user). Include.

Then, when the user applies for the broadcast channel, the application layer processing unit 508 obtains a lower layer ID (eg, MAC layer ID) for the broadcast channel requested by the user from the mapping table, and corresponds to the lower layer ID. To the layer. Here, it is assumed that the MCID is delivered to the MAC layer.

Then, the MAC layer processor 504 decodes the burst with the MCID among the received bursts from the modem 506 and delivers the burst to the application layer 508. The application layer 508 reproduces the broadcast traffic received from the lower layer. If the mapping table is configured with [content ID vs. IP layer ID] for each broadcast channel, the PHY layer (modem) and the MAC layer of the terminal decode traffic of all broadcast channels and upload them to the IP layer processor 506. Should give In this case, the IP layer processing unit 506 selects only the traffic having the corresponding IP address from all the broadcast traffic and delivers it to the application layer.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating a network structure according to an embodiment of the present invention.

2 is a diagram illustrating an overall procedure for broadcast reception in a network structure according to an embodiment of the present invention.

3 is a diagram illustrating a configuration of an MCBCS server according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of an MBS server according to an embodiment of the present invention.

5 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention.

Claims (31)

In a network for providing a broadcast service through a wireless network, MBS located in a network access provider (NAP) area to generate a mapping table by comprehensively determining broadcasting related information from at least one MCBCS server and resources of the NAP, and transferring the generated mapping table to a corresponding MCBCS server. Server, Located in the NSP (Network Service Provider) area, the network comprises a MCBCS server for generating a service guide using the mapping table from the MBS server, and delivers the service guide to the terminal through the application layer . The method of claim 1, The MBS server is a network, characterized in that one of the functional block mounted on the independent server, the functional block mounted on the ASN_GW, OMC (operating and maintenance center). The method of claim 2, The network characterized in that a specific ASN_GW for each MBS zone to set the anchor ASN_GW equipped with the MBS server function. The method of claim 1, The broadcast associated information includes a service area information desired by the SP and a broadcast schedule information on the service area. The method of claim 4, wherein The service area information is at least one of a pre-negotiated area identifier and MBS zone ID between the SP and NP. The method of claim 4, wherein The broadcast schedule information includes at least one of a broadcast channel list, a higher layer identifier for each broadcast channel, a service time, a transmission rate, and quality of service information. The method of claim 1, And the mapping table includes mapping information between higher layer ID and MAC layer ID for each broadcast channel. The method of claim 1, The service guide includes at least one of broadcast schedule information and a mapping table. The method of claim 1, Located in the NAP area, performs data / time synchronization for broadcast content from the MCBCS server or a content provider (CP) and transmits the synchronized broadcast packet to base stations in the same MBS zone. The network further comprises an MBS controller for multicasting. The method of claim 9, The MBS controller is a network characterized in that it is composed of an internal block of the MBS server or ASN_GW. The method of claim 1, Requesting a service guide to the MCBCS server through the application layer, receiving and storing the service guide from the MCBCS server, and further comprising a terminal for receiving a desired broadcast channel using the service guide without interworking with the base station Featured network. The method of claim 1, The MCBCS server is configured to manage user subscription management, service guide provisioning, NSP zone ID, NSP broadcasting zone ID, and IP layer ID allocation and management (NSP zone ID & NSP Broadcasting Zone ID & IP). layer ID allocation & management, service guide distribution to MS, user authentication & authorization, key management & distribution, content protection, A network, which performs at least one of stream / file transmission, user interaction, multicast group management, and notification & alert functions. The method of claim 1, The MBS server includes NSP zone ID, NSP broadcasting zone ID and NAP broadcasting zone ID mapping allocation (NSP Zone ID & NSP Broadcasting Zone ID & NAP Broadcasting Zone ID mapping allocation), NSP IP layer ID and NAP MAC layer ID mapping. NAP IP ID & NAP MAC ID mapping allocation, NAP zone ID & NAP ASN_GW ID & BSID mapping, Air scheduling decision, mapping table generation, MCBC Mapping table delivery to MCBCS server function, support of multicast group management by MCBCS servers, and support of notification & alert by MCBCS server servers) A network characterized by performing at least one of the functions. The method of claim 1, When configuring at least one virtual NAP network for one physical NAP network, the MBS server manages at least one virtual NAP network, when one service provider configures at least one virtual NAP network And the MCBCS server manages at least one virtual NSP network. The method of claim 14, Wherein the MBS server and the MCBCS server generate various broadcast-related identifiers in consideration of the virtual NAP network and the virtual NAP network. A communication method in a network for providing a broadcast service through a wireless network, Generating, by the MBS server located in the NAP region, a mapping table by comprehensively determining broadcast related information from at least one MCBCS server and resources of the NAP; Transferring, by the MBS server, the generated mapping table to a corresponding MCBCS server; And generating, by the MCBCS server located in an NSP area, a service guide using a mapping table from the MBS server. The method of claim 16, The MBS server, characterized in that the server is one of the functional block mounted on the ASN_GW, OMC (Operating and Maintenance Center). The method of claim 17, And setting one specific ANS_GW for each MBS zone to an anchor ANS_GW equipped with the MBS server function. The method of claim 16, The broadcast associated information includes service area information desired by a corresponding SP and broadcast schedule information on the service area. The method of claim 19, The service area information, characterized in that at least one of the pre-negotiated area identifier and MBS zone ID between the SP and NP. The method of claim 19, The broadcast schedule information may include at least one of a broadcast channel list, a higher layer identifier for each broadcast channel, a service time, a transmission rate, and quality of service information. The method of claim 16, And the mapping table includes mapping information between higher layer ID and MAC layer ID for each broadcast channel. The method of claim 16, The service guide includes at least one of broadcast schedule information and a mapping table. The method of claim 16, The MBS controller located in the NAP region performs data / time synchronization on broadcast content from the MCBCS server or a content provider (CP) and uses the same broadcast packet for the synchronized broadcast packet. And multicasting to zone base stations. The method of claim 24, The MBS controller is characterized in that the configuration of the internal block of the MBS server or ASN_GW. The method of claim 16, Requesting a service guide from the terminal to the MCBCS server through an application layer; The MCBCS server, characterized in that further comprising the step of distributing a service guide of the terminal. The method of claim 26, And receiving, by the terminal, a desired broadcast channel using the mapping table without interworking with a base station. The method of claim 16, The MCBCS server is configured to manage user subscription management, service guide provisioning, NSP zone ID, NSP broadcasting zone ID, and IP layer ID allocation and management (NSP zone ID & NSP Broadcasting Zone ID & IP). layer ID allocation & management, service guide distribution to MS, user authentication & authorization, key management & distribution, content protection, At least one of stream / file transmission, user interaction, multicast group management, and notification & alert. The method of claim 27, The MBS server includes NSP zone ID, NSP broadcasting zone ID and NAP broadcasting zone ID mapping allocation (NSP Zone ID & NSP Broadcasting Zone ID & NAP Broadcasting Zone ID mapping allocation), NSP IP layer ID and NAP MAC layer ID mapping. NAP IP ID & NAP MAC ID mapping allocation, NAP zone ID & NAP ASN_GW ID & BSID mapping, Air scheduling decision, mapping table generation, MCBC Mapping table delivery to MCBCS server function, support of multicast group management by MCBCS servers, and support of notification & alert by MCBCS server Performing at least one of the MCBCS servers) function. The method of claim 16, When configuring at least one virtual NAP network for one physical NAP network, the MBS server manages at least one virtual NAP network, when one service provider configures at least one virtual NAP network And the MCBCS server manages at least one virtual NSP network. The method of claim 30, Wherein the MBS server and the MCBCS server generate various broadcast-related identifiers in consideration of the virtual NAP network and the virtual NAP network.

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