KR100423375B1 - Method and System for Switching over to 1X System upon 1xEV-DO System Failure - Google Patents

Abstract

PURPOSE: A method and system for transfer call connection to a 1x system in occurrence of a failure of 1xEV-DO system are provided to avoid re-attempting of a call connection for receiving a multimedia service by transferring a call connection to a 1x system when 1xEV-DO system has an error. CONSTITUTION: A HAT(Hybrid Access Terminal) initializes 1x mode and 1xEV-DO mode(S410). The HAT performs a dual monitoring on the 1x mode and the 1x EV-DO modes(S420). When a user desires to receive multimedia data from a 1xEV-DO system to the HAT, the HAT is set in 1xEV-DO mode and the 1xEV-DO mode becomes active(S430). The HAT transmits a connection request message to a 1xEV-DO transmitter to request a call connection(S440). When the HAT receives a connection deny message from a 1x-EV-DO controller(S450), it stops operation in the 1xEV-DO mode and automatically switches to 1x mode(S460). The HAT performs a call connection to the 1x system with 1x mode in an active state and transmits to and received from the 1x system(S470).

Description

Method and System for Switching over to 1X System upon 1xEV-DO System Failure}

The present invention relates to a method and system for switching a call connection to a 1X system in the event of a failure of the 1xEV-DO system. More specifically, when the CDMA 2000 1x EV-DO system fails when the HAT requests a call connection to the CDMA 2000 1x EV-DO system, the call connection is performed by switching the call connection to the CDMA 2000 1x system. The present invention relates to a method and a system for switching a call connection to a 1X system when a 1xEV-DO system fails.

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.

The IMT-2000 service may be classified into a code division multiple access (CDMA) 2000 1X service and a CDMA 2000 1x EV-DO service.

The CDMA2000 1X service uses the IS-95C network, which has evolved from the existing IS-95A and IS-95B networks. Internet is a service available. Therefore, the CDMA 2000 1X service enables the improvement of existing voice and WAP (Wireless Application Protocol) service quality as well as the provision of various multimedia services (AOD, VOD, etc.).

Meanwhile, the IMT-2000 system for the multimedia mobile communication service has defined the standard of the synchronous IMT-2000 system in 3GPP (3rd Generation Partnership Projects) 2, which is an international standardization organization. The method based on the company's high data rate (HDR) was named "CDMA 2000 1x EV-DO (Evolution Data Optimized)" and was confirmed as an international standard. CDMA 2000 1x EV-D0 (hereinafter referred to as '1xEV-DO') is a method of evolving from CDMA 2000 1X that specifies that only data is transmitted in the communication standard of CDMA 2000 1X (hereinafter referred to as '1X'). .

1X provides a unidirectional high speed data service with a transmission rate of up to 307.2 Kbps in the form of a mixture of a circuit network and a packet network. On the other hand, 1xEV-D0 provides a bidirectional high speed data service having a transmission rate of up to 2.4 Mbps for packet networks only.

Hereinafter, for convenience of description, the CDMA 2000 1X system will be abbreviated as "1X system" and the CDMA 2000 1x EV-DO system "as" 1xEV-DO system ".

Currently, the 1xEV-DO system is used interchangeably with the existing 1X system. That is, the 1xEV-DO system and the 1X system are simultaneously installed in one wireless base station or base station controller, but operations are performed separately. In other words, the base station transmitter is provided with a channel card for the 1xEV-DO system and a channel card for the 1x system, respectively. The base station controller also includes a data processing board for processing packet data transmitted and received with the 1xEV-DO system and a data processing board for processing data transmitted and received with the 1x system.

When multimedia data is transmitted from a mobile communication system such as a wireless base station or a base station controller to a mobile terminal, the multimedia data is transmitted to the 1xEV-DO system, and the voice or data is transmitted to the 1x system.

On the other hand, when the user wants to receive multimedia data from the 1xEV-DO system to the mobile terminal, the call connection is performed to the 1xEV-DO system. In this case, the 1xEV-DO system allocates a frequency signal to a plurality of channels, such as a pilot channel, a traffic channel, and an access channel, for the mobile terminal requesting a call connection. However, when an error occurs due to an internal problem in the 1xEV-DO system, it is impossible to allocate a frequency signal to a mobile terminal that has requested a call connection.

Therefore, the mobile terminal that requested the call connection fails to connect the call to the 1xEV-DO system, and displays the call connection failure. In order to receive multimedia data, the user has to troubleshoot the call connection from the beginning to the 1xEV-DO system. Even if the user attempts to reconnect, the user cannot but fail again unless the 1xEV-DO system is restored.

In order to solve the above problems, the present invention provides a CDMA 2000 1x EV-DO system when a call connection is requested from a hybrid terminal (HAT) to a CDMA 2000 1x EV-DO system. It is an object of the present invention to provide a method and system for switching a call connection to a 1X system when a 1xEV-DO system that performs a call connection by switching.

1 is a system configuration diagram illustrating a call connection switching to a 1X system when a 1xEV-DO system fails according to an embodiment of the present invention;

2A is a diagram illustrating a channel structure of a forward link transmitted from a 1xEV-DO transmitter to a hybrid terminal;

2b is a view showing a structure and a data structure of a timeslot of a forward link transmitted from a 1xEV-DO transmitter to a hybrid terminal;

3 illustrates a channel structure of a reverse link transmitted from a hybrid terminal to a 1xEV-DO transmitter.

4 is a flowchart illustrating a method of switching a call connection to a 1X system when a 1xEV-DO system fails.

<Description of Symbols for Main Parts of Drawings>

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

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

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

134: 1xEV-DO controller (ANC) 140: mobile communication switching center (MSC)

142: HLR 144: VLR

146: PSTN 150: PDSN

160: IP network

In order to achieve the above object, the present invention provides a call connection to a CDMA 2000 1X system (hereinafter referred to as a '1X system') when a CDMA 2000 1x EV-DO system (hereinafter referred to as a '1xEV-DO system') occurs. In the hybrid mobile communication system to switch, 1x mode for receiving a voice signal transmission service or a low-speed data transmission service in conjunction with the 1X system, or 1xEV- for receiving a high speed data transmission service in conjunction with the 1xEV-DO system. When operating in the DO mode and attempting to connect to the 1xEV-DO system to receive the high-speed data transmission service, if a connection deny message is received from the 1xEV-DO system, the device switches to the 1X mode to the 1X system. A hybrid terminal receiving a data transmission service by executing a call connection; A 1xEV-DO transmitter that provides the high speed data transmission service at high speed to the hybrid terminal through an air interface; A 1X transmitter providing the voice signal transmission service or the low speed data transmission service to the hybrid terminal; A 1xEV-DO controller for controlling the high speed data transmission service of the 1xEV-DO transmitter; A 1X controller for controlling the voice signal transmission service or the low speed data transmission service of the 1X transmitter; A mobile communication switching center for switching a communication connection path to the 1X system for providing a communication call from the hybrid terminal; And a packet data node transmitting and receiving high speed data to and from the 1xEV-DO system in the form of an IP packet.

According to another object of the present invention, a method for switching a call connection to a 1X system in the event of a 1xEV-DO system failure, comprising: (a) 1x mode for communicating with the 1X system and 1xEV for communicating with the 1xEV-DO system; Initializing the DO mode to wait for communication; (b) performing dual monitoring on the 1X mode and the 1xEV-DO mode; (c) activating the 1xEV-DO mode to transmit and receive multimedia data; (d) requesting a call connection by transmitting a connection request message to the 1xEV-DO system; (e) determining whether a connection deny message has been received from the 1xEV-DO system; (f) stopping the operation of the 1xEV-DO mode and switching to the 1X mode to make the 1X mode active when the connection die message is received; And (g) transmitting and receiving data by executing a call connection to the 1X system, when the 1xEV-DO system fails.

In addition, according to another object of the present invention, when a failure of the CDMA 2000 1x EV-DO system (hereinafter referred to as "1xEV-DO system") occurs, the call connection to the CDMA 2000 1X system (hereinafter referred to as "1X system") A hybrid terminal for switching, 1X mode for interworking with the 1X system to provide a voice signal transmission service or a low speed data transmission service, or 1xEV-DO mode for interfacing with the 1xEV-DO system to provide a high speed data transmission service. When a connection connection message is received from the 1xEV-DO system when attempting to connect to the 1xEV-DO system to provide the high-speed data transmission service, the device switches to the 1X mode and establishes a call connection to the 1X system. Provided is a hybrid terminal characterized in that the data transmission service is provided.

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 schematically illustrates a configuration of a hybrid mobile communication system for switching call connection between a 1xEV-DO system and a 1X system according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the hybrid mobile communication system 100 according to the present invention has a configuration in which a 1xEV-DO system and a 1X system are mixed. That is, a configuration for transmission of voice signals or low-speed data, the hybrid terminal (HAT: Hybrid Access Terminal, 110), 1X transmitter 122, 1X controller 132 and Mobile Switching Center (MSC) (140) A hybrid terminal 110, an Access Network Transceiver Subsystem (ANTS) 124, and a 1xEV-DO (Access Network). Access Network Controller (ANC) 134, Packet Data Serving Node (PDSN) (hereinafter referred to as PDSN) 150, and IP (Internet Protocol) network 160. .

The hybrid terminal 110 is a mobile communication terminal that can accommodate both communication services provided by the 1xEV-DO system and the 1X system. The hybrid terminal 110 alternately monitors two systems at regular time intervals. That is, in the operating state of the 1X system that does not use the 1xEV-DO system, the hybrid terminal 110 periodically searches for the 1xEV-DO system in the middle of communicating with the 1X system, and in the traffic using the 1xEV-DO system, the 1xEV-DO system. Periodically scan the 1X system in the middle of communicating with the DO system.

For example, in a traffic state with a 1xEV-DO system, the hybrid terminal 110 responds to a call signal such as a voice call connection signal or a short message that may be transmitted from the 1X system, and periodically registers its location with the 1X system. It connects to 1X system and updates system resource such as system message, access message. Accordingly, the hybrid terminal 110 receives a voice signal transmission service and a low speed data transmission service through the 1X system, and accommodates both systems to receive a high speed data service through the 1xEV-DO system. In order to have a hardware configuration corresponding to each of the two systems, but the two components operate independently of each other. Hybrid terminal 110 having such a complex function and configuration is generally set to switch to the 1X mode to communicate through the 1X system in the standby state waiting for communication, in order to check whether the data received by the 1xEV-DO system Switching to 1xEV-DO mode at regular intervals and then returning to 1x mode is performed.

The switch function between the 1X system and the 1xEV-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 both systems by a component called a searcher connected to the MSM chip. That is, when the hybrid terminal 110 switches from the 1xEV-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 1xEV-DO system. Track and use the frequency used by the 1xEV-DO system.

In the 1xEV-DO mode, a time division multiple access (TDMA) in a forward link for transmitting multimedia data from the 1xEV-DO system to the hybrid terminal 110 via an access network (AN). A large number of subscribers can be transmitted by using a large number of subscribers, and a reverse link transmitting data from the hybrid terminal 110 to the 1xEV-DO system via an access network (AN). To accommodate the code division multiple access (CDMA) scheme is used.

In addition, while receiving data from the 1xEV-DO system in the 1xEV-DO mode, the hybrid terminal 110 switches to the 1X mode at regular intervals and checks whether there is an incoming voice signal in the 1X mode. Performs the return to the 1xEV-DO mode.

In the 1xEV-DO mode, when the hybrid terminal 110 attempts to connect to the 1xEV-DO transmitter 124 to receive multimedia data from the 1xEV-DO system, the 1xEV-DO transmitter 124 or 1xEV-DO is performed. When the controller 134 fails and receives a Connection Deny message from the 1xEV-DO transmitter 124, the 1xEV-DO system is recognized as a failure state and the 1xEV-DO mode is switched from the 1xEV-DO mode state to the 1X mode. The call connection is executed to receive multimedia data from the 1X system.

The 1X transmitter 122 and the 1xEV-DO transmitter 124 are base station transceiver subsystems (BTSs) 120 that transmit voice signals or multimedia data to the hybrid terminal 110 through an air interface. To provide a mobile communication service. For example, the 1X transmitter 122 provides voice or low speed data to the hybrid terminal 11, and the 1xEV-DO transmitter 124 provides mainly high speed data to the hybrid terminal 110.

The 1X controller 132 and the 1xEV-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 connects a plurality of 1X transmitters to the mobile switching center 130 to control transmission of voice or data, and the 1xEV-DO controller 134 connects a plurality of 1xEV-DO to control transmission of data. The transmitter is connected to PDSN 150, which is a packet data network.

In particular, when there is a call connection request for multimedia data transmission from the hybrid terminal 110, the 1xEV-DO controller 134 fails in the 1xEV-DO transmitter 124 or the 1xEV-DO controller 134. If the call connection cannot be established with the 110, the connection terminal message is transmitted to the hybrid terminal 110 so that the hybrid terminal 110 stops the call connection to the 1xEV-DO system and connects to the 1X system. To do this.

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

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 1xEV-DO system as a packet data system for transmitting only data is coupled to the PDSN 150 based on TCP / IP, and transmits and receives various data with the IP network 160 in the form of 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 into TDM schemes. 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 1xEV-DO system is required to maximize throughput per sector and assign each user the highest data rate possible depending on the channel situation. Accordingly, the 1xEV-DO system provides a multimedia service with maximum power when transmitting multimedia data to one hybrid terminal 110 in one sector.

In the forward link in the 1xEV-DO system, the base station transmits the maximum power capable of transmitting multimedia data without power control, and enables hard handoff. In the reverse link, power control is performed for each hybrid terminal, and softer or soft handoff is possible.

2A illustrates the channel structure of the forward link transmitted from the 1xEV-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 1xEV-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 largest signal strength. In addition, the pilot channel is also used for reference when the hybrid terminal 110 performs coherent detection of the radio base station of the 1xEV-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 to a hybrid terminal 110 in a 1xEV-DO system or a direct message for directly controlling a specific hybrid terminal. It is a channel used to transmit only pure packet data to the hybrid terminal 110 in the 1xEV-DO system.

On the other hand, referring to Figure 2b, the structure of the time slot and data structure of the forward link, the forward link is composed of 16 time slots per frame (frame), one frame is approximately 26.67 ms Have a time interval. 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 1xEV-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 used to transmit an Origination Signal (Connection_Request Message) and a Registration Signal (Route_Update Message). The access channel has a low transmission rate of 9.6 kbps for the stability of the wireless channel.

The pilot channel is used for reference when the hybrid terminal 110 performs coherent detection of the radio base station of the 1xEV-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 1xEV-DO system.

The traffic channel is a channel used by the hybrid terminal 110 to transmit packet data to the 1xEV-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 1xEV-DO system. In the MAC channel, the RRI channel is 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 1xEV-DO transmitter 124 transmits packet data to the hybrid terminal 110 by 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 1xEV-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. The response channel is small in length and has a length of 1 / time of the basic timeslot length in order to reduce interference. Occupies 2 million.

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.

Next, an operation of performing a call connection by switching to a 1X system in the event of a 1xEV-DO system failure according to an embodiment of the present invention will be described based on the system configuration described above and the flowchart shown in FIG. 4.

4 is a flowchart illustrating a method of switching a call connection to a 1X system when a 1xEV-DO system fails.

First, 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, After initializing the 1xEV-DO mode using the system parameter message acquired at the time of initializing the 1x mode and the pilot signal from the 1xEV-DO controller 134 and the 1xEV-DO transmitter 132, the standby state is maintained (S410).

In the standby state, the hybrid terminal 110 basically sets the operation of the terminal to 1X mode to wait for communication.

The hybrid terminal 110, which has initialized the 1X mode and the 1xEV-DO mode, performs dual monitoring between the 1X mode and the 1xEV-DO mode in a state where the 1X mode is set to the 1X mode. The 1xEV-DO mode is performed at 5.12 seconds in the 1X mode. It will be monitored (S420).

Here, the dual monitoring means that the hybrid terminal 110 basically monitors whether there is an incoming call or transmission of data from the 1X transmitter 124 in the 1X mode, and the hybrid terminal 111 after 5.12 seconds. It is to switch to the 1xEV-DO mode by the operation mode of 1) to monitor whether there is data transmission from the 1xEV-DO transmitter 124, and then return to the 1X mode.

On the other hand, when the user wants to receive multimedia data from the 1xEV-DO system to the hybrid terminal 110, the hybrid terminal 110 is operated to set the hybrid terminal 110 to the 1xEV-DO mode. 110 activates the 1xEV-DO mode to receive data in the 1xEV-DO mode. In addition, when the multimedia data is unilaterally transmitted from the 1xEV-DO transmitter 124 to the hybrid terminal 110, the hybrid terminal 110 needs to receive data in a state of being switched from the 1x mode to the 1xEV-DO mode. The 1xEV-DO mode is set to an active state for receiving data (S430).

When the 1xEV-DO mode of the hybrid terminal 110 becomes active, the hybrid terminal 110 may connect with the 1xEV-DO transmitter 124 and the connection (Connection) to transmit and receive multimedia data from the 1xEV-DO transmitter 124. Session must be established. Accordingly, the hybrid terminal 110 requests a call connection by transmitting a connection request message for forming a connection to the 1xEV-DO transmitter 124 in order to receive data from the 1xEV-DO transmitter 124 (S440).

Here, the connection refers to a logical communication path, and in communication, a communication path established between a terminal and a system for information transmission, and sessions communicate with each other through message exchanges to perform communication between the terminal and the system. It means the period from after recognizing the data to the completion of communication.

Meanwhile, the 1xEV-DO controller 134 receives the connection request message from the hybrid terminal 110 via the 1xEV-DO transmitter 124, that is, if there is a call connection request, all resources of the base station transmitter and all of the base station controller are received. Check if the resource, all resources of the PDSN, has failed. When it is determined that a system failure has occurred in the 1xEV-DO transmitter 124 or the 1xEV-DO controller 134, the 1xEV-DO controller 134 transmits a connection deny message to the hybrid terminal 110. In this case, the system failure is to allocate a frequency signal for setting a plurality of channels including a pilot channel to the hybrid terminal 110 requesting a call connection from the base station can not be assigned more than a predetermined time, or the system such as signal strength It means the state that error occurs in parameter.

When the hybrid terminal 110 receives the connection deny message from the 1xEV-DO controller 134 via the 1xEV-DO transmitter 124 (S450), the hybrid terminal 110 stops the operation of the active 1xEV-DO mode and automatically switches to the 1X mode. By switching to activate the 1X mode to the active state (S460).

Subsequently, the hybrid terminal 110 performs a call connection to the 1X system with the 1X mode active, and after the call connection is established, the hybrid terminal 110 includes a base station transmitter 122, a base station controller 132, and a mobile communication switching center 140. Data is transmitted and received to the 1X system (S470).

On the other hand, in step S450 of determining whether a connection deny message has been received from the 1xEV-DO controller 134 via the 1xEV-DO transmitter 124, the 1xEV-DO system operates normally and the connection response is received from the 1xEV-DO transmitter 124. Upon receiving the message, the hybrid terminal 110 forms a connection and session with the 1xEV-DO transmitter 124 to complete a call connection and transmits and receives data (S480).

That is, after establishing a connection between the 1xEV-DO transmitter 124 and the hybrid terminal 110, a session is established, and the hybrid terminal 110 passes through the 1xEV-DO transmitter 124. 134) to establish a session by requesting a unicast access terminal identifier (UATI) and assigning the UATI to the hybrid terminal 110 from the 1xEV-DO controller 134. Here, UATI means a number assigned to the hybrid terminal 110 in the access network as the ID of the terminal, and if a session is established between the hybrid terminal 110 and the 1xEV-DO transmitter 124, the setup of the 1xEV-DO data call, Parameters to be used for power control and handoff are set.

After a session is created between the hybrid terminal 110 and the 1xEV-DO system, the 1xEV-DO controller 134 transmits packet data transmitted from the IP network 160 through the PDSN 150 to the 1xEV-DO transmitter 120. It is provided wirelessly to the hybrid terminal 110 via).

According to an embodiment of the present invention, if a failure occurs in the 1xEV-DO system when requesting a call connection from the hybrid terminal (HAT) to the 1xEV-DO system, a method and system for performing a call connection by switching the call connection to the 1X system It 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 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.

According to the present invention, when performing a call connection from a mobile terminal to a CDMA 2000 1x EV-DO system in order to provide a multimedia service, even if a failure occurs in the 1xEV-DO system, the call connection is performed by switching the call connection to the CDMA 2000 1X system. Can be retried multiple times and provide immediate service to the user.

In addition, the user can seamlessly receive the multimedia data service through the CDMA 2000 1X system while the failed CDMA 2000 1x EV-DO system is being recovered.

Claims (25)

Hybrid mobile communication system that switches the call connection to CDMA 2000 1X system (hereinafter referred to as '1X system') in case of failure of CDMA 2000 1x EV-DO (Evolution Data Optimized) system (hereinafter referred to as '1xEV-DO system') To Operating in a 1X mode for receiving a voice signal transmission service or a low speed data transmission service in conjunction with the 1X system, or in a 1xEV-DO mode for receiving a high speed data transmission service in connection with the 1xEV-DO system, When attempting to connect to the 1xEV-DO system to receive a transmission service, if a Connection Deny message is received from the 1xEV-DO system, the device switches to the 1X mode and executes a call connection to the 1X system. A hybrid access terminal (HAT) provided with a data transmission service; An 1xEV-DO transmitter (ANTS: Access Network Transceiver Subsystem) for providing the high speed data transmission service to the hybrid terminal at high speed through an air interface; A base station transceiver system (BTS) for providing the voice signal transmission service or the low speed data transmission service to the hybrid terminal; An 1xEV-DO controller (ANC) for controlling the high speed data transfer service of the 1xEV-DO transmitter; A 1X controller (BSC) for controlling the voice signal transmission service or the low speed data 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 Packet data service node (PDSN) for transmitting and receiving high-speed data to and from the 1xEV-DO system in the form of an IP (Internet Protocol) packet Hybrid mobile communication system comprising a. The method of claim 1, The hybrid terminal is set to the 1X mode to communicate with the 1X system in an idle state, and the 1xEV-DO mode at regular time intervals to check whether data is received from the 1xEV-DO system. And switching back to the 1X mode again. The method of claim 1, When the hybrid terminal is receiving high-speed data from the 1xEV-DO system in the 1xEV-DO mode, the hybrid terminal switches to the 1X mode at regular intervals to check whether there is an incoming voice signal from the 1X system. And repeating the operation of returning to the 1xEV-DO mode. The method of claim 1, In the forward link for transmitting data from the 1xEV-DO system to the hybrid terminal, a time division multiple access (TDMA) scheme is used. In the reverse link for transmitting data from the hybrid terminal to the 1xEV-DO system, a code division multiple access (CDMA) scheme is used. Hybrid mobile communication system, characterized in that. The method of claim 4, wherein In the forward link that transmits data from the 1xEV-DO system to the hybrid terminal, power is transmitted at maximum power without power control, and a hard handoff is performed. In the reverse link, the hybrid mobile communication system characterized by performing power control for each hybrid terminal and performing a soft handoff. The method of claim 1, The switching to the 1X mode of the hybrid terminal, the hybrid mobile communication system, characterized in that the searcher module to track and switch the frequency used by the searcher (Searcher) module in the 1X system under the control of a mobile station modem (MSM) chip. The method of claim 5, wherein in the forward link, A pilot channel through which the 1xEV-DO system transmits a pilot signal for tracking the hybrid terminal; A Medium Access Control (MAC) channel used for control of the reverse link; A control channel used to transmit a broadcast message or a direct message for directly controlling a specific hybrid terminal from the 1xEV-DO system to the hybrid terminal; And A traffic channel used to transmit only pure packet data from the 1xEV-DO system to the hybrid terminal. Hybrid mobile communication system, characterized in that used. The method of claim 1, The 1xEV-DO system provides a high-speed data transmission service at maximum power when transmitting high-speed data to one hybrid terminal in one sector in order to maximize throughput per sector and to allocate a high data rate to each user according to channel conditions. Hybrid mobile communication system, characterized in that for providing. The method of claim 7, wherein The pilot channel is a hybrid mobile communication system, characterized in that used for the purpose of the hybrid terminal for the coherent detection (Coherent Detection) of the radio base station of the 1xEV-DO system. The method of claim 7, wherein And the hybrid terminal receives one or more pilot signals transmitted through the pilot channel, and connects to a wireless base station that transmits the pilot signal having the greatest strength among the received pilot signals. 1xEV-DO system that switches call access to CDMA 2000 1X system (hereinafter referred to as '1X system') in case of failure of CDMA 2000 1x Evolution Data Optimized (EV-DO) system (hereinafter referred to as '1xEV-DO system') As a method of switching a call connection to a 1X system in case of failure, (a) initializing a 1X mode for communicating with the 1X system and a 1xEV-DO mode for communicating with the 1xEV-DO system to wait for communication; (b) performing dual monitoring on the 1X mode and the 1xEV-DO mode; (c) setting the 1xEV-DO mode to an active state to transmit and receive multimedia data; (d) requesting a call connection by transmitting a connection request message to the 1xEV-DO system; (e) determining whether a Connection Deny message has been received from the 1xEV-DO system; (f) stopping the operation of the 1xEV-DO mode and switching to the 1X mode to make the 1X mode active when the connection die message is received; And (g) transmitting and receiving data by executing a call connection to the 1X system; Method for switching a call connection to the 1x system in the event of a 1xEV-DO system failure comprising a. The method of claim 11, In step (e), if the connection response message is not received from the 1xEV-DO system and a connection response message is received, a call connection is established by establishing a connection and session with the 1xEV-DO system. A method for switching a call connection to a 1X system in the event of a 1xEV-DO system failure, characterized by performing high-speed data transmission and reception. The method of claim 11, In the step (a), it is set to the 1X mode to communicate with the 1X system in the idle state (Idle State), and to confirm whether high-speed data is received from the 1xEV-DO system in the 1X mode state And switching to the 1xEV-DO mode at a predetermined time interval and then back to the 1x mode. The method of claim 11, In step (b), while receiving the high speed data in the 1xEV-DO mode, the system switches to the 1X mode at regular intervals to check whether there is an incoming voice signal from the 1X system to the 1X mode. And returning to the 1xEV-DO mode when the 1xEV-DO system fails. The method of claim 12, wherein the setting of the session, Request a unicast access terminal identifier (UATI) to the 1xEV-DO system and receive and set the UATI from the 1xEV-DO system; The UATI is an ID of the hybrid terminal indicating a number assigned to the hybrid terminal in the 1xEV-DO system. When a session is established between the hybrid terminal and the 1xEV-DO system, a parameter to be used for setup, power control, and handoff of a high-speed data call is set. How to switch. The method of claim 11, In case of a forward link transmitted from the 1xEV-DO system to a hybrid terminal, a time division multiple access (TDMA) scheme is used. When a reverse link is transmitted from the hybrid terminal to the 1xEV-DO system, a code division multiple access (CDMA) method is used. How to switch. The method of claim 16, In the forward link, A pilot channel through which the 1xEV-DO system transmits a pilot signal for tracking the hybrid terminal; A Medium Access Control (MAC) channel used for control of the reverse link; A control channel used to transmit a broadcast message or a direct message for directly controlling a specific hybrid terminal from the 1xEV-DO system to the hybrid terminal; And A traffic channel used to transmit only pure packet data from the 1xEV-DO system to the hybrid terminal. A method of switching a call connection to a 1X system in the event of a 1xEV-DO system failure, characterized in that it is used. 18. The method of claim 17, wherein the pilot channel And the hybrid terminal is used for reference for coherent detection of a wireless base station of the 1xEV-DO system. The method of claim 17, The hybrid terminal receives one or more pilot signals transmitted through the pilot channel, and connects to a wireless base station that transmits a pilot signal having the largest signal strength among the received pilot signals. How to transfer a call to the system. The method of claim 14, Switching from the 1xEV-DO mode to the 1X mode is a 1xEV-DO system characterized in that the searcher module tracks and switches the frequency used by the searcher module in the 1X system under the control of a mobile station modem (MSM) chip. How to transfer a call to a 1X system in case of failure. Hybrid terminal (HAT) that switches call connection to CDMA 2000 1X system (hereinafter referred to as '1X system') in case of failure of CDMA 2000 1x EV-DO (Evolution Data Optimized) system (hereinafter referred to as '1xEV-DO system') Hybrid Access Terminal), Operate in a 1X mode for receiving a voice signal transmission service or a low speed data transmission service in conjunction with the 1X system, or in a 1xEV-DO mode for receiving a high speed data transmission service in connection with the 1xEV-DO system, When a call connection is attempted to the 1xEV-DO system to receive the high speed data transmission service, if a Connection Deny message is received from the 1xEV-DO system, the device switches to the 1X mode and connects to the 1X system. To receive data transfer service Hybrid terminal, characterized in that. The method of claim 21, The hybrid terminal is set to the 1X mode to communicate with the 1X system in an idle state, and the 1xEV-DO mode at regular time intervals to check whether data is received from the 1xEV-DO system. And switching back to the 1X mode again. The method of claim 21, When the hybrid terminal is receiving high-speed data from the 1xEV-DO system in the 1xEV-DO mode, the hybrid terminal switches to the 1X mode at regular intervals to check whether there is an incoming voice signal from the 1X system. And repeating the operation of returning to the 1xEV-DO mode. The method of claim 21, In the forward link for receiving data from the 1xEV-DO system to the hybrid terminal, a time division multiple access (TDMA) scheme is used. In the reverse link for transmitting data from the hybrid terminal to the 1xEV-DO system, a code division multiple access (CDMA) scheme is used. Hybrid terminal, characterized in that. The method of claim 21, The switching to the 1X mode of the hybrid terminal, the hybrid terminal, characterized in that the searcher module to track and switch the frequency used by the searcher module in the 1X system under the control of a mobile station modem (MSM) chip.