KR100603442B1 - Short Message Transmission Method in Wireless Communication Terminal - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for transmitting a short message in a wireless communication terminal.

2. The technical problem to be solved by the invention

In the present invention, by checking a flag indicating whether a short message is transmitted (CDMA SMS Sned Flag) when transmitting a short message in the wireless communication terminal, the short message transmission information due to the change of the operation mode during the short message transmission and resulting short message The purpose of the present invention is to provide a method for transmitting a short message in a wireless communication terminal to prevent a message transmission failure.

3. Summary of the Solution of the Invention

According to an aspect of the present invention, there is provided a method of transmitting a short message in a wireless communication terminal, the wireless communication terminal setting a short message transmission indication flag to TRUE when transmitting a short message; Checking whether the wireless communication terminal has received a successful acknowledgment (ACK) of the short message within a preset time; Setting the short message transmission indication flag to FALSE when the wireless communication terminal receives the transmission success response of the short message as a result of the checking; Maintaining the state of the short message transmission indication flag as the wireless communication terminal does not receive a successful response of the short message; And repeatedly transmitting, by the wireless communication terminal, the short message until the state of the transmission indication flag of the short message is FALSE.

4. Important uses of the invention

The present invention is used in a wireless communication terminal.

Wireless communication terminal, short message service (SMS), code division multiple access (CDMA), analog method (AMPS: Advanced Mobile Phone System), operation mode switching, flag check

Description

Method for transmitting short message in wireless communication terminal {Method For Transmitting Short Message In Wireless Communication Terminal}             

1 is a configuration diagram of an embodiment of a wireless communication system to which the present invention is applied;

2 is a flowchart illustrating a method of transmitting a short message in a wireless communication terminal according to the present invention.

* Explanation of symbols on the main parts of the drawing

11,18: wireless communication terminal 12: base station

13: exchange office 14: location register

15: Short Message Center 16: Short Message Service Server

17: Cell Broadcasting Center

The present invention relates to a method for transmitting a short message in a wireless communication terminal, and more particularly, by checking a CDMA SMS Sned Flag indicating whether a short message is transmitted when transmitting a short message in a wireless communication terminal. The present invention relates to a method for transmitting a short message in a wireless communication terminal for preventing a short message transmission information from being lost due to a change in an operation mode and a failure of the short message transmission.

In the present invention, a wireless communication terminal is a mobile communication terminal, a personal mobile communication terminal (PCS), a personal digital terminal (PDA), a smart phone, a next generation mobile communication terminal (IMT-2000), wireless communication while carrying an individual such as a wireless LAN terminal Say this is possible terminal.

Short Message Service (SMS) refers to a text service that allows users of wireless communication terminals to send and receive short sentences of about 40 characters without additional equipment. The short message service (SMS) is being used more and more because of the rapid spread of wireless communication terminals, the population of the service is rapidly increasing in proportion to it.

In general, the user of the wireless communication terminal transmits a reply number and a message between the wireless communication terminals by using a short message service (SMS), receives weather forecasts, news, stock information, and the like through the Internet. You can send and receive e-mail, and you can receive various information retrieval services necessary for daily life.

On the other hand, short messages transmitted by SMS (Short Message Service) are transmitted through a paging channel or an access channel when the length is short and are transmitted through a traffic channel when the length is short. Each protocol stack should be implemented in station and short message center. At this time, the base station is responsible for the relay (relay) between the wireless communication terminal and the short message center in the middle, the base station that the short message is currently responsible for the service even in the situation of handoff by such a relay (relay) function Forwarded to ensure successful short message transmission.

However, if the operation mode is switched while the wireless communication terminal transmits the short message, the user thinks that the short message has been transmitted, but in reality, it may not be properly transmitted.

That is, when the wireless communication terminal is handed off to the AMPS (Advanced Mobile Phone System) mode, which is an analog cellular method, while transmitting a short message in a digital code division multiple access (CDMA) mode, the wireless communication terminal is AMPS. Since the transition from the mode to the idle state (Idle State), the fact that the short message was being transmitted previously was lost and there was a problem that the short message could not be successfully transmitted.

The present invention has been proposed to solve the above problems, by checking a flag indicating whether to send a short message (CDMA SMS Sned Flag) when transmitting a short message in the wireless communication terminal, changing the operation mode during the short message transmission It is an object of the present invention to provide a method for transmitting a short message in a wireless communication terminal to prevent the loss of short message transmission information due to the short message transmission failure.

According to another aspect of the present invention, there is provided a method of transmitting a short message in a wireless communication terminal, the wireless communication terminal setting a short message transmission indication flag to TRUE when transmitting a short message; Checking whether the wireless communication terminal has received a successful acknowledgment (ACK) of the short message within a preset time; Setting the short message transmission indication flag to FALSE when the wireless communication terminal receives the transmission success response of the short message as a result of the checking; Maintaining the state of the short message transmission indication flag as the wireless communication terminal does not receive a successful response of the short message; And repeatedly transmitting, by the wireless communication terminal, the short message until the state of the transmission indication flag of the short message is FALSE.

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 a configuration diagram of an embodiment of a wireless communication system to which the present invention is applied.

As shown in FIG. 1, a wireless communication system to which the present invention is applied includes a wireless communication terminal (MS) 11 and 18 having a short message transmission / reception function, and the wireless communication terminal (MS) (mobile station) ( 11, 18, and a wireless communication terminal 11 through a base station (BS) 12 and a base station 12 for wirelessly connecting to a mobile switching center (MSC) 13 and a wired connection. 18 transmits the short message received from the short message center (SMC) 15 and the short message received from the short message center 15 through the base station 12. MSC 13 for transmission to 11 and 18, manage basic data and additional service data, subscriber authentication related information, operation data, etc. for call processing of wireless subscribers, and track subscriber's location in real time To provide call connectivity between base stations Home Location Register (HLR) (14), Short Message Center (SMC) (15) for assigning (routing) short message transmission paths according to the destination phone number of short messages, and various interworking with external networks. A short message service server (SMS Server) 16 for executing an application program for an additional service, and a cell broadcasting center (CBC) 17 for providing a broadcast type service using a short message service; Include.

At this time, both the short message transmitted wirelessly from the wireless communication terminals 11 and 18 through the base station 12 or the short message transmitted using the Internet Protocol (IP) from the outside are short message center (SMC) 15. Is delivered to. The short message center (SMC) 15 reads the location information of the wireless communication terminal corresponding to the destination phone number of the received short message from the location register (HLR) 14 and sends the short message to the corresponding exchange station 13. To pass. Then, the switching center 13 transmits a short message to the base station 12 via the base station controller (not shown). Then, the base station 12 transmits the received short message to the corresponding wireless communication terminal using a paging channel or a forward traffic channel according to its length.

Meanwhile, in the present invention, in order to solve the problem that the short message transmission information is lost when the operation mode is changed during the short message transmission, the wireless communication terminals 11 and 18 indicate whether the short message is transmitted (CDMA SMS Sned Flag). And an ACK message for determining whether the short message has been successfully transmitted, and a timer for indicating a time for waiting for the ACK message. The overall process will be described with reference to FIG. 2.

2 is a flowchart illustrating a method of transmitting a short message in a wireless communication terminal according to the present invention.

First, the wireless communication terminals 11 and 18 transmit a short message in response to a request from a user in a digital code division multiple access (CDMA) mode (201). In this case, the wireless communication terminals 11 and 18 set and transmit a reply option of the short message service teleservice layer in a protocol stack implemented for short message service (SMS).

The wireless communication terminals 11 and 18 set the short message transmission indication flag to TRUE and drive the response timer (202). If the transmission success response (ACK) is received before the response timer expires (203, 204), the short message transmission indication flag is initialized to FALSE, and the response timer is initialized (205). .

On the other hand, if the wireless communication terminal does not receive a transmission success response (ACK) until the response timer expires (e.g., from digital CDMA mode to analog AMPS mode), the short message is received. Retransmit (206).

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. It is not limited by the drawings.

As described above, the present invention checks a flag indicating whether a short message is transmitted when the short message is transmitted by the wireless communication terminal, so that the short message transmission information is lost even if the operation mode is changed during the short message transmission. As a result, the short message transmission failure can be prevented.

Claims (2)

In the method of transmitting a short message in a wireless communication terminal, Setting, by the wireless communication terminal, a short message transmission indication flag to TRUE when the short message is transmitted; Checking whether the wireless communication terminal has received a successful acknowledgment (ACK) of the short message within a preset time; Setting the short message transmission indication flag to FALSE when the wireless communication terminal receives the transmission success response of the short message as a result of the checking; Maintaining the state of the short message transmission indication flag as the wireless communication terminal does not receive a successful response of the short message; And The wireless communication terminal repeatedly transmitting the short message until the state of the transmission indication flag of the short message is FALSE Short message transmission method in a wireless communication terminal comprising a. The method of claim 1, When sending the short message, Short message in a wireless communication terminal, characterized in that for transmitting a short message by setting (reply option) of the short message service teleservice layer (SMS Teleservice Layer) according to a request from the user How to send a message.

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