KR100678698B1 - Method and apparatus for transmitting data for use in mobile communication system - Google Patents

Abstract

A method for transmitting data in a mobile communication system and a system thereof are provided to enhance efficiency in transmitting packet data and to reduce a data loss due to handoff even when it occurs. A method for transmitting data in a mobile communication system comprises the following several steps. A DMC(DO Media Controller) of an ANC(Access Network Controller) assigns a data buffer for temporally storing packet data to a specific data call(S710). The DMC receives the packet data, to be transmitted to a mobile communication terminal, from an IPP or an RPP via a GAN(Gateway Access Node)(S720). The DMC temporarily stores the packet data in the data buffer, and notifies a DEC(DO channel Element Controller) that there exists the packet data to be transmitted to the mobile communication terminal(S730). The DEC assigns a traffic channel to the mobile communication terminal(S740) and notifies the DMC that assignment of the traffic channel is completed(S750). The DMC transmits the stored packet data to the DEC(S760). The DEC transmits the received packet data to the mobile communication terminal in real time while not performing a scheduling or a data buffering operation additionally(S770).

Description

Method and apparatus for transmitting data in mobile communication system {Method and Apparatus for Transmitting Data for Use in Mobile Communication System}

1 is a block diagram schematically showing the configuration of a conventional CDMA 2000 1x-EVDO system;

2 is a block diagram schematically illustrating an apparatus for processing packet data transmission between a base station and a base station controller in a conventional CDMA 2000 1x-EVDO system;

3 is a flowchart illustrating a packet data transmission method between a base station and a base station controller in a conventional CDMA 2000 1x-EVDO system;

4 is an exemplary view for explaining a flow control method between a base station and a base station controller in a conventional CDMA 2000 1x-EVDO system;

5 is an exemplary view for explaining a flow control method in a base station of a conventional CDMA 2000 1x-EVDO system;

6 is a block diagram schematically showing a data transmission apparatus of a mobile communication system according to an embodiment of the present invention;

7 is a flowchart illustrating a data transmission method of a mobile communication system according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: mobile communication terminal 100: base station

110: 1x base station (BTS) 120: EV-DO base station (ANTS)

121, 620: DEC 200: base station controller

210, 620: 1x Base Station Controller (BSC) 220, 630: EV-DO Base Station Controller (ANC)

221: DCC 223, 632: DMC

310: mobile switching center (MSC) 320: gateway access node (GAN)

321: IPP 323: RPP

610: AN

The present invention relates to a data transmission method and apparatus of a mobile communication system. More specifically, in the transmission of packet data in the mobile communication system, the base station controller performs buffering and scheduling functions performed by the base station, thereby improving the efficiency of transmitting the packet data, and The present invention relates to a data transmission method and apparatus of a mobile communication system for reducing data loss due to handoff even when an off occurs.

A mobile communication network providing a mobile communication service including a voice call service and a wireless data service is implemented as a mobile communication system. The mobile communication system evolves to IS-95A, IS-95B, Code Division Multiple Access (CDMA) 2000 1x, EVDO, EVDV, etc. when synchronous, and Global System for Mobile Communications (GSM) and Wideband (WCDMA) when asynchronous. Evolving to CDMA) system.

The IS-95A / B network separated voice and line data at the exchange of the mobile communication system, and provided service by changing the circuit data into packet data by the interworking device (IWF). The data rate reached 56Kbps at IS-95B. CDMA 2000 1x service uses the IS-95C network, which has evolved from the existing IS-95A / B network, to enable wireless Internet at up to 144bkbps, much faster than the speed supported by the existing IS-95A / B network, 14.4kbps or 56kbps. In the IS-95C network, a data core network (DCN) was introduced to support high-speed data services, a packet data serving node (PDSN) was connected to the Internet, and data was received by the introduction of a home agent (HA). Mobility management for is possible.

The CDMA 2000 EVDO system is a packet data dedicated network supporting the highest data transfer rate of 2.4576 Mbps. The CDMA 2000 EVDO system is generally implemented together with the CDMA 2000 1x system and used as a CDMA 2000 1x-EVDO system. The CDMA 2000 1x-EVDO system provides a voice service using a CDMA 2000 1x system and a data service using a CDMA 2000 EVDO system. In the following description, a CDMA 2000 1x-EVDO system will be described in detail by abbreviating the CDMA 2000 1x system as a '1x system' and a CDMA 2000 EVDO system as an 'EVDO system'.

The 1x system provides a unidirectional high speed data service with a transmission rate of up to 307.2 Kbps in the form of a combination of a circuit network and a packet network. In contrast, the EVD0 system provides bidirectional high speed packet data service having a transmission rate of up to 2.4 Mbps for packet data only. However, these EVDO systems are currently used interchangeably with existing 1x systems.

1 is a block diagram schematically illustrating a configuration of a conventional CDMA 2000 1x-EVDO system. As illustrated, the EVDO system and the 1X system are mixed in hardware in one base station 100 or the base station controller 200, and operations are performed separately. In other words, the base station 100 is provided with a channel card 120 for the EVDO system and a channel card 110 for the 1x system, respectively. The base station controller 200 also includes a data processing board 220 for processing packet data transmitted / received in the EVDO system and a data processing board 210 for processing data transmitted / received in the 1x system.

Accordingly, when packet data is transmitted from the mobile communication system to the mobile communication terminal 10, the packet data is transmitted using the EVDO system of the base station 100 and the base station controller 200, and in the case of voice or line data, using a 1x system. Is sent.

In addition, the basic devices constituting the 1x system and the EVDO system illustrated in FIG. 1 will be briefly described. The EVDO system may include a gateway access node 320 (GAN) and a packet data serving node 360 (PDSN). ), A data location register (DLR) and an access network authentication device (370, Access Network-Authorization, Authentication and Accounting (AN-AAA)), and the 1x system includes a mobile switching center (310). Switching Center (MSC), Home Location Register (HLR) and Visitor Location Register (330, VLR).

Among these, the gateway access node 320 may be connected to the base station controller 200 to provide a communication path and a handoff path between the base stations 100 through an ATM switch, and a packet data call may be transmitted to a node for processing packet data. It provides a route, and performs a matching function with the packet data serving node 360, the data location register 350, the access network authentication device 370.

The data location register 350 is connected to the base station controller 200 through the gateway access node 320 to perform mobility maintenance and session control functions for the subscriber, and the packet data serving node 360 sends packets to the subscriber. The data network is provided, and the access network authentication device 370 performs authentication on the mobile communication terminal 10.

While the mobile communication terminal 10 receives the packet data service from the EVDO system, the mobile station 10 moves to another sector area within the base station 100 or moves out of the service area under the control of the base station 100. When moving to the area, hand-off is performed.

Handoff in the mobile communication system refers to a technology for switching the call path between the mobile communication terminal and the base station so that the call can be maintained even if the mobile communication terminal leaves the service area of the base station or sector currently being provided with the service.

When performing the handoff with respect to the mobile communication terminal 10 in the EVDO system, the EVDO system transmits information about a previous base station and information about a newly neighboring base station from the mobile communication terminal 10 as a route update signal. Receives and allocates a communication resource, that is, a pilot channel, a media access control (MAC) channel, a control channel, a traffic channel, a data request channel (DRC) channel, etc. to the mobile communication terminal 10 based on newly adjacent base station information. do. After allocating a communication resource for the mobile communication terminal 10, the EVDO system transmits a traffic channel assignment (TCA) signal for handoff to the mobile communication terminal 10 to receive a response message signal and complete the traffic channel. A handoff is performed by receiving a (TCC) signal or the like.

When the base station 100 requests the handoff to the base station controller 200 according to the handoff request of the mobile communication terminal 10, the base station controller 200 includes the base station (including radio resource information for the handoff target base station). 100 to request a traffic channel to be allocated, and the base station 100 transmits a response message thereto. Thereafter, the base station controller 200 calculates a DRC length, a DRC gain, and the like, instructs the handoff to the base station 100, and transmits network information SendFrameCmd including the DRC length and channel gain information.

Accordingly, the base station 100 allocates a traffic channel to the mobile communication terminal 10, the mobile communication terminal 10 reports that the traffic channel allocation is completed to the base station 100, and the base station 100 reports the base station controller ( 200) report that channel allocation is complete. Subsequently, the handoff target base station transmits omnidirectional channel information to the mobile communication terminal 10, and the mobile communication terminal 10 transmits reverse channel information to the handoff target base station. do.

2 is a block diagram schematically illustrating an apparatus for transmitting packet data between a base station and a base station controller of a conventional CDMA 2000 1x-EVDO system.

If there is a data call attempt from the subscriber, that is, the mobile communication terminal 10, as shown in FIG. 2, the base station 100 uses the base station controller 200 through the DEC 121 (DO channel element controller) to track the state of the call. The call tracking message is transmitted to the call tracking system, and the call information of the mobile communication terminal 10 and the resource occupancy state, call processing progress state and throughput of the system are received from the base station controller 200 in real time.

When the DMC 223 (DO Media Controller) of the base station controller 200 receives the call tracking message from the DEC 121, the DMC 223 transmits the requested call tracking message to the DCC 221 and the DCC 221 transmits the requested call tracking message. Receive a call trace message from the DMC 223 to confirm whether the test can be performed. The DCC 221 sends a call tracking report message including the result and a call tracking report message including call processing and resource information for the mobile communication terminal 10 in which call tracking is set up to the DMC 223.

Receiving the call tracking report message, the DMC 223 sends the call tracking report message to the DEC 121. In addition, the DMC 223 periodically fills a call tracking report message with information such as call processing, resource information, and throughput for the mobile communication terminal 10 in which call tracking is set, and sends it to the DEC 121.

On the other hand, the DMC 223 analyzes the parameters from the corresponding message for the call tracking received from the DEC 121, and if the network ID is the access network authentication device 370 or the data location register 350, IPP (call tracking message) 321, and delivers to the RPP 323 if the packet data serving node 360. The IPP 321 or the RPP 323 of the GAN 320 tracks the message according to the received call tracking message, collects data for a set time, and delivers the data to the DMC 223.

3 is a flowchart illustrating a packet data transmission method between a base station and a base station controller in a conventional CDMA 2000 1x-EVDO system.

Referring to FIG. 3, according to the configuration of FIG. 2, the DEC 121 transmits a forward request indication (Forward DesiredInd) to the DMC 223 (S401), and then a flow control instruction (Flow ControlInd). It informs its buffer window size every 500msec through the (S403). The maximum value of the current buffer window size is 10 in the case of a signal packet, 150 in the case of a retransmission RLP packet, a new RLP packet is 400, and the DEC 121 is 10 for flow control with the DMC 223, respectively. , Software buffers 123 having sizes of 150, 400 are used, and hardware buffers 125 having sizes of 4, 8, and 16 are used for flow control instructions with a DSP (Digital Signal Processor).

The flow control instruction is managed by Programmable Loading Data (PLD) so that the operator can change the parameter value and is transmitted every 500 msec (Flow Control Watchdog Time). When the DMC 223 receives the flow control instruction from the DEC 121, the DMC 223 calculates the usable window size (S405), and the number of available window sizes until the next flow control instruction is received. Only the network information (SendFrameCmd) is transmitted to the DEC 121 (S407).

That is, when the DEC 121 informs the DMC 223 of its buffer window size every 500 msec through the flow control, the DMC 223 only has the number of usable windows. The network information is transmitted to the DEC 121.

4 is an exemplary view for explaining a flow control method between a base station and a base station controller in a conventional CDMA 2000 1x-EVDO system.

When the DMC 223 receives the flow control instruction from the DEC 121, the size of the available window UsableWindow indicated by the DEC 121 and (b) as shown in FIG. As shown, the size of the next frame to be transmitted (NumFrameToBeTransmitted) is calculated according to the size of the frame (NumFrameInFlight) of the packet data being transmitted, and the available window until the next flow control instruction is received as shown in (c). Only the number of network information (SendFrameCmd) is transmitted to the DEC 121.

It is an exemplary view for explaining a flow control method in a base station of a conventional CDMA 2000 1x-EVDO system.

As shown in (a) of FIG. 5, when the DSP gives the DEC 121 a signal that the frame transmission to the mobile communication terminal 10 is completed (Encode Done No. 3), the DEC 121 is a hardware buffer 125. ), And when the packet data (Forward MAC Packet) is received from the DMC 223 as shown in (b) of FIG. 5, the hardware buffer 125 is examined by checking the hardware buffer 125 every slot (1.66 msec). If there is packet data to be transmitted to the DSP by the DEC 121, the buffer is allocated and transferred to the DSP.

As described above, in the packet data transmission method of the EV-DO system, the packet data is transferred from the upper system DMC 223 to the lower system DEC 121, and the DEC 121 is configured to receive the packet data. Perform buffering. That is, when the packet data is received from the RPP 323, the DMC 223 sends the packet data directly to the DEC 121, and the DEC 121 stores the data in a buffer. Allocate a channel.

Accordingly, in the DEC 121, since the buffering occurs until the received packet reaches a predetermined amount, the transmission delay of the forward packet data occurs, and the transmission efficiency decreases because the transmission speed per hour is gradually increased.

In particular, in the above-described conventional data transmission method, the mobile communication terminal 10 moves to another base station in a state in which the DEC 121 receives a part of packet data to be transmitted from the DMC 223 to the mobile communication terminal 10. When the handoff occurs due to the movement, the DMC 223 drops the packet data including a part of the packet data that was previously given to the base station 100 to the DEC 121 of the other base station to which the mobile communication terminal 10 has moved. Since the DMC 223 transmits the same packet data to the DEC 121 twice when the mobile communication terminal 10 is handed off, the transmission efficiency is lowered.

In order to solve this problem, the present invention, in transmitting the packet data in the mobile communication system, by the base station controller to perform the buffering (Buffering) and scheduling (Scheduling) function to perform, the efficiency of transmitting the packet data It is an object of the present invention to provide a data transmission method and apparatus for a mobile communication system to improve the performance and to reduce data loss due to handoff even when a handoff occurs.

In order to achieve the above object, the present invention provides a packet data transmission apparatus including a base station and a base station controller as a wireless base station of a mobile communication system for transmitting packet data to a mobile communication terminal. a) the base station controller receiving and buffering the packet data; (b) the base station controller notifying the base station that there is packet data to transmit to the mobile communication terminal; (c) being informed that the base station controller has allocated a traffic channel from the base station to the mobile communication terminal; And (d) the base station controller transmitting the packet data to the base station to control the base station to transmit the packet data to the mobile communication terminal.

According to another object of the present invention, in the Code Division Multiple Access (CDMA) 2000 1x-EVDO system, an apparatus for receiving packet data from at least one of IPP and RPP and transmitting the packet data to the mobile communication terminal is provided. A base station including a DEC (DO Channel Element Controller) for allocating a traffic channel and immediately transmitting the packet data to a mobile communication terminal; And a DMC for receiving and buffering packet data from one or more of IPP and RPP, transmitting to the DEC that there is packet data to be transmitted to the mobile communication terminal, and transmitting the packet data to the DEC when notified that the traffic channel has been allocated from the DEC. It provides a packet data transmission apparatus of a mobile communication system comprising a base station controller including a DO Media Controller.

In addition, according to another object of the present invention, in the packet data transmission method between the base station and the base station controller of the Code Division Multiple Access (CDMA) 2000 1x-EVDO system, (a) preparing a data buffer in the DMC of the base station controller ; (b) if packet data is received from the RPP and IPP at the base station controller, temporarily storing it in a data buffer; (c) informing the DEC of the base station that there is data to be transmitted to the DMC; (d) the DEC assigning a traffic channel; (e) the DEC notifying the DMC of the completion of traffic channel assignment; And (f) the DMC transmitting the packet data to the DEC.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, in describing a preferred embodiment of the present invention, it is assumed that the mobile communication system is a Code Division Multiple Access (CDMA) 2000 1x-EVDO (Evolution Data Only) system. However, the mobile communication system used in the present invention is not limited to this assumption, but may be applied to other mobile communication systems such as a wideband CDMA (WCDMA) system that provides a packet data service.

In this case, the names, terms, and roles of each system may be different from the names, terms, and roles described below. However, the technical spirit of the present invention is not limited to the names, terms, and roles, but is a mobile communication terminal in a mobile communication system. It is not provided with a buffering function and a scheduling function for allocating a wireless channel and transmitting packet data in a transmission device directly connected to a mobile communication terminal, but in a control device for controlling the transmission device. It can be applied to improve the transmission efficiency of data.

6 is a block diagram schematically illustrating an apparatus for transmitting packet data in a mobile communication system according to an exemplary embodiment of the present invention.

An apparatus for transmitting data in a mobile communication system according to an exemplary embodiment of the present invention includes an EVDO transmitter (ANTS: ANTS) 620 and an EVDO controller (ANC) for an EV-DO system. , Hereinafter referred to as 'ANC', performs location registration to identify the location of the mobile communication terminal 10 existing in the cell area under its control, and performs voice and data communication with the mobile communication terminal 10. Allocates a radio channel for

Here, the ANTS 620 receives the data call request signal from the mobile communication terminal 10 through the traffic channel of the signal channel and transmits it to the ANC 630. The ANTS 620 is a network endpoint device of the EVDO system that is directly connected to the mobile communication terminal 10 by performing baseband signal processing, wired / wireless conversion, and wireless signal transmission and reception.

When the ANTS 620 according to the preferred embodiment of the present invention receives a data call request signal from the mobile communication terminal 10, the DNC (DO Media Controller) 632 of the ANC 630 to track the status of the requested data call. Sends a call tracking message to the DMC 632, and temporarily or periodically receives and confirms a call tracking report message including call processing information, resource information, and throughput information about the data call from the DMC 632; When a notification is received that there is packet data to be transmitted to the mobile communication terminal 10, the mobile communication terminal 10 allocates a traffic channel, notifies the DMC 632 that the allocation of the traffic channel is completed, and the DMC 632. When receiving data from the mobile station 10 includes a DEC (DO Channel Element Controller, 622) for immediately transmitting the data.

The ANC 630 controls the ANTS 620 and controls transmission outputs of the mobile communication terminal 10 and the ANTS 620, determines soft handoff and hard handoff between cells, and transcodes ( Transcoding and Vocoding, Global Positioning System (GPS) clock distribution, and operation and maintenance functions for wireless access networks, that is, data transmission devices, are performed.

When the ANC 630 according to the preferred embodiment of the present invention receives the call tracking message from the mobile communication terminal 10, the ANC 630 transmits the call tracking message to the DCC (Data Call Controller) 221, which is a result of whether the test can be performed from the DCC 221. DMC 632 for receiving the call tracking response message and the aforementioned call tracking report message, sending the call tracking report message to DEC 121, and periodically sending the call tracking report message to DEC 121.

In addition, the DMC 632 analyzes the parameters of the call tracking message received from the DEC 622 and transmits the call tracking message to the IPP 321 if the network ID is the access network authentication device 370 or the data location register 350. If the packet data serving node 360 is transmitted to the RPP 323, and receives data collected for a predetermined time from the IPP 321 and the RPP 323 and adds it to the call tracking report message and transmits it to the DEC 622. do.

In addition, the DMC 632 includes a data buffer for temporarily storing packet data received from the IPP 321 or the RPP 323, and temporarily receives the packet data to be transmitted to the mobile communication terminal 10 in the data buffer. And a message or signal notifying the DEC 622 that the packet data to be transmitted to the mobile communication terminal 10 is transmitted, and when notified that the allocation of the traffic channel is completed from the DEC 622, it is stored in the data buffer. Send data to DEC 622.

In addition, when the ANC 630 according to the preferred embodiment of the present invention receives a call tracking message from the DMC 632, it checks whether the test can be performed on the corresponding call, that is, the data call, and then includes a call tracking including a confirmation result. DCC 221 generating a response message and transmitting to DMC 632.

Accordingly, the apparatus for transmitting packet data of a mobile communication system according to an exemplary embodiment of the present invention includes an ANTS 620 as an EVDO base station and an ANC 630 as an EVDO base station controller as a wireless base station (AN) 610 of a mobile communication system. In the transmission of packet data to the mobile communication terminal 10, the ANC (SNC) does not perform scheduling and buffering for transmitting packet data in the DEC 622 of the ANTS 620 as in a conventional method. By performing in the DMC 632 of 630, it prevents transmission delay and transmission inefficiency that may occur for transmitting packet data in the DEC 622, and the same packet data even when the mobile terminal 10 is handed off To avoid inefficiency of double transmission.

Hereinafter, a method of transmitting packet data to the mobile communication terminal 10 by performing scheduling and buffering in the DMC 632 using the packet data transmission apparatus of the mobile communication system according to an exemplary embodiment of the present invention. Explain.

7 is a flowchart illustrating a packet data transmission method of a mobile communication system according to an embodiment of the present invention.

As described with reference to FIG. 6, the DMC 632 of the ANC 630 of the transmission apparatus prepares for transmission of packet data by allocating a data buffer for temporarily storing packet data for a specific data call (S710). At this time, the DMC 62 receives packet data to be transmitted from the IPP 321 or the RPP 323 to the mobile communication terminal 10 through the GAN 320, that is, the GAN 320 (S720).

Upon receiving the packet data, the DMC 632 temporarily stores the data in the data buffer (S720), and notifies the DEC 622 that the packet data to be transmitted to the mobile communication terminal 10 (S730). The DEC 622 notified of the packet data is allocated to the mobile communication terminal 10 (S740), and notifies the DMC 632 that the allocation of the traffic channel is completed (S750).

Notified that the allocation of the traffic channel has been completed, the DMC 632 transmits packet data temporarily stored in the data buffer to the DEC 622 (S760), and the DEC 622 does not perform further scheduling or data buffering. Instead, the received packet data is transmitted to the mobile communication terminal 10 in real time (S770).

As described above, according to the present invention, the DEC 622 of the ANTS 620 does not perform scheduling and buffering of the packet data to transmit the packet data to the mobile communication terminal 10, and the DMC 632 of the ANC 630. Since the packet data is transmitted to the mobile communication terminal 10 through the DEC 620 after the scheduling and the buffering of the packet data, the buffering and the traffic of the packet data performed in the DEC 622 of the ANTS 620 Transmission delay of forward packet data according to scheduling for channel allocation can be prevented.

In addition, when the mobile communication terminal 10 handoffs between the ANTS 620, the ANC 630 performs scheduling and buffering of packet data. Therefore, packet data transmitted to the ANTS 620 before handoff is performed. There is no need to resend, which avoids the inefficiency of sending packet data twice.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the base station controller does not perform the scheduling and buffering of the packet data in order to transmit the packet data to the mobile communication terminal in the same manner as a packet data transmission method in a mobile communication system. After the channel performs scheduling and buffering of the packet data, the packet data may be transmitted to the mobile communication terminal, thereby preventing transmission delay of the forward packet data according to the buffering and scheduling of the packet data that was performed at the base station. .

In addition, when the mobile communication terminal handoffs between base stations, since the base station controller performs scheduling and buffering of the packet data, it is not necessary to resend the packet data transmitted to the base station before the handoff. Inefficiency can be prevented.

Claims (5)

A wireless base station of a mobile communication system for transmitting packet data to a mobile terminal, the packet data transmission apparatus including a base station and a base station controller, the method of transmitting the packet data, comprising: (a) the base station controller receiving and buffering the packet data; (b) the base station controller notifying the base station that there is the packet data to transmit to the mobile communication terminal; (c) being informed by the base station controller that the base station has allocated a traffic channel to the mobile communication terminal; And (d) the base station controller transmitting the packet data to the base station to control the base station to transmit the packet data to the mobile communication terminal; Packet data transmission method of a mobile communication system comprising a. The method of claim 1, wherein in step (d), The base station, upon receiving the packet data, immediately transmits the packet data to the mobile communication terminal using the traffic channel. An apparatus for receiving packet data from at least one of IPP and RPP and transmitting the packet data to a mobile communication terminal in a Code Division Multiple Access (CDMA) 2000 1x-EVDO system, A base station including a DEC (DO Channel Element Controller) for allocating a traffic channel to the mobile communication terminal and immediately transmitting the packet data to the mobile communication terminal; And Receive and buffer the packet data from at least one of the IPP and the RPP, and transmit to the DEC that there is the packet data to be transmitted to the mobile communication terminal, and if notified that the traffic channel has been allocated from the DEC, the DEC. A base station controller including a DMC (DO Media Controller) for transmitting the packet data to the Packet data transmission apparatus of a mobile communication system comprising a. A packet data transmission method between a base station and a base station controller of a code division multiple access (CDMA) 2000 1x-EVDO system, (a) preparing a data buffer in the DMC of the base station controller; (b) if packet data is received from the RPP and IPP at the base station controller, temporarily storing the data in the data buffer; (c) informing the DEC of the base station that there is data to be transmitted to the DMC; (d) the DEC allocating a traffic channel; (e) the DEC notifying the DMC of the completion of traffic channel allocation; And (f) the DMC sending the packet data to the DEC Method for transmitting packet data in a mobile communication system comprising a. The method of claim 4, wherein the DEC, Receiving the packet data from the DMC and immediately transmitting the packet data to the traffic channel.

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