KR20080071737A - Method and apparatus for processing retransmission protocal data unit in mobile communication system - Google Patents

Abstract

A method and an apparatus for processing a retransmission protocol data unit in a mobile communication system are provided to reduce an overhead by forming one PDU(Protocol Data Unit) with a redivided PDU and a new SN(Sequence Number). A maximum PDU calculation process is performed to calculate a maximum size of the PDU on the basis of a physical element when receiving the PDU to be retransmitted(303). A retransmitting process is performed to retransmit the PDU to a next TTI(Transmit Time Interval) according to the recalculated size of the PDU(305). The physical element includes a signal type, a permissible voltage value, and a permissible current value in a present terminal.

Description

METHOD AND APPARATUS FOR PROCESSING RETRANSMISSION PROTOCAL DATA UNIT IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a case of retransmission with a size of a conventional fixed PDU;

2 is a block diagram illustrating an apparatus for processing a PDU according to an embodiment of the present invention;

3 is a flowchart illustrating a method of processing a PDU requiring retransmission according to an embodiment of the present invention;

4 is a flowchart illustrating step 305 of FIG. 3 in detail according to an embodiment of the present invention;

5 is a flowchart showing step 305 of FIG. 3 in detail according to an embodiment of the present invention;

6 is a flowchart illustrating a retransmission method of a PDU requiring retransmission when the size of the recalculated PDU is smaller than the size of the PDU requiring retransmission according to an embodiment of the present invention;

7 is a diagram illustrating a data format of a PDU requiring retransmission when the size of the recalculated PDU is smaller than the size of the PDU requiring retransmission according to an embodiment of the present invention;

8 is a flowchart illustrating a retransmission method of a PDU requiring retransmission when the size of the recalculated PDU is larger than the size of the PDU requiring retransmission and there is an SDU to be newly transmitted.

9 is a diagram illustrating a data format of a PDU required to be retransmitted when generating a PDU for which retransmission is required and a PDU of an SDU to be newly transmitted according to an embodiment of the present invention.

The present invention relates to a method and apparatus for processing a protocol data unit (hereinafter referred to as "PDU") in a mobile communication system, and more particularly, to a method and apparatus for processing a PDU requiring retransmission in a mobile communication system.

In a mobile communication system providing a packet data service, a mobile terminal receiving a packet from a base station informs the base station whether the packet has been successfully received, and the base station automatically retransmits a packet not correctly received by the mobile terminal for stable packet transmission. Automatic Repeat Request (ARQ) technology is becoming common.

In a mobile communication system, a radio link control (RLC) layer for the ARQ technology is used in a transparent mode according to a processing and transmission method of a service data unit (hereinafter referred to as "SDU"). , Unacknowledged Mode, and Acknowledged Mode (hereinafter, “AM”) may be performed.

Hereinafter, assuming that AM is required in an upper layer for the ARQ technique in a mobile communication system, a processing method of a protocol data unit (hereinafter referred to as "PDU") transmitted / received through an AM of an RLC layer will be described. Shall be.

In the conventional media access control ("MAC") layer, the RLC layer requests the size and number of fixed PDUs to be transmitted in a next transmission time interval ("TTI"). The RLC layer generates PDUs by segmenting SDUs in an SDU buffer into unit sizes of fixed PDUs requested by the MAC layer. Each generated PDU may have a header of 2 bytes and a length indicator (hereinafter, referred to as “LI”) indicating the end of the SDU. The generated PDU is transferred to the MAC layer.

In the MAC layer, the ACK / NACK result of the PDU received from the upper RLC layer is received from the RLC layer of the receiving side through a status report, and at least one PDU having NACK is retransmitted. In the retransmission, the retransmission unit should retransmit by setting the same size of the previously transmitted fixed PDU, Payload and Sequence Number (hereinafter, "SN").

1 is a diagram illustrating a case of retransmission with a size of a conventional fixed PDU.

First, it is assumed that when a PDU is transmitted with a size of a conventional fixed PDU, a PDU having SN = 10 to SN = 14 is transmitted and then a status report is set to be transmitted.

In FIG. 1, the MAC layer calculates the size of a PDU to be transmitted to the first TTI and requests the PLC according to the calculated size of the PDU to the RLC layer. At this time, the size of the conventional PDU is fixed.

In the RLC layer, the SDU is divided into fixed PDU sizes in the SDU buffer to generate a PDU having SN = 10. In the first TTI, a PDU having SN = 10 is transmitted to a receiving side (Rx). After transmitting the PDU with SN = 10, the PDU transmitted to the next TTI (SN = 11 to SN = 14) is also transmitted in the same manner as the PDU is transmitted in the first TTI.

After transmitting the PDU with SN = 10 to SN = 14 according to the above assumption, if the PDU with SN = 11 is received in the status report from the receiving side, In the sixth TTI, the size, payload, and serial number of the PDU having SN = 11 are set to be the same, and then retransmitted.

However, the PDU format having a fixed size of the PUD is not suitable for a high speed packet access (HSPA) scheme supporting high speed data service. The reason for not being suitable for the HSPA method is that fading is generated due to a fixed PDU size, and one SDU may be an overhead in generating dozens of PDUs through a partitioning process.

In the High Speed Packet Access (HSDPA), up to 70 PDUs may be delivered to one PDU received from the MAC layer. Significant processing time is required to decode the headers for the delivered PDUs and process them with the results of the headers.

In addition, since the conventional ARQ unit is a PDU unit, ARQ information must be maintained and maintained by the number of PDUs, and a status report is often generated. Frequently generating the status report may affect the traffic load.

As a scheme for reducing overhead caused by the conventional fixed PDU size as described above, when a flexible size of the PDU is flexible in a mobile communication system such as HSPA, resegmentation for the retransmitted PDU may be performed. Can be. If the size of the re-partitioned PDU is different from the size of the re-partitioned PDU due to the repartitioning of the retransmitted PDU, an error on the combination may occur when the receiver processes the repartitioned PDU. .

Therefore, when repartitioning the retransmission PDU with the size of a flexible PDU in a mobile communication system requiring a high data rate such as HSPA, a method for solving a combination problem occurring at the receiving side is required.

The present invention provides a method and apparatus for processing a retransmission PDU in a mobile communication system.

The present invention also provides a method and apparatus for performing repartitioning for retransmission PDUs with the size of a flexible PDU in a mobile communication system requiring a high data rate.

According to the present invention, a method of processing a protocol data unit (PDU) requiring retransmission in a mobile communication system includes: calculating a size of a maximum transmittable PDU based on a physical element when receiving a PDU requiring retransmission; When the size of the calculated PDU is smaller than the size of the PDU for which retransmission is requested, after re-partitioning the PDU for which retransmission is requested, a subnumber is set in the repartitioned PDU to retransmit the PDU according to the set subnumber. Process.

In addition, according to the present invention, when a processing unit of a protocol data unit (PDU) requiring retransmission is received in a mobile communication system, when a PDU requiring retransmission is received through a transceiver, the processing unit calculates the size of the maximum transmittable PDU based on a physical element. If the calculated size of the PDU is smaller than the size of the PDU for which retransmission is requested, after re-segmenting the PDU for which retransmission is requested, a sub-number is set in the re-divided PDU according to the set subnumber. It includes a PDU generating unit for generating a PDU.

Hereinafter, exemplary embodiments of the present invention will be described in detail 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. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

2 is a block diagram illustrating an apparatus for processing a PDU according to an embodiment of the present invention.

In FIG. 2, the physical (PHY) layer 210 transmits data through a radio channel in a terminal and a radio access network. The physical layer 210 transmits a physical element 211 such as a signal type, a connector specification, and a allowable voltage or current to the calculation unit 231. At this time, the physical layer 210 and the upper MAC layer 230 are connected through a transport channel.

The MAC layer 230 is a layer that performs mapping between logical channels and transport channels, and includes a PDU transceiver 233 and a calculator 231. The PDU transceiver 233 selects a transport channel for transmitting the PDU generated by the PDU generator 253 and adds necessary control information to the header of the generated PDU. The calculation unit 231 calculates the maximum transmittable PDU size based on the physical warfare element 211, and then requests the PDU generation unit 253 for the PDU according to the calculated PDU size.

The RLC layer 250 is located above the MAC layer 230 to reliably transmit data, and includes an SDU buffer unit 251 and a PDU generator 253. The SDU buffer unit 251 receives the SUD 271 from the upper layer 270. The PDU generator 253 divides or concatenates the SDU 271 stored in the SDU buffer unit 251 according to the size of the PDU requested from the calculator 231 to generate a PDU. In this case, a portion of one SDU packet may be mapped to one PDU or one to one PDU may be mapped to one PDU according to the size of the PDU requested from the calculator 231. In addition, several SDUs may be generated as one PDU. As described above, one PDU generated by the PDU generator 253 is transferred to the PDU transceiver 233 and transmitted to a receiving side RLC layer (not shown).

The receiving RLC layer performs data recombination to recover SDUs from the transmitted PDUs. At this time, the RLC layer of the receiving side transmits an ACK / NACK result to the transmitting side through a status report to request retransmission for the PDU having an error among the transmitted PDUs. If there is a PDU having a NACK among the ACK / NACK results transmitted through the status report, the transmitting side should retransmit the PDU having the NACK.

Hereinafter, a method of processing a PDU requiring retransmission according to an embodiment of the present invention will be described.

The PDU transceiver 233 determines whether there is a PDU that is requested to be retransmitted by transmitting a NACK through a status report from the receiver. If there is a PDU requiring retransmission, the calculation unit 231 recalculates the maximum transmittable PDU size based on the physical element 211 of the current UE, and then PDU according to the size of the recalculated PDU. Request to the PDU generation unit 253 to retransmit.

The PDU generation unit 253 receiving the retransmission request compares the size of the recalculated PDU with the size of the PDU required for retransmission, and when the size of the recalculated PDU is greater than or equal to the size of the PDU for which retransmission is requested. In this case, the PDU is requested to be retransmitted to the PDU transceiver 233 without performing repartition.

The PDU generation unit 253 receiving the retransmission request compares the size of the recalculated PDU with the size of the PDU required to be retransmitted, and when the size of the recalculated PDU is smaller than the size of the PDU required to be retransmitted, The PDU generation unit 253 repartitions the SDU 271 according to the size of the recalculated PDU to generate PDUs. Since the PDU generation unit 253 has a plurality of re-divided PDUs, the PDU generation unit 253 sequentially sets sub numbers in order to transmit PDUs for each TTI according to the set sub number. The subnumber setting method performed by the PDU generation unit 253 will be described in detail with reference to FIGS. 6 and 7.

In addition, when the PDU generation unit 253 transmits the PDU which is the last sub number to the PDU transceiver 233, if the size of the PDU recalculated in the next TTI is larger than the size of the PDU which is the last sub number, the PDU The same operation may be performed when the size is larger than the size of the PDU required for retransmission.

Meanwhile, when the size of the recalculated PDU is larger than the size of the PDU required for retransmission, the PDU generation unit 253 may determine whether a newly transmitted SDU exists and simultaneously transmit the PDU to be retransmitted and the PDU of the newly transmitted SDU. . When the size of the recalculated PDU is larger than the size of the PDU for which retransmission is requested, the PDU generation unit 253 generates and transmits a PDU for which retransmission is required and a PDU of a newly transmitted SDU as one PDU. A method of generating the PDU requested for retransmission and the PDU of the newly transmitted SDU as one PDU will be described in detail with reference to FIGS. 8 and 9 below.

3 is a flowchart illustrating a method of processing a PDU requiring retransmission according to an embodiment of the present invention.

First, according to an embodiment of the present invention, the calculation unit 231 generates an SDU as a PDU in the RLC layer 250 according to the maximum transmittable PDU size calculated in consideration of the physical element 211 of the current UE. When the PDU transceiver 233 transmits the PDU generated by the PDU generator 253 to the receiver and receives a NACK for the PDU transmitted through the status report from the receiver, the PDU transmitting / receiving unit 253 is required to process the PDU required to be retransmitted. This will be described.

In step 301 of FIG. 3, the PDU transceiver 233 determines whether there is a PDU required for retransmission by transmitting a NACK through a status report from the receiver. In step 301, if there is a PDU requested to be retransmitted according to the determination result, the PDU transceiver 233 proceeds to step 303 to perform retransmission, and terminates if there is no PDU required to be retransmitted.

In step 303, the calculator 231 recalculates the maximum transmittable PDU size based on the physical element 211 of the current UE. In operation 305, the PDU generation unit 253 retransmits the PDU to the next TTI according to the size of the recalculated PDU.

In step 305, the PDU generation unit 253 compares the size of the recalculated PDU with the size of the PDU requiring retransmission, and when the size of the recalculated PDU is smaller than the size of the PDU requiring retransmission, It works like 4 In operation 305, when the size of the recalculated PDU is larger than the size of the PDU required for retransmission, the PDU generation unit 253 may retransmit the PDU to the next TTI and operate as shown in FIG. 5 below.

4 is a flowchart illustrating step 305 of FIG. 3 in detail according to an embodiment of the present invention.

In step 401 of FIG. 4, the PDU generator 253 recalculates the PDU according to a result of determining whether the size of the recalculated PDU is smaller than the size of the PDU for which retransmission is required in step 401. If the size of the PDU is smaller than the size of the PDU required for retransmission, the process proceeds to step 405. If the size of the recalculated PDU is greater than or equal to the size of the PDU required for retransmission, the process proceeds to step 403. In step 403, the PDU transceiver 233 retransmits the PDU requesting retransmission to the next TTI.

If the size of the recalculated PDU is smaller than the size of the PDU required to be retransmitted, in step 405, the PDU generation unit 253 repartitions the SDUs in the SDU buffer unit 251 according to the size of the recalculated PDU to divide the PDUs. Create In operation 407, the PDU generation unit 253 sets a plurality of sub-divisions of the PDUs in order, since a plurality of PDUs are repartitioned. A method of setting the sub number will be described in detail with reference to FIGS. 6 and 7 below. In step 409 of FIG. 4, the PDU transceiver 230 transmits the PDU to the next TTI according to the set subnumber.

If the size of the recalculated PDU is smaller than the size of the PDU required for retransmission, adding a subnumber by performing repartitioning does not cause a combination problem on the receiving side.

5 is a flowchart showing step 305 of FIG. 3 in detail according to an embodiment of the present invention.

First, in FIG. 5, in step 401 of FIG. 4, when the size of the recalculated PDU is not smaller than the size of the PDU for which retransmission is requested, the size of the recalculated PDU is required to be retransmitted. Is a diagram illustrating a process of determining whether the size is greater than. In addition, the process of determining whether the size of the recalculated PDU is larger than the size of the PDU required to be retransmitted may be performed even when the PDU is the last sub-number by determining whether the PDU, the last sub-number, is transmitted to the next TTI in FIG. . Accordingly, the PDU, which is the last sub-number, is a PDU generated by re-partitioning a PDU requiring retransmission, and thus will be described as being included in a PDU requiring retransmission.

In step 501 of FIG. 5, the PDU generation unit 253 determines whether the size of the recalculated PDU is larger than the size of the PDU for which retransmission is requested. In step 501, the PDU generation unit 253 proceeds to step 503 to determine whether there is a newly transmitted SDU when the size of the recalculated PDU is larger than the size of the required P retransmission. In step 501, if the size of the recalculated PDU is not greater than the size of the PDU for which retransmission is requested, the PDU generation unit 253 determines that the size of the recalculated PDU is the same as the size of the PDU for which retransmission is required. Proceed to step.

In step 503, the PDU generator 253 determines whether there is a new SDU to be transmitted, and if there is a SDU to be newly transmitted, the PDU generator 253 proceeds to step 505 to simultaneously transmit the PDU for which retransmission is requested and the PDU of the newly transmitted SDU. In step 503, if there is no new SDU to be transmitted, the PDU generation unit 253 proceeds to step 507 and retransmits the PDU required to be retransmitted to the next TTI.

In step 505 of FIG. 5, the PDU generating unit 253 generates a PDU for which retransmission is requested and a PDU of a newly transmitted SDU as one PDU. A method of generating the PDU requested for retransmission and the PDU of the newly transmitted SDU as one PDU will be described in detail with reference to FIGS. 8 and 9 below. In step 507, the PDU transceiver 233 transmits a PDU or a generated PDU requesting retransmission to the next TTI to the receiver.

Accordingly, according to the present invention, when the size of the recalculated PDU is larger than the size of the PDU required to be retransmitted, a header for the PDU of the newly transmitted SDU is generated by generating one PDU of the PDU required to be retransmitted and the SDU to be newly transmitted. Elimination can reduce overhead.

Hereinafter, a method of retransmitting a PDU requiring retransmission according to the size of the PDU recalculated in step 305 of FIG. 3 will be described with reference to FIGS. 6 to 9.

First, it is assumed in FIG. 6 and FIG. 9 that after the PDU with SN = 10 to SN = 14 is transmitted, it is set to receive a status report.

In FIG. 6 and FIG. 9, the calculator 231 calculates the maximum PDU size that can be transmitted to the first TTI based on the physical element 211 of the current UE, and generates a PDU according to the calculated PDU size. 253). At this time, the size of the PDU according to the embodiment of the present invention is flexible.

The PDU generator 253 divides the SDU into the SUD buffer 251 according to the calculated size of the PDU to generate a PDU having SN = 10. The first TTI transmits a PDU with SN = 10. After transmitting the PDU having SN = 10, the PDU transmitted to the next TTI (SN = 11 to SN = 14) is also transmitted in the same manner as transmitting the PDU in the first TTI.

After transmitting the PDUs with SN = 10 to SN = 14 according to the above assumption, if the PDU having SN = 11 is NACK in the status report from the receiver, the maximum PDU size that can be transmitted to the next TTI is recalculated. Therefore, the PDU with SN = 11 shall be retransmitted according to the calculation result.

When the PDU with SN = 11 is received as NACK, when the size of the maximum PDU that can be transmitted to the next TTI is recalculated, the size of the recalculated PDU is smaller than the size of the PDU required for retransmission. FIGS. 4 and 5. If the PDU retransmission is required in the same manner as the above, and the size of the recalculated PDU is larger than the size of the PDU required to be retransmitted, and there is a new SDU to be transmitted, the retransmission is performed in the same manner as in FIGS. 6 and 7. This requested PDU may be retransmitted.

6 is a flowchart illustrating a retransmission scheme of a PDU requiring retransmission when the size of the recalculated PDU is smaller than the size of the PDU requiring retransmission according to an embodiment of the present invention.

In FIG. 6, when the size of the recalculated PDU to be transmitted to the next TTI is smaller than the size of the PDU required to be retransmitted for the PDU having SN = 11 requiring retransmission, the PDU generation unit 253 may be configured to the size of the recalculated PDU. Accordingly, PDUs are generated by repartitioning PDUs to be retransmitted. That is, after completing the transmission by repartitioning the PDU having SN = 11 according to the size of the PDU to be transmitted to the next TTI, the remaining PDUs should be transmitted as the PDU having SN = 12. However, since PDUs having SN = 12 transmitted to the next TTI have the same SN value as PDUs having previously transmitted SN = 12, a problem of SDU combination occurs at the receiving side.

Therefore, according to an embodiment of the present invention, the PDUs re-divided by the PDU generation unit 253 are sequentially inserted by inserting a separate SS field in which the same SN value and a sub sequence (hereinafter, “SS”) are defined. A PDU having a new data format of a PDU numbering must be transmitted to the receiver.

A method of transmitting a PDU having a new data format to a receiver will be described with reference to FIG. 6.

First, in the sixth TTI, the PDU generation unit 253 re-partitions a PDU having SN = 11 required for retransmission and generates two PDUs, in which the SN field corresponds to a SN field of 11 and an SS field according to the data format of the PDU. SS = 2 is set at to generate a PDU with SN = 11-1. The PDU transceiver 233 transmits the generated PDU having SN = 11-1 to the receiver.

After the transmission of the PDU having SN = 11-1 is completed, the PDU generation unit 253 sets SN = 11 in the header field and SS = 2 in the SS field for the remaining SN = 11 in the 7th TTI. Create a PDU. The PDU transceiver 233 transmits the generated PDU having SN = 11-2 to the receiver.

Therefore, in the present invention, when the size of the recalculated PDU is smaller than the size of the PDU required for retransmission, even if the repartition is performed, the problem of combination does not occur at the receiving side.

FIG. 7 is a diagram illustrating a data format of a PDU for which retransmission is required when the size of the recalculated PDU is smaller than the size of the PDU for which retransmission is requested according to an embodiment of the present invention.

In FIG. 7, the header field 701 includes an RLC basic header of Rel'99. The header field 701 includes information indicating whether the SS field 703 is present.

The SS field 703 is further included after the header field 701 when a particular PDU is retransmitted and when the PDU is repartitioned. And the upper 4 bits of the SS field 703 indicate the SS value of a specific SN. For example, if the retransmission PDU is generated with three repartitioned PDUs, the SS values of the three repartitioned PDUs are 0001,0010,0011, respectively. If the lower 4 bits of the SS field 703 are 0000, it means that there is a next PDU to be transmitted (Still Remainning PDU), if it is 0001, it means that there is another SS field, and if it is 0010, it is the last. An SDU (Exactly end SDU), which means 0011 means a length indicator (Length Indicator) for distinguishing the next SDU, and 0100 to 1111 means an SS value (Reserved). The payload 705 includes the actual PDU.

8 is a flowchart illustrating a retransmission method of a PDU requiring retransmission when a size of a recalculated PDU is larger than the size of the PDU requiring retransmission and a new SDU to be transmitted exists.

First, in the sixth TTI, the PDU generation unit 253 re-partitions a PDU having SN = 11 required for retransmission and generates two PDUs, in which the SN field corresponds to a SN field of 11 and an SS field according to the data format of the PDU. SS = 2 is set at to generate a PDU with SN = 11-1. The PDU transceiver 233 transmits the generated PDU having SN = 11-1 to the receiver.

After the transmission of the PDU having SN = 11-1 is completed, in the seventh TTI, the PDU generation unit 253 may determine that the size of the recalculated PDU is larger than the size of the PDU required for retransmission, and the SDU buffer unit 251. If there is a SDU to be newly transmitted, a PDU (PDU having SN = 11-2) requested to be retransmitted and a PDU (SN = 15 PDU having a new SDU) to be newly transmitted are generated as one PDU. At this time, the PDU transceiver 233 transmits the generated one PDU, and must simultaneously receive the ACK or NACK results for the PDU with SN = 11-2 and SN = 15 through the status report from the receiving side.

Meanwhile, in FIG. 8, if two or more PDUs are not generated in one PDU data format, and the PDUs are transmitted to the PDU transceiver 233, an additional MAC header field for distinguishing the PDUs for each PDU is provided. Exists and overhead may occur.

Hereinafter, in order to reduce the overhead, the PDU generator 253 uses the first PDU 910 for the PDU requested to be retransmitted and the second PDU 930 for the PDU of the SDU to be newly transmitted. ), It has the data format of a PDU as shown in FIG. 9 below.

FIG. 9 is a diagram illustrating a data format of a PDU for which retransmission is requested when a PDU for which retransmission is requested and a PDU for a newly transmitted SDU are generated as one PDU according to an embodiment of the present invention.

First, the PDU generation unit 253 sets SN = 11 in the header field 911 of the first PDU 910, and sets it to 00100011 to indicate that SS = 2 and LI values exist in the SS field 913. Setting (see setting values of the upper 4 bits and the lower 4 bits described above with reference to FIG. 5). The LI field 915 sets a length indicator for identifying the SDU, and the payload field 917 sets actual data of the first PDU.

In addition, the PDU generation unit 253 sets SN = 15 in the header field 931 of the second PDU 930, sets a length indicator for distinguishing SDUs in the LI field 733, and payload field 935. ) Sets the actual data of the second PDU.

The PDU generation unit 253 sets the first PDU and the second PDU in the data format of the PDU as described above, generates one PDU 900, and delivers the PDU 900 to the PDU transceiver 233. The PDU transceiver 233 transmits the generated PDU 900 to the receiver. If the payload remains even after decoding the header field 911 of the first PDU and separating the SN and the payload, the receiver may know that the second PDU field 930 having a new SN exists.

Accordingly, according to the present invention, when the size of the recalculated PDU is larger than the size of the PDU required to be retransmitted and there is a PDU of the newly transmitted SDU, the present invention transmits the PDU requested to be retransmitted and the PDU of the newly transmitted SDU to one PDU 900. By generating, the overhead that may occur in the PDU transceiver 233 may be reduced.

As described above, the present invention can reduce the overhead for fading and partitioning by dynamically dividing the size of the PDU for a high data rate.

In addition, according to the present invention, since the size of the PDU is flexible, when the size of the PDU is smaller than the size required for retransmission when the PDU is retransmitted, an SS field may be added to prevent a combination problem from occurring at the receiving side.

In addition, the present invention can reduce the overhead by generating a PDU generated with a re-partitioned PDU and a new SN as a single PDU.

Claims (8)

In the method of processing a protocol data unit (PDU) is required for retransmission in a mobile communication system, Calculating a size of a maximum transmittable PDU based on a physical element when receiving a PDU requiring retransmission; And When the size of the calculated PDU is smaller than the size of the PDU required for retransmission, after re-segmenting the PDU for which retransmission is requested, a sub-number is set in the re-divided PDU to retransmit the PDU according to the set sub-number. A method of processing a retransmission protocol data unit comprising a process. The method of claim 1, The physical element is A method of processing a retransmission protocol data unit including a signal format of a current terminal and allowances of voltage and current. The method of claim 1, If the size of the calculated PDU is larger than the size of the PDU for which retransmission is requested, if there is a service data unit (SDU) to be newly transmitted, the PDU for which the retransmission is requested and the PDU of the newly transmitted SDU are generated as one PDU. The retransmission protocol data unit processing method further comprising the step of retransmission. The method of claim 3, wherein The size of the PDU required for retransmission is And a retransmission protocol data unit having a size of a PDU which is the last sub number among the set sub numbers. A processing apparatus of a protocol data unit (PDU) for which retransmission is requested in a mobile communication system, A calculation unit calculating a size of a maximum transmittable PDU based on a physical element when receiving a PDU requiring retransmission through a transceiver; And When the size of the calculated PDU is smaller than the size of the PDU requested to be retransmitted, after re-partitioning the PDU requested to be retransmitted, a subnumber is set in the repartitioned PDU to generate a PDU according to the set subnumber. An apparatus for processing a retransmission protocol data unit including a PDU generation unit. The method of claim 5, wherein And a SDU buffer unit for storing a service data unit (SDU) received from an upper layer. The method of claim 5, wherein The PDU generation unit When the size of the calculated PDU is larger than the size of the PDU required for retransmission, if there is a service data unit (SDU) to be newly transmitted, the PDU for which retransmission is requested and the PDU of the newly transmitted SDU are generated as one PDU. Apparatus for processing a retransmission protocol data unit further comprising. The method of claim 7, wherein The size of the PDU required for retransmission is And a processing unit of a retransmission protocol data unit including a size of a PDU which is a last sub number among the set sub numbers.

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