KR101276024B1 - Apparatus and Method for Transmitting of Protocol Data in HSDPA system - Google Patents

Abstract

The present invention provides a packet data transmission method through a high-speed forward packet access in a wideband code division multiple access system, comprising: a base station checking a radio resource situation or a hardware resource situation associated with a terminal; Setting a maximum size of a radio link control packet data unit (RLC PDU) that the base station can transmit without splitting, and transmitting maximum size information indicating the maximum size of the set RLC PDU to the base station controller The process of doing so; The maximum size information is used to determine the size of at least one RLC PDU generated according to whether the RLC Service Data Unit (SDU) is divided.

WCDMA, HSDPA, RLC, MAC, PDU

Description

Apparatus and Method for Transmitting of Protocol Data in HSDPA system

1 is a diagram schematically illustrating a structure of a general W-CDMA communication system.

2 is a diagram illustrating a protocol hierarchy of a communication system using a high speed forward packet access scheme to which the present invention is applied.

3 illustrates an RLC-AM (acknowledged mode) format, which is one of the RLC PDU formats currently used in RLC.

4 is a signaling flowchart according to an embodiment of the present invention.

5 is a diagram illustrating a configuration of a Node-B according to an embodiment of the present invention.

6 is a flowchart illustrating the operation of a Node-B according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of an SRNC according to an embodiment of the present invention.

8 is a flowchart illustrating the operation of an SRNC according to an embodiment of the present invention.

9 is a flowchart illustrating a process of setting a size of a maximum RLC PDU in Node-B according to an embodiment of the present invention.

10 is a flowchart illustrating a process of setting a maximum RLC PDU size in a Node-B according to another embodiment of the present invention.

The present invention relates to a wideband code division multiple access (WCDMA) system, in particular a high speed downlink packet access (HSDPA) system to be used. A method for preventing overhead in a radio link control (hereinafter referred to as "RLC") layer and a media access control (hereinafter referred to as "MAC") layer.

Today, mobile communication systems are evolving from high-speed, high-quality wireless data packet communications systems for providing data services and multimedia services away from providing initial voice-oriented services. In addition, the third generation mobile communication system which is currently divided into asynchronous (3GPP) and synchronous (3GPP2) has been standardized for high-speed, high-quality wireless data packet services. For example, in 3GPP, standardization of High Speed Downlink Packet Access (hereinafter referred to as "HSDPA") is in progress, and in 3GPP2, standardization of 1xEV-DV (Evolution Data and Voice) is in progress. have. This standardization work is a representative proof of the effort to find a solution for the high speed, high quality wireless data packet transmission service of 2Mbps or higher in the third generation mobile communication system, and the fourth generation mobile communication system is the higher speed, high quality multimedia. It is based on service provision.

In general, HSDPA is a control channel associated with a high speed-downlink shared channel (hereinafter referred to as "HS-DSCH") for supporting forward high-speed packet transmission in a W-CDMA communication system, and apparatus and system therefor. The methods are generic. In order to support the HSDPA, a Hybrid Automatic Retransmission Request (hereinafter referred to as "HARQ") has been proposed.

Hereinafter, the structure of the W-CDMA communication system and the HARQ scheme will be described with reference to FIG. 1.

1 is a diagram schematically illustrating a structure of a general W-CDMA communication system.

The W-CDMA communication system includes a core network (hereinafter referred to as "CN") 100 and a plurality of radio network subsystems (hereinafter referred to as "RNS") 110 and 120 and a user. Terminal 130 is referred to as a user equipment (hereinafter referred to as "UE").

The RNS 110 and the RNS 120 are respectively referred to as a Radio Network Controller (hereinafter referred to as "RNC") and a plurality of base stations (Node Bs) (the term is used interchangeably as Node B or cell in the following description). It consists of. That is, the RNS 110 is composed of an RNC 111 and a plurality of Node Bs 113 and 115, and the RNS 120 is composed of an RNC 112 and a plurality of Node Bs 114 and 116. do.

RNCs are classified as Serving RNC (hereinafter referred to as "SRNC"), Drift RNC (hereinafter referred to as "DRNC"), or Control RNC (hereinafter referred to as "CRNC") depending on their role. . The SRNC and DRNC are classified according to their role for each UE. That is, the RNC managing information of the UE and in charge of data transmission with the core network becomes the SRNC of the UE, and when the UE data is transmitted / received to the SRNC through another RNC other than the SRNC, the RNC is the DRNC of the UE. do. The CRNC represents an RNC controlling each Node B.

Referring to FIG. 1, when the RNC 111 manages information of the UE 130, the RNC 111 becomes an SRNC, and the UE 130 moves so that the data of the UE 130 is RNC 112. The RNC 112 becomes a DRNC when it is transmitted and received through. The RNC 111 controlling the Node B 113 becomes the CRNC of the Node B 113.

Next, the HARQ scheme, in particular, the n-channel Stop And Wait Hybrid Automatic Retransmission Request (hereinafter referred to as "n-channel SAW HARQ") scheme will be described. A typical Automatic Retransmission Request (ARQ) scheme consists of the exchange of Acknowledgment (hereinafter referred to as "ACK") and retransmission packet data between the UE and the RNC. However, in the HARQ scheme, an error correction technique (hereinafter referred to as “FEC”) is applied to increase the transmission efficiency of the ARQ scheme. In the HSDPA scheme, ACK and retransmission packet data are exchanged between the UE and the base station. In addition, in the HSDPA scheme, the n-channel may be configured such that N processes may transmit packet data through processes other than the corresponding process on the sender even if an arbitrary process on the sender does not receive an ACK for its transmission. SAW HARQ method is introduced.

In the case of the Stop And Wait Automatic Retransmssion Request (hereinafter referred to as "SAW ARQ") scheme, the next packet data is transmitted only after receiving an ACK for the previous packet data. However, since the SAW ARQ scheme transmits the next packet data only after receiving the ACK for the previous packet data, channel SA efficiency is low.

In the n-channel SAW HARQ scheme, a plurality of packet data may be continuously transmitted through other configured processes without receiving an ACK for the previous packet data, thereby improving channel usage efficiency. That is, if n processes are set up between the UE and the Node B, and the receiver can identify each process through the process identifier transmission of the transmitter, the UE receiving these packet data may be By knowing which process the packet data received at that time is the packet data transmitted, it is possible to take a corresponding action.

As described above, since the hierarchical structure of the W-CDMA system using the HSDPA method requires an additional HARQ function to the MAC layer, the corresponding hierarchical structure is the existing hierarchical structure, that is, the hierarchical structure of the W-CDMA system not using the HSDPA method. Changed from. Specifically, in order to support the HSDPA scheme, a MAC-hs (High Speed MAC) entity is added to the MAC-c / sh (Common or Shared MAC) and MAC-d (Dedicated MAC) entity in the MAC hierarchy of the conventional W-CDMA system. Was implemented.

The MAC-hs entity has a main function for HARQ on the HS-DSCH channel to support the HSDPA scheme. The MAC-hs entity transmits an ACK to the base station if an error occurs for a data block received from a wireless channel, that is, packet data, and requests retransmission for an errored data block if an error occurs for the data block. A NACK is generated and transmitted to the base station.

2 is a diagram illustrating a protocol hierarchy of a communication system using a high speed forward packet access scheme to which the present invention is applied. Since the fast forward packet access method corresponds only to downlink data, only the downlink data will be described below.

Referring to FIG. 2, each packet data convergence protocol (PDCP) layer 201 and 231 is present in an SRNC on a transmitting side and a UE on a receiving side, respectively. That is, the transmitting PDCP layer 201 receives IP packet data from a higher layer, undergoes header compression, etc., and then transmits the data to the RLC 202, and receives the receiving PDCP layer. In operation 231, if the data received from the receiving side RLC 232 is header compressed, the data is decompressed and then transmitted to a higher layer.

The transmitting side RLC layer 202 segments and concatenates data received from the transmitting side PDCP layer 201 to form a packet date unit (RLC-PDU), which is a lower layer MAC layer 203. To send. The RLC layer 232 at the receiving side recovers an RLC-SDU (Service Data Unit) from data received from lower MAC layers, that is, the MAC-d 233 and the MAC-hs 234, and the PDCP layer 231 as an upper layer. ). In this case, the transmitting side RLC layer 202 is also responsible for the ARQ function, the receiving side RLC layer 232 may request the untransmitted data to the transmitting side RLC layer 202.

In general, the MAC layer is composed of a MAC-d layer and a MAC-hs layer, and as shown in FIG. 2, both the MAC-d layer 233 and the MAC-hs layer 234 exist in the UE-side MAC layer. Only the MAC-hs layer 221 exists in the base station Node B, and only the MAC-d layer 203 exists in the SRNC.

The MAC-d layer is a MAC entity for processing dedicated logical channels. A dedicated control channel (hereinafter referred to as "DCCH") and a dedicated traffic channel (hereinafter referred to as "dedicated traffic channel"). MAC channel "for dedicated logical channels such as " DTCH " In addition, the MAC-hs layer is a layer additionally implemented to support the HSDPA scheme as described above, and has a function for HARQ on the HS-DSCH as a main function.

In FIG. 2, when actual user data (IP packet data) arrives from the upper layer to the PDCP layer 201 of the SRNC, the PDCP layer 201 transfers the data to the RLC layer 202 using header compression or the like. The RLC layer 202 generates this RLC-PDU through segmentation and concatenation. In this case, the RLC layer 202 attaches a sequence number to each PDU header for reordering and ARQ functions.

The MAC-d layer 203 generates user data received from the RLC layer 202 as a MAC-d PDU, and generates the generated MAC-d PDUs as a frame protocol (“FP”) layer. Forward to 204. Here, the MAC-d PDU means that the MAC-d header is added to the user data received from the RLC layer 202, which is an upper layer, and the MAC-d PDU receives the MAC-d PDUs as an upper layer. Multiplexing related information indicating whether to be delivered is included. The FP layer 204 transforms the MAC-d PDUs received from the MAC-d layer 203 into an FP frame and then transfers the MAC-d PDUs to a transport bearer layer 205. The FP layer 204 concatenates multiple MAC-d PDUs into one FP frame, and the FP frame includes information on the priority of the concatenated MAC-d PDUs. Then, the transport bearer layer 205 allocates a transport bearer for the FP frames received from the FP layer 204, and transmits the transport bearer layer to the transport bearer layer 212 of the base station through the assigned transport bearer. do. Here, the transmission bearer layer 205 of the SRNC and the transmission bearer layer 212 of the base station are connected through an lub, which is an interface between the SRNC and the base station, and an Iur interface, which is an interface between the SRNC and the DRNC.

When the transport bearer layer 212 of the base station receives the FP frame from the transport bearer layer 205 of the SRNC, it forwards the received FP frame to the FP layer 211, the FP layer 211 is the transport bearer layer 212 The FP frame received from the frame is delivered to the MAC-hs layer 221. The MAC-hs layer 221 stores the received MAC-d PDUs in a corresponding priority queue by referring to the information on the priority included in the FP frame received from the FP layer 211 and physical layer (Physical). layer 222 transmits these MAC-d PDUs to the UE.

3 illustrates an RLC-AM (acknowledged mode) format, which is one of the RLC PDU formats currently used in RLC.

Referring to FIG. 3, D / C is a field indicating whether this PDU contains data or control information, and a 12-bit sequence number is used for reordering and ARQ stages of packet data. Serial number for retransmission. P is a polling bit for requesting a status report of a receiver, and HE indicates whether data is immediately followed or an additional header composed of a length indicator and an E bit. The length indicator indicates the length of the PDU, and includes several length indicators when several RLC SDUs are concatenated. The E bit indicates whether the next is a Length indicator or data.

Since the RLC layer uses an RLC PDU having a predetermined size, one RLC SDU arriving from an upper layer may be divided into several RLC PDUs. Currently used RLC PDU size is 320 bits or 640 bits. If 1500 bytes of IP packet data is transmitted, it should be divided into 38 (= 1500/40) or 19 (= 1500/80) RLC PDUs. do. Using a 320-bit RLC PDU and assuming that each RLC has 4 bytes of headers, the header overhead is 152 (= 4 * 38) bytes and padding bytes attached to fit the last RLC-PDU size to 40 bytes. Since the number is 20 (= 40 * 38-1500) bytes, the RLC overhead required to send an SDU of 1500 bytes totals 172 bytes.

In order to solve the problem of increasing the header overhead, the size of the RLC PDU may be increased, but in this case, the padding overhead attached to the small size of the RLC SDU increases. In addition, when processing the IP packet data of 1500 bytes in the Iur / Iub used for such IP transmission has a disadvantage that it is impossible to process a single IP transmission packet.

In order to solve the above problem, the RLC layer does not use a segmentation scheme in the recent HSDPA, but generates an RLC PDU size variably, and the scheme of applying the segmentation scheme in the MAC-hs layer is under discussion. However, in this case, since one RLC-PDU is divided into multiple MAC-hs PDUs, even if only one MAC-hs PDU fails in the HARQ stage, the entire RLC PDU must be retransmitted in the ARQ stage located in the SRNC stage. The problem arises.

The present invention proposes a scheme for preventing overhead in the RLC layer and MAC layer, in consideration of the radio and hardware resource situation managed by the base station to inform the SRNC of the size of the PDU that can be sent at once without splitting, Accordingly, the SRNC proposes a method of providing an RLC PDU method by determining whether to divide the RLC SDU.

According to an embodiment of the present invention, there is provided a packet data transmission method through a high speed forward packet access in a wideband code division multiple access system, the method comprising: a base station checking a radio resource situation or a hardware resource situation associated with a terminal; In consideration of the identified situation, a process of setting a maximum size of a Radio Link Control Packet Date Unit (RLC PDU) that the base station can transmit without division, and the maximum size of the set RLC PDU Transmitting the indicated maximum size information to the base station controller; The maximum size information is used to determine the size of at least one RLC PDU generated according to whether the RLC Service Data Unit (SDU) is divided.

An apparatus according to an embodiment of the present invention is a base station apparatus for transmitting packet data to a terminal through a fast forward packet connection in a wideband code division multiple access system, comprising: a radio resource monitoring unit for checking a radio resource situation related to a terminal; A hardware resource monitoring unit for checking the resource status of the hardware related to the terminal, and a radio link control packet data unit (RLC PDU) that can be transmitted without division by using signals received through the radio resource monitoring unit and the hardware resource monitoring unit. A size transmitter configured to set a maximum size of a Radio Link Control Packet Date Unit, and a message transmitter configured to generate and transmit a message including the maximum size information indicating the maximum size of the set RLC PDU to a base station controller; The maximum size information is used to determine the size of at least one RLC PDU generated according to whether the RLC Service Data Unit (SDU) is divided.

An apparatus according to another embodiment of the present invention is a base station control apparatus for transmitting packet data to a base station through a high speed forward packet access in a wideband code division multiple access system, wherein the base station, the base station can be transmitted without a radio A receiver for receiving the maximum size information of the link control packet data unit (RLC PDU) and whether the RLC service data unit (SDU) delivered from the upper layer can be made into an RLC PDU having a size smaller than or equal to the maximum size without splitting. And a radio link control unit for generating the RLC PDU and a data transmitter for transmitting the generated RLC PDU to the base station according to the confirmation result.
A method according to another embodiment of the present invention is a method for transmitting packet data to a base station through a high speed forward packet access in a wideband code division multiple access system, the radio link control that the base station can be transmitted without division Receiving a maximum size information indicating a maximum size of a Radio Link Control Packet Date Unit (RLC PDU), and the RLC service data unit (SDU) delivered from the upper layer is smaller than the maximum size without splitting; It is determined whether or not it can be made of the same size RLC PDU, and according to the result of the check to generate one RLC PDU having a size smaller or equal to the maximum size, or by dividing the RLC SDU is smaller than the maximum size Generating a plurality of RLC PDUs having the same size; Of the RLC PDU includes a step of transmitting to the base station.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that they may unnecessarily obscure the subject matter of the present invention. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

In the accompanying drawings and descriptions below, the CRNC does not specify a DRNC in a situation different from that of the SRNC. However, at this time, the RNSAP message sent from the SRNC to the DRNC is the same as the NBAP message sent to the Node-B from the SRNC described in the drawings and the description.

4 is a signaling flowchart according to an embodiment of the present invention, and illustrates a method of informing the SRNC by determining a maximum RLC PDU size that a node ratio can process at one time in consideration of its radio and hardware conditions.

Referring to FIG. 4, the Node-B 410 transmits maximum RLC PDU size information to the SRNC 420 using a Radio Link Parameter Update Indication message, which is an NBAP / RNSAP message. The information may also be transmitted to the SRNC using a control frame or other method of the frame protocol.

5 shows a configuration of a Node-B according to an embodiment of the present invention.

Referring to FIG. 5, a Node-B according to an embodiment of the present invention includes a radio resource monitoring unit 510, a hardware resource monitoring unit 520, an RLC PDU size determination unit 530, and a message generation / transmission unit. 540. The radio resource monitoring unit 510 and the hardware resource monitoring unit 520 respectively identify a situation of radio resources and hardware resources related to the terminal. Based on the information obtained from the radio resource monitoring unit 510 and the hardware resource monitoring unit 520, the Node-B determines the maximum RLC PDU size that the RLC PDU size determining unit 530 can transmit without splitting. This is transmitted to the SRNC through the message generator / transmitter 540.

6 is a flowchart illustrating the operation of a Node-B according to an embodiment of the present invention.

Referring to FIG. 6, first, in step 620, the Node-B is monitoring a radio resource or hardware resource situation. In step 630, the Node-B needs to change the size of the maximum RLC PDU that can be transmitted through HARQ at one time. Check if there is. As a result of the check, if the change is necessary, the maximum RLC PDU size information to be changed is transmitted to the SRNC.

7 is a diagram illustrating a configuration of an SRNC according to an embodiment of the present invention.

Referring to FIG. 7, an SRNC according to an embodiment of the present invention includes a message receiver 710, an RLC 720, and a downlink packet transmitter 730. The message receiving unit 710 receives a maximum RLC PDU size that Node-B can process without applying a partitioning scheme from Node-B and delivers it to RLC 720. The RLC 720 compares the size of the packet received from the higher layer with the maximum RLC PDU size received by the message receiver 710. If the RLC PDU size can be made less than or equal to the maximum RLC PDU size without splitting, the RLC 720 makes one RLC PDU without splitting the entire RLC SDU and sends it to Node-B, otherwise the RLC SDU is sent. After splitting into multiple RLC PDUs, they are sent to Node-B via FP (Frame Protocol).

8 is a flowchart illustrating the operation of an SRNC according to an embodiment of the present invention.

Referring to FIG. 8, it is assumed that the SRNC has already received the maximum RLC-PDU size information that can be sent at one time from the Node-B without splitting when starting the process in step 810. In addition, if this information is not received, the SRNC assumes that the default value is used as the maximum RLC-PDU size. Next, in step 820, the SRNC checks whether the RLC-SDU from the upper layer exists in the RLC layer. As a result of the check, if the RLC-SDU exists in the RLC layer, in step 830, the SRNC checks whether the RLC-SDU can be made equal to or smaller than the maximum RLC PDU size without splitting. If the RLC-SDU can be made less than or equal to the maximum RLC PDU size without splitting, the SRNC proceeds to step 850 to generate one RLC PDU without splitting, otherwise proceeds to step 840 and splits the RLC-SDU through splitting. Create multiple RLC PDUs from In step 860, the RLC PDUs generated in steps 840 and 850 are transmitted to the Node-B through the FP.

9 is a flowchart illustrating a process of setting a size of a maximum RLC PDU in Node-B according to an embodiment of the present invention.

Referring to FIG. 9, in step 920, the Node-B checks whether an RLC PDU to be sent to a current UE is well transmitted with a currently set maximum RLC PDU size. If the transmission is successful, the flow proceeds to step 940 and the Node-B checks whether a predetermined time T has elapsed since the current maximum RLC PDU size is set. Alternatively, in step 940, the Node-B may check whether a predetermined number of RLC PDUs are well transmitted to the UE from a time point when the current maximum RLC PDU size is set.

If it is determined in step 940 that a predetermined time has elapsed or a predetermined number of RKC PDUs are well transmitted, the process proceeds to step 960 and the Node-B increases the maximum RLC PDU size by a certain amount, and then proceeds to step 950 to newly set the maximum number. Deliver the RLC PDU size to the SRNC. On the other hand, if it is determined in step 940 that a predetermined time has not elapsed or a certain number of RKC PDUs are not transmitted well, the process proceeds to step 970 where the Node-B maintains the current maximum RLC PDU size.

On the other hand, if it is determined in step 920 that the RLC PDU to be sent to the current UE is not transmitted well with the currently set maximum RLC PDU size, the Node-B proceeds to step 930 and reduces the maximum RLC PDU size by a certain amount to step 950. Go ahead and send this new value to the SRNC.

10 is a flowchart illustrating a process of setting a maximum RLC PDU size in a Node-B according to another embodiment of the present invention. In another embodiment of the present invention, the size of an RLC PDU is set using a buffer status of Node-B and a channel quality indicator (CQI) value reported from the UE.

Referring to FIG. 10, in step 1020, the Node-B checks whether the amount of data currently present in the transmission buffer is smaller than a predetermined amount. If the amount of data is less than a certain amount, the process proceeds to step 1030 to maintain the maximum RLC PDU size in the current state. Otherwise, the method proceeds to step 1040 to determine whether the channel environment between the UE and the Node-B is good using the CQI information. To judge. As a result of the determination, if the channel environment between the UE and the Node-B is good, the process proceeds to step 1050 to increase the maximum RLC PDU size, otherwise proceeds to step 1060 to reduce or maintain the maximum RLC PDU size. In addition, if the maximum RLC PDU size is changed in step 1050 or 1060, the changed new maximum RLC PDU size value is transmitted to the SRNC in step 1070.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

In the present invention that operates as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, in the high speed forward packet access (HSDPA) method used in a wideband code division multiple access (WCDMA) system, the Node-B can send at a time without splitting in consideration of radio resources and hardware resource conditions managed by the Node-B. Inform SRNC of the size of the PDU.

In this way, the SRNC may support RLC PDU sizes of variable sizes. That is, in the case of a small packet, since one RLC SDU can be made into one RLC PDU without padding, the padding overhead can be significantly reduced compared to the conventional fixed RLC PDU size. In addition, in case of a packet smaller than the maximum RLC PDU size, one RLC SDU, which had to be divided into 320-bit or 640-bit size units, can be made into one RLC PDU without splitting, thereby significantly reducing header overhead. . In addition, in case of a very large packet, that is, larger than the maximum RLC PDU size, since one RLC SDU, which had to be split into a predetermined size unit, can be made into one RLC PDU without splitting, the header overhead is significantly reduced. There is.

In addition, compared to the method of splitting in the MAC-hs layer, when splitting one RLC-PDU into multiple MAC-hs PDUs in the MAC-hs, even if only one MAC-hs PDU fails in the HARQ stage, the entire RLC Although there is a problem in that the PDU needs to be retransmitted, the present invention can solve this problem by performing division in the RLC stage.

In addition, when using an IP transport (IP transport), due to the maximum RLC header it is possible to prevent the size of the IP packet in the maximum transport layer larger than the maximum packet size that can be supported by the IP layer.

Claims (10)

A packet data transmission method through a high speed forward packet access in a wideband code division multiple access system, Checking, by the base station, a radio resource situation or a hardware resource situation related to the terminal; Setting the maximum size of a Radio Link Control Packet Date Unit (RLC PDU) that the base station can transmit without splitting in consideration of the identified situation; Transmitting maximum size information indicating the maximum size of the configured RLC PDU to a base station controller; The maximum size information is used to determine the size of at least one RLC PDU generated according to whether the RLC Service Data Unit (SDU) is divided. The method of claim 1, The process of setting the maximum size, Determining whether one RLC PDU corresponding to the maximum size of the RLC PDU is normally transmitted to the UE; Resetting the maximum size of the RLC PDU by a predetermined size if it is not normally transmitted; If it is determined that the transmission has been successfully performed, checking whether a predetermined time has elapsed or if a predetermined number of RLC PDUs corresponding to the maximum size of the RLC PDU have been transmitted to the terminal; As a result of the checking, if a predetermined time has not elapsed or if the number of RLC PDUs corresponding to the maximum size of the RLC PDU has been normally transmitted to the UE by a predetermined number, the maximum size of the RLC PDU is increased by a predetermined size and reset. And maintaining a maximum size of the RLC PDU when a predetermined time has elapsed or when the number of RLC PDUs corresponding to the maximum size of the RLC PDU has not been normally transmitted to the UE by a predetermined number. . The method of claim 1, The process of setting the maximum size, Identifying the amount of data currently present in the transmission buffer of the base station; If the amount of data is smaller than a predetermined amount, maintaining the maximum size of the RLC PDU; If the amount of data is greater than the predetermined amount, determining whether the channel environment of the terminal is good; As a result of the determination, if the channel environment of the terminal is good, the maximum size of the RLC PDU is reset by increasing the predetermined size, and if the channel environment of the terminal is not good, the step of lowering or maintaining the maximum size of the RLC PDU is included. Packet data transmission method characterized in that. The method of claim 1, When the RLC SDU may be generated as an RLC PDU having a size smaller than or equal to the maximum size, the RLC SDU is generated as one RLC PDU having a size smaller than or equal to the maximum size without dividing the RLC SDU, or when the RLC SDU is And dividing and generating a plurality of RLC PDUs having a size smaller than or equal to the maximum size. A base station apparatus for transmitting packet data to a terminal through a high speed forward packet access in a wideband code division multiple access system, A radio resource monitoring unit for checking a radio resource situation related to a terminal; A hardware resource monitoring unit for identifying a resource state of hardware related to the terminal; A size determining unit that sets a maximum size of a radio link control packet data unit (RLC PDU) that can be transmitted without division by using signals received through the radio resource monitoring unit and the hardware resource monitoring unit. Wow, A message transmitter for generating a message including the maximum size information indicating the maximum size of the set RLC PDU and transmitting the message to a base station controller; The maximum size information is used to determine the size of at least one RLC PDU generated according to whether the RLC service data unit (SDU) divided. A base station control apparatus for transmitting packet data to a base station through a high speed forward packet access in a wideband code division multiple access system, A receiving unit for receiving, from the base station, maximum size information indicating a maximum size of a radio link control packet data unit (RLC PDU) that the base station can transmit without division; It is determined whether an RLC service data unit (SDU) delivered from an upper layer can be made into an RLC PDU having a size smaller than or equal to the maximum size without splitting, and having a size smaller than or equal to the maximum size according to the check result. A radio link control unit generating one RLC PDU or dividing the RLC SDU to generate a plurality of RLC PDUs having a size smaller than or equal to the maximum size; And a data transmitter for transmitting the generated one RLC PDU or a plurality of RLC PDUs to the base station. The method of claim 5, The size determining unit, It is determined whether one RLC PDU corresponding to the maximum size of the RLC PDU is normally transmitted to the UE. If the one RLC PDU is not normally transmitted, the maximum size of the RLC PDU is reduced by a predetermined size and reset. If one RLC PDU is normally transmitted, it is determined whether a predetermined time has elapsed or if a predetermined number of RLC PDUs corresponding to the maximum size of the RLC PDU are transmitted to the UE. As a result of the checking, if a predetermined time has not elapsed or if the number of RLC PDUs corresponding to the maximum size of the RLC PDU has been normally transmitted to the UE by a predetermined number, the maximum size of the RLC PDU is increased by a predetermined size and reset. And maintaining the maximum size of the RLC PDU if a predetermined time has elapsed or if the number of RLC PDUs corresponding to the maximum size of the RLC PDU has not been normally transmitted to the UE. The method of claim 5, The size determining unit, Confirm the amount of data currently present in the transmission buffer of the base station, and maintain the maximum size of the RLC PDU if the amount of data is less than a predetermined amount; and if the amount of data is greater than the predetermined amount, the terminal If the channel environment of the terminal is good, the determination result, if the channel environment of the terminal is good, the maximum size of the RLC PDU is reset by increasing the predetermined size, if the channel environment of the terminal is not good, the maximum size of the RLC PDU Base station apparatus characterized in that to lower or maintain. The method of claim 6, The radio link control unit, When the RLC SDU may be generated as an RLC PDU having a size smaller than or equal to the maximum size, the RLC SDU is generated as one RLC PDU having a size smaller than or equal to the maximum size without dividing the RLC SDU, or the RLC SDU is generated. And dividing to generate a plurality of RLC PDUs having a size smaller than or equal to the maximum size. A method for transmitting packet data to a base station through a high speed forward packet access in a wideband code division multiple access system, Receiving, from the base station, maximum size information indicating a maximum size of a Radio Link Control Packet Date Unit (RLC PDU) that the base station can transmit without division; It is determined whether an RLC service data unit (SDU) delivered from an upper layer can be made into an RLC PDU having a size smaller than or equal to the maximum size without splitting, and having a size smaller than or equal to the maximum size according to the check result. Generating one RLC PDU or dividing the RLC SDU to generate a plurality of RLC PDUs having a size smaller than or equal to the maximum size; And transmitting the generated one RLC PDU or a plurality of RLC PDUs to the base station.

Images