KR20100106890A - Apparatus and method for operating duplication harq in mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for operating duplication HARQ in mobile communication system are provided to prevent the duplication of MAC PDU by determining whether MAC PDU is received repeatedly. CONSTITUTION: A terminal(300) transmits a sound reference signal or a demodulation reference signal to a base station(310). The base station transmits a TA command MAC CE to the terminal(312). The terminal compensate a reverse timing by applying a TA command according to the duplication phenomenon of the TA command MAC CE(314). The terminal transmits ACK to the base station to indicate the success of reception of the TA command MAC CE(316). The base station retransmits an MAC PDU including the TA command MAC CE to the terminal(318).

Description

Operation method and device according to data redundancy retransmission in mobile communication system {APPARATUS AND METHOD FOR OPERATING DUPLICATION HARQ IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to an operation method and apparatus for data redundancy retransmission in a mobile communication system. In particular, in a Long Term Evolution (LTE) system supporting HARQ, a terminal transmits an ACK for forward data, but the base station NACKs the ACK. When retransmission of the forward data is determined to determine that, the terminal determines that the forward data is redundantly retransmitted and relates to a method and apparatus for preventing the duplication of the data.

The Universal Mobile Telecommunication Service (UMTS) system is based on the European mobile system Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), and uses wideband code division multiple access (CDMA). The third generation asynchronous mobile communication system using.

The 3rd Generation Partnership Project (3GPP) in charge of standardizing the UMTS system is discussing Long Term Evolution (LTE) as the next generation mobile communication system of the UMTS system. LTE is a technology for implementing high-speed packet-based communication having a transmission rate of up to about 100 Mbps, and aims to commercialize it in 2010, and various methods have been discussed for this purpose. For example, a method of simplifying a network structure to reduce the number of nodes located on a communication path or a method of bringing wireless protocols as close to a wireless channel as possible is discussed.

1 illustrates the structure of an LTE system.

Referring to FIG. 1, next-generation radio access networks (E-RANs) 110 and 112 may include next-generation base station (ENB: Evolved Node B or Node B) 120 to 128 and an upper node (Access Gateway). (130, 132) is simplified to a two-node structure, the user equipment (UE) (101) is connected to the Internet Protocol (IP) network by the E-RAN (110, 112). The ENBs 120 to 128 are connected to the UE 101 by a radio channel and perform a more complicated role than the existing Node B.

In the LTE system, a media access control (MAC) is provided for a control signal that is more reliable than a control signal of a physical layer and that requires faster processing than a control signal of a radio link control (RLC) layer. Layer control signal, that is, MAC CE (MAC control element) is used. For example, in the LTE system, Timing Advance (TA) Command MAC CE, which is a control signal of the MAC layer, is used to synchronize backward transmission timing.

2 illustrates a procedure of performing backward transmission timing synchronization using a TA command MAC CE in an LTE system.

Referring to FIG. 2, the base station (ENB) 202 is based on a sounding reference signal (SRS) or a demodulation reference signal (DMRS) transmitted by the terminal 200 in step 210. After measuring the backward timing offset, if it is determined that the reverse timing offset needs to be corrected, or if it is determined that the TA command needs to be updated by updating the TA timer, the process proceeds to step 210. The command MAC CE is transmitted to the terminal 200. Thereafter, the terminal 200 synchronizes backward timing synchronization with the base station by using the TA command received in step 214, and reverse channel (PUCCH, PUSCH) and the reverse timing based on the reverse timing corrected by the TA command in step 216. Transmit reverse signal.

Meanwhile, in the LTE system, the terminal transmits an ACK for the forward HARQ data, but the base station cannot determine or receive the NACK as the NACK, and thus retransmits the forward HARQ data, so that the terminal duplicates the direction HARQ data. Reception may occur. However, the conventional LTE system does not provide a technology for detecting duplicate data reception at the MAC layer. Accordingly, when the MAC PDU previously received and decoded normally is repeatedly received, the UE performs an unnecessary operation for reprocessing the duplicately received MAC PDU, which eventually causes an error of the system. For example, the terminal does not recognize when the MAC PDU including the Timing Advance Command MAC CE is duplicated, and resynchronizes backward timing synchronization with the base station by using the received TA command. Generates an error that compromises transmission timing synchronization.

The present invention is derived to solve the above problems, an object of the present invention is to provide an operation method and apparatus according to data redundancy retransmission in a mobile communication system.

Another object of the present invention is to provide a method and apparatus for preventing duplicate processing of a MAC PDU previously processed by determining whether a MAC PDU is duplicated in a Long Term Evolution (LTE) system supporting HARQ.

Another object of the present invention is to add a serial number to a control signal (TA command MAC CE) of the MAC layer for backward timing synchronization in the LTE system to prevent the timing synchronization is damaged due to redundant retransmission of data In providing.

Another object of the present invention is to provide a method and apparatus for preventing data duplication processing by using HARQ-related information of a MAC PDU including a TA command MAC CE of a MAC layer for backward timing synchronization in an LTE system. have.

It is still another object of the present invention to provide a method and apparatus for preventing duplication of data using a successful decoding of HARQ data and a size of data in an LTE system.

According to a first aspect of the present invention for achieving the above object, a method of operating a terminal according to data redundancy retransmission in a mobile communication system, the process of receiving a MAC PDU from a base station, and the MAC PDU to perform backward timing synchronization Determining whether to include the control signal of the MAC layer for correction; and if the control signal of the MAC layer is included, the control signal of the MAC layer is duplicated using a serial number of the control signal of the MAC layer. Characterized in that it comprises the process of determining the reception.

According to a second aspect of the present invention for achieving the above objects, the operation method of the base station for data redundancy retransmission in the mobile communication system, MAC, including the serial number when the event occurs to correct the reverse timing synchronization of the terminal Generating a control signal of the layer, and generating a MAC PDU including the control signal of the MAC layer and transmitting the generated MAC PDU to a corresponding terminal.

According to a third aspect of the present invention for achieving the above objects, an apparatus of a terminal according to data redundancy retransmission in a mobile communication system includes a receiver for receiving a MAC PDU from a base station, and the MAC PDU to correct backward timing synchronization; Determining whether a control signal of the MAC layer is included, and if the control signal of the MAC layer is included, determining that the control signal of the MAC layer is repeatedly received using a serial number of the control signal of the MAC layer. It characterized in that it comprises a control unit.

According to a fourth aspect of the present invention for achieving the above objects, the apparatus of the base station according to data redundancy retransmission in the mobile communication system, MAC layer including a serial number when an event for correcting the reverse timing synchronization of the terminal occurs; MAC control signal generation unit for generating a control signal of the control unit, MAC generation unit for generating a MAC PDU including the control signal of the MAC layer, HARQ anti to control to transmit the MAC PDU to the terminal according to the HARQ procedure It is characterized by including a tee.

In the present invention, in the LTE (Long Term Evolution) system, the UE determines whether the MAC PDUs are duplicated and prevents the MAC PDUs previously processed normally from being duplicated, thereby eliminating unnecessary operations and damaging backward timing synchronization. It can be prevented, and there is an effect that can transmit more reliable reverse data and signals.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention relates to a method and apparatus for preventing a terminal from processing a MAC PDU that has been normally processed by determining whether a UE receives a duplication of a MAC PDU in a Long Term Evolution (LTE) system supporting HARQ. I will explain. Here, although the terminal transmits an ACK for the MAC PDU, the base station retransmits the MAC PDU because the base station does not determine or receive the ACK NACK, the duplicated MAC PDU due to the terminal receives the MAC PDU duplication (duplication) This is called a phenomenon.

First, in the present invention, when a duplicate phenomenon occurs in the MAC PUD including the TA Command MAC CE by adding a serial number to the Timing Advance (TA) Command MAC CE which is a control signal of the MAC layer for backward timing synchronization, A technique for preventing the TA Command MAC CE from being duplicated will be described.

3 illustrates a signal flow for determining and processing a duplicate phenomenon of a MAC PDU using a serial number in an LTE system according to an embodiment of the present invention.

Referring to FIG. 3, the UE 300 first performs a sounding reference signal (SRS) or a demodulation reference signal (SRS) using resources allocated by the ENB 302 in step 310. DMRS (DeModulation Reference Signal) is transmitted to the base station 302. Then, the base station 302 checks the reverse timing offset using the SRS or DMRS of the terminal in step 312, and determines whether the correction of the reverse timing offset is necessary, if the correction is necessary, the serial number according to the present invention A TA command MAC CE including a sequence number (SN) is generated and transmitted to the terminal 300. As illustrated in FIG. 6, the TA command MAC CE includes a 2-bit serial number or reservation information (SN0 or R, SN1 or R) 601 and 603 and 6-bit TA command information 605. . In this case, SN0 or SN1 means a serial number and R means reserved information. That is, when a 2-bit serial number is used in the system, both SN0 or R and SN1 or R (601, 603) may be used as the serial number. When using a 1-bit serial number, the SN0 or R and One of SN1 or R (601, 603) may be used as a bit for serial number and the other may be used as a bit for reserved information.

Upon receiving the TA command MAC CE, the terminal 300 checks the serial number included in the TA command MAC CE in step 314 and compares it with the serial number of the previously received TA command MAC CE. In this case, it is determined that duplication of TA command MAC CE does not occur, and the backward timing is corrected by applying the received TA command. In step 316, the terminal 300 transmits an ACK to the base station 302 to indicate that the TA command MAC CE is successfully received.

However, when the base station 302 determines that the ACK is NACK, the base station 302 retransmits the MAC PDU including the TA command MAC CE including the serial number to the terminal 300 in step 318. . In this case, when receiving the retransmitted MAC PDU, the terminal 300 checks the serial number in the TA command MAC CE included in the received MAC PDU in step 320 and compares the serial number of the previously received TA command MAC CE. When the two serial numbers are the same, it is determined that a duplication phenomenon occurs for the TA command MAC CE and discards the TA command MAC CE without processing.

4 is a flowchart illustrating an operation procedure of a terminal for determining and processing a duplicate phenomenon of a MAC PDU using a serial number in an LTE system according to an embodiment of the present invention.

Referring to FIG. 4, the terminal transmits a sounding reference signal (SRS) or a demodulation reference signal (DMRS) to a base station in step 401, and receives a MAC PDU from the base station in step 403.

In step 405, the terminal determines whether the TA command MAC CE is included in the MAC PDU. Here, whether the TA command MAC CE is included may be checked through a logical channel ID of a MAC header. If the TA command MAC CE is not included in the MAC PDU, the terminal proceeds to step 407 and processes the contents of the MAC PDU, and returns to step 403 according to the present invention and performs the following steps again.

On the other hand, if the TA command MAC CE is included in the MAC PDU, the terminal proceeds to step 409 to check the serial number included in the TA command MAC CE and the serial number and the previously received TA command MAC CE The serial numbers are compared to determine whether the two serial numbers are the same. In this case, when the TA command MAC CE is first received, since there is no serial number previously received, the terminal may determine that the serial numbers are not the same. In addition, the terminal may preset the serial number not used in the base station as the initial serial number, so that the two serial numbers are not the same when the TA command MAC CE is first received.

If the two serial numbers are the same, the terminal determines that duplication occurs for the MAC PDU including the TA command MAC CE in step 415, and discards the several TA command MAC CE. Thereafter, the terminal proceeds to step 407.

On the other hand, if the two serial numbers are not the same, the terminal performs the reverse timing synchronization by applying the TA command included in the TA command MAC CE in step 411, and proceeds to step 413 it is included in the TA command MAC CE After storing the serial number, the flow proceeds to step 407.

5 is a flowchart illustrating an operation procedure of a base station for generating and transmitting a MAC PDU including a serial number in an LTE system according to an embodiment of the present invention.

Referring to FIG. 5, the base station receives a sounding reference signal (SRS) or a demodulation reference signal (DMRS) from the terminal in step 501, and then performs a backward timing offset using the received SRS or DMRS in step 503. Measure In step 505, the base station determines whether correction of the backward timing offset is necessary. If the correction is not necessary, the base station proceeds to step 507 to generate and transmit a MAC PDU and ends the algorithm according to the present invention.

On the other hand, when the reverse timing offset is required to be corrected, the base station increases the serial number according to the present invention in step 509 and checks whether the increased serial number is greater than a preset maximum value in step 511. If the increased serial number is larger than the preset maximum value, the base station initializes the serial number in step 515 and proceeds to step 513. At this time, the serial number is initialized to a preset minimum value.

 If the increased serial number is not greater than a preset maximum value, the base station generates a TA command MAC CE including the increased serial number in step 513 and then includes the generated TA command MAC CE in step 507. The MAC PDU is generated and transmitted to the terminal, and the algorithm according to the present invention is terminated.

As described above with reference to FIGS. 3 to 6, the TA command MAC CE is prevented from being duplicated by using a serial number, thereby preventing the reverse timing synchronization from being compromised and transmitting more reliable reverse data and signals. Can be.

Next, a description will be given of a technique for preventing the TA command MAC CE from being duplicated by using HARQ-related information of the MAC PDU when a duplication phenomenon occurs for the MAC PUD including the TA Command MAC CE. do. At this time, the base station operates in the same manner as the existing LTE system. Here, the HARQ-related information is the first decoding success, the soft buffer update information, the new data indicator (NDI: New Data Indicator) information, the success of decoding the previously received data and the previously received after determining the initial transmission of the HARQ It is meant to include at least one of data and size information of currently received data.

FIG. 7 illustrates a signal flow for determining and processing an overlapping phenomenon of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention.

Referring to FIG. 7, first, the base station (ENB) 702 transmits forward HARQ data to a terminal (UE) 700 in step 710. In this case, the TA command MAC CE for correcting backward timing synchronization may be included in the forward HARQ data. In step 712, the terminal 700 receiving the forward HARQ data transmits an ACK to the base station 702 to indicate that the forward HARQ data is successfully received.

However, when the base station 702 determines that the ACK is NACK, the base station 702 retransmits the forward HARQ data in step 714. In this case, the base station may include new data indicator (NDI) information in the forward HARQ data to be retransmitted to indicate that the MAC PDU is retransmission data. That is, the NDI information is information indicating whether the currently transmitted packet data is initially transmitted packet data or retransmitted packet data. When the NDI information is 0, it indicates that the initially transmitted packet data is transmitted. When NDI information is 1, this may indicate that retransmitted packet data is transmitted. Alternatively, when initial transmission or retransmission is indicated by increasing or toggling an NDI value, this indicates that an initial transmitted packet data is transmitted when the NDI is different from the previous value or is increased, and when the NDI information is the same as before, retransmission is performed. It may indicate that the packet data to be transmitted. In this case, even if the NDI has the same value, if the size of the transmitted data is different, it may be determined that the initially transmitted packet data is transmitted.

In step 716, the terminal 700 determines whether a duplication occurs in the forward HARQ data based on the HARQ-related information on the retransmitted forward HARQ data. Here, the method for determining whether a duplication occurs in the forward HARQ data is a method of confirming that the first case that the soft buffer (soft buffer) data of the corresponding HARQ successfully decoded or the initial transmission of the corresponding HARQ data How to check whether the first decoding succeeded after the determination or whether the data of the corresponding HARQ soft buffer has been replaced or updated by being replaced with the currently received data. Alternatively, a method of checking whether the received data has been retransmitted, the data in the soft buffer has been successfully decoded successfully, and the size of the currently received data is the same as the size of the previous data may be used. In this case, when the duplication occurs as a result of the determination, the terminal 700 discards the TA command MAC CE included in the forward HARQ data without processing, and when the duplication does not occur, the terminal 700 is applied to the forward HARQ data. Reverse timing synchronization is performed by processing the included TA command MAC CE.

In step 718, the terminal 700 transmits an ACK to the base station 702.

8 is a flowchart illustrating an operation procedure of a terminal for determining and processing a duplication phenomenon of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention.

Referring to FIG. 8, the terminal transmits a sounding reference signal (SRS) or a demodulation reference signal (DMRS) to the base station in step 801, and receives HARQ data, that is, a MAC PDU from the base station in step 803.

In step 805, the terminal determines whether a duplication occurs with respect to the HARQ data based on the HARQ-related information on the received HARQ data and stores the result. Here, the method of determining whether a duplication occurs with respect to the HARQ data is a method of confirming that the soft buffer data of the corresponding HARQ is the first case successfully decoded or determining the initial transmission of the corresponding HARQ data Thereafter, the method determines whether the first decoding succeeded or whether the data of the corresponding HARQ soft buffer has been replaced or combined with the currently received data and updated. In addition, a method of checking whether the received data has been retransmitted, the data in the soft buffer has been successfully decoded successfully, and the size of the currently received data is the same as the size of the previous data can be used. Here, a method of determining whether a duplication occurs with respect to the HARQ data will be described in detail with reference to FIGS. 9 to 25.

In step 807, the terminal determines whether the TA command MAC CE is included in the MAC PDU. Here, whether the TA command MAC CE is included may be checked through a logical channel ID of the MAC header. If the TA command MAC CE is not included in the MAC PDU, the terminal proceeds to step 809 to process the contents of the MAC PDU, and returns to step 803 according to the present invention to perform the following steps again.

If the TA command MAC CE is included in the MAC PDU, the terminal proceeds to step 811 to determine whether the stored duplicated phenomenon occurs.

When the duplication occurs, the terminal discards the TA command MAC CE included in the MAC PDU in step 815. Thereafter, the terminal proceeds to step 809. On the other hand, when it is confirmed that the duplication does not occur, the terminal performs a reverse timing synchronization by applying a TA command included in the TA command MAC CE of the MAC PDU in step 813, and proceeds to step 809. Perform the steps.

In this case, the terminal does not only determine whether to apply or discard the TA command according to whether a duplication phenomenon occurs for the HARQ, but the process of operation 809, that is, processing the contents of the remaining MAC PDUs. It may be performed differently, which will be described in detail with reference to FIGS. 9 to 25.

Next, referring to FIGS. 9 to 25, a method for determining whether a duplication phenomenon occurs for the corresponding HARQ data using HARQ-related information and a method for processing the data according to the result of the duplication phenomenon will be described. Let's take a closer look.

First, a method of determining and processing a duplicate phenomenon for corresponding HARQ data will be described with reference to FIGS. 9 through 12 by using a decoding result of a HARQ data and a size of data.

9 is a flowchart illustrating an operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention.

Referring to FIG. 9, the terminal first receives forward HARQ data from the base station in step 901 and checks HARQ information in step 903. Here, the HARQ information includes NDI information indicating whether the currently transmitted data is initial transmission data or retransmission data.

In step 905, the terminal determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data instead of retransmission data, the terminal replaces the received data with a soft buffer of the corresponding HARQ in step 907 and then proceeds to step 909. On the other hand, if the received data is retransmission data, the terminal proceeds to step 915 to check whether the previous data of the HARQ successfully decoded.

If the previous data of the HARQ has not been successfully decoded, the terminal combines and stores the received data with previous data in the soft buffer of the HARQ in step 917 to improve the decoding success rate of the data. The process proceeds to step 909 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 923 to check whether the previous data of the HARQ and the size of the received data is the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the data in the soft buffer of the corresponding HARQ, the process proceeds to step 909.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal determines that the overlap of the received data has occurred, proceeds to step 927 and discards the received data, decoding The process proceeds to step 921 below without generating a process and generates an ACK for the corresponding HARQ data and transmits it to the base station. As described above, in the present invention, a process of decoding the data in which the duplication occurs may be omitted, and additional operations and malfunctions due to the duplication may be prevented. In this case, the step of discarding the received data of step 921 may be omitted in operation.

In step 909, the terminal decodes the data in the soft buffer. In step 911, the terminal determines whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 919 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or a higher layer, and then the corresponding HARQ data in step 921. It generates an ACK for and transmits to the base station.

On the other hand, if the decoding fails, the terminal generates a NACK for the corresponding HARQ data in step 913 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

Referring to FIG. 9 described above, when the retransmitted received data has not been successfully decoded previously but the size of the data is different, that is, when the retransmitted data is different from the previous data, the retransmitted data is the data in the previous soft buffer. There is a disadvantage that can be decoded in combination with. 10 to 12, various operating procedures of the terminal for overcoming the above disadvantages will be described.

FIG. 10 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention.

Referring to FIG. 10, the terminal receives forward HARQ data from a base station in step 1001, and checks HARQ information, that is, NDI information in step 1003.

In step 1005, the terminal determines whether the received data is retransmitted data based on the HARQ information. If the received data is initial transmission data instead of retransmission data, the terminal replaces the received data with the soft buffer of the corresponding HARQ in step 1007 and then proceeds to step 1009.

On the other hand, if the received data is retransmission data, the terminal proceeds to step 1015 and checks whether the previous data of the corresponding HARQ and the size of the received data are the same. If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the stored data with the soft buffer of the corresponding HARQ, the process proceeds to step 1009.

On the other hand, if the previous data of the HARQ and the size of the received data is the same, the terminal proceeds to step 1023 to check whether the previous data of the HARQ successfully decoded. If the previous data of the HARQ is not successfully decoded, the UE stores the received data in combination with the previous data in the soft buffer of the HARQ in step 1025 to improve the decoding success rate of the data. Proceed to step 1009.

On the other hand, if the previous data of the corresponding HARQ is successfully decoded, the terminal determines that the overlap of the received data has occurred, proceeds to step 1027 and discards the received data, without going through the decoding process In step 1021, an ACK for the corresponding HARQ data is generated and then transmitted to the base station.

Thereafter, the terminal decodes data in the soft buffer in step 1009, and proceeds to step 1011 to check whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 1019 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or to an upper layer, and then the corresponding HARQ data in step 1021. It generates an ACK for and transmits to the base station.

On the other hand, if the decoding fails, the terminal generates a NACK for the HARQ data in step 1013 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 11 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention.

Referring to FIG. 11, the terminal receives forward HARQ data from a base station in step 1101, and checks HARQ information, that is, NDI information in step 1103.

In step 1105, the terminal determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data rather than retransmission data, the terminal replaces the received data with the soft buffer of the corresponding HARQ in step 1107 and then proceeds to step 1109. In contrast, if the received data is retransmission data, the terminal proceeds to step 1115 and checks whether previous data of the corresponding HARQ has been successfully decoded.

If the previous data of the corresponding HARQ is not successfully decoded, the terminal combines and stores the received data with previous data in the soft buffer of the corresponding HARQ in step 1117 to improve the decoding success rate of the data. The process proceeds to step 1123 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal proceeds directly to step 1123 to check whether the previous data of the HARQ and the size of the received data is the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After the data is replaced with the soft buffer of the HARQ and stored, the process proceeds to step 1109.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal proceeds to step 1127 to determine whether or not a duplicate phenomenon occurs for the received data. Here, the terminal confirms that the soft buffer data of the corresponding HARQ is the first case successfully decoded, or the method of confirming whether the initial decoding succeeded after determining the initial transmission of the corresponding HARQ data or corresponding It is also possible to check whether the data in the HARQ soft buffer has been replaced, combined or updated with the currently received data, the received data has been retransmitted, previously the data in the soft buffer has been successfully decoded and The duplication phenomenon may be determined by using a method of checking whether the size of the received data is the same as the size of the previous data. In this case, when it is determined that the duplication does not occur, the terminal proceeds to step 1109 below. When it is determined that the duplication occurs, the terminal proceeds to step 1129 and discards the received data and does not proceed with the decoding process. In step 1121, an ACK for the corresponding HARQ data is generated and then transmitted to the base station.

In step 1109, the terminal decodes the data in the soft buffer, and in step 1111, the terminal determines whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 1119 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or to an upper layer, and then the corresponding HARQ data in step 1121. It generates an ACK for and transmits to the base station.

On the other hand, if the decoding fails, the terminal generates a NACK for the corresponding HARQ data in step 1113 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

12 is a flowchart illustrating another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 11, a detailed description of the operation will be omitted. In FIG. 11, when the previous data and the currently received data are not the same, the received data is replaced with the soft buffer and stored, and the data of the soft buffer is decoded. After performing step 1225 of replacing and storing the data in the soft buffer, the process proceeds to step 1227 instead of decoding the data of the soft buffer, and determines whether duplication of the received data has occurred.

In the first embodiment described with reference to FIGS. 9 to 12, the redundant operation of the received data is determined to prevent additional decoding, and thus unnecessary operations are omitted. Unlike the HARQ operation for the non-general operation, an unusual operation occurs in which the ACK is transmitted without decoding the corresponding soft buffer data of the retransmitted data. Accordingly, in FIGS. 13 to 15, operation procedures for preventing duplicate processing of MAC PDUs while maintaining HARQ operation of an existing system will be described. That is, in FIG. 13 to FIG. 15, when it is determined that duplication of received data has occurred, the decoded MAC PDU is delivered to a corresponding MAC disassembly and demultiplexing entity or delivered to a higher layer. Let's take a look at how to prevent it.

FIG. 13 is a flowchart illustrating an operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a second embodiment of the present invention.

Referring to FIG. 13, first, a UE receives forward HARQ data from a base station in step 1301 and checks HARQ information, that is, NDI information in step 1303. In step 1305, the terminal determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data instead of retransmission data, the terminal replaces the received data with the soft buffer of the corresponding HARQ in step 1307 and then proceeds to step 1309. On the other hand, if the received data is retransmission data, the terminal proceeds to step 1315 and checks whether previous data of the corresponding HARQ has been successfully decoded.

If the previous data of the HARQ is not successfully decoded, the terminal stores the received data in combination with the previous data in the soft buffer of the HARQ in step 1317 to improve the decoding success rate of the data. The process proceeds to step 1309 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 1321 to check whether the previous data of the HARQ and the size of the received data is the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the data with the soft buffer of the corresponding HARQ, the process proceeds to step 1309.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal determines that the overlap of the received data has occurred, proceeds to step 1329 and discards the received data to soften it Without storing in the buffer, it proceeds to step 1309 below.

In step 1309, the terminal decodes the data in the soft buffer. In step 1311, the terminal determines whether the decoding is successful. If the decoding fails, the terminal generates a NACK for the corresponding HARQ data in step 1313 and transmits the NACK to the base station.

On the other hand, if the decoding is successful, the terminal proceeds to step 1319 and determines whether the decoded data is data that is duplicated. Here, the terminal confirms that the soft buffer data of the corresponding HARQ is the first case successfully decoded, or the method of confirming whether the initial decoding succeeded after determining the initial transmission of the corresponding HARQ data or corresponding Using the method of checking whether the data in the HARQ soft buffer has been replaced or combined with the currently received data, or the received data has been retransmitted, the data in the soft buffer has been successfully decoded and the currently received The duplication phenomenon may be determined by using a method of checking whether the size of the data is the same as the size of the previous data.

If it is determined that the decoded data is data that does not cause duplication, the terminal proceeds to step 1325 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or a higher level. After transmitting to the layer, the process proceeds to step 1327 and if it is determined that the decoded data is overlapping data, the process proceeds directly to step 1327 and generates an ACK for the corresponding HARQ data and transmits it to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

Referring to FIG. 13 described above, when the retransmitted received data has not been successfully decoded previously but the size of the data is different, that is, when the retransmitted data is different from the previous data, the retransmitted data is the data in the previous soft buffer. There is a disadvantage that it can be decoded in combination with. Therefore, hereinafter, various operational procedures of the terminal for overcoming the above disadvantages will be described.

FIG. 14 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the second embodiment of the present invention.

Referring to FIG. 14, first, a UE receives forward HARQ data from a base station in step 1401 and checks HARQ information, that is, NDI information in step 1403. In step 1405, the terminal determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data rather than retransmission data, the terminal replaces the received data with the soft buffer of the corresponding HARQ in step 1407 and then proceeds to step 1409. On the other hand, if the received data is retransmission data, the terminal proceeds to step 1415 and checks whether the previous data of the corresponding HARQ and the size of the received data are the same. If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the data in the soft buffer of the corresponding HARQ, the process proceeds to step 1409.

On the other hand, if the previous data of the HARQ and the size of the received data is the same, the terminal proceeds to step 1421 to check whether the previous data of the HARQ successfully decoded. If the previous data of the HARQ has not been successfully decoded, the terminal combines and stores the received data with previous data in the soft buffer of the corresponding HARQ in step 1423 to improve the decoding success rate of the data. Proceed to step 1409 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal determines that a duplicate phenomenon has occurred for the received data, proceeding to step 1429 and discards the received data to store it in the soft buffer If no, the process proceeds to step 1409.

Thereafter, the terminal decodes the data in the soft buffer in step 1409, and proceeds to step 1411 to determine whether the decoding is successful. If the decoding fails, the UE generates a NACK for the corresponding HARQ data in step 1413 and transmits the NACK to the base station.

On the contrary, if the decoding is successful, the terminal proceeds to step 1419 and determines whether the decoded data is data in which duplication occurs. Here, the terminal confirms that the soft buffer data of the corresponding HARQ is the first case successfully decoded, or the method of confirming whether the initial decoding succeeded after determining the initial transmission of the corresponding HARQ data or corresponding A method of checking whether the data in the HARQ soft buffer has been replaced, combined or updated with the currently received data, or the received data has been retransmitted, previously the soft buffer data has been successfully decoded and is currently received The duplication phenomenon may be determined using a method of checking whether the size of the data is the same as the size of the previous data.

If it is determined that the decoded data is data that does not cause duplication, the terminal proceeds to step 1425 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or a higher level. After transmitting to the layer, the process proceeds to step 1427, and if it is determined that the decoded data is duplicate data, the process proceeds directly to step 1427 and generates an ACK for the corresponding HARQ data and transmits it to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 15 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the second embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 13, a detailed description of the operation will be omitted. In FIG. 15, the terminal performs step 1517 of combining and storing the received data with previous data stored in the soft buffer, and then proceeds to step 1521 rather than proceeding to step 1509 of decoding the data of the soft buffer. The process of determining whether the previously received data and the received data have the same size are performed.

Next, the MAC disassembly and demultiplexing entity or the higher layer processes the retransmission data like the operation of the existing system and duplicates the received data with reference to FIGS. 16 to 19. By notifying the layer, a technique of preventing a malfunction or an additional operation on a MAC PDU in which a duplication occurs will be described.

FIG. 16 illustrates an operation procedure of determining and processing a duplication phenomenon of a MAC PDU using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention.

Referring to FIG. 16, in step 1601, the UE receives forward HARQ data from a base station, in step 1603, confirms HARQ information, that is, NDI information, and indicates a duplicate indicator for indicating a duplicate phenomenon for MAC PDU of the corresponding HARQ. (duplication indicator, hereinafter referred to as dup_ind) is applied to initialize this.

In step 1605, the terminal determines whether the received data is retransmitted data based on the HARQ information. If the received data is initial transmission data instead of retransmission data, the terminal replaces the received data with the soft buffer of the corresponding HARQ in step 1607 and then proceeds to step 1609. On the other hand, if the received data is retransmission data, the terminal proceeds to step 1615 to check whether the previous data of the HARQ successfully decoded.

If the previous data of the HARQ is not successfully decoded, the terminal stores the received data in combination with the previous data in the soft buffer of the HARQ in step 1617 to improve the decoding success rate of the data. The process proceeds to step 1609 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 1623 and checks whether the previous data of the HARQ and the size of the received data is the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the data with the soft buffer of the corresponding HARQ, the process proceeds to step 1609.

In contrast, when the previous data of the corresponding HARQ and the size of the received data are the same, the terminal determines that a duplication phenomenon has occurred with the received data, and proceeds to step 1627 and discards the received data. After the initialization duplicate indicator (dup_ind) is set in step, the process proceeds to step 1609.

Thereafter, the terminal decodes the data in the soft buffer in step 1609, and proceeds to step 1611 to check whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 1619 and delivers the decoded MAC PDU and the set redundancy indicator to the corresponding MAC disassembly and demultiplexing entity or to a higher layer, and 1616. In step, an ACK for the corresponding HARQ data is generated and transmitted to the base station. Here, when the MAC disassembly and demultiplexing entity or the higher layer, which has received the MAC PDU, is set to a value indicating the duplication by checking the duplicate indicator value, the MAC PDU may discard the MAC PDU. Can be.

On the other hand, if the decoding fails, the terminal generates a NACK for the corresponding HARQ data in step 1613 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 17 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 16, a detailed description of the operation will be omitted. In FIG. 16, the size of the previous received data and the current received data is compared when the decoding is successful after determining whether the previous received data is successfully decoded. After the comparison, the decoding operation of the previous received data is determined.

FIG. 18 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention.

Referring to FIG. 18, in step 1801, the UE receives forward HARQ data from a base station, in step 1803, identifies HARQ information, that is, NDI information, and a duplicate indicator for indicating whether a duplicate phenomenon exists for the MAC PDU of the corresponding HARQ. (duplication indicator, hereinafter referred to as dup_ind) is applied to initialize this.

In step 1805, the terminal determines whether the received data is retransmitted data based on the HARQ information. If the received data is initial transmission data instead of retransmission data, the terminal substitutes and stores the received data in the soft buffer of the corresponding HARQ in step 1807, and then proceeds to step 1809. On the other hand, if the received data is retransmission data, the terminal proceeds to step 1815 and checks whether previous data of the corresponding HARQ has been successfully decoded.

If the previous data of the HARQ is not successfully decoded, the UE stores the received data in combination with the previous data in the soft buffer of the HARQ in step 1817 to improve the decoding success rate of the data. Proceed to step 1823 below. On the other hand, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 1823 to check whether the previous data of the HARQ and the size of the received data is the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After the data is replaced with the soft buffer of the HARQ and stored, the process proceeds to step 1809.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal determines in step 1827 whether or not a duplicate phenomenon for the received data occurs. In this case, the terminal confirms that the soft buffer data of the corresponding HARQ is the first case of successfully decoding, or the method of confirming whether the initial decoding is successful after determining the initial transmission of the corresponding HARQ data or the corresponding HARQ. Use the method of verifying that the soft buffer of the data has been replaced or combined with the currently received data, or that the received data has been retransmitted and that the data in the soft buffer has been successfully decoded previously and that the size of the currently received data The duplication phenomenon may be determined by using a method of checking whether the data is equal to the size of previous data.

If the duplication does not occur as a result of the determination, the terminal proceeds to step 1809 and if the duplication occurs, proceeds to step 1829 and discards the received data, and then, in step 1831, the initialized duplicate indicator ( After setting dup_ind), the process proceeds to step 1809.

Thereafter, the terminal decodes the data in the soft buffer in step 1809, and proceeds to step 1811 to confirm whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 1819 and delivers the decoded MAC PDU and the set redundancy indicator to the corresponding MAC disassembly and demultiplexing entity or the higher layer, and then to 1821. In step ACK for the corresponding HARQ data is generated and transmitted to the base station. Here, when the MAC disassembly and demultiplexing entity or the higher layer, which has received the MAC PDU, is set to a value indicating the duplication by checking the duplicate indicator value, the MAC PDU may discard the MAC PDU. Can be.

On the other hand, if the decoding fails, the terminal generates a NACK for the corresponding HARQ data in step 1813 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 19 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 18, a detailed description of the operation will be omitted. In FIG. 18, when the previous data and the currently received data are not the same, the received data is replaced with the soft buffer and stored, and the data of the soft buffer is decoded. Rather than proceeding to step 1909 for replacing and storing the data in the soft buffer and decoding the data in the soft buffer, the method proceeds to step 1927 to determine whether a duplicate phenomenon has occurred for the received data.

Next, referring to Figs. 20 to 22, the retransmission data is processed as in the operation of the existing system, and the duplicate message is notified to the MAC disassembly and demultiplexing entity or higher layer that the soft buffer is updated. A technique for preventing a malfunction or additional operation of a MAC PDU in which a phenomenon occurs will be described.

20 is a flowchart illustrating an operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a fourth embodiment of the present invention.

Referring to FIG. 20, the terminal receives forward HARQ data from a base station in step 2001, checks HARQ information, that is, NDI information in step 2003, and indicates a soft buffer update indicator indicating whether to update the soft buffer of the corresponding HARQ. (soft buffer update indicator, hereinafter called buffer_update_ind) to initialize it. In this case, an initial value of the soft update indicator indicates that the soft buffer is not updated.

In step 2005, the terminal determines whether the received data is retransmitted data based on the HARQ information. If the received data is initial transmission data rather than retransmission data, the terminal stores the received data in a soft buffer of the corresponding HARQ in step 2007 and sets the soft buffer update indicator (buffer_update_ind). Proceed to 2009 On the other hand, if the received data is retransmission data, the terminal proceeds to step 2015 and checks whether previous data of the corresponding HARQ has been successfully decoded.

If the previous data of the HARQ is not successfully decoded, the terminal stores the received data in combination with the previous data in the soft buffer of the HARQ in step 2017 to improve the decoding success rate of the data. After setting the soft buffer update indicator (buffer_update_ind), it proceeds to step 2009 below. In contrast, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 2023 and checks whether the previous data of the corresponding HARQ and the size of the received data are the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. The stored data is replaced with the soft buffer of the corresponding HARQ, and the soft buffer update indicator (buffer_update_ind) is set.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal determines that a duplicate phenomenon has occurred for the received data, proceeding to step 2027 and discards the received data to the soft Without storing in the buffer, it proceeds to step 2009 below.

Thereafter, the terminal decodes data in the soft buffer in step 2009 and proceeds to step 2011 to check whether the decoding is successful. If the decoding is successful, the terminal proceeds to step 2019 and delivers the decoded MAC PDU and the set soft buffer update indicator (buffer_update_ind) to a corresponding MAC disassembly and demultiplexing entity or an upper layer. In step 2021, an ACK for the corresponding HARQ data is generated and transmitted to the base station. Here, the M MAC disassembly and demultiplexing entity or a higher layer, which has received the MAC PDU, may discard the MAC PDU when the soft buffer update indicator (buffer_update_ind) is set to an initial value. .

On the other hand, if the decoding fails, the terminal generates a NACK for the HARQ data in step 2013 and transmits to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 21 is a flowchart illustrating another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the fourth embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 21, a detailed description of the operation will be omitted. In FIG. 20, the size of the previous received data and the current received data is compared with the previous received data when the decoding is successful after determining whether the previous received data has been successfully decoded. After the comparison, the decoding operation of the previous received data is determined.

FIG. 22 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the fourth embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 20, a detailed description of the operation will be omitted. However, in FIG. 20, when the previous data of the corresponding HARQ fails to be decoded, the received data is stored in combination with the previous data stored in the soft buffer, the soft buffer update indicator is set, and the data of the soft buffer is decoded. In FIG. 22, the received data is combined with the previous data stored in the soft buffer and stored in step 2217 of setting the soft buffer update indicator, and then proceeding to step 2223 instead of proceeding to step 2209. In operation, it is determined whether the size of the previous data and the currently received data is the same.

Finally, the decoding is performed immediately after the data in the soft buffer is updated with reference to FIGS. 23 to 25, and only when the decoding is successful, the MAC PDU is decoded from the MAC disassembly and demultiplexing entity or higher layer. By notifying, the technique of preventing a malfunction or an additional operation on a MAC PDU in which a duplicate phenomenon occurs will be described.

FIG. 23 is a flowchart illustrating an operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a fifth embodiment of the present invention.

Referring to FIG. 23, the terminal receives forward HARQ data from a base station in step 2301, and confirms HARQ information, that is, NDI information in step 2303. In step 2305, the terminal determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data instead of retransmission data, the terminal stores the received data by replacing the received data with the soft buffer of the corresponding HARQ in step 2307, and then decodes the data in the soft buffer in step 2309, Proceed to step 2311 below.

On the other hand, if the received data is retransmission data, the terminal proceeds to step 2317 and checks whether previous data of the corresponding HARQ has been successfully decoded. If the previous data of the HARQ has not been successfully decoded, the terminal combines and stores the received data with previous data in the soft buffer of the HARQ in step 2319 to improve the decoding success rate of the data. In step 2021, the data in the soft buffer is decoded. In contrast, if the previous data of the HARQ is successfully decoded, the terminal proceeds to step 2327 and checks whether the previous data of the corresponding HARQ and the size of the received data are the same.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. After replacing the data with the soft buffer of the corresponding HARQ and storing the data, the data in the soft buffer is decoded in step 2031, and the process proceeds to step 2311.

On the other hand, if the previous data of the corresponding HARQ and the size of the received data is the same, the terminal determines that a duplicate phenomenon has occurred for the received data, proceeds to step 2333 and discards the received data, decoding Proceed to step 2311 below without going through the process.

In step 2311, the terminal checks whether data decoding in the current soft buffer has been successfully performed. If the decoding is successful, the terminal proceeds to step 2323 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or to a higher layer. Proceed to step.

On the other hand, if the decoding fails, the terminal rechecks whether the current or past decoding was successful in step 2313. In other words, if the current decoding is not successful, the terminal checks whether the previous valid decoding result is successful. In this case, when the current or past decoding is successfully performed, the terminal generates an ACK for the corresponding HARQ data and transmits the ACK to the base station in step 2325. When the current and past decoding is not successful, in step 2315. Generates a NACK for the corresponding HARQ data and transmits it to the base station.

Thereafter, the terminal terminates the algorithm according to the present invention.

FIG. 24 illustrates another operation procedure of determining and processing a duplication phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to the fifth embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 23, a detailed description of the operation will be omitted. In FIG. 23, the size of the previous received data and the current received data is compared with the previous received data when the decoding is successful after determining whether the previous received data is successfully decoded. After the comparison, the decoding operation of the previous received data is determined.

FIG. 25 illustrates another operation procedure of determining and processing duplication of MAC PDU by using HARQ information in a terminal of an LTE system according to the fifth embodiment of the present invention. Here, since the terminal performs an operation similar to that of FIG. 23, a detailed description of the operation will be omitted. In FIG. 23, when the previous data of the corresponding HARQ fails to be decoded, the received data is stored in combination with the previous data stored in the soft buffer, the data of the soft buffer is decoded, and the success of the decoding is checked. In FIG. 25, the received data is combined with the previous data stored in the soft buffer and stored, and after step 2521 of decoding the soft buffer data, the process proceeds to step 2227. In operation, it is determined whether the size of the previous data and the currently received data is the same.

26 is a block diagram of a terminal in an LTE system according to the present invention.

As illustrated in FIG. 26, the terminal includes a transceiver 2600, a reception control channel processor 2602, a HARQ soft buffer 2604, a HARQ controller 2606, a decoder 2608, and a transmitter. The control channel processor 2610, the MAC disassembly and demultiplexing entity 2612, and the higher layer device 2614 are configured.

The transceiver 2600 serves to transmit and receive a PHY channel and a signal through an LTE wireless channel, and the reception control channel processor 2602 processes control channel data received through a forward control channel. Decodes and parses a control channel to transfer the analyzed information to a corresponding module, that is, the upper layer device 2614, the HARQ controller 2606, and the decoder 2608, and transmits and receives the transceiver 2600. The controlling operation can be performed.

The HARQ soft buffer 2604 replaces and stores the received data under the control of the HARQ controller 2606, or combines the previous data and the currently received data, or discards the received data.

The HARQ control unit 2606 is a device for controlling the first half of the HARQ process. The HARQ control unit 2606 is triggered by receiving the HARQ-related information from the reception control channel processing unit 2602, and replaces and stores the received data in the HARQ soft buffer 2604 using the HARQ-related information. The HARQ soft buffer 2604 is controlled according to the determination by determining whether to store or discard the data. In addition, the HARQ control unit 2606 determines whether to decode the data of the HARQ soft buffer 2604 to control the decoder 2608. In addition, the HARQ controller 2606 transmits HARQ-related control information to the upper layer device 2614, generates ACK / NACK information according to the decoding result of the decoder 2608, and sends the HARQ-related control information to the transmission control channel processor 2610. To pass. The HARQ control unit 2606 checks whether the soft buffer 2604 of HARQ is updated or replaced with the currently received data, or if the received data is retransmission data, whether the decoding of previous data is successful and currently received By using a method of confirming the size of the data and the previous data, it is determined whether the duplicate phenomenon occurs, and the processing of the corresponding data is determined.

The decoder 2608 decodes data of the corresponding HARQ soft buffer 2604 according to the instructions of the HARQ controller 2606 based on the decoding related information received from the reception control channel, and the result is decoded by the HARQ controller 2606. To provide.

The transmission control channel processor 2610 is a device for processing a reverse control channel operation, and receives information (eg, ACK / NACK information and CQI information) to be transmitted to the reverse control channel from the HARQ controller 2610 and processes the same. Then it is provided to the transceiver 2600 to be transmitted to the corresponding node.

The MAC decomposing and demultiplexing unit 2612 decomposes and demultiplexes the MAC PDU provided from the decoder 2608 based on a control signal provided from the HARQ controller 2606 and information on whether a duplicate phenomenon occurs. In particular, the MAC decomposing and demultiplexing unit 2612 checks and separates the TA command MAC CE according to the present invention to determine whether a duplication phenomenon occurs for the TA command MAC CE, and according to the determination result, the TA command MAC Process CE. That is, the MAC decomposing and demultiplexing unit 2612 discards the TA command MAC CE when the duplication occurs, and applies the TA command included in the TA command MAC CE when the duplication does not occur. Perform processing and control to obtain timing synchronization. Here, the MAC decomposing and demultiplexing unit 2612 may determine whether a duplication phenomenon for the TA command MAC CE is generated through a serial number included in the TA command MAC CE.

The upper layer device 2614 refers to a device for generating data to be transmitted and received by the terminal through a wireless channel of LTE. The upper layer device 2614 includes both an application and a control message processing device of the terminal.

27 is a block diagram of a base station in an LTE system according to the present invention.

As shown in FIG. 27, the base station includes a transceiver 2700, a reception channel and signal processor 2702, a backward timing controller 2704, a HARQ entity 2706, a MAC combination and multiplexer, and the like. And a MAC assembly and multiplexting entity 2708, a MAC CE generation unit 2710, and a higher layer device 2712.

The transceiver 2700 processes transmission and reception of a PHY channel and a signal through an LTE wireless channel,

The receiving channel and signal processor 2702 processes the channel data and the received signal received in the reverse channel. The receiving channel and signal processor 2702 decodes and analyzes a received channel, provides the received channel to the higher layer device 2712, and processes a sounding reference signal SRS and a demodulation reference signal DMRS received from a terminal. Reverse timing related information is provided to the reverse timing controller 2704.

The reverse timing controller 2704 determines a reverse timing offset based on the reverse timing information of the SRS or the DMRS provided from the receiving channel and the signal processor 2702, and determines that the reverse timing offset needs to be corrected or a TA command is determined. If it is determined that it is necessary to update the TA timer for updating, the timing offset value to be corrected is provided to the MAC CE generation unit 2710.

The HARQ entity 2706 controls the forward HARQ transmission of the corresponding user, and transmits the MAC PDU provided from the MAC combination and multiplexer 2708 to the corresponding terminal using a HARQ procedure. The HARQ entity 2706 receives HARQ-related information on the uplink reception control channel from the reception channel and the signal processor to determine whether to initially transmit or retransmit the corresponding HARQ data. Here, when the retransmission is determined, the HARQ entity 2706 sets NDI information indicating that HARQ data is retransmitted data to HARQ data to be retransmitted.

The MAC CE generator 2710 generates a TA command MAC CE based on the backward timing offset value provided from the backward timing controller 2704 and provides the TA command MAC CE to the MAC combination and multiplexer 2708. In particular, according to the present invention, the MAC CE generation unit 2710 adds a serial number to the TA command MAC CE, as shown in FIG. 6, so that the terminal receiving the duplicated process does not process the TA command MAC CE. May be induced.

The MAC combination and multiplexer 2708 combines and multiplexes the MAC CEs provided from the MAC CE generation unit 2710 and the MAC SDU data received from an upper layer device.

The upper layer device 2712 refers to a device for generating data to be transmitted and received by the terminal through a wireless channel of LTE. The higher layer device includes an application of the terminal or a control message processing device.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating the structure of an LTE system;

2 is a diagram illustrating a procedure for performing backward transmission timing synchronization using a TA command MAC CE in an LTE system;

3 is a diagram illustrating a signal flow for determining and processing a duplicate phenomenon of a MAC PDU using a serial number in an LTE system according to an embodiment of the present invention;

4 is a diagram illustrating an operation procedure of a terminal for determining and processing a duplicate phenomenon of a MAC PDU using a serial number in an LTE system according to an embodiment of the present invention;

5 is a diagram illustrating an operation procedure of a base station for generating and transmitting a MAC PDU including a serial number in an LTE system according to an embodiment of the present invention;

6 illustrates a TA command MAC CE structure in an LTE system according to an embodiment of the present invention;

7 is a diagram illustrating a signal flow for determining and processing overlapping phenomenon of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention;

8 is a diagram illustrating an operation procedure of a terminal for determining and processing a duplication phenomenon of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention;

9 to 12 are diagrams illustrating an operation procedure of determining and processing duplication of MAC PDUs using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention;

13 to 15 are diagrams illustrating an operation procedure of determining and processing duplication of MAC PDUs using HARQ information in a terminal of an LTE system according to a second embodiment of the present invention;

16 to 19 are diagrams illustrating an operation procedure of determining and processing duplication of MAC PDUs using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention;

20 to 22 are diagrams illustrating an operation procedure of determining and processing a duplicate phenomenon of a MAC PDU by using HARQ information in a terminal of an LTE system according to a fourth embodiment of the present invention;

23 to 25 are diagrams illustrating an operation procedure of determining and processing a duplicate phenomenon of a MAC PDU using HARQ information in a terminal of an LTE system according to a fifth embodiment of the present invention;

26 is a view showing a block configuration of a terminal in an LTE system according to the present invention, and

27 is a block diagram of a base station in an LTE system according to the present invention;

Claims (4)

In the mobile communication system, a method of operating a terminal according to data redundancy retransmission, Receiving a MAC PDU from a base station, Determining whether the MAC PDU includes a control signal of a MAC layer for correcting backward timing synchronization; And if the control signal of the MAC layer is included, determining that the control signal of the MAC layer is repeatedly received using a serial number of the control signal of the MAC layer. A method of operating a base station for data retransmission in a mobile communication system, Generating a control signal of a MAC layer including a serial number when an event for correcting backward timing synchronization of a terminal occurs; Generating a MAC PDU including the control signal of the MAC layer and transmitting the generated MAC PDU to a corresponding terminal. In the device of the terminal according to data redundancy retransmission in the mobile communication system, A receiving unit for receiving the MAC PDU from the base station, It is determined whether the MAC PDU includes a control signal of a MAC layer for correcting backward timing synchronization, and if the control signal of the MAC layer is included, the MAC PDU is determined using a serial number of a control signal of the MAC layer. And a control unit for determining whether the control signal of the layer is repeatedly received. In the apparatus of the base station according to the data redundancy retransmission in the mobile communication system, A MAC control signal generation unit for generating a control signal of a MAC layer including a serial number when an event for correcting backward timing synchronization of a terminal is generated; A MAC generator for generating a MAC PDU including the control signal of the MAC layer; And an HARQ entity for controlling the MAC PDU to be transmitted to the corresponding UE according to an HARQ procedure.

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