KR20150105171A - Method and apparatus for supporting large service data unit in mobile communication system - Google Patents

Abstract

A method and apparatus are provided for supporting a large Service Data Unit (SDU) in a receiver of a mobile communication system. The method includes receiving a Radio Link Control (RLC) Protocol Data Unit (PDU) from an upper layer; checking a Length Indicator (LI) included in an RLC header of the RLC PDU; if the LI is configured as ″0″, determining that the received RLC PDU includes an RLC SDU of 2047 bytes, and if the LI is configured as a value other than ″0″, determining that the received RLC PDU includes an RLC SDU of a size corresponding to the value of the LI; and reforming the RLC SDU, based on the LI.

Description

Technical Field [0001] The present invention relates to a method and apparatus for supporting a large capacity service data unit in a mobile communication system,

The present invention relates to a method and apparatus for supporting large capacity service data units (SDUs) in a mobile communication system.

BACKGROUND OF THE INVENTION Mobile communication systems are widely used to provide various types of communication. For example, voice and / or data may be provided through these mobile communication systems. A typical wireless communication system, or network, may provide multiple users access to one or more shared resources (e.g., bandwidth, transmit power, etc.). For example, the system may support various multiple access techniques such as frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM), orthogonal frequency division multiplexing (OFDM), 3GPP Long Term Evolution Can be used.

The protocol stack of a long term evolution (LTE) system using the OFDM multiple access scheme includes a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence data convergence protocol (PDCP).

Currently, most computer systems are based on a maximum transfer unit (MTU) of 1500 bytes. Accordingly, in the LTE system, the maximum length of one radio link control (RLC) service data unit (SDU) is set to 11 bits, that is, 2047 bytes. Therefore, in order to transmit a large amount of data larger than 2047 bytes, a fragment is required in the upper part of the LTE system (that is, the internet protocol (IP) layer).

Currently, there is no big problem because the MTU of most LTE upper systems is set to 1500 bytes. However, LTE protocol stack needs to be considered in order to support higher-order systems with an MTU exceeding 1500 bytes, precisely 2047 bytes.

The present invention provides a method and apparatus for supporting a large capacity service data unit (SDU) in a mobile communication system.

The present invention provides a method and apparatus for scheduling and implementing an RLC PDU.

A receiving method according to an embodiment of the present invention is a method for supporting a large capacity service data unit (SDU) in a receiver of a mobile communication system, the method comprising: receiving a radio link control (PDU) process; Checking a length indicator (LI) of the RLC header of the RLC PDU; If the LI is set to 0, the received RLC PDU is determined to be an RLC SDU of 2047 bytes. If the LI is set to a non-zero value, it is determined that the received RLC PDU is a value corresponding to the size of the RLC SDU Process; And reconstructing the RLC SDU based on the LI.

A transmission method according to an embodiment of the present invention is a method for supporting a large capacity service data unit (SDU) in a transmitter of a mobile communication system, the method comprising: checking a size of an RLC SDU to be transmitted; Checking whether the number of bytes exceeds 2047 bytes; A step of segmenting the RLC SDU in units of 2047 bytes; Setting a length identifier (LI) to 0 for an RLC SDU of 2047 bytes and setting an LI corresponding to the size of the remaining RLC SDUs in remaining RLC SDUs; And transmitting a radio link control (PDU) protocol data unit (PDU) based on the set LI.

An apparatus for supporting a large capacity SDU in a receiver of a mobile communication system according to an exemplary embodiment of the present invention includes an apparatus for receiving a radio link control (PDU) protocol data unit (PDU) A receiving unit; And a length identifier (LI) of the RLC header of the RLC PDU. If the LI is set to 0, the RLC PDU is determined to be an RLC SDU of 2047 bytes. If the LI is set to a non-zero value Determining that the received RLC PDU is a value corresponding to the size of the RLC SDU, and reconfiguring the RLC SDU based on the LI.

A transmitting apparatus according to an embodiment of the present invention is a device for supporting a large capacity service data unit (SDU) in a transmitter of a mobile communication system. The transmitting apparatus checks the size of an RLC SDU to be transmitted, verifies whether it exceeds 2047 bytes, The RLC SDU is segmented in units of 2047 bytes, the identifier (LI) is set to 0 for the length in the RLC SDU of 2047 bytes, and the LI corresponding to the size of the remaining RLC SDU is set in the remaining RLC SDUs A control unit; And a transmitter for transmitting a radio link control (PDU) protocol data unit (PDU) based on the set LI.

The present invention can support a large capacity service data unit (SDU) in a mobile communication system.

The present invention increases the header length by N x 12 bits as the number of large RLC SDUs increases, but requires no additional signaling in the upper layer for compatibility with the existing LTE protocol stack, PDUs, which are easy to schedule and implement.

1 is a diagram showing a protocol stack structure of an LTE system;
2 is a diagram showing an example of a packet structure in an LTE system;
3 is a diagram showing another example of a packet structure in an LTE system;
4 is a diagram illustrating a configuration of a MAC PDU according to an embodiment of the present invention;
5 is a packet structure diagram in an LTE system for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention;
6 is a packet structure diagram in an LTE system for supporting a large capacity service data unit (SDU) in a mobile communication system according to another embodiment of the present invention;
7 is a packet structure diagram in an LTE system for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention;
8 is a flowchart illustrating a base station operation for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention;
9 is a flowchart illustrating a terminal operation for supporting a large capacity service data unit (SDU) in a mobile communication system according to another embodiment of the present invention;
10 is a block diagram of a terminal block for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention; And
11 is a block diagram of a base station block for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same components are denoted by the same reference numerals as possible in the accompanying drawings. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

Also, the terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor is not limited to the concept of terms in order to describe his invention in the best way. It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined.

A base station to be described below can be simplified to a two-node structure of an evolved Node B (hereinafter referred to as 'ENB' or 'Node B') and an anchor node. A UE to be described below refers to a user equipment (UE) 101.

1 shows a protocol stack structure of an LTE system.

The protocol stack of the LTE system of FIG. 1 comprises three parts: a PHY (not shown), a MAC layer 100, an RLC layer 110, and a PDCP layer 120.

1 shows a process in which an IP packet is transmitted through the PDCP layer 120, the RLC layer 110, and the MAC layer 100 of the LTE protocol stack.

The PDCP layer 120 compresses the IP packet transmitted from the IP layer 130 using a TCP / UDP / IP / RTP (RTP) header, a Robust Header (PDCP) PDU (Protocol Data Unit) through processing such as compression, addition, compression, addition of PDCP header, and ciphering. In other words, when the size of the RLC PDU to be transmitted is determined, the upper layer data is segmented or concatenated accordingly, and an RLC PDU is generated by inserting an RLC PDU header.

The RLC layer 110 concatenates several PDCP PDUs according to resources allocated from the MAC layer 100 or segments one PDCP PDU to generate an RLC PDU. The RLC layer 110 may also perform retransmission to recover packet losses.

The MAC layer 100 allocates radio resources, allocates RLC PDU sizes for each logical channel, and generates MAC PDUs.

Since the MTU size of most systems is set to 1500 bytes, the size of the IP packet does not exceed 1500 bytes. The fact that the size of the IP packet does not exceed 1500 bytes means that the size of one PDCP PDU does not exceed about 1500 bytes. As can be seen from the RLC acknowledged mode data (PDU) PDU format, since the length of the RLC SDU (i.e., the length indicator (LI) field) is 11 bits in the current LTE RLC specification, up to 2047 bytes of PDCP PDU Therefore, there is no problem in a system having an MTU of 1500 bytes.

However, assuming that the MTU size is 1500 bytes or more, that is, the system is changed to 2047 bytes or more, the size of the PDCP PDU will also become larger than 2047 bytes. This means that the size of the RLC SDU is increased to 2047 bytes or more, so that it is impossible to express the case where the size of the RLC SDU is 2047 bytes or more in the current 11-bit LI field.

2 shows an example of the packet structure in the LTE system.

Referring to FIG. 2, the packet includes a header field 230 and a data field 240.

The header field 230 includes a D / C field 201, a Re-segmentation Flag field 203, a Polling bit field 205, a FI (Framing Info) field 207, An Extension bit (E) field 209, a Sequence Number (SN) field 211, an LI (Length Indicator) field, and the like.

The D / C field 201 indicates whether the RLC PDU is an RLC data PDU or an RLC control PDU.

The RF field 203 indicates whether the RLC PDU is an AMD PDU or an AMD PDU segment.

P field 205 indicates whether the transmitting side of the AM RLC entity requests status reporting to the peer AM RLC entity.

FI field 207 indicates whether the beginning of the RLC SDU corresponds to the beginning of the data field and whether the end of the RLC SDU corresponds to the end of the data field.

The E field 209 is a 1-bit field. The E field 209 indicates whether the data field is followed or whether the set of the E field and the LI field is consecutive.

The SN field 211 indicates the sequence number of the RLC data PDU.

Padding refers to specific bits (usually '0') that are filled in the remaining portion of the packet so that when the packet is generated with data, the size of the packet is byte-aligned, and the padding field 213 of FIG. 2 is padded .

Data field 240 of FIG. 2 includes at least one data field element. The data field element includes one or more RLC SDU segments and / or one or more RLC SDUs.

The LI field indicates the byte length of the corresponding data field element present in the received or received RLC data PDU by the RLC layer. In the embodiment of the present invention, the RLC layer increases the bits of the LI field to process PDCP PDUs (i.e., RLC SDUs) larger than 2047 bytes. The 11-bit LI field is increased to 13 bits or larger considering a later extension. This is the easiest method, but there is a burden to change the specification, and even if it is changed, backward compatibility with the existing protocol LTE protocol stack must be considered, which can put a heavy burden on the scheduling of the LTE system.

3 shows another example of the packet structure in the LTE system.

3 shows an example in which the data field 300 is applied without using the LI field. That is, RLC SDUs larger than 2047 bytes are placed at the end of the RLC SDUs without using the LI field. If the LI field is not used, it can be used when one RLC SDU is included in the RLC PDU. If the LI field is not used, there is an advantage that the size of the RLC SDU is relatively free since there is no LI field.

4 shows a configuration of a MAC PDU according to an embodiment of the present invention.

When several RLC SDUs are concatenated, an RLC PDU can be configured by placing an RLC SDU larger than 2047 bytes at the end of the SDUs.

In this method, even if the LI field indicating the final size is not used, the length can be indirectly derived by using the length of the MAC PDU. However, the method of not using the LI field increases the overhead of the MAC PDU by adding MAC sub-headers 401 and 402 to the MAC header.

One MAC SDU (i.e., RLC PDU) is mapped to one MAC sub-header as shown in FIG. Therefore, if one RLC PDU is generated for each RLC SDU using a method that does not use the LI field, one MAC sub-header must be configured for each RLC PDU, which leads to an increase in unnecessary MAC sub-headers.

Placing RLC SDUs larger than 2047 bytes at the end of SDUs is also likely to cause in-order delivery problems and is limited due to scheduling difficulties.

5 illustrates a packet structure diagram in an LTE system for supporting a large capacity SDU in a mobile communication system according to an embodiment of the present invention.

The LI field of the RLC PDU may be omitted if the RLC SDU is the last RLC SDU among the plurality of RLC SDUs or is the only RLC SDU that can be transmitted.

The RLC SDU length can be extended by redefining the value 0 of the LI field in order to support the SDU in the mobile communication system according to the embodiment of the present invention. That is, although 0 in the LI field of the current RLC PDU is defined as "reserved ", in the embodiment of the present invention, 0 is defined as" 2047 bytes + alpha & have. The LI field value 2047 simply indicates the PDCP PDU 2047 bytes.

In FIG. 5, there are three RLC SDUs, and the sum of the two RLC SDUs is 2347 bytes, which is larger than 2047 bytes. Assuming that the wireless allocation is enough to send three SDUs, the LI value of the RLC header can be expressed as shown in FIG.

In order to transmit the RLC SDU of 1000 bytes, the LI ₁ of the RLC header is indicated by 1000 (indicated by "LI _{1 =} 1000") (500).

LI ₂ and LI ₃ of the RLC header are expressed as 0 and 300, respectively, in order to transmit a PDCP PDU of 2347 bytes larger than 2047 bytes. An RLC SDU of 2347 bytes consists of a 2047-byte RLC SDU and a 300-byte RLC SDU. 2047 RLC SDU of the byte denotes the LI for example to _{"0" ( "LI 2 =} 0" represented by 510), the RLC SDU of 300 bytes indicates the LI for example a _{"300" ( "LI 3 =} 300 Quot;) (520).

That is, when the LI value of the RLC header is indicated as "0 ", the RLC SDU indicates 2047 bytes. When the LI value of the RLC header is indicated as" 300 ", for example, Lt; / RTI >

As described above, according to the present invention, the length of the RLC header is increased by N x 12 bits as the number of large RLC SDUs (N) increases, but separate signaling in the upper layer is required for compatibility with existing specifications RLC PDUs are configured, and scheduling and implementation are easy.

6 illustrates a packet structure diagram in an LTE system for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention.

The size of the RLC SDU has a variable size depending on a channel condition, an allocated resource condition, and the like. FIG. 6 shows an example of a case where a radio resource allocation is not enough and fragmented. Reference numeral 640 denotes a PDCP PDU to be transmitted in the next TTI because 668 bytes (5300 bytes - 4632 bytes) is not enough for radio resource allocation.

On the other hand, in order to transmit the RLC SDU of 1000 bytes, the LI ₁ of the RLC header is indicated by 1000 (indicated by "LI _{1 =} 1000") (600).

1000 bytes and 5300 bytes of PDCP PDUs are in the queue but the radio resource allocation is not sufficient and only 1000 bytes of RLC SDU and 4632 bytes of RLC SDU are transmitted. At this time, since the fragmented RLC SDU 630 of 4632 bytes is the last SDU of the RLC PDU, an LI field is not required separately as shown in FIG. However, in order to indicate that the RLC SDU has been fragmented, the FI field of the RLC header is set to "0b01 ".

7 shows a packet structure diagram in an LTE system for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention.

Reference numeral 740 shows a case where the leading part of the RLC SDU larger than 2047 bytes is fragmented and transmitted in the previous TTI. It is assumed that 500 bytes have already been transmitted in the previous TTI. In this case, LI _{1 =} 0 (710), LI _{2 =} 0 (720), and LI _{3 =} 506 (730) are set in the LI fields of the RLC header to represent the remaining RLC SDUs of 4600 bytes (i.e., 5100 bytes to 500 bytes) Respectively. That is, in case of an RLC SDU of 2047 bytes, the LI field of the RLC header is set to LI _{1 =} 0 (710), and in case of the RLC SDU of 506 bytes, the LI field of the RLC header is set to LI _{3 =} 0 (730).

In addition to setting the LI, the FI field of the RLC header is set to "0b01" to indicate that the RLC SDU has been fragmented.

In the second and third embodiments of the present invention, even when the maximum allowable length of the PDCP PDU continuously increases as compared with the first embodiment, it is possible to support the PDCP PDU without continuously changing the bit number of the specification.

8 is a flowchart of a base station operation for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention.

Referring to FIG. 8, in step 801, the BS determines the size of an RLC SDU to be transmitted.

In step 803, the base station determines whether the size of the RLC SDU to be transmitted exceeds 2047 bytes. If the size of the RLC SDU to be transmitted does not exceed 2047 bytes, the base station transmits the RLC PDU in the conventional manner in step 813. However, if the size of the RLC SDU to be transmitted exceeds 2047 bytes, the base station segments all the RLC SDUs in units of 2047 bytes in step 805. That is, the remaining RLC SDUs except the 2047-byte RLC SDU and the 2047-byte RLC SDU are segmented. In step 807, the base station sets "0" in the LI field of the RLC header for the RLC SDU of 2047 bytes and sets the LI field of the RLC header for the remaining RLC SDUs except for the RLC SDU of 2047 bytes in step 809, As shown in FIG. That is, as shown in FIG. 5, "LI _{2 =} 0" is indicated for the RLC SDU of 2047 bytes and "LI _{3 =} 300" is displayed for the remaining RLC SDUs excluding the RLC SDU of 2047 bytes.

In the case of FIG. 6, LI _{1 =} 1000 is indicated for the RLC SDU of 1000 bytes, and LI field is not required for the RLC SDU of 4632 bytes because it is the last SDU of the RLC PDU.

In the case of FIG. 7, LI _{1 =} 0 (710) and LI _{2 =} 0 (720) can be set for 2047-byte RLC SDUs and LI _{3 =} 506 (730) for 506-byte RLC SDUs .

In step 811, the BS transmits an RLC PDU based on the set LI field.

9 is a flowchart of a terminal operation for supporting a large capacity SDU in a mobile communication system according to another embodiment of the present invention.

Referring to FIG. 9, in step 901, the UE receives an RLC PDU. The UE confirms the LI of the RLC header received in step 903. The UE determines in step 905 whether the LI of the RLC header is 0 or not. If the LI is not 0, the UE reconfigures the RLC SDU in step 913 in a conventional manner. However, if the LI is 0, the UE determines in step 907 that it is an SDU exceeding 2047 bytes.

The UE reconstructs the RLC SDU based on the LI determined in step 909, and transmits the RLC SDU to the upper layer in step 911.

10 is a block diagram of a terminal for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention.

10, the terminal includes a transmission / reception unit 1030, a reception unit 1010, a control unit 1010, a memory unit 1040, and a user interface unit 1020.

The transmitter / receiver 1030 includes a transmitter module and a receiver module for transmitting / receiving data to / from a base station according to an embodiment of the present invention in a mobile communication system. Also, the transmitter / receiver 1030 receives an RLC PDU from a base station.

The controller 1010 checks the LI of the RLC header for the RLC PDU and determines whether the LI of the RLC header is 0. If the LI is 0, the controller 1010 determines that the SDU is more than 2047 bytes, and reconstructs the RLC SDU based on the confirmed LI.

The user interface unit 1020 transmits information input by a user's operation to the control unit 1010 or provides information necessary for a user under the control of the control unit 1010. [

11 is a block diagram of a base station for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention.

11, the base station includes a transmission / reception unit 1120, a memory unit 1130, and a control unit 1110.

The transmitter / receiver 1120 transmits / receives data to / from a terminal according to an embodiment of the present invention in a mobile communication system. That is, the transmitter / receiver 1120 transmits the RLC PDU to the UE based on the LI.

The memory unit 1130 stores or extracts various data necessary for supporting a large capacity service data unit (SDU) in a mobile communication system according to an embodiment of the present invention in a mobile communication system.

The controller 1110 determines whether the size of the RLC SDU to be transmitted exceeds 2047 bytes in the mobile communication system. If the size of the RLC SDU exceeds 2047 bytes, the controller 1110 segments the RLC SDU in units of 2047 bytes, LI = 0 is set, and an LI corresponding to the size of the remaining SDU is set in the remaining SDUs.

It will also be appreciated that a method and apparatus for supporting a large capacity SDU in a mobile communication system according to an embodiment of the present invention can be implemented in hardware, software, or a combination of hardware and software. Such arbitrary software may be stored in a memory such as, for example, a volatile or non-volatile storage device such as a storage device such as ROM or the like, or a memory such as a RAM, a memory chip, a device or an integrated circuit, , Or a storage medium readable by a machine (e.g., a computer), such as a CD, a DVD, a magnetic disk, or a magnetic tape, as well as being optically or magnetically recordable. In a mobile communication system according to an embodiment of the present invention, a method for supporting a large capacity service data unit (SDU) may be implemented by a computer or a mobile terminal including a controller and a memory, Readable storage medium suitable for storing a program or programs containing instructions for implementing the method of the present invention.

Accordingly, the invention includes a program comprising code for implementing the apparatus or method as claimed in any of the claims herein, and a storage medium readable by a machine (such as a computer) for storing such a program. In addition, such a program may be electronically transported through any medium such as a communication signal transmitted via a wired or wireless connection, and the present invention appropriately includes the same.

The apparatus for supporting the SDU in the mobile communication system according to the embodiment of the present invention may receive and store the program from a program providing apparatus connected by wire or wireless. The program providing apparatus includes a program including instructions for causing the program processing apparatus to perform a method for supporting a large capacity service data unit (SDU) in a predetermined mobile communication system, a program for causing a large capacity service data unit (SDU) A communication unit for performing wired or wireless communication with the graphic processing apparatus, and a transmission unit for transmitting the program to the transmission / reception apparatus at the request of the graphic processing apparatus or automatically And a control unit.

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, but is capable of various modifications within the scope of the invention. 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.

Claims (20)

A method for supporting a high capacity service data unit (SDU) in a receiver of a mobile communication system,
Receiving a radio link control (PDU) protocol data unit (PDU) from an upper layer;
Checking a length indicator (LI) of the RLC header of the RLC PDU;
When the LI is set to 0, it is determined that the received RLC PDU is a 2047-byte RLC SDU. If the LI is set to a non-zero value, the received RLC PDU is a value corresponding to the size of the RLC SDU A process of determining; And
And reconfiguring the RLC SDU based on the LI. The method as claimed in claim 1, The method according to claim 1,
Wherein the LI is a field set in an RLC header. The method of claim 1, wherein the LI is a field set in an RLC header. The method according to claim 1,
Wherein the LI is omitted if the RLC SDU is the last RLC SDU among the plurality of RLC SDUs. The method according to claim 1,
Wherein the LI is omitted if the RLC SDU is the only RLC SDU that can be transmitted. ≪ RTI ID = 0.0 > [10] < / RTI > The method according to claim 1,
Wherein the FI field of the RLC header indicates that a plurality of RLC SDUs are fragmented. ≪ RTI ID = 0.0 > [10] < / RTI > A method for supporting a high capacity service data unit (SDU) in a transmitter of a mobile communication system,
Determining a size of an RLC SDU to be transmitted;
Checking whether the number of bytes exceeds 2047 bytes;
A step of segmenting the RLC SDU in units of 2047 bytes;
Setting a length identifier (LI) to 0 for an RLC SDU of 2047 bytes and setting an LI to a value corresponding to the size of the remaining RLC SDUs for the remaining RLC SDUs; And
And transmitting a radio link control (PDU) protocol data unit (PDU) based on the set LI. The method of claim 1, The method according to claim 6,
Wherein the LI is a field set in an RLC header. The method of claim 1, wherein the LI is a field set in an RLC header. The method according to claim 6,
Wherein the LI is omitted when the RLC SDU is the last RLC SDU among the plurality of RLC SDUs. The method according to claim 6,
Wherein if the RLC SDU is the only RLC SDU that can be transmitted, the LI is omitted. The method according to claim 6,
Wherein the FI field of the RLC header indicates that a plurality of RLC SDUs are fragmented. An apparatus for supporting a large capacity service data unit (SDU) in a receiver of a mobile communication system,
A receiving unit for receiving a radio link control (PDU) protocol data unit (PDU) from an upper layer; And
Determines a length identifier (LI) of the RLC header of the RLC PDU and, if the LI is set to 0, determines that the received RLC PDU is an RLC SDU of 2047 bytes, and if the LI is set to a non- , Determining that the received RLC PDU is a value corresponding to the size of the RLC SDU, and reconfiguring the RLC SDU based on the LI. SDU). 12. The method of claim 11,
Wherein the LI is a field set in an RLC header. The apparatus of claim 1, wherein the LI is a field set in an RLC header. 12. The method of claim 11,
Wherein the LI is omitted when the RLC SDU is the last RLC SDU among the plurality of RLC SDUs. 12. The method of claim 11,
Wherein the LI is omitted when the RLC SDU is the only RLC SDU that can be transmitted. 12. The method of claim 11,
Wherein the FI field of the RLC header indicates that a plurality of RLC SDUs are fragmented. An apparatus for supporting a large capacity service data unit (SDU) in a transmitter of a mobile communication system,
The size of the RLC SDU to be transmitted is checked and it is confirmed whether it exceeds 2047 bytes. If exceeding, the RLC SDU is segmented by 2047 bytes, the length identifier (LI) is set to 0 for the RLC SDU of 2047 bytes, And setting LI to a value corresponding to the size of the remaining RLC SDUs for the remaining RLC SDUs; And
And a transmitter for transmitting a radio link control (PDU) protocol data unit (PDU) based on the set LI. 17. The method of claim 16,
Wherein the LI is a field set in an RLC header. The apparatus of claim 1, wherein the LI is a field set in an RLC header. 17. The method of claim 16,
Wherein the LI is omitted when the RLC SDU is the last RLC SDU among the plurality of RLC SDUs. 17. The method of claim 16,
Wherein the LI is omitted if the RLC SDU is the only RLC SDU that can be transmitted. 17. The method of claim 16,
Wherein the FI field of the RLC header indicates that a plurality of RLC SDUs are fragmented. ≪ RTI ID = 0.0 > 8. < / RTI >

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