KR100425080B1 - System and Method for Call Setup for Use in CDMA 2000 1x EV-DO System - Google Patents

Abstract

PURPOSE: An EV-DO system for setting a call of a connected terminal and a method therefor are provided to set up a call by sending a TCA(Traffic Channel Allocation) signal one more time if a reverse response signal is not received for a certain time after the TCA has been transmitted. CONSTITUTION: An HAT(Hybrid Access Terminal)(110) supports a 1x system for voice or data transmission and reception with an EV-DO system, transmits a call connection request signal to the EV-DO system, and transmits a reverse response signal to the EV-DO system when receiving a TCA signal from the EV-DO system, and transmits a traffic channel completion signal to the EV-DO when receiving a recognition signal with respect to the TCA signal, thereby setting up a call with the EV-DO system. An EV-DO transmitter(124) transmits and receives packet data to and from the HAT(110). An EV-DO controller(134) controls packet data transmission service of the EV-DO transmitter(124), transmits the TCA signal to the HTA(110) when receiving the call connection request signal from the HAT(110), and repeatedly re-transmits the TCA signal if there is no response signal to the TCA signal from the HTA(110), thereby completing call set-up with the HTA(110).

Description

EV-DO system for establishing call of access terminal and method thereof {System and Method for Call Setup for Use in CDMA 2000 1x EV-DO System}

The present invention relates to an EV-DO system and method for setting up a call of an access terminal in a multimedia mobile communication system for transmitting and receiving voice and data at high speed. More specifically, when the hybrid terminal wanting to provide multimedia services attempts to connect to the EV-DO system, the EV-DO system transmits a traffic channel assignment (TCA) signal for call setup to the hybrid terminal. The present invention relates to an EV-DO system and method for setting up a call of an access terminal to transmit a traffic channel assignment signal once more when a reverse response signal is not received from a hybrid terminal for a predetermined time so that call setup is performed.

The mobile communication system has been developed through a first generation analog AMPS (Advanced Mobile Phone Systems) method, a second generation cellular (Celluar) / personal communication service (PCS) method, and recently, a third generation high speed data. International Mobile Telecommunication-2000 (IMT-2000), which is a communication, has been developed and commercialized.

Channel Size 1.25 MHz 1.25 MHz service Data Optimized (Only) Mixed Voice Data Peak Data Rate 2.457 Mbps downlink153.6 Kbps uplink 5.184 Mbps downlink614.4 Kbps uplink 2G compatibility Incompatible Compatible Modulation QPSK, 8-PSK, 16-QAM QPSK, 8-PSK, 16-QAM, 64-QAM Voice handoff Not supported Same as IS-95 and IS-2000 Data handoff F: fast cell selection R: soft F: fast cell selection R: soft Multiple access method Downlink (TDM), Uplink (CDMA) CDMA

In the following description, EV-DO will be described in detail by abbreviating CDMA 2000 1X system as “1X system” and CDMA 2000 1x EV-DO system as “EV-DO system”.

The 1X system provides a one-way high-speed data service with a transmission rate of up to 307.2 Kbps in the form of a mixed circuit circuit and packet network. In contrast, the EV-D0 system provides bidirectional high speed packet data service having a transmission rate of up to 2.4 Mbps for packet data only.

However, these EV-DO systems are currently used interchangeably with existing 1X systems. That is, the EV-DO system and the 1X system are mixed in hardware in one wireless base station or base station controller, and operations are performed separately. In other words, the base station transmitter is provided with a channel card for the EV-DO system and a channel card for the 1X system, respectively. In addition, the base station controller also includes a data processing board for processing packet data transmitted and received in the EV-DO system and a data processing board for processing data transmitted and received in the 1X system.

Accordingly, when multimedia data is transmitted from the mobile communication system such as the wireless base station or the base station controller to the mobile communication terminal, the multimedia data is transmitted to the EV-DO system, and the voice or data is transmitted to the 1X system.

In order to receive the multimedia service from the EV-DO system to the mobile communication terminal, the mobile communication terminal transmits a connection request signal for call connection to the EV-DO system, and the EV-DO system transmits to the mobile communication terminal. It transmits a traffic channel assignment (TCA) signal.

The mobile communication terminal should transmit a reverse traffic channel (RTC) signal to the EV-DO system within 1 second in response to the traffic channel assignment signal. At this time, after transmitting the traffic channel signal to the mobile communication terminal, the EV-DO system releases the call connection with the mobile communication terminal if the reverse traffic channel signal is not received from the mobile communication terminal within 1 second. . Therefore, the user has a hassle to operate the mobile communication terminal and repeat the operation of reconnecting to the EV-DO system.

In order to solve the above-described problem, the present invention, when the hybrid terminal to receive the multimedia service attempts to access the call to the EV-DO system, the EV-DO system hybridizes a traffic channel assignment (TCA) signal for call setup After the transmission to the terminal, when the reverse response signal is not received from the hybrid terminal for a certain time, the EV-DO system for setting up the call of the access terminal to send a traffic channel assignment signal once more so that the call setup is made, and a method thereof It aims to provide.

1 is a block diagram schematically illustrating a configuration of an EV-DO system for setting up a call of an access terminal in a multimedia mobile communication system;

2 illustrates a channel structure of a forward link transmitted from an EV-DO transmitter to a hybrid terminal;

3 illustrates a channel structure of a reverse link transmitted from an hybrid terminal to an EV-DO transmitter.

4 is a signal transmission flowchart illustrating a process of establishing a call between an EV-DO system and an access terminal according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: hybrid terminal (HAT) 120: base station transmitter

122: 1X Transmitter (BTS) 124: EV-DO Transmitter (ANTS)

130: base station controller 132: 1X controller (BSC)

134: EV-DO controller (ANC) 140: mobile communication switching center (MSC)

142: HLR 144: VLR

146: PSTN 150: PDSN

160: IP network

To this end, the present invention is an EV-DO system for setting up a call of an access terminal, and supports a 1X system for transmitting or receiving voice or data with the EV-DO system, when requesting a call connection to the EV-DO system, the connection When a request signal is transmitted to the EV-DO system and a traffic channel assignment signal is received from the EV-DO system, a reverse response signal is transmitted to the EV-DO system, and the traffic channel assignment signal is transmitted from the EV-DO system. A hybrid terminal for performing call setup with the EV-DO system by transmitting a traffic channel completion signal upon receiving a recognition signal signal for the mobile station; An EV-DO transmitter for transmitting and receiving packet data with the hybrid terminal; And controlling a transmission service of the packet data of the EV-DO transmitter and, when receiving a call connection request signal from the hybrid terminal through the EV-DO transmitter, transmitting a traffic channel allocation signal to the hybrid terminal, If there is no response signal to the traffic channel assignment signal from the hybrid terminal, characterized in that it comprises an EV-DO controller for controlling to complete the call setup with the hybrid terminal by retransmitting the traffic channel assignment signal repeatedly .

According to another object of the present invention, a method for establishing a call between an EV-DO system and a access terminal in a multimedia mobile communication system, comprising: (a) requesting a call connection to the EV-DO system from a hybrid terminal; (b) transmitting a traffic channel assignment signal from the EV-DO system to the hybrid terminal; (c) the EV-DO system determining whether a response signal for the traffic channel assignment signal is received from the hybrid terminal; (d) retransmitting the traffic channel assignment signal to the hybrid terminal when a response signal for the traffic channel assignment signal is not received from the hybrid terminal to the EV-DO system; And (e) transmitting a response signal in response to the traffic channel assignment signal from the hybrid terminal to the EV-DO system, and transmitting the reverse traffic channel recognition signal to the hybrid terminal, thereby allowing the hybrid terminal to transmit the response signal. And completing a call setup by transmitting a traffic channel termination signal to the EV-DO system.

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.

1 is a block diagram schematically illustrating a configuration of an EV-DO system for setting up a call of an access terminal in a multimedia mobile communication system according to a preferred embodiment of the present invention.

As shown in FIG. 1, the multimedia mobile communication system 100 according to the present invention has a configuration in which an EV-DO system and a 1X system are mixed. That is, a 1X system including a hybrid terminal 110, a 1X transmitter 122, a 1X controller 132, a mobile switching center (MSC) 140, and the like for the transmission of voice and data, data only. Hybrid terminal 110, EV-DO (Access Network Transceiver Subsystem) 124, EV-DO (Access Network Controller) (ANC) 134, packet data serving for transmission An EV-DO system including a Node Data Packet Node (PDSN) (hereinafter referred to as PDSN) 150 and an Internet Protocol (IP) network 160 has a mixed configuration.

The hybrid terminal 110 is provided with a voice service and a low speed data service through the 1X system, and has a hardware-separated configuration so as to receive a high speed data service through the EV-DO system. Hybrid terminal 110 is set to switch to the 1X mode to communicate through the 1X system in the standby state waiting for communication, the EV-DO system to the EV-DO mode at regular intervals to check whether the incoming data It performs the operation of switching to switching mode and returning to 1X mode again.

The switching function between the 1X system and the EV-DO system is handled by software installed in a mobile station modem (MSM) chip, which is a kind of baseband modem embedded in the hybrid terminal 110, and This is accomplished by tracking the frequencies used in each network by a component called a searcher connected to the MSM chip. That is, when the hybrid terminal 110 switches from the EV-DO system to the 1X system, the servo module tracks and switches the frequency used in the 1X system under the control of the MSM chip, and switches from the 1X system to the EV-DO system. The device tracks and switches the frequencies used by the EV-DO system.

When the hybrid terminal 110 receives the multimedia data from the EV-DO system in the EV-DO mode, in the case of a forward link transmitted from the access network (AN) of the EV-DO system to the hybrid terminal 110 Reverse link for transmitting a large amount of messages using a time division multiple access (TDMA) scheme and transmitting from the hybrid terminal 110 to the access network (AN) of the EV-DO system. In the case of using a code division multiple access (CDMA) scheme to accommodate a large number of subscribers.

In addition, while receiving multimedia data from the EV-DO system in the EV-DO mode, the hybrid terminal 110 switches to the 1X mode at regular intervals to check whether there is an incoming voice signal to the 1X system. The operation returns to the EV-DO mode again.

When the hybrid terminal 110 requests a call connection to the EV-DO system to receive a multimedia service, the hybrid terminal 110 transmits a connection request signal to the EV-DO system, and allocates a traffic channel from the EV-DO system. When receiving a (Traffic_Channel_Assignment, hereinafter referred to as "TCA") signal, and transmits a reverse response channel (referred to as "RTC") to the EV-DO system, when receiving the recognition signal (RTC_ACK) signal Call setup is completed by transmitting a traffic channel completion signal (hereinafter, referred to as 'TCC').

The 1X transmitter 122 and the EV-DO transmitter 124 are base station transceiver subsystems (BTSs) 120 and provide a mobile communication service to the hybrid terminal 110 through an air interface. That is, voice or data is provided through the 1X transmitter 122 and only data is provided through the EV-DO transmitter 124.

The 1X controller 132 and the EV-DO controller 134 serve as base station controllers (BSCs) 130 to control mobile communication services of the base station transmitter 120. That is, the 1X controller 132 for controlling the transmission of voice or data connects a plurality of 1X transmitters to the mobile switching center 130, and the EV-DO controller 134 connects the plurality of EV- for controlling only data transmission. The DO transmitter is connected to PDSN 150, which is a packet data network.

In particular, when the EV-DO controller 134 receives a call connection request (Connection_Request) signal from the hybrid terminal 110 through the EV-DO transmitter 124, after transmitting the traffic channel assignment (TCA) signal, the hybrid terminal If there is no response signal from 110, the TCA signal is retransmitted to control call completion.

The mobile switching center 140 physically connects the plurality of 1X controllers 132 with another mobile switching center or a public switched telephone network (PSTN) 146, and a hybrid terminal ( Switch the communication connection path of the 1X system for the communication call from 110).

In addition, the mobile communication switching center 140 includes a home location register (HLR) 132, which is a database that stores information on mobile terminals registered with itself, and mobiles within its service area. The mobile terminal obtains the information of the mobile terminal from the visitor location register (VLR) 134, which is a database that stores information of the terminal, and processes the call of the subscriber.

The EV-DO system, which is a packet data system for transmitting data only, is coupled to the PDSN 150 based on TCP / IP, and transmits and receives various data to and from the IP network 160 through an IP packet (Internet Protocol Packet). . After receiving the packet data transmitted from the IP network 160 to the hybrid terminal 110, the packet data is generated for the packet data service, for example, an MPEG packet, and the generated packet data is divided by the TDM scheme. It is loaded to the time slot and sent to the hybrid terminal 110. In addition, CDMA modulated data received from the hybrid terminal 110 is generated, and an IP packet is generated based on this, and then the corresponding IP packet is transmitted to the PDSN 150.

The EV-DO system should maximize throughput per sector and assign each user the highest data rate possible according to channel conditions. To this end, one sector serves only one user at maximum power at a time. In the forward link in the EV-DO system, the base station transmits at maximum power capable of transmitting a signal without using power control and only hard handoff is possible. In the reverse link, power control is performed for each terminal, and softer or soft handoff is possible.

2A shows a channel structure of a forward link transmitted from the EV-DO transmitter 124 to the hybrid terminal 110.

As shown in FIG. 2A, the forward link includes a pilot channel, a medium access control (MAC) channel, a control channel, and a traffic channel. The pilot channel is a channel through which the EV-DO system transmits a pilot signal for tracking the hybrid terminal 110. The hybrid terminal 110 receives one or more pilot signals transmitted through the pilot channel, and among the received pilot signals. It connects to the wireless base station which transmitted the pilot signal having the greatest intensity. In addition, the pilot channel is also used by the hybrid terminal 110 for reference for coherent detection of the radio base station of the EV-DO system.

The MAC channel is mainly used for controlling the reverse link, and is composed of a reverse activity (RA) channel and a reverse power control (RPC) channel. Here, the RA channel is used to determine the transmission speed of the reverse link, and is also used to request the hybrid terminal 110 to lower the transmission speed when the channels of the reverse link become saturated. In addition, the RPC channel is a channel used by the hybrid terminal 110 to control transmission power in case of signal or data transmission on the reverse link.

The control channel is a channel used to transmit a broadcast message or a direct message for directly controlling a specific hybrid terminal 110 to the hybrid terminal 110 in the EV-DO system. In the EV-DO system, the channel is used to transmit only pure packet data to the hybrid terminal 110.

The traffic channel is a channel used to transmit packet data to the hybrid terminal 110 in the EV-DO system and supports various data transmission rates according to a wireless environment.

Meanwhile, referring to FIG. 2B, the structure and data structure of the time slot of the forward link will be described. The forward link includes 16 time slots per frame, and one frame has a time of approximately 26.67 ms. With intervals. One timeslot consists of 2048 chips, first half slot 1024 chips and second half slot 1024 chips, with 1.67 ㎳ per time slot. With intervals.

Each of the first half slots and the second half slots contains data slots 400 chips, MAC slot 64 chips, pilot slot 96 chips, MAC slot 64 chips, and data slot 400 chips. It is composed of

3 illustrates a channel structure of a reverse link transmitted from the hybrid terminal 110 to the EV-DO transmitter 124.

The reverse link shown in FIG. 3 uses a code division multiple access scheme as in the 1X system, and is largely composed of an access channel and a traffic channel. The access channel consists of a pilot channel and a data channel, and the traffic channel consists of a pilot channel, a MAC channel, an acknowledgment channel, and a data channel. Here, the MAC channel is composed of a Reverse Rate Indicator (RRI) channel and a Data Rate Control (DRC) channel.

The access channel is a channel used to transmit an Origination Signal (Connection_Request Message) and a Registration Signal (Route_Update Message), and has a low transmission rate of 9.6 kbps for the stability of the wireless channel.

The pilot channel is used for the hybrid terminal 110 for reference for coherent detection of the radio base station of the EV-DO system, similar to the pilot channel in the forward link described with reference to FIG. 2A. The data channel is a channel used to transmit data necessary for the hybrid terminal 110 to access the EV-DO system.

The traffic channel is a channel used by the hybrid terminal 110 to transmit packet data to the EV-DO system and supports various data transmission rates according to a wireless environment.

The pilot channel performs the same function as the pilot channel described in the access channel. The MAC channel is a channel used to control the data rate of the traffic channel and continues to be formed while the hybrid terminal 110 maintains a connection with the EV-DO system. In the MAC channel, the RRI channel is a channel used to inform the information of the data rate of the traffic channel transmitted by the hybrid terminal 110, and the value of the RRI is displayed on the hybrid terminal 110.

In addition, the DRC channel determines the demodulated data rate according to the channel environment of the current forward link and informs the base station. That is, the EV-DO transmitter 124 transmits the packet data to the hybrid terminal 110 using the time slot of the forward channel. The criterion for determining the transmission rate of the packet data is the DRC Cover value transmitted by the hybrid terminal 110. to be. In order to determine the DRC Cover value, the hybrid terminal 110 measures a Carrier to Interference (C / I) value received from the EV-DO transmitter 124 to determine a DCR Cover value capable of achieving a maximum transmission rate.

The response channel is a channel used by the hybrid terminal 110 to transmit a response signal for data received in a time slot unit in a forward direction. In order to reduce the length of the data and to reduce interference, 1 of the basic timeslot path is used. Occupies only two.

The data channel is a channel used by the hybrid terminal 110 to transmit only packet data, similar to the data channel of the access channel.

Meanwhile, a packet, which is a basic transmission unit of a traffic channel, has a length of 26.66 ms and is transmitted by changing the transmission bit rate for each packet size. The pilot channel, traffic channel, DRC channel, and response channel used in the reverse link are distinguished by using an orthogonal Walsh code.

4 is a signal transmission flowchart illustrating a process of establishing a call between an EV-DO system and an access terminal according to an exemplary embodiment of the present invention.

When the power is turned on by the user, the hybrid terminal 110 receives a pilot signal from the 1X controller 132 and the 1X transmitter 122 of the 1X system to initialize the 1X mode (Initialization) to maintain a standby state, and the 1X mode. After initializing the EV-DO mode using the system parameter message obtained at the initialization and a pilot signal from the EV-DO controller 134 and the EV-DO transmitter 132, the standby state is maintained.

The hybrid terminal 110 that initializes the 1X mode and the EV-DO mode performs dual monitoring between the 1X mode and the EV-DO mode, and monitors at a cycle of 5.12 seconds in the 1X mode.

Meanwhile, the hybrid terminal 110 transmits data from the EV-DO transmitter 124 to the hybrid terminal 110 while monitoring the 1X system and the EV-DO system in a standby state, or a user of the hybrid terminal 110 receives a key. When the data request is made to the EV-DO system by operation, it is determined whether the system enters the traffic state for transmitting and receiving data in the EV-DO mode. In order to enter the traffic state, the hybrid terminal 110 needs to establish a connection and session with the EV-DO transmitter 124 so as to transmit and receive data with the EV-DO transmitter 124.

In operation S410, the hybrid terminal 110 transmits a connection request (Connection_Request) message for call connection to the EV-DO transmitter 124 by a user's key input operation.

The EV-DO transmitter 124 receiving the connection request signal from the hybrid terminal 110 transmits a response signal (L2Ack: Layer2 Acknowledge) indicating that the connection request signal has been received to the hybrid terminal 110 and is currently located. A traffic channel assignment (TCA) signal including a sequence number of a base station and an adjacent base station is transmitted (S420).

After the EV-DO transmitter 124 transmits the TCA signal to the hybrid terminal 110, the hybrid terminal 110 does not receive the TCA signal or receives the TCA signal due to a location in a shaded area or radio interference. Even if the response signal may not be transmitted to the EV-DO transmitter 124 may occur.

After the EV-DO transmitter 124 transmits the TCA signal to the hybrid terminal 110, when a response signal (RTC) for the TCA signal is not received from the hybrid terminal 110 for one second (S430). The mobile station fails to acquire a channel for the hybrid terminal 110 (Mobile Acquisition Fail), and thus transmits the TCA signal for channel allocation once more to the hybrid terminal 110 (S440).

The EV-DO transmitter 124 may repeat the operation of transmitting the TCA signal up to three times if there is no signal from the hybrid terminal 110 even after retransmitting the TCA signal to the hybrid terminal 110.

That is, the EV-DO transmitter 124 transmits the TCA signal from the time when the connection request signal is received from the hybrid terminal 110, receives a response signal (RTC) thereto, and then transmits the RTC_ACK signal to the hybrid terminal 110. It takes 2.5 seconds to transmit. Therefore, if there is no response signal (RTC) after transmitting the TCA signal from the EV-DO transmitter 124 to the hybrid terminal 110, the TCA signal is repeated three times within the range not exceeding 2.5 seconds. Or more can be resent.

Subsequently, the hybrid terminal 110 receives a traffic channel from the EV-DO transmitter 124 and enters a channel acquisition state capable of transmitting and receiving a wireless signal (Mobile Acquisition Success).

When the hybrid terminal 110 receives the TCA signal from the EV-DO transmitter 124, the hybrid terminal 110 transmits a reverse traffic channel (RTC) signal to the EV-DO transmitter 124 as a response signal (S450).

When the EV-DO transmitter 124 transmits a TCA signal to the hybrid terminal 110 and receives a response signal (RTC) from the hybrid terminal 110, the EV-DO transmitter 124 indicates that the reverse traffic channel is acquired. The traffic channel recognition (RTC_ACK) signal is transmitted to the hybrid terminal 110 (S460).

When the hybrid terminal 110 receives the RTC_ACK signal from the EV-DO transmitter 124, the hybrid terminal 110 transmits a traffic channel completion (TCC) signal to the EV-DO transmitter 124 indicating that the traffic channel setup is completed (S470). .

When the EV-DO system receives the TCC signal from the hybrid terminal 110 through the above-described process and sets up a call between the hybrid terminal 110 and the EV-DO transmitter 124, the EV-DO transmitter 124 is a hybrid. The neighbor base station list (Neighbor_List) is transmitted to the terminal 110 (S480).

According to an embodiment of the present invention, when a hybrid terminal desiring to receive a multimedia service attempts to connect to an EV-DO system, the EV-DO system transmits a traffic channel assignment (TCA) signal for call setup to the hybrid terminal. Then, the EV-DO system and method for setting up the call of the access terminal to send a traffic channel assignment signal once more when the reverse response signal is not received from the hybrid terminal for a certain time, for example, 1 second and call setup Can be realized.

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 scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

As described above, the call connection is resolved when the hybrid terminal attempts to connect to the EV-DO system by retrying the call connection with the hybrid terminal by repeating the traffic channel assignment signal. It can provide services that can increase the success rate.

In addition, whenever the call connection is released, the user can solve the trouble of repeating the operation of reconnecting to the EV-DO system by operating the hybrid terminal.

Claims (14)

An EV-DO system for setting a call of a connection terminal, Supports 1X system for voice or data transmission and reception with the EV-DO system, and transmits a connection request signal to the EV-DO system when requesting a call connection to the EV-DO system, and traffic from the EV-DO system. When receiving a channel assignment signal, a reverse response signal is transmitted to the EV-DO system, and when receiving a recognition signal for the traffic channel assignment signal from the EV-DO system, the EV-DO system is transmitted by transmitting a traffic channel completion signal. A hybrid access terminal (HAT) for performing call setup; An EV-DO transmitter for transmitting and receiving packet data with the hybrid terminal; And After controlling the transmission service of the packet data of the EV-DO transmitter and receiving a call connection request signal from the hybrid terminal through the EV-DO transmitter, after transmitting a traffic channel assignment signal to the hybrid terminal, the hybrid If there is no response signal to the traffic channel assignment signal from the terminal, EV-DO controller (ANC: Access Network Controller) for controlling the call setup can be completed by repeating the retransmission of the traffic channel assignment signal EV-DO system for setting up a call of the access terminal comprising a. The method of claim 1, A 1X transmitter (BTS) for transmitting and receiving voice or data with the hybrid terminal; A 1X controller (BSC) for controlling a transmission service of the 1X transmitter; A mobile communication switching center (MSC) for switching and providing a communication connection path to the 1X system for a communication call from the hybrid terminal; And A packet data serving node (PDSN) connected to the EV-DO controller for transmitting and receiving the packet data with the EV-DO system; EV-DO system for setting up a call of the access terminal further comprises. The method of claim 1, After transmitting the traffic channel allocation signal to the hybrid terminal, the EV-DO system repeats the traffic channel allocation signal when it does not receive a response signal to the traffic channel allocation signal from the hybrid terminal for a predetermined time. EV-DO system for setting up the call of the access terminal characterized in that the transmission to the hybrid terminal. The method of claim 3, wherein The predetermined time is 1 second EV-DO system for setting up a call of the access terminal. The method of claim 1, It takes a certain time from the time when the EV-DO system receives the connection request signal from the hybrid terminal to the recognition signal for the traffic channel assignment signal to the hybrid terminal, After the EV-DO system transmits the traffic channel allocation signal to the hybrid terminal, if there is no response signal to the traffic channel allocation signal, the EV-DO system is within the range not exceeding the predetermined time. And re-transmitting the traffic channel assignment signal to the hybrid terminal until a response signal to the traffic channel assignment signal is received. The method of claim 5, wherein The predetermined time is 2.5 seconds EV-DO system for setting up a call of the access terminal. The method of claim 1, When a forward link is transmitted from the EV-DO system to the hybrid terminal, a large amount of messages are transmitted through a time division multiple access (TDMA) scheme. In the reverse link transmitted from the hybrid terminal to the EV-DO system, a code division multiple access (CDMA) scheme is used to accommodate a plurality of subscribers. EV-DO system to set up. A method of setting up a call of an access terminal in an EV-DO system of a multimedia mobile communication system, (a) a hybrid terminal requesting a call connection to the EV-DO system; (b) transmitting a traffic channel assignment signal from the EV-DO system to the hybrid terminal; (c) the EV-DO system determining whether a response signal for the traffic channel assignment signal is received from the hybrid terminal; (d) retransmitting the traffic channel assignment signal to the hybrid terminal when a response signal for the traffic channel assignment signal is not received from the hybrid terminal to the EV-DO system; And (e) transmitting a response signal in response to the traffic channel assignment signal from the hybrid terminal to the EV-DO system, and transmitting the reverse traffic channel recognition signal to the hybrid terminal by the EV-DO system, so that the hybrid terminal receives the response signal. Completing call setup by sending a traffic channel termination signal to the EV-DO system Method of setting a call of the access terminal in the EV-DO system comprising a. The method of claim 8, In case of a forward link transmitted from the EV-DO system to the hybrid terminal, a message is transmitted in a time division multiple access (TDMA) scheme. In the reverse link transmitted from the hybrid terminal to the EV-DO system, a message is transmitted in a code division multiple access (CDMA) scheme. How to set up an arc. The method of claim 8, wherein step (d) After the EV-DO system transmits the traffic channel allocation signal to the hybrid terminal, if the response signal for the traffic channel allocation signal is not received from the hybrid terminal for a predetermined time, the traffic channel allocation signal is repeated. And calling the access terminal in the EV-DO system, wherein the call is sent to the hybrid terminal. The method of claim 10, The predetermined time is 1 second method for establishing a call of the access terminal in the EV-DO system. The method of claim 8, wherein in step (d) It takes a certain time from the time when the EV-DO system receives the connection request signal from the hybrid terminal to the recognition signal for the traffic channel assignment signal to the hybrid terminal, After the EV-DO system transmits the traffic channel allocation signal to the hybrid terminal, if there is no response signal to the traffic channel allocation signal, the EV-DO system is within the range not exceeding the predetermined time. And retransmitting the traffic channel allocation signal to the hybrid terminal repeatedly until a response signal to the traffic channel allocation signal is received. The method of claim 12, The predetermined time is 2.5 seconds method for establishing a call of the access terminal in the EV-DO system. The method of claim 8, After the step (e) of establishing a call between the hybrid terminal and the EV-DO system, the EV-DO system transmits a neighbor base station list to the hybrid terminal. When the hybrid terminal receives the multimedia data from the EV-DO system, switching to the 1X mode at regular intervals to check whether there is an incoming voice signal from the 1X system, and then returning to the EV-DO mode again. Method of setting up a call of the access terminal in the EV-DO system, characterized in that for performing.