KR20080040655A - Method for voice and video call service in femtocell system dedicated to hspd wcdma and femtocell system thereof - Google Patents

Abstract

A method for providing a voice and video call service in a femto cell system dedicated to a WCDMA PD service and a femto cell system thereof are provided to supply users within a femto cell with an HSPD(High Speed Packet Data) service by installing a PD dedicated femto cell in a hot spot area and provide the users seamlessly with a voice and video call transmitting/receiving service through an existing WCDMA mobile communication network. An RRC(Radio Resource Control) connection request message is received from femto cell subscriber UE(User Equipment)(S201). A femto cell base station determines whether the received RRC connection request message is for a voice call or a video call(S203). If the RRC connection request message is for the voice call or the video call, an RRC connection release message including redirection information is transmitted to the UE to release connection with the UE(S207). The UE receiving the RRC connection release message from the femto cell base station performs frequency transfer into FA#1 as a frequency included in the redirection information(S209). The UE transmits an RRC connection request message to an RNC(Radio Network Controller) through a node-B to request connection to a WCDMA(Wideband Code Division Multiple Access) mobile communication network, and performs a process for voice or video call setup(S211,S213).

Description

Method for voice and video call service of femtocell system dedicated to WCDMA packet data service and its femtocell system {Method for Voice and Video Call Service in Femtocell System Dedicated to HSPD WCDMA and Femtocell System}

The present invention provides a voice and video call service method of a femto cell supporting a high speed packet data (HSPA) dedicated service in a wideband code-division multiple access (WCDMA) mobile communication environment. The femtocell system.

Femto Cell (Femto Cell) is a small base station that provides a mobile communication service to an area of about 200m radius. It is mainly installed in areas where shadows of the macro cell are degraded, such as homes or buildings, or in shaded areas, to compensate for the quality of mobile communication services. In particular, the femtocell uses a universal Internet line for communication with the core network, the core control station of the mobile communication network, so that installation cost and maintenance cost are low, and since the femtocell can be installed anywhere in the area where the Internet line is installed, There is an advantage.

Among femtocells, femtocells dedicated to packet data services will be able to provide high-speed packet data services to femtocell subscribers.However, since femtocells do not process voice or video calls, femtocell subscribers can provide voice and video call services. Is required.

If this problem is solved, it will be possible to provide high-speed packet data service at a low price even in a hot spot area than using a conventional Wideband Code-Division Multiple Access (WCDMA) mobile communication network.

An object of the present invention is to enable a terminal receiving a WCDMA service to receive a continuous voice and video call / incoming service from a femtocell dedicated to a packet data service through a macro base station of an existing WCDMA mobile communication network. The present invention provides an audio and video call service method and a femtocell system thereof.

In order to achieve the above object, a voice call and video call service method of a dedicated femtocell system for a WCDMA packet data service according to the present invention includes: receiving an RRC connection request message from a femtocell subscriber station; Determining whether the received RRC connection request message is for a voice or video call; And when it is determined that the RRC connection request message is for a voice or video call, transmits an RRC connection release message including a redirection info to the terminal to connect with the terminal. It includes the step of releasing.

Here, the redirection information includes information about the frequency for causing the terminal to transition to a frequency of a WCDMA network that will provide a voice or video call connection service. In addition, the RRC connection request message is a response to a call attempt and paging, and the terminal receives a voice or video call service through a WCDMA network.

Specifically, receiving the RRC connection request message generated in response to paging includes: receiving a paging message for calling the terminal from a mobile switching center (MSC) of a core network; Converting the paging message in an RRC layer and providing the paging message to the terminal; And receiving the RRC connection request message from the terminal receiving the paging message.

A femtocell system installed in a WCDMA network providing a WCDMA mobile communication service according to another embodiment of the present invention is connected to a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN) through an access gateway (AGW). It includes a femtocell base station for providing a high-speed packet data service to the terminal subscribed to the femtocell.

When the femtocell base station determines that the RRC connection request message received from the terminal is for a voice or video call, the femtocell base station transmits an RRC disconnection message including redirection information to the terminal to release the connection with the terminal.

According to the present invention, it is possible to provide a high speed packet data service for a hot spot area at a lower price than using a conventional WCDMA mobile communication network. In other words, by installing a femtocell dedicated to packet data in a hot spot area, it provides high-speed packet data service to users entering the femtocell and simultaneously provides incoming and outgoing services for voice and video calls over existing WCDMA mobile networks. Can provide.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a structure of a mobile communication network including a femto cell dedicated to packet data.

Referring to FIG. 1, a femto cell C2 is included in coverage of a macro cell C1 and a macro cell C1 under a wideband code-division multiple access (WCDMA) mobile communication network 100. Is shown. The macro cell C1 and the femtocell C2 are connected to the core network C3.

The WCDMA mobile communication network for voice or video call service is connected to a Radio Network Controller (RNC) 133 and an RNC 133 that control radio resources of the Node-B 131 and the Node-B 131 to perform circuit switching. Mobile Switching Center (MSC) 135 to perform, and the XGSN 115 is connected to the RNC 133 to perform a packet exchange. The xGSN 115 includes a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN).

The femtocell (C2) of the present invention supports high speed packet data (HSPA) dedicated services including high speed downlink packet access (HSDPA) and high speed uplink packet access (HSUPA) based on WCDMA protocol.

The femtocell base station 111 performs wireless transmission / reception for a high speed packet data service (HSPA) based on WCDMA with a terminal 150 in a femtocell C2, and includes a function of a Node-B and a function of an RNC. Accordingly, the femtocell base station 111 may be connected to the MSC 135 in relation to paging for receiving an audio or video call. In addition, the femtocell base station 111 is connected to an access gateway (AGW) 113 through a secure tunnel, and the AGW 113 is connected to an xGSN 115 to relay a packet service.

The femtocell base station 111 may use an independent FA (hereinafter referred to as 'FA # 2') different from the FA (Frequency Assignment) (hereinafter, referred to as 'FA # 1') used in the macro cell C1. If two or more FAs are used in the macro cell C1, FA # 2 used by the femtocell base station 111 may be the same as one of the FAs used by the macro cell C1.

The terminal 150 is a femtocell (C2) subscriber station, and maintains the FA # 2 of the femtocell (C2) in the idle state, the femtocell base station 111 provides a high-speed packet data service for the terminal 150 do.

However, when the terminal 150 requests a voice and / or video call originating service or receives an incoming service in an idle state, the femtocell base station 111 that receives the connection request causes the terminal 150 to perform a service redirection. According to the method, the frequency shift is controlled to the WCDMA mobile communication network of the macro cell C1. And the voice and video call service of the terminal 150 is made in the macro cell (C1). Referring to FIG. 1, the data path when the terminal 150 requests the high speed packet data service is indicated by a double solid line, and the data path when the terminal 150 requests the voice or video call service is a single line. It is shown by the solid line.

Hereinafter, a method of providing a voice and / or video call service by a service redirection method will be described with reference to FIGS. 2 and 3.

2 is a flowchart provided to explain a voice call and a video call origination procedure according to an embodiment of the present invention.

Referring to FIG. 2, when a terminal 150 in a femtocell C2 is requested to make a voice or video call from a subscriber, the terminal 150 sets an RRC connection request message (RRC) to set a path for transmitting a signaling message. Connection request) to the femtocell base station 111. The RRC connection request message includes an initial UE identity of the terminal 150 and an RRC establishment cause. There are various reasons for the RRC connection, and includes a call attempt or a response to paging (S201).

When the femtocell base station 111 receives the RRC connection request message from the terminal 150, the femtocell base station 111 determines whether the outgoing call is a voice or video call based on the RRC connection reason included in the RRC connection request message (S203).

As a result of the determination in step S203, when the received outgoing call is a high speed packet data call, the femtocell base station 111 performs a normal high speed packet data call setup process (S205).

As a result of the determination in step S203, when the received outgoing call is not a high speed packet data call, the femtocell base station 111 connects to the terminal 150 by transmitting an RRC connection release message including a redirection information. Release it. The redirection information includes information on a frequency to be redirected (eg, FA # 1) (S207).

The terminal 150 receiving the RRC connection release message from the femtocell base station 111 transitions to FA # 1, which is a frequency included in the redirection information (S209).

The terminal 150 transmits an RRC connection request message to the RNC 133 through the Node-B 131 to request access to the WCDMA mobile communication network, and performs a procedure for establishing a voice or video call (S211, S213). .

The procedure for call setup in step S213 will be briefly described as follows, and the 3GPP Release 1999 specification and later published specifications can be applied.

First, when the RNC 133 receives an RRC connection request message from the terminal 150, the RNC 133 responds by transmitting an RRC Connection Setup message to the terminal 150. The RRC Connection Setup message includes information on whether a dedicated channel (DCH) transport channel is allocated. The terminal 150 completes the resource setting for the RRC Connection Setup and delivers an RRC Connection Setup Complete message including the result to the RNC 133. The terminal 150 sends a service request message to the core network 170 through a signaling message bearer (SRB), and exchanges information related to authentication of the request terminal and encryption of traffic in the core network 170. . Subsequently, after performing a user radio transmission bearer (RAB) setting process and an incoming call setting process, a call path is opened and the voice and / or video traffic is transmitted and received. The call ends when the call ends.

In the above-described method, when the femtocell base station 111 receives a request for setting up a voice or video call from the terminal 150 existing in the femtocell C2, the femtocell base station 111 transitions to the FA of the macrocell C1 and performs a normal operation. Receive call service by WCDMA network.

This method enables the femtocell C2 to provide a high-speed packet data service exclusively while providing a voice or video call setup service without interruption. This, on the contrary, makes it possible for network operators to provide subscribers with high speed packet data services at low prices. In particular, in the hotspot area, it is possible to provide a faster packet data service at a lower price than using a conventional WCDMA mobile communication network.

Call setup for receiving an audio or video call is similar to FIG. 2. The femtocell base station 111 controls the terminal 150 to frequency shift to the FA of the WCDMA network according to the service redirection method. 3 is a flowchart provided to explain a voice call and a video call incoming procedure according to an embodiment of the present invention.

The femtocell base station 111 receives a paging message for the reception of a voice or video call for the terminal 150 in the femtocell C2 from the MSC 135 of the core network 170. The femtocell base station 111 delivers the received paging message to the terminal 150 through a Radio Resource Control (RRC) layer. The RRC converts the received message for the idle mode terminal 150 into a paging type 1 message, and converts the received message for the connected mode terminal 150 into a paging type 2 message. ) To the message (S301).

According to the voice or video call connection request of the user, the terminal 150 transmits the RRC connection request message to the femtocell base station 111 (S303).

When the femtocell base station 111 receives the RRC connection request message from the terminal 150, it determines whether the call is a packet data call (S305).

As a result of the determination in step S305, when the received call is a high speed packet data call, the femtocell base station 111 performs a normal high speed packet data call setup process (S307).

As a result of the determination in step S305, if the received call is not a high-speed packet data call, the femtocell base station 111 releases the connection by transmitting an RRC connection release message including the redirection information to the terminal 150. Redirection information included in the RRC connection release message includes information on an FA to be redirected (eg, FA # 1) (S309).

The terminal 150 receiving the RRC connection release message from the femtocell base station 111 transitions to FA # 1, which is an FA included in the redirection information (S311).

The terminal 150 transmits an RRC connection request message to the RNC 133 through the Node-B 131 to request access to the WCDMA mobile communication network, and performs a procedure for establishing a voice or video call (S313 and S315). .

According to the above method, when the femtocell base station 111 is requested to set up a voice or video call according to an incoming call from the terminal 150 existing in the femtocell C2, the terminal 150 causes the FA of the macrocell C1 to be transmitted. Transition to the network to receive the call service by the normal WCDMA network.

The invention can be implemented in methods, devices and systems. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored in a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

The media that can be processed by the microprocessor include electronic circuits, semiconductor memory devices, ROMs, flash memory, electrically erasable programmable read-only memory (EEPROM), floppy disks, optical disks, and hard disks. (Hard) Includes the ability to transmit and store information such as disks, fiber optics, wireless networks, and the like. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a diagram schematically illustrating a structure of a mobile communication network including a femto cell dedicated to packet data;

2 is a flowchart provided to explain a voice call and a video call origination procedure according to an embodiment of the present invention; and

3 is a flowchart provided to explain a voice call and a video call incoming procedure according to an embodiment of the present invention.

Claims (5)

Receiving an RRC Connection Request message from a femtocell subscriber station; Determining whether the received RRC connection request message is for a voice or video call; And As a result of the determination, when it is determined that the RRC connection request message is for a voice or video call, an RRC connection release message including a redirection information is transmitted to the terminal to establish a connection with the terminal. Decommissioning, The redirection information includes information about the frequency for causing the terminal to transition to a frequency of a WCDMA network to provide a voice or video call connection service. And video call service method. The method of claim 1, The RRC connection request message is a voice call and video call service method of a femtocell system dedicated to a WCDMA packet data service, characterized in that according to a response to a call attempt and paging. The method according to claim 1 or 2, Receiving the RRC connection request message, Receiving a paging message for calling the terminal from a mobile switching center (MSC) in a core network; Converting the paging message in an RRC layer and providing the paging message to the terminal; And Receiving the RRC connection request message from the terminal receiving the paging message; and a voice and video call service method of a femtocell system for a dedicated WCDMA packet data service. A femtocell system installed in a WCDMA network providing a WCDMA mobile communication service, It is connected to a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN) through an Access GateWay (AGW) to include a femtocell base station that provides a high-speed packet data service to a terminal subscribed to the femtocell, When the femtocell base station determines that the RRC connection request message received from the terminal is for a voice or video call, the femtocell base station transmits an RRC disconnection message including redirection information to the terminal to release the connection with the terminal. And the redirection information includes information on the frequency for causing the terminal to transition to a frequency of the WCDMA network to provide a voice or video call connection service. The method of claim 4, wherein The RRC connection request message, femtocell system dedicated to the WCDMA packet data service, characterized in that according to the response to the call attempt and paging (paging).

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