JP5205518B2 - Location update method in wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system, and more particularly to a location update method in a radio communication system including femtocells.

  First, an idle mode and a paging group of a mobile terminal according to an embodiment of the present invention will be described.

  The broadband wireless access system supports an idle mode in order to minimize power consumption of the mobile terminal. The idle mode is a state in which a mobile terminal can periodically receive a downlink broadcast traffic message without registering the mobile terminal in a specific base station when moving in a radio link environment composed of multiple base stations. Say.

  In the idle mode, the mobile terminal does not need to perform a handoff procedure when moving between base stations included in the same paging area. Accordingly, since the mobile terminal does not need to transmit uplink information for the handoff procedure, power consumption can be reduced.

  If the mobile terminal does not receive traffic from the base station for a certain period of time, the mobile terminal can transition to an idle mode in order to save power. In the idle mode, the mobile terminal receives a broadcast message (eg, a paging message) from the base station in an available section, and determines whether to transition to a normal mode or remain in the idle mode. Can do. Further, in the idle mode, the mobile terminal can inform the paging controller of its own position by updating the position.

  The idle mode can bring good results to the mobile terminal by removing the active request for handover and the general operation request. The idle mode limits the activity of the mobile terminal to scan in discrete periods, thus allowing the mobile terminal to save power and operational resources.

  In addition, the idle mode provides a simple and appropriate method for the mobile terminal to notify the downlink traffic that is pending to the mobile terminal, and the radio interface and network handover from the inactive mobile terminal. By removing (HandOver, HO) traffic, good results can be achieved for the network and the base station.

  Paging means a function of grasping the position of a corresponding mobile terminal (for example, to which base station or switching station a mobile device belongs) when an incoming call occurs in mobile communication. A large number of base stations supporting the idle mode can belong to a specific paging group to form a paging area.

  Here, the paging group represents a logical group. The purpose of the paging group is to provide a contiguous range area that can be paged on the downlink (DownLink, DL) when there is traffic targeting the mobile terminal. The paging group should satisfy the condition that the specific terminal must be large enough to allow most of the time in the same paging group to stay and small enough to maintain the paging load at an appropriate level. .

  FIG. 1 is a diagram illustrating an example of a paging group including a large number of base stations.

  FIG. 1 shows four paging groups defined on multiple base stations located in a hexagonal lattice. One base station can be included in one or more paging groups.

  A paging group is defined in the management system. In a paging group, a paging group-execution backbone message can be used. The paging controller can manage a list of mobile terminals in an idle mode using a backbone network message (paging public message), and can start paging of the mobile terminals for all base stations belonging to the paging group.

  A paging group can include one or more base stations, and a base station can be included in one or more paging groups. Paging groups can be defined in the management system. The paging group can use a paging group-execute backbone network message. In addition, the paging controller can manage a list of mobile terminals in idle mode using other backbone messages (paging known messages), and can start paging of mobile terminals for all base stations belonging to the paging group. .

  When the mobile terminal requests the base station to switch to the idle mode, the base station can switch the mobile terminal to the idle mode by transmitting its own paging group ID to the mobile terminal.

  Next, a paging procedure and a position update method according to the related art will be described.

  When the paging controller receives an incoming call or packet for the mobile terminal while the mobile terminal is in idle mode, the paging controller transmits the paging message to all base stations in the paging group and receives the paging message. The base station broadcasts a paging advertisement message to a mobile terminal managed by the base station. The mobile terminal receives a paging advertisement message transmitted by the base station in an available section, and determines whether to transition to the normal mode or remain in the idle mode. That is, when the paging controller pages the mobile terminal, the mobile terminal can enter the normal mode and communicate with the serving base station.

  When the location update condition is satisfied, the mobile terminal in the idle mode updates the location. Location update conditions include paging group location update, timer-based location update, power down location update, and the like.

  The paging group position update condition is as follows. When the mobile terminal leaves the area of the paging group to which it belongs and enters the area of another paging group, the mobile terminal performs location update. The paging group location update condition means that the mobile terminal performs location update when the location update timer expires. The power down position update means that the position update is performed before the mobile terminal turns off the power.

  That is, when a mobile terminal moves from one paging group to another paging group, the mobile terminal transmits a ranging request (RNG-REQ) message to the target base station in order to update the location. The target base station that has received the ranging request message transmits a ranging response (RNG-RSP) message to the mobile terminal. At this time, the target base station includes the paging group identifier (PG_ID) in the ranging response message. Then, the target base station informs the paging controller of the new location of the mobile terminal.

  In recent years, a technique related to a femto cell base station for supporting indoor or shaded areas where a macro cell cannot support has been defined. By femtocell is meant a low power, small cell area managed by an indoor base station designed for use in a home and / or small office environment. The femtocell is used as a meaning substantially similar to a picocell, but is used as a meaning having a more advanced function of the picocell. The femtocell base station is a small cellular base station connected to a broadband router, and the voice and data of a 3rd generation (3G) system as well as an existing 2nd generation (2G) system are converted into a digital subscriber line, It can be connected to the backbone network of a mobile communication company through a DSL) link or the like.

  The femtocell base station can cover indoor or shaded areas that cannot be covered by the macro base station, and can support a high data transmission rate. The femtocell base station may be installed in the macro cell in an overlay form, or may be installed in a non-overlay form in an area not covered by the macro base station.

  Femtocell base stations are classified into two types. One type is a closed subscriber group (CSG) femtocell base station, and the other type is an OSG (open subscriber group) femtocell base station. A CSG femtocell base station is a base station that groups mobile terminals accessible to itself, gives a CSG identifier (ID), and can connect only to the mobile terminals to which the CSG ID is given. The OSG femtocell base station is a base station to which any terminal can connect.

  The operation mode of the CSG base station includes an open connection mode, a closed access mode, and a hybrid access mode.

  All users (for example, all terminals) can connect to the femtocell base station in the open connection mode, and the mobile terminal can receive the CSG ID received from the femtocell base station and the user CSG list (User CSG) of the mobile terminal. (list) and the initial approach to the femtocell base station. The user CSG list is a CSG ID list of femtocells to which the mobile terminal can connect, and the mobile terminal can manage the user CSG list (or CSG ID list).

  The femtocell base station in the closed connection mode is a base station to which only a specific user (or a specific mobile terminal) can connect, and the mobile terminal uses the CSG ID received from the femtocell base station and the user CSG list of the mobile terminal. In comparison, the initial entry to the femtocell base station is performed only when the received CSG ID is in the user CSG list of the mobile terminal. The hybrid connection mode is a mode that can be operated in either the open connection mode or the closed connection mode.

  The merit of such a femtocell will be described as follows.

  In recent years, a research report that femtocells can be an exposure agent that promotes 3G penetration and expands indoor coverage has attracted attention. In 2012, the number of femtocell base station users around the world will increase to about 102 million, and the installation of APs (Access Points) as base stations is expected to reach 62 million. The femtocell can enhance cell coverage and improve voice service quality. Mobile carriers are also expected to make it easier for subscribers to become familiar with 3G technology by providing various data services via femtocells.

  That is, a communication system using femtocells can increase cell coverage, can construct an infrastructure at a lower cost than conventional base stations, and can accelerate FMC (Fixed Mobile Convergence).

  One or more femtocell base stations can be grouped by specific service or region to form a femtocell group. For example, a femto cell group that permits connection only to a specific mobile terminal can be referred to as a closed subscriber group (CSG). The femtocell base station (FBS) confirms the CSG identifier (CSG ID) of the mobile terminal and can grant a connection only to the mobile terminal that has joined the CSG.

  FIG. 2 is a diagram illustrating an example of a femto cell arrangement structure in the overlay network.

  Referring to FIG. 2, the backbone network of the femtocell base station is directly connected to an ISP (Internet Service Provider) network connected by wire, and a femtocell gateway (femto cell gateway) is connected to a connection point between the backbone network and the ISP network. gateway, FGW) can exist. The FGW can be used as a connection point for communication with a macro cell (or macro) base station (MBS).

  The FGW may be directly connected to the femtocell base station, and may be located between the core network and the ISP network as a server concept integrated for each ISP. In addition, the system can guarantee communication with a macro cell (or macro) base station through the CNS GW or the ASN GW regardless of the position of the FGW. In the overlay network, the MBS can transmit and receive or store part or all of information for the FBS.

  When the femtocell base station configuration is completed, the MBS can recognize information including FBS location information. For this reason, the MBS can directly communicate with the FBS through the radio interface.

  At this time, a macro base station including a home femto base station (Home Femto BS) and a closed subscriber group (CSG) femto base station of a mobile terminal can be referred to as an overlay macro base station (Overlay Macro BS).

  FIG. 3 is a diagram illustrating an example of a femto cell arrangement structure in a non-overlay network.

  In a non-overlay structure, when there are a large number of users temporarily at the boundary of the macro base station (MBS), a femto base station (FBS) can be installed at the boundary of the macro cell. In this case, the MBS may not be able to store all information for the FBS. At this time, the FGW can serve as a connection point that can communicate with the MBS in the same manner as the overlay structure.

  A femtocell base station has a small coverage. For this reason, if the location update is performed every time the femtocell base station leaves the femtocell region, the number of location updates excessively increases.

  As described above, when a mobile terminal in an idle mode moves from a femto cell to a macro cell, moves from a macro cell to a femto cell, or moves from a femto cell to a femto cell with the recent appearance of a femto cell. , Need location update.

  Therefore, an object of the present invention is to efficiently update a location when a mobile terminal in an idle mode moves from a femto cell to a macro cell, moves from a macro cell to a femto cell, or moves from a femto cell to a femto cell. Provide a way that can be done.

  The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are based on the following description and are based on ordinary knowledge in the technical field to which the present invention belongs. It will be clear to those who have

  An object of the present invention is a method for performing location update in a mobile terminal of a wireless communication system including a femtocell, wherein the paging group identifier (ID) of a first femtocell base station in which the mobile terminal stays and the first Receiving a deregistration command (DREG-CMD) message including a paging group ID of a macro base station including a femtocell base station, wherein the mobile terminal receives the first femtocell from the first femtocell region; Starting a location update delay timer while moving to a second femto cell region having a paging group ID different from the paging group ID of the current location, and updating the location based on the operation of the location update delay timer I do Floor, can be accomplished by providing a location update method comprising.

  In another aspect of the present invention, a method for performing location update in a mobile terminal of a wireless communication system including a femto cell, including a paging group identifier (ID) of a first femto cell base station in which the mobile terminal stays. Receiving a deregistration command (DREG-CMD) message, while the mobile terminal moves from the first femto cell region to the second femto cell region, a location update delay timer (location update delay); timer) and performing a location update based on the operation of the location update delay timer, and the paging group ID of the first femtocell is the same as the paging group ID of the second femtocell. Yes, the first femtocell Closed subscriber group (closed subscriber group, CSG) different from the closed subscriber group of the second femtocell, location update method is provided.

  In still another aspect of the present invention, a method for performing location update in a mobile terminal of a wireless communication system including a femto cell, the paging group identifier (ID) of a first femto cell base station in which the mobile terminal stays, and Receiving a deregistration command (DREG-CMD) message including a paging group ID of a macro base station including the first femtocell base station, wherein the mobile terminal receives the macro base from the area of the first femtocell; A location update method is provided that includes starting a location update delay timer while moving to a station area and performing a location update based on the operation of the location update delay timer. .

  In still another aspect of the present invention, a method for performing location update in a femtocell environment, wherein the deregistration includes a first paging group identifier (ID) of a first region and a second paging group ID of a second region from a base station. Receiving a deregistration command (DREG-CMD) message, setting a first timer for the mobile terminal to perform the location update, and moving the mobile terminal from the first region to the second region And a step of setting a second timer for the mobile terminal to delay the position update for a predetermined period of time.

  When the second timer expires, the mobile terminal may further include performing the location update in the second area.

  If the first timer expires before the second timer expires, the method may further include performing the position update in the second area.

  The mobile terminal may return to the first area before the second timer expires, and if the first timer has not expired, the mobile terminal may not further perform the location update. .

  The first area may be a macro cell area, the first paging group ID may be a macro paging group ID, the second area may be a femto cell area, and the second paging group ID may be a femto paging group ID. .

  The first area may be a femto cell area, the first paging group ID may be a femto paging group ID, the second area may be a macro cell area, and the second paging group identifier may be a macro paging group ID. It ’s fine.

  The first paging group ID and the second paging group ID may be correlated with each other.

  In still another aspect of the present invention, a method for performing location update in a femtocell environment, the step of receiving a deregistration command message from a mobile terminal, and the mobile terminal receiving a first paging group identifier (ID) of a first region And a deregistration command including a second paging group ID of the second area, and when the mobile terminal moves from the first area to the second area, the location update is performed in a predetermined period. A location update method is provided that sets a first timer for delaying.

  The mobile terminal may further include performing the location update in the second area when the first timer expires.

  The first area may be a macro cell area, the first paging group ID may be a macro paging group ID, the second area may be a femto cell area, and the second paging group ID may be a femto paging group identifier. .

  The first area may be a femto cell area, the first paging group ID may be a femto paging group ID, the second area may be a macro cell area, and the second paging group ID may be a macro paging group ID. It ’s fine.

  The first paging group ID and the second paging group ID may have a correlation with each other.

  Next, a method and apparatus for performing and supporting the idle mode in the wireless connection system will be described.

  In still another aspect of the present invention, the mobile terminal performs an idle mode operation, wherein the mobile terminal transmits an idle mode request message requesting entry into the idle mode to the first base station. Receiving an idle mode command message including one paging information, transmitting a ranging request (RNG-REQ) message to the second base station to perform location update with the second base station, and the second base Receiving a ranging response (RNG-RSP) message including second paging information from a station, wherein one or more of the first paging information and the second paging information are parameters for two-stage paging. A method for performing an idle mode operation is provided.

  As a first embodiment, the parameter for performing the two-stage paging is at least one of a first paging offset, a second paging offset, a closed subscriber group (CSG) femto cell paging group ID, and a macro cell paging group ID. Can be included.

  The first embodiment may further include monitoring a paging message with the first paging offset.

  The first embodiment may further include monitoring a paging message at the second paging offset.

  As a first embodiment, the first base station may be a macro base station, and the second base station may be a closed subscriber group (CSG) femto base station. Of course, if necessary, the first base station can be a CSG femto base station, and the second base station can be a macro base station.

  As a first embodiment, each of the idle mode request message and the idle mode command message may further include a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area.

  As a first embodiment, the ranging request message (RNG-REQ) and the ranging response (RNG-RSP) message are timer parameters indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area. Can further be included.

  In still another aspect of the present invention, there is provided a method for supporting an operation of an idle mode of a mobile terminal, wherein a first base station receives an idle mode request message requesting entry of the idle mode from the mobile terminal, Transmitting an idle mode command message including first paging information from one base station to the mobile terminal, receiving a ranging request message for performing location update from the mobile terminal at a second base station, and the second Transmitting a ranging response message including second paging information from a base station to the mobile terminal, wherein at least one of the first paging information and the second paging information is a parameter for two-stage paging. A method for supporting idle mode operation is provided.

  As a second embodiment, the two-stage paging parameter includes at least one of a first paging offset, a second paging offset, a closed subscriber group (CSG) femto cell paging group ID, and a macro cell paging group ID. it can.

  As a second embodiment, the first base station may further include transmitting a paging message to the mobile terminal at the first paging offset.

  As a second embodiment, the second base station may further include transmitting a paging message to the mobile terminal at the second paging offset.

  As a second embodiment, each of the ranging request message and the ranging response message may further include a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area.

  As a second embodiment, the first base station may be a macro base station, and the second base station may be a CSG femto base station. Of course, if necessary, the first base station can be a CSG femto base station, and the second base station can be a macro base station.

  In still another aspect of the present invention, the mobile terminal performs an idle mode operation, and includes an antenna for transmitting and receiving a message, a transmission module for controlling the antenna to transmit the message, and controlling the antenna for the message. Receiving module, a memory for storing information related to the idle mode operation, and the transmission module, the receiving module and a processor for controlling the memory, wherein the processor includes the transmitting module and the receiving module. Controlling, transmitting an idle mode request message requesting entry into an idle mode to the first base station, receiving an idle mode command message including the first paging information from the first base station, and positioning to the second base station A ranging request message is sent to the second base station for updating. And receiving a ranging response message including second paging information from the second base station, wherein at least one of the first paging information and the second paging information includes a parameter for two-stage paging. A mobile terminal is provided.

  As a third embodiment, the parameters for the two-stage paging include at least one of a first paging offset, a second paging offset, a closed subscriber group (CSG) femto cell paging group ID, and a macro cell paging group ID. Can be included.

  As a third embodiment, the processor may monitor a paging message at one or more of the first paging offset and the second paging offset.

  As a third embodiment, the first base station may be a macro base station, and the second base station may be a closed subscriber group (CSG) femto base station. Of course, if necessary, the first base station can be a CSG femto base station, and the second base station can be a macro base station.

  Each of the idle mode request message and the idle mode command message may further include a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area.

  The above embodiments are only a part of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be used by those having ordinary knowledge in the art. It will be understood and derived from the detailed description of the invention set forth below.

  The embodiment of the present invention has the following effects.

  First, the embodiment of the present invention can reduce the number of times the location of the mobile terminal is updated.

  Second, the embodiment of the present invention can reduce the overhead due to the paging message transmission of the base station.

  Third, the embodiment of the present invention efficiently performs location update when a mobile terminal moves from a femto cell to a macro cell, moves from a macro cell to a femto cell, or moves from a femto cell to a femto cell. be able to.

The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned are clearly understood by those having ordinary knowledge in the technical field to which the present invention belongs from the following description. Will be done.
(Item 1)
A method for performing location update in a mobile terminal of a wireless communication system including a femtocell,
Deregistration command (DREG-CMD) including a paging group identifier (ID) of a first femtocell base station in which the mobile terminal stays and a paging group ID of a macro base station including the first femtocell base station Receiving a message;
While the mobile terminal moves from the first femtocell region to a second femtocell region having a paging group ID different from the paging group ID of the first femtocell, a location update delay timer is used. Starting the
Performing a position update based on the operation of the position update delay timer;
A location update method.
(Item 2)
The second femtocell is included in the area of the macro base station,
The location update method according to item 1, wherein the step of performing location update includes the step of performing location update to the macro base station when the location update delay timer expires.
(Item 3)
Performing the location update includes performing the location update if a location update timer for a timer-based location update expires before the location update delay timer expires. The location update method described.
(Item 4)
The performing the location update includes the step of canceling the location update delay timer when the mobile terminal returns to the first femtocell area before the location update delay timer expires. Location update method.
(Item 5)
The step of performing the location update includes the step of performing the location update when the mobile terminal leaves the paging group area of the macro base station before the location update delay timer expires. Location update method.
(Item 6)
A method for performing location update in a mobile terminal of a wireless communication system including a femtocell,
Receiving a deregistration command (DREG-CMD) message including a paging group identifier (ID) of a first femtocell base station in which the mobile terminal stays;
Starting a location update delay timer while the mobile terminal moves from the first femtocell region to the second femtocell region;
Performing a position update based on the operation of the position update delay timer;
Including
The paging group ID of the first femtocell is the same as the paging group ID of the second femtocell, and the closed femtocell group (CSG) of the first femtocell and the closing of the second femtocell A location update method different from the subscriber group.
(Item 7)
7. The location updating method according to item 6, further comprising receiving a paging advertisement (MOB_PAG-ADV) message including a closed subscriber group (CSG) ID of the second femtocell from the second femtocell base station.
(Item 8)
7. The location update method according to item 6, wherein the location update step includes the step of immediately updating the location to the second femtocell when the location update delay timer expires.
(Item 9)
Performing the location update includes performing a location update when a location update timer for a timer-based location update expires before the location update delay timer expires. The location update method described.
(Item 10)
The step of performing the location update includes the step of canceling the location update delay timer when the mobile terminal returns to the first femtocell area before the location update delay timer expires. Location update method.
(Item 11)
A method for performing location update in a mobile terminal of a wireless communication system including a femtocell,
Deregistration command (DREG-CMD) including a paging group identifier (ID) of a first femtocell base station in which the mobile terminal stays and a paging group ID of a macro base station including the first femtocell base station Receiving a message;
Starting a location update delay timer while the mobile terminal moves from the first femtocell region to the macro base station region;
Performing a position update based on the operation of the position update delay timer;
A location update method.
(Item 12)
12. The location update method according to item 11, comprising the step of performing location update immediately when the mobile terminal leaves the area of the macro base station before the location update delay timer expires.
(Item 13)
Item 12. The location update method according to Item 11, wherein the paging group ID of the first femtocell base station and the paging group ID of the macro base station are the same.
(Item 14)
A method for updating location in a femtocell environment,
Receiving a deregistration command (DREG-CMD) message including a first paging group identifier (ID) of the first region and a second paging group ID of the second region from the base station;
Setting a first timer for the mobile terminal to perform the location update;
Moving the mobile terminal from the first region to the second region;
Setting a second timer for the mobile terminal to delay the location update in a predetermined period;
A location update method.
(Item 15)
15. The location update method according to item 14, wherein when the second timer expires, the mobile terminal performs the location update in the second area.
(Item 16)
15. The position update method according to item 14, wherein the position update is performed in the second area when the first timer expires before the second timer expires.
(Item 17)
Item 15. The location according to item 14, wherein the mobile terminal returns to the first area before the second timer expires, and the mobile terminal does not perform the location update unless the first timer expires. Update method.
(Item 18)
The first region is a macro cell region;
The first paging group ID is a macro paging group ID;
The second region is a femtocell region;
Item 15. The location update method according to Item 14, wherein the second paging group ID is a femto paging group ID.
(Item 19)
The first region is a femtocell region;
The first paging group ID is a femto paging group ID;
The second region is a macro cell region;
15. The location update method according to item 14, wherein the second paging group identifier is a macro paging group ID.
(Item 20)
The location update method according to item 14, wherein the first paging group ID and the second paging group ID are correlated with each other.
(Item 21)
A method for updating location in a femtocell environment,
Receiving a deregistration command message from the mobile terminal;
Transmitting a deregistration command including a first paging group identifier (ID) of a first area and a second paging group ID of a second area to the mobile terminal,
A location update method, wherein when the mobile terminal moves from the first area to the second area, a first timer for delaying the location update is set for a predetermined period.
(Item 22)
The location update method according to item 21, wherein when the first timer expires, the mobile terminal performs the location update in the second area.
(Item 23)
The first region is a macro cell region;
The first paging group ID is a macro paging group ID;
The second region is a femtocell region;
Item 22. The location update method according to Item 21, wherein the second paging group ID is a femto paging group identifier.
(Item 24)
The first region is a femtocell region;
The first paging group ID is a femto paging group ID;
The second region is a macro cell region;
Item 22. The location update method according to Item 21, wherein the second paging group ID is a macro paging group ID.
(Item 25)
The location update method according to item 21, wherein the first paging group ID and the second paging group ID are correlated with each other.
(Item 26)
A method in which a mobile terminal performs an idle mode operation,
Transmitting an idle mode request message requesting entry into idle mode to the first base station;
Receiving an idle mode command message including first paging information from the first base station;
Transmitting a ranging request (RNG-REQ) message to the second base station to perform location update with the second base station;
Receiving a ranging response (RNG-RSP) message including second paging information from the second base station,
One or more of the first paging information and the second paging information include a parameter for two-stage paging.
(Item 27)
The parameter for performing the two-stage paging is one or more of a first paging offset, a second paging offset, a closed subscriber group (CSG) femtocell paging group ID, and a macro cell paging group ID. How to perform the described idle mode operation.
(Item 28)
27. The method of performing an idle mode operation according to item 26, further comprising: monitoring a paging message at the first paging offset.
(Item 29)
27. The method of performing an idle mode operation according to item 26, further comprising: monitoring a paging message at the second paging offset.
(Item 30)
27. The idle mode operation execution method according to Item 26, wherein the first base station is a macro base station, and the second base station is a closed subscriber group (CSG) femto base station.
(Item 31)
27. The method of executing an idle mode operation according to item 26, wherein each idle mode command message further includes a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area.
(Item 32)
The ranging request message (RNG-REQ) and the ranging response (RNG-RSP) message further include a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area. A method of executing the idle mode operation described in 1.
(Item 33)
A method for supporting operation of an idle mode of a mobile terminal,
Receiving an idle mode request message for requesting entry into idle mode from the mobile terminal at the first base station;
Transmitting an idle mode command message including first paging information from the first base station to the mobile terminal;
Receiving a ranging request message for performing location update from the mobile terminal at a second base station;
Transmitting a ranging response message including second paging information from the second base station to the mobile terminal,
An idle mode operation support method, wherein one or more of the first paging information and the second paging information includes a parameter for two-stage paging.
(Item 34)
34. The idle mode of item 33, wherein the two-stage paging parameter is one or more of a first paging offset, a second paging offset, a closed subscriber group (CSG) femtocell paging group ID, and a macro cell paging group ID. Operation support method.
(Item 35)
34. The idle mode operation support method according to Item 33, further comprising transmitting a paging message to the mobile terminal at the first paging offset at the first base station.
(Item 36)
The idle mode operation support method according to Item 33, further comprising: transmitting a paging message to the mobile terminal at the second paging offset at the second base station.
(Item 37)
The idle mode operation support according to Item 33, wherein each of the ranging request message and the ranging response message further includes a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area. Method.
(Item 38)
A mobile terminal that operates in idle mode,
An antenna for sending and receiving messages;
A transmission module for controlling the antenna and transmitting the message;
A receiving module for controlling the antenna to receive the message;
A memory for storing information on the idle mode operation;
A processor that controls the transmission module, the receiving module, and the memory;
The processor controls the transmission module and the receiving module to transmit an idle mode request message requesting entry into an idle mode to the first base station, and includes an idle mode including first paging information from the first base station. Receiving a command message, transmitting a ranging request message to the second base station, and receiving a ranging response message including second paging information from the second base station in order to perform location update to the second base station; ,
One or more of the first paging information and the second paging information includes a parameter for two-stage paging.
(Item 39)
The parameter for the two-stage paging is one or more of a first paging offset, a second paging offset, a closed subscriber group (CSG) femtocell paging group ID, and a macro cell paging group ID. Mobile terminal.
(Item 40)
40. The mobile terminal of item 39, wherein the processor monitors a paging message at one or more of the first paging offset and the second paging offset.
(Item 41)
The first base station is a macro base station;
40. The mobile terminal of item 38, wherein the second base station is a closed subscriber group (CSG) femto base station.
(Item 42)
39. The mobile terminal according to item 38, wherein each of the idle mode request message and the idle mode command message further includes a timer parameter indicating a predetermined time during which the location update is not performed even when the mobile terminal leaves the paging area.

It is a figure which shows an example of the paging group which consists of many base stations. It is a figure which shows an example of the femtocell arrangement | positioning structure with an overlay network. It is a figure which shows an example of the femtocell arrangement structure in a non-overlay network. FIG. 3 is a diagram illustrating an idle mode entry process and a paging process of a mobile terminal in a wireless communication system according to an embodiment of the present invention. (A) is a diagram illustrating a mobile terminal moving from a home femto cell region to a macro cell region according to an embodiment of the present invention, and (b) is a diagram illustrating a mobile terminal according to an embodiment of the present invention. It is a figure which shows the position update method when moving from a cell area to a macro cell area. FIG. 6 is a diagram illustrating that a moving end moves from a terminal femto cell region to a macro cell of a paging group that has no correlation with the paging group of the femto cell according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a mobile terminal moving from a femto cell region to a macro cell of a paging group that has no correlation with the paging group of the femto cell according to an embodiment of the present invention. (A) is a diagram illustrating a mobile terminal moving from a home femto cell area to a macro cell area according to an embodiment of the present invention, and (b) is a P timer expiration according to an embodiment of the present invention. It is a figure which shows the position update method in case T timer expires before doing. (A) is a diagram illustrating that the mobile terminal moves from the home femto cell area to the macro cell area and then moves to the home femto cell area again according to an embodiment of the present invention, and (b) illustrates the present invention. FIG. 6 is a diagram illustrating a location update method when the mobile terminal returns to the home femtocell region before the P timer expires according to one embodiment. (A) is a diagram illustrating a mobile terminal moving from a macro cell region to a home femto cell region according to an embodiment of the present invention, and (b) is a diagram illustrating a mobile terminal according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a method for updating a location of a mobile terminal when moving from a cell region to a macro cell region, and FIG. 6 (c) is a mobile terminal when a T timer expires before a P timer expires according to an embodiment of the present invention. (D) is a diagram showing a location update method of a mobile terminal when the mobile terminal returns to the home femtocell area before the P timer expires, according to an embodiment of the present invention. It is. (A) is a diagram illustrating a mobile terminal moving from a home femtocell region to a femtocell region having a PGID and CSG different from the home femtocell according to an embodiment of the present invention, and (b) FIG. 7 is a diagram illustrating a method for updating a location of a mobile terminal when the mobile terminal moves from a home femto cell region to a femto cell region having a PGID and CSG different from the home femto cell according to an embodiment of the present invention; ) Is a diagram illustrating a method for updating the location of a mobile terminal when the T timer expires before the P timer expires according to an embodiment of the present invention, and FIG. It is a figure which shows the position update method of a mobile terminal when a mobile terminal returns to a home femtocell area | region before P timer expires. FIG. 6 is a diagram illustrating a mobile terminal moving from a home femto cell region to another femto cell region having the same PGID and CSG as the home femto cell according to an embodiment of the present invention; (A) is a diagram illustrating a mobile terminal moving from a home femtocell region to a femtocell region having the same PGID as a home femtocell and having a different CSG, according to an embodiment of the present invention; b) is a method for updating the location of a mobile terminal when the mobile terminal according to an embodiment of the present invention moves from the home femto cell region to a femto cell region having the same PGID as the home femto cell and having a different CSG. (C) is a diagram illustrating a method for updating the location of a mobile terminal when the T timer expires before the P timer expires, according to an embodiment of the present invention. FIG. 4 shows a method of updating a location of a mobile terminal when the mobile terminal returns to the home femtocell region before the P timer expires according to an embodiment of the invention. It is. FIG. 6 is a diagram illustrating a location update method based on a timer of a mobile terminal according to another embodiment of the present invention. FIG. 3 illustrates a method for performing two-step paging according to an embodiment of the present invention. FIG. 3 illustrates a method for performing two-stage paging according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a state in which two-stage paging is performed according to an embodiment of the present invention. It is a figure which shows the structure of the mobile terminal in which the Example of this invention can be implemented, and a base station.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the embodiments. However, the present invention is not limited to the embodiments described here, and various embodiments can be made. In the drawings, in order to clearly describe the present invention, portions not related to the description are omitted, and like portions are denoted by like reference numerals throughout the specification.

  Throughout the specification, “including” a certain component means that the component does not exclude other components but includes other components unless otherwise specified. In addition, terms such as “... part”, “... machine”, “module” described in the specification mean a unit for processing at least one function or operation, and these are hardware, software, or hardware. It can be realized by combining with software.

  Hereinafter, a method for controlling a mobile terminal for idle mode entry and paging procedures in a wireless communication system according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is a diagram illustrating an idle mode entry process and a paging process of a mobile terminal in a wireless communication system according to an embodiment of the present invention.

  In the idle mode, paging can be performed in units of paging groups. For example, the mobile terminal can be included in one or a plurality of paging groups. When an incoming call for a mobile terminal or a packet transmitted from an external network to the mobile terminal is received in each paging group, the paging controller performs paging to search for the mobile terminal. In particular, for paging, the paging controller transmits a paging message to all base stations in the paging group, and each base station that receives the paging message transmits a mobile paging advertisement (MOB_PAG-ADV) message to the mobile terminal. Broadcast.

  Referring to FIG. 4, the mobile terminal transmits a deregistration request (DREG-REQ) message to a serving base station (serving BS, SBS) that is currently communicating in order to enter the idle mode from the normal mode (S110). . That is, when the mobile terminal is communicating with the femtocell base station, the mobile terminal transmits a deregistration request message to the femtocell base station, and when the mobile terminal is communicating with the macro base station, the mobile terminal A deregistration request message is transmitted to the macro cell base station (or macro base station).

  The serving base station that has received the deregistration request message transmits the mobile terminal information and the serving base station information to the paging controller (S120). The mobile terminal information may be a MAC (Media Access Control) address of the mobile terminal, and the serving base station information may be a serving base station ID.

  The paging controller transmits information about the paging controller to the serving base station (S130).

  The serving base station transmits a deregistration command (DREG-CMD) message to the mobile terminal as a response to the deregistration request (DREG-REQ) message (S140).

  Table 1 shows a deregistration command (DREG-CMD) message transmitted from the femtocell base station when the mobile terminal enters the idle mode while communicating with the femtocell base station.

表１を参照すると、フェムトセル基地局から伝送されるＤＲＥＧ−ＣＭＤメッセージは、フェムトセル基地局ページンググループ識別子（Ｆ＿ＰＧＩＤ）、オーバーレイマクロ基地局ページンググループＩＤ（Ｍ＿ＰＧＩＤ）、フェムトセル基地局ページングオフセット及びオーバーレイマクロセル基地局ページングオフセットを含むことができる。

Referring to Table 1, a DREG-CMD message transmitted from a femtocell base station includes a femtocell base station paging group identifier (F_PGID), an overlay macro base station paging group ID (M_PGID), a femtocell base station paging offset, and an overlay. Macrocell base station paging offset may be included.

  F_PGID can be determined based on the CSG to which the femtocell base station belongs. For example, femtocell base stations included in the same CSG can use the same F_PGID.

  M_PGID is the paging group ID of the macro cell to which the femto cell belongs. The femtocell base station can transmit both F_PGID and M_PGID to the mobile terminal so that the mobile terminal has a correlation between F_PGID and M_PGID.

  The femtocell base station paging offset is a time point when the mobile terminal monitors a paging message transmitted from the paging group of the femtocell, and the overlay macro base station paging offset is a paging message transmitted by the mobile terminal from the paging group of the macrocell. Is the time to monitor.

  In addition, the DREG-CMD message may include a paging cycle and a paging listen interval.

  The mobile terminal receives the paging message through the femtocell paging information in the femtocell area, and monitors the paging message through the macrocell paging information until the mobile terminal performs location update after leaving the femtocell area.

  Note that when performing location update from a macro cell to a femto cell, the paging information of the femto cell base station and the macro base station is received through a ranging response (RNG-RSP) message as shown in Table 2. After the mobile terminal performs the location update, the paging message is received through the femtocell paging information in the femtocell region, and until the mobile terminal performs the location update after leaving the femtocell region, the mobile terminal passes through the macrocell paging information. Monitor paging messages.

表３は、移動端末がマクロ基地局と通信中において遊休モードに進入する場合、マクロ基地局から伝送されるＤＲＥＧ−ＣＭＤメッセージを表すものである。

Table 3 shows a DREG-CMD message transmitted from the macro base station when the mobile terminal enters the idle mode while communicating with the macro base station.

表３を参照すると、マクロ基地局から伝送されるＤＲＥＧ−ＣＭＤメッセージは、マクロセル基地局ページンググループＩＤ（Ｍ＿ＰＧＩＤ）、Ｍ＿ＰＧＩＤのオーバーレイマクロ基地局ページングオフセット及び移動端末のホームフェムトセル基地局のページンググループＩＤ（Ｆ＿ＰＧＩＤ）を含むことができる。すなわち、マクロセル基地局は、Ｆ＿ＰＧＩＤ及びＭ＿ＰＧＩＤを共に移動端末に伝送して、移動端末がＦ＿ＰＧＩＤとＭ＿ＰＧＩＤとの相関関係を持つようにすることができる。

Referring to Table 3, the DREG-CMD message transmitted from the macro base station includes a macro cell base station paging group ID (M_PGID), an overlay macro base station paging offset of M_PGID, and a paging group ID of the home femtocell base station of the mobile terminal. (F_PGID) can be included. That is, the macro cell base station can transmit both F_PGID and M_PGID to the mobile terminal so that the mobile terminal has a correlation between F_PGID and M_PGID.

  For example, if two home femto cell base stations of a mobile terminal are installed in the macro cell area and the two home femto cell base stations have different CSGs, the macro cell base station moves through a DREG-CMD message. M_PGID and two F_PGIDs are transmitted to the terminal so that the mobile terminal has a correlation between the M_PGID and the two F_PGIDs.

  The mobile terminal that has confirmed the DREG-CMD message enters the idle mode. The mobile terminal in the idle mode can receive the paging message based on the paging information received through the DREG-CMD message.

  When an incoming call or packet for the mobile terminal is received by the paging controller when the mobile terminal is in the idle mode (S150), the paging controller transmits a paging message to all base stations in the paging group (S160). ). The base station in the main paging group that has received the paging message broadcasts a paging advertisement (PAG-ADV) message to the mobile terminal managed by the base station (S170), and the mobile terminal receives the PAG-ADV message from the base station. Then, it enters the normal mode and communicates with the serving base station (S180).

  When the paging controller receives an incoming call or packet for the mobile terminal, the paging controller sends a paging message through the femtocell base station at the femtocell base station paging offset to locate the mobile terminal using the paging message. To transmit. If there is no response to the paging message, the paging controller transmits the paging message through the macro base station with an overlay macro base station paging offset.

  The mobile terminal in the idle mode performs location update when the location update condition is satisfied. Location update conditions include paging group location update, timer-based location update, power-down location update, MAC hash skip threshold update method, and the like.

  Timer-based position update means that position update is performed when a position update timer (hereinafter referred to as “T timer”) expires.

  Paging group location update means that location update is performed when a mobile terminal enters an area of another paging group from the paging group to which it belongs. In order to prevent the mobile terminal from frequently updating the location, the mobile terminal moves from the femto cell area to the macro cell area, moves from the macro cell area to the femto cell area, or from the femto cell area to another femto cell area. In the case of moving to, the position update method according to an embodiment of the present invention does not immediately update the position, but updates the position after a certain time from the time when the mobile terminal moves. At this time, a preset timer can be used for position update. For convenience of explanation, the preset timer is called a paging group position update timer (PG_LU_TIMER) or a position update delay timer. Here, it is desirable that the time value of the P timer is shorter than the time value of the T timer.

  Next, when the mobile terminal moves from the home femto cell region to the macro cell region, a location update method according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 5A is a diagram illustrating a mobile terminal moving from a home femto cell area to a macro cell area according to an embodiment of the present invention, and FIG. 5B is a diagram illustrating movement according to an embodiment of the present invention. It is a figure which shows the position update method in case a terminal moves from a home femtocell area | region to a macrocell area | region.

  Referring to FIG. 5 (a), F_PGID that is the paging group ID of the femto cell is set to 1, M_PGID that is the paging group ID of the macro cell is set to 0, and the femto cell is in the area of the macro cell. And M_PGID have a correlation.

  As shown in FIGS. 5 (a) and 5 (b), when the mobile terminal moves from the femtocell position A to the macrocell position B, the paging group ID of the paging group ID is 1 in the conventional technique. Since the mobile terminal has moved to the area of another paging group whose group ID is 0, the mobile terminal must perform location update. However, in one embodiment of the present invention, when a mobile terminal moves to a correlated paging group, it does not immediately update the location and starts the P timer.

  While the P timer is running, the mobile terminal monitors the paging message at the overlay macro base station paging offset. If the mobile terminal does not return to the paging group area where F_PGID is 1 when the P timer expires, the mobile terminal performs location update.

  FIG. 5 illustrates a case where the paging group ID of the femto cell and the paging group ID of the macro cell are different. However, even when the paging group ID of the femto cell and the paging group ID of the macro cell are the same, the mobile terminal When moving from the cell area to the macro cell area, the position is updated.

  FIG. 6 is a diagram illustrating that a mobile terminal moves from a femto cell region to a macro cell of a paging group that has no correlation with the paging group of the femto cell according to an embodiment of the present invention. Referring to FIG. 6, the mobile terminal moves from the femto cell region to the second macro cell (macrocell # 2) instead of the first macro cell (macrocell # 1) which is the home macro cell. In this case, since the mobile terminal has moved to a paging group having no correlation, the position is immediately updated without driving the P timer.

  FIG. 7 is a diagram illustrating a mobile terminal moving from a femto cell region through a home macro cell region to a paging group macro cell having no correlation with the femto cell paging group according to an embodiment of the present invention. . In this case, when the mobile terminal moves from the femto cell area to the home macro cell area, the P timer is started, and before the P timer expires, the paging group in which the terminal has no correlation with the femto cell paging group When moving to the macro cell area, the mobile terminal immediately updates the location and interrupts the operation of the P timer.

  FIG. 8A is a diagram illustrating a mobile terminal moving from a home femto cell region to a macro cell region according to an embodiment of the present invention, and FIG. 8B is a diagram illustrating an embodiment of the present invention. It is a figure which shows the position update method in case T timer expires before P timer expires.

  Referring to FIG. 8 (a), F_PGID that is the paging group ID of the femto cell is set to 1, M_PGID that is the paging group ID of the macro cell is set to 0, and the F_PGID is in the area of the macro cell. And M_PGID.

  Referring to FIGS. 8 (a) and 8 (b), when a mobile terminal moves from a femtocell position A to a macrocell position B, in the conventional technique, the paging group ID is 1, and the paging group ID is 1. Since it has moved to the area of the paging group whose group ID is 0, the location must be updated. However, in one embodiment of the present invention, when the mobile terminal moves to a paging group having a correlation, the P timer is started without immediately updating the location.

  Referring to FIG. 8B, when the T timer used for timer-based position update expires before the P timer expires, the mobile terminal performs position update and interrupts the operation of the P timer.

  FIG. 9A is a diagram illustrating that the mobile terminal moves from the home femto cell area to the macro cell area and then moves to the home femto cell area again according to an embodiment of the present invention. These are the figures which show the position update method in case a mobile terminal returns to a home femtocell area | region before P timer expires by one Example of this invention.

  Referring to FIG. 9A, since F_PGID that is a femtocell paging group ID is set to 1, M_PGID that is a macrocell paging group ID is set to 0, and the femtocell is in the area of the macrocell, F_PGID and M_PGID There is a correlation between them.

  Referring to FIGS. 9 (a) and 9 (b), when the mobile terminal moves from the femtocell position A to the macrocell position B, in the prior art, from the area of the paging group whose paging group ID is 1, Since the mobile terminal has moved to the area of the paging group whose paging group ID is 0, the mobile terminal must perform location update. However, in the embodiment of the present invention, when the mobile terminal moves to a paging group having a correlation, the P timer is started without immediately updating the location.

  Referring to FIG. 9B, when the mobile terminal returns to the femtocell area before the P timer expires, the mobile terminal does not perform location update and cancels the P timer.

  Next, when the mobile terminal moves from the macro cell region to the home femto cell region, a location update method according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 10 (a) is a diagram illustrating a mobile terminal moving from a macro cell region to a home femto cell region according to an embodiment of the present invention, and FIG. 10 (b) is a diagram illustrating an embodiment of the present invention. FIG. 10C is a diagram illustrating a method for updating the location of a mobile terminal when the mobile terminal moves from a home femto cell region to a macro cell region, and FIG. FIG. 10D is a diagram illustrating a method for updating the location of a mobile terminal when the T timer expires, and FIG. 10D illustrates a case where the mobile terminal is in the home femtocell region before the P timer expires according to an embodiment of the present invention. It is a figure which shows the position update method of a mobile terminal when returning to FIG.

  Referring to FIG. 10A, F_PGID that is a paging group ID of a femto cell is set to 1, M_PGID that is a paging group ID of a macro cell is set to 0, a femto cell is a home femto cell, and a femto cell is Since it is in the macro cell region, F_PGID and M_PGID have a correlation.

  Referring to FIGS. 10 (a) to 10 (d), when a mobile terminal moves from a macro cell position B to a femto cell position A, in the conventional technique, a paging group ID of 0 is used to start paging. Since the mobile terminal has moved to the area of the paging group whose group ID is 1, the mobile terminal must perform location update. However, in one embodiment of the present invention, when the mobile terminal moves to a correlated paging group, it does not immediately update the location and starts the P timer.

  Referring to FIG. 10B, if the mobile terminal does not return to the paging group area where M_PGID is 0 when the P timer expires, the mobile terminal performs location update. At this time, the T timer set when the mobile terminal enters the idle mode can be updated or canceled. If the mobile terminal moves to an area of a paging group that has no correlation with PGID1 before the P timer expires, the location is immediately updated.

  Referring to FIG. 10 (c), if the T timer used for timer-based location update expires before the P timer expires, the mobile terminal performs location update and cancels the P timer.

  Referring to FIG. 10 (d), if the mobile terminal returns to the femto cell area before the P timer expires, the P timer is canceled without updating the location.

  Next, when a mobile terminal moves from one femtocell region to another femtocell region, a location update method according to an embodiment of the present invention will be described with reference to FIGS.

  First, referring to FIG. 11, a mobile terminal location update method according to an embodiment of the present invention when a mobile terminal moves from a home femto cell area to a femto cell area having a PGID and CSG different from that of the home femto cell. I will explain.

  FIG. 11A is a diagram illustrating that a mobile terminal moves from a home femto cell region to a femto cell region having a PGID and CSG different from that of the home femto cell according to an embodiment of the present invention. FIG. 6B is a diagram illustrating a method for updating the location of a mobile terminal when the mobile terminal moves from the home femto cell region to a femto cell region having a PGID and CSG different from the home femto cell according to an embodiment of the present invention. FIG. 11 (c) is a diagram illustrating a method of updating the location of a mobile terminal when the T timer expires before the P timer expires according to an embodiment of the present invention. The mobile terminal location update method when the mobile terminal returns to the home femtocell area before the P timer expires according to an embodiment of the present invention. It is to figure.

  Referring to FIG. 11 (a) to FIG. 11 (d), a mobile terminal starts from a home femtocell where the paging group ID is 2 and the CSG is B, and the paging group ID is 1 and the CSG is A. When moving to the femtocell, the mobile terminal starts a P timer and updates the position of the macro cell based on the operation of the P timer.

  That is, as shown in FIG. 11B, if the mobile terminal does not return to the paging group area where M_PGID is 2 when the P timer expires, the mobile terminal performs location update, and FIG. As shown in FIG. 11, when the T timer used for timer-based location update expires before the P timer expires, the mobile terminal immediately updates the location, cancels the P timer, and is shown in FIG. As described above, when the mobile terminal returns to the femtocell area before the P timer expires, the mobile terminal does not perform the location update and cancels the P timer.

  Next, a location update method according to an embodiment of the present invention when a mobile terminal moves from a home femto cell region to a femto cell region having the same PGID and CSG as the home femto cell will be described with reference to FIG. explain.

  FIG. 12 is a diagram illustrating a mobile terminal moving from a home femto cell region to another femto cell region having the same PGID and CSG as the home femto cell according to an embodiment of the present invention. When the mobile terminal moves from the first home femto cell area to the second home femto cell area having the same PGID and CSG as the first home femto cell, the mobile terminal does not perform location update. Referring to FIG. 12, since the macro cell including the first home femto cell is different from the macro cell including the second home femto cell, even when the mobile terminal moves between macro cells, the mobile terminal Does not update the location.

  Furthermore, if a macro base station that is bound to a home femtocell base station is a home macro base station, and the home femtocell base station is bound to two or more home macro base stations, the mobile terminal Moves from each area of the home femtocell base station to each area of the home macro base station, and when the P timer expires, the mobile terminal does not return to the paging group area of the home femtocell base station If the location is updated.

  When the paging controller receives an incoming call or packet to the mobile terminal, the paging controller first searches for the mobile terminal using the paging message, and first performs paging through the femtocell base station with the femto base station paging offset. Transmit the message. If the paging controller cannot receive a paging message response, the paging controller transmits the paging message through the macro base station with an overlay macrocell base station paging offset.

  Next, the mobile terminal location update method according to an embodiment of the present invention when the mobile terminal has the same PGID as the home femtocell and the CSG moves from the home femtocell area to a different femtocell area. Explanation will be made with reference to FIG.

  FIG. 13 (a) is a diagram illustrating that a mobile terminal moves from a home femto cell region to a femto cell region having the same PGID as the home femto cell and having a different CSG according to an embodiment of the present invention. FIG. 13 (b) shows a case where a mobile terminal moves from a home femto cell region to a femto cell region having the same PGID as the home femto cell and having a different CSG according to an embodiment of the present invention. FIG. 13C is a diagram illustrating a location update method of a mobile terminal, and FIG. 13C illustrates a location update method of the mobile terminal when the T timer expires before the P timer expires according to an embodiment of the present invention. FIG. 13 (d) shows a case where the mobile terminal returns to the home femtocell area before the P timer expires according to an embodiment of the present invention. In a diagram illustrating a location update method of a mobile terminal.

  Referring to FIG. 13A, the mobile terminal moves from position B to position A, and both position B and position A have a PGID of 1. In this case, in the prior art, since the mobile terminal has moved to an area having the same PGID, the mobile terminal does not update the location.

  However, since many PGIDs are required for femtocells, PGIDs may be reused. In particular, when two femtocells having the same PGID are adjacent to each other, they may have different paging cycles and paging offsets. From a femtocell region, femtocells having the same PGID but different paging offsets. The mobile terminal that has moved to the area cannot receive the paging message.

  Therefore, when the mobile terminal has the same PGID as the home femtocell from the home femtocell region, but the CSG moves to a different femtocell region, the location is updated using the P timer.

  The mobile terminal can confirm the CSG of the femtocell through a broadcast channel (BCH) transmitted by the femtocell base station, additional system information, or a paging advertisement (MOB_PAG-ADV) message.

  Table 4 shows an example of the MOB_PAG-ADV message transmitted from the femtocell base station.

表４を参照すると、フェムトセル基地局から伝送されるページング広告メッセージは、フェムトセル基地局ＩＤ（ｂａｓｅ ｓｔａｔｉｏｎＩＤ、ＢＳ ＩＤ）とフェムトセル基地局が支援するＣＳＧのＩＤを含むことができる。

Referring to Table 4, the paging advertisement message transmitted from the femtocell base station may include a femtocell base station ID (base station ID, BS ID) and a CSG ID supported by the femtocell base station.

  When the mobile terminal moves from the home femtocell area to another femtocell area having the same PGID as the home femtocell but with a different CSG, the P timer is started. As shown in FIG. 13 (b), if the mobile terminal does not return to the CSG A area when the P timer expires, the location of the mobile terminal is updated, and as shown in FIG. 13 (c), the P timer If the T-timer used for timer-based location update expires before expires, the mobile terminal performs location update and cancels the P-timer. As shown in FIG. 13D, when the mobile terminal returns to the CSG A area before the P timer expires, the mobile terminal cancels the P timer without performing location update.

  FIG. 14 is a diagram illustrating a location updating method based on a timer of a mobile terminal according to another embodiment of the present invention.

  The mobile terminal can enter idle mode. At this time, the serving base station may be a macro base station (or macro cell base station) or a femto base station (or femto cell base station).

  After entering the idle mode, the mobile terminal can set a location update timer (Ttimer) (S902).

  The mobile terminal can determine whether or not the timer has expired while performing various operations. For example, the mobile terminal can determine whether or not the T timer has expired while moving from one cell area to another cell area. If the T timer expires, the mobile terminal can perform a location update. Before the T timer expires, the mobile terminal can continue to remain in idle mode.

  Before the T timer expires, the user equipment can move from the macro cell to the femto cell, from the femto cell to the macro cell, and / or from the femto cell to the femto cell (S903).

  When the paging identifiers of the macro cell and the femto cell are correlated with each other, the mobile terminal may set a position update delay timer (for example, P timer) without performing position update even when the paging group is changed. it can. Further, when the mobile terminal has joined one or more femtocells and the respective femtocells are correlated with each other, the mobile terminal does not update the position even if the paging group is changed, and sets the P timer. It can be set (S904).

  The mobile terminal can determine whether the P timer expires (S905).

  When the P timer expires, the mobile terminal can perform location update to the macro cell base station or femto cell base station in the corresponding region (S907).

  If the P timer has not expired, the mobile terminal determines whether the T timer has expired (S906). If the T timer has not expired, the mobile terminal can continuously perform the idle mode operation. At this time, an event other than the timer condition may occur. In this case, the mobile terminal can ignore the timer operation and perform an operation according to the corresponding event. Of course, even when the T timer expires, the mobile terminal can update the location to the corresponding base station (S907).

  As still another embodiment of the present invention, a mobile terminal and a base station in which the above-described embodiment of the present invention is performed will be described.

  A mobile terminal can operate as a transmitter in the uplink and as a receiver in the downlink. In addition, the base station can operate as a receiver in the uplink and operate as a transmitter in the downlink. That is, the mobile terminal and the base station can include a transmitter and a receiver for transmitting and receiving information or data.

  The transmitter and receiver can include processors, modules, portions and / or means, etc., upon which embodiments of the invention can be performed. In particular, the transmitter and the receiver may include a module (means) for performing an idle mode operation, a module for starting a timer, an antenna for transmitting and receiving a message, and the like.

  A mobile terminal used in an embodiment of the present invention may include a low power RF (Radio Frequency) / IF (Intermediate Frequency) module. The mobile terminal also has a controller function for performing the above-described embodiment of the present invention, a MAC (Medium Access Control) frame variable control function according to the service environment and the propagation environment, a handover (HandOver) function, authentication and encryption. Means for performing functions, packet modulation / demodulation functions for data transmission, high-speed packet channel coding functions, real-time modem control functions, etc., modules or parts, etc. can be included.

  The base station can transmit data received from an upper layer to the mobile terminal wirelessly or by wire. The base station may include a low power RF (Radio Frequency) / IF (Intermediate Frequency) module. In addition, the base station performs a controller function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, a time division duplex (TDD) packet scheduling, and the above-described embodiment of the present invention. Channel multiplexing function, MAC frame variable control function according to service characteristics and propagation environment, high-speed traffic real-time control function, handover (HandOver) function, authentication and encryption function, packet modulation / demodulation function for data transmission, high-speed packet Means, modules or portions for performing channel coding functions and real-time modem control functions, etc. can be included.

  Hereinafter, a location update procedure usable in another embodiment of the present invention will be described in detail.

  FIG. 15 is a diagram illustrating a method for performing two-step paging according to an embodiment of the present invention.

  FIG. 15 illustrates an operation of a mobile terminal (AMS) entering a macro base station according to an embodiment of the present invention. The macro base station includes a CSG femto base station that supports a closed subscriber group (CSG) to which the mobile terminal belongs.

  In FIG. 15, the base station or the paging controller can perform two-stage paging.

  For example, when the macro base station includes a CSG femto base station, the paging controller can transmit a paging message to the CSG femto base station and the macro base station. At this time, the paging controller does not need to transmit a paging message to other femto base stations other than the CSG femto base station and macro base stations not including the CSG femto base station. Therefore, the paging message overhead added to the network can be effectively reduced. Hereinafter, the two-stage paging message transmission method will be described in detail with reference to FIG.

  The mobile terminal transmits a deregistration request message (DREG-REQ) to the macro base station to request entry into the idle mode (S501).

  In an embodiment of the present invention, a paging offset valid timer (hereinafter referred to as P timer) may be selectively used. The P timer is a mobile terminal that moves from a cell region of a macro base station (hereinafter referred to as a macro cell region) to a cell region of a femto base station (hereinafter referred to as a femto cell region) or moves from a femto cell region to a macro cell region. In this case, it means an already set time when the mobile terminal does not update the location. The term “P timer” in the embodiments of the present invention is merely an example, and the timers that perform the same function refer to the same timer regardless of the term.

  That is, even if the condition for the mobile terminal to perform location update (for example, the mobile terminal moves from the macro base station to the CSG femto base station) is satisfied, the location update is not performed during the time when the P timer is driven. Therefore, it is possible to prevent resource waste due to extra location updates.

  In step S501, if the mobile terminal supports the P timer, a deregistration request message including the P timer parameter is transmitted to the macro base station. If the P timer is not supported, the mobile terminal deregisters without including the P timer parameter. The request message can be transmitted to the macro base station. The embodiment of the present invention will be described on the assumption that the P timer is used.

  The macro base station transmits a deregistration command (DREG-CMD) message including the P timer parameter and paging information to the mobile terminal (S502).

  Table 5 below shows an example of the DREG-CMD message used in step S502.

表５を参照すると、ＤＲＥＧ−ＣＭＤメッセージには、Ｐタイマー及びページング情報が含まれることができる。ここで、ページング情報には、マクロ基地局のＰＧＩＤ、ＣＳＧフェムトセル基地局のＰＧＩＤ、ページング周期、第１ページングオフセット（例えば、フェムトセルページングオフセット）、第２ページングオフセット（例えば、マクロセルページングオフセット）、ページング聴取区間などが含まれることができる。

Referring to Table 5, the DREG-CMD message may include a P timer and paging information. Here, the paging information includes the PGID of the macro base station, the PGID of the CSG femtocell base station, the paging cycle, the first paging offset (eg, femtocell paging offset), the second paging offset (eg, macrocell paging offset), A paging listening section or the like may be included.

  Referring to FIG. 15 again, the mobile terminal can move from the macro base station to its subscribed CSG femto base station. In this case, the mobile terminal can transmit an RNG-REQ message including a P timer to the CSG femto base station in order to perform location update to the femto base station (S503).

  Table 6 below shows an example of RNG-REQ that can be used in the embodiment of the present invention.

表６を参照すると、移動端末は、Ｐタイマーを選択的に使用することができる。例えば、移動端末が自身のＣＳＧフェムトセル領域を離れた場合、Ｐタイマーを始動し、タイマーが満了した時点に、ＣＳＧフェムトセル領域へ復帰しないと、位置更新を行うことができる。もし、Ｐタイマーが０に設定されると、移動端末は、フェムトセル領域を離れても位置更新を行わず、第２ページングオフセットを用いて、マクロ基地局からページングメッセージを受信することができる。

Referring to Table 6, the mobile terminal can selectively use the P timer. For example, if the mobile terminal leaves its own CSG femtocell area, the P timer is started, and the location can be updated if the mobile terminal does not return to the CSG femtocell area when the timer expires. If the P timer is set to 0, the mobile terminal can receive a paging message from the macro base station using the second paging offset without performing a location update even after leaving the femtocell region.

  The CSG femto base station includes a P timer parameter, a location update response parameter indicating a location update result, new paging information assigned to the mobile terminal, a paging controller identifier, and a temporary ID (Temporary ID) maintained by the mobile terminal in idle mode. ) Can be transmitted to the mobile terminal (S504).

  In FIG. 15, the mobile terminal can use the P timer not only in the CSG femto cell area but also in the macro cell area. If the mobile terminal uses the P timer, even if the mobile terminal moves from the macro base station to the CSG femto base station, the location is not updated during the P timer time. In such a case, the steps S503 and S504 are not performed. That is, the steps S503 and S504 can be performed when the P timer expires after the mobile terminal moves to the femto base station even if the P timer is not used or the P timer is used. .

  When there is a call to the mobile terminal (call) or downlink data, the paging controller (PC) transmits a paging message to the CSG femto base station (S505), and also transmits the same paging message to the macro base station. Then, two-stage paging message transmission can be performed (S505, S506).

  For example, the paging controller can transmit a paging message simultaneously or sequentially to a macro base station including a CSG femto base station and a CSG femto base station. That is, in a situation where the mobile terminal is moving from one base station to another base station, the paging controller first transmits a paging message to the CSG femto base station where the mobile terminal has updated the location, and responds to this. If there is no paging message, the paging message can be transmitted to the macro base station. Alternatively, the paging controller can simultaneously transmit a paging message to the CSG femto base station and the macro base station.

  In order to receive the paging message from the CSG femto base station having the same CSG femto cell PGID, the mobile terminal can monitor the paging message at the time indicated by the first paging offset included in the deregistration command message. . If the paging message cannot be received at the first paging offset, the mobile terminal can also monitor the paging message at the time indicated by the second paging offset.

  In the embodiment of the present invention described below with reference to FIG. 15, P timer information includes DREG-REQ / CMD message, RNG-REQ / RSP message, superframe header (SFH), or neighbor base station advertisement (NBR-ADV). It can be transmitted to the mobile terminal through a message.

  FIG. 16 is a diagram illustrating a method for performing two-stage paging according to an embodiment of the present invention.

  The basic assumptions and basic conditions in FIG. 16 are the same as those in FIG. However, FIG. 16 shows a case where the mobile terminal enters the idle mode at the femto base station. In order to enter the idle mode, the mobile terminal can transmit a deregistration request (DREG-REQ) message including a P timer to the CSG femto base station (S601).

  The CSG femto base station may transmit a deregistration command (DREG-CMD) message including at least one of P timer and paging information as a response to the deregistration request message (S602).

  Table 7 below shows an example of the DREG-CMD message used in step S602.

表７を参照すると、ＤＲＥＧ−ＣＭＤメッセージは、Ｐタイマー及びページング情報を含むことができる。ここで、ページング情報には、マクロ基地局ページンググループ識別子（Ｍａｃｒｏ ＢＳ ＰＧＩＤ）、ＣＳＧフェムトセル基地局ページンググループ識別子（ＣＳＧ Ｆｅｍｔｏｃｅｌｌ ＢＳ ＰＧＩＤ）、ページング周期、第１ページングオフセット（例えば、フェムトセルページングオフセット）、第２ページングオフセット（例えば、マクロセルページングオフセット）、ページング聴取区間などが含まれることができる。

Referring to Table 7, the DREG-CMD message may include a P timer and paging information. Here, the paging information includes macro base station paging group identifier (Macro BS PGID), CSG femtocell base station paging group identifier (CSG Femtocell BS PGID), paging cycle, first paging offset (for example, femtocell paging offset). , A second paging offset (eg, macro cell paging offset), a paging listening interval, and the like.

  The mobile terminal can move between paging areas in the idle mode. For example, the mobile terminal can move from the CSG femto cell to the macro cell region after entering the idle mode in the CSG femto cell region. In this case, the mobile terminal can perform location update from the macro base station.

  In FIG. 16, when the mobile terminal uses the P timer, even after the mobile terminal moves to the macro base station, the location update is not performed while the P timer operates. However, if the mobile terminal continues to stay in the macro cell area even after the P timer expires, the location of the macro base station must be updated.

  Therefore, the mobile terminal can transmit a ranging request (RNG-REQ) message including the P timer parameter to the macro base station in order to perform location update (S603).

  In response to this, the CSG femto base station performs the P timer parameter, the location update response parameter indicating the location update result, the new paging information assigned to the mobile terminal, the paging controller identifier, and the temporary that the mobile terminal maintains in the idle mode. A ranging response (RNG-RSP) message including one or more of the identifiers (Temporary ID) can be transmitted to the mobile terminal (S604).

  When there is a call to the mobile terminal or downlink data, the paging controller (PC) can transmit a paging message to the CSG femto base station (S605), and the same paging is also performed for the macro base station. A message can be transmitted (S606). As a result, two-stage paging message transmission can be performed (S605, S606).

  If the P timer is set to 0 in Table 7, the mobile terminal does not update the location after moving to the macro base station, and the location of the CSG femtocell base station and the location at the time of the second paging offset. Updates can be made. In this case, the mobile terminal does not perform steps S603 and S604.

  The mobile terminal can monitor the paging message at the time of the second paging offset included in the deregistration command message in order to receive the paging message from the macro base station having the same macro cell paging group identifier. However, the mobile terminal can monitor the paging message transmitted from the CSG femto base station at the first paging offset in the vicinity of the CSG femto cell.

  As another embodiment of the present invention, a method for performing two-stage paging will be described. The mobile terminal performs two-stage paging from the macro base station or the CSG femto base station in the process of entering the idle mode as shown in FIG. 15 and FIG. 16, so that the mobile terminal performs the first paging offset and the second paging offset. , CSG femto cell paging identifier and macro cell paging identifier may be received.

  However, another embodiment of the present invention shows a case where a parameter for performing two-stage paging is received while the mobile terminal performs location update. That is, the mobile terminal can receive a parameter for performing two-stage paging through a ranging response message received when performing location update.

  Table 8 below is an example of a ranging response message (RNG-RSP) that can be used in another embodiment of the present invention, and in particular, an example of a ranging response (RNG-RSP) message transmitted from a macro base station. .

表８を参照すると、ＲＮＧ−ＲＳＰメッセージは、Ｐタイマーパラメータ、位置更新の結果を表す位置更新応答パラメータ、移動端末に割り当てられた新しいページング情報、ページング制御機識別子、及び遊休モードで移動端末が維持する臨時識別子（Ｔｅｍｐｏｒａｒｙ ＩＤ）のうち、一つ以上が含まれることができる。

Referring to Table 8, the RNG-RSP message is maintained by the mobile terminal in the P timer parameter, the location update response parameter indicating the result of the location update, the new paging information assigned to the mobile terminal, the paging controller identifier, and the idle mode. One or more temporary identifiers (Temporary IDs) may be included.

  Here, the new paging information includes a macro base station paging group identifier (Macro BS PGID), a CSG femtocell base station paging group identifier (CSG Femtocell BS PGID), a paging cycle, a first paging offset (eg, femtocell paging offset). ), A second paging offset (eg, macro cell paging offset), a paging listening interval, and the like.

  Table 9 below is an example of a ranging response (RNG-RSP) message that can be used in another embodiment of the present invention, in particular, a ranging response (RNG-RSP) message transmitted by a macro base station.

表９を参照すると、ＲＮＧ−ＲＳＰメッセージは、Ｐタイマーパラメータ、位置更新の結果を表す位置更新応答パラメータ、移動端末に割り当てられた新しいページング情報、ページング制御機識別子、及び遊休モードで移動端末が維持する臨時識別子（Ｔｅｍｐｏｒａｒｙ ＩＤ）のうちの一つ以上が含まれることができる。

Referring to Table 9, the RNG-RSP message is maintained by the mobile terminal in the P timer parameter, the location update response parameter indicating the result of the location update, the new paging information assigned to the mobile terminal, the paging controller identifier, and the idle mode. One or more of temporary identifiers (Temporary IDs) may be included.

  FIG. 17 is a diagram illustrating how two-stage paging is performed according to an embodiment of the present invention.

  Referring to FIG. 17, it is assumed that CSG home femtocells supporting a CSG service subscribed to by a mobile terminal are femtocell #A and femtocell #B. Also, a paging area managed by the macro base station # 1 is defined as a macro cell # 1, and a paging area managed by the macro base station # 2 is defined as a macro cell # 2. In this case, the paging group identifiers of the macro cells # 1 and # 2 are set to “0”. That is, it is assumed that the macro cells # 1 and # 2 belong to the same paging group.

  Also, as shown in FIG. 15 or FIG. 16, the mobile terminal can enter the idle mode in the macro cell or femto cell region, and the first paging offset, the first paging offset, and the RNG-RSP message can be transmitted through the DREG-CMD message and / or the RNG-RSP message. One or more of two paging offsets, CSG femtocell paging group identifiers, and macro cell paging group identifiers may be received.

  The macro cell # 1 includes femto cells #A, #B, #C, and #D, and the macro cell # 2 includes femto cells #D, #E, and #F. That is, the macro cell # 1 includes a CSG femto cell, and the macro cell # 2 does not include a CSG femto cell. FIG. 17 shows a case where the mobile terminal moves from macro cell # 2 to macro cell # 1 in the idle mode.

  In general, even if the mobile terminal moves from the macro cell # 2 to the macro cell # 1, the mobile terminal does not perform location update because the paging group identifier is the same. However, in FIG. 17, since the macro cell # 1 includes CSG femto cells #A and #B of the mobile terminal, the mobile terminal performs location update with the macro base station # 1.

  At this time, when the mobile terminal receives an external call, the paging controller can transmit a paging notification message to the CSG femto base station and the macro base station # 1 in two steps. For example, the paging controller can transmit a paging notification message to the CSG femtocell area of the mobile terminal to search for the mobile terminal, and can transmit a paging notification message to the overlay macrocell area when there is no response.

  Therefore, the paging controller does not need to transmit a paging message to all the macro base stations or femto base stations in order to search for a mobile terminal, and the macro base station including the CSG femto base station and / or the CSG femto base station ( For example, by transmitting the paging message only to the macro base station # 1), the overhead due to the paging message can be reduced.

  As shown in FIG. 17, in order to receive a paging message in its own paging cycle, the mobile terminal transmits a paging message transmitted from the CSG femto base station and the macro base station at the first paging offset and the second paging offset, respectively. Can be monitored.

  FIG. 18 is a diagram illustrating a configuration of a mobile terminal and a base station in which an embodiment of the present invention can be implemented.

  Referring to FIG. 18, a mobile station (AMS) and a base station (ABS) transmit and receive messages by controlling antennas 800 and 810 that can transmit and receive information, data, signals, and / or messages, and the like. Modules (Tx module) 840 and 850, receiving modules (Rx module) 860 and 870 for receiving a message by controlling an antenna, memories 880 and 890 for storing information related to communication with a base station, and a processor 820 for controlling the memory , 830, respectively. Here, the base station may be a femto base station or a macro base station. The components of the mobile terminal and the base station will be described in detail as follows.

  The antennas 800 and 810 include a transmission antenna for transmitting signals generated by the transmission modules 840 and 850 and a reception antenna for receiving radio signals and transmitting them to the reception modules 860 and 870. When a multiple input multiple output (MIMO) function is supported, two or more antennas may be provided.

  Processors 820 and 830 typically control the overall operation of the mobile terminal or base station. In particular, the processors 820 and 830 include various control functions for performing the above-described embodiments of the present invention, various MAC (Medium Access Control) frame variable control functions according to the propagation environment, a handover (HandOver) function, It can perform authentication and encryption functions. The processors 820 and 830 may include an encryption module that can control encryption of various messages and a timer module that controls transmission and reception of various messages.

  The transmission modules 840 and 850 may transmit transmission data scheduled from the processors 820 and 830 to the antennas 800 and 810 after performing predetermined coding and modulation.

  The receiving modules 860 and 870 can decode and demodulate data received via the antennas 800 and 810, restore the original data, and transmit the original data to the processors 820 and 830.

  Memories 880 and 890 can store programs for processing and control of the processors 820 and 830, and input / output data (uplink grant (UL grant) received from the base station on the mobile device side). System information, station identifier (STID), flow identifier (FID), operation time (Action Time), etc.) can be temporarily stored.

  The memories 880 and 890 include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory), RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Magnetic Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory) Click, of the optical disk can include at least one type of storage medium.

  The embodiment of the present invention described above can be performed using the components and functions of the mobile terminal and the base station described in FIG. Hereinafter, the functions of the mobile terminal and the base station will be described more specifically.

  The processor 820 provided in the mobile terminal can control the idle mode operation of the mobile terminal. That is, the processor 820 can generate a DREG-REQ message and transmit it to the base station via the transmission module 840 in order to initiate an idle mode operation. In addition, the processor 820 may receive a DREG-CMD message from the base station, decode a parameter included in the DREG-CMD message, and perform an idle mode operation.

  The processor 820 of the mobile terminal can control the location update with the base station when the location update condition is satisfied in the idle mode. That is, the processor 820 of the mobile terminal can construct an RNG-REQ message including the P timer parameter and transmit it to the base station, and can receive the RNG-RSP message from the base station. At this time, the processor 820 may monitor the paging message with the first paging offset and / or the second paging offset using the P timer parameter and the new paging information included in the RNG-REQ message.

  A processor 830 provided in the base station may support idle mode operation of the mobile terminal. For example, when the processor 830 receives a DREG-REQ message from the mobile terminal, the base station processor 830 composes a DREG-CMD message including at least one of P timer and paging information and transmits the message to the mobile terminal. be able to.

  In addition, the base station can support the location update of the mobile terminal. For example, when the base station receives a ranging request (RNG-REQ) message from the mobile terminal, the processor of the base station 830 determines a ranging response (RNG-RSP) message including at least one of a P timer parameter and new paging information. Can be transmitted to the mobile terminal. At this time, the base station may be an overlay macrocell base station or a femtocell base station.

  Embodiments according to the present invention can be implemented by various means such as hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, the location update method according to an embodiment of the present invention may include one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signalsPLC). It can be realized by programmable logic devices (FPGAs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, and the like.

  In the case of implementation by firmware or software, the location update method according to an embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the function or operation described above. The software code can be stored in a memory unit and driven by a processor. The memory unit is provided inside or outside the processor, and can exchange data with the processor by various known means.

  It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the technical spirit and essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in any respect and should be considered as exemplary. The scope of the invention should be determined by reasonable analysis of the appended claims, and thus all modifications within the equivalent scope of the invention are included in the scope of the invention.

  In addition, claims which do not have an explicit citation relationship in the claims can be combined to constitute an embodiment, or can be included as a new claim by amendment after application.

  Various embodiments have been described in the detailed description.

  The embodiment of the present invention has the following effects. First, the embodiment of the present invention can reduce the number of times of location update of a mobile terminal. Second, the embodiment of the present invention can reduce the overhead due to the paging message transmission of the base station. Third, the embodiment of the present invention efficiently performs location update when a mobile terminal moves from a femto cell to a macro cell, moves from a macro cell to a femto cell, or moves from a femto cell to a femto cell. be able to.

Claims (11)

A method for performing location update in a mobile station (MS) of a wireless communication system including femtocells, comprising:
The method
A deregistration command (D REG-CMD) message including a paging group identifier (ID) of a first femtocell base station (BS) where the MS stays and a paging group ID of a macro BS including the first femtocell BS. and receiving,
The MS is, from the area of the first femtocell, while moving into the region of the second femtocell with a paging group ID is different paging group ID of the first femtocell, to start a location update delay timer over The region of the second femtocell is included in the region of the macro BS ;
When the location update delay timer has expired, and a perform location updating to the macro BS, method. The mobile station, when the location update timer over for timer based location update expires before the location update delay timer expires, performing the location update process according to claim 1. The mobile station, before the location update delay timer expires, if the MS returns to the area of the first femtocell, releasing the location update delay timer The method of claim 1. The mobile station, before the location update delay timer expires, when the MS leaves the area of the paging group of the macro BS, performing the location update process according to claim 1. A method for performing location update in a mobile station (MS) of a wireless communication system including femtocells, comprising:
The method
Receiving a deregistration command (DREG-CMD) message including the paging group identifier (ID) of the MS is caught by that first femtocell base station (BS),
And said MS is during the movement from the region of the first femtocell to the region of the second femtocells to start the location update delay timer over,
When the location update delay timer has expired, and a perform location updating to the second femtocell,
The paging group ID of the first femtocell and the paging group ID of the second femtocell are the same, and the closed femtocell group ( CSG) of the first femtocell and the CSG of the second femtocell are different . Method. Wherein the second femtocell BS, further comprising receiving a paging advertisement (MOB_PAG-ADV) message including closed subscriber group (CSG) ID of the second femtocells, the method according to claim 5. The mobile station, before the location update delay timer expires, the location update timer over for timer based location update expires, performing the location update process according to claim 5. The mobile station, before the location update delay timer expires, if the MS returns to the area of the first femtocell, releasing the location update delay timer The method of claim 5. A method for performing location update in a mobile station (MS) of a wireless communication system including femtocells, comprising:
The method
A deregistration command ( DREG-CMD) message including a paging group identifier (ID) of a first femtocell base station (BS) where the MS stays and a paging group ID of a macro BS including the first femtocell BS is received. and that,
And said MS is during the movement from the region of the first femtocell to the area of the macro the BS, and start the location update delay timer,
When the location update delay timer has expired, and a perform location updating to the second femtocell method. The mobile station, before the location update delay timer expires, when the MS leaves the area of the macro BS, immediately performs the location update method according to claim 9. The method according to claim 9 , wherein a paging group ID of the first femtocell BS and a paging group ID of the macro BS are the same.

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