KR20010026096A - Method for cell broadcasting service in mobile communication system - Google Patents

Abstract

PURPOSE: A method for supplying a CBS(Cell Broadcasting Service) in a mobile communication system is provided to simultaneously deliver broadcasting messages to mobile terminals of regular areas or mobile terminals of specific groups, by using a paging channel of CDMA(Code Division Multiple Access) wireless channels, so as to supply the CBS. CONSTITUTION: If a CBS(Cell Broadcasting Service) center(40) requests a broadcast to a TCAP(Transaction Capabilities Application Part)(54) of an exchange(50), the TCAP(54) invokes a TC(Transmission Convergence) to an MHI(Map Handling Interface)(53). The invoked MHI(53) decodes a delivered broadcasting request message to transmit the message to an MHC(Mobile Handling Controller)(52). The MHC(52) decodes the message according to a base station form, and transmits the decoded message to an MSA(Mobile Signaling Access) block(51). The MSA(51) transmits the decoded message to a BSC(Base Station Controller)(60). The BSC(60) transmits the decoded message to a BTS(Base Transceiver Station)(70). The BTS(70) transmits the message to an MS(Mobile Station)(90) through a paging channel among CDMA(Code Division Multiple Access) wireless channels.

Description

Method for cell broadcasting service in mobile communication system

The present invention relates to a cell broadcasting service (CBS) method in a code division multiple access (CDMA) mobile communication system. In particular, in a digital cellular system, a call channel (paging channel) among CDMA radio channels is fixed. The present invention relates to a cell broadcast service method in a mobile communication system that transmits a broadcast message to local mobile terminals or a specific group of mobile terminals at one time.

In general, a CDMA digital cellular system has a function called a short message service (SMS), which functions as a store and forward function of a message center, a CDMA access channel, a paging channel, and the like. A service function that can exchange short text messages between mobile terminals or between a mobile terminal and a message input device using a call channel.

As is well known, the short message service method applied to the existing digital cellular system can exchange short text messages through one-to-one communication between a mobile terminal to a mobile terminal or a mobile terminal to a message input device using a message center. However, there is a disadvantage in that text data services cannot be simultaneously provided to all mobile terminals of a certain region or all mobile terminals of a specific group.

Accordingly, the present invention has been proposed to solve various problems occurring in the short message service in the conventional digital cellular system as described above.

Disclosure of the Invention An object of the present invention is to provide a mobile communication system that transmits a broadcast message to mobile terminals in a specific region or mobile terminals of a specific group at a time by using a call channel (paging channel) of a CDMA wireless channel in a digital cellular system. The present invention provides a cell broadcast service method.

Cell broadcast service method in a mobile communication system according to the present invention for achieving the above object,

When the cell broadcast center requests broadcasting from the question processing function application unit (TCAP) in the exchange, requesting a TC from the question processing function application unit to the intra-exchange map handling interface unit (MHI);

Decoding the delivered broadcast request message and transmitting the decoded map handling interface unit to a mobile handling controller (MHC) in the exchange;

Receiving, by the hair handling controller, the broadcast request message according to a base station format and decoding the broadcast request message to a hair signaling access block (MSA);

Transmitting the decoded broadcast request message to a control station (BSC) in the hair signaling access block, and the received control station transmits the broadcast request message transmitted to a base station (BTS) as it is;

The base station receiving the broadcast request message may be configured to transmit a broadcast request message to a mobile station through a paging channel of a CDMA radio channel.

1 is a block diagram of a system for a cell broadcast service to which the present invention is applied;

2 is an interface relationship diagram of a mobile communication system for performing a cell broadcast service function according to the present invention;

3 is a protocol hierarchy diagram in the present invention,

4 is a flowchart illustrating a cell broadcast service method in a mobile communication system according to the present invention;

5 is a flowchart illustrating call processing between blocks for implementing a CBS function in the present invention.

6 is a table defining a map operation for an SMS broadcast service.

7A to 7H are source code tables of respective parameters of FIG. 6.

<Description of the code | symbol about the principal part of drawing>

30: message center 40: cell broadcast center

50: mobile communication switch 51: hair signaling access block

52: hair handling controller 53: map handling interface unit

54: question and answer processing function application unit 60: control station

70 base station 90 mobile station

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above in detail.

1 is a block diagram of a mobile communication system for a cell broadcast service to which the present invention is applied.

The network operation unit 10 (OMC / NMS) is a workstation (W / S) for network management and operation of a number of components (SMC, SMS server, CBC), and the operation and management terminal of the cell broadcast center. Can be used.

The short message service server 20 (SMS Server) delivers information provided by a plurality of information providers (IP) to the message center 30 (MC) or the cell broadcast center 40 (CBC), and the cell It plays the role of an information provider providing contents to be broadcast to a broadcast center.

The cell broadcast center 40 receives information to be serviced from the short message service server 20 or information providers (IPs), generates, stores, and manages an IS-637 broadcast message. Send a message to broadcast to the exchange.

The mobile communication switch 50 (MSC) receives a map operation for cell broadcasting from the cell broadcast center 40 and transmits a broadcast message to the control station 60 (BSC) and the base station 70 (BTS). To pass. By designating the base station address or control station address as a special value (oxFF), cell broadcasting in the control station unit and in the exchange unit can be performed.

Next, the control station 60 (BSC) is in charge of writing an SMS message to use the call channel, and transmits a message to use the access / paging channel to the base station 70 and transmits a cell broadcast service. When a message received from a gateway is broadcasted through a call channel, a data burst message is created. Cell broadcasting to a busy terminal in the jurisdiction of the control station 60 utilizes a traffic channel.

The base station 70 receives the broadcast message from the control station 60, generates a data burst message in accordance with the IS-95 format, and wirelessly transmits the data through the paging channel.

Lastly, the control station manager 80 (BSM) monitors the status of the base stations and reports the abnormality to the operation center periodically.

2 illustrates an interface relationship of each block for providing a cell broadcast service (CBS).

Here, the Um interface is an interface for connecting a short message service mobile terminal (MS) and a base station. The Um interface transmits a short message input from the mobile station to the base station and transmits a short message arriving at the base station to the terminal. The mobile terminal can send and receive a short message in an idle state, and can only receive a short message in a system access state and cannot make a call, and can receive a short message using an active traffic channel in a busy state. Do.

In addition, the N interface is an interface connecting the base station and the message center. If the message center is implemented inside the mobile communication exchange, it may be used as an internal interface, and if implemented outside, the IS-41C may be used.

The mobile communication switch 50 then performs an SMSDBC MAP operation implementation function, an IS-637 transport message synthesis function, a message delivery to the control station, and a routing function.

In the above, the SMSDBC map operation function interoperates with the cell broadcast center 40 through the SS # 7 signaling link, understands the SMSDBC map operation sent by the cell broadcast center, and accordingly, transmits to the cell broadcast center 40. In response, performs a function for cell broadcasting. In case of a negative response, an appropriate value for SMS_CauseCode, which is a parameter of SMSDBC, is sent (implemented in MHI, MHC block).

In addition, the IS-637 transport message synthesis function configures IS-637 transport messages based on SMS_BearerData and SMS_ServiceDataCory, which are parameters of an SMSDBC message (implemented in an MSA block).

In addition, the message forwarding and routing function to the BSC delivers the message received from the cell broadcast center through the map (SMSDBC) to the broadcast corresponding control station using IPC, and analyzes the contents of the SMSDBC parameter SMS_CellList to determine the corresponding control stations. . The IS-637 transport message and the SMSDBC parameters SMS_BCAddress and SMS_CellList are transmitted to the corresponding BSC using the protocol between the exchange and the control station (IPC) (implemented in the MSA and MHC blocks).

Next, the control station performs a message transmission and reception function with the mobile communication exchange, a cell broadcasting function through a communication channel, a message relay function between the mobile communication exchange and the base station, and a vocoder bypass function. .

First, the mobile communication exchange and the message transmitting / receiving function receive values from the mobile communication exchange through IPC to generate an IS-95 data burst message for cell broadcasting. In addition, the cell broadcasting function through the call channel configures an IS-95 data buffer message for cell broadcasting of the call channel to the mobile terminals in the control station's jurisdiction and broadcasts the call channel. The message relay function between the mobile communication exchange and the base station routes and transmits a message to be broadcast through a control channel to a designated base station. If the base station address is oxFF and the base station address is analyzed, the message is transmitted to all base stations below the control station. Otherwise, the message is transmitted only to the base stations.

The maximum length of data to be transmitted on the paging channel is the maximum length that can be carried in the data burst message on the paging channel of 9,600bps.

Next, the base station has a service option processing function (service option = 6), a cell broadcasting function through a paging channel, and a broadcasting function in a slotted mode, which will be described in more detail as follows.

First, the cell broadcasting function through a paging channel configures an IS-95 data burst message for cell broadcasting of a paging channel and broadcasts the paging channel. In addition, the broadcasting function in the slot mode is a function for transmitting a message to a mobile terminal operating in the slot mode, and should be able to support user data of up to 64 channels.

3 is a diagram illustrating a protocol layer function in the mobile communication system as shown in FIG. 1 to which the present invention is applied.

Here, the IS-637 teleservice protocol is a layer containing contents to be delivered to the mobile terminal through cell broadcasting and corresponds to bearer data. The cell broadcast center generates bearer data and delivers it to the exchange via a map (MAP).

In addition, the CBS MAP protocol means a map operation SMSDBC which is a communication means for cell broadcasting between a mobile communication exchange and a cell broadcast center. The bearer data, the service category, the BC address, and the cell list are transmitted to the exchange with parameters. The exchange receiving the SMSDBC Invoke sends it to the cell broadcast center as a result of the SMSDBC return. At this time, the exchange sends a positive or negative response depending on whether the broadcast is performed.

In addition, the IS-637 transport protocol obtains bearer data and service category values from SMSDBC parameters received from the cell broadcast center at the exchange to create an IS-637 transport message.

The IPC protocol sends an IS-637 transport message, BC address, and cell list to the broadcast control station via IPC at the exchange. The exchange may know the broadcast corresponding control stations by cell list analysis.

In addition, in the IS-637 relay protocol, a relay layer in a mobile terminal serves as a relay between a transport layer and a link (IS-95). The relay layer at the control station analyzes the cell list received from the mobile communication exchange to determine the base stations to route the broadcast message, and relays the broadcast message to the corresponding base stations through the IPC. The relay layer of the base station transmits the IS-637 transport message and BC address values received from the control station to the IS-95 layer to generate a data burst message.

In addition, in the IS-95 protocol, the relay layer of the base station generates a data burst message based on the IS-637 transport message and the BC address value received from the control station and transmits the data burst message to all mobile terminals in the base station jurisdiction. The IS-95 layer of the mobile terminal transmits and receives a message with the base station. The IS-95 layer of the mobile terminal receives the data burst message via the call channel or paging channel. When a message is received through the paging channel, the BC address of the message is checked and only the message selected to be received is sent to the upper layer.

4 is a flowchart illustrating a cell broadcast service method in a mobile communication system according to the present invention.

As shown, when the cell broadcast center 40 requests a broadcast to the TCAP 54 in the exchange 50, the intra-exchange map handling interface is requested by the TAC 54. Invoking the TC to the MHI 53 (S10 to S20); The invoked map handling interface unit 53 decodes the transmitted broadcast request message and transmits it to the hair handling controller (MHC) 52 in the exchange (S30); The hair handling controller 52 receiving the broadcast request message decodes the broadcast request message according to the shape of the base station and transmits the broadcast request message to the hair signaling access block (MSA) 51 (S40); The hair signaling access block 51 transmits the decoded broadcast request message to a control station (BSC), and the received control station transmits the broadcast request message to the base station (BTS) as it is (S50 to S60). )Wow; The base station receiving the broadcast request message transmits the broadcast request message to the mobile station through a paging channel of the CDMA radio channel (S70).

Referring to the accompanying drawings of the cell broadcast service method in the mobile communication system according to the present invention as described above in detail as follows.

First, in order to perform a cell broadcast service through a paging channel, the cell broadcast center 40 to the question processing function application unit 54 (TCAP: Transaction Capabilities Application Part) in the mobile broadcast switch 50 in step S10. Make a broadcast request (SMSDBC Invoke).

Next, in step S20, the question-and-answer function application unit 54 invokes the TC to the map handling interface unit 53 (MHI) (TC_INVOKEi).

In step S30, the map handling interface unit 53 decodes the delivered broadcast request message and transmits it to the hair handling controller 52 (MHC) (CB_SMSMsg_RQ). In addition, the cell broadcast center 40 returns a result of the broadcast request (SMSDBC Return Result). That is, the map handling interface unit 53 performs an unpacking operation on SMS_BearerData, SMS_ServiceCategory, SMS_BCAddress, and SMS_CellList with respect to Op_Code F2. When no error occurs, the map handling interface unit 53 broadcasts a message to the hair handling controller 52. In contrast, if an error occurs, the error return function must be transmitted to the question-and-answer function application unit 54.

In step S40, the hair handling controller 52 decodes the broadcast request message transmitted according to the base station shape and transmits the decoded broadcast request message to the hair signaling access block 51 (CB_SMSMsg_RQ_MI). That is, when receiving a broadcast request message, the hair handling controller 52 configures and transmits a CB_SMSMsg_RQ_MI signal to each ASS-M with reference to R_BS_INFO.dg, and transmits a return error to the map handling interface unit 53 when an error occurs. If no error occurs, the return result is sent. When sending a return error, insert the appropriate cause code in the CBS map.

Next, in step S50, the hair signaling access block 51 transmits a broadcast request message to the control station 60 (SMS_Main). Then, in step S60, the control station 60 delivers the broadcast request message to the base station 70 as it is. That is, the hair signaling access block 51 converts the IPC message format to the corresponding control station upon receiving CB_SMSMsG_RQ_MI and performs a function of delivering the cell broadcast service message. It also plays a role in composing a Transport Layer SMS Message.

The base station 70 receiving the broadcast request message transmits it to the mobile station 90 through a paging channel (Data Burst Msg) to perform a cell broadcast service.

6 is a table defining a map operation for an SMS broadcast service.

The number of operations added is one, and its name is SMS Delivery BroadCast (SMSDBC).

There are two methods of designating a broadcast associated with a map: a method of saving an entire MSC region and a method of designating a specific control station / base station.

The method of designating the entire area of the mobile switching center is that if the CI (Cell Identification) identifier value is "110", the SMSDBC operation has only a CI identifier and no list of CIs, which means that it broadcasts to all control stations / base stations. do.

Next, in a method of designating and broadcasting a specific control station / base station, when the CI identifier value is "10", the CI list must exist in the SMSDBC operation. The first octet of each CI list represents a control station number and the second octet represents a base station number. If the base station number is oxFF, it means broadcasting to all base stations of the designated control station. If the base station number is not oxFF, the broadcast message should be delivered only to the base station of the corresponding number.

FIG. 7A is a table showing parameters used in the SMSDBC, and includes SMS_BearerData, SMS_CauseCode, SMS_Service-Category, SMS_BCAddress, and SMS_CellList.

In FIG. 7A, A means that the mobile switch is included when possible to make a positive acknowledgment to the cell broadcast center, and B means when the mobile switch makes a negative acknowledgment to the cell broadcast center. It is meant to be included.

FIG. 7B is a source code table of SMS_BearerData among parameters of FIG. 7A, in which BearerData corresponding to a teleservice layer message of IS-637 is recorded.

FIG. 7C is a source code table of SMS_CauseCode among the parameters of FIG. 7A, which is included in a negative acknowledgment indicating that broadcast is not possible according to the request of the SMSDBC of the mobile communication exchange, and the reason of the negative response is recorded.

FIG. 7D is a source code table of SMS_ServiceCategory among parameters of FIG. 7A, which is a component of a transport layer message of IS-637, which contains a service category value indicating the type of broadcast service, and has a length of 2 bytes.

FIG. 7E is a source code table of SMS_BCAddress among parameters of FIG. 7A, which is a value of BC_ADDR entered in an address field when generating a data burst message of a paging channel. The internal field of BC_ADDR follows the IS-637 standard.

FIG. 7F is a source code table of SMS_CellList among parameters of FIG. 7A, which is a list of a control station and a base station to which a broadcast message is to be delivered, and a mobile communication exchange receiving an SMSDBC should deliver a broadcast message to all control stations specified in SMS_CellList.

FIG. 7G shows a CI identifier table in FIG. 7F, and FIG. 7H is a table showing CI values in FIG. 7F.

As described above, the present invention has the effect of enabling a cell broadcast service using a paging channel among CDMA radio channels.

In addition, by specifying a base station address or a control station address as a special value (for example, oxFF), there is an effect that selective cell broadcasting can be performed on a control unit basis or a base station basis.

Claims (4)

In the cell broadcast service method of a mobile communication system, Requesting a TC from an inter-exchange map handling interface unit (MHI) to the intra-exchange map handling interface unit (MHI) when a cell broadcast center requests a broadcast from the interrogation function application unit (TCAP) in the mobile communication exchange; The map handling interface unit decoding the transmitted broadcast request message and transmitting the decoded broadcast request message to a hair handling controller (MHC) in the mobile communication switch; Receiving the broadcast request message by the hair handling controller and decoding the broadcast request message according to a base station format and delivering the broadcast request message to a hair signaling access (MSA) block; Transmitting the decoded broadcast request message to a control station (BSC) in the hair signaling access block, and the received control station transmits the broadcast request message transmitted to a base station (BTS) as it is; The base station receiving the broadcast request message comprises the step of transmitting a broadcast request message to the mobile station, the cell broadcast service method in a mobile communication system. The mobile communication switch according to claim 1, wherein the mobile communication switch specifies a special value in a control station address or a control station address in a cell broadcast service to control the cell broadcasting to be performed in a specific control unit or in an exchange unit. Cell broadcast service method in a system. 3. The mobile communication switch of claim 2, wherein the mobile communication switch records the first octet of each CI list in the control station number and the second octet in the base station number, and designates the base station number as a special value (oxFF) to all base stations of the control station. Cell broadcast service method in a mobile communication system characterized in that to transmit a broadcast message, or to transmit a broadcast message only to the base station of the corresponding number by recording the base station number other than a special value (oxFF). The method of claim 1, wherein the base station transmits a broadcast request message to a mobile station through a paging channel of a CDMA radio channel when the base station transmits a broadcast request message to the mobile station.