KR101594392B1 - Apparatus and method for managing paging in wireless communication network - Google Patents

Apparatus and method for managing paging in wireless communication network Download PDF

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KR101594392B1
KR101594392B1 KR1020090103614A KR20090103614A KR101594392B1 KR 101594392 B1 KR101594392 B1 KR 101594392B1 KR 1020090103614 A KR1020090103614 A KR 1020090103614A KR 20090103614 A KR20090103614 A KR 20090103614A KR 101594392 B1 KR101594392 B1 KR 101594392B1
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South Korea
Prior art keywords
base station
terminal
femtocell
paging
information
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KR1020090103614A
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Korean (ko)
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KR20100048918A (en
Inventor
니감 안슈만
지 바오웨이
강현정
조재희
타오리 라케쉬
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삼성전자주식회사
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Priority to IN2662/CHE/2008(PS) priority
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/04User notification, e.g. alerting and paging, for incoming communication, change of service or the like multi-step notification using statistical or historical mobility data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

The present invention relates to an apparatus and method for managing paging in a wireless communication network. 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 according to the present invention includes the steps of: Receiving information on movement of a terminal to a second cell area associated with a base station, wherein the first and second base stations have different cell types, and at least one of the first and second base stations The femtocell base station includes a mobile station identity (MSID), a paging area (MSID), and a paging area A paging area identity (PGID), and a base station identity (BSID).
Figure R1020090103614
Communication network, paging, femtocell, idle mode

Description

[0001] APPARATUS AND METHOD FOR MANAGING PAGING IN WIRELESS COMMUNICATION NETWORK [0002]

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.

BACKGROUND ART [0002] Techniques related to communication networks have been remarkably developed over a long period of time. A communication network allows a plurality of communication devices, i.e., terminals, to communicate with each other. The communication network may be a wired communication network or a wireless communication network. For example, the wired communication network includes a Public Switched Telephone Network (PSTN), the wireless communication network includes a Global System for Mobile communication (GSM) network, a Code Division Multiple Access (CDMA) network, But is not limited to, communication networks. For example, the communication network for the IEEE 802.16 group of wireless standards includes the WiMAX standard.

A terminal includes, but is not limited to, for example, a mobile phone, a personal digital assistant (PDA), a laptop, and a computer. A terminal can communicate with another terminal through a wireless communication network within a wireless communication range.

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

Base stations may be distinguished under different categories. For example, the base station may be separated based on the coverage area. For example, a femtocell base station is a low power base station and is generally used for Home or Small Office Home Office (SOHO). A macro cell base station is typically used to cover a larger communication area than a femtocell base station with a high power base station. A terminal in the communication network may exist in an idle mode or an active mode. The active mode is a mode in which the terminal communicates with the base station. The idle mode is a mode in which the terminal sleeps for a specific period without participating in active communication with the base station. In idle mode, the terminal checks whether data or call is present and wakes up periodically to check for updates of system information broadcast by the base station.

The idle mode is designed to reduce power consumption in the terminal. In idle mode, the terminal is detected by the communications network using paging and location update procedures. Paging may be used to determine the location of a particular terminal in the communication network or to establish a call comprising the terminal. However, in the 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 periodically predetermined paging point to listen for paging activity in the communication network.

For efficient paging, the communication network is divided into different paging areas. The paging area is defined as a group of base stations to which the terminal is paged. Therefore, when the terminal traverses the paging area, the terminal informs the terminal through the communication network through a well-known procedure as a location update procedure. The number of base stations constituting the paging area is in a tradeoff relation with the paging load and the location update frequency in the system for paging the terminal. The smaller the paging area, the more frequent the location update. 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 base stations located in the first paging area paging the first terminal. Accordingly, all the base stations in the paging area, for example, the femtocell base station, the picocell base station, the micro cell base station, and the macro cell base station paging the first terminal. Thereafter, when the terminal position is confirmed, a communication link is established between the first terminal and the second terminal. However, it is often the case that the first terminal is in the femtocell area and the femtocell is associated with the home or office area, so that the first terminal remains in the femtocell area for more time. Accordingly, the resources of the microcell or the macrocell can be unnecessarily wasted due to the paging load of the terminals existing in the femtocell.

Therefore, if a terminal exists in the femtocell region in the paging area, a scheme for effectively paging the terminal is required.

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

It is another object of the present invention to provide an apparatus and method for efficiently paging a mobile station when the mobile station exists in a femtocell region in a paging area in a wireless communication network.

It is another object of the present invention to provide a method and apparatus for enabling a femtocell in a paging area to paging a terminal when a terminal exists in the femtocell area in a paging area in a wireless communication network, And a paging management apparatus and method for preventing a paging load from being unnecessarily wasted.

According to a first aspect of the present invention, there is provided a method of operating a second base station for managing paging for a mobile station in a paging area including a plurality of base stations and a plurality of mobile stations, Receiving information on movement of a terminal from a first cell area associated with a first base station to a second cell area associated with a second base station, wherein the first and second base stations have different cell types, And transmitting information related to the movement of the mobile station to the paging controller in a case where at least one of the first base station and the second base station is a femtocell base station, A mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID) Also it characterized in that it comprises one.

According to a second aspect of the present invention, there is provided 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, Wherein the first and second base stations have different cell types and at least one of the first base station and the second base station is different from the first base station and the second base station, And transmitting information about movement of the mobile station from the first cell area to the second cell area to the second base station in the case of the femtocell base station.

According to a third aspect of the present invention, there is provided a method of operating a paging controller for managing paging for a mobile station in a paging area including a plurality of base stations and a plurality of mobile stations, wherein at least one of the first base station and the second base station includes: Receiving information on movement of a mobile station from a first cell area associated with the first base station to a second cell area associated with a second base station together with information related to the mobile station when the mobile station is a base station, 1 base station and the second base station have different cell types and the information related to the mobile station includes a mobile station identity (MSID), a paging area identity (PGID), and a base station identity At least one of the first base station and the second base station is a femtocell base station and the terminal is present in a femtocell, And maintaining presence information of the terminal together with information related to the terminal in the database.

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

According to a fifth aspect of the present invention, there is provided a terminal for managing paging for a terminal in a paging area including a plurality of base stations and a plurality of terminals, Wherein the first and second base stations have different cell types and at least one of the first and second base stations is a femtocell base station, And a transceiver for transmitting, to the second base station, information on the movement of the terminal from the first cell area to the second cell area.

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

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. The scheme also reduces the paging load in the entire paging area through selective paging for the terminal. If the terminal is present in the femtocell, the terminal is paged in at least one femtocell, and a terminal not served by the femtocell is not paged in the femtocell. This can reduce the waste of expensive macro cell paging resources.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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

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

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), a paging controller . For example, the environment 100 considered in the present invention includes a paging area 1 102, a plurality of base stations, for example, a plurality of macro cell base stations M1, M2 104, M3 and a plurality of femtocell base stations F1 106, F2, F3, F4, F5, and F6, a plurality of terminals MS1 108, and a paging controller 110. In the paging area 1 102, a plurality of base stations M1, M2, M3, F1, F2, F3, F4, F5 and F6 are connected to the paging controller 110. [ The paging controller 110 is connected to the database 112 for storing information on the MS MS1 and the base stations M1, M2, M3, F1, F2, F3, F4, F5 and 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 macrocell.

The plurality of base stations M1, M2, M3, F1, F2, F3, F4, F5 and F6 and the paging controller 110 enable communication between a plurality of terminals MS1 in a wireless communication range. When a second terminal (not shown) wants to communicate with a first terminal (e.g., terminal MS1 108 in paging area 1 102), the paging controller 110 may paging the terminal MSl 108 And sends 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 is present in the femtocell or macrocell. Presence information for the terminal is stored in the database 112.

The paging controller 110 may effectively page the terminal MS1 108 using the presence information for the terminal MS1 108 in the database 112. [ No macro cells M1, M2, and M3 in the paging area should paging the terminal MS1 108 when the terminal MS1 108 is present in the femtocell areas F1, F2, F3, F4, F5, and F6. However, when the terminal MS1 108 exists in the macrocells M1, M2, and M3 within the same paging area, a normal paging method is used as in the case where only macrocells exist. In this situation, the femtocell in the paging area should not paging terminal MS1 108. [

This can be accomplished by informing the femtocell or macrocell in the paging area about the movement of the terminal MS1 108 in the femtocell area. In one embodiment, if the terminal is entering the area of the femtocell, the femtocell may be informed of the movement of the terminal. Furthermore, the femtocell can inform the intra-network paging controller of the movement of the terminal. For example, when the terminal MS1 108 enters the area of the femtocell base station F1 106, the terminal MS1 108 notifies the femtocell base station F1 106 of its existence in the area of the femtocell base station F1 106 . The femtocell base station F1 106 may then inform the paging controller 110 of the presence of the terminal MS1 108. [

In another embodiment, if the terminal is out of the femtocell, the terminal can inform the macrocell about itself. Thereafter, the macrocell can inform the intra-network paging controller of the movement of the terminal. For example, the terminal MS1 108 may inform the macrocell base station M2 104 of its movement and the macrocell base station M2 104 may inform the paging controller 110 about the movement of the terminal MS1 108 Can be informed.

In one embodiment, the terminal may inform the femtocell that it is entering or leaving the femtocell. Accordingly, the femtocell notifies the macrocell of the movement of the mobile station, and the macrocell can sequentially inform the paging controller of the movement of the mobile station. Accordingly, the paging controller can know that the UE exists in the femtocell or macro cell.

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

In one embodiment, if the paging controller knows a base station identity (BSID) of a femtocell in which the MS1 108 resides, the paging controller only pages the terminal in 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 can be paged in all the 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 is not in the femtocell area, 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 currently being served by the femtocell base station in the idle mode. Further, the femtocell base station transmits the paging if the identification (ID) of the paged terminal is matched with one entry in the list, and does not transmit the paging if it is not matched.

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

As shown, the 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 mobile station from a first cell area associated with a first base station in a paging area to a second cell area associated with 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 receives information about the movement of the terminal 108 . The first and second base stations have different cell types. For example, the first base station is a macro cell base station 104 and the second base station is a femtocell base station 106.

The transmitter 204 of the femtocell base station 106 transmits 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 identity (PGID), and a base station identity (BSID).

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

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

Referring to FIG. 3, the processor 302 confirms the movement of the terminal 108 from the first cell area associated with the first base station in the paging area to the second cell area associated with the second base station. In one embodiment, the first and second base stations 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 associated with the macrocell base station 104 to the area associated with the femtocell base station 106 Can be confirmed.

The transceiver 304 in the terminal 108 is associated with the second base station in the first cell area (the area of the macro cell 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 And transmits information on the movement of the terminal 108 to the second cell area (area of the femtocell base station 106). In one embodiment, the terminal 108 may transmit information about its movement to the femtocell when it enters the femtocell area. In another embodiment, the terminal 108 may transmit information about its movement to the macrocell when it is out of 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, when at least one of the first base station and the second base station is a femtocell base station, To the second cell area associated with the second base station. The first and second base stations 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 may determine the movement of the terminal 108 Information is received. In one embodiment, the information related to the terminal includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID).

If at least one of the first base station and the second base station is a femtocell base station and the terminal is present in the femtocell, the memory 404 in the paging controller 110 may include information related to the terminal in the database, presence information. In one embodiment, the memory 404 is externally associated with the paging controller 110. In another embodiment, the memory 404 resides within the paging controller 110. The memory 404 includes a database 112, and the database 112 manages existence information of a terminal existing in the femtocell.

5 is a flowchart illustrating an operation method of a second base station (e.g., 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 step 504, the second base station transmits a second (second) signal related to the second base station (femtocell base station 106) in a first cell region related to a first base station (macro cell base station 104) Information on the movement of the terminal, for example, the terminal 108, to the cell area. In one embodiment, the first and second base stations have different cell types.

In an embodiment, the first base station is at least one of a macro cell base station, a microcell base station, and 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 macro cell base station, a microcell base station, and a picocell base station. For example, the first base station is a macro cell base station and the second base station is a femtocell base station. Further, the information about the movement of the terminal includes information related to the terminal entering the femtocell region or departing from the femtocell region.

In one embodiment, 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, information on the movement of the UE is received through a ranging purpose indication field of the AAI_RNG-REQ message. The movement of the UE, for example, whether it enters the femtocell zone or the femtocell zone, is checked based on one or more bit values in the ranging target indication field of the AAI_RNG-REQ message.

If at least one of the first base station and the second base station is a femtocell base station in step 506, the second base station transmits information on the movement of the mobile station together with the information related to the mobile station to the paging controller. In one embodiment, the information related to the terminal includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID).

In one embodiment, the paging controller receives information about the movement of the terminal through an LU-REQ (Location Update-Request) message. For example, the LU-REQ message instructs a femtocell to move a terminal to at least one of a micro cell, a macro cell and a picocell, and is transmitted to a paging controller. Similarly, the LU-REQ message is transmitted to the paging controller by instructing movement of a terminal from at least one of a micro cell, a macro cell, and a picocell to a 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 IEEE 802.16m standard.

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

6 is a flowchart illustrating an operation method of 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 mobile station confirms the movement of the mobile station from the first cell area associated with the first base station to the second area associated with the second base station in the paging area. In one embodiment, the first and second base stations have different cell types. In an embodiment, the first base station is at least one of a macro cell base station, a microcell base station, and 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 macro cell base station, a microcell base station, and a picocell base station.

In step 606, if the first base station and the second base station are femtocell base stations, the mobile station transmits information about movement of the mobile station from the first cell area to the second cell area to the second base station. In other words, when the UE enters the femtocell region, the UE transmits information about the movement of the UE to the femtocell base station. When the UE moves out of the femtocell region and enters one of the macro cell, microcell, and picocell regions, The terminal transmits information on the movement of the terminal to one of the macro cell, the micro cell, and the picocell region. In one embodiment, the UE transmits information about the movement of the UE through an AAI_RNG-REQ message. In one embodiment, the information about the movement of the UE 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 an operation method of a paging controller for managing paging in a wireless communication network according to an embodiment of the present invention.

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

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

If at least one of the first base station and the second base station is a femtocell base station and the terminal is present in the femtocell, the paging controller transmits presence information of the terminal along with information related to the terminal in the database, Lt; / RTI > In one embodiment, the presence information is information on the existence of a terminal existing in the femtocell. In one embodiment, the presence information is maintained in memory. For example, the presence information and information related to the terminal are maintained in an in-memory database.

The paging controller manages the paging of the terminals existing in the femtocell based on the database. In one embodiment, when the paging of the terminal is received from a second terminal that wants to establish a communication channel with the terminal, the paging controller checks 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 the database and verifies presence information of the terminals. The paging controller then pays the terminal within one or more femtocells in the paging area if the terminal is present in the femtocell.

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, an MS entering or leaving a femtocell transmits an instruction to a BS using a Location Update (LU) procedure in the IEEE 802.16m system. After synchronizing with the target BS, the MS transmits an RNG-REQ (Ranging-Request) message including a ranging target indication field set in the idle mode location update in the location update procedure to perform initial ranging. Therefore, in addition to setting the unique indication for the idle mode location update by setting the ranging target indication bit 3, the terminal may set the unique indication for the idle mode location update to indicate the entry into the femtocell in the same paging area, The preliminary value of the destination indication field can be used. For example, the ranging target indication bit 5 may be set to '1'. Hereinafter, the ranging target indication bit 5 set as described above will be referred to as a " MS Femto Presence Indicator ".

In one embodiment, the RNG-REQ message including the ranging target indication field may be configured in the format shown in Table 1 below.

Name Usage MS_Random MAC Version Ranging Purpose Indication Bit0 - if set to 1 indicates unprepared HO
Bit1 - if set to 1 indicates network entry from idle mode
Bit2 - if set to 1 indicates prepared HO
Bit3 - if set to 1 indicates normal idle mode location update
Bit4 - 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 the 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.
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 to '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 the deviation from the femtocell. For example, bit 5 may be set to '1' to indicate that the terminal enters the femtocell, and bit 6 may be set to '1' to indicate that the terminal is out of the femtocell. In this 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, other bits in the ranging target indicator field, or a combination of bits may be used to indicate the entry of the terminal into or from the femtocell.

Upon receiving an RNG-REQ message including a ranging target indication field set to the terminal femto presence indicator, the BS transmits a Location Update-Request (LU-REQ) message based on the RNG-REQ message to the gateway Yes, ASN-GW). At this time, the gateway forwards the LU-REQ message to the paging controller. The LU-REQ message may be enhanced to include an additional field referred to as a terminal femto presence indicator. For example, the terminal femto presence indicator field may be 1-bit information.

For example, an LU-REQ message including the terminal femto presence indicator field may be configured in the format shown in 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

In step 808, the paging controller updates the database using the information about the terminal. That is, when the LU-REQ message is received, the paging controller checks the terminal femto presence indicator field and updates the database using the information about the terminal. The updated database also includes an additional field indicating the presence of a 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 step 810, the paging controller manages the paging of the terminals in the paging area based on the updated information in the database.

For example, when the paging for the terminal is received, the paging controller checks its database and checks whether the terminal femto presence indicator field is set. If the terminal femtosity indicator field is set, the paging controller pages one or more terminals in the femtocell within a paging area indicated by a paging area identifier (PGID) in the database.

In one embodiment, if the UE performs location update to the macro cell while leaving the femtocell, the terminal femto presence indicator in the RNG-REQ message may be set to '0'.

Thereafter, the macro cell BS transmits an LU-REQ message to the gateway, and the gateway can forward the LU-REQ message to the paging controller. The enhanced LU-REQ message includes a terminal femto presence indicator field set to '0'. Upon receiving an LU-REQ message including a terminal femto presence indicator field set to '0', 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 can determine that the terminal is still in the same paging area but does not exist in the current femtocell. Thus, if a paging for the terminal is received, the paging controller may page the terminal within one or more macrocells in the paging area.

In another embodiment, when the UE moves out of the femtocell and enters the macro cell, the UE may transmit an RNG-REQ message including a femto non-existent indicator set to '1' to the macro cell. Another spare bit in the ranging target indication field of the RNG-REQ message may be used to indicate the terminal femto member indicator. When an RNG-REQ message with the terminal femto member indicator set to '1' is received, the macro cell 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 the paging controller.

Upon receiving the LU-REQ message, the paging controller checks the terminal femto presence indicator field and updates the database using the information about the terminal. When the paging of the terminal is received, the paging controller checks its database and checks whether the terminal femto existence indicator field is set. If the terminal femto presence indicator field is not set, the paging controller pages the terminal in one or more macro cells in the paging area indicated by the paging area identity (PGID) in the database.

In another embodiment, the terminal does not indicate entry into or exit from the femtocell. In one embodiment, all femtocell basestations are part of the same paging group as the overlaid macrocell basestations in the overlaid macrocell basestations. When a terminal enters or leaves a femtocell, the terminal does not instruct 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 macro cell base station. Accordingly, the paging controller uses multi-step paging. Within the multi-step paging, the paging controller pages the terminal within only the allowed femtocell base stations in the first attempt. If there is no response, the paging controller pages the terminal in the entire paging area excluding 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 interval occurs after a duration of the paging cycle of the terminal.

In this embodiment, optimization may be performed to reduce the paging latency by paging the terminal in the second attempt earlier than the terminal's paging cycle period. Two methods are available for assigning the terminal to two different paging offsets. The first method relates to a femtocell base station, and the second method relates to a macrocell base station. If the terminal is present in the femtocell base station, the terminal monitors its own paging on the femtocell specific paging offset. When a terminal exists in a macro cell base station, the terminal monitors its paging on a macro cell base station specific paging offset. The paging offset for the macro cell base station occurs after the paging offset for the femtocell base station for a duration sufficient to receive the paging response from the terminal.

In another embodiment, in the paging method, each femtocell may be identified as a paging group by itself. This means that when the UE enters or leaves the femtocell, the location update is performed. The paging controller can know that the UE exists in the current femtocell and can paging the UE in the femtocell since the femtocell is a paging area by itself. The paging method has no change in the paging design as compared to the paging design for the macro cell base station only.

In another embodiment, the group of femtocells in the paging method may be identified as being a single paging group by itself. Therefore, when the terminal exists in one paging group, 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 present invention, the following steps are performed.

1) Macrocell basestations initially overlaid with femtocell base stations are part of the same paging group.

2) The terminal informs the femtocell base station that it is entering the femtocell. Alternatively, the MS informs the macro cell BS that it is moving from the femtocell base station to the macro cell BS. For example, this can be accomplished by using a location update procedure that resides in IEEE 802.16m.

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

ii. The ranging target indication field is one bitmap, and each bit in the bitmap indicates a specific purpose. For example, in the IEEE 802.16m system, the ranging target indication field is an 8-bit bitmap, and if bit 3 is set, the set bit 3 indicates the idle mode location update. Bits 5, 6 and 7 are spare bits and bit 5 can be used to indicate a terminal femto presence indicator. In Boolean format, the bit can be used for signals entering or leaving a femtocell.

iii. Another spare bit in the ranging purpose indication field in the RNG-REQ message may be used, for example, to indicate that bit 6 deviates from the femtocell. The spare bit may be referred to as a terminal femto member indicator.

3) The femtocell base station or the macro cell base station receiving the RNG-REQ message notifies the paging controller of the terminal entering the femtocell base station or departing from 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 an RNG-REQ message having a terminal femto presence indicator set to '1' in a ranging target indication field is received instead of an instruction of a general idle mode location update (bit 3), the BS transmits an enhanced LU- And the gateway forwards it to the paging controller. The enhanced LU-REQ message includes an additional field called a 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 the information about the terminal. In the above 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 a terminal in the femtocell in the corresponding paging area. In another embodiment, the enhanced database may include a femtocell base station identifier (BSID) in the LU-REQ message if the location update is performed while the terminal enters the femtocell.

iii. In the first embodiment, when performing a location update in a macro cell while the terminal is out of the femtocell, the terminal femto presence indicator in the RNG-REQ message will be set to '0'. The macro cell BS can set the terminal femto presence indicator field in the enhanced LU-REQ message to '0'. Thereafter, the macro cell base station forwards the enhanced LU-REQ message to the gateway, which can forward it to the paging controller.

iv. In the second embodiment, when an RNG-REQ message having a terminal femto member indicator set to '1' is received, the macro cell transmits an 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 the paging controller.

v. When an LU-REQ message having a 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 can determine that the terminal is still in the same paging area but does not exist in the current femtocell.

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

5) When the paging of the terminal reaches the paging controller, the paging controller checks whether the terminal is present 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 within the paging area indicated by the PGID for the terminal.

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

8) When the paging message arrives at the femtocell base station, the femtocell base station checks the list of terminals currently being served by the femtocell base station in the idle mode. The femtocell base station transmits the paging if the identification (ID) of the paged terminal matches the one entry in the list, and does not transmit the paging if it is not matched.

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

1) Macrocell basestations overlaid with femtocell base stations are part of the same paging group.

2) The terminal does not inform the femtocell base station or the macro cell 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 within only the allowed femtocell base stations in the first attempt.

5) If there is no response, the paging controller pages the terminal in the entire paging area excluding 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 interval occurs after the duration of the paging cycle of the terminal or earlier .

7) If the second attempt occurs earlier, there may be two ways to assign the terminal two different paging offsets. The first method relates to a femtocell base station, and the second method relates to a macrocell base station. Here, the paging offset for the macro cell 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 a paging area.

2) This means that if the UE enters a group of femtocells or femtocells, or if it moves out of a group of femtocells or femtocells, it performs location update.

3) The paging controller can know that the terminal exists in the current femtocell, and can paging the terminal in the femtocell since the femtocell is a paging area by itself.

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

The paging management method described above can be implemented by a computer-readable medium that stores a program for paging management. In general, the computer-readable medium includes a computer-readable recording medium and a computer-readable transmission medium. 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 a ROM (Read Only Memory), a RAM (Random Access Memory), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device. In addition, the computer-readable recording medium may be connected to a computer system and distributed over a network. The computer readable transmission medium may transmit a carrier wave or signals (wired or wireless data transmission over the Internet).

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram illustrating the 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 diagram illustrating a configuration of a terminal according to an embodiment of the present invention;

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

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

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

FIG. 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; and

8 is a flow diagram illustrating a method for managing paging in a wireless communication network based on the IEEE 802.16 standard, in accordance with an embodiment of the present invention.

Claims (40)

  1. A method of operating a second base station in a wireless communication system,
    Receiving information on movement of a terminal from a first cell area associated with a first base station to a second cell area associated with a second base station in a paging area;
    If at least one of the first base station and the second base station is a femtocell base station, only the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area transmits a paging message And transmitting information about the movement of the terminal to the paging controller along with information related to the terminal.
  2. The method according to claim 1,
    Wherein the first and second base stations have different cell types,
    The information on the movement of the mobile station includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID), and AAI_RNG-REQ Advance Air Interface Ranging-Request) message.
  3. 3. The method of claim 2,
    Wherein information on the movement of the UE is received through a ranging purpose indication field of the AAI_RNG-REQ message.
  4. The method of claim 3,
    Further comprising checking at least one of whether the UE is entering a femtocell zone and whether the UE is departing from the femtocell zone based on one or more bit values in a ranging target indication field of the AAI_RNG-REQ message.
  5. The method according to claim 1,
    The method of claim 1, wherein the step of transmitting information about the movement of the terminal to the paging controller comprises:
    And transmitting a Location Update Request (LU-REQ) message to the paging controller,
    The LU-REQ message indicates at least one of movement of a terminal from a femtocell to at least one of a micro cell, a macro cell, and a picocell, and a movement of a terminal from at least one of a micro cell, a macro cell and a picocell to a femtocell Way.
  6. The method according to claim 1,
    The first base station is at least one of a macro cell base station, a micro cell base station, and a picocell base station,
    Wherein the second base station is a femtocell base station.
  7. The method according to claim 1,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  8. The method according to claim 1,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
  9. A method of operating a terminal in a wireless communication system,
    Confirming movement of a terminal from a first cell area associated with a first base station to a second cell area associated with a second base station within a paging area;
    If at least one of the first base station and the second base station is a femtocell base station, only the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area transmits a paging message To the second base station, information about movement of the terminal from the first cell region to the second cell region.
  10. 10. The method of claim 9,
    Wherein the first and second base stations have different cell types,
    Wherein the information about the movement of the mobile station is transmitted to the second base station through an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message.
  11. 11. The method of claim 10,
    Wherein the information on the movement of the UE is transmitted through a ranging purpose indication field of the AAI_RNG-REQ message.
  12. 10. The method of claim 9,
    The first base station is at least one of a macro cell base station, a micro cell base station, and a picocell base station,
    Wherein the second base station is a femtocell base station.
  13. 10. The method of claim 9,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  14. 10. The method of claim 9,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
  15. A method of operating a paging controller in a wireless communication system,
    When at least one of the first base station and the second base station is a femtocell base station, information about a movement of a terminal from a first cell region associated with the first base station to a second cell region associated with the second base station, Comprising the steps of:
    And transmitting a paging message to the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area based on the information about the movement of the terminal.
  16. 16. The method of claim 15,
    The method comprising the steps of: if at least one of the first base station and the second base station is a femtocell base station and the terminal is present in a femtocell, storing presence information of the terminal together with information related to the terminal in a database;
    Receiving paging for the terminal from a second terminal for forming a communication channel with the terminal;
    Confirming existence of a terminal in the femtocell based on presence information of the terminal in the database;
    And if the terminal exists in the femtocell, paging the terminal in one or more femtocells in the paging area.
  17. 16. The method of claim 15,
    Wherein the first and second base stations have different cell types,
    The information related to the terminal includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID)
    The step of receiving information on the movement of the terminal comprises:
    And receiving a Location Update Request (LU-REQ) message from the second base station,
    The LU-REQ message indicates at least one of movement of a terminal from a femtocell to at least one of a micro cell, a macro cell, and a picocell, and a movement of a terminal from at least one of a micro cell, a macro cell and a picocell to a femtocell Way.
  18. 16. The method of claim 15,
    The first base station is at least one of a macro cell base station, a micro cell base station, and a picocell base station,
    Wherein the second base station is a femtocell base station.
  19. 16. The method of claim 15,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  20. 16. The method of claim 15,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
  21. An apparatus in a second base station in a wireless communication system,
    A receiver for receiving information on movement of a terminal from a first cell area associated with a first base station to a second cell area associated with a second base station within a paging area;
    If at least one of the first base station and the second base station is a femtocell base station, only the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area transmits a paging message And a transmitter for transmitting information about the movement of the terminal to the paging controller along with information related to the terminal.
  22. 22. The method of claim 21,
    Wherein the first and second base stations have different cell types,
    The information on the movement of the mobile terminal includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID) , And is received from the terminal through an AAI_RNG-REQ (Advance Air Interface Ranging-Request) message.
  23. 23. The method of claim 22,
    Wherein the information on the movement of the UE is received through a ranging purpose indication field of the AAI_RNG-REQ message.
  24. 24. The method of claim 23,
    Further comprising a processor for checking whether at least one of the at least one bit value in the ranging target indication field of the AAI_RNG-REQ message indicates whether the terminal is entering the femtocell region and whether the terminal is departing from the femtocell region.
  25. 22. The method of claim 21,
    The transmitter transmits an LU-REQ (Location Update Request) message to the paging controller,
    The LU-REQ message indicates at least one of movement of a terminal from a femtocell to at least one of a micro cell, a macro cell, and a picocell, and a movement of a terminal from at least one of a micro cell, a macro cell and a picocell to a femtocell Device.
  26. 22. The method of claim 21,
    The 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.
  27. 22. The method of claim 21,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  28. 22. The method of claim 21,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
  29. An apparatus of a terminal in a wireless communication system,
    A processor for confirming the movement of the terminal from the first cell area associated with the first base station to the second cell area associated with the second base station within the paging area;
    If at least one of the first base station and the second base station is a femtocell base station, only the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area transmits a paging message To the second base station, information about the movement of the terminal from the first cell region to the second cell region.
  30. 30. The method of claim 29,
    Wherein the first and second base stations have different cell types,
    Wherein the information about the movement of the UE is transmitted to the second base station through an Advance Air Interface Ranging-Request (AAI_RNG-REQ) message.
  31. 31. The method of claim 30,
    Wherein the information on the movement of the UE is transmitted through a ranging purpose indication field of the AAI_RNG-REQ message.
  32. 30. The method of claim 29,
    The 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.
  33. 30. The method of claim 29,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  34. 30. The method of claim 29,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
  35. An apparatus of a paging controller in a wireless communication system,
    When at least one of the first base station and the second base station is a femtocell base station, information about a movement of a terminal from a first cell region associated with the first base station to a second cell region associated with the second base station, And a transceiver for receiving the paging message to the second base station among the plurality of base stations including the first base station and the second base station associated with the paging area based on the information about the movement of the terminal .
  36. 36. The method of claim 35,
    When at least one of the first base station and the second base station is a femtocell base station and the terminal exists in a femtocell, a memory for holding presence information of the terminal together with information related to the terminal is stored in the database Including,
    The transceiver receives paging for the terminal from a second terminal for forming a communication channel with the terminal and confirms the existence of the terminal in the femtocell based on the presence information of the terminal in the database, If present, paging the terminal within one or more femtocells in the paging area.
  37. 36. The method of claim 35,
    Wherein the first and second base stations have different cell types,
    The information on the movement of the mobile station includes at least one of a mobile station identity (MSID), a paging area identity (PGID), and a base station identity (BSID) LU-REQ (Location Update Request) message,
    The LU-REQ message indicates at least one of movement of a terminal from a femtocell to at least one of a micro cell, a macro cell, and a picocell, and a movement of a terminal from at least one of a micro cell, a macro cell and a picocell to a femtocell Device.
  38. 36. The method of claim 35,
    The 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.
  39. 36. The method of claim 35,
    The first base station is a femtocell base station,
    Wherein the second base station is at least one of a macro cell base station, a microcell base station, and a picocell base station.
  40. 36. The method of claim 35,
    Wherein the information on the movement of the terminal includes information on the terminal entering the femtocell region or information on the terminal departing from the femtocell region.
KR1020090103614A 2008-10-31 2009-10-29 Apparatus and method for managing paging in wireless communication network KR101594392B1 (en)

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KR20150008389A (en) * 2012-05-03 2015-01-22 엘지전자 주식회사 Method of controlling signaling in wireless communication system and device for supporting the method
US9674773B2 (en) 2013-05-09 2017-06-06 Lg Electronics Inc. Method and apparatus for reporting proxy information

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