KR101176371B1 - Roaming Control Method of Asynchronous Mobile Communication System and Asynchronous Mobile Communication System therefor - Google Patents

Abstract

The present invention relates to a roaming control method in an asynchronous mobile communication system for controlling connection switching of a mobile communication terminal and an asynchronous mobile communication system for the same.

The present invention is connected to a plurality of Node B to control Node B, and the mobile communication terminal to induce the network search of the mobile communication terminal to switch the connection from any currently selected roaming induced FA cell to a plurality of general FA cells of another layer A wireless network controller configured to set a second access switching inducing condition such that the first access switching inducing condition and the power strength of each of the plurality of general FA cells are greater than the power strength of the roaming inducing FA cell; And a node B for transmitting a control signal including a first access switching induction condition and a second access switching induction condition received from the radio network controller to a corresponding cell area to allow the mobile communication terminal to switch to a general FA cell of another layer. Including, there is an advantage that the mobile communication terminal can efficiently control the connection switching of the mobile communication terminal regardless of whether the mobile communication terminal supports the network directed handover (Network Directed Handover).

Description

Roaming control method in asynchronous mobile communication system and asynchronous mobile communication system for same {Roaming Control Method of Asynchronous Mobile Communication System and Asynchronous Mobile Communication System therefor}

1 is a diagram showing the configuration of an asynchronous mobile communication system according to the present invention;

2 is a view for briefly explaining a concept of roaming control in an asynchronous mobile communication system according to the present invention;

3 is a flowchart illustrating an embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention;

4 is a flowchart for explaining another embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention;

5 is a flowchart for explaining another embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention.

<Description of the symbols for the main parts of the drawings>

11, 13, 15: general node B 17: induced node B

21, 23: RNC 30: MSC

40: core network 100: mobile communication terminal

The present invention relates to a roaming control method in an asynchronous mobile communication system, and more particularly, to a roaming control method in an asynchronous mobile communication system for controlling connection switching of a mobile communication terminal and an asynchronous mobile communication system for the same.

In mobile telecommunications, roaming service allows subscribers to use mobile telecommunications service anywhere, across regions or borders. In particular, international roaming is based on agreements between mobile telecommunications providers. Means to use the mobile communication service.

The asynchronous mobile communication system is developed in consideration of an international roaming service, and a roaming service in an asynchronous mobile communication system may be divided into roaming through a mobile communication terminal and roaming through a subscriber identification card (for example, a SIM card). Roaming services through subscriber identity cards offer the advantage of enabling the use of communication services between mobile networks with different radio access schemes, thus providing interoperability between a wider range of systems employing different radio communication technologies. Instead of carrying a mobile communication terminal, a subscriber can access a desired mobile communication network by simply carrying a subscriber identification card and inserting it into another mobile communication terminal. In particular, roaming by the subscriber identity card does not depend on the access system used by each mobile communication network, so there is an advantage that the connection to any communication network does not suffer from technical obstacles.

On the other hand, for the international roaming service, as mentioned above, agreement between mobile carriers between countries is required.In case of one-to-one agreement between the home network operator and the roaming network operator, the subscriber's terminal entering the roaming network is the communication network of the contracted party. In case of agreement on a one-to-many basis, one of a plurality of communication networks should be selected and connected.

To this end, any one of a method of manually selecting and accessing a communication network to roam among the accessible communication networks displayed on the mobile communication terminal and a method of automatically connecting to a communication network to roam from the mobile communication terminal are used. Here, in the automatic access method, if the mobile communication terminal attempts to access the home access network from the list of accessible network networks and fails, the mobile communication terminal refers to the roamable network information and accesses any one roaming network. There is a method of selecting any one of the base stations, a method of selecting a base station having the best performance by comparing the base station reception power received by the terminal.

Among these methods, the subscriber manually selects the communication network because it is difficult for the subscriber to directly grasp the network information, and it is not easy to input the communication network information into the terminal or the subscriber identification card. The main method is to select a base station with the best performance.

However, when the mobile communication provider has negotiated one-to-many, it takes a lot of time for cell search and radio wave environment measurement to selectively connect with any one of a plurality of communication networks, resulting in a deterioration in service quality.

As a method for improving the problem, the present applicant uses Korean Patent Application No. 10-2005-0097791 (filed October 17, 2005) to reduce the searching time of a mobile communication terminal using the induced node B. It has been filed.

More specifically, the serviceable area by the induction node B is divided into three sectors, and the mobile communication terminal is roamed by a channel having a high control channel allocation among the plurality of channels used in the induction node B, and thus three sectors. Is connected to any one of the corresponding cells (roaming cell).

After the roaming mobile communication terminal completes the communication network selection and the preparation for the communication in this manner, the induction node B causes the mobile communication terminal to perform a handover to the cell to which another channel in the same sector is allocated, so that the mobile communication terminal is a general channel. It is connected to Node B through (the channel whose allocation rate of traffic channel is higher than control channel) so that real service including call connection is available. Here, the handover uses a network directed handover method.

However, some of the mobile communication terminals do not support network-directed handover, so there is a problem in that the handover using the above-described induction node B cannot be applied to some terminals.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and is effective for efficiently controlling access switching of a mobile communication terminal in an asynchronous mobile communication system regardless of whether a mobile communication terminal supports network directed handover. There is a technical problem to provide a roaming control method in an asynchronous mobile communication system and an asynchronous mobile communication system for the same.

The present invention for achieving the above object is an asynchronous mobile communication system for controlling roaming,

A node B is connected to a node B including a plurality of general node Bs and an induction node B to control the node B, and the plurality of general frequency allocations of different layers are allocated from a roaming frequency allocation cell (FA) selected by the mobile communication terminal. A first connection switching induction condition for inducing network discovery of the mobile communication terminal to switch to one of the cells and a second power such that the power strength of each of the plurality of general frequency allocation cells is greater than that of the roaming induced frequency allocation cell; A wireless network controller for setting a connection switching induction condition; And a node for transmitting a control signal including a first access switching induction condition and a second access switching induction condition received from the radio network controller to a corresponding cell area so that the mobile communication terminal switches to a general frequency allocation cell of another layer. B; includes.

Another invention is an asynchronous mobile communication system for controlling roaming,

A node B which is connected to a node B including a plurality of general node B and an induction node B, controls the node B, and has a different layer from a frequency frequency allocation (FA) cell to which a mobile communication terminal in idle state is currently connected. A connection switching condition that prevents the switching to the roaming induced frequency allocation cell of the mobile station; a connection switching induction condition that enables the switching to the general frequency allocation cell of the same layer; A radio network controller configured to set any one of handover constraints not to perform handover to a roaming induced frequency allocation cell of a layer; And a node B connected to the wireless network controller and transmitting a control signal including the connection switching restriction condition, the handover restriction condition, or the connection switching induction condition from the wireless network controller to a corresponding cell area. It includes.

Yet another embodiment of the present invention provides asynchronous mobile communication including a plurality of general node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel for transmitting a control signal with a power intensity greater than that of other channels among the plurality of channels. Roaming control method in the system,

a) a first access switching inducing condition for inducing a network search of the mobile communication terminal so that a mobile communication terminal selecting a roaming frequency frequency (FA) cell switches to one of a plurality of general frequency allocation cells of another layer; And setting a second access switching inducing condition in which the power strength of each of the plurality of general frequency allocation cells is greater than the power strength of the roaming induction frequency allocation cell. And b) transmitting a control signal including the first access switching inducing condition and the second access switching inducing condition to a corresponding cell region.

Yet another embodiment of the present invention provides asynchronous mobile communication including a plurality of general node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel for transmitting a control signal with a power intensity greater than that of other channels among the plurality of channels. Roaming control method in the system,

a) Roaming induction frequency of a different layer from a general frequency allocation cell to which a mobile communication terminal in idle state, which is switched from a roaming frequency allocation cell to one of a plurality of general frequency allocation cells, is currently connected Setting an access switching restriction condition so as not to switch back to the assigned cell; And b) transmitting a control signal including the access switching restriction condition set in step a) to the corresponding cell area.

Yet another embodiment of the present invention provides asynchronous mobile communication including a plurality of general node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel for transmitting a control signal with a power intensity greater than that of other channels among the plurality of channels. Roaming control method in the system,

a) Roaming induction frequency of another layer from a general frequency allocation cell to which a mobile communication terminal in a traffic state which is switched from a roaming frequency allocation cell (FA) to one of a plurality of general frequency allocation cells is currently connected Setting a handover constraint to prevent handover to the assigned cell; And b) transmitting a control signal including the handover restriction condition set in the step a) to the corresponding cell area.

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

FIG. 1 is a diagram illustrating a configuration of an asynchronous mobile communication system according to the present invention, which will be described with reference to FIG. 2 for briefly explaining a concept of roaming control in an asynchronous mobile communication system.

As shown, the asynchronous mobile communication system includes a general node B (11, 13, 15) and a plurality of general node B (11, 13, 15) as a base station for performing wireless section communication with the mobile communication terminal 100; Is connected to a radio network controller (RNC) 21, 23 for controlling a general Node B and a plurality of radio network controllers 21, 23 to perform a call exchange to provide a service to the mobile communication terminal 100. Is connected to the asynchronous exchange (MSC) 30 and the asynchronous exchange, and consists of a core network 30 to provide a core function for mobile communication services. In addition, the asynchronous mobile communication system of the present invention further includes at least one induction node B 17 connected to the radio network controller 23.

In general, the general Node Bs 11, 13, and 15 divide the serviceable area into three or more sectors, and each sector consists of a plurality of cells. In addition, the general node B (11, 13, 15) actually transmits information for voice or data service through the traffic channel, and transmits a control signal or an auxiliary signal for transmitting and receiving traffic information through the control channel. A traffic channel and a control channel are allocated at a ratio of about 9: 1, and the mobile communication terminal 100 selects an access target base station using information included in a common pilot channel (CPICH) among control channels.

Increasing the ratio of the control channel including the common pilot channel to the traffic channel may increase the output of the control channel. As a result, the mobile communication terminal 100 may select a base station having a large output of the control channel.

Therefore, the induction node B 17 includes at least one roaming channel having a high control channel allocation rate in a plurality of channels to induce roaming of the mobile communication terminal 100 to induce roaming of the mobile communication terminal.

On the other hand, the wireless network controller 23 is roaming induced frequency allocation (FA) by roaming by a roaming channel having a high control channel allocation among a plurality of channels used by the mobile communication terminal 100 in the induction node B (17) After being connected to a cell (hereinafter, referred to as FA), a normal FA cell of another layer (Inter) serviced by a general channel (a channel having a higher allocation rate of a traffic channel than a control channel) for providing a smooth voice or data service. A connection switching induction condition is set to reselection (① in FIG. 2), and the mobile node is transmitted to the corresponding cell of the induction node B 17 or the plurality of general node Bs 11, 13, and 15. To induce connection switching.

Here, the state in which the mobile communication terminal 100 is connected to the roaming induced FA cell is the state in which the mobile communication terminal 100 has completed the position registration in the roaming induced FA cell or the roaming induced FA cell is selected, but the position registration is still It is not executed.

In addition, the wireless network controller 23 sets a connection switching condition so that the mobile communication terminal 100 which has switched to a general FA cell does not reconnect to a roaming induced FA cell of another layer (Inter). It sets and transmits it to the corresponding cell of the induction node B 17 or the plurality of general node Bs 11, 13, and 15.

In addition, the wireless network controller 23 switches the access so that the mobile communication terminal 100 which has performed access switching to a general FA cell can switch access to another general FA cell of the same layer (Intra). The induction condition is set and transmitted to the corresponding cell of the induction node B 17 or the plurality of general node Bs 11, 13, and 15.

On the other hand, the method for controlling the cell-to-cell connection switching of the mobile communication terminal 100 will be described as divided into two cases as follows.

First, as a method of controlling the mobile communication terminal 100 to switch access from a roaming induced FA cell to a general FA cell, the wireless network controller 23 uses a different layer from the roaming induced FA cell currently selected by the mobile communication terminal 100. A first access switching inducing condition and a plurality of first access switching inducing conditions for inducing network discovery of the mobile communication terminal 100 to switch to one of a plurality of general FA cells (general FA cell 1, general FA cell 2, ...) The second access switching inducing condition is set such that the power strength of each of the general FA cells is greater than that of the roaming induced FA cell.

(1)

Q _qulameas ≤ S _intersearch + Q _qualmin = A-20 = 0 [㏈]

From here,

* Q _qulameas = Measured network quality value (signal-to-noise ratio (Ec / No)

* S _intersearch = Threshold value for frequency measurement of other Inter

* Q _qualmin = Minimum required quality value in a cell

Referring to Equation 1, the first access switching induction condition is Q _qulameas measured by the mobile communication terminal 100 in a serving cell (roaming induced FA cell in which the mobile communication terminal 100 is located) S _{intersearch whose value is} received via a System Information Block Parameter (hereinafter referred to as a 'SIB parameter') 3 Value and Q _qualmin By setting the value equal to or smaller than the sum of the values at all times to induce the network search of the mobile communication terminal 100, Q _qulameas S _intersearch so that the value approaches 0 [㏈] It is to set the value (A in Equation 1). Here, SIB 3 includes information necessary for cell redirection and cell reconnection.

For example, Q _qualmin Assuming that the value is -20 [㏈] set in the current commercial network, if you set the S _intersearch value to 20 [㏈], Q _qulameas The value can always be close to 0 [k].

(2)

Rs = Qmeas, s + Qhyst _s = Qmeas, s + B ... (1)

Rn = Qmeas, n + Qoffset _{s , n} = Qmeas, n + C ... (2)

* Qmeas = quality value

* Qhyst = Hysteresis value

* Qoffset = offset value between two cells

Referring to Equation 2, the second access switching inducing condition is the SIB parameter such that the cell access switching order of the plurality of general FA cells, which are neighbor cells, is always higher than the ranking of the roaming induced FA cell, which is the serving cell. The Rn value of the normal FA cell is maximized and the Rs value of the roaming induced FA cell is minimized. That is, the Qhyst _s value (B) of the roaming induced FA cell and the general FA cell of the SIB parameter such that the Rn value is always greater than the Rs value. By setting the Qoffset _{s , n} value (C), the mobile communication terminal 100 is induced to switch to the normal FA cell.

For example, the Qhyst _s value (B) of roaming induced FA cells is set to 0 [dB], and that of a typical FA cell. The Qoffset _{s , n} value (C) is set to -14.

Node Bs (11, 13, 15, 17; both general Node B and induced Node B) receive a control signal including a first connection induction condition and a second connection induction condition received from the radio network controller 23; After transmitting to the cell area, the mobile communication terminal 100 selects a roaming induced FA cell so that the mobile communication terminal 100 switches to a general FA cell of another layer.

Secondly, as a method of controlling the mobile communication terminal 100 connected to the general FA cell so as not to reconnect to a roaming induced FA cell of another layer, the wireless network controller 23 is in an idle state. Set the transfer switching restriction condition so that the 100 does not transfer from the currently connected general FA cell to the roaming induced FA cell of another layer, and establish a connection transfer induction condition such that connection transfer between other general FA cells of the same layer is possible. Set it.

(3)

Q _qulameas ≤ S _intersearch + Q _qualmin = D-20 = -20 [㏈] ... (1)

Q _qulameas ≤ S _intrasearch + Q _qualmin = E-20 = -4 [㏈] ... (2)

From here,

* S _intrasearch = Threshold value for frequency measurement of the same layer

Referring to Equation 3 (1), the access switching constraint is a connection switching from the general FA cell in which the idle mobile communication terminal 100 connected to the general FA cell to the roaming induced FA cell of another layer. S _intersearch of the general FA cell so that the Q _qulameas value of the general FA cell is less than or equal to -20 [㏈] among the SIB parameters. By setting the value (D), eventually, the Q _qulameas measured by the mobile communication terminal 100 in a general FA cell Only when the value is lower than -20 [㏈], network search for connection switching is performed.

For example, Q _qualmin as commonly applied in commercial _networks If you set the value to -20 [㏈], S _intersearch Set the value to zero.

Referring to Equation 3 (2), the access switching induction condition is a condition that allows the mobile communication terminal 100 in the idle state connected to the general FA cell to switch to another general FA cell of the same layer. , S _intrasearch of the general FA cell so that the Q _qulameas value of the general FA cell is less than or equal to -4 [㏈] among the SIB parameters Q _qulameas measured by the mobile communication terminal 100 in the general FA cell by setting the value (E). If the value is less than -4 [㏈], the network search for access switching is performed.

For example, Q _qualmin as commonly applied in commercial _networks If you set the value to -20 [㏈], S _intrasearch Set the value to 16.

In addition, the wireless network controller 23 performs a CIO (Cell) of roaming induced FA cells of the SIB parameters so that the mobile communication terminal in a traffic state does not perform handover from the currently connected general FA cell to the roaming induced FA cell of another layer. Set the handover constraint by adjusting the Individual Offset) value to the maximum value (for example, 10 [db]) of the preset range.

Here, the CIO value is a power offset value unique to each cell, and means an offset value for a neighbor cell for handover in a traffic state.

When the Node Bs 11, 13, 15, and 17 receive the connection switching constraint, the handover constraint, and the connection switching induction condition from the radio network controller 23, the node Bs 11, 13, 15, and 17 transmit the control signals including the same to the corresponding cell area. , Limiting or inducing connection switching between cells of the mobile communication terminal 100.

3 is a flowchart illustrating an embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention, in which a mobile communication terminal that selects a roaming induced FA cell controls to switch access from a roaming induced FA cell to a general FA cell; The case will be described as an example.

The radio network controller 23 may select one of a plurality of general FA cells (general FA cell 1, general FA cell 2, ...) of another layer from the roaming induced FA cell currently selected by the mobile communication terminal 100. Set the first access switching induction condition for inducing network discovery of the mobile communication terminal 100 to switch access and the second access switching induction condition such that the power strength of each of the plurality of general FA cells is greater than that of the roaming induction FA cell. (S101).

Herein, the first access switching induction condition is Q _{qulameas, which is} a network quality value measured by the mobile communication terminal 100 in a roaming induction FA cell. Value is S _intersearch among SIB parameters Value and Q _qualmin By setting the value equal to or smaller than the sum of the values at all times to induce the network search of the mobile communication terminal 100, Q _qulameas S _intersearch so that the value approaches 0 [㏈] Is to set the value.

In addition, the second ACCD condition is to maximize the Rn value of the general FA cell among the SIB parameters so that the cell ATP priority of the plurality of general FA cells as neighboring cells is always higher than that of the roaming induced FA cell as the serving cell. The Rs value of the induced FA cell is minimized. That is, the wireless network controller 23 determines the Qhyst _s value of the roaming induced FA cell and the general FA cell so that the Rn value of the SIB parameter is always greater than the Rs value. Set the Qoffset _{s , n} values.

Subsequently, the radio network controller 23 transmits the first access switching induction condition and the second access switching induction condition set in step S101 to the node B (11, 13, 15, 17) for transmission to the corresponding cell area ( S103).

Although not shown, the Node Bs 11, 13, 15, and 17 may transmit a control signal including a connection induction condition (a first connection induction condition and a second connection induction condition) received from the radio network controller 23. Sends to the cell area.

As a result, the mobile communication terminal 100 which is connected to the roaming induced FA cell (Camp On) is to perform the connection selection (Reselection) to any one of the plurality of general FA cells.

4 is a flowchart illustrating another embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention, in which a mobile communication terminal switched from a roaming induction FA cell to a general FA cell returns to a roaming induction FA cell of another layer. A case of controlling not to change the connection will be described as an example.

The wireless network controller 23 is a connection switching condition that prevents the mobile communication terminal 100 in idle state from being connected to the roaming induced FA cell of another layer from the currently connected general FA cell and other general FA of the same layer. A connection switching induction condition is set to enable connection switching to a cell (S201).

Here, the access switching constraint is a Q _qulameas of the general FA cell among the SIB parameters such that the idle mobile terminal 100 connected to the general FA cell does not switch from the current FA to the roaming induced FA cell of another layer. S _intersearch of a normal FA cell so that the value is less than or equal to -20 [㏈] Is to set the value.

In addition, the access switching induction condition is a condition that allows the mobile communication terminal 100 in the idle state connected to the general FA cell to switch to another general FA cell of the same layer, the Q _qulameas value of the general FA cell of the SIB parameters It is to set the S _intrasearch value of the general FA cell to be less than or equal to -4 [㏈].

Subsequently, the radio network controller 23 transmits the access switching restriction condition and the connection switching induction condition set in step S201 to the node B (11, 13, 15, 17) to transmit to the cell area (S203).

Although not shown, when the Node Bs 11, 13, 15, and 17 receive the connection switching restriction condition and the connection switching induction condition from the radio network controller 23, the Node Bs 11, 13, 15, and 17 transmit control signals including the same to the corresponding cell area. Limit or induce connection switching between cells of the mobile communication terminal 100.

5 is a flowchart illustrating another embodiment of a roaming control method in an asynchronous mobile communication system according to the present invention, in which a mobile communication terminal which is switched from a roaming induced FA cell to a general FA cell roams at another layer in a traffic state; An example of controlling the handover to the induced FA cell will be described.

The radio network controller 23 sets the CIO (Cell Individual Offset) value of the roaming induced FA cell among the SIB parameters so that the mobile communication terminal in the traffic state does not perform handover from the currently connected general FA cell to the roaming induced FA cell of another layer. The handover constraint is set by adjusting to a maximum value (for example, 10 [db]) among a range of preset values (S301).

Here, the CIO value is a power offset value unique to each cell, and means an offset value for a neighbor cell for handover in a traffic state.

Subsequently, the radio network controller 23 transmits the handover restriction condition set in step S301 to the node Bs 11, 13, 15, and 17 to transmit it to the corresponding cell area (S303).

Although not shown, when the Node Bs 11, 13, 15, and 17 receive a handover restriction condition from the radio network controller 23, the Node Bs 11, 13, 15, and 17 transmit a control signal including the same to the cell area, and the mobile communication terminal 100. It is induced not to perform handover to the roaming FA cell of another layer.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

As described above, the roaming control method and the asynchronous mobile communication system for the asynchronous mobile communication system of the present invention are mobile communication terminals in an asynchronous mobile communication system irrespective of whether the mobile communication terminal supports network directed handover. There is an advantage that can effectively control the connection switching.

Another embodiment of the present invention can set the system information block parameter of a specific cell area of an asynchronous mobile communication system so that the connection switching procedure of the mobile communication terminal can be performed quickly.

Claims (16)

An asynchronous mobile communication system for controlling roaming, A node B is connected to a node B including a plurality of general node Bs and an induction node B to control the node B, and the plurality of general frequency allocations of different layers are allocated from a roaming frequency allocation cell (FA) selected by the mobile communication terminal. A first connection switching induction condition for inducing network discovery of the mobile communication terminal to switch to one of the cells and a second power such that the power strength of each of the plurality of general frequency allocation cells is greater than that of the roaming induced frequency allocation cell; A wireless network controller for setting a connection switching induction condition; And Node B which transmits a control signal including a first access switching induction condition and a second access switching induction condition received from the radio network controller to a corresponding cell area so that the mobile communication terminal switches to a general frequency allocation cell of another layer. ; Asynchronous mobile communication system comprising a. The method of claim 1, The first connection switching inducing condition is, In order to measure frequency of another layer (Inter) such that the network quality value (Q _qulameas ) measured by the mobile communication terminal in the roaming induced frequency allocation cell among system information block parameters is less than or equal to 0 Hz. An asynchronous mobile communication system characterized by setting a threshold value (S _intersearch ). The method of claim 1, The second connection switching induction condition is, Among the system information block parameters, the hysteresis value (Qhyst _s ) of the roaming induced frequency allocation cell such that the cell switching priority value (Rn) of the general frequency allocation cell is always higher than the roaming frequency allocation cell switching rank value (Rs). ) And the common frequency allocation cell Asynchronous mobile communication system, characterized in that for setting the offset value (Qoffset _{s, n} ). An asynchronous mobile communication system for controlling roaming, A node B which is connected to a node B including a plurality of general node B and an induction node B, controls the node B, and has a different layer from a frequency frequency allocation (FA) cell to which a mobile communication terminal in idle state is currently connected. A connection switching condition that prevents the switching to the roaming induced frequency allocation cell of the mobile station; a connection switching induction condition that enables the switching to the general frequency allocation cell of the same layer; A radio network controller configured to set any one of handover constraints not to perform handover to a roaming induced frequency allocation cell of a layer; And A node B connected to the wireless network controller and transmitting a control signal including the connection switching restriction condition, a handover restriction condition, or a connection switching induction condition from the wireless network controller to a corresponding cell area; Asynchronous mobile communication system comprising a. 5. The method of claim 4, The connection switching constraint is, Network quality value (Q _qulameas ) measured by the mobile communication terminal in the general frequency allocation cell of the system information block parameters so that an idle mobile terminal connected to the general frequency allocation cell does not switch to a roaming induced frequency allocation cell of another layer. And a threshold value (S _intersearch ) for frequency measurement of another layer (Inter) of a general frequency allocation cell so as to be less than or equal to -20 Hz. 5. The method of claim 4, The connection switching induction condition, General frequency so that Q _qulameas value of general frequency allocation cell is _-4㏈ less than or equal to among general information allocation parameters so that idle mobile communication terminal connected to general frequency allocation cell can switch to other general frequency allocation cell of same layer. A threshold mobile communication system for setting a threshold value (S _intrasearch ) for frequency measurement of the same layer (Intra) of the allocation cell. 5. The method of claim 4, The handover constraint is, In order to prevent a mobile communication terminal in a traffic state connected to a general frequency allocation cell from performing a handover to another layer roaming induced frequency allocation cell, a cell individual offset (CIO) value, which is a power offset value of a roaming induced frequency allocation cell, of the system information block parameters is preliminary. Asynchronous mobile communication system, characterized in that for setting the maximum value of the set range. Roaming control in an asynchronous mobile communication system having a plurality of general Node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel that transmits a control signal with a power intensity greater than another channel among the plurality of channels. As a method, a) a first access switching inducing condition for inducing a network search of the mobile communication terminal so that a mobile communication terminal selecting a roaming frequency frequency (FA) cell switches to one of a plurality of general frequency allocation cells of another layer; And setting a second access switching inducing condition in which the power strength of each of the plurality of general frequency allocation cells is greater than the power strength of the roaming induction frequency allocation cell. And b) transmitting a control signal including the first access switching inducing condition and the second access switching inducing condition to a corresponding cell area; Roaming control method in an asynchronous mobile communication system comprising a. 9. The method of claim 8, The first connection switching inducing condition is, In order to measure frequency of another layer (Inter) such that the network quality value (Q _qulameas ) measured by the mobile communication terminal in the roaming induced frequency allocation cell among system information block parameters is less than or equal to 0 Hz. A roaming control method in an asynchronous mobile communication system, characterized by setting a threshold value (S _intersearch ). 9. The method of claim 8, The second connection switching induction condition is, Among the system information block parameters, the hysteresis value (Qhyst _s ) of the roaming induced frequency allocation cell such that the cell switching priority value (Rn) of the general frequency allocation cell is always higher than the roaming frequency allocation cell switching rank value (Rs). ) And the common frequency allocation cell Roaming control method in an asynchronous mobile communication system characterized by setting the offset value (Qoffset _{s, n} ). Roaming control in an asynchronous mobile communication system having a plurality of general Node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel that transmits a control signal with a power intensity greater than another channel among the plurality of channels. As a method, a) Roaming induction frequency of a different layer from a general frequency allocation cell to which a mobile communication terminal in idle state, which is switched from a roaming frequency allocation cell to one of a plurality of general frequency allocation cells, is currently connected Setting an access switching restriction condition so as not to switch back to the assigned cell; And b) transmitting a control signal including a connection change restriction condition set in step a) to a corresponding cell area; Roaming control method in an asynchronous mobile communication system comprising a. 12. The method of claim 11, And transmitting, by the mobile communication terminal, a control signal including a connection switching induction condition for enabling connection switching from a currently connected general frequency allocation cell to another general frequency allocation cell of the same layer to a corresponding cell area. Roaming control method in an asynchronous mobile communication system. The method of claim 12, The connection switching induction condition, Q _qulameas (Q _qulameas) measured by the mobile communication terminal in the general frequency allocation cell of the system information block parameters so that the idle mobile terminal connected to the general frequency allocation cell can be switched to another general frequency allocation cell of the same layer And a threshold value (S _intrasearch ) for frequency measurement of the same layer (Intra) of a general frequency allocation cell so that)) is less than or equal to -4 kHz. 14. The method according to any one of claims 11 to 13, The connection switching constraint is, General frequency allocation so that the Q _qulameas value of the general frequency allocation cell of the system information block parameter is less than or equal to -20 Hz so that an idle mobile terminal connected to the general frequency allocation cell does not switch to another layer roaming induced frequency allocation cell. Roaming control method in an asynchronous mobile communication system, characterized in that for setting the threshold value (S _intersearch ) for measuring the frequency of the other layer (Inter) of the cell. Roaming control in an asynchronous mobile communication system having a plurality of general Node Bs, a radio network controller, a switch, and an induction node B including at least one roaming channel that transmits a control signal with a power intensity greater than another channel among the plurality of channels. As a method, a) Roaming induction frequency of another layer from a general frequency allocation cell to which a mobile communication terminal in a traffic state which is switched from a roaming frequency allocation cell (FA) to one of a plurality of general frequency allocation cells is currently connected Setting a handover constraint to prevent handover to the assigned cell; And b) transmitting a control signal including the handover constraint set in step a) to the cell area; Roaming control method in an asynchronous mobile communication system comprising a. 16. The method of claim 15, The handover constraint is, In order to prevent a mobile communication terminal in a traffic state connected to a general frequency allocation cell from performing a handover to another layer roaming induced frequency allocation cell, a cell individual offset (CIO) value, which is a power offset value of a roaming induced frequency allocation cell, of the system information block parameters is preliminary. Roaming control method in an asynchronous mobile communication system, characterized in that the setting to the maximum value of the set range.

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