KR20100048918A - Apparatus and method for managing paging in wireless communication network - Google Patents

Abstract

PURPOSE: An apparatus and a method for managing paging in a wireless communication network are provided to prevent the waste of microcell or macrocell resources by allowing femtocells to perform paging for a terminal in a paging region if a terminal moves from a paging region to a femtocell region. CONSTITUTION: A processor(302) confirms the movement of a terminal from a first cell region to a second cell region. The first and second base stations have different cell types, and a transceiver(304) transmits the information related to the movement of the terminal from the first cell region to the second cell region to the second base station. The information on the movement of the terminal is transmitted to the second base station through an AAI_RNG-REQ(Advance Air Interface Ranging-Request) message.

Description

APPARATUS AND METHOD FOR MANAGING PAGING IN WIRELESS COMMUNICATION NETWORK}

The present invention relates to communication management in a communication network, and more particularly, to an apparatus and method for paging management in a paging area in a wireless communication network.

Over the long term, technology related to communication networks has developed significantly. A communication network allows a number of communication devices, ie terminals, to communicate with each other. The communication network may be a wired communication network or a wireless communication network. For example, wired telecommunications networks include Public Switched Telephone Networks (PSTNs), and wireless telecommunications networks include Global System for Mobile Communication (GSM) networks, Code Division Multiple Access (CDMA) networks, and IEEE 802.16 groups of wireless standards. Including but not limited to communication networks. For example, a communication network for the IEEE 802.16 group of wireless standards includes the WiMAX standard.

Terminals include, but are not limited to, for example, mobile phones, personal digital assistance (PDA), laptops, and computers. The terminal may communicate with another terminal through a wireless communication network within a wireless communication range.

In a wireless communication network, a wireless communication range is divided into a plurality of regions called radio cells. A base station in a radio cell is a radio transceiver for transmitting and receiving voice and data signals with the terminal. Accordingly, in one wireless communication network, one terminal can communicate with another terminal through one or more base stations.

Base stations can be distinguished under different categories. For example, the base stations can be divided based on the coverage area. For example, a femto cell base station is a low power base station and is generally used for home or small office home office (SOHO). Macro cell base stations are high power base stations and are typically used to cover a larger communication area than femtocell base stations. In a communication network, the terminal may exist in an idle mode or an active mode. The active mode is a mode in which a terminal communicates with a base station. The idle mode is a mode in which the terminal sleeps for a specific period without being involved in active communication with the base station. In the idle mode, the UE wakes up periodically to check whether there is data or a call and to check for updates of system information broadcast by the base station.

Idle mode is designed to reduce power consumption in the terminal. In idle mode, the terminal is detected by the communication network using a paging and location update procedure. Paging can be used to determine the location of a particular terminal in a communication network or to establish a call including the terminal. However, in idle mode, the terminal does not maintain a continuous active connection with the communication network. Instead, a paging cycle is formed while the terminal wakes up at a predetermined paging point periodically to listen for paging activity in the communication network.

For efficient paging, the communication network is divided into different paging areas. Paging area is defined as a collection of base stations to which the terminal is paged. Therefore, when the terminal crosses the paging area, the terminal informs the terminal of the communication network through a procedure well known as a location update procedure. The number of base stations constituting the paging area is in a tradeoff relationship with paging load and location update frequency in a system for paging a terminal. The smaller the paging area, the greater the number of location updates. Accordingly, the mobile terminal will traverse a larger number of paging areas at a given time.

Therefore, when the first terminal located in the first paging area is paged by the second terminal, all the base stations located in the first paging area page the first terminal. Therefore, all base stations in the paging area, for example, femtocell base station, picocell base station, micro cell base station, and macro cell base station page the first terminal. Then, if the terminal position is confirmed, a communication link is established between the first terminal and the second terminal. However, it may often occur that the first terminal remains in the femtocell region for more time because the first terminal is in the femtocell region and the femtocell is associated with the home or office area. Accordingly, the resources of the microcell or macrocell may be unnecessarily wasted due to the paging load of the terminal existing in the femtocell.

Therefore, when the terminal exists in the femto cell area in the paging area, a method for effectively paging the terminal is required.

An object of the present invention is to provide an apparatus and method for managing paging in a wireless communication network.

Another object of the present invention is to provide an apparatus and method for effectively paging a terminal when the terminal exists in a femto cell region in a paging region in a wireless communication network.

Another object of the present invention is that when a terminal exists in a femto cell area in a paging area in a wireless communication network, only the femtocells in the paging area to page the terminal, so that resources of the microcell or macrocell exist in the femtocell The present invention provides a paging management apparatus and method for preventing unnecessary waste due to paging load.

According to a first aspect of the present invention for achieving the above objects, an operation method of a second base station for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, in the paging area Receiving information about a movement of a terminal from a first cell area related to a first base station to a second cell area related to a second base station, wherein the first base station and the second base station have different cell types, If at least one of the first base station and the second base station is a femtocell base station, transmitting information on movement of the terminal together with information related to the terminal to a paging controller, wherein the information related to the terminal Is one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID). Also it characterized in that it comprises one.

According to a second aspect of the present invention, a method of operating a terminal for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals includes: a first cell area related to the first base station in a paging area; Confirming the movement of the terminal to the second cell area related to the second base station in the second base station, wherein the first base station and the second base station have different cell types, and at least one of the first base station and the second base station In the case of a femtocell base station, the method includes transmitting information on movement of the terminal from the first cell area to the second cell area to the second base station.

According to a third aspect of the present invention, a method of operating a paging controller for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, wherein at least one of the first base station and the second base station is a femtocell In the case of a base station, receiving information about the movement of the terminal from the first cell region associated with the first base station to the second cell region associated with the second base station together with the information related to the terminal, wherein the first The first base station and the second base station have different cell types, and information related to the terminal is one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identity (BSID). At least one of the first base station and the second base station is a femtocell base station, and the terminal exists in the femtocell; In addition to the information related to the terminal in the database, it characterized in that it comprises a step of maintaining the presence information (presence information) of the terminal.

According to a fourth aspect of the present invention, a second base station for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals is located in a first cell area related to the first base station in the paging area. A receiver for receiving information about a movement of a terminal to a second cell region related to a second base station, wherein the first base station and the second base station have different cell types, and at least one of the first base station and the second base station; If one is a femtocell base station, it includes a transmitter for transmitting information about the movement of the terminal to the paging controller with the information related to the terminal, wherein the information related to the terminal is a mobile station identity (MSID), And at least one of a paging area identifier (PGID) and a base station identifier (BSID).

According to a fifth aspect of the present invention, a terminal for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals includes a second in a first cell area related to the first base station in the paging area. A processor for confirming movement of a terminal to a second cell region related to a base station, wherein the first base station and the second base station have different cell types, and at least one of the first base station and the second base station is a femtocell base station; In this case, it characterized in that it comprises a transceiver for transmitting information about the movement of the terminal from the first cell area to the second cell area to the second base station.

According to a sixth aspect of the present invention, a paging controller for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, when at least one of the first base station and the second base station is a femtocell base station And a transceiver for receiving information on the movement of the terminal from the first cell region related to the first base station to the second cell region related to the second base station together with the information related to the terminal, wherein the first base station and The second base station has a different cell type, and the information related to the terminal includes at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identity (BSID). And when at least one of the first base station and the second base station is a femtocell base station and the terminal exists in the femtocell, And a memory for holding presence information of the terminal together with the information related to the terminal in the memory.

The present invention provides a method for managing paging for a terminal in a paging area in a wireless communication network. The above scheme allows only the femtocells in the paging area to page the terminal when the terminal exists in the femtocell area. This approach increases the efficiency of the overall system while reducing the waste of expensive paging resources. In addition, the scheme reduces paging load in the entire paging area through selective paging for the terminal. By checking the identifier of the paged terminal, if the terminal is present in the femtocell, the terminal is paged in only one or more femtocells, and the terminal not served by the femtocell is not paged in the femtocell. This can reduce waste of expensive macrocell paging resources.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a method for managing paging in a paging area in a wireless communication network will be described.

1 is a diagram illustrating an environment considered in the present invention.

Referring to FIG. 1, the environment 100 considered in the present invention includes a paging area, a plurality of base stations (BSs), a plurality of mobile stations (MSs), and a paging controller. It is configured to include. For example, the environment 100 contemplated by the present invention includes a paging area 1 102, a plurality of base stations, for example, a plurality of macrocell base stations M1, M2 104, M3 and a plurality of femtocell base stations F1 106. , F2, F3, F4, F5, F6, a plurality of terminals MS1 (108), the paging controller 110 is configured to include. In the paging area 1 102, a plurality of base stations M1, M2, M3, F1, F2, F3, F4, F5, F6 are connected with the paging controller 110. The paging controller 110 is connected to a database 112 for storing information about the terminal MS1 and the base stations M1, M2, M3, F1, F2, F3, F4, F5, F6. In the following description, a femtocell base station may be referred to as a femtocell, and a macrocell base station may be referred to as a macro cell.

A plurality of base stations (M1, M2, M3, F1, F2, F3, F4, F5, F6) and the paging controller 110 enables communication between a plurality of terminals (MS1) in the wireless communication range. If a second terminal (not shown) wishes to communicate with a first terminal (eg, terminal MS1 108 in paging area 1 102), paging controller 110 may paging to page terminal MS1 108. Send an indication to one or more base stations in the area. In one embodiment, the paging controller 110 may know that the terminal MS1 108 exists in the femtocell or macrocell. Presence information about the terminal is stored in the database 112.

The paging controller 110 can effectively page the terminal MS1 108 using the presence information for the terminal MS1 108 in the database 112. When the terminal MS1 108 is present in the femtocell regions F1, F2, F3, F4, F5, and F6, no macrocells M1, M2, and M3 in the paging region should page the terminal MS1 108. However, when the terminal MS1 108 exists in the macrocells M1, M2, and M3 within the same paging area, a conventional paging method is used, such as the case where only the macrocell exists. In this situation, the femtocell in the paging area should not page terminal MS1 108.

This may be accomplished by informing the femtocell or macrocell in the paging area of the movement of the terminal MS1 108 in the femtocell area. In one embodiment, when the terminal enters the femtocell area, the femtocell may be notified of the movement of the terminal. Moreover, the femtocell can inform the paging controller in the network about the movement of the terminal. For example, when terminal MS1 108 enters the area of femtocell base station F1 106, terminal MS1 108 notifies femtocell base station F1 106 about its presence in the femtocell base station F1 106 area. Can be. Thereafter, the femtocell base station F1 106 may inform the paging controller 110 about the existence of the terminal MS1 108.

In another embodiment, when the terminal is leaving the femtocell, the terminal may inform the macrocell about itself. Thereafter, the macrocell may inform the paging controller in the network about the movement of the terminal. For example, terminal MS1 108 may inform macrocell base station M2 104 about its movement, and macrocell base station M2 104 may inform paging controller 110 about movement of terminal MS1 108. You can inform.

According to an embodiment, the terminal may inform the femtocell that it is entering or leaving the femtocell. Accordingly, the femtocell may inform the macrocell of the movement of the terminal and, in turn, the macrocell may inform the paging controller of the movement of the terminal. Accordingly, the paging controller may know that the terminal exists in the femtocell or macrocell.

In one embodiment, the paging controller maintains a record of all terminals served by the femtocell in idle mode. Therefore, when the paging for the terminal MS1 108 reaches the paging controller 110, the paging controller 110 checks whether the terminal MS1 108 exists in the femtocell based on the database 112 stored in the memory. do. If the terminal MS1 108 is present in the femtocell, the terminal MS1 108 is paged in one or more femtocells in the paging area.

In one embodiment, if the paging controller knows the base station identity (hereinafter referred to as 'BSID') of the femtocell in which the terminal MS1 108 exists, the paging controller only pages the terminal within a specific femtocell.

In another embodiment, if the paging controller does not know the base station identifier of the femtocell in which the terminal exists, the terminal may be paged in all femtocells in the paging area. In another embodiment, the terminal may be paged in the entire paging area 1 (102).

In another embodiment, if the terminal does not exist in the femtocell region, the terminal may be paged using an existing paging method. When the paging message arrives at the femtocell base station, the femtocell base station checks the list of terminals that are currently being served by the femtocell base station. Moreover, the femtocell base station transmits the paging if an identifier (ID) of the paged terminal matches one entry in the list, and does not transmit paging if it does not match.

2 is a diagram illustrating a configuration of a femtocell base station according to an embodiment of the present invention.

As shown, femtocell base station 106 includes a receiver 202 and a transmitter 204.

Referring to FIG. 2, the receiver 202 may receive information related to movement of a terminal from a first cell area related to a first base station in a paging area to a second cell area related to a second base station. For example, the receiver 202 receives information related to the movement of the terminal 108. When the terminal 108 moves from the area of the macrocell base station 104 to the area of the femtocell base station 106, the receiver 202 of the femtocell base station 106 may receive information about the movement of the terminal 108. Can be. The first base station and the second base station have different cell types. For example, the first base station is a macrocell base station 104 and the second base station is a femtocell base station 106.

The transmitter 204 of the femtocell base station 106 may transmit information about the movement of the terminal together with information related to the terminal, for example, the terminal 108 when at least one of the first base station and the second base station is a femtocell base station. 110). The information related to the terminal includes at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID).

3 is a diagram illustrating a configuration of a terminal according to an exemplary embodiment of the present invention.

As shown, the terminal 108 includes a processor 302 and a transceiver 304.

Referring to FIG. 3, the processor 302 checks the movement of the terminal 108 from the first cell area related to the first base station in the paging area to the second cell area related to the second base station. In one embodiment, the first base station and the second base station have different cell types. For example, the processor 302 in the terminal 108 may move the terminal 108 when the terminal 108 moves from the area related to the macrocell base station 104 to the area related to the femtocell base station 106. You can check it.

The transceiver 304 in the terminal 108 is associated with a second base station in a first cell region (region of the macrocell base station 104) associated with the first base station when at least one of the first base station and the second base station is a femtocell base station. Information about the movement of the terminal 108 to the second cell area (area of the femtocell base station 106) is transmitted. As an example, when the terminal 108 enters the femtocell region, the terminal 108 may transmit information on its movement to the femtocell. In another embodiment, the terminal 108 may transmit information on its movement to the macrocell when it leaves the femtocell area.

4 is a diagram illustrating a configuration of a paging controller according to an embodiment of the present invention.

As shown, the paging controller 110 includes a transceiver 402 and a memory 404.

Referring to FIG. 4, the transceiver 402 in the paging controller 110 may include a first cell area related to the first base station together with information related to the terminal when at least one of the first base station and the second base station is a femtocell base station. Receives information about the movement of the terminal to the second cell area related to the second base station. The first base station and the second base station have different cell types. For example, when the terminal 108 moves from the area of the macrocell base station 104 to the area of the femtocell base station 106, the transceiver 402 in the paging controller 110 is responsible for the movement of the terminal 108. Receive information. In an embodiment, the information related to the terminal may include at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID).

In the memory 404 of the paging controller 110, when at least one of the first base station and the second base station is a femtocell base station and the terminal exists in the femtocell, the memory 404 includes information on the terminal, together with information related to the terminal in the database. Maintain presence information. In one embodiment, the memory 404 is externally associated with the paging controller 110. In another embodiment, the memory 404 resides inside the paging controller 110. The memory 404 includes a database 112, and the database 112 manages existence information of a terminal existing in a femtocell.

5 is a flowchart illustrating a method of operating a second base station (eg, a femtocell base station) for managing paging in a wireless communication network according to an embodiment of the present invention.

Referring to FIG. 5, in operation 504, the second base station is connected to the second base station (femtocell base station 106) in the first cell area related to the first base station (macrocell base station 104) in the paging area. Receive information regarding the movement of the terminal, for example, the terminal 108, to the cell area. In one embodiment, the first base station and the second base station have different cell types.

In one embodiment, the first base station is at least one of a macrocell base station, a microcell base station, a picocell base station, and the second base station is a femtocell base station. In another embodiment, the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, a picocell base station. For example, the first base station is a macrocell base station, and the second base station is a femtocell base station. Moreover, the information about the movement of the terminal includes information related to the terminal entering or leaving the femtocell region.

In one embodiment, the information about the movement of the terminal is received from the terminal through an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message. In one embodiment, the information about the movement of the terminal is received through a ranging purpose indication field of the AAI_RNG-REQ message. The movement of the UE, for example, entering or leaving the femtocell area, is determined based on one or more bit values in the ranging purpose indication field of the AAI_RNG-REQ message.

In operation 506, when the at least one of the first base station and the second base station is a femtocell base station, the second base station transmits information on the movement of the terminal together with information related to the terminal to the paging controller. In an embodiment, the information related to the terminal may include at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID).

In one embodiment, the paging controller receives information about the movement of the terminal through a Location Update-Request (LU-REQ) message. For example, the LU-REQ message is transmitted to the paging controller instructing the movement of the terminal from the femtocell to at least one of a microcell, a macrocell, and a picocell. Similarly, the LU-REQ message is sent to the paging controller instructing the movement of the terminal from the at least one of the microcell, macrocell, picocell to the femtocell. In one embodiment, the method is performed according to the IEEE 802.16e standard or the 3rd Generation Partnership Project (3GPP) standard or the IEEE802.16m standard.

Thereafter, the second base station terminates the algorithm according to the present invention.

6 is a flowchart illustrating a method of operating a terminal for managing paging in a wireless communication network according to an embodiment of the present invention.

Referring to FIG. 6, in step 604, the terminal confirms movement of the terminal from the first cell area related to the first base station in the paging area to the second area related to the second base station. In one embodiment, the first base station and the second base station have different cell types. In one embodiment, the first base station is at least one of a macrocell base station, a microcell base station, a picocell base station, and the second base station is a femtocell base station. In another embodiment, the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, a picocell base station.

In step 606, when the at least one of the first base station and the second base station is a femtocell base station, the terminal transmits information about the movement of the terminal from the first cell region to the second cell region to the second base station. In other words, when the terminal enters the femtocell region, the terminal transmits information about the movement of the terminal to the femtocell base station, and the terminal enters one of the macrocell, microcell, picocell region from the femtocell region, The terminal transmits information on the movement of the terminal to one of the macro cell, micro cell, and pico cell region. In one embodiment, the terminal transmits information about the movement of the terminal through the AAI_RNG-REQ message. In one embodiment, the information about the movement of the terminal is transmitted through a ranging purpose indication field of the AAI_RNG-REQ message.

Thereafter, the terminal terminates the algorithm according to the present invention.

7 is a flowchart illustrating a method of operating a paging controller for managing paging in a wireless communication network according to an embodiment of the present invention.

Referring to FIG. 7, when at least one of the first base station and the second base station is a femtocell base station in step 704, the paging controller transmits the information to the second base station in the first cell area related to the first base station together with information related to the terminal. Receive information on the movement of the terminal to the related second cell area. For example, the paging controller receives information about the movement of the terminal when the terminal enters or leaves the femtocell region.

In one embodiment, the first base station and the second base station have different cell types. In an embodiment, the information related to the terminal may include at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID).

In operation 706, when the at least one of the first base station and the second base station is a femtocell base station and the terminal exists in the femtocell, the paging controller may present presence information of the terminal together with information related to the terminal in the database. Keep it. In one embodiment, the presence information is information about the existence of the terminal existing in the femtocell. In one embodiment, the presence information is maintained in memory. For example, the presence information and the information related to the terminal are maintained in an in-memory database.

The paging controller manages paging of the terminal existing in the femtocell based on the database. In one embodiment, when the paging controller receives the paging for the terminal from the second terminal to establish a communication channel with the terminal, the paging controller checks the existence of the terminal in the femtocell based on the presence information of the terminal in the database. For example, the paging controller scans a list of information related to a plurality of terminals in a database and checks existence information of the terminal. Then, the paging controller, if the terminal exists in the femtocell, paging the terminal in one or more femtocells in the paging area.

The paging controller then terminates the algorithm according to the invention.

8 is a flowchart illustrating a method for managing paging in a wireless communication network based on the IEEE 802.16 standard according to an embodiment of the present invention.

Referring to FIG. 8, in step 804, a terminal entering into or leaving a femtocell transmits an indication to a base station using a location update (LU) procedure in an IEEE 802.16m system. After the terminal synchronizes with the target base station, in the location update procedure, an initial ranging is performed by transmitting an RNG-REQ message including a ranging purpose indication field set to idle mode location update. Accordingly, in order to indicate entry into or out of the femtocell in the same paging area, the terminal sets a unique indication for the idle mode location update by setting the ranging purpose indication bit 3. Preliminary values of the purpose indication field may be used. For example, the ranging purpose indication bit 5 may be set to '1', and the ranging purpose indication bit 5 set as described above will be referred to as an “MS Femto presence indicator”.

According to an embodiment, the RNG-REQ message including the ranging purpose indication field may be configured in the format of Table 1 below.

Name Usage MS_Random MAC Version Ranging Purpose Indication Bit 0-if set to 1 indicates unprepared HO Bit 1-if set to 1 indicates network entry from idle mode Bit 2-if set to 1 indicates prepared HO Bit 3-if set to 1 indicates normal idle mode location update Bit 4-if set to 1 indicates emergency call setup Bit5-if set to 1 indicates that the MS has entered a femtocell, if set to 0 indicates that MS has exited from a femtocell. This is termed as MS Femto presence indicator. Bit6-if set to 1 indicates that MS has exited from a femtocell. This is termed as MS Femto absence indicator. Bit7-reserved Serving BSID Previous STID Paging Controller ID Temporary ID Paging Cycle Change Power down indicator CMAC_KEY_COUNT CMAC Tuple

In the first embodiment, bit 5 in the ranging purpose indication field is used to indicate entry into or exit from the femtocell. For example, bit 5 may be set as '1' to indicate that the terminal enters the femtocell and may be set to '0' to indicate that the terminal is out of the femtocell.

In the second embodiment, bit 5 is used to indicate entry into the femtocell and bit 6 is used to indicate departure from the femtocell. For example, bit 5 may be set as '1' to indicate that the terminal enters the femtocell, and bit 6 may be set to '1' to indicate that the terminal leaves the femtocell. In the above embodiment, if bit 5 is set to '1' and bit 6 is set to '1', the base station will treat it as invalid and ignore the RNG-REQ message. Similarly, if bit 5 is set to '0' and bit 6 is set to '0', the base station will treat it as invalid and ignore the RNG-REQ message.

Here, another bit, or a combination of bits, in the ranging purpose indication pad may be used to indicate the entry or exit of the femtocell of the terminal.

When the RNG-REQ message including the ranging purpose indication field set to the terminal femto presence indicator is received, the base station transmits an LU-REQ message to the gateway based on the RNG-REQ message in step 806. Yes, ASN-GW). At this time, the gateway forwards the LU-REQ message to a paging controller. The LU-REQ message may be enhanced to include an additional field called terminal femto presence indicator. For example, the terminal femto presence indicator field may be 1 bit information.

For example, the LU-REQ message including the terminal femto presence indicator field may be configured in the format of Table 2 below.

Name Usage Failure Indication BS Info > BSID > Serving / Target Indicator MS Info > MSID Paging Information > Anchor PC ID > Anchor PC relocation destination > Network Exit Indicator MS Femto Presence Indicator If Set to 1, it indicates that the MS is present under a Femtocell If set to 0, it indicates that the MS has exited the Femtocell

The paging controller updates the database using the information about the terminal in step 808. That is, when the LU-REQ message is received, the paging controller checks the terminal femto presence indicator field and updates the database using information about the terminal. The updated database also includes an additional field indicating the presence of the terminal in the femtocell in the paging area. In one embodiment, the database may also include a femtocell base station identifier in addition to the presence indication. In operation 810, the paging controller manages paging of the terminal in the paging area based on the updated information in the database.

For example, when paging for a terminal is received, the paging controller checks its database to check whether the terminal femto presence indicator field is set. If the terminal femto presence indicator field is set, the paging controller pages the terminal in one or more femtocells in the paging area indicated by the corresponding paging area identifier (PGID) in the database.

As an example, if the UE performs location update to the macrocell while leaving the femtocell, the UE femto presence indicator in the RNG-REQ message may be set to '0'.

Thereafter, the macrocell base station may transmit an LU-REQ message to a gateway, and the gateway may forward the LU-REQ message to a paging controller. The enhanced LU-REQ message will include a terminal femto presence indicator field set to '0'. The paging controller checks whether a PGID in the LU-REQ message matches a PGID of the terminal in a database when an LU-REQ message including a terminal femto presence indicator field set to '0' is received. If the PGID in the LU-REQ message matches the PGID of the terminal in the database, the paging controller may determine that the terminal is still in the same paging area but not currently in the femtocell. Thus, if paging for the terminal is received, the paging controller may page the terminal in one or more macrocells in the paging area.

In another embodiment, when the terminal enters the macro cell out of the femtocell, the terminal may transmit an RNG-REQ message including the MS femto absence indicator set to '1' to the macrocell. Another reserved bit may be used to indicate the UE femto absence indicator in the ranging purpose indication field of the RNG-REQ message. When the RNG-REQ message set to '1' is received by the terminal femto absence indicator, the macrocell transmits an enhanced LU-REQ message to the gateway. The terminal femto presence indicator field in the enhanced LU-REQ message is set to '0'. The gateway forwards the LU-REQ message to a paging controller.

When the LU-REQ message is received, the paging controller checks the terminal femto presence indicator field and updates the database using information about the terminal. When the paging for the terminal is received, the paging controller checks its database to check whether the terminal femto presence indicator field is set. If the terminal femto presence indicator field is not set, the paging controller pages the terminal in one or more macrocells in a paging area indicated by a corresponding paging area identifier (PGID) in the database.

In another embodiment, the terminal does not indicate entry into or out of the femtocell. In one embodiment, all femtocell base stations are part of the same paging group as the overlaid macrocell base station within the overlaid macrocell base station. When the terminal enters or leaves the femtocell, the terminal does not indicate its movement to the femtocell base station or the macrocell base station. Therefore, the paging controller does not know whether the terminal exists in the femtocell base station or the macrocell base station. Accordingly, the paging controller uses multistep paging. Within the multi-stage paging, the paging controller pages the terminal in the femtocell base stations only allowed in the first attempt. If there is no response, the paging controller pages the terminal within the entire paging area except for the femtocell base stations in the second attempt. The second attempt occurs in a next paging listening period of the terminal, and the next paging listening period occurs after a duration of the paging cycle of the terminal.

In the above embodiment, by paging the terminal on the second attempt earlier than the paging cycle period of the terminal, optimization may be performed to reduce paging latency. Two methods are possible for allocating two different paging offsets to the terminal. The first method is a method related to a femtocell base station, and the second method is a method related to a macrocell base station. When the terminal exists in the femtocell base station, the terminal monitors its paging on the femtocell specific paging offset. If the terminal is present in the macrocell base station, the terminal monitors its paging on the macrocell base station specific paging offset. The paging offset for the macrocell base station occurs after the paging offset for the femtocell base station for a duration sufficient to receive a paging response from the terminal.

In another embodiment, in a paging method, each femtocell may be identified as a single paging group. This means that the terminal performs location update when entering or exiting the femtocell. The paging controller may know that the terminal is present in the femtocell, and may page the terminal in the femtocell because the femtocell is a paging area by itself. In the paging method, there is no change in the paging design as compared to the paging design for the macrocell base station only.

In another embodiment, in the paging method, the group of femtocells may be identified as one paging group. Therefore, when the terminal exists in one paging group, the terminal paging in the macro cell is not performed.

The paging controller then terminates the algorithm according to the invention.

In one method for managing paging in a wireless communication network according to the invention the following steps are carried out.

1) A macrocell base station initially overlaid with femtocell base stations is part of the same paging group.

2) The UE informs the femtocell base station that it is entering the femtocell. Alternatively, the terminal notifies the macrocell base station that it is moving away from the femtocell base station to the macrocell base station. For example, this can be accomplished by using the location update procedure present in IEEE 802.16m.

i. The RNG-REQ message is used to indicate idle mode location update by setting a ranging purpose indication field. The ranging purpose indication field may be enhanced to indicate a terminal femto presence indicator of the terminal.

ii. The ranging purpose indication field is one bitmap, and each bit in the bitmap represents a specific purpose. For example, in the IEEE802.16m system, the ranging purpose indication field is an 8-bit bitmap, and if bit 3 is set, the set bit 3 indicates an idle mode location update. Bits 5, 6, and 7 are reserved bits, and bit 5 may be used to indicate the terminal femto presence indicator. In Boolean format, the bits may be used for signals entering or leaving the femtocell.

iii. Another reserved bit in the ranging purpose indication field in the RNG-REQ message may be used, for example, to indicate that bit 6 is out of the femtocell. The reserved bit may be referred to as a terminal femto absence indicator.

3) The femtocell base station or macrocell base station receiving the RNG-REQ message informs the paging controller about the terminal entering or leaving the femtocell base station. For example, this can be achieved by improving the location update procedure in Wimaxforum NWG release R1.2.2.

i. When the RNG-REQ message with the terminal femto presence indicator in the ranging purpose indication field set to '1' is received instead of the general idle mode location update (bit 3), the base station transmits an enhanced LU-REQ message to the gateway. The gateway then forwards it to the paging controller. The enhanced LU-REQ message includes an additional field called terminal femto presence indicator. For example, the terminal femto presence indicator field may be 1 bit information. In the above scenario, the terminal femto presence indicator field in the enhanced LU-REQ message may be set to '1'.

ii. When the LU-REQ message is received, the paging controller checks the terminal femto presence indicator field and updates the database using information about the terminal. In the scenario, the terminal femto presence indicator field is set to '1'. In one embodiment, the enhanced database includes an additional field indicating the presence of the terminal in the femtocell in the corresponding paging area. In another embodiment, the enhanced database may include a femtocell base station identifier (BSID) in addition to the existence indication since the femtocell base station identifier (BSID) may be included in the LU-REQ message if the terminal performs location update while entering the femtocell.

iii. In the first embodiment, when the terminal performs location update to the macrocell while leaving the femtocell, the terminal femto presence indicator in the RNG-REQ message will be set to '0'. The macrocell base station may set the terminal femto presence indicator field in the enhanced LU-REQ message to '0'. The macrocell base station may then forward the enhanced LU-REQ message to the gateway, which may forward it to the paging controller.

iv. In the second embodiment, when the RNG-REQ message with the terminal femto absence indicator set to '1' is received, the macrocell transmits the enhanced LU-REQ message to the gateway. The terminal femto presence indicator field in the enhanced LU-REQ message may be set to '0'. The gateway forwards the LU-REQ message to a paging controller.

v. When an LU-REQ message with the terminal femto presence indicator field set to '0' is received, the paging controller checks whether the PGID in the LU-REQ message matches the PGID of the terminal in the database. If the PGID in the LU-REQ message matches the PGID of the terminal in the database, the paging controller may determine that the terminal is still in the same paging area but not currently in the femtocell.

4) The paging controller keeps a record of all terminals served by the femtocell in idle mode.

5) When paging for the terminal reaches the paging controller, the paging controller checks whether the terminal exists in the femtocell base station based on the terminal femto presence indicator field in the database.

6) If the terminal exists in the femtocell base station, the paging controller pages the terminal in one or more femtocells in the paging area indicated by the PGID for the terminal.

7) If the terminal does not exist in the femtocell base station, the paging controller pages the terminal in one or more macrocells in the paging area indicated by the PGID for the terminal.

8) When the paging message reaches the femtocell base station, the femtocell base station checks the list of terminals that are currently being served by the femtocell base station. The femtocell base station transmits the paging if an identifier (ID) of a paged terminal matches one entry in the list, and does not transmit paging if it does not match.

In another method for managing paging in a wireless communication network according to the present invention, the following steps are performed.

1) A macrocell base station overlaid with femtocell base stations is part of the same paging group.

2) The terminal does not inform the femtocell base station or the macrocell base station whether the terminal enters or leaves the femtocell base station.

3) The paging controller does not know whether the terminal exists in the femtocell base station or macrocell base station.

4) The paging controller pages the terminal in the femtocell base stations only allowed in the first attempt.

5) If there is no response, the paging controller pages the terminal within the entire paging area except for the femtocell base stations in the second attempt.

6) The second attempt may occur in the next paging listening period of the terminal, and the next paging listening period occurs after or earlier than the duration of the paging cycle of the terminal. .

7) If the second attempt occurs earlier, there may be two ways to allocate two different paging offsets to the terminal. The first method is a method related to a femtocell base station, and the second method is a method related to a macrocell base station. Here, the paging offset for the macrocell base station occurs after the paging offset for the femtocell base station.

In another method for managing paging in a wireless communication network according to the present invention, the following steps are performed.

1) Each femtocell or group of femtocells is itself one paging area.

2) This means that the UE performs location update when the UE enters the femtocell or the group of femtocells or leaves the femtocell or the group of femtocells.

3) The paging controller may know that the terminal currently exists in the femtocell, and may page the terminal in the femtocell because the femtocell is a paging area by itself.

Such paging methods may be applied to the IEEE 802.16e standard, the 3rd Generation Partnership Project (3GPP) standard, or the IEEE802.16m standard.

The paging management method described above may be implemented by a computer readable medium storing a program for paging management. Generally, computer readable media includes computer readable recording media and computer readable transmission media. A computer readable recording medium is a data storage device capable of storing data after being read by a computer system. For example, the computer readable recording medium may include read only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device. The computer readable recording medium can also be coupled to a computer system and distributed over a network. The computer readable transmission medium may transmit a transmission carrier wave or signals (wired or wireless data transmission over the Internet).

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a view showing an environment considered in the present invention,

2 is a diagram illustrating a configuration of a femtocell base station according to an embodiment of the present invention;

3 is a view showing the configuration of a terminal according to an embodiment of the present invention;

4 is a diagram illustrating a configuration of a paging controller according to an embodiment of the present invention;

5 is a flowchart illustrating a method of operating a second base station (eg, femtocell base station) for managing paging in a wireless communication network according to an embodiment of the present invention;

6 is a flowchart illustrating a method of operating a terminal for managing paging in a wireless communication network according to an embodiment of the present invention;

7 is a flowchart illustrating a method of operating a paging controller for managing paging in a wireless communication network according to an embodiment of the present invention;

8 is a flowchart illustrating a method for managing paging in a wireless communication network based on the IEEE 802.16 standard according to an embodiment of the present invention.

Claims (40)

A method of operating a second base station for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, the method comprising: Receiving information about a movement of a terminal from a first cell area related to a first base station to a second cell area related to a second base station within a paging area, wherein the first base station and the second base station are different cells; Type, When at least one of the first base station and the second base station is a femtocell base station, transmitting information about the movement of the terminal to the paging controller along with the information related to the terminal, wherein the information related to the terminal And at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identity (BSID). The method of claim 1, The information about the movement of the terminal is received from the terminal through an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message. The method of claim 2, The information on the movement of the terminal is received through a ranging purpose indication field (ranging purpose indication field) of the AAI_RNG-REQ message. The method of claim 3, wherein Determining whether the terminal is entering the femtocell region or whether it is out of the femtocell region based on one or more bit values in the ranging purpose indication field of the AAI_RNG-REQ message. How to. The method of claim 1, The process of transmitting information on the movement of the terminal to the paging controller, A process of transmitting a location update request (LU-REQ) message to the paging controller, In this case, the LU-REQ message may be used for at least one of the movement of a terminal from at least one of a microcell, a macrocell, and a picocell to a femtocell from at least one of a microcell, a macrocell, and a picocell. Instructing. The method of claim 1, Wherein the first base station is at least one of a macro cell base station, a micro cell base station, a picocell base station, and the second base station is a femtocell base station. The method of claim 1, And the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, and a picocell base station. The method of claim 1, Information about the movement of the terminal, And information about the terminal entering the femtocell region or information about the terminal leaving the femtocell region. A method of operating a terminal for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, Confirming the movement of the terminal from the first cell area related to the first base station to the second cell area related to the second base station within the paging area, wherein the first base station and the second base station have different cell types; , If at least one of the first base station and the second base station is a femtocell base station, transmitting the information about the movement of the terminal from the first cell area to the second cell area to the second base station; . The method of claim 9, The information regarding the movement of the terminal is transmitted to the second base station through an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message. The method of claim 10, The information about the movement of the terminal is transmitted through a ranging purpose indication field of the AAI_RNG-REQ message. The method of claim 9, Wherein the first base station is at least one of a macro cell base station, a micro cell base station, a picocell base station, and the second base station is a femtocell base station. The method of claim 9, And the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, and a picocell base station. The method of claim 9, Information about the movement of the terminal, And information about the terminal entering the femtocell region or information about the terminal leaving the femtocell region. A method of operating a paging controller for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, When at least one of the first base station and the second base station is a femtocell base station, the terminal moves along with the information related to the terminal from the first cell region related to the first base station to the second cell region related to the second base station. Receiving information on the first base station and the second base station has a different cell type, the information related to the terminal is a mobile station identity (MSID), a paging area identifier (PGID) ), At least one of a base station identifier (BSID), When at least one of the first base station and the second base station is a femtocell base station, and the terminal exists in the femtocell, storing the presence information of the terminal together with information related to the terminal in a database. How to feature. The method of claim 15, Receiving paging for the terminal from a second terminal for establishing a communication channel with the terminal; Confirming the existence of the terminal in the femtocell based on the presence information of the terminal in the database; If there is a terminal in the femtocell, paging the terminal in at least one femtocell in the paging area. The method of claim 15, Receiving information on the movement of the terminal, A process of receiving a Location Update Request (LU-REQ) message from a second base station, Here, the LU-REQ message indicates at least one of the movement of the terminal from the femtocell to at least one of the microcell, the macrocell, and the picocell, and the movement of the terminal from the at least one of the microcell, the macrocell, and the picocell to the femtocell. Characterized in that. The method of claim 15, Wherein the first base station is at least one of a macro cell base station, a micro cell base station, a picocell base station, and the second base station is a femtocell base station. The method of claim 15, And the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, and a picocell base station. The method of claim 15, Information about the movement of the terminal, And information about the terminal entering the femtocell region or information about the terminal leaving the femtocell region. A second base station for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, A receiver for receiving information about the movement of a terminal from a first cell region associated with a first base station to a second cell region associated with a second base station within a paging region, wherein the first base station and the second base station are different cells; Type, When at least one of the first base station and the second base station is a femtocell base station, a transmitter for transmitting information on the movement of the terminal with the information related to the terminal to the paging controller, wherein the information related to the terminal A second base station comprising at least one of a mobile station identity (MSID), a paging area identifier (PGID), and a base station identifier (BSID). The method of claim 21, The information on the movement of the terminal, the second base station characterized in that it is received from the terminal via an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message. The method of claim 22, And information about the movement of the terminal is received through a ranging purpose indication field of the AAI_RNG-REQ message. The method of claim 23, Determining whether the terminal is entering the femtocell region or whether it is out of the femtocell region based on one or more bit values in the ranging purpose indication field of the AAI_RNG-REQ message. A second base station. The method of claim 21, The process of transmitting information on the movement of the terminal to the paging controller, A process of transmitting a location update request (LU-REQ) message to the paging controller, Here, the LU-REQ message indicates at least one of the movement of the terminal from the femtocell to at least one of the microcell, the macrocell, and the picocell, and the movement of the terminal from the at least one of the microcell, the macrocell, and the picocell to the femtocell. And a second base station. The method of claim 21, And a first base station is at least one of a macro cell base station, a micro cell base station, and a picocell base station, and the second base station is a femtocell base station. The method of claim 21, The first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, a picocell base station. The method of claim 21, Information about the movement of the terminal, And a second base station including information on a terminal entering the femtocell region or information on the terminal leaving the femtocell region. A terminal for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, the terminal comprising: A processor for identifying movement of a terminal from a first cell region associated with a first base station to a second cell region associated with a second base station within a paging region, wherein the first base station and the second base station have different cell types; , If at least one of the first base station and the second base station is a femtocell base station, the terminal comprising a transceiver for transmitting information about the movement of the terminal from the first cell area to the second cell area to the second base station . 30. The method of claim 29, The information about the movement of the terminal, characterized in that the terminal is transmitted to the second base station via an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message. 31. The method of claim 30, The information on the movement of the terminal, characterized in that the terminal is transmitted through a ranging purpose indication (ranging purpose indication field) of the AAI_RNG-REQ message. 30. The method of claim 29, And a first base station is at least one of a macro cell base station, a micro cell base station, a picocell base station, and a second base station is a femtocell base station. 30. The method of claim 29, The first base station is a femtocell base station, the second base station is a terminal, characterized in that at least one of a macrocell base station, a microcell base station, a picocell base station. 30. The method of claim 29, Information about the movement of the terminal, A terminal comprising information on a terminal entering the femtocell region or information on the terminal leaving the femtocell region. A paging controller for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, When at least one of the first base station and the second base station is a femtocell base station, the terminal moves along with the information related to the terminal from the first cell region related to the first base station to the second cell region related to the second base station. A transceiver for receiving information about the first base station and a second base station, wherein the first base station and the second base station have different cell types, and the terminal related information includes a mobile station identity (MSID) and a paging area identifier (PGID). ), At least one of a base station identifier (BSID), If at least one of the first base station and the second base station is a femtocell base station, and the terminal exists in the femtocell, including a memory for maintaining the presence information (presence information) of the terminal with information related to the terminal in the database; Paging controller. The method of claim 35, wherein the transceiver, When the paging for the terminal is received from the second terminal for establishing a communication channel with the terminal, and the existence of the terminal in the femtocell based on the presence information of the terminal in the database, the terminal in the femtocell, Paging the terminal within at least one femtocell in a paging area. 36. The method of claim 35, The information on the movement of the terminal is received through a Location Update Request (LU-REQ) message from the second base station, Here, the LU-REQ message indicates at least one of the movement of the terminal from the femtocell to at least one of the microcell, the macrocell, and the picocell, and the movement of the terminal from the at least one of the microcell, the macrocell, and the picocell to the femtocell. Paging controller, characterized in that. 36. The method of claim 35, Wherein the first base station is at least one of a macro cell base station, a micro cell base station, a picocell base station, and the second base station is a femtocell base station. 36. The method of claim 35, Wherein the first base station is a femtocell base station, and the second base station is at least one of a macrocell base station, a microcell base station, and a picocell base station. 36. The method of claim 35, Information about the movement of the terminal, Paging controller, comprising information on a terminal entering a femtocell region or information on a terminal leaving the femtocell region.

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