KR20000062204A - Message re-transmission method and repetition message processing method of mobile station using it on communication network - Google Patents

Abstract

PURPOSE: A method for processing overlapped messages of a terminal is provided to process the overlapped messages generated when short message services(SMSs) or broadcasting information services are retransmitted, by using a service category number(SCN) and a message identification(MID) to store history of previously-received messages. CONSTITUTION: If a message is received in a terminal, the terminal analyzes a field of the message. The terminal retrieves a history buffer storing history of the message. A service category and an identification of the message are compared on the basis of the history of the message. If the service category and the identification are equal to a prestored service category and a prestored identification, the message is considered as an overlapped message. The overlapped message is ignored.

Description

Message re-transmission method and repetition message processing method of mobile station using it on communication network}

The present invention solves the message duplication problem caused by retransmission of a broadcast type information service or a short message service (SMS) in a mobile communication system, thereby improving memory usage efficiency, increasing customer convenience, and increasing terminal efficiency. The present invention relates to a method of transmitting duplicate messages in a mobile communication network, a method of processing duplicate messages in a terminal using the same, and a computer-readable recording medium having recorded thereon a program for realizing the method.

Code Division Multiple Access (CDMA) Mobile communication systems have SMS, a service that delivers text messages to users. Such SMS is defined in the international standard "TIA / EIA / IS-637". The dual broadcast type information service is a service implemented by using cell broadcasting, which is a type of SMS defined in "TIA / EIA / IS-637".

SMS includes Mobile Termination (MT), Mobile Origination (MO) SMS, Cell Broadcasting (CB), and Information On Demand (IonD).

Such a broadcast type information service only delivers a message to several terminals at the same time in a CDMA system as defined in "IS-637", and the terminal receiving the message does not respond to the system network with an acknowledgment message. That is, the broadcast type information service is a one-way message transfer service from the network to the terminal.

Therefore, in the related art, due to the feature of the unidirectional nature of a broadcast type information service, it is not known whether a terminal receives a message correctly in a network. Due to this feature, there is a problem in that it is not possible to guarantee whether the terminal receives the transmitted message.

The present invention has been made to solve the problems described above, by using the service range number (SCN) and the message identification number (MID) in the terminal of the mobile communication system by storing the history of the previously received messages broadcast type information service (B) a method of duplicate transmission of a message in a mobile communication network and a method of processing a duplicate message in a terminal using the same, by resolving a problem of receiving duplicate messages generated in a short message service (SMS) retransmission; It is an object of the present invention to provide a computer-readable recording medium having recorded thereon a program for realizing the method.

In addition, the present invention in the mobile communication system when operating the history buffer of the cell broadcasting center or the terminal by pooling the service range number (SCN) and the message identification number (MID) pair of the corresponding message stored in the history buffer, Another object of the present invention is to provide a method of transmitting duplicated messages in a mobile communication network, a method of processing duplicated messages in a terminal using the same, and a computer-readable recording medium storing a program for realizing the method.

1 is an exemplary configuration of a system for a broadcast type information service to which the present invention is applied.

2 is a flowchart illustrating a method of processing a duplicate message in a terminal according to the present invention.

3 is a flowchart illustrating a method of transmitting duplicate messages in a mobile communication network according to the present invention.

4 is a flowchart illustrating another embodiment of a method of transmitting duplicate messages in a mobile communication network according to the present invention;

Figure 5 is a flow diagram of one embodiment of a history buffer management method according to the present invention.

* Explanation of symbols for the main parts of the drawings

11 mobile station (MS) 12 base station (BTS)

13: control station / station (BSC / MSC) 14: home position register (HLR)

15: Short Message Center (SMC) 16: Short Message Service (SMS) Server

17: Operation Management Center (OMC) 18: Cell Broadcasting Center (CBC)

19: information provider (CB) for cell broadcasting (CB)

In order to achieve the above object, the present invention provides a method for processing a duplicate message in a terminal applied to a mobile communication system, the service range number (SCN) and message identification number (MID) value of a first message received from the mobile communication network. A first step of storing, by the terminal, a pair in its history buffer; When the second message is received by the terminal, the terminal analyzes the field of the second message to search the history buffer, and the service range number (SC) of the first message and the second message in the history buffer. A second step of comparing a message identification number (MID); And a third of the terminal disregarding the second message matching the service range number SCN and the message identification number MID of the first message as a duplicate received message according to the comparison result of the second step. Characterized in that it comprises a step.

In order to achieve the above object, the present invention provides a message (MAX_TRY_NUM) indicating a maximum number of times a message is transmitted from the mobile communication network to a terminal in the method of transmitting duplicate messages in a mobile communication network. A first step of setting a time according to a period of obtaining from a cell broadcast information provider, a period of a message transmitted for each service range, and a importance of a message to be transmitted; A second step of analyzing a message to be transmitted and setting a value MAX_TRY_NUM indicating a maximum number of transmissions to a depth N of a history buffer of the terminal in a corresponding service range; And within a range in which the depth N of the history buffer of the terminal is greater than zero (0), the depth N of the history buffer of the terminal is sequentially reduced one by one, thereby sending a message to the terminal. Characterized in that it comprises a third step of transmitting to.

In addition, the present invention provides a message duplication transmission method in a mobile communication network applied to a mobile communication system, comprising: a transmission counter (TC), a service range number (SCN), and message identification in which the number of transmissions of a message to be transmitted from the mobile communication network to a terminal is stored; Providing a history buffer in which a number (MID) is stored in a broadcast server in the mobile communication network; A second step of the broadcast server generating a broadcast message; A third step of the broadcast server searching the history buffer to compare the number of retransmissions with the transmission counter to determine whether to transmit the broadcast message; And canceling the message transmission when the transmission counter TC is greater than the number of retransmissions according to the comparison result of the third step, and transmitting the broadcast message to the terminal when the transmission counter TC is not large, and transmitting the transmission counter TC. It is characterized by comprising a fourth step of increasing one.

According to an aspect of the present invention, a mobile communication system having a processor includes a pair of a service range number (SCN) and a message identification number (MID) value of a first message received from a mobile communication network. A first function of storing in its own history buffer; When the second message is received by the terminal, the terminal analyzes the field of the second message to search the history buffer, and the service range number (SC) of the first message and the second message in the history buffer. A second function of comparing message identification numbers (MIDs); And a third of the terminal disregarding the second message that matches the service range number SCN and the message identification number MID of the first message as a duplicate received message according to a comparison result of the second function. A computer readable recording medium having recorded thereon a program for realizing the function is provided.

In addition, the present invention provides a mobile communication system having a processor, the period (MAX_TRY_NUM) indicating the maximum number of transmissions from the mobile communication network to the terminal, the period for obtaining a message from the information provider for cell broadcasting (CB), A first function set according to a period of a message transmitted for each service range and an importance of a message to be transmitted; A second function of analyzing a message to be transmitted and setting a value MAX_TRY_NUM indicating a maximum number of transmissions to a depth N of a history buffer of the terminal in a corresponding service range; And within a range in which the depth N of the history buffer of the terminal is greater than zero (0), the depth N of the history buffer of the terminal is sequentially reduced one by one, thereby sending a message to the terminal. A computer readable recording medium having recorded thereon a program for realizing a third function of transferring to a computer is provided.

In addition, the present invention provides a mobile communication system having a processor, a history buffer in which a transmission counter (TC), a service range number (SCN), and a message identification number (MID) storing the number of transmissions of a message to be transmitted from the mobile communication network to the terminal are stored. A first function provided to a broadcast server in the mobile communication network; A second function of the broadcast server generating a broadcast message; A third function of the broadcast server searching the history buffer to compare the number of retransmissions with the transmission counter to determine whether to transmit the broadcast message; And canceling the message transmission when the transmission counter TC is greater than the number of retransmissions according to the comparison result of the third function, transmitting the broadcast message to the terminal when the transmission counter TC is not large, and transmitting the transmission counter TC. A computer readable recording medium having recorded thereon a program for realizing a fourth function of increasing one.

The present invention solves the problem of duplicate message reception that may occur in broadcasting information service or short message service (SMS) retransmission, thereby increasing the convenience of the customer and preventing the unnecessary operation of the terminal to increase the terminal efficiency.

To this end, the present invention stores a history of previously received messages by using a Service Category Number (SCN) and a Message IDentification (MID) pair in a terminal of a mobile communication system. It is possible to solve the problem of duplicate message reception caused by SMS retransmission.

In addition, the present invention manages the memory space as a single pool (POOL) without dividing the history buffer for each Service Category (SC) in the cell broadcasting center, and manages the history buffer to manage the history buffer. By comparing the transmission counter (TC: Transmission Counter) and the number of retransmissions of the corresponding message stored in the network, the retransmission is determined according to the comparison result, thereby solving the problem of duplicate message transmission. In addition, the message transmission problem may be solved by determining a transmission period when transmitting a message in advance and then operating a timer based on the value to cancel retransmission when the timer expires. In addition, by managing the same history buffer in the terminal, it is possible to solve the problem of receiving duplicate messages.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration of a system for a broadcast type information service to which the present invention is applied.

As shown in FIG. 1, a system for a broadcast type information service to which the present invention is applied includes a mobile station (MS) 11, a base station transceiver system (BTS) 12, and a control station / switch station. (BSC / MSC: Base Station Controller / Mobile Switching Center) (13), Home Location Register (HLR) (14), Short Message Center (SMC: SMS Message Center) (15), Short Message Service (SMS) Server 16, Operation Management Center (OMC: Operating Management Center) 17, Cell Broadcasting Center (CBC: Cell Broadcating Center), and Cell Broadcasting (CB) Information Provider (19) do.

The mobile station 11 is in the range of any base station 12, and the information of the mobile station 11 is transmitted to the base station 12 and the controlling station / switching station 13 controlling it, from the control station / switching station 13 The transmitted information is transmitted to the mobile station 11 via the base station 12.

The mobile station 11 is a terminal that a user can carry and communicate with while moving. The mobile station 11 uses a forward channel for text reception and a reverse channel for transmission. In this case, all text information uses SMS, and when received, the mobile SMS is used, and when the SMS is transmitted, the mobile SMS is used.

The mobile station 11 is a terminal capable of duplication of messages using a history of a service range number (SCN) and a message identification number (MID) pair (Pair), and is registered in SMS and CB services. The mobile station 11 includes a short service system (i.e., a short message center 15, a short service server 16, a cell broadcast center 18, etc.) through a base station 12, a control station / switch station 13, and the like. Logical connection is made.

In general, a mobile communication system uses a data burst message of a paging channel of a CDMA mobile communication system upon reception, and data of a forward traffic channel when a user is busy. Send the text message as a burst message. In addition, when a text message is transmitted within a predetermined length, the data burst message of an access channel is used, and when the text message is transmitted or transmitted, the data burst message of a reverse traffic channel is used.

The text message transmitted and received at the mobile station 11 is connected to the control station / switch station 13 through the base station 12 for high frequency signal processing and call processing.

The base station 12 connects the mobile station 11 to the control / switching station 13, and the digital channel unit (DCU), time / frequency control unit (TCU), radio frequency unit (RFU), and positioning system (GPS). ) And the like.

Then, the base station 12 performs a wired / wireless conversion function of communicating with the mobile station 11 via radio and communicating with the control station / exchange station 13 by wire.

Looking at the function of the control station / switch station 13, the control station connects the base station 12 to the switching station to coordinate the connection between the base stations 12, and serves as a signal processing function for communication between the base station 12 and the switching station, Processes the mobile communication subscriber call in association with the home location register 14 and the short message center 15. In addition, the switching center connects with the control station to perform call setup and release functions of the mobile station 11, and performs various functions related to call processing and additional services.

This control station / station 13 is responsible for routing general calls, SMS messages and the like.

The home location register 14 is a database connected to the control station / exchange station 13 and the short message center 15 to manage various information of mobile subscribers, and has information on subscription of additional services such as SMS and CB. .

The home location register 14 performs functions such as subscriber location registration in conjunction with various control stations / switch stations 13, stores permanent information and location information of the mobile station 11 and subscribers, It interacts with a visitor location register (VLR) that temporarily stores subscriber information associated with the mobile station 11 that is implemented to support various functions related to call processing and supplementary services.

The short message center 15 is connected to the control station / exchange station 13, the home location register 14, the short service server 16, the operation management center 17, and plays a key role in SMS processing, and sets SMS parameters. Then, the message is transmitted to the network element to be processed by using a teleservice identifier (TI) and destination address (Destination Address) of the input signal. In particular, the short message center 15 transmits a signal input from the control station / switching station 13 to the short service server 16 when the message is set to the short service server 16.

The short message service server 16 interworks with the operation management center 17, the cell broadcast center 18, and the cell broadcast information provider 19, and in particular, the short message service center 15 interoperates with the SMS subscriber's terminal type and service. Types and the like are stored, and information from the outside is transmitted to the short message center 15 using the corresponding communication service identifier (TI).

The Cell Broadcasting Center (CBC) 18 is a server that works with broadcast type information service, also called a Cell Broadcasting Server (CBS: CB Server), and is connected with a cell broadcasting information provider 19 to receive information therefrom and broadcast. It performs core functions related to broadcasting information service such as transmission and scheduling of information message.

As described above, the system for broadcasting type information service to which the present invention is applied takes the information to be broadcast from the cell broadcasting center 18 and according to the retransmission related algorithm, the short message center 15, the switching center / control station 13, and the base station. The data is transmitted to the mobile station 11 via (12), and the mobile station 11 processes the message according to the duplication processing algorithm.

As described above, a message is retransmitted in a network after a predetermined time, and the present invention relates to a cell broadcasting system operation technique and a message duplication reception process according to the terminal 11. .

Now, a structure of a data burst message transmitted on a paging channel used in the present invention will be described. The structure of the " IS-95 " data burst message to which such a cell broadcast (CB) message is transmitted is shown in Table 1.

Field Description Length (bits) Message type (MSG_TYPE) ("00001001")-Data Burst Message 8 Response sequence (ACK_SEQ) ("000")-disabled 3 Message sequence (MSG_SEQ) 3 Reply request (ACK_REQ) ("0")-No broadcast response required One Valid Response (VALID_ACK) ("0")-not required One Address type (ADDR_TYPE) ("101")-address for CB 3 Address length (ADDR_LEN) ("01001")-5 octets 4 Address (ADDRESS) Broadcast address 40 (8 × 5) Message number (MSG_NUMBER) ("1")-default 8 Burst Type (BURST_TYPE) ("000011")-Message for IS-637 6 Number message (NUM_MSGS) ("1")-default 8 Number Fields (NUM_FIELDS) Number of transport layer (CHARi) fields 8 Character (CHARi) Transport Layer Messages 8 × NUM_FIELDS RESERVED 5

Referring to (Table 1), since the Ack procedure for layer2 processing of "IS-95a" is not used in broadcasting, the response sequence (ACK_SEQ), message sequence (MSG_SEQ), response Request (ACK_REQ), valid response (VALID_ACK), etc. are not used in a special meaning.

Here, when the address type (ADDR_TYPE) is broadcast, it is determined as "101", and a broadcast address (Broadcast Address) for broadcasting is included in the address field. Since the length is fixed to 5 bytes, the address length (ADDR_LEN) value is Is set to "101".

The double character (CHARi) part is a transport layer message for a cell broadcast server (CBS).

In the case of cell broadcasting, the value of the address type ADDR_TYPE is set to "101", and has an address parameter as shown in Table 2 below.

Field Description Length (bits) Priority ("00")-disabled 2 Message identification number (MSG_ID) 6 Zone Identification Number (ZONE_ID) ("0x00")-disabled 8 SERVICE Same as service range value 16 Language (LANGUAGE) ("00000001")-English ("11111110" 0-Korean 8

Table 2 shows the broadcast message address parameter values. The address of the CBS address parameter is entered in the paging record of the general paging message and the address field of the data burst message.

Referring to (Table 2), the message identification number (MESSAGE_ID) is the identification number of the message, the service (SERVICE) is two bytes corresponding to the BC service range (SERVICE CATEGORY) of the transport layer (Transport Layer).

The language is applied in the same manner as the language indicator of the communication service layer. That is, the language indicator value uses "00000001" (0x01) in English and "11111110" (0xFE) in Korean.

Now, message structures in a transport layer and a teleservice layer for broadcasting will be described.

Table 3 shows the message structure in the transport layer of the CB message, and Table 4 shows the message structure in the communication service layer of the CB message.

Field Description Length (bits) SMS message type (SMS_MSG_TYPE) ("00000001")-broadcast 8 Parameter Identification Number (PARAMETER_ID) ("00000001")-BC range 8 Parameter length (PARAMETER_LEN) ("00000010")-default 8 BC Service Coverage (BC_SERVICE_CATEGORY) Service value of the BC address (BC_ADDR) 16 Parameter Identification Number (PARAMETER_ID) ("00001000") 8 Parameter length (PARAMETER_LEN) The octet number of the message 8 Subparameter Identification Number (SUBPARAMETER_ID) Communication service parameter identification number 8 Subparameter Length (SUBPARAMETER_LEN) The octet number of the message 8 Subparameter data Bearer data content 8 × SUB_LEN Subparameter Identification Number (SUBPARAMETER_ID) Communication service parameter identification number 8 Subparameter Length (SUBPARAMETER_LEN) The octet number of the message 8 Subparameter data Bearer Data Content 8 × SUB_LEN Depending on the communication service, the above three messages may be increased.

Field Description Message Identifier Selection Message Separation for CBS User Data private CBS actual message content MC Time Stamp Selection Transmission time information Validity Period-Absolute Selection Do not use Validity Period-RELATIVE Selection Do not use Priority Indicator Selection Do not use Alert delivery for messages Selection CBS message arrival alert? Language Indicator Selection Language coding of messages (mostly Hangul) Call Back Number Selection Added part from SKT

Referring to Table 3, in the case of a cell broadcast message in the transport layer field, the SMS message type SMS_MSG_TYPE is set to "00000001". The BC service range is set equal to the service value of the BC address BC_ADDR.

Referring to Table 4, a Teleservice Layer Message corresponds to bearer data of a Transport Layer Message.

The service category and message ID are used to process the duplicated messages. Accordingly, the problem of duplicated message reception is solved by scheduling retransmission in the network. This process is described in detail as follows.

2 is a flowchart illustrating a method of processing a duplicate message in a terminal according to the present invention.

In order to determine whether a message is duplicated, a history buffer in the terminal must store the history of previously received messages, and it is determined whether the message is duplicated based on this history. Here, the service range and message identification number fields are used as a means of storing such a history.

As shown in FIG. 2, in the method of processing a duplicate message in a terminal according to the present invention, when a message is first received at the terminal (201), the terminal analyzes a field of the received message (202) and searches a history buffer. (203). At this time, the history buffer stores a pair of the history of the received message (that is, the service range and the message identification number), and compares the service range and the message identification number of the received message with the history (204). ).

As a result of the comparison, if the service range and the message identification number of the received message coincide with the service range and the message identification number of the previously stored message, the received message is ignored as a duplicate received message (205).

The history buffer is changed as follows.

The history buffer stores n history for each service range (where n is a value between 1 and 63).

When a message is received, the terminal stores a pair of service range number (SCN) and message identification number (MID) value of the received message in the history buffer, if the MID value is not stored in the history buffer (i.e. (If it's a new message that you haven't remembered), save the space if it's empty. However, if there is no space to store it, the oldest one is deleted and stored in place.

The terminal repeats this process every time a message is received.

As such, the process of changing the history in the history buffer will be described in more detail as follows.

When the service range values are assumed to be 17 and 18, and the n value is assumed to be 3, the order of messages transmitted from the network and the change of the history buffer of the terminal receiving the message are shown in Table 5.

Service Range Number (SCN) 17 18 17 18 18 18 17 17 18 17 Message identification number (MID) 0 0 0 One 2 3 One 0 4 2

* ^

As time passes in (Table 5), when the message is transmitted from the CDMA system by the time indicated by "*", the change in the contents of the history buffer of the terminal is shown in (Table 6).

Service Range Number (SCN) 17 18 Memorized message identification number (MID) 0 0 One 2

In Table 5, the contents of the terminal history buffer when the message has been transmitted until the time indicated by "^" after all messages are transmitted are shown in Table 7.

Service Range Number (SCN) 17 18 Memorized message identification number (MID) 0 3 One 4 2 2

As shown in Tables 6 and 7, the history buffer of the terminal operates according to the operation principle of a circular queue having a depth of "n" for each service range.

Referring to (Table 6) and (Table 7), the history buffer stores the message identification number (MID) for each service range (SC), and when a new message is received, the message identification number (MID) of the corresponding service range (SC). ) And ignore if found to be a duplicate.

In order for message redundancy to work smoothly, the network needs to adjust the retransmission cycle and the number of times in consideration of the operation of the terminal.

FIG. 3 is a flowchart illustrating a method of transmitting duplicate messages in a mobile communication network according to the present invention, and illustrates an operation of a cell broadcast server (CBS) for scheduling message transmission in a network.

Referring to FIG. 3, such an algorithm is performed for each service range, and when the number of service ranges used is increased, each service range must manage and perform each of these algorithms.

Here, MAX_TRY_NUM is a value indicating the maximum number of transmissions, which is determined according to the period of obtaining a message from the information provider 19 for cell broadcasting (CB), the period of messages transmitted by category, the importance of the message to be transmitted, and the like. do.

In addition, the message retransmission period should be shorter than the time at which N messages, which are the depth of the history buffer of the terminal, are transmitted in the corresponding service range.

As shown in FIG. 3, the message duplication transmission process in the mobile communication network according to the present invention first analyzes a message to be transmitted (301) and indicates a maximum value (MAX_TRY_NUM) indicating the maximum number of transmissions in the corresponding service range. The depth (N) of the history buffer of the terminal is set (302).

Thereafter, in a range 305 where N is greater than zero (“0”), N is sequentially reduced by one by one (304) to send a message (303). In addition, in order to transmit N times, the variable may initially be set to "0" and sequentially increased until it becomes N value.

However, if the terminal determines whether the same history buffer is provided for each broadcast type service range and if the terminal overlaps, the memory having a short service range is frequently updated when the message broadcast period is different, but the memory having a long service range is updated. Is not used well, which reduces the memory usage efficiency. This will be described in more detail.

The broadcast type information service is a service implemented using a cell broadcast (CB), which is a type of SMS defined in "TIA / EIA / IS-637". Such a broadcast type information service only delivers a message to multiple terminals at the same time in a CDMA mobile communication system as defined in "IS-637", and the terminal receiving the message does not transmit an acknowledgment to the system network. . In other words, the broadcast type information service is a one-way message transfer service from the network to the terminal.

However, the broadcast type information service provided in the mobile communication network is retransmitting the same message at regular intervals in order to increase the reception rate of the message. In contrast, the terminal internally includes a history buffer, and based on information on a previously received message through operation of the history buffer, a newly received message and whether or not it has been received previously are determined to be redundant. Message is ignored.

However, in the operation of such a history buffer, the redundant message processing scheme in the terminal causes a significant waste of memory space when the transmission interval of the transmitted message is atypical. That is, since n message identification numbers (MIDs) are stored per service range SC when the history buffer is operated, n * c sized memory space is required when the number of service ranges is c. In addition, when the message retransmission period is different for each service range, the update period of the history buffer is different for each service range, thereby decreasing memory usage efficiency, and only overlapping n-value messages, which is the number of messages stored for each service range, can be duplicated.

In order to process the duplicated message, the history buffer is managed by the cell broadcast center 18 of the network by using the service range number (SCN) and the message identification number (MID), and the retransmission scheduling is performed to solve the duplicate message problem. I can solve it. In addition, the history buffer is provided in the memory, and considering the situation of the terminal where the memory is limited through the history buffer, even when the message transmission interval is irregular, it is possible to process duplicate messages transmitted in the network while increasing memory efficiency. .

Accordingly, the present invention can increase the memory usage efficiency by pooling the service range number (SCN) and the message identification number (MID) of the corresponding message stored in the history buffer when the history buffer is operated in the mobile communication system. In addition, the present invention pool management of the service range (SC) and the message identification number (MID) pair of the corresponding message when operating the history buffer in the cell broadcast center of the mobile communication system and the transmission counter (TC) and the number of retransmissions By comparing, the memory usage efficiency can be improved by solving the message duplication problem generated when retransmitting the broadcast type information service or the short message service (SMS). In addition, when operating the history buffer in the terminal of the mobile communication system, the service range number (SCN) and message identification number (MID) pairs of the corresponding messages are integrated and managed to retransmit the broadcast type information service or the short message service (SMS) from the communication network. By solving the message duplication problem generated at the time, it is possible to increase the memory usage efficiency.

As described above, a method of operating such a history buffer in the cell broadcasting center 18 or the mobile station 11 of the mobile communication network, which can solve the message duplication problem and improve the use efficiency of the memory, will be described in more detail.

First, a description will be given focusing on the process of managing the history buffer in the cell broadcast center 18.

The cell broadcast center 18 has a history buffer of (transmission counter TC, service range number (SCN), message identification number (MID)) and tuples. At this time, the size of the history buffer should be a size that can store tuples smaller than 63 (that is, the size of the history buffer ≤ 63).

When the cell broadcast center 18 transmits a message, it checks whether the (TC, SCN, MID) tuple of the message is in the history buffer in the history buffer, and compares the retransmission counter with the number of inputs requested. If there is more, the transmission is canceled. If there is less, it is not a duplicate transmission. After transmission, the counter value of the corresponding (CT, SCN, MID) tuple is increased. Deletion of data from the history buffer is based on a first in first out (FIFO) method. In addition, it must have a respective history buffer for each broadcasting area at the time of storage.

As such, when the history buffer is provided in the cell broadcast center 18, the message transmission process will be described with reference to FIG.

FIG. 4 is a flow chart of another embodiment of a method of transmitting duplicate messages in a mobile communication network according to the present invention, and shows a message transmission procedure of a broadcast server when a history buffer is placed in a cell broadcast center 18 which is a broadcast server.

As shown in FIG. 4, in the message overlapping transmission method in the mobile communication network according to the present invention, when a broadcast message transmission request is first received (401), a broadcast message is generated in a cell broadcast center 18, which is a broadcast server ( 402).

Thereafter, in order to determine whether to transmit the generated message, (SCN, MID) pairs of the history buffer stored in the broadcast server are searched (403) and whether there is a generated message in the history buffer is analyzed (404).

As a result of the analysis, if the generated message is not in the history buffer, the message is transmitted and the counter value is increased by one (406).

If the generated message is in the history buffer, the number of retransmissions is compared with the counter value in the history buffer (405). If the counter value is larger than the number of retransmissions, the message is canceled. Increment the counter value by one (406).

As described above, in the present embodiment, it is assumed that the cell broadcast center 18 manages the history buffer to solve the message duplication problem, but the mobile station 11 also manages the history buffer in the same manner to achieve the same effect as the present embodiment. It can be configured to be made, and in this case, it should be apparent that the same as the present embodiment. This will be described in more detail.

In order to determine whether a message is duplicated, the terminal must store a history of previously received messages, and it is determined whether the message is duplicated based on the history. The service range number (SCN) and message identification number (MID) fields are used as a means of storing this history. That is, the history buffer stores pairs SCN and MID of the service range number SCN and the message identification number MID of the received message. With this history, when the terminal receives the message, it compares the service range number (SCN) value and the message identification number (MID) value of the received message and ignores the message if it matches.

At this time, the history buffer is operated in the terminal. The history buffer is divided into service ranges (SCs), and the entire memory space is used as one pool.

The basic form of the history buffer used in the present invention and an example of storing the history buffer when the messages illustrated in Table 7 above are transmitted are shown in Table 8.

〈17,0〉 〈17,1〉 〈18,0〉

Assuming that the minimum number of broadcast channels is C, the size of the history buffer is greater than or equal to 63 and less than or equal to C.

Here, if C or less, a channel cannot be duplicated, and if more than 64, a message may not be received.

When the terminal receives the message, the service range number (SCN) and message identification number (MID) pair of the message is compared to the pair (SCN, MID) remaining in the history buffer operated in the pool method. That is, if it turns out to be a new message, it records it by erasing the oldest. Let's look at an example of this approach.

For example, as shown in Table 9, two channels for providing a broadcast service are A and B (assuming that service category values '17' and '18' are used), and the transmission period of the message is shown. Are 40 minutes and 2 hours, respectively, and the size of the history buffer is 8, the contents of each history buffer 4 hours and 6 hours after the initial reception of the message are shown in Table 10 and Table 11.

time 0:00 0:01 0:40 1:20 2:00 2:01 2:40 3:20 4:00 4:01 4:40 5:20 6:00 channel A B A A A B A A A B A A A MID 0 0 One 2 3 One 4 5 6 2 7 8 9

Index (SCN, MID) 0 (A, 6) One (B, 0) 2 (A, 1) 3 (A, 2) 4 (A, 3) 5 (B, 1) 6 (A, 4) 7 (A, 5)

Index (SCN, MID) 0 (A, 6) One (B, 2) 2 (A, 7) 3 (A, 8) 4 (A, 9) 5 (B, 1) 6 (A, 4) 7 (A, 5)

As shown in Table 10 and Table 11, in the case of the A channel that frequently transmits information, the range of MIDs capable of redundant transmission in the network is widened. For example, in the case of the A channel, the terminal does not receive duplicated data even if (A, 0) is retransmitted several times before (A, 6) is transmitted.

As such, in the case of a message with a short transmission period, more duplicate messages can be determined as duplicates, which gives the operator flexibility in scheduling retransmission algorithms. In addition, the terminal can efficiently use less space in order to produce an effect for overlapping processing.

When the history buffer is operated by the terminal in the manner described above, two methods may exist in the network for transmitting the SMS message in order to retransmit such that duplicate reception does not occur in the terminal.

One method is to operate the history buffer together with the terminal. That is, if a message previously sent while the history buffer is also operated in the broadcast server transmitting the message is deleted from the history buffer, the retransmission is cancelled.

The other method is to predetermine the retransmission period according to the new message transmission interval and the history buffer size for every broadcast channel, and then operate the timer based on the value and cancel the retransmission when the timer expires.

Now, a method of operating the history buffer as described above in the terminal or the broadcast server will be described with reference to FIG. 5.

FIG. 5 is a flowchart illustrating a method for managing a history buffer according to the present invention, and illustrates a procedure in which a terminal has a history buffer or a broadcast server and operates in the same manner.

As shown in FIG. 5, in the history buffer management method according to the present invention, when a broadcast message processing request is first received (501), a history buffer for storing (SCN, MID) pairs of the corresponding message is searched (502). .

As a result of the search, the message is ignored, and if there is no space left in the history buffer (503), if there is space to store it is stored in the remaining space (504), the oldest pair (SCN) MID) is deleted and stored in the space (505). At this time, the deletion of the pair SCN and MID is based on a first in, first out (FIFO) method.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention solves the problem of duplicate message reception that may occur in the broadcast type information service or SMS retransmission, thereby increasing the convenience of the customer and preventing unnecessary operation of the terminal, thereby improving the efficiency of the terminal. In retransmission to increase the reception rate in cell broadcasting, which is a unidirectional transmission method, it is possible to reduce terminal power consumption and increase user convenience by not displaying a message already received.

Claims (11)

A duplicate message processing method in a terminal applied to a mobile communication system, A first step of storing, by the terminal, a pair of a service range number (SCN) and a message identification number (MID) value of a first message received from a mobile communication network in its history buffer; When the second message is received by the terminal, the terminal analyzes the field of the second message to search the history buffer, and the service range number (SC) of the first message and the second message in the history buffer. A second step of comparing a message identification number (MID); And A third step of the terminal disregarding the second message matching the service range number (SCN) and the message identification number (MID) of the first message as a duplicate received message according to the comparison result of the second step; Duplicate message processing method in a terminal comprising a. The method of claim 1, The terminal, The same history buffer for each service range is determined to determine whether a message is duplicated, and when a message is received, a pair of a service range number (SC) and a message identification number (MID) value of the message is stored in the history buffer. If the message ID is not stored in the history buffer (MID) (i.e., a new message that has not been stored) and the space to be stored is empty, the message is stored in the history buffer. Duplicate message processing method in a terminal, characterized in that. The method of claim 1, The terminal, The memory buffer of the history buffer is managed as a whole pool to determine whether a message is duplicated, and when a message is received, a pair of service range number (SC) and message identification number (MID) value of the message. In the history buffer, if the message identification number (MID) that is not stored in the history buffer (that is, a new message that has not been stored) and the space to store is empty, it is stored in the history buffer, and the space to store If there is none, the oldest one is deleted and stored in its place. The method according to any one of claims 1 to 3, The mobile communication network, In order to reduce the number of retransmissions, a transmission counter having the history buffer in a broadcast server and storing the number of transmissions besides a pair of service range number (SCN) and message identification number (MID) value of a message to be transmitted to the history buffer. (TC) is stored together with the duplicate message processing method in the terminal. In the message duplication transmission method in a mobile communication network applied to a mobile communication system, The maximum number of transmissions (MAX_TRY_NUM) indicating the maximum number of transmissions from the mobile communication network to the terminal, the period of retrieving the message from the information provider for cell broadcasting (CB), the period of the message transmitted for each service range, and the importance of the message to be transmitted. Setting in accordance with the first step; A second step of analyzing a message to be transmitted and setting a value MAX_TRY_NUM indicating a maximum number of transmissions to a depth N of a history buffer of the terminal in a corresponding service range; And Within a range in which the depth N of the history buffer of the terminal is greater than zero (0), the depth N of the history buffer of the terminal is sequentially decreased one by one to send the message to the terminal. Third step to transmit Duplicate message transmission method in a mobile communication network comprising a. In the message duplication transmission method in a mobile communication network applied to a mobile communication system, A first step of providing a broadcast buffer in the mobile communication network with a history buffer in which a transmission counter (TC), a service range number (SCN), and a message identification number (MID) in which the number of transmissions of a message to be transmitted from the mobile communication network are transmitted are stored; A second step of the broadcast server generating a broadcast message; A third step of the broadcast server searching the history buffer to compare the number of retransmissions with the transmission counter to determine whether to transmit the broadcast message; And According to the comparison result of the third step, if the transmission counter TC is larger than the number of retransmissions, the message transmission is canceled. If the transmission counter TC is not large, the broadcast message is transmitted to the terminal and the transmission counter TC is set to one. 4th step increasing Duplicate message transmission method in a mobile communication network comprising a. The method according to claim 5 or 6, The history buffer, In storing a pair of SCN and MID value, if it is not stored message ID (MID) value (i.e. new message not remembered), it can be stored. If the space is empty, and if there is no space to store the oldest and erased in place, the message duplication transmission method in the mobile communication network, characterized in that for managing the message identification number (MID) for each service range. The method according to claim 5 or 6, The history buffer, In storing a pair of SCN and MID value, if it is not stored message ID (MID) value (i.e. new message not remembered), it can be stored. If the space is empty, if there is no space to store the oldest and erased in place, but the entire memory space management method characterized in that it manages as a pool. In a mobile communication system having a processor, A first function of storing, by a terminal, a pair of a service range number (SCN) and a message identification number (MID) value of a first message received from a mobile communication network in its history buffer; When the second message is received by the terminal, the terminal analyzes the field of the second message to search the history buffer, and the service range number (SC) of the first message and the second message in the history buffer. A second function of comparing message identification numbers (MIDs); And A third function of the terminal considering and disregarding the second message matching the service range number SCN and the message identification number MID of the first message as a duplicate received message according to a comparison result of the second function; A computer-readable recording medium having recorded thereon a program for realizing this. In a mobile communication system having a processor, The maximum number of transmissions (MAX_TRY_NUM) indicating the maximum number of transmissions from a mobile communication network to a terminal is determined based on the frequency of obtaining a message from an information provider for cell broadcasting (CB), the frequency of messages transmitted by service range, and the importance of a message to be transmitted. According to the first function; A second function of analyzing a message to be transmitted and setting a value MAX_TRY_NUM indicating a maximum number of transmissions to a depth N of a history buffer of the terminal in a corresponding service range; And Within a range in which the depth N of the history buffer of the terminal is greater than zero (0), the depth N of the history buffer of the terminal is sequentially decreased one by one to send the message to the terminal. 3rd function to transmit A computer-readable recording medium having recorded thereon a program for realizing this. In a mobile communication system having a processor, A first function of providing a history buffer in which a transmission counter (TC), a service range number (SCN), and a message identification number (MID) in which a transmission frequency of a message to be transmitted from a mobile communication network to a terminal is stored, to a broadcast server in the mobile communication network; A second function of the broadcast server generating a broadcast message; A third function of the broadcast server searching the history buffer to compare the number of retransmissions with the transmission counter to determine whether to transmit the broadcast message; And According to the comparison result of the third function, if the transmission counter TC is larger than the number of retransmissions, the message transmission is canceled. If the transmission counter TC is not large, the broadcast message is transmitted to the terminal and the transmission counter TC is set to one. 4th function to increase A computer-readable recording medium having recorded thereon a program for realizing this.