KR100828322B1 - Retransmission method with state variables in the radio link control layer of the UMTS systems - Google Patents

Abstract

The present invention relates to a retransmission method of data or control information using a state variable in a radio link control layer of a 3GPP asynchronous (UMTS) mobile communication system.

The present invention relates to a process of retransmission by comparing the number of transmissions with a threshold value when transmission of data or control information continuously fails. The transmission number of the data is thresholded because transmission of specific data (RLC PDU) continues to fail. Transmitting, by the transmitting side, a receiving window moving (MRW) command to the receiving side when the transmission of the data transmitted immediately before or larger than the value MaxDAT has failed; When the transmission of the reception window movement command continues to fail and the transmission of the reception window movement command transmitted immediately before the reception window movement command is equal to or greater than the threshold value MaxMRW fails, the transmission side is sent to the reception side. Transmitting a reset command for instructing a reset of the radio link control layer; When the transmission of the reset command continues to fail and the transmission of the reset command transmitted before the reset command, which is equal to or greater than the threshold value MaxRST, fails, the sender reports this to a higher layer. It is characterized by including.

Therefore, according to the present invention, it is possible to implement an efficient and stable system by preventing waste and error of radio resources that may occur when retransmission of data or control information in a UMTS mobile communication system.

Description

Retransmission method with state variables in the radio link control layer of the UMTS systems}             

1 is a structure of a general air interface protocol according to the 3GPP radio access network standards

2 is a diagram illustrating a process of converting RLC SDUs into RLC PDUs by a partitioning and concatenation function;

3 is a flowchart illustrating a retransmission process of an RLC PDU using a state variable VT (DAT).

4 is a flowchart illustrating a retransmission process of information between RLC layers using a conventional state variable.

5 is a flowchart illustrating a retransmission process of a received window movement (MRW) command using a state variable VT (MRW).

6 is a flowchart illustrating a retransmission process of an RLC layer reset command (RST) using a state variable VT (RST).

7 is a flowchart illustrating a retransmission process of an RLC PDU using a state variable VT (DAT) by the proposed method.                 

8 is a flowchart illustrating a retransmission process of information between RLC layers using state variables of the present invention.

9 is a flowchart illustrating a retransmission process of a received window movement (MRW) command using a state variable VT (MRW) according to the proposed method.

10 is a flowchart illustrating a process of retransmitting a reset command (RST) of an RLC layer using a state variable VT (RST) according to the proposed method.

The present invention relates to a method of retransmitting data or control information in a radio link control layer of a 3GPP asynchronous (UMTS) mobile communication system. In particular, the data or control information is caused by continuous transmission failure of data or control information of a radio link control layer. The present invention relates to a method for retransmitting radio link control layer data or control information which prevents a waste of radio resources and errors that may occur when the number of transmissions reaches a threshold.

More specifically, when the transmission of a specific protocol data unit continues to fail and the transmission frequency is equal to or greater than the threshold MaxDAT, the transmitting side transmits a receiving window shift (MRW) command to the receiving side, and the receiving window When the transmission command continues to fail and the number of transmissions is equal to or greater than the threshold value MaxMRW, the transmitting side transmits a reset command to the receiving side to instruct a reset of the radio link control layer, and the transmission of the reset command continues to fail. Retransmission of data and control information in a mobile communication system characterized by reporting to the upper layer when the number of transmissions is equal to or greater than the threshold (MaxRST).

Details of the above will be described in the description of the present invention.

In order to prepare detailed specifications such as 3rd generation GSM network and W-CDMA access technology and terminal based on them, 3rd generation joint projects (TSI of Europe, ETSI of Japan, ARIB / TTC of USA, T1 of USA and TTA of Korea) Partnership Project (hereinafter abbreviated as 3GPP) is a third-generation mobile communication system that can provide multimedia services such as voice, video and data in a wireless environment.

3GPP supports the activities of five Technical Specification Groups (hereinafter abbreviated as TSG) for fast and efficient project operation and technology development, and each TSG has a set of standards related to the assigned area. Responsible for development, approval, and management. Among them, the Radio Access Network (hereinafter, abbreviated as RAN) group aims to define a new radio access network in a third generation mobile communication system, and includes a terminal and a UMTS wireless terrestrial radio access network; Develop specifications for the functionality, requirements and interfaces of the UTRAN.

The TSG-RAN Group is again composed of a Plenary Group and four Working Groups. Working Group 1 (WG1) develops standards for the Physical Layer (WG2), while the second Working Group (WG2) works with the Data Link Layer (2nd Layer) and Network Layer (WG2). Role of the third tier). In addition, the third operation group defines standards for interfaces between base stations, radio network controllers (hereinafter referred to as RNCs), and core networks in the UTRAN, and the fourth operation group relates to radio link performance. Discuss requirements and requirements for radio resource management.

1 shows a structure of a radio interface protocol according to a 3GPP radio access network standard.

The air interface protocol between the user equipment and the UTRAN consists of a physical layer, a data link layer, and a network layer horizontally, and vertically transmits a control plane and data information transmission for signaling. It is divided into User Plane.

More specifically, the control plane includes a radio resource control layer (hereinafter referred to as RRC), a radio link control layer (hereinafter referred to as RLC) and a medium. Medium Access Control Layer (hereinafter referred to as MAC) and Physical Layer (Physical Layer), the user plane in the packet data convergence protocol (hereinafter referred to as PDCP) layer, RLC layer, There is a MAC layer and a physical layer.

The physical layer provides an information transfer service to an upper layer using various wireless transmission technologies. The upper MAC layer is connected through a transport channel, and data between the MAC layer and the physical layer moves through the transport channel. The transport channel is divided into a dedicated transport channel and a common transport channel, respectively, depending on whether the terminal can be used exclusively or shared by multiple terminals.

The MAC layer provides a reassignment service of MAC parameters for allocating and reallocating radio resources. The RLC layer is connected to a logical channel, and various logical channels are provided according to the type of information to be transmitted. In general, a control channel is used for transmitting control plane information, and a traffic channel is used for transmitting user plane information.

The RLC layer provides a radio link establishment and release service. In addition, it performs a segmentation and concatenation function of an RLC Service Data Unit (hereinafter, abbreviated as SDU) from an upper layer of the user plane.

The RLC SDU is sized to fit the processing capacity in the RLC layer and then header information is added to the MAC layer in the form of a Protocol Data Unit (hereinafter, abbreviated as PDU).

The PDCP layer is located above the RLC layer and allows data transmitted through a network protocol such as IPv4 or IPv6 to transmit data in a form suitable for the RLC layer. Also, It reduces unnecessary control information used in the wired network so that it can be efficiently transmitted through the wireless interface. This feature is called Header Compression and can be used to reduce the amount of header information for TCP / IP as an example.

The RRC provides an information broadcast service that broadcasts information to all terminals located in an arbitrary area. It is also in charge of control plane signal processing for control signal exchange in the third layer, and has a function of setting, maintaining and releasing radio resources between the terminal and the UTRAN. In particular, the RRC has a function of setting, maintaining, and releasing a radio bearer, and allocating, relocating, or releasing radio resources required for radio resource access. In this case, the radio bearer refers to a service provided by the second layer for data transmission between the terminal and the UTRAN. That is, one radio bearer is defined as a process of defining the protocol layer and channel characteristics necessary for providing a specific service and setting each specific parameter and operation method.

Hereinafter, the RLC layer will be described in more detail.

The RLC layer performs partitioning and concatenation functions on the RLC SDUs descended from the upper layer, and forms an RLC PDU by adding an RLC header to the configured RLC payload after splitting and concatenating. The header of the RLC PDU may include a serial number, so that the receiver may examine the serial number of the received RLC PDU to detect the lost RLC PDU during transmission, and may request that the transmitter retransmit the PDU.

2 illustrates a process of converting RLC SDUs into RLC PDUs by a partitioning and concatenation function. As shown in FIG. 2, one RLC PDU may include one or more RLC SDUs, and several PDUs may configure one SDU.

The RLC layer has three modes according to a function to be performed, and each of them is a transparent mode, an unacknowledged mode, and an acknowledgment mode.

First, when operating in transparent mode, no header information is added to the RLC SDU from the upper layer. In general, the transparent mode does not use the division and connection of the RLC SDU, but in some cases it is determined whether to use the division and connection function when configuring the radio bearer.

Second, in the non-response mode, retransmission is not supported even if the transmission of the RLC PDU fails. Therefore, even if data is lost or a problem occurs during transmission, the receiving side does not require retransmission and discards related data. Examples of services that can use the non-response mode include a cell broadcast service and a voice over IP.

Finally, when the RLC layer operates in response mode, it supports retransmission when a packet fails. That is, the transmitting side RLC layer receives the status information from the receiving side to determine the success of the transmission and retransmits the RLC PDU that needs retransmission.

The receiving side transmits the status information including the information of the PDUs lost to the transmitting side in a status PDU. In some cases, the status PDU may be transmitted from the transmitting side to the receiving side, in which case the transmitting side sends a receiving window moving command.                         

When the RLC layer operates in response mode, the RLC PDUs are stored in the RLC buffer in order according to the serial information contained in the header. The stored RLC PDUs are delivered to the MAC layer as many as required by the MAC layer, and are basically transmitted in serial number order. Since the first RLC PDUs transmitted from the transmitting RLC layer are transmitted in serial number order, the receiving RLC layer can read the received RLC PDU by observing the received serial number.

For example, if the serial number of the received RLC PDU was # 23, # 24, # 25, # 32, # 34, it can be said that the RLC PDU having the serial numbers of # 26 ~ # 31 and # 33 has been lost. The receiving side reads the serial number of the received RLC PDU, and transmits a status PDU containing positive acknowledgment or negative acknowledgment information to the transmitting side to support the retransmission process of the transmitting side.

In general, the RLC layer of the transmitting side and the receiving side has a transmission window and a receiving window, respectively. The transmission window means a range of RLC PDUs that can be sent at a time by the transmitter, and only PDUs whose serial number is in the transmission window can be transmitted. Similarly, the receiving side can receive only the PDU whose serial number is in the receiving window, and immediately discards the PDU having the serial number outside the receiving window.

The transmitter manages VT (DAT), VT (MRW) and VT (RST) which are state variables related to the data retransmission function.

In the above, VT stands for "Variable for Transmission", DAT stands for "Data", "MRW" stands for "Move Receive Window", and RST stands for "Reset".

Hereinafter, the state variable will be described with reference to the drawings.

3 is a flowchart summarizing a retransmission process of an RLC PDU using a state variable VT (DAT) according to the related art.

First, the RLC PDU is generated, the state variable is set to 0, it is determined whether the transmission condition is satisfied, the information is transmitted, and the state variable is increased by 1, thereby the size of the state variable and the preset threshold value. When comparing the state variable value is greater than the threshold value is to change the transmission and reception settings. (Steps 31, 32, 33, 34, 35, 36).

4 is a flowchart illustrating an RLC PDU retransmission process using a state variable VT (DAT).

The VT (DAT) indicates the number of transmissions of a specific RLC PDU in the transmitting RLC layer, and increases by 1 each time the corresponding RLC PDU is transmitted. At this time, one VT (DAT) exists for each RLC PDU. In order to prevent the retransmission of a particular RLC PDU constantly, if the value becomes equal to or greater than MaxDAT, all SDUs related to the PDU are discarded and a Move Receiving Window (hereinafter referred to as MRW) command is issued. At this time, the MRW instruction is transmitted in the form of a superfield, which is a component of the status PDU sent from the transmitter, and this superfield is called a reception window moving superfield (MRW SUFI). (Steps 41,42,43,44,45,46).

5 is a flowchart illustrating a retransmission process of the MRW command using the state variable VT (MRW).                         

The MRW instruction is sent to the receiving side when the VT (DAT) value is equal to or greater than MaxDAT or when it is necessary to move the receiving window for another reason. At this time, the receiving window command should be set in consideration of all data affected by discarding the corresponding PDU. For example, if one RLC SDU consists of several RLC PDUs, and the VT (DAT) for the first of these PDUs is equal to MaxDAT, then discarding the first PDU will cause the SDU to no longer be valuable as data. Since no RLC PDUs are present, all RLC PDUs containing that SDU must be discarded. At this time, the MRW instruction should include information of all PDUs discarded together.

VT (MRW) means the number of times the MRW command has been sent, and this value increases by one each time the MRW command is sent. After the MRW command is transmitted, the sender starts the related timer Timer_MRW. If the MRW command fails to receive MRW_ACK, which is the acknowledgment information of the MRW command until the timer expires, the sender retransmits the MRW command with the same information.

If VT (MRW) is equal to or larger than MaxMRW, the RLC layer determines that it can no longer perform an MRW command and goes through a process of resetting the operation of the RLC layer. (Steps 51,52,53,54,55).

6 is a flowchart illustrating an RLC layer RST (reset command) retransmission process using a state variable VT (RST).

The reset command is performed by transmitting a RESET PDU to a receiver when the VT (MRW) value is equal to or larger than MaxMRW or when resetting the operation of the RLC layer for other reasons. The sender starts the timer RESETPDU together with the transmission of the RESET PDU. If the timer fails to receive the RESET ACK PDU, the acknowledgment information, until the timer expires, the sender retransmits the same RESET PDU.

VT (RST) means the number of times the reset command has been transmitted. This value increases by one each time the sender sends a RESET PDU. If the value of the VT (RST) is equal to or greater than MaxRST, the RLC layer determines that no further recovery is possible, notifies the upper layer, and stops the operation. (Steps 61, 62, 63, 64, 65).

By the various state variables described above, the RLC layer can obtain various information necessary for retransmission of the RLC PDU and the operation of the RLC layer without providing assistance from the upper layer, and provide a basis for operating independently.

However, the operation of the above-described VT (DAT), VT (MRW) and VT (RST) is increased by 1 for each transmission of the corresponding information (each RLC PDU, MRW command, RESET PDU) as shown in Figs. When this value reaches the threshold (MaxDAT, MaxMRW, Max, RST, respectively), the procedure is terminated and a request is made for further work. In this case, let's look at the problems of the retransmission method according to each state variable.

First, consider the problem of the retransmission method of the RLC PDU. If the value of VT (DAT) is MaxDAT-1 and a negative response arrives from the receiving side, the transmitting side retransmits the corresponding PDU and increases the value of VT (DAT) by one.

At this time, since the value of VT (DAT) is equal to MaxDAT, the transmitting side immediately discards the associated RLC PDU and RLC SDU and transmits an MRW instruction. Since the MRW command includes discard information on the RLC PDU transmitted immediately before, the MRW command must discard the RLC PDU even if the receiving side successfully receives the corresponding RLC PDU. Therefore, the PDU transmitted immediately before and the discarding information for the PDU can be transmitted almost simultaneously, resulting in unnecessary RLC PDU transmission.

Second, consider the problem of the retransmission method of the receive window movement command. If the value of the VT (MRW) is MaxMRW-1 and the MRW_ACK has not been received before the timer_MRW which is driven expires, the sender issues the same MRW command. Retransmit and increase the value of VT (MRW) by one.

At this time, since the value of VT (MRW) is equal to MaxMRW, the procedure related to the reception window movement is immediately terminated and the RESET PDU is transmitted to the receiver. The transmitted reset command invalidates the previous MRW command and synchronizes the RLC layers of the sender and the receiver. Therefore, even if the previous MRW command is successfully received at the receiver, the reset RLC layer is not effective. The reset command will be executed. This unnecessarily results in sending the MRW instruction.

Third, consider the problem of the retransmission method of the RLC reset command. If the value of VT (RST) is MaxRST-1 and the RESET ACK PDU has not been received before the driven Timer_RST expires, the transmitting side retransmits the RESET PDU and increases the value of VT (RST) by one.

At this time, since the value of VT (RST) is equal to MaxRST, the RLC layer immediately stops all operations and informs that the resetting process of the RLC layer has failed to a higher layer. In this case, the RESET PDU sent immediately before is not effective even if the receiving side has successfully received, resulting in the unnecessary transmission of the RESET PDU.

As in each of the above cases, it can be seen that the conventional data or control information retransmission method unnecessarily transmits the data or control information. In addition, using such a retransmission method may cause a fatal error in system operation. For example, consider a case where the values of MaxDAT, MaxMRW, and MaxRST, which are threshold values of each state variable, are set to "1". After the initial transmission of a specific PDU, the value of VT (DAT) becomes "1", and the sender immediately sends an MRW instruction for the PDU that has been transmitted. "Will send the RESET PDU immediately. In addition, immediately after transmitting the RESET PDU, the value of the VT (RST) becomes "1", and the transmitting side goes through a process of notifying that an error has occurred to an upper layer. That is, when the threshold value of the state variable is set to "1", the system does not operate normally.

In order to solve the problems related to the retransmission method of the data and control information, the present invention provides a method of waiting for the success of data or control information transmitted immediately before the value of each state variable is equal to or greater than a threshold as follows. Suggest.

1. Retransmission of RLC PDU: If the value of the state variable VT (DAT) is equal to or larger than the threshold MaxDAT, the sender confirms the success or failure of the immediately transmitted RLC PDU according to the information of the state PDU sent from the receiver. If the RLC PDU fails to transmit, error processing is performed.                         

2. Retransmission of Receive Window Move Instruction: When the value of state variable VT (MRW) is equal to or larger than MaxMRW, which is the threshold value, when the sending side does not receive MRW_ACK until the expiration of Timer_MRW, a timer driven together with the transmission of MRW instruction. Only error handling proceeds.

3. Retransmission of RLC RESET PDU: If the value of the state variable VT (RST) is equal to or greater than the threshold MaxRST, the sender does not receive the RESET ACK PDU until the expiration of Timer_RST, a timer driven with the transmission of the RESET PDU. Only in this case, proceed with error handling.

Method for retransmitting data and control information of a radio link control layer in a UMTS system according to the present invention,

In a mobile communication system that receives a transmission confirmation from a receiver among information transmission methods, a process of retransmission and confirmation a predetermined number of times when a series of processes of transmitting information such as data or control information and receiving confirmation from the receiver continues to fail. It is related to the information retransmission process of repeating the information. When the transmission of specific information continues to fail or the number of transmissions is equal to or exceeds the predetermined number of times and the transmission of the information previously transmitted fails, the sender gives up the retransmission and an error occurs. Characterized in that the processing process. In particular, when the transmission of data or control information continuously fails, it is related to the process of retransmission by comparing the number of transmissions with a threshold value, and the number of transmissions of the data is a threshold value because the transmission of specific data (RLC PDU) continues to fail. When the transmission of the data transmitted immediately before or equal to (MaxDAT) fails, the transmitting side transmits a receiving window moving (MRW) command to the receiving side, and is a receiving window moving instruction that is control information. When the reception window move command transmitted before the reception window move command is equal to or larger than the threshold value MaxMRW and the transmission window fails continuously, the sender commands the receiver to reset the radio link control layer. Another feature of the present invention is to transmit a reset command for transmitting a reset command which is control information. Another feature is that when the reset command sent before the number of times equal to or greater than the threshold MaxRST fails, the transmitting side reports it to a higher layer.

 In addition, if the continuous transmission of the data or the transmission of control information for the same fails continuously, the process is related to the retransmission by comparing the number of transmissions with a threshold value. Transmitting a receiving window shift (MRW) command to a receiving side when the transmission of the data, which was transmitted immediately before the data transmission frequency is equal to or greater than the threshold MaxDAT and failed, is failed. ; When the transmission of the reception window movement command continues to fail and the transmission of the reception window movement command transmitted immediately before the reception window movement command is equal to or greater than the threshold value MaxMRW fails, the transmitter side wirelessly transmits to the reception side. Transmitting a reset command for instructing reset of the link control layer; Transmitting a reset command when the reset command, which has been transmitted immediately before the reset command has failed since the transmission of the reset command is equal to or greater than a threshold value MaxRST, fails to be reported to a higher layer. It is characterized by.

Objects and features according to the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Hereinafter, a retransmission method of data or control information according to the present invention will be described with reference to the accompanying drawings.

The present invention improves the retransmission method of data or control information in the RLC layer to prevent unnecessary waste of transmitted data and solves operational errors that may occur according to system settings. The retransmission process of data and control information by the proposed method is examined.

7 is a flowchart summarizing a retransmission process of an RLC PDU using a state variable VT (DAT) according to the present invention.

First, the RLC PDU is generated, the state variable is set to 0, it is determined whether the transmission condition is satisfied, the information is transmitted, and the state variable is increased by 1, thereby the size of the state variable and the preset threshold value. If the state variable value (counter value) is equal to or larger than the threshold value, the reception is confirmed. If the transmission is not successful, the transmission / reception setting is changed. (Steps 71,72,73,74,75,76,77).

8 is a flowchart illustrating a retransmission process of an RLC PDU using a state variable VT (DAT).

As shown in the figure, when a PDU is generated in the RLC layer, the state variable VT (DAT) value indicating the number of transmissions of the corresponding PDU is set to 0. (Step 81).

After that, the corresponding PDU is transmitted, the value of VT (DAT) is increased by 1, and this value is compared with the threshold (MaxDAT). If the value of the VT (DAT) is less than the threshold value and receives a negative response from the receiver, the corresponding PDU is retransmitted and the value of the VT (DAT) is increased by one. (Steps 82,83,84,85).

If the value of VT (DAT) is equal to or larger than the threshold, the sender ends the transmission if it receives an acknowledgment for the PDU sent immediately before. If it receives a negative response, it stops retransmission for the PDU. Execute receive window move command. (Step 86,87).

That is, if the value of the VT (DAT) is equal to or larger than the threshold immediately after transmitting a specific PDU, the transmitter performs a processing procedure according to whether the corresponding PDU is successful. According to the above method, after the value of VT (DAT) becomes MaxDAT, the number of RLC PDUs transmitted until the control procedure for this is the same as the conventional method, but the last RLC PDU is not wasted. That is, the number of retransmissions is the same, but the success or failure of the last retransmission PDU is checked, thereby preventing the last PDU from being transmitted without meaning. In addition, even if the value of MaxDAT is set to "1", an error of discarding immediately after transmission of the transmitted PDU does not occur.

9 is a flowchart illustrating a retransmission process of an MRW (receive window movement) command using a state variable VT (MRW).

As shown in the figure, the state variable VT (MRW) is updated after the transmission of the MRW command, and the corresponding MRW command until the value of the updated VT (MRW) is smaller than the threshold value MaxMRW and Timer_MRW expires. If no acknowledgment is received, the same MRW command is resent to the receiver. If the value of VT (MRW) is greater than or equal to the threshold value and no positive response is received for the corresponding MRW command until Timer_MRW expires, an error handling procedure is performed. (Steps 91,92,93,94,95,96).

According to the method, the number of MRW commands transmitted until the value of VT (MRW) becomes MaxMRW and the RESET PDU is transmitted is the same as the conventional method, but the last MRW command transmitted is not wasted. In addition, even if the value of MaxMRW is set to "1", an error of sending a RESET PDU immediately after transmission of the transmitted MRW command does not occur.

10 is a flowchart illustrating a process of retransmitting a reset command of an RLC layer using a state variable VT (RST).

As shown in the figure, the state variable VT (RST) is updated after the transmission of the RESET PDU, and the value of the updated VT (RST) is smaller than the threshold value MaxRST and the corresponding RESET PDU expires until Timer_RST expires. If no positive acknowledgment is received, the RESET PDU is retransmitted. If the value of the VT (RST) is greater than or equal to the threshold and no positive response is received for the corresponding RESET PDU until the Timer_RST expires, it is reported to the higher layer. (Step 101,102,103,104,105,106).

According to the method, the number of RESET PDUs transmitted until the value of VT (RST) becomes MaxRST and reports to the upper layer is the same as the conventional method, but the last RESET PDUs transmitted are not wasted. In addition, even if the value of MaxRST is set to "1", the error notifying the upper layer immediately after the transmission of the transmitted RESET PDU does not occur.

As described above, in the present invention, a method of retransmitting data or control information by a state variable has been described.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments.

Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, according to the retransmission method of the data or control information according to the state variable of the present invention, it is possible to reduce unnecessary transmission of the data or control information and to transmit each information (each RLC PDU, MRW command, and RESET PDU) only once. By solving errors that may occur in the designed system, the system can be operated more efficiently and reliably.

Claims (8)

In the transmission system of the wireless communication which transmits the information of a transmitter to a receiver, and retransmits the information which failed transmission, about the specific information, a transmitter sends, Initializing a transmission counter; Transmitting specific information to a receiving side; Here, the specific information is data of a unit determined by the radio link control layer, Increasing or decreasing a value of the transmission counter after transmitting the specific information; And when the value of the transmission counter reaches a predetermined specific value, determining whether the transmitted specific information has been successfully received. The information retransmission method of claim 1, further comprising changing a transmission / reception setting if transmission is not determined to be successful in the determination step. The method of claim 1, And a transmission system of the wireless communication is a mobile communication terminal or a device in a mobile communication network. The method of claim 3, wherein When the value of the transmission counter reaches a predetermined value, when the information indicating that the transmission of the data has failed is received from the receiving side or when the transmitting side recognizes that the transmission of the information has failed by itself, the data is received. Information retransmission method characterized in that the error processing proceeds without the transmission. The method of claim 1, And the transmission system of the wireless communication is a mobile communication terminal or a device in a mobile communication network, and the specific information is a reception window movement command. The method of claim 5, wherein When the value of the transmission counter reaches a predetermined value, if the acknowledgment is not received for the corresponding receiving window moving command until the timer which is driven after the receiving window moving command is transmitted, or the receiving side receives the corresponding receiving window moving command. When information indicating that the window move command has failed is transmitted or when the sender recognizes that the corresponding window move command has failed, the receiving window move command is not transmitted. Information retransmission method characterized in that the progress. The method of claim 1, The transmission system of the wireless communication is a mobile communication terminal or a device in a mobile communication network, wherein the specific information is a re-transmission method of the radio link control layer. The method of claim 7, wherein When the value of the transmission counter reaches a predetermined value, when the reset command is transmitted to the receiving side and the acknowledgment is not received until the expiration of the driven timer, the reset command is received from the receiving side. If the information indicating that the transmission has failed is received or if the sender recognizes that the corresponding receive window movement command has failed, the error processing procedure is proceeded without transmitting the command requesting the resetting of the radio link layer. Information retransmission method characterized in that.

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