KR20100119714A - Method for accessing femto cell - Google Patents

Method for accessing femto cell Download PDF

Info

Publication number
KR20100119714A
KR20100119714A KR1020100021654A KR20100021654A KR20100119714A KR 20100119714 A KR20100119714 A KR 20100119714A KR 1020100021654 A KR1020100021654 A KR 1020100021654A KR 20100021654 A KR20100021654 A KR 20100021654A KR 20100119714 A KR20100119714 A KR 20100119714A
Authority
KR
South Korea
Prior art keywords
femtocell
message
ams
base station
location information
Prior art date
Application number
KR1020100021654A
Other languages
Korean (ko)
Inventor
김용호
류기선
박기원
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US17450109P priority Critical
Priority to US61/174,501 priority
Priority to US17579509P priority
Priority to US61/175,795 priority
Priority to US61/180,115 priority
Priority to US18011509P priority
Priority to US18088109P priority
Priority to US61/180,881 priority
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020100021654A priority patent/KR20100119714A/en
Publication of KR20100119714A publication Critical patent/KR20100119714A/en

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters used to improve the performance of a single terminal
    • H04W36/32Reselection being triggered by specific parameters used to improve the performance of a single terminal by location or mobility data, e.g. speed data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/32Hierarchical cell structures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02Services making use of location information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/02Access restriction performed under specific conditions
    • H04W48/04Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information

Abstract

The present invention discloses various methods of accessing a femtocell using a location based service (LBS) and devices supporting the same. In the embodiments of the present invention, the mobile terminal can efficiently access the femtocell using its location information acquired through location information of the femtocell and location-based service measurement. In addition, the network entity may indicate whether to access the femtocell by using the location information of the femtocell and the location information of the mobile terminal. In this case, the location information of the femtocell may include geographic coordinate information of the femtocell and radius information R regarding the peripheral radius of the femtocell.

Description

Method for accessing Femto Cell}

The following description relates to a technique in which a specific femto base station or a specific terminal performs communication in a mobile communication system including a macro base station, one or more femto base stations, and one or more terminals.

A femto base station is a small version of a macro base station, which performs most of the functions of a macro base station, and is a type of base station that may be installed in an area covered by the macro base station or in a shaded area not covered by the macro base station. A femto base station has a network configuration that operates independently and can be installed much more than a relay base station in the city or indoors.

1 is a configuration diagram of a wireless communication system to which a femto base station is added.

As shown in FIG. 1, a wireless communication system to which a femto base station is added includes a femto base station 110, a macro base station, a femto network gateway (FNG) 130, and an access service network (ASN) 140. ) And a connectivity service network (CSN). Macro base station means a general base station of a conventional wireless communication system.

The femto base station 110 operates directly as a macro base station by directly connecting to a Transmission Control Protocol / Internet Protocol (TCP / IP) network and has a coverage of about 0.1 to 30 m, and can be accommodated by one femto base station 110. It is assumed that there are about 10 to 20 terminals. The femto base station 110 may use the same frequency as the macro base station (Intra FA) or may use another frequency (In case of Inter FA).

The femto base station 110 may be connected to the macro base station through an R1 interface to receive a downlink channel of the macro base station, and the femto base station 110 may transmit a control signal to the macro base station.

The femto base station 110 may cover an indoor or shadowed area that the macro base station does not cover and may support high data transmission. The femto base station 110 may be installed in an overlay form in the macro cell, or may be installed in a non-overlay form in an area not covered by the macro base station.

Femto base station 110 is classified into two types. The first type is a Closed Subscriber Group (CSG) femto base station and the second type is an Open Subscriber Group (OSG) femto base station. The CSG femto base station may grant a CSG ID (identification) by grouping terminals accessible to it, and may discriminate when the UE, which has been granted the CSG ID, and the terminal that do not access the CSG femtocell base station. The OSG femtocell base station is a base station to which all terminals can access.

The FNG 130 is a gateway controlling the femto base station 110 and may be connected to the ASN 140 and the CSN 150 through the Rx interface and the Ry interface. The femto base station 110 may receive a service from the CSN 150 through the FNG 230, and the terminal connected to the femto base station 110 may provide functions such as authentication and IMS to the FNG 130 or the CSN 150. You can get the service from.

The CSN 150 provides a terminal with a connection of application services such as the Internet and VoIP, and provides authentication and billing functions. The ASN 140 can control the macro base station and manage the connection between the macro base station and the CSN 150. have.

Meanwhile, the above-described CSG-type femto base station may be classified into two types according to the accessibility of non-member terminals, that is, terminals that have not been assigned a CSG ID.

CSG-closed femto base station (CSG-Closed Femto ABS) is a type that allows access only to member terminals. The terminal may store the CSG closed femto base station identifiers allowed for its access in a white list.

On the other hand, CSG open femto base station (CSG-Open Femto ABS) preferentially supports the service to the member terminals, and if the resources have a type of non-member terminals to allow access. However, service levels for non-member terminals may be differentiated as compared to member terminals.

As described above for the CSG-type femto base station in the mobile communication system using the femto base station, it is assumed that two types according to whether or not to access the non-member terminal are fixed. This can be seen from the partition information in the Advanced Air Interface System Configuration Descriptor message.

Meanwhile, when the macro base station and the femto base station are installed in the same frequency domain, non-member CSG terminals connected to the macro base station may feel interference from neighboring femto base stations. In this case, the macro base station may adjust the interference of the terminal by preventing the femto base station from using a predetermined resource area.

The present invention has been made to solve the problems of the general technology as described above, an object of the present invention is to provide a method for efficiently connecting a mobile terminal to a femtocell and an apparatus for supporting the same.

Another object of the present invention is to provide a method for efficiently accessing a femtocell using a location based service (LBS) measurement result and an apparatus supporting the same.

It is still another object of the present invention to provide a method for efficiently accessing a femtocell using a location information of a nearby base station, a location information of a mobile terminal, and a location information of a femtocell, and an apparatus for supporting the same.

Still another object of the present invention is to provide a method and apparatus for supporting the operation of a femtocell in a low load mode using location information of the femtocell.

Technical objects to be achieved in the present invention are not limited to the above-mentioned matters, and other technical problems which are not mentioned are those skilled in the art from the embodiments of the present invention to be described below. Can be considered.

In order to solve the above technical problem, the present invention provides a method and a device for supporting a specific femto base station or a specific mobile terminal in a mobile communication system including a macro base station, at least one femto base station and at least one mobile terminal. To provide.

According to a first embodiment of the present invention, a method for accessing a femtocell using a location based service (LBS) includes transmitting a first message including a flag requesting location information of a femtocell to a macro base station, and location information of a femtocell. Receiving a second message comprising a from the macro base station, Receiving a third message including the location information of the neighboring base station from the macro base station and Performing location-based service measurement using the location information of the neighboring base station and The method may include accessing the femtocell using the result of the location-based service measurement and the location information of the femtocell. In this case, the location information of the femtocell may include geographic coordinate information of the femtocell and radius information R regarding the peripheral radius of the femtocell.

In the first embodiment, the first message is one of a ranging request message, a registration request message, and a basic capability negotiation request message, and the second message is one of a ranging response message, a registration response message, and a basic capability negotiation response message. Also, the third message may be one of a neighbor base station advertisement message or a location based service advertisement message.

The first embodiment may further include transmitting a measurement result of the location-based service to the base station and receiving a fourth message instructing access to the femtocell from the base station. In this case, the fourth message may be one of an unsolicited ranging response message or an unsolicited scan response message.

The first embodiment may further include transmitting a message including an indicator indicating that the mobile station exists in the radius region of the femtocell to the base station.

Alternatively, the method may further include transmitting a message including an indicator indicating that the mobile terminal exists in a radial area of the femtocell to the femtocell.

In the first embodiment, the location-based service measurement may be performed by a round trip delay time measurement, a U-TDOA, a D-TDOA, or a TOA measurement method.

According to a second embodiment of the present invention, a method for supporting a femtocell connection using a location based service (LBS) includes receiving a first message including a flag requesting location information of a femtocell from a mobile terminal, and a location of a femtocell. Transmitting a second message including information to the mobile terminal; transmitting a third message including location information of a neighboring base station to the mobile terminal; and the position measured using the position information of a neighboring base station from the mobile terminal. And receiving a fourth message including a measurement result of the base service. In this case, the location information of the femtocell may include geographic coordinate information of the femtocell and radius information R regarding the peripheral radius of the femtocell.

In the second embodiment, the first message is one of a ranging request message, a registration request message, and a basic capability negotiation request message, and the second message is one of a ranging response message, a registration response message, and a basic capability negotiation response message. desirable. Also, the third message may be one of a neighbor base station advertisement message or a location based service advertisement message.

The second embodiment includes the steps of: delivering the measurement result of the location-based service to the access service network gateway (ASN-GW); receiving a trigger command message instructing the mobile terminal to search for a femtocell from the access service network gateway; The method may further include transmitting a message instructing the femtocell search to the mobile terminal according to the trigger command message.

The second embodiment may further include transmitting a message including an indicator indicating that the mobile station exists in the radius region of the femtocell to the base station.

In the second embodiment, location-based service measurement may be performed by a round trip delay time measurement, U-TDOA, D-TDOA or TOA measurement.

As a third embodiment of the present invention, a mobile terminal supporting a method for accessing a femtocell using a location based service (LBS) includes a transmission module for transmitting a radio signal, a reception module for receiving a radio signal, and a location based service (LBS). It may include a processor for controlling the femtocell access method using the ().

In this case, the processor transmits a first message including a flag for requesting the location information of the femtocell to the macro base station using the transmission module, and transmits a second message including the location information of the femtocell from the macro base station. Receiving a third message including a location information of a neighboring base station from a macro base station using a receiving module; performing a location based service measurement using a location information of a neighboring base station; The step of accessing the femtocell can be controlled using the result of the service measurement and the location information of the femtocell. In this case, the location information of the femtocell may include geographic coordinate information of the femtocell and radius information R regarding the peripheral radius of the femtocell.

In the third embodiment, the first message may be one of a ranging request message, a registration request message, and a basic capability negotiation request message, and the second message may be one of a ranging response message, a registration response message, and a basic capability negotiation response message. have. Also, the third message may be one of a neighbor base station advertisement message or a location based service advertisement message.

The first to third embodiments are merely some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described below by those skilled in the art. It can be derived and understood based on the detailed description of the invention.

According to the embodiments of the present invention, the following effects are obtained.

First, the mobile terminal can efficiently access the femtocell.

Second, the mobile terminal can efficiently access the femtocell by using the LBS measurement result.

Third, the mobile terminal can efficiently access the femtocell using the location information of the neighboring base station, the location information of the mobile terminal, and the location information of the femtocell.

Fourth, by supporting the operation of the femtocell of the low load mode using the location information of the femtocell, it is possible to improve the processing performance of the mobile terminal and network entities.

Effects obtained in the embodiments of the present invention are not limited to the above-mentioned effects, and other effects not mentioned above are usually described in the technical field to which the present invention pertains from the description of the embodiments of the present invention. Can be clearly derived and understood by those who have That is, unintended effects of practicing the present invention may also be derived from those skilled in the art from the embodiments of the present invention.

1 is a configuration diagram of a wireless communication system to which a femto base station is added.
2 is a diagram illustrating a state in which an idle mode terminal attempts to access a femtocell based on location information of a femto base station as an embodiment of the present invention.
3 is a diagram illustrating another method of accessing a femtocell from an idle mode terminal based on location information of a femtocell according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating still another method for accessing a femtocell from an idle mode terminal based on location information of a femtocell according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating another method of accessing a femtocell from an idle mode terminal based on location information of a femto base station according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a process of performing a handover to a femtocell by using a mobile station in a normal mode using its location information and location information of a femtocell as an embodiment of the present invention.
FIG. 7 is a diagram illustrating a process of performing a handover to a femtocell by using a mobile terminal in a normal mode using its location information and location information of a femtocell as an embodiment of the present invention.
8 is a diagram illustrating an example of a method for accessing a femto base station using a round trip delay time (RTD) based location based service (LBS) as an embodiment of the present invention.
9 is a diagram illustrating an example of a method for accessing a femto base station using a D-TDOA-based location based service (LBS) as an embodiment of the present invention.
FIG. 10 illustrates an example of a method for accessing a femto base station using a U-TDOA-based location based service (LBS) as an embodiment of the present invention.
11 is a diagram illustrating an example of a method for accessing a femto base station using an RTD-based location based service (LBS) as an embodiment of the present invention.
12 is a view showing one of a method for searching a location-based service (LBS) based femtocell as an embodiment of the present invention.
FIG. 13 is a view showing another one of a method for searching a location based service (LBS) based femtocell according to an embodiment of the present invention.
14 is a view showing another one of a method for searching a location-based service (LBS) based femtocell as an embodiment of the present invention.
15 is a view showing a low load mode femtocell operation method using the location information of the CSG femtocell as an embodiment of the present invention.
FIG. 16 is a diagram illustrating one of low load mode femtocell operation processes using location information of a CSG femtocell according to an embodiment of the present invention.
FIG. 17 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell according to an embodiment of the present invention.
FIG. 18 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell according to an embodiment of the present invention.
FIG. 19 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell as an embodiment of the present invention.
20 is a diagram illustrating a mobile station and a base station for implementing the embodiments of the present invention described with reference to FIGS.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a mobile station. Here, the base station is meant as a terminal node of a network that directly communicates with a mobile station. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.

In addition, a 'mobile station' may be a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, an advanced mobile station (AMS) or a terminal. (Terminal), etc. may be substituted.

Also, the transmitting end refers to a fixed and / or mobile node providing data service or voice service, and the receiving end means a fixed and / or mobile node receiving data service or voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents.

In addition, all terms disclosed in the present document can be described by the above standard document. In particular, embodiments of the present invention may be supported by one or more of the standard documents P802.16e-2004, P802.16e-2005, P802.16Rev2, and P802.16m standard documents of the IEEE 802.16 system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

In addition, specific terms used in the embodiments of the present invention are provided to help the understanding of the present invention, and the use of the specific terms may be changed into other forms without departing from the technical spirit of the present invention. .

In the embodiments of the present invention, a femtocell is a term indicating a geographic area managed by a femto base station and may be used in the same individual expression as the femto base station. In addition, the macrocell represents a geographic area managed by the macro base station and may be used in the same individual representation as the macro base station. The term macro base station is used to distinguish a general base station from a femto base station, and a macro base station may mean a base station that is generally used.

Embodiments of the present invention will be described based on the assumption that supporting a location based service (LBS). In the 802.16m system (hereafter 16m), the location determination feature supports AAI-based transmission reporting support to support measurement on wireless downlink and wireless uplink and related entities on the network to determine the location of AMS and / or AMS. Include.

The basic functions of location based service (LBS) are supported by AAI_LBS-ADV message. The AAI_LBS-ADV message is a Media Access Control (MAC) management message broadcast in ABS to provide the AMS with geographical locations of nearby ABSs. The AMS may use the location information about the neighbor base station included in the AAI_LBS-ADV message to determine its location through triangulation or trilateration. The AAI_LBS-ADV message may further include satellite-based (eg, GPS) time and frequency information to improve the performance of the receivers.

In the embodiments of the present invention, it is assumed that the network (eg, HM ABS, FBS, ASN-GW, etc.) knows the position information (coordinate information and radius information) of the CSG femtocell of the AMS in advance. This can be done by FBS sharing its location information with other network entities through a backbone network.

In addition, the AMS and the ASN-GW may previously store CSG information of the AMS. In this case, the CSG information of the AMS may include a CSG identifier (CSG ID), an HM ABS identifier (HM ABS ID), a cell identifier (Cell ID), and CSG femtocell location information.

Hereinafter, the messages used in the embodiments of the present invention will be described.

Table 1 below shows one of a lasing request message format including a request of location information flag.

construction Size (bits) Contents A_RNG-REQ message format () { - - ~ ~ ~ Request of Location Information One If the corresponding flag is set to '1', the macro base station transmits the location information of the CSG femtocell through the A-RNG-RSP to the terminal. ~ ~ ~ } // End of A-RNG-REQ

Referring to Table 1, the location information request flag indicates that the mobile station (AMS) requests location information of the CSG femto base station to which it subscribes. For example, when the location information request flag is set to '1', the home macro ABS may transmit a ranging response message including the femtocell's location information to the mobile station AMS.

If the terminal transmits the ranging request message shown in Table 1 to the femto base station, the femto base station may transmit the ranging response message including the location information of the femtocell.

Table 2 below shows one of ranging response message formats including location information of the femto base station.

construction Size (bits) Contents A_RNG-RSP message format () { - - ~ ~ ~ Coordination information Information about the geographic coordinates of the femtocell Radius of femto cell surrounding area Radius from the center of the femtocell to the surrounding area ~ ~ ~ } // End of A-RNG-RSP

Referring to Table 2, the A-RNG-RSP message includes information on coordinates of the femto base station and information on a radius indicating a predetermined radius from the center of the femtocell to the surrounding area (Radius of femto cell surrounding area: R) may be included. That is, the location information of the femto base station may include coordinate information and radius information of the femto base station.

Table 3 below shows one of the operational trigger TLV parameter formats.

construction Size (bits) Contents Enabled Action Triggered TLV Indicates action performed upon reaching trigger condition
If bit # 0 is set to 1, respond on trigger with MOB_SCN-REP
If bit # 1 is set to 1, respond on trigger with MOB_MSHO-REQ
If bit # 2 is set to 1, on trigger, AMS starts neighboring BS scanning process by sending MOB_SCN-REQ
If bit # 3 is set to 1, on trigger, AMS starts neighbor BS scanning process by sending A-MOB_SCN-REQ for LBS measurement
If bit # 4 is set to 1, on trigger, AMS starts CSG Femto BS scanning process by sending A-MOB_SCN-REQ for its CSG Femto cell discovery

Bit # 5-Bit # 7: Reserved. Shall be set to 0.

Referring to Table 3, the operable trigger TLV indicates an operation to be performed by the AMS. That is, the operable trigger TLV parameter may be expressed in a bitmap format.

For example, bit # 0 of the operable trigger TLV parameter indicates sending a scanning report (MOB_SCN-REP) message, bit # 1 indicates sending a handover request (MOB_MSHO-REQ) message, and bit # 2 indicates Initiate a procedure for scanning neighboring base stations and direct the transmission of a scanning request (MOB_SCN-REQ) message, bit # 3 indicates the transmission of a scanning request message for LBS measurement, and bit # 4 for the CSG femtocell search. The transmission of the scanning request message for scanning the CGS femtocell may be indicated. The remaining # 5 to # 7 may indicate other operations as reserved values.

The operable trigger TLV parameter of Table 3 may be included in an unsolicited ranging response (A-RNG-RSP) message or an unsolicited scan response (A-SCN-RSP) message.

Tables 4 and 5 below show examples of the subscriber station basic performance request (A-SBC-REQ) message format and the subscriber station basic performance response (A-SBC-RSP) message format used in the basic performance negotiation process.

construction Size (bits) Contents A-SBC-REQ message format () { - - ~ ~ ~ Request of Location Information One If the corresponding flag is set to '1', the macro base station transmits the location information of the CSG femtocell through the A-RNG-RSP to the terminal. ~ ~ ~ } // End of A-SBC-REQ

construction Size (bits) Contents A-SBC-RSP message format () { - - ~ ~ ~ Coordination information Information about the geographic coordinates of the femtocell Radius of femto cell surrounding area Radius from the center of the femtocell to the surrounding area ~ ~ ~ } // End of A-SBC-RSP

Tables 6 and 7 show examples of an A-REG-REQ message format and an A-REG-RSP message format used in a network registration process.

construction Size (bits) Contents A-REG-REQ message format () { - - ~ ~ ~ Request of Location Information One If the corresponding flag is set to '1', the macro base station transmits the location information of the CSG femtocell through the A-RNG-RSP to the terminal. ~ ~ ~ } // End of A-REG-REQ

construction Size (bits) Contents A-REG-RSP message format () { - - ~ ~ ~ Coordination information Information about the geographic coordinates of the femtocell Radius of femto cell surrounding area Radius from the center of the femtocell to the surrounding area ~ ~ ~ } // End of A-REG-RSP

For a description of the flags and parameters included in the messages of Tables 4 to 7, refer to the description of Tables 2 and 3. Tables 4 to 7 may be used for the mobile terminal to request and receive location information of the CSG femto base station to which the mobile terminal subscribes in the basic capability negotiation process or the initial registration process in addition to the ranging process.

Table 8 below shows an example of a scanning response message format that can be used in embodiments of the present invention.

construction Size (bits) Contents AAI_SCN-RSP message format () { ~ Scanning type 0b000: Scanning without association
0b001: Scanning with association level 0: association without coordination
0b010: Scanning with association level 1: association with coordination
0b011: Scanning with association level 2: network assisted association
0b100: Scanning of Femtocell BSs
0b101 ~ 0b111: Reserved
~ } // End of AAI_SCN-RSP

Referring to Table 8, if the scanning type parameter is set to 0b000, it indicates scanning without linkage, and if it is set to 0b001, it indicates scanning without adjustment, linkage level 0, and if it is set to 0b010, indicates scanning with adjustment level 1, and linking level 0b011. When set, it indicates scanning of network-assisted associations at association level 2. If set to 0b100, it indicates FBS scanning. Values 0b101 to 0b111 of the scanning type parameter may be set to reserved values.

The scanning response message of Table 8 may be used when the base station informs the scanning operation type of the mobile terminal when the mobile station performs the scanning operation.

Table 9 below shows another example of a ranging response message format that can be used in embodiments of the present invention.

construction Size (bits) Contents A_RNG-RSP message format () { - - ~ ~ ~ Timing Advance (TA) Radius of Femto cell surrounding area (R) Radius from the center of the femtocell to the surrounding area Enabled Action Triggered TLV ~ ~ ~ } // End of A-RNG-RSP

Referring to Table 9, the TA value is ... (need a description of the TA value).

The femtocell radius information R represents the radius from the center of the CSG femtocell to which the AMS subscribes to the surrounding area. In addition, the operable trigger TLV parameter is the same as the parameter described in Table 3. In this case, the TA value and the radius information R may be optionally included in the ranging response message.

Table 10 below shows an example of a paging message format that can be used in embodiments of the present invention.

construction Size (bits) Contents AAI_PAG-ADV Message format () { - - ~  Num-Temp ID Number of temporary identifiers assigned to AMS in the paging group  For (j = 0; j <Num_Temp ID; j ++) {    Temporary ID    Action code 0b00: Perform network re-entry
0b01: Perform ranging to establish location
0b10: Perform LBS measurement
0b11: reserved
 }  ~ } // End of AAI_PAG-ADV

Referring to Table 10, the Num-Temp ID parameter indicates the number of temporary identifiers assigned to the AMS in the paging group, and the Temporary ID parameter indicates an identifier temporarily used until authentication is completed for the network. The operation code indicates an operation to be performed by the mobile terminal.

If the operation code is set to 0b00, the mobile station performs a network reentry process. If it is set to 0b01, the mobile station performs a ranging process for location update. If it is set to 0b10, the mobile station can perform LBS measurement. The 0b11 value may be set to a reserved value.

Embodiments of the present invention described below may be performed using the messages or parameters described in Tables 1 to 10 above.

Femtocell  Location information Based Femtocell  How to connect

2 is a diagram illustrating a state in which an idle mode terminal attempts to access a femtocell based on location information of a femto base station as an embodiment of the present invention.

The location information of the femtocell used in FIG. 2 may include coordinate information indicating the geographic coordinates of the femtocell and radius information (hereinafter, 'R') about the femto cell surrounding area Radius. That is, in the embodiments of the present invention, the AMS can efficiently access the femtocell by using the coordinate information and the radius information R of the femtocell. At this time, the radius information (R) preferably represents a radius larger by a predetermined size than the radius covered by the femtocell.

Referring to FIG. 2, the AMS attempts to access a femtocell supporting a closed service group (CSG) subscribed to the AMS in a serving cell providing a current service. At this time, the macro cell area where the CSG femtocell to which the AMS can access is located is called a home macro cell (HMC) area. That is, the AMS may access the CSG femtocell by performing scanning to find the CSG femtocell near the CSG femtocell region in the HMC region.

The AMS can determine whether the HMC region has approached the CSG femtocell peripheral region by using the femtocell location information. That is, the AMS can identify the exact location of the CSG femtocell using the coordinate information and the radius information (R) of the CSG femtocell.

In the embodiments of the present invention, the AMS uses a super frame header (SFH) broadcast from a serving base station, an HMC macro base station, and a CSG femtocell, a neighbor base station advertisement (AAI_NBR-ADV) message, or additional system information of a CSG femtocell. Location information can be obtained.

In addition, in the form of a unicast message, the AMS transmits a subscriber station performance request (AAI_SBC-REQ) message, a registration request (AAI_REG-REQ) message, or a ranging request (AAI-RNG-REQ) message to the base station (ABS). The base station (ABS) may request the location information of the CSG femtocell through the subscriber station performance response (AAI_SBC-RSP) message, registration response (AAI_REG-RSP) message or ranging response (AAI_RNG-RSP) message. Can send to AMS.

In addition, in embodiments of the present invention, the location information of the femtocell may be assumed to be known in advance in an AMS or a network (ABS, Paging Controller, etc.).

3 is a diagram illustrating another method of accessing a femtocell from an idle mode terminal based on location information of a femtocell according to an embodiment of the present invention.

The method described in FIG. 3 shows that the AMS performs the CSG discovery procedure by directly scanning the location of the CSG femtocell. It is also assumed that AMS is in idle mode.

The terminal (AMS) in the idle mode may move to the HMC region where the CSG femtocell is located (S301).

In the embodiments of the present invention, the idle mode mobile station performs the location update when the paging group is changed, but the AMS assumes that the location update is performed in the macro base station in which the CSG femtocell is subscribed. That is, even if the macro base station belongs to the same paging group, the AMS may perform location update with the macro base station in the HMC including the CSG femtocell.

Accordingly, the AMS may transmit a ranging request (A-RNG-REQ) message to perform a location update (LU) with the HMC base station (S302).

In this case, the AMS may transmit a home macro base station (Mome Macro ABS) including a request of location information flag to request location information of the femtocell in the A_RNG-REQ message (see Table 1).

When the location information request flag is set to '1' in the RNG-REQ message transmitted by the AMS, the HMC ABS provides the ranging response (A-RNG) with the location information including the coordinate information and the radius information (R) of the CSG femtocell. -RSP) is included in the message and transmitted to the AMS (S303) (see Table 2).

The HMC ABS may periodically broadcast a location-based service advertisement message (A-LBS-ADV) to all terminals in the HMC region. At this time, the A-LBS-ADV message may include location information associated with the location of the neighbor base stations (S304).

The AMS may periodically perform a scanning process for location based service (LBS) measurement using location information of neighboring base stations included in the A-LBS-ADV message received from the home macro base station. The AMS may measure its location information based on the LBS measurement result (S305).

The AMS may determine whether the AMS is located in the vicinity of the CSG femtocell by combining the location information of the CSG femtocell received through the A-RNG-RSP with the location information (S306).

If it is determined that the AMS is located around the CSG femtocell, the AMS performs CSG femtocell scanning to discover the CSG femtocell (S307).

If the AMS finds its CSG femtocell during the scanning process, the AMS may send and receive a ranging message (AAI_RNG-REQ / RSP) with the CSG femtocell to perform a location update (LU) process with the CSG femtocell (S309, S310).

FIG. 4 is a diagram illustrating still another method for accessing a femtocell from an idle mode terminal based on location information of a femtocell according to an embodiment of the present invention.

4 illustrates a method in which a network determines whether an AMS enters a peripheral area of a CSG femtocell based on location information of the AMS, and requests a terminal for scanning for discovery of a CSG femtocell. In addition, in FIG. 4, it is assumed that the AMS is in an idle mode.

As the idle mode AMS moves to the home macro cell where the CSG femtocell is located, the AMS may perform location update with the home macro base station HM ABS. At this time, the AMS may request the location information of the CSG femtocell by setting the request of femto cell's location information flag of the A-RNG-REQ message to '1' for location update. In response, the base station transmits an A-RNG-RSP message including the location information (eg, coordinate information and radius information) of the femtocell to the AMS (S401).

HM ABS periodically broadcasts the A-LBS-ADV message including the location information of the neighboring base station to the terminals in its area. In this case, the location information of the neighboring base station may include a geographical coordinate value of the neighboring base station (S402).

The HM ABS may transmit a paging message (eg, A-PAG-ADV) in a paging listening interval of the AMS. At this time, the HM ABS transmits a paging message in which an action code is set to 0b01 (Perform ranging to establish location) and 0b10 (Perform LBS measurement) to '1' (S403) (see Table 3).

In step S403, operation code 0b01 indicates to perform ranging to set the location update, operation code 0b10 indicates to measure the LBS to the terminal. That is, the operation code 0b10 is set to '1' only to the AMS to perform LBS measurement and is transmitted. However, step S403 in FIG. 4 may be omitted according to user requirements or channel environment.

The AMS may perform a scanning process for measuring LBS using the location information of the neighboring base station included in the A-LBS-ADV message received from the HM ABS. The AMS may measure its own location information using the LBS measurement value (S404).

The AMS may perform ranging with the HM ABS according to the operation code 0b01 included in the A-PAG-ADV message received in step S403. At this time, the self-location information obtained based on the LBS measurement result and / or LBS measurement may be transmitted to the HM ABS (S405).

The HM ABS delivers the location information of the AMS obtained from the AMS to the access service network gateway (ASN-GW) (S406).

The ASN-GW compares the location information of the CSG femtocell of the AMS (ie, the coordinate information of the CSG femtocell and the radius information of the femtocell R) with the location information of the AMS acquired in step S406, and whether the AMS has entered the surrounding area of the CSG femtocell. It may be determined (S407).

If it is determined that the AMS enters the peripheral area of the CSG femtocell, the ASN-GW may trigger the discovery of the CSG femtocell in the AMS (S408).

When the HM ABS receives a trigger command for ASG's CSG femtocell search from the ASN-GW, the HM ABS includes an unsolicited A-RNG-RSP (including an enabled action triggered TLV) parameter (see Table 3) to the AMS. The Unsolicited A-RNG-RSP) message may be transmitted to request the AMS to scan for CSG femtocell discovery (S409).

In step S409 of FIG. 4, it is assumed that bit # 4 of the trigger trigger TLV parameter is set to '1' and transmitted. Accordingly, the AMS may send a scanning request message to the HM ABS for CSG femtocell search. In addition, the AMS may perform scanning for CSG femtocell search (S410).

If the CMS femtocell is found in the scanning process, the AMS may perform a ranging process for location update with the CSG femtocell (S411-S413).

FIG. 5 is a diagram illustrating another method of accessing a femtocell from an idle mode terminal based on location information of a femto base station according to an embodiment of the present invention.

In FIG. 5, AMS indicates performing a CSG discovery procedure by directly scanning the location of the CSG femtocell. In this case, it is assumed that the AMS is in the idle mode.

As the AMS in idle mode moves to the HM ABS where the CSG femtocell is located, the AMS performs location update with the HM ABS. At this time, the AMS transmits a ranging request message including a femtocell location information request flag of the A-RNG-REQ message to the MH ABS during location update, and the MH ABS sends a ranging response message including the location information of the CSG femtocell. It can be transmitted to the AMS (S501).

The HM ABS may periodically broadcast an A-LBS-ADV message including location information (eg, coordinate information, etc.) of a neighboring base station to AMS in its area (S502).

The AMS may perform scanning for LBS measurement before performing periodic ranging based on the location information of neighbor base stations included in the A-LBS-ADV message. The AMS may acquire its location information through this scanning process (S503).

The AMS may transmit the location information of the AMS, which is the result of the LBS measurement, to the HM ABS through periodic ranging (S504).

The AMS may determine whether the CSG femtocell has been entered into the area around the CSG femtocell by combining the location information of the CSG femtocell received from the HM ABS through its location information and periodic ranging (S505).

If it is determined that the AMS enters the CSG femtocell periphery area, it may trigger the CSG femtocell search process. Therefore, the AMS may perform scanning for CSG femtocell discovery (S506).

If its CSG femtocell is found in the scanning process, the AMS may perform a ranging process for location update with the CSG femtocell (S507-S509).

FIG. 6 is a diagram illustrating a process of performing a handover to a femtocell by using a mobile station in a normal mode using its location information and location information of a femtocell as an embodiment of the present invention.

Referring to FIG. 6, the mobile station AMS may move to a home macro cell where a CSG femtocell is located and perform a handover process. Accordingly, the AMS may transmit a handover request (A-MOB_MSHO-REQ) message including context information of the AMS to the serving base station (Serving ABS). At this time, the context information of the AMS includes at least one of the AMS MAC address, serving base station identifier (S-ABS ID), serving cell identifier (Cell ID), FBS identifier (FBS ID), HMC identifier (HMC ID) and HM ABS identifier. It may be included (S601).

The serving base station may deliver handover related information to the HM ABS (not shown). In addition, the HM ABS may transmit context information of the AMS to the ASN-GW (S602).

The serving base station sends a handover response (A-MOB_BSHO-RSP) message in response to the handover request message to the AMS (S603), and the AMS indicates a handover indication to the serving base station (A-) to confirm and complete the handover. MOB_MSHO-IND) may transmit a message (S604).

If the AMS does not know the location information of the CSG FBS to which it subscribes, the AMS requests the location information of the CSG FBS from the serving base station at step S601 and obtains the location information of the CSG FBS from the serving base station at step S603. can do. Alternatively, the AMS may acquire the location information of the CSG FBS through the ranging response message transmitted by the base station in the ranging procedure performed in the network reentry process with the HM ABS.

By performing steps S601 to S604, the AMS may perform a handover to the HM ABS in which the CSG femto base station to which it subscribes (S605).

The HM ABS may periodically broadcast the A-LBS-ADV message including the location information of the neighboring base station to the AMS in its area (S606).

The AMS may perform a scanning process for location based service (LBS) measurement using neighboring base station location information included in the A-LBS-ADV message received from the HM ABS. The AMS may acquire its location information through the scanning process (S607).

When the AMS performs periodic ranging, the AMS may transmit a ranging request message including the AMS location information, which is a result of the LBS measurement, to the HM ABS. In this case, the ranging request message may further include a femtocell location information request flag. When the femtocell location information request flag is set to '1' in the A-RNG-REQ message transmitted by the AMS, the HM ABS includes A-RNG-RSP including location information (eg coordinate information and radius information) of the CSG femtocell. Included in the transmission to the AMS (S608).

Step S608 of Figure 6 is preferably performed in the cell area of the ABS where the CSG femtocell of the AMS is located. Therefore, it is preferable that the AMS does not transmit its location information to the corresponding macro base station in the cell area of the ABS without the CSG femtocell.

The HM ABS obtains AMS location information, which is a result of LBS measurement, from the AMS and transmits the AMS location information to the ASN-GW (S609).

The ASN-GW compares the location information of the CSG femtocell of the AMS and the location information of the AMS, and may trigger the CSG discovery process of the AMS when it is determined that the AMS enters the peripheral area of the CSG femtocell (S610, S611).

In the ASN-GW, the proximity of the AMS to the surrounding area of the CSG femtocell is determined by whether the AMS is located in the peripheral radius R where the femto base station is located. The peripheral radius (R) may be used by the AMS or the network without proper negotiation and may be negotiated with each other to optimize the operation. In addition, when the AMS performs network reentry into the FBS, the R value may be negotiated, and the macro base station may broadcast the R value as system information.

If the AMS knows the location information of its CSG FBS in advance, it is not necessary to include the location information of the measured AMS when the AMS performs periodic ranging to the HM ABS. For example, the AMS requests a scanning interval for scanning a femtocell from the CSG femto base station in the vicinity (the radius R) based on its location information measured in step S607 through a scanning request message, and provides a scanning response message. Can be received via Therefore, the AMS can negotiate enough intervals for one CSG femto base station discovery through one scanning interval negotiation. If the CSG femto base station is found early, the negotiated scanning operation may be terminated and reported to the HM ABS.

Referring back to FIG. 6, when the HM ABS receives a trigger command for ASG's CSG femtocell discovery from the ASN-GW, the HM ABS sends an unsolicited A-RNG-RSP message to the AMS to scan the CSG femtocell to the AMS. Can be requested (S612).

In this case, the non-required A-RNG-RSP message format may refer to Table 3. Accordingly, the HM ABS may transmit bit to the AMS by setting bit # 4 of the operable trigger TLV parameter to '1'. That is, the HM ABS may instruct the mobile terminal to start CSG femtocell discovery operation.

In step S612, when the HM ABS transmits the unsolicited ranging response message to the AMS, the HM ABS may allocate the scanning interval in advance so that the AMS can perform the scanning operation and transmit the same to the AMS. In this case, the ABS may transmit bit A5 to AMS by setting bit # 5 of the operable trigger TLV, which is the reserved bit of Table 3, to '1'. In addition, the ABS may transmit a scanning interval TLV parameter indicating a scanning interval. In this case, it is assumed that bit # 5 of the operable trigger TLV indicates that the AMS should perform CSG femtocell scanning with the scanning interval indicated by the given scanning interval TLV parameter. Therefore, the AMS can perform the scanning operation directly without having to send the A-MOB_SCN-REQ to the HM-ABS.

Alternatively, in step S612, the HM ABS transmits an unsolicited scanning response message to the AMS instead of the unsolicited ranging response message, and allocates and transmits an interval in which the AMS can scan the unsolicited scanning response message, thereby transmitting an additional scanning interval. The scanning operation can be performed without negotiation.

Referring back to FIG. 6, the AMS may perform scanning for CSG femtocell discovery based on the parameters received in step S612 (S613).

When the AMS discovers its CSG femtocell through scanning, it may perform handover to the corresponding CSG femtocell (S614-S617).

FIG. 7 is a diagram illustrating a process of performing a handover to a femtocell by using a mobile terminal in a normal mode using its location information and location information of a femtocell as an embodiment of the present invention.

In the embodiment of the present invention described with reference to FIG. 7, unlike FIG. 6, the mobile terminal directly detects a peripheral region of the femtocell to perform scanning for CSG discovery, and when the CSG femtocell is found, handover to the CSG femtocell is performed. A method of doing this is disclosed. However, since steps S701 to S708 in FIG. 7 are similar to steps S601 to S608 of FIG. 6, the description of the corresponding part will be referred to.

The AMS may determine whether the CSG femtocell has entered the area around the CSG femtocell by combining location information of the CSG femtocell received from the HM ABS through periodic location ranging (S709).

If it is determined that the AMS enters the CSG femtocell peripheral region, the AMS may trigger the CSG femtocell search process. Therefore, the AMS may perform scanning for CSG femtocell discovery (S710).

If the AMS detects its CSG femtocell in the scanning process, the AMS may perform a handover process to the CSG femtocell (S711-S714).

2 to 7, the mobile station (AMS) includes a femto base station location information request flag to a macro base station or a femto base station in a ranging process for location update in an idle mode or a periodic ranging process in a normal mode. The operation of transmitting the message and receiving the ranging response message including the location information of the femto base station has been described. However, the femto base station location information request flag and the location information of the femto base station may be transmitted and received between the AMS and the macro base station (ABS) or the femto base station (FBS) in addition to ranging messages in the basic performance negotiation process or network registration process (Table 4). To Table 7).

Round trip delay time RTD Based Femtocell  How to connect

Embodiments of the present invention to be described below assume that the mobile terminal AMS in the normal mode knows the location information of the CSG femtocell in advance.

In embodiments of the present invention, when the AMS performs a network entry procedure to its home macro cell (HMC), the basic capability negotiation process (AAI_SBC-REQ / RSP) or registration process (AAI-REG-REQ / RSP) Through the location information of the CSG femtocell to report to the home macro base station (HM ABS). Through this, the home macrocell (HMC) and the ASN-GW may acquire location information of the CSG femtocell of the AMS.

Alternatively, the network knows in advance the location information of the femto base stations (FBS), and allows the AMS to report the CSG femto base station identifier subscribed to the AMS during the network entry process, so that the network can map the positional relationship between the AMS and the CSG femto base station. Can be.

Alternatively, it may be assumed that both the AMS and the network know the location information of the CSG femto base station subscribed to the AMS.

8 is a diagram illustrating an example of a method for accessing a femto base station using a round trip delay time (RTD) based location based service (LBS) as an embodiment of the present invention.

Referring to FIG. 8, the mobile terminal AMS may move to the home macro cell HMC where the CSG femtocell is located and perform a handover process. Accordingly, the AMS may transmit a handover request (AAI_MSHO-REQ) message including context information of the AMS to the serving ABS. At this time, the context information of the AMS includes the MAC address of the AMS, the serving base station identifier (S-ABS ID), the serving cell identifier (Cell ID), the FBS identifier (FBS ID), the HMC identifier (HMC ID), and the HM ABS identifier (HM ABS). ID) may be included (S801).

The serving base station may deliver handover related information to the HM ABS (not shown). In addition, the HM ABS may transmit context information of the AMS to the ASN-GW (S802).

The serving base station sends a handover response (AAI_BSHO-RSP) message in response to the handover request message to the AMS (S803), and the AMS indicates a handover indication to the serving base station (AAI_MSHO-IND) to confirm and complete the handover. The message may be transmitted (S804).

By performing steps S801 to S804, the AMS may perform a handover to the HM ABS in which the CSG femto base station to which it subscribes (S805).

After performing the handover, the AMS may perform a network reentry procedure to access the HM ABS. That is, the AMS may transmit a ranging request message for initial ranging to the HM ABS and receive a ranging response message including information necessary for network re-entry from the base station (S806).

If the AMS does not know the location information of the CSG FBS to which it subscribes, the AMS may receive the location information of the CSG FBS from the serving base station in step S803. Alternatively, the AMS may receive location information of the CSG femtocell through a ranging response message in a network reentry procedure with the HM ABS. In this case, when the serving base station or the HM ABS transmits location information of the CSG femtocell, the serving base station or the HM ABS may also transmit the radius information R indicating the peripheral radius value of the femto base station FBS.

The AMS may receive the A-NBR-ADV message including the location information of the neighboring base station from the HM ABS. In this case, the location information of the neighboring base station may include geographic coordinate information of the neighboring base station (S807).

The AMS may perform scanning to calculate its location information. Accordingly, the AMS transmits a scanning request (AAI_SCN-REQ) message to the HM ABS in order to perform scanning for the neighboring base station (S808).

The HM ABS sends a scanning response (AAI_SCN-RSP) message in response to the scanning request message of the AMS (see Table 8). The scanning response message may include a report mode parameter indicating a method of reporting a scanning result and a report metric parameter indicating a scanning format. In this case, the report mode parameter may be set to indicate a periodic report (0b01: Periodic report), and the report metric parameter may be set to a bitmap (Bit 3: BS RTD) indicating a round trip delay based report (S809).

The AMS may transmit a ranging request message to the HM ABS and the neighbor base stations, respectively, to measure the round trip delay time (RTD) (S810).

In addition, the AMS may receive a ranging response message (TA_RNG-RSP, see Table 9) including a Timing Advance (TA) value in response to the ranging request message from the HM ABS and neighbor BSs (S811).

The AMS may calculate a downlink round trip delay time (DL RTD) value based on the time at which the ranging response message is received and the TA value (S812).

The AMS may transmit the DL RTD value, which is a result of the measurement in the scanning report (AAI_SCN-REP) message, to the HM ABS (S813).

The HM ABS may obtain location information of the AMS based on the DL RTD value transmitted by the AMS. In addition, the HM ABS delivers the DL RTD values to the access service network gateway (ASN-GW) (S814).

ASN-GW is the location information of AMS CSG femtocell and LBS measurement result based on DL RTD acquired through AMS's basic capability negotiation process (AAI_SBC-REQ / RSP) or network registration process (AAI_REG-REQ / RSP). The location of the AMS may be determined by comparing the location information of the AMS obtained through the step (S815).

The ASN-GW may determine the proximity between the AMS and the CSG femtocell based on whether the AMS is located in the peripheral radius R of the femto base station FBS. The peripheral radius R may be used by the AMS or the network without proper negotiation and may be negotiated for optimization of operation. For example, when the AMS performs network reentry into the HM ABS or the AMS may broadcast the R value as the ABS additional system information.

If the ASN-GW determines that the AMS is adjacent to the CSG femtocell, it may trigger the CSG discovery process (S816).

When the HM ABS receives a trigger command for ASG's CSG femtocell discovery from the ASN-GW, the HM ABS may send an Unsolicited AAI_RNG-RSP message to the AMS. That is, the HM ABS may request the AMS to scan for CSG femtocell discovery (S817).

In this case, it is assumed that the enabled action triggered TLV parameter may be included in the unsolicited ranging response message, and the value of bit # 4 of the operable trigger TLV parameter is set to '1' (see Table 3). ).

The AMS may perform a scanning process for discovering a CSG femtocell, and if a CSG femtocell is found in the scanning process, the AMS may perform handover to the corresponding CSG femtocell (S818-S820).

As another aspect of the present invention described with reference to FIG. 8, when transmitting an unsolicited ranging response message to the AMS in step S817, the HM ABS may allocate and transmit a scanning interval so that the AMS can perform scanning. In this case, the value of bit # 5 of the operable TLV parameter is set to '1'. At this time, it is assumed that the bit # 5 value of the operable TLV parameter indicates that the AMS performs CSG femtocell scanning at the scanning interval indicated by the scanning interval TLV (Scanning Interval TLV) parameter. Accordingly, the HM ABS may include the scanning interval TLV parameter in the unsolicited ranging response message and transmit it to the AMS. In this case, the AMS can perform CSG scanning immediately without having to send AAI_SCN-REQ.

Alternatively, the HM ABS may transmit an unsolicited scanning response message (Unsolicited AAI_SCN-RSP) to the AMS instead of the unsolicited ranging response message in step S817. In this case, the HM ABS may allocate a section to which the AMS can scan in the unsolicited scanning response message and transmit the interval to the AMS so that the AMS can perform scanning without further scanning section negotiation with the HM ABS. In this case, in the embodiment of the present invention, a new scanning type for CSG femtocell scanning is defined, and an unsolicited scanning response message including a new scanning type (Scanning type: 0b100; Scanning of femtocell BS) is sent. Can transmit

As another aspect of the present invention, step S815 may be performed by the HM ABS, not the ASN-GW. For example, the HM ABS may directly trigger the CSG femtocell discovery based on the location information of the AMS and the location information of the CSG femtocell based on the RTD value.

9 is a diagram illustrating an example of a method for accessing a femto base station using a D-TDOA-based location based service (LBS) as an embodiment of the present invention.

Since descriptions of steps S901 to S907 of FIG. 9 are the same as those of steps S801 to S808 of FIG. 8, the description of the corresponding parts will be replaced. However, in case that bit # 4 of the report metric bitmap of the scanning response (AAI_SCN-RSP) message, which is a response to the scanning request message, is set to 1, the scanning type is D-TDOA (Downlink Time Difference Of Arrival). There is a difference (S909).

The AMS scans the HM ABS and neighbor base stations and measures a relative delay value (RD) between the HM ABS and the neighbor base stations (S910).

The AMS transmits an AAI_SCN-REP (Measurement Report) message including the measured relative delay value RD to the HM ABS (S911).

HM ABS can determine the location of the AMS based on the RD value transmitted by the AMS. In addition, the HM ABS delivers the RD values to the ASN-GW (S912).

Subsequently, ASN-GW uses AMS's CSG femtocell using AMS's CSG femtocell's location information acquired during initial AMS network entry or basic capability negotiation process and AMS's location information acquired during LBS measurement process based on D-TDOA. Access to and trigger the ASG CSG femtocell search process. Hereinafter, since the descriptions of the steps S913 to S918 are the same as the descriptions of the steps S815 to S820, the overlapping description will be described with reference to FIG. 8.

FIG. 10 illustrates an example of a method for accessing a femto base station using a U-TDOA-based location based service (LBS) as an embodiment of the present invention.

Since descriptions of steps S1001 to S1007 of FIG. 10 are the same as those of steps S801 to S808 of FIG. 8, the description of the corresponding part of FIG. 8 is replaced with the description. However, since bit # 5 of the report metric bitmap of the scanning response (AAI_SCN-RSP) message, which is a response to the scanning request message, is set to 1, the scanning type is U-TDOA (Uplink Time Difference Of Arrival). There is a difference (S1009).

The AMS scans the HM ABS and neighboring base stations to measure carrier to interference + noise ratio (CINR) and signal-to-interference ratio (SINR) values for each of the HM ABS and the neighboring base stations, and scans the message to the HM ABS. It is possible to report the CINR value and SINR value measured through (S1010).

The AMS may transmit ranging request messages for obtaining a UL RTD to the HM ABS and neighbor base stations, respectively (S1011).

The AMS may receive a ranging response message including a Timing Advance (TA) value in response to the ranging request message from the HM ABS and neighboring base stations (S1012).

Base stations receiving the ranging request message from the AMS may calculate the UL TDOA and exchange measured UL TDOA values between the base stations. In this case, the HM ABS may obtain location information of the AMS based on the measured UL TDOA value (S1013).

The HM ABS may transmit the measured UL TDOA value and the UL TDOA value exchanged with neighboring base stations to the ASN-GW (S1014).

Subsequently, ASN-GW uses AMS's CSG femtocell using AMS's CSG femtocell's location information acquired during initial AMS network entry or basic capability negotiation process and AMS's location information acquired during LBS measurement process based on U-TDOA. Access to and trigger the ASG CSG femtocell search process. Hereinafter, since the descriptions of the steps S1015 to S1020 are the same as the descriptions of the steps S815 to S820, the overlapping description will be described with reference to FIG. 8.

11 is a diagram illustrating an example of a method for accessing a femto base station using an RTD-based location based service (LBS) as an embodiment of the present invention.

11 illustrates a method in which a network determines whether an AMS enters a peripheral area of a CSG femtocell based on location information of the AMS, and requests the AMS for scanning for discovery of a CSG femtocell. In addition, in FIG. 11, it is assumed that the AMS is in an idle mode.

The HM ABS may transmit a paging message (eg, A-PAG-ADV) in a paging listening interval of the AMS. At this time, the HM ABS transmits a paging message in which an action code is set to 0b01 (Perform ranging to establish location) and 0b10 (Perform LBS measurement) to '1'. Paging messages used at this time may refer to Table 10 (S1102).

HM ABS periodically broadcasts the A-NBR-ADV message including the location information of the neighboring base station to the terminals in its area. In this case, the location information of the neighboring base station may include a geographical coordinate value of the neighboring base station (S1103).

The AMS transmits an AAI_SCN-REQ message to the HM ABS to perform scanning for calculating its own location information (S1104).

The HM ABS responds to the AMS with an AAI_SCN-RSP message. In this case, the report mode field included in the AAI_SCN-RSP message may be set to a value indicating a periodic report (0b01), and the report metric field may be set to a value (Bit 3) indicating an RTD. (S1105).

The AMS transmits a ranging request message to the HM ABS and the neighbor base stations, respectively, to calculate the RTD (S1106), and the HM ABS and the neighbor base stations respectively transmit the ranging response message including a TA (Timeing Advance) value to the AMS. It may be (S1107).

The AMS may calculate an RTD value based on a time for transmitting a ranging request message, a time for receiving a ranging response message, and a TA value included in the ranging response message (not shown). Accordingly, the AMS may include the RTD value measured in the AAI_SCN-REP (Measurement Report) message and transmit it to the HM ABS (S1108).

The HM ABS may acquire location information of the AMS based on the RTD value transmitted by the AMS. The RTD values are transferred to the ASN-GW (S1109).

Subsequently, ASN-GW uses AMS's CSG femtocell's location information acquired during initial AMS network entry or basic capability negotiation process and AMS's location information acquired during LBS measurement process based on RTD to ASG's CSG femtocell. Access can be checked and the ASG can trigger the CSG femtocell search process. Hereinafter, since the descriptions of the steps S1110 to S1115 are the same as the descriptions of the steps S815 to S820, the overlapping description will be described with reference to FIG. 8.

In FIG. 11, the HM ABS and / or ASN-GW detects the location information of the AMS based on the Round Trip Delay (RTD) value, but the D-TDOA or U-TDOA described in FIGS. 9 and 10 as well as the RTD value. The value can be used to determine the location information of the AMS.

12 is a view showing one of a method for searching a location-based service (LBS) based femtocell as an embodiment of the present invention.

In FIG. 12, it is assumed that the mobile terminal AMS is in an idle mode. The idle AMS moves to the HM ABS where the CSG femtocell to which it is subscribed is located (S1201).

The AMS may perform location update with the HM ABS (S1202).

The HM ABS delivers information on the AMS and the ABS received through the location update process with the AMS to a paging controller (PC) or an access service network gateway (ASN-GW). In this case, the information delivered to the ASN-GW may include CSG information. That is, the CSG identifier of the AMS, the home macro BSID, the home macro cell ID, the serving BS ID, the serving cell ID, and the terminal MAC address MS MAC Address) and one or more of the AMS location information may be included in the CSG information (S1203).

The paging controller PC may compare the AMS information, the ABS information, and the CSG information received through the location update process with the AMS information and the ABS information (for example, the CSG femtocell information and the home macro base station information) that they have ( S1204).

When the AMS enters the HM ABS region where the CSG femtocell is located, the paging controller may transmit a trigger message to the HM ABS to trigger the LBS measurement to the AMS (S1205).

The HM ABS may periodically transmit the AAI_LBS-ADV message to the AMS in its cell area. In this case, the AAI_LBS-ADV message may include location information (eg, geographic coordinate information) of the neighboring base station (S1206).

The HM ABS may transmit an unsolicited ranging response (Unsolicited AAI_RNG-RSP) message in which bit # 3 of the operable trigger TLV is set to '1' so that the AMS can perform LBS measurement (S1207).

The AMS may perform scanning for the LBS measurement by using the location information of the neighbor base station received in step S1206. The AMS may determine its location using the LBS measurement result (S1208).

The AMS transmits the result of the LBS measurement (TDOA or TOA, etc) to the HM ABS in the A-MOB_SCN-REP message (S1209).

The HM ABS transmits the LBS measurement result received from the AMS to the paging controller (PC) (S1210).

The paging controller may calculate the location information of the AMS based on the LBS measurement result transmitted from the AMS and the HM ABS. In this case, it is assumed that the paging controller already knows the location information of the CSG femtocell of the AMS. Accordingly, the paging controller may determine whether the AMS is located in the peripheral region of the CSG femtocell using the location information of the AMS and the location information of the CSG femtocell (S1211).

If the paging controller determines that the AMS is located in the periphery of the femtocell, the paging controller can trigger the CSG femtocell discovery procedure in the HM ABS so that the AMS can find the CSG femtocell (S1212).

When the HM ABS receives a trigger command for ASG's CSG femtocell discovery from the paging controller, the HM ABS may send an Unsolicited AAI_RNG-RSP message to the AMS. That is, the HM ABS may request the AMS to scan for CSG femtocell discovery (S1213).

In this case, it is assumed that the enabled action triggered TLV parameter may be included in the unsolicited ranging response message, and the value of bit # 4 of the operable trigger TLV parameter is set to '1' (see Table 3). ).

The AMS may perform a scanning process for CSG femtocell discovery, and if its CSG femtocell is found during the scanning process, the AMS may perform location update to the corresponding CSG femtocell (S1214-S1216).

FIG. 13 is a view showing another one of a method for searching a location based service (LBS) based femtocell according to an embodiment of the present invention.

Since steps S1301 to S1306 of FIG. 13 are the same as steps S1201 to S1206 of FIG. 12, the description of the corresponding part will be replaced. Hereinafter, only portions that differ from FIG. 12 will be described.

The HM ABS may transmit a paging message (eg, A-PAG-ADV) in a paging listening interval of the AMS. At this time, the HM ABS transmits a paging message in which an action code is set to 0b01 (Perform ranging to establish location) and 0b10 (Perform LBS measurement) to '1' (S1307).

In step S1307, operation code 0b01 indicates to perform ranging to set the location update, operation code 0b10 indicates to measure the LBS to the terminal. That is, operation code 0b10 is set to '1' only to the AMS to perform LBS measurement and is transmitted (see Table 10).

The AMS may perform scanning for LBS measurement using the location information of the neighbor base station received in step S1306. The AMS may acquire its location information by using the LBS measurement result (S1308).

The AMS transmits the LBS measurement result (TDOA or TOA, etc) and / or its location information in the A-MOB_SCN-REP message to the HM ABS (S1309).

The HM ABS transmits the LBS measurement result received from the AMS to the paging controller (PC) (S1310).

The paging controller may calculate the location information of the AMS based on the location information of the AMS and / or the LBS measurement result transmitted by the HM ABS. In this case, it is assumed that the paging controller already knows the location information of the CSG femtocell of the AMS. Accordingly, the paging controller may determine whether the AMS is located in the peripheral region of the CSG femtocell using the location information of the AMS and the location information of the CSG femtocell (S1311).

If the paging controller determines that the AMS is located in the periphery of the femtocell, the paging controller may trigger the CSG femtocell discovery procedure in the HM ABS so that the AMS can find the CSG femtocell (S1312).

When the HM ABS receives a trigger command for ASG's CSG femtocell discovery from the paging controller, the HM ABS may send an Unsolicited AAI_RNG-RSP message to the AMS. That is, the HM ABS may request the AMS to scan for CSG femtocell discovery (S1313).

In this case, it is assumed that the enabled action triggered TLV parameter may be included in the unsolicited ranging response message, and the value of bit # 4 of the operable trigger TLV parameter is set to '1' (see Table 3). ).

The AMS may perform a scanning process for CSG femtocell discovery, and if its CSG femtocell is found during the scanning process, the AMS may perform location update to the corresponding CSG femtocell (S1314-S1316).

14 is a view showing another one of a method for searching a location-based service (LBS) based femtocell as an embodiment of the present invention.

Referring to FIG. 14, the mobile terminal AMS may perform a handover process as it moves to a home macro cell where a CSG femtocell is located. Accordingly, the AMS may transmit a handover request (A-MOB_MSHO-REQ) message including context information of the AMS to the serving base station (Serving ABS). At this time, the context information of the AMS includes at least one of the AMS MAC address, serving base station identifier (S-ABS ID), serving cell identifier (Cell ID), FBS identifier (FBS ID), HMC identifier (HMC ID) and HM ABS identifier. It may be included (S1401).

The serving base station may deliver handover related information to the HM ABS (not shown). In addition, the serving base station transmits a handover response (A-MOB_BSHO-RSP) message in response to the handover request message to the AMS (S1402), and the AMS indicates a handover instruction to the serving base station to confirm and complete the handover ( A-MOB_MSHO-IND) message can be transmitted (S1403).

After the handover process is completed, the HM ABS may transmit context information of the AMS to the ASN-GW (S1404 and S1405).

The ASN-GW may compare the location information of its own AMS with the information of the ABS based on the context information received from the HM ABS (S1406).

When the AMS moves to the HM ABS where the CSG femtocell is located, the ASN-GW triggers the LSB measurement on the HM ABS to instruct the LMS measurement to the AMS (S1407).

The HM ABS may periodically broadcast the A-LBS-ADV message including the location information of the neighboring base station to the AMS in its area (S1408).

In addition, the HM ABS may request the AMS to scan for CSG femtocell discovery by sending an unsolicited A-RNG-RSP message to the AMS when it receives a trigger command for ASG's CSG femtocell discovery from the ASN-GW ( S1409).

In this case, the non-required A-RNG-RSP message format may refer to Table 3 below. Accordingly, the HM ABS may transmit bit to the AMS by setting bit # 3 of the operable trigger TLV parameter to '1'.

The AMS may perform a scanning process for location based service (LBS) measurement using neighboring base station location information included in the A-LBS-ADV message received from the HM ABS. In this case, since the AMS has bit # 3 of the operable trigger TLV parameter received in step S1409 set to '1', the AMS may start the neighbor base station scanning operation by transmitting an A_SCN-REQ message to the HM ABS. The AMS may acquire its location information through the scanning process (S1410).

In operation S1410, the AMS may perform LBS measurement through a scanning process and acquire location information of the AMS based on the LBS measurement result. Accordingly, the AMS may transmit the result of the LBS measurement (eg, TDOA or TOA, etc.) and / or its own location information in the scanning report (A_SCN-REP) message to the HM ABS (S1411).

The HM ABS may deliver the AMS location information and / or LBS measurement result received from the AMS to the ASN-GW (S1412).

Based on the LBS measurement results, the ASN-GW can determine the location information of the AMS. If the location information of the AMS is directly received from the HM ABS in step S1412, it can be used continuously. It is assumed that the ASN-GW already knows the location information of the CSG femtocell. Accordingly, the ASN-GW may determine whether the AMS enters the peripheral radius R of the CSG femtocell using the location information of the AMS and the location information of the CSG femtocell (S1413).

If the ASN-GW determines that the AMS is located in the peripheral radius (R) of the CSG femtocell, the ASN-GW may trigger the CSG femtocell discovery procedure so that the AMS finds the CSG femtocell (S1414).

If the HM ABS receives a trigger command for ASG's CSG femtocell discovery from the ASN-GW, it may request the AMS to scan the CSG femtocell by sending an unsolicited A-RNG-RSP message to the AMS (S1415). .

In this case, the non-required A-RNG-RSP message format may refer to Table 3. Accordingly, the HM ABS may transmit bit to the AMS by setting bit # 4 of the operable trigger TLV parameter to '1'. That is, the HM ABS may instruct the mobile terminal to start CSG femtocell discovery operation.

The AMS may perform scanning for CSG femtocell discovery based on the parameters received in step S1415. When the AMS discovers its CSG femtocell through scanning, it can perform a handover to the corresponding CSG femtocell (S1416-S1419).

In low load mode (LDM) Femtocell  How it works

The femto base station (FBS) may operate in a low duty mode (LDM) to save power. The low load mode (LDM) of the femto base station (FBS) is composed of Available Interval (AI) and UnAvailable Interval (UAI). In the available section, the FBS may perform operations such as system information transmission, ranging, paging, or data traffic transmission. In non-period (UAI), the FBS does not transmit any signal on the air interface. However, the FBS may be used to synchronize with a macro base station or measure interference from a neighboring base station in an indispensable section.

Hereinafter, a method of operating a femtocell in a low load mode using location information of the CSG femtocell will be described.

15 is a view showing a low load mode femtocell operation method using the location information of the CSG femtocell as an embodiment of the present invention.

Referring to FIG. 15, the AMS may move from a current serving base station to a home macro base station (HM ABS) region including its CSG femtocell. At this time, the handover is performed when the AMS is in the normal mode, and the location update process is performed with the HM ABS when the idle mode is one of the power saving modes.

When the AMS performs the handover, when the AMS enters the network, the AMS may request the location information of the CSG femtocell to which the HSG ABS subscribes. In this case, the HM ABS may inform the AMS of the location information including coordinate information about the geographic coordinates of the CSG femto base station and the radius information R indicating the peripheral radius of the CSG femtocell.

The AMS may periodically perform LBS measurement to acquire its location information. At this time, if it is determined that its location has entered the peripheral area of the CSG femtocell, the AMS may transmit its presence to the MH ABS through various messages. Thus, the HM ABS may request the CSG femtocell to transition from low load mode to normal mode. The CSG femtocell, which is instructed to transition from the HM ABS to the normal mode, may transition from the low load mode to the normal mode. Of course, the AMS may request the FBS to transition from the low load mode to the normal mode directly without going through the HM ABS.

FIG. 16 is a diagram illustrating one of low load mode femtocell operation processes using location information of a CSG femtocell according to an embodiment of the present invention.

Referring to FIG. 16, a mobile station (AMS) in a normal mode may move to a home macro cell (HMC) where a CSG femtocell is located and perform a handover process. Accordingly, the AMS may transmit a handover request (A-MOB_MSHO-REQ) message including context information of the AMS to the serving base station (Serving ABS). At this time, the context information of the AMS includes at least one of the AMS MAC address, serving base station identifier (S-ABS ID), serving cell identifier (Cell ID), FBS identifier (FBS ID), HMC identifier (HMC ID) and HM ABS identifier. It may be included (S1601).

The serving base station may deliver handover related information to the HM ABS (not shown). In addition, the HM ABS may transmit context information of the AMS to the ASN-GW (S1602).

The serving base station sends a handover response (A-MOB_BSHO-RSP) message in response to the handover request message to the AMS (S1603), and the AMS indicates a handover indication to the serving base station (A-) to confirm and complete the handover. MOB_MSHO-IND) may transmit a message (S1604).

The AMS may complete the handover process with the home macro base station (HM ABS) through the process of S1601-S1604 (S1605).

After the AMS completes the handover to the HMC, the AMS may perform a network reentry process with the HM ABS (not shown). At this time, the AMS sets the request of femto cell location information flag to '1' in the ranging request (A-RNG-REQ) message during the initial ranging process with the HM ABS and the CSG femtocell location information. You can request At this time, the base station may inform the AMS of the location information including the coordinate information of the CSG femtocell and the surrounding radius information (R). That is, assume that the AMS does not know the location information of the FBS in FIG.

The HM ABS periodically broadcasts the A-LBS-ADV message including the location information of the neighboring base station to the terminals in its area. In this case, the location information of the neighboring base station may include geographic coordinate information of the neighboring base station (S1606).

The AMS may perform a scanning process for location based service measurement before performing periodic ranging by using the location information of the neighboring base station included in the A-LBS-ADV message received from the base station. The AMS may acquire its own location information through the LSB measurement (S1607).

The AMS may compare the location information of the CSG femtocell with the location information of the AMS acquired in step S1607, and determine whether it has entered the peripheral area of the CSG femtocell (S1608).

If the AMS enters the peripheral area of the CSG femtocell, the AMS may inform its MH ABS of its existence. That is, the AMS may transmit an indication parameter indicating whether it has entered the peripheral area of the CSG femtocell in the ranging request message during periodic ranging with the HM ABS. Alternatively, the AMS may include the indication parameter in a dummy control signal or channel quality information (CQI) report message periodically transmitted to the HM ABS (S1609).

Receiving the indication parameter indicating whether the AMS has entered the peripheral area of the CSG femtocell from the AMS, the HM ABS requests the CSG femtocell of the AMS operating in the low load mode to transition to the normal mode (S1610).

The femto base station operating in the low load mode may transition to the normal mode to perform normal operation with the AMS (S1611).

FIG. 17 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell according to an embodiment of the present invention.

FIG. 17 illustrates a method of inducing a normal mode transition of a CSG femtocell by performing ranging on a possible section of the CSG femtocell without reporting to the macrocell when the AMS enters a peripheral region of the CSG femtocell unlike FIG. 16. will be. Since steps S1701 to S1708 of FIG. 17 are the same as steps S1601 to S1608, a description of the corresponding part will be described with reference to FIG. 16. Hereinafter, different parts from FIG. 16 will be described.

The AMS may compare the location information of the CSG femtocell with the location information of the AMS acquired in step S1707 to determine whether the AMS enters the peripheral area of the CSG femtocell. If the AMS is located in the periphery of the CSG femtocell, the mobile station can transmit a ranging request message including an indication parameter indicating its presence to the CSG FBS in the available interval (AI) of the CSG FBS in the low load mode. (S1709).

The CSG FBS transitions from the low load mode to the normal mode upon receiving the ranging request message including the indication parameter from the AMS. Therefore, the CSG FBS may perform normal mode operation with the AMS (S1710).

FIG. 18 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell according to an embodiment of the present invention.

18 illustrates a case where the AMS is in an idle mode. AMS in idle mode may move to the home macrocell (HMC) where the CSG femtocell to which it is subscribed is located. The AMS in idle mode may perform a location update (LU) process with the HM ABS (S1801).

At this time, the AMS may request the location information of the femtocell that he subscribed to the HM ABS in the location update process. That is, the AMS may transmit the MH ABS by setting a request of femto cell location information flag to '1' in an A-RNG-REQ message (not shown).

When the location information request flag is set to '1' in the A-RNG-REQ message transmitted by the AMS, the HM ABS ranges the femto base station location information including the coordinate information and the radius information (R) of the CSG femtocell. Send to the AMS via a response message (not shown).

In addition, the HM ABS periodically broadcasts an A-LBS-ADV message including location information of nearby base stations to AMSs in its area (S1802).

In addition, the HM ABS may transmit a paging message to the AMS in a paging listening interval of the AMS. At this time, the operation code of the paging message may be set to 0b01 and 0b10 to '1' (see Table 10). At this time, the operation code 0b10 may be set only for the AMS to perform the LBS measurement (S1803).

In embodiments of the present invention, step S1803 may be selectively performed. When step S1803 is performed, the AMS needs to perform only the operation indicated by the operation code of the paging message. Of course, even if there is no paging message, the AMS can perform LBS measurement periodically or at predetermined intervals.

The AMS may perform a scanning process for measuring LBS using the location information of the neighbor base station included in the A-LBS-ADV message received from the HM ABS. The AMS may acquire its location information based on the LBS measurement result (S1804).

The AMS may perform periodic ranging with the femto base station in the pageable period. At this time, the AMS may inform the HM ABS of the location information of the AMS, which is the result of the LBS measurement, in the periodic ranging process (S1805).

The AMS may compare the location information of the CSG femtocell with the location information of the AMS acquired in step S1805 and determine whether the AMS enters the peripheral area of the CSG femtocell (S1806).

If the AMS enters the peripheral area of the CSG femtocell, the AMS may inform its MH ABS of its existence. That is, the AMS may transmit an indication parameter indicating whether it has entered the peripheral area of the CSG femtocell in the ranging request message during periodic ranging with the HM ABS. Alternatively, the AMS may transmit the dummy control signal or channel quality information (CQI) report message periodically transmitted to the HM ABS including the indication parameter (S1807).

Receiving the indication parameter indicating whether the AMS has entered the peripheral area of the CSG femtocell from the AMS, the HM ABS requests the CSG femtocell of the AMS operating in the low load mode to transition to the normal mode (S1808).

The femto base station operating in the low load mode may transition to the normal mode to perform normal operation with the AMS (S1809).

FIG. 19 is a diagram illustrating another operation of a low load mode femtocell using position information of a CSG femtocell as an embodiment of the present invention.

FIG. 19 illustrates a method of inducing a normal mode transition of a CSG femtocell by performing ranging on a possible section of the CSG femtocell without reporting to the macrocell when the idle mode AMS enters the peripheral region of the CSG femtocell unlike FIG. 18. It is about. Since steps S1901 to S1906 of FIG. 19 are the same as steps S1801 to S1806, a description of the corresponding part will be described with reference to FIG. 18. Hereinafter, different parts from FIG. 18 will be described.

In step S1906, the AMS may compare the location information of the CSG femtocell with the location information of the AMS acquired in step S1905, and determine whether the AMS enters the peripheral area of the CSG femtocell. If the AMS is located in the periphery of the CSG femtocell, the mobile station can transmit a ranging request message including an indication parameter indicating its presence to the CSG FBS in the available interval (AI) of the CSG FBS in the low load mode. (S1907).

The CSG FBS transitions from the low load mode to the normal mode upon receiving the ranging request message including the indication parameter from the AMS. Therefore, the CSG FBS may perform normal mode operation with the AMS (S1908).

20 is a diagram illustrating a mobile station and a base station for implementing the embodiments of the present invention described with reference to FIGS.

The mobile terminal may operate as a transmitter in uplink and as a receiver in downlink. In addition, the base station may operate as a receiver in the uplink, and may operate as a transmitter in the downlink.

That is, the mobile terminal and the base station may include a transmission module (Tx module: 2040, 2050) and a receiving module (Rx module: 2050, 2070), respectively, to control the transmission and reception of information, data, and / or messages. And antennas 2000 and 2010 for transmitting and receiving information, data, and / or messages. In addition, the mobile station and the base station each include a processor 2020 and 2030 for performing the above-described embodiments of the present invention and a memory 2080 and 2090 capable of temporarily or continuously storing the processing of the processor. can do.

In particular, the processor 2020, 2030 may be a handover module for performing the handover procedure disclosed in embodiments of the present invention, an encryption module (or means) for encrypting a signal or message to be transmitted and / or an encrypted message. It may further include a decoding module (or means) for interpreting. In addition, the mobile terminal and the base station of FIG. 20 may further include a low power radio frequency (RF) / intermediate frequency (IF) module.

The transmission module and the reception module included in the mobile station and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission. Division Duplex) may perform packet scheduling and / or channel multiplexing.

In addition, the processor included in the mobile terminal and the base station is a MAC (Medium Access Control) according to the control function, handover function, authentication and encryption function, service characteristics and propagation environment for performing the above-described embodiments of the present invention. Frame variable control, high-speed traffic real-time control, and / or real-time modem control.

The apparatus described with reference to FIG. 20 is a means by which the methods described with reference to FIGS. 2 through 19 may be implemented. Embodiments of the present invention can be performed using the components and functions of the above-described mobile terminal and base station apparatus.

The processor 2020 included in the mobile terminal may include a handover module for controlling a handover operation, a power consumption preventing module for performing an idle mode operation, a scanning module for measuring a state of a wireless channel, and the like. .

The mobile terminal controls the above-described handover operation, ranging operation, scanning operation, idle mode operation and / or determination of entry into a femtocell radius region using a processor, and transmits the messages used when performing the operations. And it can transmit and receive using the receiving module.

20 may be used as a component of a femto base station (FBS) as well as a macro base station. If the components of the base station described in FIG. 20 are used in the femto base station, the processor 2030 may control the low load mode (LDM) operation of the femto base station.

In addition, in embodiments of the present invention, a paging controller (PC) and / or an access service network gateway (ASN-GW) may perform embodiments of the present invention as a higher entity of a base station. That is, the PC and / or ASN-GW may operate as an internal higher entity or external higher entity of the base station.

In embodiments of the present invention, the mobile station and the base station may perform the methods described with reference to FIGS. 2 to 19 using the components disclosed in FIG. 20. A transmission module and a reception module are used to transmit and receive a message, and each of the steps and operations can be controlled by the processor of the mobile station and the base station.

On the other hand, in the present invention, the mobile terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, A mobile broadband band system (MBS) phone, a hand-held PC, a notebook PC, a smart phone, or a multi-mode multi-band (MM-MB) terminal may be used.

Here, a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal. have. In addition, a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (eg, Code Division Multiple Access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. For example, software code may be stored in the memory units 2080 and 2090 and driven by the processors 2020 and 2030. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship or may be incorporated as new claims by post-application correction.

Embodiments of the present invention can be applied to various wireless access systems. Examples of various radio access systems include 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.xx (Institute of Electrical and Electronic Engineers 802) systems. Embodiments of the present invention can be applied not only to the various radio access systems, but also to all technical fields to which the various radio access systems are applied.

Claims (20)

  1. In a method for accessing a femtocell using a location based service (LBS),
    Transmitting a first message including a flag for requesting location information of the femtocell to a macro base station;
    Receiving a second message including the location information of the femtocell from the macro base station;
    Receiving a third message including location information of a neighbor base station from the macro base station;
    Performing the location based service measurement using location information of the neighboring base station; And
    And accessing the femtocell by using the result of the location-based service measurement and the location information of the femtocell.
  2. The method of claim 1,
    The location information of the femtocell,
    And a geographic coordinate information of the femtocell and radius information (R) of a peripheral radius of the femtocell.
  3. The method of claim 2,
    The first message is one of a ranging request message, a registration request message and a basic capability negotiation request message.
    And the second message is one of a ranging response message, a registration response message, and a basic capability negotiation response message.
  4. The method of claim 2,
    The third message is,
    A method for accessing a femtocell, which is either a neighbor base station advertisement message or a location based service advertisement message.
  5. The method of claim 1,
    And transmitting the measurement result of the location based service to the base station.
  6. 6. The method of claim 5,
    And receiving a fourth message instructing access to the femtocell from the base station.
  7. The method of claim 1,
    And transmitting a message to the base station, the message including an indicator indicating that the mobile station exists in the radius region of the femtocell.
  8. The method of claim 1,
    And sending a message to the femtocell, the message including an indicator indicating that the mobile terminal exists in a radial region of the femtocell.
  9. The method of claim 1,
    The location based service measurement,
    Round trip delay time measurement, U-TDOA, D-TDOA or TOA, characterized in that performed by the method, femtocell connection method.
  10. In a method for supporting femtocell access using a location based service (LBS),
    Receiving a first message including a flag for requesting location information of the femtocell from a mobile terminal;
    Transmitting a second message including location information of the femtocell to the mobile terminal;
    Transmitting a third message including location information of a neighboring base station to the mobile station; And
    And receiving a fourth message including a measurement result of the location-based service measured by using the location information of the neighboring base station from the mobile terminal.
  11. The method of claim 10,
    The location information of the femtocell,
    And a geographic coordinate information of the femtocell and radius information (R) of a peripheral radius of the femtocell.
  12. 12. The method of claim 11,
    The first message is one of a ranging request message, a registration request message and a basic capability negotiation request message.
    And the second message is one of a ranging response message, a registration response message, and a basic capability negotiation response message.
  13. 12. The method of claim 11,
    The third message is,
    Method of supporting a femtocell access, which is either a neighbor base station advertisement message or a location based service advertisement message.
  14. 12. The method of claim 11,
    Delivering the measurement result of the location based service to an access service network gateway (ASN-GW);
    Receiving a trigger command message instructing the femtocell search from the access service network gateway to the mobile terminal; And
    And sending a message instructing the femtocell search to the mobile terminal according to the trigger command message.
  15. 12. The method of claim 11,
    And transmitting a message to the base station, the message including an indicator indicating that the mobile station exists in the radius region of the femtocell.
  16. 12. The method of claim 11,
    The location based service measurement,
    A round trip delay time measurement, U-TDOA, D-TDOA or TOA measurement method, characterized in that performed by the femtocell connection support method.
  17. In a mobile terminal supporting a method for accessing a femtocell using a location based service (LBS),
    A transmission module for transmitting a radio signal;
    A receiving module for receiving a radio signal; And
    A processor for controlling a method for accessing a femtocell using the location based service (LBS), wherein the processor includes:
    Transmitting a first message including a flag for requesting location information of the femtocell to a macro base station using the transmission module;
    Receiving a second message including location information of the femtocell from the macro base station using the receiving module;
    Receiving a third message including location information of a neighbor base station from the macro base station using the receiving module;
    Performing the location based service measurement using location information of the neighboring base station; And
    And controlling access to the femtocell by using the result of the location-based service measurement and location information of the femtocell.
  18. The method of claim 17,
    The location information of the femtocell,
    A mobile terminal comprising geographic coordinate information of the femtocell and radius information (R) of a peripheral radius of the femtocell.
  19. 19. The method of claim 18,
    The first message is one of a ranging request message, a registration request message and a basic capability negotiation request message.
    And the second message is one of a ranging response message, a registration response message, and a basic capability negotiation response message.
  20. 19. The method of claim 18,
    The third message is,
    A mobile terminal, which is either a neighbor base station advertisement message or a location based service advertisement message.
KR1020100021654A 2009-05-01 2010-03-11 Method for accessing femto cell KR20100119714A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US17450109P true 2009-05-01 2009-05-01
US61/174,501 2009-05-01
US17579509P true 2009-05-06 2009-05-06
US61/175,795 2009-05-06
US18011509P true 2009-05-20 2009-05-20
US61/180,115 2009-05-20
US18088109P true 2009-05-24 2009-05-24
US61/180,881 2009-05-24
KR1020100021654A KR20100119714A (en) 2009-05-01 2010-03-11 Method for accessing femto cell

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100021654A KR20100119714A (en) 2009-05-01 2010-03-11 Method for accessing femto cell
PCT/KR2010/002796 WO2010126344A2 (en) 2009-05-01 2010-05-03 Method for accessing femto cell

Publications (1)

Publication Number Publication Date
KR20100119714A true KR20100119714A (en) 2010-11-10

Family

ID=43032719

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100021654A KR20100119714A (en) 2009-05-01 2010-03-11 Method for accessing femto cell

Country Status (2)

Country Link
KR (1) KR20100119714A (en)
WO (1) WO2010126344A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140024381A (en) * 2011-04-13 2014-02-28 인터디지탈 패튼 홀딩스, 인크 Method and apparatus for small cell discovery in heterogeneous networks
KR101406944B1 (en) * 2007-11-08 2014-06-12 삼성전자주식회사 Apparatus and method for cell measurement in home cell/private connected mode ue

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8737222B2 (en) * 2011-08-18 2014-05-27 Alcatel Lucent Method and apparatus for providing increased small cell resource utilization
GB2502340B (en) 2012-05-25 2014-08-06 Ip Access Ltd Network elements, cellular communication system and methods therefor
WO2014051333A1 (en) * 2012-09-25 2014-04-03 Lg Electronics Inc. Method and apparatus for supporting a control plane and a user plane in a wireless communication system
EP2946587A4 (en) * 2013-01-17 2016-09-28 Intel Ip Corp Centralized partitioning of user devices in a heterogeneous wireless network
US20160037533A1 (en) * 2013-04-25 2016-02-04 Lg Electronics Inc. Method and apparatus for transmitting traffic indication in wireless communication system
US9942810B2 (en) 2013-05-20 2018-04-10 Telefonaktiebolaget Lm Ericsson (Publ) Connection setup for heterogeneous cellular communication networks
EP3099134B1 (en) * 2014-02-18 2018-06-06 Huawei Technologies Co., Ltd. Access system, device and method
US9572108B2 (en) * 2014-06-26 2017-02-14 Intel IP Corporation Systems, methods and devices for small cell activation and detection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8223683B2 (en) * 2007-10-05 2012-07-17 VIA Telecom, Inc Automatic provisioning of femtocell
KR20090037199A (en) * 2007-10-11 2009-04-15 에스케이 텔레콤주식회사 Positioning system in femtocell coverage and method thereof, and femtocell bts applied to the same
US9137745B2 (en) * 2007-10-12 2015-09-15 Qualcomm Incorporated System and method to locate femto cells with passive assistance from a macro cellular wireless network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101406944B1 (en) * 2007-11-08 2014-06-12 삼성전자주식회사 Apparatus and method for cell measurement in home cell/private connected mode ue
KR20140024381A (en) * 2011-04-13 2014-02-28 인터디지탈 패튼 홀딩스, 인크 Method and apparatus for small cell discovery in heterogeneous networks

Also Published As

Publication number Publication date
WO2010126344A2 (en) 2010-11-04
WO2010126344A3 (en) 2011-01-13

Similar Documents

Publication Publication Date Title
US10165481B2 (en) Method and apparatus for adding CSG identities to a white list in connected mode
AU2008322522B2 (en) Using identifiers to establish communication
KR101239717B1 (en) Mobility procedures and differentiated charging in home node-bs
US8750181B2 (en) Maintaining MBMS continuity
EP1964417B1 (en) System and method for integrated wifi/wimax neighbor ap discovery and ap advertisement
KR101150553B1 (en) Method and system for switching a radio access technology between wireless communication systems with a multi-mode wireless transmit/receive unit
KR101083542B1 (en) Small sized base-station and method for controlling operation thereof
US9237477B2 (en) Method and apparatus providing multi-level proximity indication and small cell discovery
AU2008322443B2 (en) Resolving node identifier confusion
US8483709B2 (en) Location update method and mobile station using the same
JP2014532372A (en) User equipment and wireless network nodes and methods for device-to-device communication in them
KR20140024381A (en) Method and apparatus for small cell discovery in heterogeneous networks
US20100130212A1 (en) Femto Cell Handover In Wireless Communications
US20090092097A1 (en) Method and arrangement in a telecommunication system
JP6582076B2 (en) Method and apparatus for selective internet protocol (IP) traffic offload (SIPTO) and local IP access (LIPA) mobility
US20130040640A1 (en) Method for Small Cell Discovery in Heterogeneous Network
KR101091300B1 (en) Server for control plane at mobile communication network and method for controlling Local IP Access Service
US20090316654A1 (en) Access terminal assisted node identifier confusion resolution using a time gap
KR101347680B1 (en) Method of Measurement Reporting and Related Communication Device
JP2008527946A (en) Method and system for system search and user selection
EP1869931B1 (en) Wireless system for communicating heterogeneous network information for performing handover to a network
KR101654139B1 (en) Method and apparatus for managing ue history information at wireless communication network
US8291625B2 (en) Method for transmitting information for inter-radio access technology handover
TWI401928B (en) Mehtod of transmitting and receiving control information of multimode mobile terminal
US20140301371A1 (en) Mobile communication system

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination