KR100678141B1 - System and method for offering broadcast service in a wireless communication system - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention is an invention of a system and method for providing a broadcast service in a wireless communication system.

I. The technical problem to be solved by the invention

The present invention can prevent the waste of resources and radio resources of the network, and provides a system and method that can provide a broadcast service mainly in the mobile terminal.

All. Summary of Solution of the Invention

The present invention relates to a system and method for providing a broadcast service in a wireless communication system. In particular, in a mobile communication system providing a broadcast service, an overhead message and broadcast traffic including broadcast related information for at least one neighboring base station are provided. And a serving base station for transmitting the broadcast traffic, a neighbor base station for receiving the broadcast traffic from the serving base station and transmitting the broadcast traffic, and a mobile terminal for receiving the broadcast traffic from the serving base station and the neighbor base station. .

la. Important uses of the invention

Used when providing a broadcast service in a wireless communication system.

Broadcast service, broadcast registration, mobile terminal location.

Description

System and method for providing broadcasting service in wireless communication system {SYSTEM AND METHOD FOR OFFERING BROADCAST SERVICE IN A WIRELESS COMMUNICATION SYSTEM}

1 is a diagram illustrating broadcast groups in the case of providing a broadcast service according to the prior art;

2 is a network diagram of an HRPD system capable of providing a broadcast service according to the present invention;

3 is a view for explaining providing a broadcast service from base stations according to the location of a mobile terminal according to the present invention;

4A and 4B illustrate a modified portion of a broadcast overhead message for broadcasting in an HRPD system according to the present invention;

5 is a view showing a modified portion of a broadcast overhead message for a CDMA2000 1x system according to the present invention;

6 is a control flowchart of a network for providing a broadcast service according to an embodiment of the present invention;

7 is a control flowchart of broadcasting registration in a mobile terminal according to an embodiment of the present invention;

8 illustrates an embodiment of a broadcast overhead message for broadcasting according to another embodiment of the present invention;

FIG. 9 is a control flowchart performed in a mobile terminal for receiving an header message according to the embodiment of FIG. 8 or 10 of the present invention; FIG.

10 is a diagram illustrating an example of a broadcast overhead message for broadcasting according to another embodiment of the present invention.

The present invention relates to a system and method for providing a broadcast service in a wireless communication system.

Typically, a system representing a wireless communication system is a mobile communication system. Such a mobile communication system has been developed to provide a voice service without restriction on a user's location, but is now evolving into a form for providing a wider variety of services. In this mobile communication system, one of the technologies currently being actively standardized in the 3GPP2 camp is broadcasting service.

Then, a scheme for providing a broadcast service in progress in the 3GPP2 standard negotiation in a high rate packet data service (HRPD) system called CDMA2000 1x or 1xEVDO has been proposed. Next, a brief description will be made of the broadcast service proposed up to now with reference to FIG.

To date, the proposed scheme for supporting broadcast services in HRPD designates several cells (or sectors) as one broadcast group. When there is a mobile terminal to listen to a broadcast in the one broadcast group, the corresponding broadcast traffic is transmitted to the entire broadcast group. Accordingly, the mobile terminal which wants to listen to the broadcast softens the signal of the corresponding broadcast traffic transmitted from the base stations in this group to increase the reception performance. In addition, when there is no mobile terminal to listen to the broadcast in one broadcast group, transmission of the corresponding broadcast traffic is stopped.

According to the above method, several cells (or sectors) are configured as one broadcast group to provide a broadcast service. Then, it is determined whether broadcast traffic is transmitted on a group basis. That is, when one or more mobile terminals are listening to a broadcast in a cell (or sector) in a group, the corresponding broadcast traffic is transmitted to the entire group. Otherwise, none of the group transmits the corresponding broadcast traffic. In such a system, a mobile terminal can be soft combined or soft handoff using only signals transmitted by base stations in a group to which the mobile terminal is located.

1 is a diagram illustrating a relationship between a base station and a mobile terminal in a unit of a broadcast service group according to the prior art. Next, the relationship between the base stations in the broadcast service group unit and the mobile terminal will be described with reference to FIG. 1.

It is assumed that six base stations 101, 102, 103, 104, 105, and 106 exist within the broadcast group 1 100, and six base stations 111, 112, also exist within the broadcast group 2 110. Assume that 113, 114, 115, 116 exist. In this case, it is assumed that the mobile terminal 130 included in the broadcast group 1 100 and the mobile terminals 140 and 150 included in the broadcast group 2 110 receive a broadcast service. In this case, the mobile terminal 130 included in the broadcast group 1 (100) receives a broadcast service through three base stations (104, 105, 106). In addition, one mobile terminal 140 included in the broadcast group 2 110 receives a broadcast service from two base stations 111 and 112 and the other mobile terminal included in the broadcast group 2 110. 150 receives a broadcast service from three other base stations 114, 115, and 116. In this case, each of the mobile terminals 130, 140, and 150 may soft combine the data of the broadcast service received from each base station.

Each of the mobile terminals 130, 140, and 150 may perform soft combining only with signals received from a base station included in each broadcast group. This is because the base stations of each broadcast group unit provide the same service to the mobile terminal, and other broadcast groups do not provide the broadcast service to the corresponding mobile terminal.

Therefore, when providing a broadcast service (BCMCS: Broad-Cast Multi-Cast Service) by the above method may have the following problems.

First, by turning on / off the transmission of broadcast traffic in units of a broadcast service group region, broadcast traffic may be unnecessarily transmitted from other base stations not received by the mobile terminal. For example, in the case of the base stations 101, 102, 103 of the broadcast group 1 100, the mobile stations 130 are base stations not provided with the broadcast service. As such, although the base station does not receive the broadcast service from the mobile terminal 130, all base stations in the broadcast service group transmit unnecessary broadcast traffic. Therefore, there is a problem that wastes unnecessary radio resources. In addition, unnecessary traffic increases in a radio access network (RAN).

Second, in the case of a mobile terminal at the boundary between broadcast groups, the reception state may be degraded. For example, if the mobile terminal 130 of the broadcast group 1 (100) is located adjacent to the broadcast group 2, the mobile terminal 130 is a soft coupling of the weak signals received from the broadcast group 1 (104, 105, 106) Must be used. In addition, the mobile terminal 130 may not receive the signal from the base station 112, which is a particular base station among the base stations of the broadcast group 2 (110). Accordingly, in the case of providing a broadcast service in this manner, the quality of the broadcast service may be reduced. This is because the mobile terminal 130 does not receive the corresponding broadcast service from the base station of the broadcast group 2 110, which is another broadcast group.

Accordingly, an object of the present invention is to provide a system and method for preventing waste of radio resources in a wireless communication system providing a broadcast service.

Another object of the present invention is to provide a system and method for preventing resource waste of a network in a wireless communication system providing a broadcast service.

Another object of the present invention is to provide a system and method for providing a high quality broadcast service to a mobile terminal in a wireless communication system providing a broadcast service.

Another object of the present invention is to provide an apparatus and method for requesting a broadcast service in a mobile terminal of a wireless communication system providing a broadcast service.

It is still another object of the present invention to provide a mobile terminal with a base station capable of performing a soft coupling in a wireless communication system providing a broadcast service by the mobile terminal can be provided with a broadcast service from the base station capable of soft coupling and In providing a method.

A method performed in a system according to the present invention for achieving the above object is a method for providing broadcast traffic according to the position of the mobile terminal in a system for providing a broadcast service to a mobile terminal receiving a broadcast service, When receiving a broadcast registration message from the mobile terminal, receiving the broadcast traffic requested from the mobile terminal from the broadcast server to provide to the mobile terminal, the base station information and the periodic broadcast registration that can be combined with the adjacent base station information and the broadcast traffic; And providing an overhead message including a message request and an aperiodic broadcast registration message request to the mobile terminal.

In addition, when a broadcast registration message is not received from a mobile station for a predetermined time from a mobile terminal, and the strength of a pilot signal of the base station received from a mobile terminal included in neighboring base stations of the base station is equal to or less than a predetermined threshold value, The method may further include releasing broadcast traffic transmitted from the base station.

In addition, before the broadcast traffic is released, a process of generating and transmitting an overhead message requesting aperiodic broadcast registration and providing the broadcast message when the broadcast registration message is not received within the aperiodic broadcast registration request time is provided. The method may further include releasing transmission of broadcast traffic.

In addition, the method may further include maintaining a transmission of broadcast traffic provided by the base station when a broadcast registration message is received within the aperiodic broadcast registration request time.

A method performed in a mobile terminal according to the present invention for achieving the above objects, and receives the broadcast traffic from the broadcast server to provide to the mobile terminal, the base station information and the periodic base station information and the flexible combination of the broadcast traffic is possible and periodically A method for receiving broadcast traffic in a mobile terminal of a wireless communication system providing an overhead message including a broadcast registration message request and an aperiodic broadcast registration message to a mobile terminal, the method comprising receiving the broadcast traffic included in the overhead message when receiving the broadcast traffic. Checking the reception strength of the pilot signal received from the neighbor base station according to whether the neighboring base station is softly coupled or not, and transmitting the reception strength of the pilot signal in the broadcast registration message for each period indicated in the received overhead message. It includes the process of doing.

In addition, the method performed in the mobile terminal checks whether a flexible combination of broadcast traffic received from the base station requesting the aperiodic broadcast registration is possible when there is an aperiodic broadcast registration request in the received overhead message. Checking whether the strength of the received pilot signal is greater than or equal to a predetermined threshold when soft coupling of broadcast traffic is possible from the base station; and broadcasting to the base station if the strength of the pilot signal is greater than or equal to a predetermined threshold. The method may further include transmitting a registration message.

A system of the present invention for achieving the above objects is a system for providing a broadcast service according to the mobile terminal receiving a broadcast service and the position of the mobile terminal, the reception of a pilot signal received from a neighboring base station upon reception of broadcast traffic; When the strength of the pilot signal is a value that can be combined with a broadcast registration message that transmits the strength information to the base station at a predetermined period and receives a non-periodic broadcast registration request signal from the flexible base station among the base stations. A mobile terminal for transmitting a periodic broadcast registration message, and when the broadcast traffic is requested from the mobile terminal, receives the requested broadcast traffic from a broadcast server and provides the mobile terminal to the mobile terminal, and enables flexible coupling of neighboring base station information and the broadcast traffic. Base station information and frequency And a broadcast registration message and the requirements of non-network for providing the overhead message containing a periodically broadcast registration message to a mobile terminal.

In addition, the network,

Transmitting the broadcast traffic to the mobile terminal through the broadcast channel, controlling base station transmission of the overhead message to the mobile terminal, and broadcast traffic of the base stations according to a request of the mobile terminal, A base station controller for controlling an overhead message to be transmitted from the base stations, a packet control function for controlling packet data transmission of the base station controllers, a packet connected to the packet control function and connected to a packet data network Can be configured as a data service node,

The network configuration of another method is

Control base stations for transmitting the broadcast traffic to the mobile terminal through the broadcast channel, transmitting the overhead message to the mobile terminal, controlling the base stations, and transmitting a message received from a higher level through the base station. A base station controller configured to control packet data transmission of the base station controllers, and to control the overhead message to be transmitted from the base stations, a packet control function unit connected to the packet control function unit, It can be configured as a packet data service node to be connected.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings.

In addition, in the following description, there are many specific details such as specific messages or signals, which are provided to aid the overall understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge. In the business card for describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

The method according to the present invention proposes a method for the mobile terminal to efficiently perform soft combining, and the operation of the mobile terminal and the network can be summarized as follows.

First, the operation of the mobile terminal will be described. A mobile terminal requesting a broadcast service may include a pilot signal received from a base station (Access Network Transceiver system, ANTS; the base station described below may be a base station including ANTS and ANC) to receive broadcast traffic. If the value is equal to or more than the appropriate level (eg, when the pilot reception size is equal to or larger than T_ADD), it is suitable for receiving broadcast traffic and informs the base station of a signal for requesting a broadcast service so that the corresponding base station transmits the corresponding broadcast traffic. However, if the base station is already transmitting the broadcast traffic, there is no need to inform it separately. In this case, only when the base station requests the strength of the pilot signal measured by the mobile station and broadcast traffic reception information, the mobile station transmits it to the base pole. In addition, the mobile terminal flexibly combines the broadcast traffic transmitted by the base stations capable of soft coupling to increase the reception performance. Whether or not soft coupling is determined using information included in a broadcast overhead message (e.g. Broadcast System Parameters Message or BroadcastOverhead Message) transmitted by the base station. The overhead message will be described in detail below.

Next, the network operation will be described. It determines whether to transmit broadcast traffic in each cell or each sector according to radio reception information (e.g. RER, RouteUpdate Message) transmitted by the mobile terminal. In addition, if there is no broadcast service registration message (BCMCS Registration Message) transmitted to a specific cell or sector for a predetermined time, the mobile terminal receiving the broadcast after checking whether there is actually a mobile terminal receiving the broadcast for a predetermined time exists. If not, broadcast traffic transmission stops. In other cases, there is no mobile terminal receiving a broadcast service in the cell or sector, and at the same time no mobile terminal in the neighboring cell or sector is receiving broadcast traffic transmitted in its cell or sector, i. If the reception strength of the pilot signal transmitted from this cell is not sufficient for the radio reception information transmitted by the mobile terminal in the cell and is not used for the soft coupling, whether there is no mobile terminal receiving the actual broadcast for a predetermined time. After the inspection, if there is no mobile terminal receiving the broadcast, transmission of the broadcast traffic is stopped.

2 is a network diagram of an HRPD system capable of providing a broadcast service according to the present invention. Hereinafter, the configuration and operation of an HRPD system for providing a broadcast service according to the present invention will be described with reference to FIG. 2.

First, each component constituting the HRPD system includes base stations (ANTS) 211, 212, 213, and 214, and base station controllers (ANC) 221 and 222, and a packet control function unit (PCF: Packet Control). Function (231), a Packet Data Service Node (PDSN) 241, and an Access Network-Authentication, Accounting and Authorization (AN-AAA) 250 for authentication in an HRPD system. In addition, a broadcast service controller (BCMCS Controller) 260 and a broadcast service server (BCMCS SERVER) 270 for providing a broadcast service to the HRPD system are connected.

The base stations 211, 212, 213, and 214 may provide various data services provided by a broadcast service or an HRPD system through a wireless channel with the mobile terminal 200, and are connected with base station controllers 221 and 222. do. Also, each base station controller 221, 222 controls base stations 211, 212, 213, 214 connected to the lower side, and is connected to the packet control function unit 231. The packet control function unit 231 is connected to the packet data service node 241 and can perform a broadcast service and various data services through the packet data service node 241. The packet data service node 241 is connected to the AN-AAA 250, which can perform authentication of the mobile terminal (AT) 200. In addition, the packet data service node 241 receives a broadcast service through the broadcast service server 270. In addition, the packet data service node 241 may be connected to the broadcast service controller 260 through the broadcast service server 270 or directly. The broadcast service server 270 and the broadcast service controller 260 will be referred to only as a controller and a server capable of providing a broadcast service.

In addition, the configuration of FIG. 2 is a case where the HRPD system is configured. Accordingly, the same configuration may be used in a system called 1x EV-DV capable of providing a service similar to an HRPD system. In addition, in the case of the CDMA2000 1x system, the base stations 211, 212, 213, and 214 are replaced by a base station transceiver (BTS) that transmits and receives a well-known radio signal, and the base station controllers 221 and 222 are replaced by the base station transceiver. It is replaced by a base station controller (BSC) that controls the (BTS). When the base station controller (BSC) provides a packet data service or a broadcast service according to the present invention, the base station controller (BSC) is connected to the packet data service node 241 through the packet control function unit 231 to transmit and receive packet data. When providing a voice service, it may be connected to a mobile communication switching system (MSC) or a switching agent system (MSCe) and a media gateway (MGW), which are not shown in FIG. 2. Therefore, in the following description, it is noted that the contents are applicable to all systems in the same manner, unless it is specifically divided into a CDMA2000 1x system and an HRPD system.

The group of broadcast services as shown in FIG. 2 may be determined in units of base station controllers 221 and 222 or in units of a packet control function unit 231. Therefore, if the broadcast group 1 (100) and the broadcast group 2 (110) described in the prior art are determined in units of the base station controller, the base stations (211, 212) connected to the lower portion of the first base station controller 221 is a single broadcast service A broadcast group may be provided, and base stations 213 and 214 connected below the second base station controller 222 may form another broadcast service group. In addition, when the packet control function unit 231 is configured, the first base station international controller 221 and the base stations 211 and 212 connected to the lower base station, the second base station international controller 222 and the base stations 213 and 214 connected to the lower base station are connected. One broadcast group is formed.

Therefore, in the present invention, the above-described network operations are operations performed at the base station controller or at the packet control function. In the following description, it is assumed that the network operation is performed by the packet control function for convenience of understanding.

FIG. 3 is a diagram for describing providing a broadcast service from base stations according to a location of a mobile terminal rather than a group of broadcast services according to the present invention. Referring to FIG. 3, the first group 100 and the second group 110, which are grouped in a base station controller unit or a packet control function unit as shown in the related art, are illustrated. In the following description, it is assumed that such a group unit is grouped by a base station controller unit. Referring to the base stations of the first group 100 and the second group 110 in the prior art, even if the base station (301, 302, 303) that can not transmit the broadcast service data to the mobile terminal, the broadcast service data to the mobile terminal 330 The same broadcast service as the base station 304, 305, 306 that can transmit has to be provided to the mobile terminal 330. However, in the present invention, the base stations 304, 305, which can communicate with the mobile terminal 330, which receives the broadcast service, among the base stations 301, 302, 303, 304, 305, and 306 included in the first group 100, 306 only transmits broadcast service data. The other base stations 301, 302, and 303 do not provide a broadcast service.

In addition, if the mobile station 330 can receive a broadcast service from a specific base station of the base station (311, 312, 313, 314, 315, 316) of the second group 110 of another group by the base station controller Broadcasting service can be provided without grouping. That is, the mobile terminal 330 may receive a broadcast service from the base station 312 of the second group 110 and the base stations 304, 305, and 306 of the first group. This is also the case for the other mobile terminal 340. In the case of the mobile terminal 350 located only in one base station controller, the mobile station 340 receives the broadcast service from the base stations 314, 315, and 316 that can receive the service. Can be.

<Network operation>

Let's first look at the operation of the network. In the following description, the operation of the network may be the operation of the packet control function unit 231 or the operation of the base station controllers 221 and 222 as described above with reference to FIG. 2. In addition, each operation may be divided into an operation performed by the packet control function unit 231 and an operation performed by the base station controller 221. Next, the operation of the network will be divided into four types. Firstly, activation of broadcast traffic transmission will be described, secondly, deactivation of broadcast traffic transmission will be described, and thirdly, a base station of a network to provide broadcast service must be provided. Overhead will be described, and finally, a control process performed from the network perspective will be described.

[1] activation of broadcast traffic transmission

In the network or the base station, the mobile station activates transmission of the corresponding broadcast traffic for a cell or a sector for transmitting a BMCCS registration message. In addition, it is determined whether to provide a broadcast service in an adjacent neighboring cell or sector based on the reception strength of a pilot signal transmitted together with a broadcast service registration message transmitted by the mobile terminal. For example, the reception strength of the pilot signal received from the mobile terminal is greater than or equal to a predetermined value (eg T_ADD), and soft combining with the broadcast traffic transmitting the broadcast traffic of the corresponding cell or sector in the cell where the terminal is located. If possible, the network or the base station performs broadcast traffic transmission in the corresponding cell.

This will be described below with reference to FIG. 3. As illustrated in FIG. 3, the mobile terminal 330 may receive a broadcast service from adjacent base stations 304, 305, 306, and 312 and flexibly combine with the broadcast service to provide a high quality broadcast service. In order to support this, if the mobile station located in the base station 304 can provide the broadcast service by the information reported from the mobile terminal 330 even if no mobile terminal receives the broadcast service, In order to provide a broadcast service, broadcast traffic is activated. Of course, if the base station 304 is already transmitting the corresponding broadcast traffic, the network does not perform a separate activation procedure for the base station 304.

[2] deactivation of broadcast traffic transmission

In the same manner as described in the above activation, the base station performs an activation process for transmitting broadcast traffic and provides a broadcast service. On the other hand, when the mobile stations do not transmit a BMCCS registration message for a predetermined time, for example, a maximum transmission period, the broadcast service is stopped when the following conditions are met.

First, there should be no broadcast service registration for a particular cell or a specific base station. Secondly, reception of a pilot signal of a specific cell or a specific base station reported from a mobile terminal included in an adjacent cell or a base station of the specific cell or a specific base station during a period in which the broadcast service registration does not exist in the specific cell or a specific base station. It should be the case that the intensity is smaller than the predetermined threshold. This means that no terminal receives broadcast traffic from the specific cell or base station and does not perform soft combining using the same.

Even if the above conditions are met, the network transmits broadcast traffic through the base station for a predetermined period of time, for example, a minimum period of transmitting broadcast traffic. The network checks whether broadcast service registration is performed during the minimum period as a third condition. In order to check the third condition, the present invention transmits a broadcast overhead message including information on the specific cell or a specific base station and inserts a field for requesting broadcast service registration in both the specific cell and the adjacent cell. . The message field used here is considered in more detail in the overhead transmitted from the base station described below. Then, even when the BMCS registration message is not received even during the predetermined time, or the reception strength of the pilot signal reported from the mobile terminal receiving the broadcast traffic of the neighboring cell is smaller than the predetermined threshold value. If so, the network stops the broadcast traffic broadcast on the specific cell or base station. The third condition is additional. Therefore, the first and second conditions may be configured to interrupt broadcast traffic only.

[3] Overhead transmitted from base station

Then, the overheads proposed to date among the broadcasting overheads to be provided in the system for providing the current broadcasting service BCMCS will be examined first. In addition, the following briefly examines the registration period of the broadcast service and the overhead message for broadcasting among the proposed overheads.

As described above, the broadcast service registration message is transmitted according to a preset cycle, and there may be two cycles. Each broadcast overhead message includes an indicator indicating a request for transmitting a BCMCS registration message at a corresponding period. The following two indicators exist.

(1) Registration Required Indicator for Paging; When the field is set to '1', the mobile station transmits a BMCCS registration message for each period of a registration period for paging previously received from the base station.

(2) Registration Required Indicator for Dynamic Broadcast (Registration Required Indicator for Dynamic Broadcast): When the field is set to '1', the mobile station registers a registration period for dynamic broadcast previously received from the base station. A BMCCS registration message is transmitted at each broadcast cycle.

In general, the period of the Registration Period for Paging is larger than the period of the Registration Period for Dynamic Broadcast. However, the period of the registration period for paging is not necessarily greater than the period of the registration period for dynamic broadcasting.

In case of transmitting a BCMCS Flow Registration message, the mobile terminal transmits the strength of the pilot signal received from the base station to the mobile terminal and information of the base station (eg pilot PN) received through the pilot signal. . The broadcast service registration message is a Radio Environment Report (RER) message used by a Rack (Link Access Control) layer in CDMA2000 1x, and a RouteUpdate message is used in CDMA2000 HRPD. In addition, the broadcast service registration message has a field for indicating a base station capable of soft combining. However, in the related art, since flexible coupling is possible only from base stations in the same broadcast group, it is ignored when information on base stations in another broadcast group is received.

In addition to the above fields, the Broadcast Overhead Message transmitted by the base station basically includes the BMCS Flow Identifier, Broadcast Physical Channel information, data rate, and frame size. It includes information such as (frame size). In addition, the base station transmits the information of the cell or sector transmitting the message and the information used for the broadcast service (BCMCS) in the neighboring cell or sector.

A broadcast overhead message according to the present invention should include the following information for each broadcast service (BCMCS Flow) for each cell or sector.

(1) Information on whether the broadcast service (BCMCS Flow) is activated and deactivated (Active / Inactive): When the information indicates active, the corresponding cell is transmitting the corresponding broadcast service traffic. Therefore, the mobile terminal does not transmit a broadcast service registration (BCMCS Registration) message, it shows a state that can listen to the broadcast service. If it is marked as Inactive, the above is the opposite.

(2) Information for indicating whether or not soft combining of a corresponding broadcast service is possible. The above information is information indicating whether a corresponding broadcast service can be soft combined or not. According to the prior art, it is possible to softly combine broadcast services in units of broadcast groups. That is, as described in the related art, when different broadcast service groups are provided, even when the same service is received, even if the pilot signal is well received, the broadcast service cannot be used in a flexible combination. In the present invention, broadcast groups are not divided into base station controllers or packet control function units as in the prior art. However, a case where flexible coupling is impossible for the same broadcast service may occur. This may be the case, for example, when packet data service nodes are different. In general, if the packet data service nodes are different, the two signals cannot be combined in any case. Therefore, if this is the case, it may be a case where flexible coupling is impossible for the same broadcast service. However, the above-mentioned cases do not generally occur and thus can be ignored.

(3) Registration Required Indicator for Dynamic Broadcast (Registration Required Indicator for Dynamic Broadcast) information: The registration request indicator for dynamic broadcast is a value transmitted when a broadcast service is to be released according to the present invention. The above information was a value also used in the prior art. In contrast with the prior art and the present invention will be described as follows.

The information according to the prior art is composed of one field. Accordingly, when the field is set to '1', the field is used to transmit a BMCCS registration message within a period set as a broadcast period for dynamic broadcasting to the mobile terminal. In the related art, only one field is needed because all the base stations of all broadcast groups including the corresponding base station as one broadcast service registration message provide the same broadcast service.

However, the present invention does not distinguish broadcast groups. Therefore, since the message needs to be performed for both the cell or base station to stop broadcasting service and adjacent cells or base stations of the cell or base station, the message must further include as many fields as the number of adjacent cells or base stations.

FIG. 4A is a diagram illustrating a field in which a field is modified or added to a conventional broadcast overhead message used in an HRPD BCMCS system as an example of a broadcast overhead message used for the present invention. FIG. Another embodiment of a broadcast overhead message used for the present invention is a view showing a portion in which a field is modified or added to a conventional broadcast overhead message (BroadcastOverhead Message) used in the HRPD BCMCS system, Figure 5 is for the present invention Another example of a broadcast overhead message used is a portion in which a field is modified or added in a conventional broadcast system parameter message (BSPM) used in a CDMA2000 1x BCMCS system.

In FIG. 4A and FIG. 4B, the MessageID field indicates a type of message and is composed of 8 bits. The Sectorsignature field is a field indicating a sector and consists of 16 bits. The above fields are general fields of the overhead message used in the HRPD BCMCS system. Fields not related to the present invention included below are omitted. In addition, the meaning of "BCMCSFlowCount occurrences of the following variable-length record" means that the number of broadcasts to be serviced is repeated, and the value of the "BCMCSFlowID" field means the ID of a broadcast service. The "RegisterForPaging" field is a value indicating registration for each registration period for paging. If the value is "1", the "RegisterForPaging" field is a value that requires registration to the mobile terminal. In addition, the "RegisterForDynamicBroadcast" field is a value set for requesting aperiodic registration to the mobile terminal for each dynamic period for blocking the broadcast service. The above values have described values that are commonly used and are the fields described to aid in understanding the present invention.

Then look at the fields according to the invention. The “Zero or NeighborCount occurrences of the following field” field of FIG. 4 refers to a value for repeating the number of adjacent cells or base stations of the corresponding cell or base station. Through this, it is possible to provide a broadcast service without dividing a base station into broadcast groups according to the present invention. That is, the "SoftCombineStatus" field is a 2-bit value indicating whether soft coupling is possible or not and whether current broadcast traffic is provided. If the values of the "SoftCombineStatus" field are defined, they are configured as shown in Table 1 below.

Field value meaning 00  Soft Combining Disable, BCMCS Off or Unknown 01  Soft Combining Disable, BCMCS On 10  Soft Combining Enable, BCMCS Off 11  Soft Combining Enable, BCMCS On

In addition, the "RegisterForDynamicBroadcast" field is a field for requesting a broadcast service registration within a dynamic broadcast service period by a specific cell or a specific base station to confirm broadcast blocking according to the present invention. Therefore, the field is included only when the "SoftCombineStatus" field is '11'. By using the above fields, a specific cell or base station can smoothly provide a broadcast service without distinguishing a broadcast group.

The "Zero or NeighborCount occurrences of the following field" field of FIG. 4B means a value for repeating the number of adjacent cells or base stations of the corresponding cell or base station. Through this, it is possible to provide a broadcast service without dividing a base station into broadcast groups according to the present invention. That is, the "SoftCombineStatus" field is a 2-bit value indicating whether soft coupling is possible or not and whether current broadcast traffic is provided. If the values of the "SoftCombineStatus" field are defined, they are configured as shown in Table 2 below.

Field value meaning 00  Soft Combining Disable, BCMCS Off or Unknown 01  Soft Combining Enable, BCMCS Off 10  Soft Combining Enable, BCMCS On, and Dynamic Registration for Paging is required 11  Soft Combining Enable, BCMCS On

When the field value is '10' in Table 2, the same effect as when the value of the "SoftCombineStatus" field is '11' and the "RegisterForDynamicBroadcast" field is set to '1' in the embodiment illustrated in FIG. 4A. Indicates.

5 shows a configuration of a BSPM for the present invention in CDMA2000 1x BCMCS. 5, the "PILOT_PN" field and "CONFIG_MSG_SEQ" are basic message formats initially added to a broadcast service parameter message. The fields shown below are not highly related to the present invention and will not be described.

The meaning of "NUM_BCMCS_SESSION occurrences of the following variable length record:" according to the present invention means that the information included below is repeated by the number according to the type of broadcast service. For example, if three broadcast services such as KBS, MBC, and SBS are provided, the following fields indicated above are repeated three times, and each field has different values according to each broadcast service. The "BCMCS_FLOW_ID_LEN_IND" is a value for indicating how many bits are included in the field below since the "BCMCS_FLOW_ID" field located immediately below has 16 bits, 24 bits or 32 bits. The "BCMCS_FLOW_ID" field is a field value for notifying the type of broadcast service, and the "BCMCS_ON_OFF_IND" field is a field for notifying whether broadcast service is provided. In addition, information of the "BCMCS_FLOW_ID_LEN_IND" field and the "BCMCS_FLOW_ID" field is transmitted through another message not shown in FIGS. 4A and 4B in the HRPD system.

Next, the "BCMCS_REG_USED" field is a value indicating whether or not to broadcast service registration (BCMCS Registration), when the broadcast service registration should be defined by the value defined in the "BCMCS_REG_TIMER" field to determine the frequency of transmitting a broadcast service registration message. do. The two fields shown below the fields are fields newly added according to the present invention. The "BCMCS_REG_REQUIRED_FOR_DYNAMIC_BROADCAST" field is a field for notifying whether broadcast service should be dynamically registered. If the broadcast service does not need to be dynamically registered, the field is not added. In addition, when a broadcast service needs to be dynamically registered, a "BCMCS_REG_TIMER_FOR_DYNAMIC_BROADCAST" field is further added to indicate a period for dynamically registering a broadcast service.

In addition, it must be provided with "NUM_NGHBR" to inform the number of the adjacent base station or cells of the cell or base station. As described above, the values included below vary according to the number of adjacent base stations or cells. That is, "NUM_NGHBR occurrences of the following variable length record" means a number of times of repeating according to the number of neighboring base stations or cells. For example, if there are five base stations adjacent to a particular base station, the fields indicated below in the "NUM_NGHBR occurrences of the following variable length record" are repeated five times, and the values of each field are changed to different values to inform the base station or cell information. Have.

The "NGHBR_RECORD_LEN" field additionally included according to neighboring base stations indicates the length of fields included to inform information of neighboring base stations or cells included below, and "NGHBR_PN" indicates a corresponding base station or cell among neighboring base stations or cells. This value indicates the PN to be sent by. In addition, "NGHBR_BCMCS_CONFIG" is a value for informing configuration information about this broadcast service, and is changed and used in the present invention as shown in Table 3 below.

Value (binary) Neighbor BCMCS Configuration 000  The neighbor base station configuration with respect to this BCMCS session is not known or the neighbor base station is not configured to transmit this BCMCS session. 001  The neighbor base station is transmitting this BCMCS session. Autonomous soft-handoff of the F-BSCH carrying this BCMCS session is not possible with this neighbor base station. 010  The neighbor base station is transmitting this BCMCS session. Autonomous soft-handoff of the F-BSCH carrying this BCMCS session is possible with this neighbor base station. 011  The neighbor base station is not currently transmitting this BCMCS session. Autonomous soft-handoff of the F-BSCH carrying this BCMCS session is possible with this neighbor base station. 100-111  Reserved.

In Table 3, the part which varies according to the present invention is a part whose value is 011. The above values were previously unused (Reserved), but are additional values in accordance with the present invention. When the value of the "NGHBR_BCMCS_CONFIG" field is set to "011", a value added to start a broadcast service of a corresponding base station by transmitting a broadcast service registration message if the size of the pilot received by the UE is greater than or equal to a predetermined value (eg T_ADD). to be. In addition, in FIG. 5, the lower two fields are included only when the value of the "NGHBR_BCMCS_CONFIG" field is set to "010". The lower two fields of the "NGHBR_BCMCS_CONFIG" field are fields added according to the present invention. The "BCMCS_REG_REQUIRED_FOR_DYNAMIC_BROADCAST" field in the added field is a field for indicating whether to dynamically register a broadcast service. Therefore, if the broadcast service registration is not requested dynamically, this field is not required. If the value is '1', the broadcast service registration message is transmitted when the periodic timer value becomes a periodic point in time of the timer field value, that is, a time point that is an integer multiple of the timer field value. In addition, when the field is added, a "BCMCS_REG_TIMER_FOR_DYNAMIC_BROADCAST" field may be added and a period value for dynamically registering a broadcast service may be informed using the field.

[4] control process performed from the network perspective

The control process performed from the network point of view is an operation performed by the base station controller or the packet control function unit. In the following description, it is assumed that it is performed in the base station controller for convenience of description. However, the control of the operation to be described later may be configured to be performed by the packet control function unit, or may be configured to be performed by dividing part of the operation to be described later by the packet control function unit and the base station controller.

6 is a control flowchart of a network for providing a broadcast service according to an exemplary embodiment of the present invention. Hereinafter, it is assumed that the control flow process of FIG. 6 is performed in the base station controller.

The base station controller maintains a broadcast service control state in step 600. The broadcast service control state refers to a state of providing broadcast traffic received from the broadcast server 270 to a corresponding mobile terminal through base stations. In addition, in the present invention, since there is no group classification for the broadcast service, the base station controller is a process of individually controlling each base station. In step 602, the base station controller checks whether a time point at which an overhead message should be transmitted to all of the base stations or a specific base station arrives. In this case, it is assumed that the transmission time of the overhead message is transmitted every predetermined time. However, you can actually configure it to always send overhead messages. In this case, step 602 may be replaced as a process of checking a time when the content of the overhead message should be changed. If the time point at which the overhead message should be transmitted is reached or the time point at which the overhead message needs to be changed has arrived, the process proceeds to step 604 in which all base stations under the control of the base station or the base station controller are present. Generate an overhead message to be transmitted, and control to transmit the generated overhead message.

On the other hand, if the check result of step 602 is not the time of transmission of the overhead message, the base station controller proceeds to step 606 to check whether there is a need to transmit broadcast traffic from a specific base station. As such, when broadcast traffic is to be transmitted from a specific base station, when broadcast traffic that is not being serviced is requested from a specific terminal of the base station or broadcast service received by a mobile terminal included in an adjacent base station of the specific base station This may be the case where a particular base station needs to provide it. In the second case, as a process according to the present invention, the broadcast service is not provided separately for each broadcast group, and the base stations are individually controlled according to the position of the mobile terminal. That is, even when the mobile terminal exists outside the specific base station, the strength of the pilot signal received from the base station is greater than or equal to a predetermined value. In this case, when the same broadcast service is provided by a base station other than the base station including the mobile terminal, the mobile terminal can flexibly combine the received broadcast service.

Therefore, if it is necessary to provide a broadcast service to a specific base station as a result of step 606, the base station controller proceeds to step 608 to provide a broadcast service to the corresponding base station. In this case, when the first broadcast service needs to be provided, a control process for receiving data through a broadcast server should be further performed. However, since this process is a general process of providing a broadcast service, it will not be described herein any further.

On the other hand, if there is no need to provide a broadcast service to a specific base station as a result of the check in step 606, the mobile terminal proceeds to step 610 to check whether it is necessary to release the broadcast service of a specific base station. In this case, when there is a need to release the broadcast service, the registration message for the broadcast service is not continuously received for a preset time, and the pilot signal of the corresponding base station reported from the adjacent base station of the corresponding base station provides all the broadcast services. If the measured results in the receiving mobile terminals do not need to perform a soft coupling, that is, the received pilot size is all less than a certain size (eg T_ADD). In this case, the base station controller proceeds to step 612 to generate an overhead message for broadcast release and control the base station controller to transmit the corresponding base station and adjacent base stations of the base station. In this case, the transmitted message may be a message of a format as shown in FIG. 4A, 4B, or 5, and a message field thereof is configured as described above.

Thereafter, the base station controller proceeds to step 614 to check whether the time specified in the overhead has elapsed. If the set period of time elapses, the base station controller proceeds to step 620 to control to release the corresponding broadcast service provided by the corresponding base station.

However, if the preset time has not elapsed in step 614, the process proceeds to step 616 and determines whether a broadcast registration message is received from the predetermined mobile terminal. When the broadcast registration message is received as a result of the check, the process proceeds to step 618 to maintain the broadcast service of the base station. Through this process, each base station can provide a broadcast service according to the location of the mobile terminal.

<Operation of Mobile Terminal>

Next, the operation of the mobile terminal will be described in detail. The operation of the mobile terminal according to the present invention described below will be largely divided into three parts. First, a registration message transmission of a mobile terminal will be described. Second, a soft coupling at the terminal will be described. Third, a control process performed at the mobile terminal according to the present invention will be described.

[1] Registration message transmission of mobile terminal

In a system providing a broadcast service, a BMCS registration message is periodically transmitted from a mobile terminal for time unit charging of the mobile terminal. Accordingly, the mobile terminal transmits a broadcast service registration message to the base station at predetermined intervals. In addition, according to the present invention, the mobile station transmits a broadcast service registration message to the base station aperiodically. In addition, the broadcast service registration message should always be transmitted together with the reception size of the pilot signal of the neighboring cell when the message is transmitted.

The mobile terminal according to the present invention monitors information of neighbor cells or sectors included in a broadcast overhead message transmitted by a base station to transmit a BMCS message aperiodically. Then, the reception strength of the pilot signal of the neighboring cell or sector received by the mobile terminal is monitored. In addition, the mobile terminal according to the present invention can efficiently receive the broadcast service by transmitting the result of the monitoring to the network.

Next, specific fields of the overhead received from the base station and the operation performed in the mobile terminal according to the value thereof will be described.

(1) Information on whether the broadcast service (BCMCS Flow) is activated and deactivated (Active / Inactive): When the information indicates active, the corresponding cell is transmitting the corresponding broadcast service traffic. Therefore, the mobile terminal does not transmit a broadcast service registration (BCMCS Registration) message, it shows a state that can listen to the broadcast service. If it is marked as Inactive, the above is the opposite.

(2) Information for informing whether or not soft combining is possible for the corresponding broadcast service. The matters to be aware of before the meaning of the message is that the mobile station broadcasts only one base station as shown in FIG. 3. The broadcast service can be provided from various base stations without receiving the service. Therefore, when a mobile service is provided with a broadcast service from a base station and neighboring base stations, it is checked whether a cell or sector of the base station is providing a broadcast service and whether or not a soft coupling is possible. Will be performed.

If the cell is inactive with respect to a broadcast service or if soft combining is possible by receiving broadcast traffic received from the cell, the terminal may receive a predetermined preset power of a pilot signal transmitted from the cell. If the value is greater than the value, the BMCS Registration message is transmitted.

(3) Registration Required Indicator for Dynamic Broadcast field: The field is a conventionally proposed scheme as described in terms of network. When the field is set to '1', the BMCS registration message is transmitted in a broadcast cycle for dynamic broadcast. Conventionally, only one field is included in the broadcast overhead message. However, in the present invention, a separate field exists for neighboring cells. Therefore, the mobile terminal generates and transmits a broadcast registration message within the period when the message is included in the information of neighboring cells and the reception is possible with a pilot strength of more than a preset value.

In addition, according to the present invention, when a mobile terminal satisfies the following conditions according to information included in a broadcast overhead message and reception strength information of a pilot signal of a neighboring cell or sector received by the mobile terminal, the mobile terminal receives a broadcast registration (BCMCS registration) message. Send it.

(A) Soft handoff is possible in the broadcast overhead message, but broadcast traffic that the user is listening to is not being transmitted,

(B) The broadcast registration message is transmitted to neighboring cells or sectors in which the strength of the pilot signal received by the mobile terminal is greater than or equal to a predetermined value (e.g. T_ADD).

In addition, if the following conditions are satisfied in addition to the cases (A) and (B) described above, a BCMCS registration message is transmitted at a corresponding time point.

(C) Soft handoff is possible in a broadcast overhead message, and for a neighboring cell (or sector) to which broadcast traffic that the user is listening is being transmitted,

(D) Request registration for dynamic broadcasting, and transmit a broadcast registration message when the reception strength of the pilot signal received by the mobile terminal is equal to or greater than a predetermined value (e.g. T_ADD).

[2] soft combining of mobile terminals

The process of flexibly combining the broadcast traffic transmitted from the cell where the mobile terminal is located and the neighbor cell is the same as in the related art. The mobile terminal softly combines only the traffic transmitted from a cell capable of soft coupling with the broadcast traffic transmitted from the cell in which the terminal is currently located among the cells transmitting the user's desired broadcast traffic. That is, soft combining is possible in a broadcast overhead message, and softly combines traffic of a cell transmitting the corresponding broadcast.

[3] control process performed in the mobile terminal

Next, a control process performed by the mobile terminal to receive the broadcast service according to the present invention described above will be described.

7 is a control flowchart of BCC registration in a mobile terminal according to a preferred embodiment of the present invention. Hereinafter, a control flow for providing a broadcast registration message in a mobile terminal according to the present invention will be described in detail with reference to FIG. 7.

When the mobile terminal starts the broadcast service, as described above, the mobile station periodically transmits a registration message to the base station. To this end, a timer for determining a transmission time of a registration message is operated. This process represents step 700 of FIG. That is, it is in a state of waiting for a registration message transmission time by the timer value. Thereafter, the base station checks whether the timer value becomes the N multiple (N = 1, 2, ...) of the period for paging in step 702. The value of the period value for paging and the period for dynamic broadcast may be transmitted from the network to the mobile terminal at the start of the broadcast, or may be transmitted in a broadcast overhead message.

If it is the broadcast registration time for paging (BCMCS registration) in step 702, the process proceeds to step 704 to check whether broadcast registration for paging (BCMCS registration) is required. In this case, the value used for the inspection may be inspected as a field value of "IndicatorForPaging" described in the network operation, and the field is based on the value included in the previously received broadcast overhead message. If broadcast registration is requested in step 704, the process proceeds to step 706, otherwise, the process proceeds to step 708.

In step 704 to step 706, the mobile terminal transmits a broadcast registration message including the broadcast channel information being received by the user, and also transmits the reception strength information of the pilot signal of the neighboring cell. In step 708, it is checked whether the timer value should be reset. The reset of the timer occurs whenever a value becomes larger between a registration period value for paging and a registration period value for dynamic broadcast. If the timer value is to be reset in step 708, the timer goes to step 710 to reset the timer. However, if the timer does not need to be reset, step 710 is not performed.

On the other hand, if the check result timer value of step 702 is not the time point N times (N = 1, 2, ...) of the paging period (Period For Paging) for registration, the mobile terminal proceeds to step 712. If the mobile terminal proceeds to step 712, it checks whether it is a registration cycle time point for dynamic broadcast. If it is the registration time point for the dynamic broadcast as a result of the check in step 712, step 714 is performed.

In step 714, the mobile terminal checks whether a registration instruction for dynamic broadcasting included in the previously received broadcast overhead message is received. At this time, it is checked whether the mobile terminal instructs registration for dynamic broadcasting among neighboring cells as well as the current cell or sector for transmitting the BMCCS registration message. If any of the checks in step 714 indicates a registration for dynamic broadcast, the flow proceeds to step 716 to check whether the cell requesting the dynamic broadcast is the current cell. In step 716, if the current cell requests the cell, the process proceeds to step 718 and immediately transmits a BMCCS registration message including the broadcast channel information being received by the user. Thereafter, the flow proceeds to step 708 described above to perform the following operations. However, in step 716, if the cell for which the dynamic broadcast is requested is not the current cell, step 722 is performed. Step 722 will be described again below.

On the other hand, if the test result of step 712 is not the registration period for the dynamic broadcast, the mobile terminal proceeds to step 720. In step 720, the mobile terminal checks whether there are cells or sectors among neighboring cells or sectors that do not transmit broadcast traffic that the user is listening to. That is, in step 720, the pilot signal is received from the mobile terminal's point of view, and it is checked whether there is a cell or sector that does not provide a broadcast service in the corresponding cell or sector. When the pilot signal is received in step 720 and there is a cell or sector that does not provide a broadcast service in the corresponding cell or sector, a predetermined value (eg T_ADD) of a pilot signal received from the cell or sector is predetermined. Check for abnormalities. The test result of step 722 checks whether the strength of the pilot signal received from the cell or sector is greater than or equal to a predetermined value.

If the pilot signal is greater than or equal to a predetermined value as a result of the check in step 722, the mobile station transmits a link to broadcast traffic transmitted from a cell or sector currently receiving a broadcast service by a cell or sector having a pilot signal greater than or equal to the predetermined value. Check if soft combining is possible. If a soft coupling is possible as a result of the test of step 724, step 726 is performed. Otherwise, step 708 is performed. In step 726, the mobile terminal generates and transmits a BMCCS registration message. At this time, the strength of the pilot signal and whether or not the soft coupling is possible are performed as described above for all corresponding neighboring cells. In step 708, the timer is checked for reset.

<Other embodiments>

Next, the method and other embodiments described above will be described. 8 is a diagram illustrating an embodiment of a broadcast overhead message for broadcasting according to another embodiment of the present invention. The broadcast overhead message shown in FIG. 8 illustrates a broadcast overhead message used in the HRPD BCMCS system and a portion added according to the present invention by hatching.

Two fields added in the embodiment of FIG. 8 are a pilot registration report included (RegisterForPilotReportIncluded) field and a pilot registration report (RegisterForPilotReport) field. Among them, the "RegisterForPilotReportIncluded" field serves to inform that the "RegisterForPilotReport" field information for each adjacent sector is added to the broadcast overhead message. Therefore, the "RegisterForPilotReport" field is included in the broadcast overhead message as many as the value of the "NeighborCount" field only when the "RegisterForPilotReportIncluded" field is set to '1'. Therefore, the mobile station measures the pilot strength of neighbor base stations or sectors when the value of the "RegisterForPilotReportIncluded" field included in the broadcast overhead message is set to '1'. When the measured pilot strength of the base stations or sectors is larger than the SoftHandoffPilotAdd value, the broadcast registration message should be transmitted to the base station or sector corresponding to the active set.

The same operation as in the above-described embodiment may be performed by combining the value of the "RegisterForPilotReport" field with a softcombine field, which is a currently provided field.

One of the fields used in the present invention, the field "SoftCombine" represents whether the corresponding BCMCS flow is being transmitted in the adjacent sector (BCMCS on / off). Therefore, there are four possible combinations of 1 bit of "SoftCombine" and 1 bit of the "RegisterForPilotReport" field, which is an added field according to the present invention, which is shown in Table 4 below. That is, each of the four cases shown in Table 4 corresponds to the four cases of the salping soft coupling state (SoftCombineStatus).

SoftCombine field RegisterForPilot Report field Meaning 0 0  Soft combining is disabled, and Power based registration is not needed (equivalent to SoftCombineStatus '00') 0 One  Soft combining is disabled, but Power based registration is needed (equivalent to SoftCombineStatus '01') One 0  Soft combining is enabled, and Power based registration is not needed (equivalent to SoftCombineStatus '11') One One  Soft combining is enabled, but Power based registration is needed (equivalent to SoftCombineStatus '10')

The format transmitted in this way is shown in FIG. FIG. 10 is a diagram illustrating a part added to a conventional broadcast overhead message used in an HRPD BCMCS system as another embodiment of a broadcast overhead message used for the present invention. 10 illustrates a field in which hatched portions are added as another embodiment of the present invention. In addition, the fields used in the present invention among the fields of FIG. 10 are the two fields of the SoftCombine field and the PilotForPilotReport field. The remaining fields show the fields included in the overhead message of the broadcast service.

In the case of FIG. 10, unlike the previous embodiment, the "RegisterForPilotReport" field may be transmitted by including the number of adjacent sectors of the base station for each broadcast identifier. That is, the embodiment is a method of including a "RegisterForPilotReport" field for each sector adjacent to the broadcast identifier. Therefore, there is a disadvantage in that an overhead message of a larger size is required than the above-described embodiment. However, there is an advantage that it is possible to turn the broadcast on and off (ON / OFF) for each broadcast identifier. That is, the base station may be configured to not be provided or not provided for each specific broadcast service. This can increase the efficiency of the radio resources, there is an advantage that can reduce the interference due to not providing a broadcast service. This "RegisterForPilotReport" bit is included in the broadcast overhead message only when the "RegisterForPilotReportIncluded" bit is set to 1.

Also in the second embodiment, when the "RegisterForPilotReport" bit is set to '1' and the pilot strength of the corresponding sector is larger than the value of "SoftHandoffPilotAdd", the mobile station has a base station corresponding to an active set. Should be sent.

In the case of using the above-described method, the base station may generate and transmit a broadcast overhead message of the format of FIG. 8 or the format of FIG. 10 that is determined to be used. Since the transmission method of the broadcast overhead message can be transmitted in the manner described above, it will not be reviewed again.

Meanwhile, in the mobile terminal, the process controlled when receiving the message of FIG. 8 or 10 is different. Therefore, this will be described with reference to FIG. 9. 9 is a control flowchart performed in a mobile terminal receiving an overhead message as in the embodiment of FIG. 8 or 10 of the present invention.

As described in the foregoing embodiment, when the mobile terminal starts to receive the broadcast service, the mobile station periodically transmits a registration message to the base station. To this end, when the broadcast service is started, the mobile terminal operates a registration timer for determining a transmission time of a registration message. The registration timer is incremented by the time corresponding to the slot every slot. 9 illustrates a control process performed in a state where a broadcast service is provided.

In step 900, the mobile terminal is provided with a broadcast service. In step 902, the mobile terminal receives the broadcast service and checks whether the mobile terminal is set to perform registration for paging. The setting for performing registration for paging is determined through a session negotiation process when the mobile terminal and the base station establish a session. If the registration for paging check result of step 902 is set, the mobile terminal proceeds to step 904, and if not, proceeds to step 906. When the process proceeds from step 902 to step 904, that is, when paging for registration is set, the mobile station checks whether a registration timer is a paging period in the current slot. This check is performed by checking whether the value of the registration timer in the current slot corresponds to an integer multiple of a preset paging period. If the check result registration timer of step 904 is an integer multiple of the paging period, that is, the paging period, the process proceeds to step 914, and if it is not the paging period, the process proceeds to step 906.

In step 902 or step 904 to step 906, the mobile terminal determines whether dynamic broadcast registration (RegisterForDynamicBroadcast) is set. If the dynamic broadcast registration is set, the mobile terminal proceeds to step 908. Otherwise, the mobile terminal proceeds to step 910. In step 906, the mobile terminal checks whether a registration timer is a dynamic broadcast registration period in the current slot. If the check result registration timer of step 908 is a dynamic broadcast registration period, step 914 is reached; otherwise, step 910 is performed.

Meanwhile, in step 906 or step 908 to step 910, the mobile terminal checks whether neighbor pilot registration is set. The process of checking whether the neighbor pilot registration is set is performed by examining a broadcast overhead message recently received from an adjacent sector or a base station. In this case, if there is more than one broadcast overhead message received, the check should be performed for all overhead messages. In the embodiment of FIG. 9, only one overhead message will be described instead of checking each of the overhead messages.

In step 912, if there is a sector in which registration is registered for reporting a pilot for a broadcast service (BCMCS Flow ID) that the terminal intends to receive as a result of checking the received broadcast overhead message, the process proceeds to step 912. Proceed to step. In step 910 to step 912, the mobile station measures the pilot strength of the base station or sector providing the broadcast service that the terminal wants to receive. If the measured strength of the pilot is greater than the value of the "SoftHandoffPilotAdd" predetermined in the session establishment process, the process proceeds to step 914; otherwise, the process proceeds to step 900. That is, if there is no sector in which pilot registration is set or the sector whose pilot size is larger than the value of "SoftHandoffPilotAdd" among the sectors in which pilot registration is set, the registration process is not performed in the current slot.

In step 904 or 908 or 912, the mobile terminal generates a broadcast registration message and transmits the broadcast registration message to the base station. That is, the broadcast registration process is performed. The broadcast registration message is transmitted through an access channel. The broadcast registration message is generated as a message and transmitted to the base station by the mobile terminal. In addition, the broadcast registration message transmitted through an access channel is transmitted along with a route update message including pilot information of neighboring sectors. After completing the broadcast registration, the mobile terminal proceeds to step 916 to compare the paging period and the dynamic broadcast registration period in order to reset the set value of the timer. If the current timer is equal to the larger of the two values, the process proceeds to step 918; otherwise, the process proceeds to step 900. In step 918, the mobile terminal resets the timer, and then proceeds to step 900.

As described above, when a broadcast service is provided in a wireless communication system, there is an advantage of preventing resource waste of a network. In addition, there is an advantage that the broadcast service quality of the mobile terminal can be improved by providing a service mainly on the mobile terminal.

Claims (35)

delete delete delete delete delete delete delete delete delete In a mobile communication system providing a broadcast service, A serving base station for transmitting an overhead message and broadcast traffic including broadcast related information for at least one neighboring base station; A neighboring base station receiving the transmission of the broadcast traffic from the serving base station and transmitting the broadcast traffic; And a mobile terminal for receiving the broadcast traffic from the serving base station and the adjacent base station. The system for providing a broadcast service in a wireless communication system according to claim 10, wherein the mobile station measures a pilot received signal strength of an adjacent base station and reports it to a serving base station.  The system of claim 10, wherein the broadcast associated information includes information indicating whether a broadcast service is activated and information indicating whether softenable combining of the broadcast traffic is possible. The wireless terminal of claim 10, wherein the mobile station transmits a broadcast registration message to the serving base station requesting the neighbor base station to transmit the broadcast traffic when the neighbor base station is not transmitting the broadcast traffic. System for providing a broadcast service in a communication system. A method for receiving broadcast traffic from a mobile terminal of a communication system providing a broadcast service, Receiving an overhead message including broadcast related information on at least one neighboring base station when receiving broadcast traffic from a serving base station including the mobile terminal;  Determining a neighbor base station to receive broadcast traffic using the broadcast related information and the pilot received signal strength of the neighbor base station; And receiving broadcast traffic from the determined neighboring base station. 15. The method of claim 14, further comprising the step of soft combining the received broadcast traffic. 15. The method of claim 14, wherein the broadcast related information includes information indicating whether a broadcast service is activated and information indicating whether or not the broadcast traffic can be softly combined. 17. The method of claim 16, wherein the information indicating whether or not flexible combining of the broadcast traffic indicates that the soft coupling is possible, and if the strength of the pilot received signal is greater than or equal to a threshold, the corresponding base station is determined as the neighbor base station to receive the broadcast traffic; Method for providing a broadcast service in a wireless communication system, characterized in that. The broadcast registration message of claim 17, wherein when the information indicating whether the broadcast service is activated indicates that the broadcast service is inactivated, a broadcast registration message requesting the neighboring base station determined to transmit the broadcast traffic to transmit the broadcast traffic is provided. The method for providing a broadcast service in a wireless communication system, characterized in that it further comprises the step of transmitting to the serving base station. 15. The method of claim 14, further comprising periodically transmitting a broadcast registration message to the serving base station. 20. The method of claim 19, wherein the broadcast registration message includes information on the strength of a pilot received signal of at least one neighboring base station. A method of providing broadcast traffic by a base station of a communication system providing a broadcast service, Transmitting broadcast traffic to the mobile terminal when a specific broadcast service is requested; And transmitting an overhead message including broadcast related information for at least one neighboring base station. 22. The wireless communication system of claim 21, further comprising requesting transmission of the broadcast traffic to the neighboring base station when receiving a broadcast registration message requesting the neighboring base station to transmit the broadcast traffic. Method for providing a broadcast service in a network. 22. The method of claim 21, further comprising releasing broadcast traffic when there is no mobile terminal receiving the broadcast traffic. 24. The method of claim 23, wherein the release of broadcast traffic is performed for every broadcast traffic. 24. The method of claim 23, wherein when there is no mobile terminal receiving the broadcast traffic when the broadcast traffic is released, a broadcast registration message is not received for a predetermined time, and when the broadcast traffic request is not received from neighboring base stations. Method for providing a broadcast service in a wireless communication system characterized in that. 22. The method of claim 21, wherein the broadcast related information includes information indicating whether a broadcast service is activated and information indicating whether or not the broadcast traffic can be softly combined. 22. The method of claim 21, wherein the broadcast registration message received from the mobile terminal comprises a strength of a pilot received signal of at least one neighboring base station. 28. The method of claim 27, further comprising: requesting transmission of broadcast traffic by the neighboring base station when the strength of the pilot reception signal of the neighboring base station received from at least one mobile terminal is at least one threshold value. Method for providing a broadcast service in a wireless communication system, characterized in that. A system for providing a broadcast service according to a mobile terminal receiving a broadcast service and a location of the mobile terminal, It provides the strength information of the pilot signal received from the base station with the broadcast registration message transmitted to the base station at a predetermined period when the broadcast traffic is received, and the flexible combination of the base station and the neighboring base station including the mobile terminal is possible, A mobile terminal transmitting an aperiodic broadcast registration message when the pilot signal strength is greater than or equal to a predetermined threshold value; The base station and the neighbor base station information including the mobile terminal, which receives the broadcast traffic required when the broadcast registration message is received from the mobile terminal, receives the broadcast traffic from the broadcast server and provides the mobile terminal, and enables the soft combining of the neighbor base station information and the broadcast traffic. And a network for providing an overhead message to the mobile terminal including a periodic broadcast registration message request and an aperiodic broadcast registration message request. The method of claim 29, wherein the network, Base stations for transmitting the broadcast traffic requested from the mobile terminal to the mobile terminal through a broadcast channel, and transmitting the overhead message to the mobile terminal;  A base station controller for controlling broadcast traffic of the base stations and controlling to generate the overhead message and to transmit them through the base stations; A packet control function for controlling packet data transmission of the base station controllers; And a packet data service node connected to the packet control function and connected to a packet data network. delete The method of claim 29, wherein the network, Base stations for transmitting the broadcast traffic to the mobile terminal through a broadcast channel and transmitting the overhead message to the mobile terminal;  A base station controller for controlling the base station and controlling a message received from an upper layer transmitted through the base station; A packet control function which performs control of packet data transmission of the base station controllers and controls the base station controllers to transmit the overhead message; And a packet data service node connected to the packet control function and connected to a packet data network. delete A method for receiving broadcast traffic from a mobile server and receiving broadcast traffic from a broadcast server to a mobile terminal and providing an overhead message to the mobile terminal, the method comprising: Checking reception strength of a pilot signal received from the neighboring base station according to whether the base station including the mobile terminal included in the overhead message and the neighboring base station are softly coupled when the broadcast traffic is received; And transmitting a reception strength of the pilot signal together with a broadcast registration message at each period indicated in the received overhead message. 35. The method of claim 34, wherein the overhead message includes a base station and neighbor base station information including a mobile terminal capable of soft coupling of neighbor base station information and the broadcast traffic, and a periodic broadcast registration message request or aperiodic broadcast registration message request. Method for providing a broadcast service in a wireless communication system, characterized in that.

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