KR101645304B1 - Apparatus and method for operating duplication harq in mobile communication system - Google Patents

Abstract

The present invention relates to a method and apparatus for performing data redundancy retransmission in a mobile communication system, and a method of a terminal for data redundancy retransmission. Storing a MAC PDU received from a base station in a soft buffer; decoding the MAC PDU; determining whether the decoding is a first case of successfully decoding data of a corresponding soft buffer; Determining whether to transmit the decoded MAC PDU to an upper layer according to a result of the determination, determining whether the UE receives the MAC PDUs redundantly, It is possible to prevent reverse timing synchronization from being corrupted, and to transmit more reliable reverse data and signals.

LTE (Long Term Evolution), TA (Timing Advance), HARQ (Hybrid Automatic Repeat reQuest)

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for performing redundancy retransmission in a mobile communication system,

The present invention relates to a method and apparatus for data redundancy retransmission in a mobile communication system. More particularly, in a LTE (Long Term Evolution) system supporting HARQ, a mobile station transmits an ACK for downlink data, And when the retransmission of the downlink data occurs, the terminal determines that the downlink data is redundantly retransmitted, thereby preventing duplication of the corresponding data.

The Universal Mobile Telecommunication Service (UMTS) system is based on Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), which are European mobile communication systems, and includes a Wideband Code Division Multiple Access (CDMA) Is a third generation asynchronous mobile communication system.

In the 3rd Generation Partnership Project (3GPP), which is in charge of standardization of the UMTS system, a discussion on LTE (Long Term Evolution) is underway as a next generation mobile communication system of the UMTS system. LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps, and aims at commercialization in about 2010, and various measures are being discussed. For example, it is discussed how to reduce the number of nodes located on the communication path by simplifying the structure of the network, or approaching wireless protocols to the wireless channel as much as possible.

Figure 1 shows the structure of an LTE system.

1, an Evolved Radio Access Network (E-RAN) 110 and 112 includes a next generation base station (ENB) 120 to 128 and an access gateway ) 130 and 132. A user equipment (UE) 101 connects to the Internet Protocol (IP) network by the E-RANs 110 and 112. [ The ENBs 120 to 128 are connected to the UE 101 through a radio channel and perform a more complex role than the existing Node Bs.

In the LTE system, a MAC (Media Access Control) control is performed for a control signal which is higher in reliability than a control signal of a physical layer and is required to be processed more quickly than a control signal of a radio link control (RLC) ) Layer control signal, i.e., a MAC control element (MAC). For example, in the LTE system, a Timing Advance (TA) Command MAC CE, which is a control signal of the MAC layer, is used to match uplink transmission timing synchronization.

2 shows a procedure for performing uplink transmission timing synchronization using a TA command MAC CE in an LTE system.

Referring to FIG. 2, the base station (ENB) 202 generates a sounding reference signal (SRS) or a demodulation reference signal (DMRS) transmitted from the terminal 200 in step 210 If it is determined that it is necessary to correct the uplink timing offset as a result of measuring the uplink timing offset after the measurement of the uplink timing offset, or if it is determined that it is necessary to update the TA timer, To the terminal (200). Thereafter, the MS 200 adjusts the uplink timing synchronization with the BS using the TA command received in step 214, and generates an uplink channel (PUCCH, PUSCH) and a downlink channel on the basis of the uplink timing corrected by the TA command And transmits a reverse signal.

On the other hand, in the LTE system, when the UE transmits an ACK for downlink HARQ data but the base station determines that the uplink HARQ data is a NACK or does not receive the ACK, the UE retransmits the downlink HARQ data, ) May occur. However, the conventional LTE system does not provide a technique of detecting duplicate data reception in the MAC layer. Accordingly, when the MAC PDU previously received and decoded normally is redundantly received, the UE performs an unnecessary operation to re-process the redundantly received MAC PDU, resulting in a system error. For example, when the MAC PDU including the Timing Advance Command MAC CE is received redundantly, the UE does not recognize the MAC PDU, and retransmits the reverse timing synchronization with the base station using the TA command received redundantly, Thereby causing an error that may impair the transmission timing synchronization.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for retransmission of data in a mobile communication system.

It is another object of the present invention to provide a method and apparatus for preventing duplication of previously processed MAC PDUs by determining whether duplicate MAC PDUs are received in an LTE (Long Term Evolution) system supporting HARQ.

It is still another object of the present invention to provide a method and apparatus for preventing a timing synchronization from being damaged due to redundant retransmission of data by adding a serial number to a control signal (TA command MAC CE) of a MAC layer for backward timing synchronization in an LTE system .

It is still another object of the present invention to provide a method and apparatus for preventing data redundancy processing using HARQ related information of a MAC PDU including a MAC command control signal (TA command MAC CE) for reverse 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 by using success or failure of decoding of HARQ soft buffer data in an LTE system.

According to a first aspect of the present invention, there is provided a method of operating a UE according to data redundancy retransmission in a mobile communication system, the method comprising: storing a MAC PDU received from a base station in a soft buffer; Determining whether the decoding is the first case in which the decoding is successfully decoded on the data of the corresponding soft buffer, and determining whether to forward the decoded MAC PDU to an upper layer according to the determination result .

According to a second aspect of the present invention, there is provided an apparatus of a UE according to data redundancy retransmission in a mobile communication system, comprising: a soft buffer for storing a MAC PDU received from a base station; And a controller for determining whether the decoding is the first case in which the data of the corresponding soft buffer is successfully decoded and determining whether to transmit the decoded MAC PDU to an upper layer according to the determination result .

According to a third aspect of the present invention, there is provided a method of retransmitting data in a mobile communication system, the method comprising the steps of: receiving an MAC PDU; receiving, by the MAC PDU, Determining whether the control signal is included in the control signal, and determining whether the control signal is redundantly received using the serial number of the control signal when the control signal is included.

According to a fourth aspect of the present invention, there is provided a method of a base station for data redundancy retransmission in a mobile communication system, comprising the steps of: generating, when an event for correcting uplink timing synchronization of a mobile station is generated, Generating a MAC PDU including the control signal, and transmitting the generated MAC PDU to the corresponding terminal.

According to the present invention, in the LTE (Long Term Evolution) system, the UE determines whether the MAC PDU is duplicated, and prevents unnecessary MAC PDUs from being duplicated. Thus, it is possible to eliminate unnecessary operations, It is possible to transmit more reliable reverse data and signals.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a method and apparatus for preventing duplication of previously handled MAC PDUs by determining whether a UE receives a duplication of a MAC PDU in an LTE (Long Term Evolution) system supporting HARQ, I will explain. Here, if the UE transmits an ACK for the MAC PDU but the BS determines that the ACK is a NACK or does not receive the ACK and retransmits the MAC PDU, the MAC PDU is duplicated so that the UE receives the MAC PDU redundantly. Development "

In the present invention, if a MAC PDU including the TA Command MAC CE is added with a serial number to a Timing Advance (TA) Command MAC CE, which is a MAC layer control signal for reverse timing synchronization, TA Command A technique for preventing MAC CE from being duplicated will be described.

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

Referring to FIG. 3, in step 310, the UE 300 transmits a sounding reference signal (SRS) or a demodulation reference signal (DMRS) using resources allocated by the base station (ENB) : DeModulation Reference Signal) to the base station 302. In step 312, the BS 302 checks the uplink timing offset using the SRS or the DMRS of the MS, determines whether the uplink timing offset needs to be corrected, and if it is necessary to correct the uplink timing offset, And generates a TA command MAC CE including a sequence number (SN). As shown 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 denotes a serial number, and R denotes 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) can be used as a serial number. If a 1-bit serial number is used, Either SN1 or R (601, 603) may be used as the bit for the serial number and the other as the bit for the reserved information.

The terminal 300 receiving the TA command MAC CE checks the serial number included in the TA command MAC CE in step 314 and compares the serial number with the serial number of the previously received TA command MAC CE, TA command It is judged that there is no overlapping phenomenon for MAC CE, and the received TA command is applied to correct the reverse timing. In step 316, the MS 300 transmits an ACK to the BS 302 to indicate that the TA command MAC CE is successfully received.

However, if the ACK is determined to be NACK in the BS 302, the BS 302 retransmits the MAC PDU including the TA command MAC CE including the serial number to the MS 300 in step 318 . At this time, upon 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 with the serial number of the previously received TA command MAC CE If the two serial numbers are the same, it is determined that duplication of the TA command MAC CE has occurred, and the TA command MAC CE is discarded without processing.

FIG. 4 illustrates an operation procedure of a UE for determining and processing redundancy of a MAC PDU using a sequence number in an LTE system according to an embodiment of the present invention.

4, the MS transmits a sounding reference signal SRS or a demodulation reference signal DMRS to the BS in step 401 and receives an MAC PDU from the BS in step 403. In step 403,

In step 405, the MS determines whether a TA command MAC CE is included in the MAC PDU. Here, whether or not the TA command MAC CE is included can be confirmed through a logical channel ID of a MAC header. If the TA command MAC CE is not included in the MAC PDU, the MS proceeds to step 407 to process the content of the MAC PDU, and then returns to step 403 according to the present invention.

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 sequence number included in the TA command MAC CE, and transmits the sequence number and the previously received TA command MAC CE The serial numbers are compared to determine whether the two serial numbers are the same. Here, when the TA command MAC CE is received for the first time, since there is no previously received serial number, the terminal can determine that the serial numbers are not identical. In addition, the terminal may preset the serial number not used by the base station as an initial serial number so that the two serial numbers may not be the same when the TA command MAC CE is received for the first time.

If the two serial numbers are identical, the terminal determines in step 415 that a duplication of the MAC PDU including the TA command MAC CE is generated, and discards the received TA command MAC CE. Thereafter, the terminal proceeds to step 407. In step 407,

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

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

5, the BS receives a sounding reference signal SRS or a demodulation reference signal DMRS from the UE in step 501, and then, in step 503, receives a reverse timing offset using the received SRS or DMRS . In step 505, the BS determines whether the correction of the backward timing offset is necessary. If the correction is not necessary, the BS generates and transmits an MAC PDU in step 507 and terminates the algorithm according to the present invention.

On the other hand, if it is necessary to correct the backward timing offset, the base station increments the sequence number according to the present invention in step 509 and checks whether the increased sequence number is greater than a predetermined maximum value in step 511. If the increased serial number is greater than the preset maximum value, the base station initializes the serial number in step 515, and then proceeds to step 513. At this time, the serial number is initialized to a predetermined minimum value.

 If the increased serial number is not greater than the preset maximum value, the base station generates a TA command MAC CE including the increased sequence number in step 513, and then transmits the generated TA command MAC CE in step 507 And transmits the generated MAC PDU to the UE, and terminates the algorithm according to the present invention.

As shown in FIGS. 3 to 6, according to the present invention, it is possible to prevent the TA command MAC CE from being redundantly processed by using the serial number, thereby preventing the backward timing synchronization from being damaged and transmitting more reliable reverse data and signals .

A description will now be made of a technique for preventing the TA Command MAC CE from being redundantly processed by using the HARQ related information for the MAC PDU when a duplication occurs in a MAC PDU including a 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 includes information indicating whether data of the HARQ soft buffer is successfully decoded first, information indicating whether initial decoding is successfully performed after initial transmission of HARQ data, soft buffer update information, New data indicator (NDI) information, whether decoding of previously received data is successful, and size information of previously received data and currently received data.

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

Referring to FIG. 7, the ENB 702 transmits downlink HARQ data to the UE 700 in step 710. At this time, the TA command MAC CE for correcting the reverse timing synchronization may be included in the forward HARQ data. In step 712, the MS 700 having received the downlink HARQ data transmits an ACK to the BS 702 to indicate that the downlink HARQ data has been successfully received.

However, if the base station 702 determines that the ACK is NACK, the BS 702 retransmits the downlink HARQ data in step 714. At this time, the BS may include New Data Indicator (NDI) information in the retransmitted forward HARQ data to indicate that the corresponding MAC PDU is retransmission data. That is, the NDI information is information indicating whether the currently transmitted packet data is packet data to be initially transmitted or packet data to be retransmitted. If the NDI information is 0, the packet data is initially transmitted, and the NDI information Quot; 1 " may indicate that the packet data is retransmitted. Or an initial transmission or retransmission due to an increase or an increase in the NDI value or an initial transmission or retransmission due to an increase or decrease in the NDI value, indicates an initial transmission of the packet data if the NDI value is different from the previous value or increases. If the NDI information is the same as the previous value, Lt; / RTI > In this case, even if the NDI has the same value, it can be determined that the packet data is initially transmitted if the size of the transmitted data is different.

In step 716, the MS 700 determines whether the downlink HARQ data is redundant based on HARQ related information on the retransmitted downlink HARQ data. A method of determining whether a downlink phenomenon occurs in the forward HARQ data is a method of determining whether the data of the HARQ soft buffer is successfully decoded or not, a method of determining whether the HARQ data is initially transmitted, A method of confirming whether data is successfully decoded or not, a method of confirming whether or not the data of the HARQ soft buffer has been replaced or combined with the currently received data or whether the received data has been retransmitted, A method may be used in which the data of the buffer is successfully decoded and the size of the currently received data is equal to the size of the previous data. Herein, if there is a duplication, the MS 700 discards the TA command MAC CE included in the downlink HARQ data without processing, and if the duplication occurs, the MS 700 discards the downlink HARQ data It processes the included TA command MAC CE to adjust the reverse timing synchronization.

In step 718, the MS 700 transmits an ACK to the BS 702.

FIG. 8 illustrates an operation procedure of a UE for determining and processing duplication of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention.

Referring to FIG. 8, in step 801, the MS transmits a sounding reference signal SRS or a demodulation reference signal DMRS to a BS. In step 803, the MS receives HARQ data, i.e., a MAC PDU, from the BS.

In step 805, the MS determines whether the HARQ data has been duplicated based on HARQ related information of the received HARQ data, and stores the result. A method of determining whether or not the HARQ data has been duplicated is a method of determining whether data of a HARQ soft buffer is successfully decoded first, a method of determining whether HARQ data is initially transmitted, A method of confirming through success or not, a method of confirming whether or not the data of the HARQ soft buffer is updated by being replaced or combined with the currently received data, It is possible to use a method of verifying whether the data of the soft buffer has been successfully decoded and the size of the currently received data is equal to the size of the previous data. Hereinafter, a method for determining whether or not the HARQ data has been duplicated will be described in detail with reference to FIGS. 9 to 25.

In step 807, the terminal determines whether a TA command MAC CE is included in the MAC PDU. Here, whether or not the TA command MAC CE is included can be confirmed through a logical channel ID of the MAC header. If the TA command MAC CE is not included in the MAC PDU, the MS proceeds to step 809 and processes the content of the MAC PDU. Then, the MS returns to step 803 according to the present invention and performs the following steps again.

If the TA command MAC CE is included in the MAC PDU, the MS proceeds to step 811 to check whether the stored duplication occurs.

If the occurrence of the duplication is confirmed, 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, if it is confirmed that the overlapping phenomenon does not occur, the MS performs reverse timing synchronization by applying the TA command included in the TA command MAC CE of the MAC PDU in step 813, and proceeds to step 809, .

Herein, the UE does not determine whether to apply or discard the TA command according to whether the HARQ is duplicated or not, but performs the operation in step 809, i.e., processing the contents of the remaining MAC PDUs Which will be described in detail below with reference to FIGS. 9 to 25.

Hereinafter, with reference to FIGS. 9 to 25, a method for determining whether a HARQ related data is duplicated using a HARQ related information, and a method for processing corresponding HARQ data Will be described in detail.

Referring to FIGS. 9 to 12, a method for determining whether a HARQ data is duplicated using a decoding result of HARQ data and a size of the HARQ data and processing the HARQ data will be described below.

FIG. 9 illustrates an operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of an LTE system according to the first embodiment of the present invention.

Referring to FIG. 9, the UE receives forward link HARQ data from a Node B in step 901 and checks HARQ information in step 903. FIG. Here, the HARQ information includes NDI information indicating whether the currently transmitted data is initial transmission data or retransmitted data.

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

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

If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the soft buffer of the corresponding HARQ in step 917 to improve the decoding success rate of the data , The flow advances to step 909. [ On the other hand, if the previous data of the corresponding HARQ is decoded successfully, the MS proceeds to step 923 and checks whether the previous data of the corresponding HARQ and the received data have the same size.

If the previous data of the HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 925, Data is replaced with the soft buffer of the corresponding HARQ and stored, and then the procedure goes to step 909. [

On the other hand, if the size of the previous data of the HARQ is equal to the size of the received data, the terminal determines that duplication of the received data occurs, and proceeds to step 927 to discard the received data, The UE proceeds to step 921 and generates an ACK for the corresponding HARQ data and transmits it to the base station. As described above, in the present invention, it is possible to omit the process of decoding the data in which the duplication occurs, and it is possible to prevent additional operations and malfunctions due to the duplication. Here, the step of discarding the received data in operation 921 may be omitted.

In step 909, the UE decodes the data in the soft buffer, and proceeds to step 911 to check whether the decoding is successful. If the decoding is successful, the MS proceeds to step 919 and transfers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or an upper layer. In step 921, And transmits the generated ACK to the base station.

On the other hand, if the decoding fails, the UE generates a NACK for the HARQ data in step 913 and transmits the NACK to the BS.

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

9, if the retransmitted data is not successfully decoded previously but the data size is different, i.e., the retransmitted data is different from the previous data, the retransmitted data is the data in the previous soft buffer And can be decoded. Therefore, in FIGS. 10 to 12, various operation procedures of the terminal for overcoming the above disadvantages will be described.

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

Referring to FIG. 10, the UE receives forward link HARQ data from a Node B in step 1001 and checks HARQ information, i.e., NDI information, in step 1003. FIG.

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

On the other hand, if the received data is retransmission data, the MS proceeds to step 1015 and checks whether the previous data of the HARQ and the received data have the same size. If the size of the previous data of the HARQ is not equal to the size of the received data, the terminal determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1017, And stores the replaced data in the soft buffer of the corresponding HARQ, and then proceeds to step 1009. [

On the other hand, if the previous data of the HARQ and the received data have the same size, the MS proceeds to step 1023 and checks whether the previous data of the corresponding HARQ is successfully decoded. If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the corresponding 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 HARQ data has been successfully decoded, the UE determines that the received data has been duplicated, proceeds to step 1027, discards the received data, The BS proceeds to step 1021 to generate an ACK for the HARQ data and transmits the generated ACK to the BS.

In step 1009, the UE decodes the data in the soft buffer, and proceeds to step 1011 to check whether the decoding is successful. If the decoding is successful, the MS proceeds to step 1019 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or an upper layer. In step 1021, And transmits the generated ACK to the base station.

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

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

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

Referring to FIG. 11, the UE receives forward link HARQ data from the Node B in step 1101 and checks HARQ information, i.e., NDI information, in step 1103. FIG.

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

If the received data is initial transmission data other than retransmission data, the MS replaces the received data with a corresponding soft buffer of the HARQ in step 1107, and then proceeds to step 1109. [ On the other hand, if the received data is the retransmission data, the MS proceeds to step 1115 and checks whether the previous data of the HARQ is successfully decoded.

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

If the previous data of the HARQ and the size of the received data are not the same, the UE determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1125, Data is replaced with the soft buffer of the corresponding HARQ and stored, and then the procedure goes to step 1109. [

On the other hand, if the size of the previous data of the HARQ is equal to the size of the received data, the MS proceeds to step 1127 and determines whether duplication of the received data occurs. Herein, the UE determines whether the data of the HARQ soft buffer is successfully decoded in the first case, determines whether the data is successfully decoded after the initial transmission of the HARQ data, Or whether the received data has been retransmitted and that the data of the soft buffer has been successfully decoded and the size of the currently received data is the same as the previous data It is possible to determine whether or not the occurrence of the overlapping phenomenon occurs. If it is determined that the overlapping phenomenon does not occur, the terminal proceeds to step 1109, and if it is determined that the overlapping phenomenon occurs, the terminal proceeds to step 1129 to discard the received data, The BS proceeds to step 1121 to generate an ACK for the HARQ data and transmits the ACK to the BS.

The UE then decodes the data in the soft buffer in step 1109 and proceeds to step 1111 to check whether the decoding is successful. If the decoding is successful, the MS proceeds to step 1119 and transmits the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or an upper layer. In step 1121, And transmits the generated ACK to the base station.

On the other hand, if the decoding fails, the UE generates a NACK for the HARQ data in step 1113 and transmits the NACK to the BS.

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

FIG. 12 illustrates another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the first embodiment of the present invention. Here, the UE performs an operation entirely similar to that of FIG. 11, so that detailed description thereof 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 a soft buffer, and the data is decoded in the soft buffer. In FIG. 12, The method proceeds to step 1225 where it is determined whether the received data has been duplicated or not, instead of proceeding to step 1209 in which data of the soft buffer is decoded.

In the first embodiment described with reference to FIGS. 9 to 12, it is determined that duplication of the received data occurs, thereby preventing additional decoding, thereby omitting unnecessary operations. However, in the conventional system, Unlike the HARQ operation, an unusual operation occurs in which an ACK is transmitted without decoding the corresponding soft buffer data of the retransmitted data. 13 to 15, operation procedures for preventing the MAC PDU from being duplicated while maintaining the HARQ operation of the existing system will be described. 13 to 15, when it is determined that a duplication of the received data occurs, the decoded MAC PDU is delivered to the corresponding MAC disassembly and demultiplexing entity or to an upper layer Let's take a look at techniques to prevent this.

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

Referring to FIG. 13, the UE receives forward link HARQ data from a Node B in step 1301 and checks HARQ information, i.e., NDI information, in step 1303. FIG. In step 1305, the MS determines whether the received data is retransmitted data based on the HARQ information.

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

If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the corresponding soft buffer of the HARQ in step 1317 to improve the decoding success rate of the data , And then proceeds to step 1309. FIG. On the other hand, if the previous data of the HARQ is successfully decoded, the UE proceeds to step 1321 to check whether the previous data of the corresponding HARQ is equal to the received data.

If the previous data of the HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1323, Data is replaced with the soft buffer of the corresponding HARQ, and the process proceeds to step 1309. [

On the other hand, if the size of the previous data of the HARQ is equal to the size of the received data, the terminal determines that duplication of the received data occurs, and proceeds to step 1329 to discard the received data, The process proceeds to step 1309, without storing it in the buffer.

The UE then decodes the data in the soft buffer in step 1309 and proceeds to step 1311 to check whether the decoding is successful. If the decoding fails, the UE generates a NACK for the HARQ data in step 1313 and transmits the NACK to the BS.

On the other hand, if the decoding is successful, the UE proceeds to step 1319 and determines whether the decoded data is duplicated data. Herein, the UE determines whether the data of the HARQ soft buffer is successfully decoded in the first case, determines whether the data is successfully decoded after the initial transmission of the HARQ data, Or whether the received data has been retransmitted and that the data of the soft buffer has been successfully decoded and the size of the currently received data is the same as the previous data It is possible to determine whether or not the occurrence of the overlapping phenomenon occurs.

If it is determined that the decoded data is data in which no duplication has occurred, the UE proceeds to step 1325 and transmits the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity, The BS proceeds to step 1327. If it is determined that the decoded data is data in which duplication occurs, the BS proceeds directly to step 1327 to generate an ACK for the HARQ data and transmits the generated ACK to the BS.

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

Referring to FIG. 13, when the retransmitted data is not successfully decoded previously but the data size is different, i.e., when the retransmitted data is different from the previous data, the retransmitted data is the data in the previous soft buffer And can be decoded by combining the two. Therefore, various operation procedures of the terminal for overcoming the above-mentioned disadvantages will be described below with reference to FIGS.

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

Referring to FIG. 14, the UE receives forward link HARQ data from the Node B in step 1401 and checks HARQ information, i.e., NDI information, in step 1403. FIG. In step 1405, the MS determines whether the received data is retransmitted based on the HARQ information.

If the received data is initial transmission data other than retransmission data, the MS replaces the received data with a corresponding soft buffer of the HARQ in step 1407, and then proceeds to step 1409. On the other hand, if the received data is retransmission data, the MS proceeds to step 1415 to check whether the previous data of the corresponding HARQ and the received data have the same size. If the previous data of the corresponding HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1417, Data is replaced with the soft buffer of the corresponding HARQ and stored, and then the process proceeds to step 1409. [

On the other hand, if the previous data of the HARQ and the received data have the same size, the MS proceeds to step 1421 to check whether the previous data of the HARQ is successfully decoded. If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the soft buffer of the corresponding HARQ in step 1423 and stores it in step 1423 to improve the decoding success rate of the data , And then proceeds to step 1409. FIG. If the previous data of the corresponding HARQ is successfully decoded, the UE determines that the received data has been duplicated. In step 1429, the UE discards the received data and stores it in the soft buffer And proceeds to step 1409. [

In step 1409, the UE decodes the data in the soft buffer, and proceeds to step 1411 to check whether the decoding is successful. If the decoding fails, the MS generates a NACK for the HARQ data in step 1413 and transmits the NACK to the BS.

On the other hand, if the decoding is successful, the UE proceeds to step 1419 and determines whether the decoded data is data in which duplication occurs. Herein, the UE determines whether the data of the HARQ soft buffer is successfully decoded in the first case, determines whether the data is successfully decoded after the initial transmission of the HARQ data, Or whether the received data has been retransmitted and that the data of the soft buffer has been successfully decoded and the size of the currently received data is the same as the previous data It is possible to determine whether or not the occurrence of the overlapping phenomenon occurs.

If it is determined that the decoded data is data in which no duplication has occurred, the UE proceeds to step 1425 to transmit the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity, And proceeds to step 1427. If it is determined that the decoded data is data in which duplication occurs, the UE proceeds directly to step 1427 to generate an ACK for the HARQ data, and transmits the generated ACK to the base station.

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

FIG. 15 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the second embodiment of the present invention. Herein, since the UE performs an operation similar to that of FIG. 13, the detailed description of the operation will be omitted. 15, the UE combines the received data with the previous data stored in the soft buffer and stores the combined data in step 1517. However, the UE proceeds to step 1521 without decoding the data of the soft buffer It is judged whether or not the size of the received data is equal to the size of the previously received data.

Hereinafter, referring to FIGS. 16 to 19, it will be assumed that the retransmission data is processed as in the operation of the existing system, and that a MAC disassembly and demultiplexing entity or an upper A technique for preventing a malfunction or an additional operation of a MAC PDU in which a duplication occurs is provided.

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

16, the MS receives the forward link HARQ data from the BS in step 1601, checks the HARQ information, i.e., the NDI information, in step 1603, and generates a duplication indicator for indicating whether the MAC PDU of the corresponding HARQ is duplicated a duplication indicator (hereinafter referred to as " dup_ind ") is applied and initialized.

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

If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the corresponding soft buffer of the HARQ in step 1617 and stores it in step 1617 to improve the decoding success rate of the data , And proceeds to step 1609 below. On the other hand, if the previous HARQ data has been successfully decoded, the UE proceeds to step 1623 and checks whether the previous HARQ data is the same as the received data.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1625, Data is replaced with the soft buffer of the corresponding HARQ and stored, and then the process proceeds to step 1609. [

On the other hand, if the size of the previous data of the HARQ is equal to the size of the received data, the terminal determines that duplication of the received data occurs, and proceeds to step 1627 to discard the received data. (Dup_ind) initialized in step 1609, and then proceeds to step 1609. In step 1609,

In step 1609, the terminal decodes the data in the soft buffer, and proceeds to step 1611 to check whether the decoding is successful. If the decoding is successful, the MS proceeds to step 1619 and transmits the decoded MAC PDU and the set duplication indicator to a corresponding MAC disassembly and demultiplexing entity or an upper layer, An ACK for the HARQ data is generated and transmitted to the base station. Herein, when the MAC disassembly and demultiplexing entity or the upper layer which received the MAC PDU confirms the duplication indicator (dup_ind) and is set to a value indicating duplication, the MAC PDU is discarded .

On the other hand, if the decoding fails, the UE generates a NACK for the HARQ data in step 1613 and transmits the NACK to the BS.

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

17 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the third embodiment of the present invention. Herein, since the UE performs an operation similar to that of FIG. 16, the detailed description of the operation will be omitted. In FIG. 16, if the decoding of the previous received data is successful, if the decoding is successful, the size of the previous received data is compared with the size of the current received data. In FIG. 17, And determines whether decoding of the previous received data is successful.

18 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the third embodiment of the present invention.

Referring to FIG. 18, the UE receives forward link HARQ data from the Node B in step 1801, checks HARQ information, i.e., NDI information, in step 1803, and generates a duplication indicator for indicating whether the MAC PDU of the corresponding HARQ is duplicated a duplication indicator (hereinafter referred to as " dup_ind ") is applied and initialized.

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

If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the corresponding soft buffer of the HARQ in step 1817 and stores the result in the buffer in step 1817 , And proceeds to step 1823 described below. On the other hand, if the previous data of the HARQ is decoded successfully, the MS proceeds to step 1823 and checks whether the previous data of the corresponding HARQ and the received data have the same size.

If the previous data of the corresponding HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 1825, Data is replaced with the soft buffer of the HARQ and stored, and then the procedure goes to step 1809. [

On the other hand, if the previous data of the corresponding HARQ and the received data have the same size, the terminal determines whether duplication of the received data occurs in step 1827. [ Herein, the UE determines whether or not the data of the HARQ soft buffer is successfully decoded in the first case, determines whether the data is successfully decoded after the initial transmission of the HARQ data, A method of confirming whether the received data is replaced or combined with the currently received data, or a method in which the received data is retransmitted and the data of the soft buffer has been successfully decoded and the size of the currently received data is equal to the size of the previous data It is possible to determine whether or not the duplication phenomenon occurs by using a method of comparing and confirming.

If it is determined that the duplication has not occurred, the terminal proceeds to step 1809 and proceeds to step 1829 to discard the received data. In step 1831, dup_ind), and then proceeds to step 1809 described below.

In step 1809, the terminal decodes the data in the soft buffer, and proceeds to step 1811 to check whether the decoding is successful. If the decoding is successful, the MS proceeds to step 1819 and transmits the decoded MAC PDU and the set duplication indicator to the corresponding MAC disassembly and demultiplexing entity or an upper layer, An ACK for the HARQ data is generated and transmitted to the base station. Herein, when the MAC disassembly and demultiplexing entity or the upper layer which received the MAC PDU confirms the duplication indicator (dup_ind) and is set to a value indicating duplication, the MAC PDU is discarded .

On the other hand, if the decoding fails, the UE generates a NACK for the HARQ data in step 1813 and transmits the NACK to the BS.

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

FIG. 19 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the third embodiment of the present invention. Herein, since the UE performs an operation similar to that of FIG. 18, the 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 the data is decoded in the soft buffer. In FIG. 19, The soft buffer is replaced with the soft buffer and the soft buffer is decoded. Instead of proceeding to step 1909, it is determined in step 1927 whether a duplication of the received data has occurred.

Next, referring to FIGS. 20 to 22, the retransmission data is processed as in the operation of the existing system, and the MAC disassembly and demultiplexing entity or the upper layer is notified that the soft buffer has been updated, Hereinafter, a technique for preventing a malfunction or an additional operation of a MAC PDU in which a phenomenon occurs is described.

FIG. 20 illustrates an operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of an LTE system according to the fourth embodiment of the present invention.

Referring to FIG. 20, the UE receives forward link HARQ data from the BS in step 2001, checks HARQ information, i.e., NDI information, in step 2003, and generates a soft buffer update indicator (soft buffer update indicator, hereinafter referred to as " buffer_update_ind "). At this time, the initial value of the soft update indicator indicates that the soft buffer is not updated.

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

If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with previous data in the soft buffer of the corresponding HARQ in step 2017 to improve the decoding success rate of the data, After setting the soft buffer update indicator (buffer_update_ind), proceed to step 2009 below. On the other hand, if the previous data of the HARQ is decoded successfully, the MS proceeds to step 2023 and checks whether the previous data of the corresponding HARQ and the received data have the same size.

If the previous data of the 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. In step 2025, And stores the replaced data in the soft buffer of the corresponding HARQ, and sets the soft buffer update indicator (buffer_update_ind).

On the other hand, if the previous data of the corresponding HARQ and the received data have the same size, the terminal determines that the received data has been duplicated, proceeds to step 2027, discards the received data, It is not stored in the buffer, but proceeds to step 2009 below.

The UE then decodes the 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 MS proceeds to step 2019 and transfers the decoded MAC PDU and the set soft buffer update indicator (buffer_update_ind) to a corresponding MAC disassembly and demultiplexing entity, In step 2021, an ACK for the HARQ data is generated and transmitted to the BS. Herein, the M MAC disassembly and demultiplexing entity or the upper layer which has received the MAC PDU can 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 UE generates a NACK for the HARQ data in step 2013 and transmits the NACK to the BS.

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

FIG. 21 illustrates another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the fourth embodiment of the present invention. Herein, since the terminal performs an operation similar to that of FIG. 21, the detailed description of the operation will be omitted. In FIG. 20, if the decoding of the previous received data is successful, if the decoding is successful, the size of the previous received data is compared with the size of the current received data. However, in FIG. 21, And determines whether decoding of the previous received data is successful.

FIG. 22 illustrates another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the fourth embodiment of the present invention. Here, the terminal performs an operation entirely similar to that of FIG. 20, so that detailed description of the operation will be omitted. In FIG. 20, if decoding of the previous HARQ data fails, the received data is combined with previous data stored in the soft buffer and stored, and after setting the soft buffer update indicator, the data of the soft buffer is decoded 22, the received data is combined with previous data stored in the soft buffer and stored, and after the step 2217 of setting the soft buffer update indicator, the process proceeds to step 2223 instead of step 2209 And determines whether the previous data and the currently received data have the same size.

23 to 25, when the data in the soft buffer is updated, decoding is performed, and only when the decoding is successful, the MAC PDU is divided into an MMAC disassembly and demultiplexing entity or an upper layer A technique for preventing a malfunction or an additional operation of a MAC PDU in which a duplication has occurred will be described.

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

Referring to FIG. 23, the UE receives forward link HARQ data from the Node B in step 2301 and checks HARQ information, i.e., NDI information, in step 2303. FIG. In step 2305, the MS determines whether the received data is retransmitted data based on the HARQ information.

If the received data is initial transmission data that is not retransmission data, the MS replaces the received data with the soft buffer of the HARQ in step 2307 and stores the data in the soft buffer of the corresponding HARQ, then decodes the data in the soft buffer in step 2309, The process proceeds to step 2311. [

On the other hand, if the received data is the retransmission data, the MS proceeds to step 2317 and checks whether the previous data of the HARQ is successfully decoded. If the previous data of the corresponding HARQ is not successfully decoded, the UE combines the received data with the previous data in the soft buffer of the corresponding HARQ in step 2319 to improve the decoding success rate of the data , Decodes the data in the soft buffer in step 2021, and proceeds to step 2311. FIG. On the other hand, if the previous data of the corresponding HARQ is decoded successfully, the MS proceeds to step 2327 and checks whether the previous data of the corresponding HARQ and the received data have the same size.

If the previous data of the HARQ and the size of the received data are not the same, the MS determines that the received data is different from the previous data even if the received data is retransmitted data. In step 2329, Data is replaced with the soft buffer of the corresponding HARQ and stored, and in step 2031, the data in the soft buffer is decoded.

On the other hand, if the size of the previous data of the HARQ is equal to the size of the received data, the terminal determines that duplication of the received data occurs, and proceeds to step 2333 to discard the received data, The process proceeds to step 2311 without going through the process.

In step 2311, the MS determines whether data decoding in the current soft buffer has been successfully performed. If the decoding is successfully performed, the MS proceeds to step 2323 and delivers the decoded MAC PDU to a corresponding MAC disassembly and demultiplexing entity or an upper layer, .

On the other hand, if the decoding is unsuccessful, the UE re-examines whether the current or previous decoding has been successfully performed in step 2313. That is, if the current decoding is not successfully performed, the UE determines whether the previous valid decoding result is successful. If the current or previous decoding has been successfully performed, the UE generates an ACK for the HARQ data in step 2325 and transmits the generated ACK to the base station. If the current and previous decoding are not successfully performed, And transmits the generated NACK to the base station.

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

24 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of the LTE system according to the fifth embodiment of the present invention. Herein, since the terminal performs an operation similar to that of FIG. 23, the detailed description of the operation will be omitted. In FIG. 23, if the decoding of the previous received data is successful, if the decoding is successful, the size of the previous received data is compared with the size of the currently received data. In FIG. 24, And determines whether decoding of the previous received data is successful.

FIG. 25 shows another operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of an LTE system according to the fifth embodiment of the present invention. Herein, since the terminal performs an operation similar to that of FIG. 23, the detailed description of the operation will be omitted. In FIG. 23, if decoding of the previous HARQ data fails, the received data is combined with previous data stored in the soft buffer, and the data is decoded. 25, the received data is combined with the previous data stored in the soft buffer and stored, and then the data of the soft buffer is decoded. Thereafter, in step 2521, And determines whether the previous data and the currently received data have the same size.

26 shows a block configuration of a UE in the LTE system according to the present invention.

26, the UE includes a transmission / reception unit 2600, a reception control channel processing unit 2602, a HARQ soft buffer 2604, an HARQ control unit 2606, a decoder 2608, A control channel processing unit 2610, a MAC disassembly and demultiplexing entity 2612, and an upper layer apparatus 2614. [

The transceiver 2600 processes transmission and reception of a PHY channel and a signal through an LTE radio channel, a reception control channel processor 2602 processes control channel data received through a forward control channel, And transmits the analyzed information to the corresponding module, that is, the upper layer apparatus 2614, the HARQ control unit 2606, and the decoder 2608. The transmitting / receiving unit 2600 decodes the control channel, Control operation can be performed.

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

The HARQ controller 2606 controls the entire HARQ process. The HARQ control unit 2606 receives and receives HARQ related information from the reception control channel processing unit 2602. The HARQ control unit 2606 replaces the received data with the corresponding HARQ soft buffer 2604 using the HARQ related information, Data to be stored or discarded, and controls the HARQ soft buffer 2604 according to the determination. Also, the HARQ controller 2606 determines whether to decode the data of the HARQ soft buffer 2604 and controls the decoder 2608. The HARQ control unit 2606 transmits HARQ related control information to the upper layer apparatus 2614 and generates ACK / NACK information according to the decoding result of the decoder 2608 and transmits the ACK / NACK information to the transmission control channel processing unit 2610 . The HARQ controller 2606 determines whether the HARQ soft buffer 2604 is replaced with the currently received data or whether the received data is updated when the received data is retransmitted data, Determines whether the duplication occurs or not, and determines the processing of the data using the method of checking the size of the data and the previous data. Here, the HARQ controller 2606 may determine whether decoding of previous data is successful based on a decoding result provided from the decoder 2608. [

The decoder 2608 decodes the data of the corresponding HARQ soft buffer 2604 according to an instruction from the HARQ controller 2606 based on the decoding related information received from the reception control channel and outputs the result to the HARQ controller 2606. [ .

The transmission control channel processing unit 2610 is a device for processing an uplink control channel operation and receives information (e.g., ACK / NACK information and CQI information) to be transmitted on the uplink control channel from the HARQ control unit 2610, To the transceiver 2600 and transmitted to the corresponding node.

The MAC decomposition and demultiplexing unit 2612 decomposes and demultiplexes the MAC PDUs provided from the decoder 2608 based on the control signal provided from the HARQ control unit 2606 and the redundancy occurrence information. In particular, the MAC decomposition and demultiplexing unit 2612 determines whether the TA command MAC CE is duplicated according to the present invention, and determines whether the TA command MAC CE has been duplicated. Process CE. That is, the MAC disassembly and demultiplexer 2612 discards the TA command MAC CE when the duplication occurs, and if the duplication does not occur, the MAC disassembly and demultiplexer 2612 applies the TA command included in the TA command MAC CE to reverse And performs processing and control for acquiring timing synchronization. Here, the MAC decomposer / demultiplexer 2612 can determine whether a duplication of the TA command MAC CE has occurred through the serial number included in the TA command MAC CE.

The upper layer device 2614 collectively refers to a device that generates data to be transmitted / received through a wireless channel of an LTE mobile station. The upper layer device 2614 includes both an application of the terminal and a control message processing device.

FIG. 27 shows a block configuration of a base station in an LTE system according to the present invention.

27, the BS includes a transmitting / receiving unit 2700, a receiving channel and signal processing unit 2702, an inverse timing controller 2704, an HARQ entity 2706, a MAC combining and multiplexing unit 2706, (MAC assembly and multiplexing entity) 2708, a MAC CE generation unit 2710, and an upper layer device 2712.

The transceiver 2700 processes the PHY channel and the signal through the LTE radio channel,

The reception channel and signal processing unit 2702 processes the channel data and the reception signal received on the reverse channel. The reception channel and signal processor 2702 decodes and analyzes the received channel, provides the decoded channel to the upper layer apparatus 2712, processes the sounding reference signal SRS and the demodulation reference signal DMRS received from the terminal And provides the backward timing related information to the backward timing controller 2704.

The reverse timing controller 2704 measures a reverse timing offset based on the SRS or DMRS reverse timing information provided from the reception channel and the signal processor 2702 and determines whether the reverse timing offset needs to be corrected or not, And provides the MAC CE generator 2710 with a timing offset value to be corrected when it is determined that it is necessary to update the TA timer for updating.

The HARQ entity 2706 controls the forward HARQ transmission of the corresponding user and transmits the MAC PDUs provided from the MAC combining and multiplexing unit 2708 to the corresponding MS using the HARQ procedure. The HARQ entity 2706 receives the HARQ related information on the reverse reception control channel from the reception channel and the signal processing unit and decides whether to retransmit or initialize the corresponding HARQ data. If the retransmission is determined, the HARQ entity 2706 sets up NDI information indicating that the corresponding HARQ data is retransmitted to the 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 reverse timing controller 2704, and provides the TA command MAC CE to the MAC combining and multiplexing unit 2708. Particularly, according to the present invention, as shown in FIG. 6, the MAC CE generator 2710 adds a serial number to the TA command MAC CE so that the terminal receiving the TA command MAC CE does not duplicate the TA command MAC CE .

The MAC combining and multiplexing unit 2708 combines and multiplexes the MAC CEs provided from the MAC CE generating unit 2710 with the MAC SDU data received from the upper layer device.

The upper layer device 2712 collectively refers to a device that generates data to be transmitted / received through the wireless channel of the LTE. The higher layer apparatus includes an application of the terminal or a control message processing apparatus.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram showing the structure of an LTE system,

2 is a diagram illustrating a procedure for performing reverse 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 redundancy 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 UE for determining and processing a duplication of a MAC PDU using a sequence 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 sequence number in an LTE system according to an embodiment of the present invention;

6 is a diagram illustrating 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 duplication 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 UE for determining and processing a duplication of a MAC PDU using HARQ information in an LTE system according to another embodiment of the present invention.

9 to 12 illustrate an operation procedure for determining and processing duplication of MAC PDUs using HARQ information in a terminal of the LTE system according to the first embodiment of the present invention.

13 to 15 illustrate an operational procedure for 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 illustrate an operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of an LTE system according to a third embodiment of the present invention;

20 to 22 illustrate an operation procedure for determining and processing duplication of a MAC PDU using HARQ information in a terminal of an LTE system according to a fourth embodiment of the present invention,

23 to 25 illustrate an operational procedure for determining and processing duplication 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 diagram showing a block configuration of a terminal in an LTE system according to the present invention, and Fig.

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

Claims (12)

A method of a terminal for data redundancy retransmission in a mobile communication system, Receiving data from a base station, Determining whether to retransmit the received data based on a new data indicator (NDI) Determining whether decoding of the data is successful if the received data is data retransmitted by the base station; Combining the received data with data stored in a buffer when decoding of the corresponding data is unsuccessful; Decoding the combined data; Determining whether the decoding of the combined data is a first successful decoding of the corresponding data if decoding of the combined data is successful; And transmitting the decoded data to a disassembly and de-multiplexing entity when the decoding of the combined data is the first successful decoding of the corresponding data. The method according to claim 1, Changing the data stored in the buffer to the received data when the size of the received data differs from the size of the data stored in the buffer; And decoding the changed data in the buffer instead of the combined data, Determining whether the decoding of the combined data is the first successful decoding of the data,  And determining whether decoding of the changed data in the buffer is the first successful decoding of the corresponding data if the changed data in the buffer is successfully decoded. The method of claim 2, And changing the data stored in the buffer to the received data when the size of the received data is different from the size of the data stored in the buffer, And combining the received data with the data stored in the buffer, and then comparing the size of the received data with the size of the data stored in the buffer. The method according to claim 1, Storing the received data in a buffer when the received data is initial transmission data; Starting decoding of the received data; Determining whether the decoded data is the first successful decoding of the data if the received data is successfully decoded; And forwarding the decoded data to the decomposition and demultiplexing entity if the decoded data is the first successful decoding of the corresponding data. An apparatus of a terminal for data redundancy retransmission in a mobile communication system, A transceiver for receiving data from a base station, It is determined whether or not the received data is retransmitted based on a new data indicator (NDI). If the received data is data retransmitted from the BS, it is determined whether decoding of the data is successful or not If the decoding of the corresponding data is unsuccessful, combines the received data with data stored in a buffer, and decodes the combined data, and when decoding of the combined data is successful, And decodes the combined data by a disassembly and de-multiplexing entity if the decoding of the combined data is the first successful decoding of the corresponding data. And a control unit for transmitting data. The method of claim 5, If the size of the received data is different from the size of the data stored in the buffer, the controller changes the data stored in the buffer to the received data, and decodes the changed data in the buffer instead of the combined data And if the changed data in the buffer is successfully decoded, determining that decoding of the changed data in the buffer is the first successful decoding of the corresponding data. The method of claim 6, Wherein the control unit changes the data stored in the buffer to the received data when the size of the received data is different from the size of the data stored in the buffer, combines the received data with the data stored in the buffer, And compares the size of the received data with the size of the data stored in the buffer. The method of claim 5, Wherein the control unit stores the received data in a buffer and starts decoding the received data when the received data is the first transmitted data, and when the received data is successfully decoded, Determines whether the data is the first successful decoding of the data and delivers the decoded data to the decomposition and demultiplexing entity if the decoded data is the first successful decoding of the corresponding data. delete delete delete delete

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