KR20090047086A - Method and apparatus for correcting error of the received message in terminal - Google Patents

Abstract

The present invention relates to a received message error correction method and apparatus of a terminal. According to the present invention, even when an error occurs in a received message, the received message is restored through a header restoration process of the received message and / or confirmation of specific information included in the received message, rather than discarding the received message. By performing the procedure, even if the network environment is poor, it is possible to increase the message reception rate of the terminal.

Description

METHOD AND APPARATUS FOR CORRECTING ERROR OF THE RECEIVED MESSAGE IN TERMINAL}

The present invention relates to a received message error correction method of a terminal and an error correction apparatus of a terminal which enables such error correction.

In general, the terminal refers to a device having at least one voice / video call function, an information input / output function, and a data storage function. Here, the terminal may be divided into a mobile type and a fixed type according to mobility, and the mobile terminal may be divided into a portable type and a stationary type according to whether the user is portable. In addition, the terminal may be referred to by other names such as a mobile station (MS), a user equipment (UE), etc. according to a communication scheme.

Meanwhile, the terminal receives various signals from the base station (or Node B) through the downlink. As such, there is a paging message as a signal for the base station to establish a call with the terminal among the signals received by the terminal from the base station. Specifically, the base station delivers a "General Paging Message" or "Slotted Paging Message" through a paging channel (PCH) for call setup with the terminal. In addition, the base station may transmit various system overhead information and a message for a specific terminal using such a paging channel.

The terminal receiving the paging message may detect whether the received message is an error. In this case, the CRC (Cyclic Redundancy Check) method is most widely used as an error detection method. That is, the terminal checks the received paging message for an error according to the CRC method, and if there is no error in the received message, performs the appropriate hand signal processing such as receiving an SMS according to the paging message. However, if there is an error in the CRC check result of the paging message received from the terminal, the received message is discarded. Accordingly, there is a problem that the base station is difficult to establish a call with the terminal in the MP area (area of poor network environment).

In order to solve the above problems, the present invention provides a method and apparatus for correcting an error of an error received paging message in order to increase the probability that the base station succeeds in establishing a call with the terminal even in a poor network environment. There is a purpose.

In addition, the present invention is to provide a method and apparatus for correcting an error of a received message by the terminal itself for various messages as well as the above-described paging message.

One aspect of the present invention for solving the above problems is to provide a method for the terminal to correct the error occurred in the received message. According to an exemplary embodiment of the present invention, there is provided a method of correcting a received message error of a terminal, detecting whether an received message is an error, removing a header of the received message if there is an error, and removing the header. If there is no error in the received message, restoring the header of the received message using previously stored error free header information.

In a specific embodiment for this, the header restoring step includes re-detecting whether the received message from which the header has been removed is an error, and if there is no error in the received message from which the header is removed as a result of the error detection again. And restoring a header of the received message by using the previously stored error free header information. That is, the method removes the header in which the error occurs, checks the body of the message from which the header is removed, and restores the header of the received message if there is no error.

In another specific embodiment, the header restoring step includes: restoring a header of the received message by using the prestored error-free header information, and redetecting whether the received message in which the header is restored is an error; If there is no error in the received message has been restored may include the step of performing a hand signal processing for the information of the received message, the header is restored, that is, remove the header in error, and instead of the removed header After restoring the header using error-free header information, a method of restoring an error of the received message is performed by checking whether the header is an error message.

In this case, the previously stored error free header information may be obtained from the header information of the previously received message without an error, and if the header information of the previously received message includes information indicating the number of message reception, etc., it is appropriately increased and used. It may be.

Meanwhile, in a preferred embodiment of the present invention, when the received message is a paging message, an error recovery method is provided for a case other than when an error occurs due to a header of the paging message.

That is, in one preferred embodiment of the present invention, in the case of rechecking whether or not an error of a headerless message is detected in a state in which an error header is removed in the above-described embodiments, an error result redetection result of the received message from which the header is removed is error. If there is, performing the bit matching with the at least one of the unique identification information of the terminal and the information indicating a predetermined service type of the received message from which the header is removed, and the reception using the information matching the bit matching result The message may be set to further include restoring the message.

In addition, as described above, when the error header is removed and the error message is reconfirmed using the message in which the header is recovered using the error free header information, the error message redetection of the received message in which the header is restored is detected. If there is an error in the result, performing the bit matching with the at least one of the unique identification information of the terminal and the information indicating a predetermined service type of the received message, the header is restored, and using the information matched as a result of the bit matching The method may further include restoring the received message.

Meanwhile, according to another embodiment of the present invention, when the received message is a paging message, the terminal detects whether an error of the received paging message is detected, and if there is an error, the terminal provides a method of correcting the error of the received paging message. . In the paging message error correction method according to the above embodiment, performing a bit matching with the at least one of the unique identification information of the terminal and information indicating a predetermined service type, and the bit matching Restoring the received paging message using the result matching information.

In this case, the bit matching step may include determining whether the received paging message includes information matching the unique identification information of the terminal, and information in which the received paging message matches the unique identification information of the terminal. If includes, it may include determining whether the received paging message includes information indicating the predetermined service type.

In addition, another aspect of the present invention for solving the above problems is to provide an apparatus for the terminal to correct the error of the received message. Accordingly, an apparatus for performing error correction of a received message in a terminal according to an embodiment of the present invention includes an error detection module for detecting whether an error of the received message is present, and the error detection module determined to have an error. And a header processing module for removing a header of a received message and restoring a header of the received message using previously stored error free header information when there is no error in the received message from which the header is removed.

In this case, in the specific operation method, the received message from which the header is removed by the header processing module is redetected by the error detection module, and when there is no error in the received message from which the header is removed, the header The processing module may be configured to restore the header of the received message. Alternatively, the received message whose header is restored by the header processing module may be redetected by the error detection module to detect an error, and the header may be restored. If there is no error in the received message, the header processing module may be configured to deliver the received message whose header is restored to a signal processing module for hand signal processing for the received message information.

Preferably, the above-described reception message error correction apparatus of the terminal may further include a storage module for storing the previously received message without an error, and the header processing module stores the previously stored error-free header information in the storage module. It may be obtained from header information of a previously received message without the stored error.

In addition, when the received message is a paging message, preferred embodiments of the present invention will be described. As such, when the received message is a paging message, the apparatus for correcting a received message error according to an exemplary embodiment of the present invention performs bit matching on the received message with at least one of unique identification information of the terminal and information indicating a predetermined service type. And a message reconstruction module for restoring the received message by using a bit matching module and information matching the bit matching result of the bit matching module, wherein the bit matching module includes the received message from which the header is removed. If there is an error in the bit matching may be set to perform.

In addition, according to another embodiment of the present invention, an error correction apparatus for a paging message error of a terminal for correcting an error of the paging message when there is an error in the received paging message is proposed. That is, the paging message error correction apparatus according to an embodiment of the present invention, the error detection module for detecting whether the received paging message is an error, the paging message of the information identifying the unique identification information and the predetermined service type of the terminal A bit matching module for performing bit matching with at least one, and a message restoring module for restoring the paging message using information matched as a result of the bit matching in the bit matching module. Is set to perform the bit matching when the error detection module determines that there is an error in the paging message.

In this case, it is determined whether the received paging message includes information matching the unique identification information of the terminal, and if the received paging message includes information matching the unique identification information of the terminal, the received The paging message may be configured to determine whether the paging message includes information indicating the predetermined service type.

The effects of the error correction method and apparatus for receiving a message according to the present invention described above are as follows.

First, even in a poor network environment, the base station can increase the probability of successful call setup with the terminal.

Second, the present invention provides a method and apparatus for correcting an error of a received message by the terminal itself for various messages as well as the above-described paging message. However, in the case of the paging message, even if the error of the received message is caused by any cause other than the header, it is possible to efficiently correct the error of the paging message.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, a method and apparatus for correcting a reception message error of a terminal according to the present invention will be described in more detail with reference to the accompanying drawings. In addition, the detailed description thereof will be omitted for the known technology which is considered to blur the gist of the present invention.

The terminal described in the present specification includes a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), and a navigation device. , Digital camera, MP3P (MPEG layer 3 Player) and the like. Of course, the terminal to which the present invention is applicable is not limited to the above-described type, and it is natural that the terminal may include any user device capable of receiving a message from the base station through downlink and detecting whether the received message is in error.

Hereinafter, referring to FIG. 1, a process in which a terminal related to the present invention receives a paging message to detect an error and performs signal processing accordingly will be described in more detail. 1 is a flowchart illustrating a method in which a general terminal receives a paging message and performs signal processing.

Specifically, in step S101, the terminal receives a paging message from the base station. The received paging message includes a header including a message sequence number, acknowledgment request indication information, acknowledgment sequence number, and the like, and a body other than the header. body) may be configured. The body portion of the paging message may include unique identification information for identifying the terminal, service type information for indicating the type of service to be set through the corresponding paging message, and the like.

In the case of the code division multiple access (CDMA) system according to the 3rd Generation Partnership Project 2 (3GPP2) standard, the International Mobile Station Identity (ISMI) is used as a unique 15-digit identification number assigned to the mobile terminal at the time of service subscription of each terminal. Can be. In addition, in the CDMA system, the above-described service type information may be inserted and transmitted in a service option field (SERVICE_OPTION field) in a general paging message. The service options that may be used include voice and rotation data. ), A specific service corresponding to a paging reason received from an upper layer such as packet data is possible.

The terminal receiving the paging message may calculate the CRC of the paging message received in step S102, and detect whether an error is detected in step S103 by using the calculated CRC. In this case, if an error is not detected in the received paging message, the process proceeds to step S104 whereby the terminal delivers the received paging message to a higher layer, and then can perform appropriate hand signal processing according to the information of the paging message. have.

However, if there is an error in the received message as a result of detecting whether an error of the paging message received through the CRC method in step S103, the existing communication method discards the received paging message and does not perform a special message recovery procedure ( S105). This makes call setup difficult in areas with poor network conditions.

Accordingly, in the present invention, when there is an error in the received paging message as in step S105 described above, it is proposed to perform a process of correcting the error of the received paging message without immediately discarding the received paging message. To this end, the present invention first looks at the cause of the error in the received message in detail as described above, and then proposes a method of correcting the error of the received message for each cause. In this case, the case where the received message is the above-described paging message will be mainly described, but it is not limited thereto.

2 is a diagram for explaining a cause of an error in a received message.

Specifically, Fig. 2A shows an example in which an error occurs in the header of the received message. As such, even if an error occurs only in the header portion of the received message, when the general terminal described above with reference to FIG. 1 performs error detection through a CRC method, the received message is determined to be discarded by determining that an error has occurred in the entire received message. . Accordingly, in the first embodiment of the present invention, when an error occurs in the header of the received message, a method of correcting an error occurring in the message after removing the header in which the error occurs and separately checking whether an error in the body part is performed It proposes, and will be described in detail below.

FIG. 2B illustrates an example in which an error occurs in a body part of a received message, specifically, a paging message. That is, FIG. 2B illustrates a case in which the received paging message is determined to be in error as a whole, including the bit (s) in which the body portion of the received paging message is in error. In addition, (c) of FIG. 2 illustrates a case in which the terminal determines that the received paging message has an error as a result of receiving the received paging message shifted from the normal reception time.

However, as described above, the paging message is a message transmitted by the base station including unique identification information and / or service option information of the terminal to establish a call with the terminal. Therefore, even when an error occurs in some body parts other than the unique identification information and / or the service option information of the terminal as shown in FIG. 2 (b), the unique identification information and / or the service option information of the terminal of the corresponding message are not included. By individually checking it is possible to recover the received paging message. Therefore, in the second embodiment of the present invention, when an error occurs in the received paging message as shown in (b) and (c) of FIG. 2, the terminal unique identification information of the received paging message (for example, The present invention proposes a method for correcting an error of a received paging message by individually checking the same IMSI) and / or service option information, which will be described in more detail below.

Hereinafter, the 1st Embodiment and 2nd Embodiment of this invention mentioned above are demonstrated concretely. Each embodiment may be practiced independently or in combination with each other. In particular, the embodiment which combines the 1st Embodiment and 2nd Embodiment of this invention mentioned above is demonstrated as 3rd Embodiment of this invention below.

<First Embodiment-Error Correction Method by Header of Receive Message>

As described above, in the first embodiment of the present invention, as a result of the terminal detecting whether an error is received through the CRC or the like in the received message, the reason for determining that there is an error is as shown in FIG. This is to handle the case where there is an error in the header.

In the present embodiment, the terminal detects an error of a received message and proposes to remove the header having an error if there is an error. That is, instead of determining that the entire received message is in error due to an error header, it is checked whether there is an error separately in the body part of the received message from which the header is removed, and if there is no error, the previously stored error-free header information is checked. By restoring the header of the received message, a method for correcting an error is proposed. In this case, the previously stored error-free header information as described above may be obtained from the header information of the previously received message without an error. When the above-described paging message is described, for example, the header information of the previously received paging message without error is described. After the message sequence number and the like are appropriately increased according to the number of receptions, the paging message can be restored by inserting the error-free header information thus generated into the paging message from which the header is removed. Such an embodiment will be described in more detail with reference to the drawings below.

3 is a flowchart for explaining a method for correcting an error in a received message according to the first embodiment of the present invention.

The method according to FIG. 3 will be described at each step. First, in step S301, the terminal receives a message transmitted through the downlink from the base station. Accordingly, the terminal calculates the CRC of the received message to check whether the received message is error in step S302, and checks whether the calculated CRC matches the CRC information of the received message in step S303.

In the present embodiment, if it is determined that there is no error in the received message as a result of such a CRC check, it is proposed to include receiving the received message to a higher layer (S309) and storing the received message before performing proper hand signal processing. (S304). As such, header information of a message received without error, in particular, a message received without error, may be used to recover a message in which an error has occurred in the header part.

On the other hand, if there is an error in the received message as a result of the CRC check in step S303, in this embodiment, the header of the received message is removed in step S305. That is, when there is no error in the body part in the message where an error occurs due to the header, the information contained in the body part is to be recovered using the header information of the previously received message without an error. To this end, in step S306, the CRC is additionally recalculated for the received message from which the header is removed in step S305. Accordingly, in step S307 it is checked whether there is an error in the body portion of the received message by using the recalculated CRC value. If there is still an error in the received message as a result of the CRC recheck in step S307, the received message may be regarded as an error in a part other than the header part. In this case, when the occasional message is a paging message, in the present invention, bit matching using terminal-specific identification information and / or service option information on the message body part according to the method according to the second embodiment of the present invention described below. The process may be performed to acquire necessary information, or the received message may be discarded as in the prior art.

On the other hand, when the first embodiment of the present invention is described again, when there is no error in the received message as a result of the CRC recheck in step S307, that is, when there is no error in the body part of the received message, the error-free header information stored in step S304 is used. By restoring the header of the received message (S308). In this case, the header information used for message recovery may use the header of the previously received error-free message as it is, but is properly adjusted according to information that the terminal can acquire itself, such as the number of message receptions, as in the above-described paging message. It is preferable to use header information.

The received message recovered in this way is transferred to the upper layer in step S309, and thus it is possible to perform appropriate hand signal processing according to the received message information.

The example described above with reference to FIG. 3 has been described as a method of recovering a message after removing a header and checking whether there is an error in the remaining part when an error occurring in a received message is caused by a header. However, in the first embodiment of the present invention regarding a method for correcting an error due to a header of a received message, a method for recovering a message using an error-free body part of a received message may vary. One modification of the first embodiment of the present invention will be described.

4 is a variant of a method for correcting errors in a received paging message according to a first embodiment of the present invention.

The error correcting method of the received message according to FIG. 4 is basically the method of FIG. 3 except for the execution order of the specific steps for checking whether there is an error in the body part of the received message except the header and the CRC checking algorithm used. Same as the received message error correction method. Therefore, hereinafter, the steps S405 to S408 of FIG. 4 having a difference from the method of FIG. 3 will be described in comparison with FIG. 3 to avoid duplication.

As described in FIG. 3, the terminal receives a message transmitted from the base station (S401), and checks whether an error is performed using the CRC of the received message (S402 and S403). If there is no error as a result of the error checking in step S403, the received message is stored as in the case of FIG. 3 (S404). On the other hand, if there is an error as a result of the error checking in step S403, in step S405, the header of the received message is removed.

This modification proposes to restore the header using the error-free header information stored in step S404 before detecting the error on the received message from which the header has been removed in this way (S406). In step S407, the CRC is recalculated for the CRC recheck on the received message whose header is restored as described above, and in step S408, the CRC error is determined based on the result.

If there is no error in the body part except the header, no error will occur for the entire received message in which the header is restored using the error-free header information as in step S406. In addition, if the process of restoring the header of the received message is performed first, and then the CRC check is performed again with respect to the received message whose header has been restored as in steps S406 and S407, the CRC check is performed again in steps S402 and It may have an advantage that can be performed by the same algorithm as the CRC check in S403.

When there is an error as a result of such CRC recheck, it may be determined that there is an error in the body part of the received message as in the case of FIG. 3, and when the received message is a paging message according to the second embodiment of the present invention described below The message may be recovered through bit matching using unique identification information and / or service option information of the terminal, or the received message may be discarded as in the prior art.

However, referring to FIG. 4, if there is no error as a result of the CRC rechecking in step S408, the error generated in the received message may be determined to be corrected in steps S405 and S406, and the corresponding message may be delivered to a higher layer (S409). . Accordingly, the upper layer can perform appropriate hand signal processing.

As described above, in the first embodiment of the present invention, an error occurring in the received message is generated by the header, and any type of method is used as long as the error of the received message can be recovered when there is no error in the body part of the received message. Can be. In addition, as described above, in the first embodiment of the present invention, the received message may be any message composed of a header and a body as well as a paging message.

Second Embodiment Error Correction Method by Obtaining Specific Information of Receive Message Individually

As described above, in the second embodiment of the present invention, as a result of detecting whether an error has occurred in the received message through CRC or the like, the reason for determining that there is an error is as shown in FIG. 2B or 2C. As described above, the present invention relates to a method of correcting an error by acquiring specific information individually about an error in a body part of a received message or when a message is shifted and received.

As such, there may be various methods for recovering a message by individually checking specific information. However, in the present embodiment, when a paging message is received, the received message may be individually received through bit matching with terminal unique identification information and / or service option information. This section describes how to correct errors in the received paging message.

5 is a flowchart illustrating a method of recovering a received message according to the second embodiment of the present invention when the received message is a paging message.

First, in step 501, the terminal receives a paging message transmitted through the paging channel (PCH) from the base station. Thereafter, in step S502, a CRC of the received paging message is calculated to check whether the received paging message is in an error state, and the CRC check is performed in step S503 using the result. If there is no error in the received paging message as a result of the CRC check in step S503, the terminal transmits the received paging message to a higher layer (S504), and accordingly appropriate hand signal processing such as setting up a call between the base station and the terminal accordingly. Can be performed.

Meanwhile, when an error occurs in the received paging message as a result of the determination in step S503, bit matching is performed on the received paging message with the unique identification information (for example, IMSI) of the terminal. Even if there is an error in the received paging message, the IMSI and / or service option information in the paging message may be included without error, as shown in FIGS. 2B and 2C. When a bit stream matching is found as a result of bit matching of the IMSI, it can be confirmed that the paging message is a paging message transmitted for call establishment with the corresponding terminal.

In addition, when there is a bit stream that matches between the received paging message and the IMSI as described above, in step S505, the received paging message may additionally perform bit matching with information indicating a specific service type, that is, each service option information. Can be. As described above, in the body of the paging message, not only the unique identification information of the terminal intending to set up a call, but also a service indicating whether the base station wants to set up with the terminal as a voice service, a rotation data service, or a packet data service. Option information may be included, and accordingly, bit matching with service option information is additionally performed to confirm a service type to be set through a corresponding paging message. However, service option information is not an essential element in the paging message. For example, in a specific system, when a service to be set through a paging message is a voice service, a paging message may be set without setting a service option field value. Therefore, bit matching between the received message and the service option field information in step S505 is not an essential step.

As described above, with respect to the result of performing bit matching for acquiring specific information, in step S506, it is determined whether or not there is matching information and the content of matching information. If there is no matching information as a result of the bit matching in step S505, in particular, when a matching bit stream cannot be found as a result of comparing the paging message with the IMSI value of the corresponding terminal, the received paging message cannot be recovered. Can be determined to have occurred, and thus the message can be discarded as in step S507.

On the other hand, when the determination result of step S506 determines that the received paging message contains information that matches the information on which bit matching is performed in step S505, in step S508, the received paging message is restored using the matched information. Suggest. The recovered paging message is then transferred to the upper layer through step S504, whereby an appropriate hand signal processing procedure can be performed. For example, if there is a bit stream matching the IMSI information of the terminal in the paging message received as a result of the bit matching in step S505, and if the service type of the received paging message indicates a voice service, the upper layer of the terminal is thus connected to the base station. A procedure for voice service can be performed.

<Third Embodiment-Binding Example>

As described above, the first embodiment of the present invention provides a method for correcting an error of a received message when an error occurring in the received message is caused by a header. In the second embodiment of the present invention, a received message, particularly a paging message, specifies specific information. It is proposed a method of correcting the error of the received message by individually checking whether or not included. The above-described embodiments may be implemented for error correction of received messages, respectively, but the third embodiments of the present invention combine the first and second embodiments to mutually correct the error of the received message more efficiently. I would like to suggest a method.

6 is a flowchart for explaining a method for correcting an error in a received message according to a third embodiment of the present invention.

Specifically, FIG. 6 illustrates a method for correcting a received message error due to a header as in FIG. 3 according to the first embodiment of the present invention when the received message is a paging message, and FIG. 5 according to the second embodiment of the present invention. As shown in the figure, a combination of error correction methods through checking specific information is illustrated.

That is, the terminal receives a paging message transmitted through the paging channel (PCH) from the base station (S601), and checks the error according to the CRC scheme (S602, S603). If there is no error in the received paging message, in the third embodiment of the present invention, the received message is stored as in the first embodiment (S604), and the information thus stored is previously received header information without error. Can be used to obtain.

On the other hand, if there is an error in the paging message received as a result of the determination in step S603, the terminal removes the header of the message (S606). If an error in the received paging message is caused by the header, this is to recover the error. Thereafter, the terminal recalculates the CRC for the paging message from which the header is removed (S607), and performs a CRC check again using the same (S608). If it is determined that there is no error in the paging message from which the header is removed, the terminal may recover the header by using the stored error information without error stored in step S604 (S609). Such header recovery may be performed using a header of a form properly performed in consideration of the number of paging message receptions as described above. As described above, the header-restored paging message may be transferred to a higher layer (S605), and may undergo an appropriate hand signal processing.

On the other hand, if it is determined that there is an error in the paging message from which the header is removed as a result of the determination in step S608, it may be determined that there is an error in the body portion of the received paging message. Accordingly, in step S610, whether or not the corresponding information is individually checked through bit matching with the paging message from which the header is removed and the unique identification information and / or service option field of the terminal (S610). In this case, bit matching between the received paging message and the service option field information may be omitted.

Thereafter, the terminal checks the bit information matched as a result of the bit matching (S611). If it is determined that the received paging message does not include information matching the unique identification information and / or service option field information of the terminal, the terminal determines that the received paging message has an unrecoverable error. In step S612, the message may be discarded. On the other hand, if a matching bit stream is found, the paging message may be recovered using this information in step S613 (S613). The paging message recovered in this manner is also delivered to the upper layer as in step S605 to perform the appropriate hand signal processing procedure.

7 is a flowchart for explaining another method of correcting an error in a received message according to a third embodiment of the present invention.

Specifically, FIG. 7 illustrates a method for correcting a received message error due to a header as in FIG. 4 according to the first embodiment of the present invention when the received message is a paging message, and FIG. 5 according to the second embodiment of the present invention. As shown in the figure, a combination of error correction methods through checking specific information is illustrated.

That is, the terminal receives a paging message transmitted through the paging channel (PCH) from the base station (S701), and checks the error according to the CRC scheme (S702, S703). If there is no error in the received paging message, in the third embodiment of the present invention, the received message is stored as in the first embodiment (S704), and the information thus stored is previously received header information without error. Can be used to obtain.

On the other hand, if there is an error in the received paging message as a result of the determination in step S703, the terminal removes the header of the message (S706). If an error in the received paging message is caused by the header, this is to recover the error. Thereafter, the terminal may recover the header using previously stored header information without error stored in step S704 (S707). Such header recovery may be performed using a header of a form properly performed in consideration of the number of paging message receptions as described above. Thereafter, the terminal recalculates the CRC for the paging message whose header is recovered (S708), and performs a CRC check again using the same (S709). If it is determined that the header has no error in the recovered paging message, the terminal may transmit the recovered paging message to the upper layer (S705) to perform an appropriate hand signal processing procedure.

On the other hand, if it is determined that there is an error in the recovered paging message as a result of the determination of step S709, it may be determined that there is an error in the body portion of the received paging message. Accordingly, in step S710, whether a corresponding paging message and the terminal's unique identification information and / or service option field and bit matching may be individually checked (S710). In this case, bit matching between the received paging message and the service option field information may be omitted.

Thereafter, the terminal checks the matching bit information as a result of the bit matching (S711). If it is determined that the received paging message does not include information matching the unique identification information and / or service option field information of the terminal, the terminal determines that the received paging message has an unrecoverable error. In step S712, the message may be discarded. On the other hand, if a matching bit stream is found, the paging message may be recovered using this information in step S713 (S713). The paging message recovered in this manner is also delivered to the upper layer as in step S705 to perform the appropriate hand signal processing procedure.

In the above, various methods for performing error correction of a received message according to the present invention have been described in terms of methods. Hereinafter, the device configuration of the terminal for performing the error correction method according to each embodiment of the present invention as described above will be described in terms of device.

8 is a schematic block diagram schematically showing, according to a function, a configuration of a terminal and an error correction apparatus of a terminal for performing error correction of a received message according to an embodiment of the present invention.

As shown in FIG. 8, the terminal according to the present embodiment removes a receiving module 801 for receiving a message from a base station, an error detecting module 802 for detecting whether a received message is in error, and a header of the received message. And a header processing module 803 for restoring the header using the previously received header information without an error, and a signal processing module 804 for performing appropriate hand signal processing according to the received message. Can be. In addition, it may further include a storage module 805 for storing the header portion, particularly of the received message without error, so that the header processing module 803 may later obtain error-free header information. In the above-described configurations, the "module" represents a unit configuration for performing each necessary role in performing the error correction algorithm according to the present invention, which may be implemented in hardware, software, or a combination thereof.

Specifically, referring to the operation between the components of FIG. 8, the message received by the receiving module 801 is transferred to the error detecting module 802 and undergoes an error detection procedure using a CRC or the like method. When there is an error in the error detection result received message of the error detection module 802, in one embodiment of the present invention, the received message is removed by passing the received message to the header processing module 803 and the header is removed. The data may be passed back to the error detection module 802 to recheck whether there is an error in the body portion of the received message. If the error detection module 802 examines the received message with the header removed in this way and determines that there is no error, the received message with the header removed is passed back to the header processing module 803, and the header processing module 803 ) May perform a header restoration procedure by using header information of a previously received message without an error stored in the storage module 805. The header-restored message may then be delivered to the signal processing module 804 and subjected to an appropriate hand signal processing procedure.

Meanwhile, in another embodiment of the present invention, the operation of the header processing module 803 and the error detection module 802 are configured to be performed by changing the order of examining whether there is an error in the received message from which the header is removed. Can be. According to the present embodiment, when the error detection module 802 determines whether there is an error as a result of examining the error message received by the receiving module 801, the error detection module 802 delivers the received message to the header processing module 803 to receive it. Remove the header of the message. Thereafter, the header processing module 803 may perform an operation of immediately restoring the header of the received message from which the header has been removed using the previously stored header information without an error stored in the storage module 805.

Then, as described above, the received message whose header is restored may be transmitted to the error detection module 802 to determine whether there is an error in the message itself whose header has been restored. If it is determined that there is no error in the restored message, the error detection module 802 may transfer the message to the signal processing module 804 so that the appropriate hand signal processing may be performed.

According to the present embodiment, as described above, the header processing module 803 simultaneously removes and restores the header, thereby simplifying the message exchange process between the modules.

Meanwhile, when the received message is a paging message, in a preferred embodiment of the present invention, it is determined whether unique identification information and / or service option information of the terminal exists in the body of the received paging message in addition to the configuration shown in FIG. 8. By doing so, we propose a terminal and an error correction apparatus of the terminal including a configuration for performing a procedure for restoring a message.

FIG. 9 is a schematic block diagram schematically illustrating a configuration of a terminal and an error correction apparatus of a terminal for performing error correction of a received paging message when the received message is a paging message according to a preferred embodiment of the present invention. to be.

FIG. 9 further includes a bit matching module 901 connected with the error detection module 802, a bit matching module 901, and a message recovery module 902 connected with the signal processing module 804 compared to the configuration of FIG. 8. Except for the same configuration as in FIG. Therefore, the following description will focus on the configuration added in FIG.

As described above with reference to FIG. 8, an error caused by the header of the received message may be corrected through a header recovery process between the error detection module 802 and the header processing module 803. However, when an error of the received message is in the body other than the header and / or the received message itself is shifted and received, the error of the received message cannot be corrected simply through the above-described header recovery process. The recovered received message is also determined by the error detection module 802 to be in error. When the error is not corrected through the header recovery process as described above, in the present embodiment, the error detection module 802 transfers the message to the bit matching module 901 so that the terminal of the terminal in the message, preferably the paging message, can be sent. Bit matching may be used to determine whether unique identification information (eg, IMSI) and / or service option information indicating a specific service type is included. To this end, in FIG. 9, the bit matching module 901 illustrates input of the received paging message and IMSI and / or service option field information of a corresponding terminal predetermined for bit matching.

The bit matching module 901 checks whether a bit stream matching the IMSI and / or service option field information exists in the received paging message. If a matched bit stream is found, information on the matched bit stream is transmitted to the message recovery module 902, and the message recovery module is a corresponding paging message transmitted to a terminal having the IMSI value. The paging message indicating that the service corresponding to the service option field value is set may be restored. The recovered paging message may then be delivered to the signal processing module 804 and subjected to the appropriate hand signal processing.

Meanwhile, in the above-described embodiment, a configuration for recovering the received paging message by checking whether the received paging message includes the unique identification information of the terminal and / or the service option information indicating the specific service type is included in the received message. Independent of the configuration for correcting errors in the header, it can function as follows:

10 is a schematic block diagram schematically showing a configuration of a terminal and an error correction apparatus of a terminal for performing error correction of a received paging message when the received message is a paging message according to another embodiment of the present invention. It is also.

The terminal according to an embodiment of the present invention shown in FIG. 10 includes a reception module 1001 for receiving a paging message, an error detection module 1002 for detecting whether an error of the received paging message is present, and an error in the received paging message. If present, the bit matching module 1003 for checking whether the received paging message includes the unique identification information of the terminal and / or service option information indicating a specific service type in a bit matching scheme, and the bit matching module. Message recovery module 1004 for restoring the paging message using the information matched according to the bit matching result of (1003). That is, in the embodiment as shown in FIG. 9, the components for restoring the message by individually checking the unique identification information and / or the service option information of the terminal included in the body of the paging message are independently a paging message error of the terminal. It can be configured as a correction device.

The method and apparatus according to each embodiment of the present invention as described above can be implemented entirely in hardware, software, or a combination of both.

According to a hardware implementation, each of the above-described modules may include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), It may be implemented through at least one or more of processors, controllers, micro-controllers, microprocessors, and electrical units for performing functions.

According to the software implementation, the procedure or function in the above-described embodiments may be implemented with a separate software module to perform at least one function or operation. The software code may be implemented by a software application written in a suitable programming language. In addition, the software code may be stored in a suitable storage means and executed by a specific control unit.

In addition, the above-described embodiments have been described mainly in the form applied to the CDMA communication system, the message is received through the base station, the received message may be divided into a header portion and a body portion, the base station is a specific terminal And may be applied in the same manner to any communication system that performs call setup via a paging message.

For example, applicable communication systems include frequency division multiple access (FDMA), time division multiple access (TDMA), and code division multiple access ("FDMA"). CDMA '), Universal Mobile Telecommunications Systems (UMTS) (especially Long Term Evolution (LTE), Global System for Mobile Communications (GSM)), and the like. Can be.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the accompanying drawings. In addition, the above-described embodiments may be configured by selectively combining all or part of the embodiments so that various modifications may be made.

1 is a flowchart illustrating a method in which a general terminal receives a paging message and performs signal processing.

2 is a diagram for explaining a cause of an error in a received message.

3 is a flowchart for explaining a method for correcting an error in a received message according to the first embodiment of the present invention.

4 is a variant of a method for correcting errors in a received paging message according to a first embodiment of the present invention.

5 is a flowchart illustrating a method of recovering a received message according to the second embodiment of the present invention when the received message is a paging message.

6 is a flowchart for explaining a method for correcting an error in a received message according to a third embodiment of the present invention.

7 is a flowchart for explaining another method of correcting an error in a received message according to a third embodiment of the present invention.

8 is a schematic block diagram schematically showing, according to a function, a configuration of a terminal and an error correction apparatus of a terminal for performing error correction of a received message according to an embodiment of the present invention.

9 is a schematic block diagram schematically showing the configuration of an error correction apparatus of a terminal and a terminal for performing error correction of a received paging message when the received message is a paging message according to a preferred embodiment of the present invention. It is also.

10 is a schematic block diagram schematically showing a configuration of a terminal and an error correction apparatus of a terminal for performing error correction of a received paging message when the received message is a paging message according to another embodiment of the present invention. It is also.

Claims (15)

Detecting an error of a received message and removing a header of the received message if there is an error; And And restoring a header of the received message by using previously stored error-free header information when the received message in which the header is removed has no error. The method of claim 1, The header restoration step, Redetecting whether an error of the received message from which the header is removed is detected; And Restoring the header of the received message by using the previously stored error free header information when there is no error in the received message from which the header is removed as a result of the error redetection. . The method of claim 1, The header restoration step, Restoring a header of the received message by using the previously stored error free header information; And Re-detecting whether the received message whose header has been restored is an error, and performing hand signal processing on the information of the received message whose header has been restored when there is no error in the received message whose header has been restored; Method of correcting received message error of terminal. The method of claim 1, The previously stored error free header information is obtained from the header information of the previously received message without an error. The method of claim 2, The received message is a paging message, If there is an error as a result of error detection of the received message from which the header is removed, Performing bit matching on the received message from which the header is removed with at least one of unique identification information of the terminal and information indicating a predetermined service type; And And recovering the received message by using the information matched as a result of the bit matching. The method of claim 3, wherein The received message is a paging message, If there is an error as a result of error detection of the received message in which the header is restored, Performing bit matching with the at least one received message from which the header is restored and at least one of unique identification information of the terminal and information indicating a predetermined service type; And And recovering the received message by using the information matched as a result of the bit matching. In the method for detecting the error of the received paging (paging) message, if there is an error, the terminal corrects the error of the received paging message, Performing bit matching on the received paging message with at least one of unique identification information of the terminal and information indicating a predetermined service type; And Restoring the received paging message using information matched as a result of the bit matching. The method of claim 7, wherein The bit matching step, Determining whether the received paging message includes information matching unique identification information of the terminal; And If the received paging message includes information matching the unique identification information of the terminal, determining whether the received paging message includes information indicating the predetermined service type; How to correct message errors. In the device for performing error correction of the received message in the terminal, An error detection module for detecting whether the received message is in error; And A header for removing headers of the received message determined to have an error in the error detection module, and restoring the header of the received message using previously stored error-free header information when there is no error in the received message from which the header is removed. Receiving message error correction apparatus of a terminal, including a processing module. The method of claim 9, The received message from which the header is removed by the header processing module is redetected whether an error is detected by the error detection module, And if there is no error in the received message from which the header is removed, the header processing module restores the header of the received message. The method of claim 9, The received message whose header is restored by the header processing module is redetected whether or not an error is detected by the error detecting module. If there is no error in the received message in which the header is restored, the header processing module delivers the received message in which the header is restored to a signal processing module for hand signal processing for the received message information. Correction device. The method of claim 9, Further comprising a storage module for storing the received message without an error, And the header processing module obtains the previously stored error free header information from the header information of the previously received message without the error stored in the storage module. The method of claim 9, The received message is a paging message, The reception message error correction device of the terminal, A bit matching module for bit matching the received message with at least one of unique identification information of the terminal and information indicating a predetermined service type; And And a message reconstruction module for reconstructing the received message by using the information matching the bit matching result of the bit matching module. And the bit matching module performs the bit matching when there is an error in the received message from which the header is removed. An apparatus for correcting a paging message error of a terminal for correcting an error of the paging message when there is an error in a received paging message, An error detection module detecting whether an error of the received paging message is detected; A bit matching module configured to perform bit matching with the paging message on at least one of unique identification information of the terminal and information indicating a predetermined service type; And And a message reconstruction module for reconstructing the paging message using information matched as a result of the bit matching in the bit matching module. And the bit matching module performs the bit matching when the error detection module determines that there is an error in the paging message. The method of claim 14, The bit matching module, It is determined whether the received paging message includes information matching the unique identification information of the terminal, and if the received paging message includes information matching the unique identification information of the terminal, the received paging message Determining whether or not includes information indicating the predetermined service type.

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