KR100836253B1 - Method and apparatus for controlling srns(serving radio network sub-system) relocation in wcdma(wideband code division multiple access) radio network - Google Patents

Abstract

A method and an apparatus for controlling SRNS(Serving Radio Network Sub-System) relocation in a WCDMA(Wideband Code Division Multiple Access) radio network are provided to perform an SRNS relocation process when an SRNS relocation timer is terminated, thereby using network resource more efficiently. A method for controlling SRNS relocation comprises the following steps of: determining whether all radio links, set in correspondence to a cell controlled by a serving RNC(Radio Network Controller), are removed out of the radio links set in a mobile terminal(S220); determining whether there is a cell controlled by the serving RNC in a monitoring set if the radio links are removed all, wherein the monitoring set is a set of cells monitored by the mobile terminal(S230); driving an SRNS relocation timer corresponding to the mobile terminal if there is the cell controlled by the serving RNC in the monitoring set(S250); and transmitting an SRNS relocation request message to a core network if the driven SRNS relocation timer is terminated(S270,S280).

Description

Method and apparatus for controlling SRS relocation in WCDMA wireless network {Method and Apparatus for Controlling Serving Radio Network Sub-System (SRNS) Relocation in Wideband Code Division Multiple Access (WCDMA) Radio Network}

1 is a WCDMA network configuration according to the present invention.

2 is a flow chart illustrating an SRNS relocation procedure, in accordance with the present invention.

3 is a state transition diagram for performing an SRNS relocation procedure according to the present invention.

4 is an RNC block diagram for performing an SRNS relocation procedure in accordance with the present invention.

5 is a structure of the SRNS relocation management database according to the present invention.

* Explanation of symbols on the main parts of the drawing

110: mobile terminal

130: Serving Radio Network Controller (SRNC)

160: target RNC

420: SRNS Relocation Timer

The present invention relates to a method and apparatus for relocating a serving radio network subsystem (SRNS) in a wideband code division multiple access (WCDMA) system, more specifically, an SRNC. Although the cell belonging to the monitoring set (Monitoring Set), even if the SRNS relocation timer expires by performing the SRNS relocation procedure, the present invention relates to a SRNS relocation control method that can more efficiently use the network resources.

The WCDMA network is mainly composed of a CN (Core Network), a UTRAN (Universal Terrestrial Radio Access Network), and a mobile terminal (hereinafter, referred to as 'UE (User Equipment)').

The UTRAN consists of one or more Radio Network SubSystems (RNS), and one RNS consists of one Radio Network Controller (RNC) and at least one base station NodeB.

Node B is managed by the RNC and serves as an access point of the UTRAN for a terminal that transmits information from a physical layer of a transmitting terminal to an uplink and a transmitting data to a terminal to a receiving side in a downlink. In charge of.

The RNC is responsible for the allocation and management of radio resources. The RNC, which is in charge of Node B direct management, is called the Control RNC (CRNC) and is responsible for the management of public radio resources.

A place that manages dedicated radio resources allocated to each terminal is called a serving RNC (SRNC).

The CRNC and the SRNC may be the same, but the CRNC and the SRNC may be different when the UE moves out of the SRNC to another RNC. The services provided to specific terminals are largely divided into circuit switched service and packet switched service.

For example, a general voice telephone service belongs to a circuit switched service, and a web browsing service through an internet connection is classified as a packet switched service.

In case of supporting circuit switched service, SRNC is connected with MSC (Mobile Switching Center) of core network, which is connected with GMSC for communication with external network.

At this time, the Gateway Mobile Switching Center (GMSC) is in charge of managing incoming or outgoing connections from another network (eg, including a PSTN network).

For packet switched services, services are provided by SGSN and GGSN of core network. The Serving GPRS Support Node (SGSN) supports packet communication destined for the SRNC, and the Gateway GPRS Support Node (GGSN) manages connections to other packet switched networks such as the Internet.

At this time, there is an interface (Interface) that can send and receive data for communication between the various network components, the interface between the RNC and the core network is defined as Iu interface.

In addition, when the Iu interface is connected to the packet switched area, it is called Iu-PS, and when it is connected to the circuit switched area, it is defined as Iu-CS.

In particular, the WCDMA system defines an Iur interface, which is an interface for transmitting and receiving control messages and data between RNCs.

The SRNS relocation function is used to efficiently use Iur link resources by releasing a preset Iu link and an Iur link and configuring an Iu link with a DRNC when it is determined that the UE has completely moved to the DRNC area during RNC handover. There is this.

That is, when the SRNS relocation procedure is completed, the DRNC becomes a new SRNC, and then transmission and reception of data and control messages to the core network is performed through the relocated Iu link.

According to the prior art, the conditions for driving SRNS relocation are: (1) an abnormal state of the Iur link (e.g., truncation or block state of the Iur link), (2) congestion of the Iur link, (3) All of the cells in the active set that are related to the SRNC are excluded from the active set, and (4) All of the cells in the monitoring set that are related to the SRNC are excluded from the monitoring set. It includes.

Here, the above conditions may be selectively used according to the situation of each network and the policy of the service provider.

The active set refers to a set of cells in which a wireless link is established with the mobile terminal, and the monitoring set refers to a set of cells to be measured by the mobile terminal.

That is, the mobile terminal measures the received signal level of the cell included in the monitoring set, and transmits the measured result to the SRNC. At this time, the SRNC determines whether to add the active set according to the received measurement result.

Particularly, in case (4) of the above conditions, if the terminal stays in the overlapping interval between the service area by the SRNC and the service area by the DRNC for a long time, a change in the monitoring set is less likely to occur. There was a problem with maintaining Iur links.

As a result, when the UE is located in the RNC boundary region and resides in the RNC boundary region for a long time, since the soft handover state between RNCs using Iur link is maintained, there is an inefficient aspect in utilizing Iur link resources.

In order to solve the problems of the prior art as described above, an object of the present invention is to provide a SRNS relocation control method capable of more efficient Iur link resource management.

Other objects of the present invention will be readily understood through the following description of the embodiments.

According to a preferred aspect of the present invention, the present invention discloses a SRNS relocation control method in a WCDMA wireless network.

WCDMA including a mobile terminal performing a soft handover between wireless network controllers, a core network, and a serving radio network controller (SRNC) having a direct data transmission link to the core network according to an embodiment of the present invention. A method of controlling a Serving Radio Network Sub-System (SRNS) relocation in a wireless network may include: (a) comparing all radio links established corresponding to a cell controlled by the SRNC among radio links established in the mobile terminal; (b) if the radio link set in the cell controlled by the SRNC is deleted as a result of the comparison of the step (a), comparing whether the cell controlled by the SRNC exists in the monitoring set, wherein the monitoring set Is a set of cells monitored by the mobile terminal; (c) if there is a cell controlled by the SRNC in the monitoring set as a result of the comparison in step (b), driving an SRNS relocation timer corresponding to the mobile terminal; and (d) the driven SRNS relocation timer. Expires may include transmitting to the core network an SRNS relocation request message including an SRNS relocation reason and a target radio network controller identifier.

According to another preferred aspect of the present invention, the present invention discloses a radio network controller equipped with an SRNS relocation control function in a WCDMA radio network.

According to an embodiment of the present invention, a wireless network controller for controlling a relocation of a Serving Radio Network Sub-System (SRNS) to a mobile terminal performing soft handover between the wireless network controllers maintains cell information corresponding to the mobile terminal. SRNS Relocation Management Database; An SRNS relocation timer for transmitting a timer expiration event to the controller when a preset time elapses; And a controller configured to drive an SRNS relocation timer according to the cell information, and generate the SRNS relocation control signal when the timer expiration event is received from the SRNS relocation timer. And a message transmitter / receiver for transmitting an SRNS relocation request message according to the SRNS relocation control signal generated by the controller.

According to a preferred aspect of the present invention, the present invention discloses a recording medium on which a program for executing the SRNS relocation control method in a WCDMA wireless network is recorded.

According to an embodiment of the present invention, a recording medium that can be read by an electronic device in which a program comprising typed instructions for executing a method of controlling Serving Radio Network Sub-System (SRNS) relocation in a WCDMA wireless network is (a). Determining whether all of the radio links established corresponding to the cells controlled by the SRNC are deleted among the radio links established in the mobile terminal; (b) if the radio link set in the cell controlled by the SRNC is deleted as a result of the determination in step (a), determining whether a cell controlled by the SRNC exists in the monitoring set, wherein the monitoring set Is a set of cells monitored by the mobile terminal; (c) if the cell controlled by the SRNC exists in the monitoring set as a result of the determination in step (b), driving an SRNS relocation timer corresponding to the mobile terminal; and (d) the driven SRNS relocation timer. Expires, a program for executing the SRNS relocation control method comprising sending an SRNS relocation request message to the core network is recorded.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings.

Hereinafter, a preferred embodiment of an SRNS relocation control method and apparatus thereof in a WCDMA wireless network according to the present invention will be described in detail with reference to the accompanying drawings.

In order to facilitate understanding of the present invention, the purpose and procedure of SRNS relocation will be briefly described below.

As the WCDMA system moves, the Iu access point between the mobile terminal and the core network (hereinafter referred to as 'CN (Core Network)') may be set to a shorter path, or in a UTRAN (Universal Terrestrial Radio Access Network). Support SRSR relocation procedure for radio resource redistribution.

Here, the Iu interface provides a path through which data and control information are exchanged between the UTRAN and the core network.

The UTRAN consists of one or more Radio Network Sub-Systems (RNS), and one RNS consists of one Radio Network Controller (RNC) and a plurality of base stations.

In addition, one base station may include at least one cell according to the shape.

In particular, the Iu interface is divided into an Iu-CS (Circuit Switched) interface connected to the circuit switched area and a Iu-PS (Packet Switched) interface connected to the packet switched area according to the core network area to which the mobile terminal is connected.

The WCDMA system defines an Iur interface for the transfer of user data and control information between two RNCs.

The Iur interface includes various functions for supporting handover of a mobile terminal, and signaling functions for this are defined in a Radio Network Subsystem Application Part (RANAP) protocol.

At this time, user data between RNCs is transmitted through FP (Frame Protocol).

In general, a mobile terminal connected to a WCDMA network needs to be connected to a core network in order to receive a specific service, and information between the mobile terminal and the core network is transferred via the UTRAN.

Each mobile terminal connected to the WCDMA network is managed by a specific RNC in the UTRAN, and this RNC is called a SRNC (Serving RNC).

More specifically, there is only one SRNC for a particular mobile terminal and not only serves as an access point to the core network, but also allocates radio resources necessary for providing related services.

In this case, the radio resource allocation includes all control functions related to a specific mobile terminal such as transmission channel setting, handover decision, and power control.

On the other hand, except for SRNC, all RNCs involved in data transmission of the mobile terminal are called DRNC (Drift RNC).

The mobile terminal may not have a DRNC or at least one DRNC according to a connection state.

In particular, when the mobile terminal moves in the RNC boundary area, an Inter RNC Handover is performed. In this case, the RNC that receives data from the SRNC and transmits the data to the mobile terminal is a DRNC.

In general, the SRNS relocation procedure is a procedure for changing the position of the SRNC when performing handover between RNCs, and refers to a series of procedures for changing one of the DRNCs into a new SRNC for a mobile terminal.

As a result, the SRNS relocation procedure not only provides the shortest path from the mobile terminal to the core network area by relocating the Iu link but also provides a method for efficiently controlling congestion that may occur in a specific RNC.

In the following description, a new SRNC determined by an existing SRNC among the DRNCs will be referred to as a target RNC.

Hereinafter, the SRNS relocation procedure will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a SRNS relocation procedure according to the present invention.

More specifically, FIG. 1 illustrates a transmission path of data in a mobile communication network when the mobile terminal 110 performs handover between RNCs in a boundary area between the serving RNC 120 and the target RNC 150. have.

Referring to FIG. 1, the mobile terminal 110 has one wireless link with each of the second base station 140 and the third base station 170, and receives the same data through each wireless link.

Here, the second base station 140 transmits and receives data with the serving RNC, and the third base station 170 receives the data from the target RNC 160.

In particular, the serving RNC 130 has a direct data connection point with the core network 180 and transmits data received from the core network 180 to the target RNC 160 via the Iur interface.

Here, it should be noted that the target RNC 160 does not have a direct data transmission path associated with the mobile terminal 110.

In general, the serving RNC 130 is a predetermined cell set for each mobile terminal 110 for mobility management, where the cell set includes an active set and a monitoring set. Manage it.

Here, the active set refers to a set of cells in which a wireless link is established with the mobile terminal 110, and the monitoring set refers to a set of cells to be measured by the mobile terminal 110.

That is, the mobile terminal 110 measures the received signal level of the cell included in the monitoring set and transmits the measured result to the serving RNC 130. At this time, the serving RNC 130 determines whether to update the active set and the monitoring set according to the received measurement result.

As a result, the serving RNC 130 may change the cell to be measured by the mobile terminal 110 as well as determine the addition or deletion of the radio link according to the received measurement result.

If the serving RNC 130 determines that the change of the active set is necessary, the serving RNC 130 transmits an active set update message including the changed active set information to the mobile terminal 110. .

On the other hand, when the serving RNC 130 determines that the monitoring set needs to be changed, the serving RNC 130 transmits a measurement control message including the changed monitoring set to the mobile terminal 110.

In particular, when all the radio links set in the mobile terminal 110 corresponding to the serving RNC 130 are deleted and all the cells controlled by the serving RNC 130 are deleted from the monitoring set, the serving RNC 130 is a target. The SRNS Relocation Request Message including the RNC identifier corresponding to the RNC 160 is transmitted to the core network 180.

The core network 180 establishes an Iu link with the target RNC 160, and then deletes the preset Iu link between the serving RNC 130 and the core network 180.

In addition, the core network 180 deletes the Iur link established between the serving RNC 130 and the target RNC 160 corresponding to the mobile terminal 110.

From this point on, the target RNC 160 serves as a serving RNC for the mobile terminal 110.

As a result, when the SRNS relocation function determines that the mobile terminal 110 has completely moved to the target RNS 150 area during the RNC handover, the SRNS relocation function releases the preset Iu link and the Iur link and replaces the new Iu link with the target RNC ( 160, the purpose is to efficiently use the Iur link resources.

That is, when the SRNS relocation procedure is completed, the target RNC 160 becomes a new serving RNC, and then transmission and reception of data and control messages to the core network 180 are performed through the relocated Iu link.

However, since the SRNS relocation procedure is conventionally performed when the cell controlled by the serving RNC 130 is deleted from both the active set and the monitoring set, the SRNC residing in the RNS boundary region for a long time, the SRNC There was a problem that the relocation procedure was not performed.

That is, since the data transmission path to the mobile terminal 110 includes the Iur link, the efficiency of the Iur link is inferior.

In order to solve the above problems, the present invention provides a serving RNC when all radio links corresponding to the serving RNC 130 are deleted during handover between RNCs, and a cell controlled by the serving RNC 130 exists in a monitoring set. The 130 drives the SRNC relocation timer and performs the SRNS relocation procedure when the RNC relocation timer expires, thereby enabling efficient Iur link resource control.

2 is a flow chart illustrating an SRNS relocation procedure, in accordance with the present invention.

As shown in FIG. 2, when the mobile terminal 110 is in a state of performing a handover in the RNS boundary area (S210), the serving RNC 130 corresponds to the mobile terminal 110 to serve the RNC 130. It is determined whether all of the radio links set in step S220 are deleted.

As a result of determination, when all radio links are deleted, the serving RNC 130 determines whether the monitoring set includes a cell controlled by the serving RNC 130 (S230).

As a result of the determination, when the monitoring set includes a cell controlled by the serving RNC 130, the serving RNC 130 compares whether the SRNS relocation timer control indicator is activated (ON) (S240).

Here, it should be noted that the SRNS relocation timer control indicator is a parameter that can be set by the system operator.

If the SRNS relocation timer control indicator is deactivated (OFF), the serving RNC 130 performs the SRNS relocation procedure only when all cells controlled by the serving RNC are deleted from the monitoring set.

As a result of the comparison, if the SRNS relocation timer control indicator is activated, the serving RNC 130 drives the SRNS relocation timer (S250).

Subsequently, the serving RNC 130 waits for reception of an event from a pre-driven SRNS relocation timer (S260).

The serving RNC 130 periodically checks whether an event corresponding to the expiration of the pre-driven SRNS relocation timer is received (S270).

As a result of the check, when the SRNS relocation timer that has been started expires, the serving RNC 130 transmits an SRNS relocation request message including the RNC identifier corresponding to the target RNC 160 to the core network 180, thereby performing the SRNS relocation procedure. Start (S280).

In step 270, when the check result, the SRNS relocation timer has not expired, the serving RNC 130 returns to step 260.

If there is a radio link established in the serving RNC 130 corresponding to the mobile terminal 110 in step 220, the serving RNC 130 maintains a handover state between the RNCs.

In particular, in step 230, when all cells controlled by the serving RNC 130 are deleted from the monitoring set, the serving RNC 230 performs step 280.

3 is a state transition diagram for performing an SRNS relocation procedure according to the present invention.

As shown in FIG. 3, the state used for determining whether to perform the SRNS relocation procedure is the idle state 305, the inter-RNC handover state 310, the monitoring aggregation state 315, and the SRNC relocation timer driving state 320. ).

In this case, the idle state 305 refers to a state in which there is no radio link established in the serving RNC 130 corresponding to the corresponding mobile terminal 110.

In addition, the idle state 305 according to the present invention refers to a state in which all radio links corresponding to the mobile terminal 110 are not deleted but at least one radio link is maintained with the target RNC 160.

In particular, since the SRNS relocation procedure is basically a procedure for determining whether or not to be performed by the serving RNC 130 during the progress of the RNC handover, the initial state in the state transition diagram becomes the inter-RNC handover state 310. .

If all radio links corresponding to the serving RNC 130 are deleted in the RNC handover state 310, the serving RNC 130 transitions the state of the mobile terminal 110 to the monitoring aggregation state 315 ( S340).

When the state of the mobile terminal 110 transitions to the monitoring set state 315, the serving RNC 130 first compares whether the monitoring set includes a cell controlled by the serving RNC 130.

As a result of the comparison, when all cells controlled by the serving RNC 130 are deleted from the monitoring set, the serving RNC 130 immediately performs the SRNS relocation procedure and then transitions to the dormant state 305 (S390).

On the other hand, if there is a cell controlled by the serving RNC 130 in the monitoring set and the SRNS relocation timer control indicator described above is activated in FIG. 2, the serving RNC 130 drives the SRNS relocation timer and then the mobile terminal ( The state of 110 is shifted to the SRNS relocation timer driving state 320 (S350).

If the pre-driven SRNS relocation timer expires in the SRNS relocation timer driving state 320, the serving RNC 130 transitions the state of the mobile terminal 110 to the dormant state 305 after performing the SRNS relocation procedure. Let's do it.

In particular, in any one of the monitoring aggregation state 315 and the SRNS relocation timer driving state 320, when a new radio link corresponding to the serving RNC 130 is established, the serving RNC 130 is connected to the mobile terminal ( The state 110 is transitioned to the RNC handover state 310 (S360 to S390).

4 is an RNC block diagram for performing an SRNS relocation procedure according to the present invention.

Referring to FIG. 4, the serving RNC 130 according to the present invention includes a controller 410, an SRNS relocation timer 420, a message transceiver 430, and an SRNS relocation management database 440.

In particular, FIG. 4 illustrates only the components necessary for serving RNC 130 in performing the SRNS relocation procedure disclosed herein.

That is, it should be noted that the components necessary to perform the general RNC function are not included in this drawing.

The controller 410 determines whether to perform the SRNS relocation procedure by referring to the state, active set, and monitoring set information of the mobile terminal 110 maintained in the SRNS relocation management database 440.

In addition, the controller 410 not only controls the operation of the SRNS relocation timer 420 but also performs the SRNS relocation procedure according to the timer expiration event received from the SRNS relocation timer 420.

If it is determined to perform the SRNS relocation procedure corresponding to the mobile terminal, the serving RNC 130 generates an SRNS relocation request message and transmits the SRNS relocation request message to the message transceiver 430.

Thereafter, the message transceiver 430 transmits the received SRNS relocation request message to the core network 180.

The SRNS relocation timer 420 is driven according to the control signal of the controller 410, and when the pre-driven SRNS relocation timer 420 expires, the SRNS relocation timer 420 transmits a timer expiration event signal including a timer identifier to the controller 420. .

Here, the timer identifier is assigned by the controller 410 as an identifier for distinguishing the SRNS relocation timer 420 driven in correspondence with a specific mobile terminal.

When the SRNS relocation timer 420 needs to be driven in response to a specific mobile terminal, the controller 410 dynamically allocates a timer identifier and stores the assigned timer identifier in the SRNS relocation management database 440. .

If the control unit 410 receives a timer expiration event including a timer identifier from the SRNS relocation timer 420, the control unit 410 refers to the SRNS relocation management database 440 to identify the mobile terminal to which the corresponding timer identifier is assigned. After checking, the SRNS relocation procedure for the mobile terminal is performed.

The structure of the SRNS relocation management database 440 according to the present invention will be described later with reference to the related drawings (FIG. 5).

5 is a block diagram showing the structure of the SRNS relocation management database according to the present invention.

As shown in Figure 5, SRNS relocation management database 440 according to the present invention is composed of the first to the N-th record, each record is a terminal identifier 510, terminal status 520, active set 530 ), Monitoring set 540, SRNS relocation timer status 550 and timer identifier 560 fields.

The terminal identifier 510 field is an identifier for identifying the mobile terminal 110 in the RNC and may be a phone number corresponding to the mobile terminal 110 or a unique identifier assigned according to a call setup request of a specific mobile terminal.

The terminal state 520 field includes an idle state 305, an inter-RNC handover state 310, a monitoring set state 315, and an SRNS relocation timer driving state (shown in the state transition diagram for performing the SRNS relocation procedure of FIG. 3). It may have a value corresponding to any one of 320).

The active set 530 field is a set of cell IDs for which a wireless link is established with the corresponding mobile terminal, where the cell ID is an identifier for identifying the corresponding cell in the mobile communication network.

In general, the RNC can identify whether the cell is included in the RNS controlled by the cell ID.

That is, the serving RNC 130 according to the present invention may distinguish whether a cell controlled by itself is included among cell IDs included in the active set 530 field.

The monitoring set 540 field is a set of cell IDs corresponding to the cells monitored by the mobile terminal.

The serving RNC 130 according to the present invention performs the SRNS relocation procedure when there is no cell controlled by the self in the monitoring set 540.

The SRNS relocation timer status 550 field is a field for indicating whether or not there is an SRNS relocation timer driven corresponding to the corresponding mobile terminal.

The timer identifier 560 is a unique identifier assigned to each SRNS relocation timer that is driven.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

As described above, the present invention has an advantage of providing an SRNS relocation control method capable of more efficient Iur link resource management.

In addition, the present invention has the advantage of providing a function to perform SRNS relocation when all of the activated radio links are deleted in the cell controlled by the SRNC and at the same time there is no cell controlled by the SRNC in the monitoring set.

Claims (9)

In the method for controlling the relocation of a Serving Radio Network Sub-System (SRNS) in a wireless network controller, (a) determining whether all of the radio links set corresponding to the cells controlled by the serving radio network controller are deleted among the radio links set in the mobile terminal; (b) determining that the cell controlled by the serving radio network controller exists in the monitoring set when all radio links set in the cell controlled by the serving radio network controller are deleted as a result of the determination of step (a). Wherein the monitoring set is a set of cells monitored by the mobile terminal; (c) driving the SRNS relocation timer corresponding to the mobile terminal if a cell controlled by the serving radio network controller exists in the monitoring set as a result of the determination of step (b); and (d) transmitting an SRNS relocation request message to the core network when the driven SRNS relocation timer expires. SRNS relocation control method comprising a. The method of claim 1, As a result of the determination of step (b), If there is no cell controlled by the serving radio network controller in the monitoring set, the serving radio network controller generates the SRNS relocation request message and transmits the SRNS relocation request message to the core network. The method of claim 1, If all the cells controlled by the serving radio network controller among the cells included in the monitoring set are deleted before the driven SRNS relocation timer expires, the serving radio network controller generates the SRNS relocation request message to generate the core network. SRNS relocation method, characterized in that to transmit to. The method of claim 1, If the radio link corresponding to the cell controlled by the serving radio network controller is established before the SRNS relocation timer expires, the serving radio network controller maintains a soft handover state between the radio network controllers. Relocation control method. The method of claim 1, A value of an SRNS relocation timer control indicator is set according to a predetermined control signal input to the serving radio network controller, and the serving radio network controller is an SRNS using the SRNS relocation timer according to the set value of the SRNS relocation timer control indicator. SRNS relocation control method characterized in that it determines whether to perform the relocation control method. The method of claim 1, The step (a) is SRNS relocation control method characterized in that, if the radio link exists, maintains a soft handover state between radio network controllers. In the wireless network controller for controlling the relocation of the Serving Radio Network Sub-System (SRNS) to the mobile terminal performing a soft handover between the wireless network controller, An SRNS relocation management database that maintains cell information corresponding to the mobile terminal; An SRNS relocation timer for transmitting a timer expiration event to the controller when a preset time elapses; And A controller for driving the SRNS relocation timer according to the cell information and generating the SRNS relocation control signal when the timer expiration event is received from the SRNS relocation timer; Message transmission and reception unit for transmitting the SRNS relocation request message according to the SRNS relocation control signal generated by the control unit Wireless network controller comprising a. The method of claim 7, wherein The cell information may include active set information and monitoring set information. A recording medium readable by an electronic device on which a program comprising typed instructions for executing a method of controlling a Serving Radio Network Sub-System (SRNS) relocation in a wireless network controller, comprising: (a) determining whether all of the radio links set corresponding to the cells controlled by the serving radio network controller are deleted among the radio links set in the mobile terminal; (b) determining that the cell controlled by the serving radio network controller exists in the monitoring set when all radio links set in the cell controlled by the serving radio network controller are deleted as a result of the determination of step (a). Wherein the monitoring set is a set of cells monitored by the mobile terminal; (c) driving the SRNS relocation timer corresponding to the mobile terminal if a cell controlled by the serving radio network controller exists in the monitoring set as a result of the determination of step (b); and and (d) recording a program for executing the SRNS relocation control method, including transmitting an SRNS relocation request message to the core network when the driven SRNS relocation timer expires.

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