KR20100131025A - Method for tracking position based on femto cell and mobile telecommunication system for the same - Google Patents

Method for tracking position based on femto cell and mobile telecommunication system for the same Download PDF

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Publication number
KR20100131025A
KR20100131025A KR1020090049688A KR20090049688A KR20100131025A KR 20100131025 A KR20100131025 A KR 20100131025A KR 1020090049688 A KR1020090049688 A KR 1020090049688A KR 20090049688 A KR20090049688 A KR 20090049688A KR 20100131025 A KR20100131025 A KR 20100131025A
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South Korea
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base station
terminal
indoor base
cell
indoor
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KR1020090049688A
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Korean (ko)
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김영준
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엘지에릭슨 주식회사
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Publication of KR20100131025A publication Critical patent/KR20100131025A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed are a femtocell-based location tracking method and a mobile communication system for tracking a location of a terminal more accurately using an indoor base station for a terminal adjacent to an indoor base station in a mobile communication network. According to the system and method, when the location tracking request of the terminal, the outdoor base station requests the terminal information about the adjacent indoor base station to receive the indoor base station information from the terminal, the MME based on the indoor base station information Keep track of your location. In one embodiment, the indoor base station information is a cell identifier of an indoor base station with a downlink pilot signal superior to the outdoor base station, and in particular, the indoor base station is an indoor base station having a closed subscriber group (CSG) characteristic.

Description

Femtocell based location tracking method and mobile communication system therefor {METHOD FOR TRACKING POSITION BASED ON FEMTO CELL AND MOBILE TELECOMMUNICATION SYSTEM FOR THE SAME}

The present invention relates to a location tracking method based on a femto cell (Home-eNB) and a mobile communication system for the same. More particularly, the present invention relates to an indoor base station in a mobile communication network. The present invention relates to a femtocell-based location tracking method capable of tracking the location of a terminal more accurately using an indoor base station and a mobile communication system therefor.

In general, the wireless communication technology is a wireless mobile communication technology that provides a wireless communication service in a very wide area depending on the range that can provide a communication service, and wireless at a short distance centering around homes, offices, factories, warehouses, and certain complexes. It can be classified into a short range wireless communication technology that provides a communication service.

In the past, short-range wireless communication technology was used for voice communication using a radio or for simple and low-capacity data transmission. However, due to the recent development of digital communication technology and semiconductor technology, various wireless data transmission, wireless control of devices, voice / Various short range wireless communication solutions that can transmit multimedia such as audio / video are being developed and applied. In particular, wireless communication solutions for location recognition of a plurality of objects in a local area network have been developed.

In addition to military purposes, the location of moving objects can be used in the private sector in various forms, such as prevention of lost children, logistics management, sales support management, emergency rescue workers, and operation information provision. to be.

Conventional mobile object tracking is generally based on a global positioning system (GPS) or based on base station location information of a mobile communication network.

GPS, which is a location-based technology using satellite communication, is widely used for tracking the location of an object outdoors due to its wide signal radius and stable service through a fixed satellite, but it has a lot of limitations and power consumption because it has to rely on satellites. The time to first fix (TTFF) is long, and there is a fundamental problem with accuracy in urban and shadow areas due to multipath and lack of visibility satellites.

As is well known, a location tracking system using GPS is a terminal-based method of estimating a location by transmitting a GPS reception signal to a mobile communication network because the mobile communication terminal has a GPS receiver (a terminal must be equipped with a GPS reception module). Can be used), especially indoors (in buildings), and may not work even in dense buildings. In addition, the GPS-based location tracking system has a good relative range over a large area, but has a very low level of repetition for a small area of several tens of meters.

On the other hand, the location tracking method using the mobile communication network transmits a zone number that binds the exchange and several base stations together when registering the location of the terminal from the visitor location register (VLR) to the home location register (HLR). As a result, it was difficult to accurately determine the actual position of the terminal. The location tracking method based on the cell ID has a measurement error of 600 meters to several kilometers depending on the location of the base station (the average base station cell coverage is 1 km), and the accuracy of the cell base station and the measurement method vary widely. have.

An object of the present invention is to provide a femtocell-based location tracking method for accurately tracking the location of a terminal using an indoor base station for a terminal adjacent to an indoor base station in a mobile communication network, and a mobile communication system therefor.

According to an aspect of the present invention, a femtocell-based location tracking method and a mobile communication system for tracking the location of a terminal more accurately using an indoor base station for a terminal adjacent to an indoor base station in a mobile communication network are disclosed. . According to this system and method, when requesting location tracking of a terminal, an outdoor base station requests the terminal for information about an adjacent indoor base station and receives indoor base station information from the terminal, and the MME receives the indoor base station information based on the indoor base station information. Keep track of your location. In one embodiment, the indoor base station information is a cell identifier of an indoor base station with a downlink pilot signal superior to the outdoor base station, and in particular, the indoor base station is an indoor base station having a closed subscriber group (CSG) characteristic. Here, the terminal is located within the coverage of the indoor base station, and the information on the cell that provides the current service according to the request of the outdoor base station, and information about the cell having the best downlink pilot signal among the other cells except the cell for outdoor use Report to the base station.

According to the present invention, there is an advantage that the position can be tracked more accurately by using the indoor base station even for a terminal which cannot be connected to the indoor base station. In addition, accurate positioning can be performed even for a terminal without GPS.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail if they obscure the subject matter of the present invention.

1 is a diagram illustrating a configuration of an exemplary mobile communication network in which the present invention may be implemented.

In one embodiment, the mobile communication network includes, for example, Global System for Mobile communication (GSM), 2G mobile communication networks such as CDMA, LTE networks, wireless Internet such as WiFi, Wireless Broadband Internet (WiBro) and World Interoperability for Microwave Access. Mobile networks that support mobile Internet or packet transfers (e.g., 3G mobile networks such as WCDMA or CDMA2000, 3.5G mobile networks such as High Speed Downlink Packet Access (HSDPA) or High Speed Uplink Packet Access (HSUPA), Or 4G, etc., to be developed in the future, and an outdoor base station (eNB), an indoor base station (Home-eNB), and any other mobile communication network including a UE as a component, but is not limited thereto.

In recent years, the mobile communication network has been proposed to provide a mobile communication service by installing a small mobile communication base station indoors to access a mobile communication core network through an indoor broadband network as the demand for mobile phones and mobile data continues to increase at home. It is becoming. Such a small mobile communication base station is called an indoor base station or a femto base station.

As shown in FIG. 1, a mobile communication network may be composed of one or more network cells, and different types of network cells may be mixed in the mobile communication network. The general LTE network structure is an indoor base station (home-eNB) (11-15, 21-23, 31-33) that manages a narrow range of network cells (hereinafter, referred to as 'femtocells') indoors and a wide range outdoors. Outdoor base station (eNB) (10, 20, 30), terminal (UE) 40, SON (Self Organizing & Optimizing Networks) server (not shown) And MME 80 and the like. The number of each component shown in FIG. 1 is exemplary, and the number of each component of the mobile communication network to which the present invention may be implemented is not limited to the number shown in the drawings.

As such, the network cells constituting the mobile communication network may include an outdoor base station cell (macrocell) and an indoor base station cell (femtocell). The macrocell may be managed by the outdoor base stations 10, 20, 30, and the femtocell may be managed by indoor base stations 11-15, 21-23, 31-33.

The indoor base stations 11 to 15, 21 to 23, 31 to 33 and the outdoor base stations 10, 20 and 30 may each independently have connectivity to the core network.

The outdoor base station (eNB) 10, 20, 30 can be used in, for example, LTE network, WiFi network, WiBro network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc. It may include a feature of the macro cell base station for managing a cell having, but is not limited thereto.

Indoor base stations (Home-eNB) 11 to 15, 21 to 23, 31 to 33 may be used in, for example, LTE networks, WiFi networks, WiBro networks, WiMax networks, WCDMA networks, CDMA networks, UMTS networks, GSM networks, and the like. Which may include, but is not limited to, for example, features of a femtocell base station managing a cell having a radius of about several tens of meters.

Indoor base stations 11 to 15, 21 to 23, 31 to 33 are base stations installed in homes, businesses, etc., and are designed to be small in size and simple to be easily installed indoors, such as existing wireless access points (APs). . Indoor base stations (11 to 15, 21 to 23, 31 to 33) are installed in homes individually and used in homes, and indoor base station groups for companies that are installed in groups and used by companies. There is this.

'Home subscriber' refers to a subscriber of the terminal 40 registered in the group subscriber information DB of the indoor base stations 11-15, 21-23, 31-33. At this time, the terminal 40 moves from the outdoor base station (10, 20, 30) to the area of the indoor base station (11-15, 21-23, 31-33) (outdoor → indoor handover), or indoor Move from the area of the indoor base stations 11-15, 21-23, 31-33 to the area of another indoor base station (indoor-to-indoor handover), or the indoor base stations (11-15, 21-23, 31). It is possible to move (from indoor to outdoor handover) to the area of the outdoor base stations 10, 20, and 30 in the area of ~ 33). The 'general subscriber', which is distinguished from the home subscriber, enters the indoor base station (11 ~ 15,21 ~ 23,31 ~ 33) installation area, but the group of indoor base stations (11 ~ 15,21 ~ 23,31 ~ 33) It means a subscriber of the terminal 40 not registered in the subscriber information DB.

Hereinafter, the indoor base stations 11 to 15, 21 to 23, 31 to 33 should be interpreted as concepts including both indoor indoor base stations and corporate indoor base station groups, and the terminal 40 is an indoor / outdoor base station. 3G / 4G subscriber station (UE: User Equipment) operating in a mobile communication system configured as.

Subscriber management methods in indoor base stations 11-15, 21-23, 31-33 are largely proposed by OSG (Open Subscriber Group) and CSG (Closed Subscriber Group). The OSG method allows free access to all terminals as in the general outdoor base stations 10, 20, and 30, but the CSG method can access only specific terminals allowed to access in advance. The OSG method is used for public network purposes, accessible to all users, and used for coverage extension. The CSG method is used for private network use and is set to be accessible only to specific subscribers. In addition, as part of the CSG scheme, there is a "Partial" scheme that is set to be accessible only to some subscribers in a specific region such as a university / company. Detailed description of the subscriber management method of the indoor base station (11 ~ 15, 21 ~ 23, 31 ~ 33) will be described later.

Various methods have been proposed as a network interface structure for accommodating indoor base stations 11-15, 21-23, 31-33. For example, through a secure gateway 60 through a high-speed Internet in a home, the structure connects to the RNC / MME of a mobile communication network, and moves through a device called a concentrator (node that accommodates multiple Home eNBs) that performs RNC functions. Various structures are being considered, such as a structure for connecting to an SGSN / MME of a communication network and a structure for connecting to an IMS (IP Multimedia System) network through a SIP gateway. Among them, FIG. 1 is a form of minimizing modification of an existing network (3G network), and schematically illustrates a structure for accessing a mobile communication network through an ISP (Internet Service Provider) network in a general home using high-speed Internet service. .

An example of a structure for connection between indoor base stations 11 to 15, 21 to 23, 31 to 33 and a mobile communication network node will be described with reference to FIG. 1.

Indoor base stations 11 to 15, 21 to 23, 31 to 33 are about the same size as DSL routers and cable modems, and are extremely small compared to outdoor base stations. The frequency used is a licensed frequency band allocated to a mobile operator, and can operate in an unlicensed frequency band. The output voltage is usually about 10 ~ 100mW and covers an area of about 50 ~ 100m radius. In addition, indoor base stations (11 to 15, 21 to 23, 31 to 33) are base stations with minimal S / W and H / W capabilities compared to outdoor base stations (10, 20, 30). Can be installed and installed directly by a network operator or user. The connection with the mobile communication core network may be connected to a separate communication network connecting the indoor base stations 11-15, 21-23, 31-33, or may be connected through a high-speed internet installed indoors (for example, a digital subscriber). Connected via a line (DSL) 50).

Indoor base stations (11-15, 21-23, 31-33) of each home use an IP-based standardized 3GPP Iub interface through a secure gateway 60 between the Internet (eg, ADSL, etc.) and a mobile communication network. RNC (Base International Controller) 70 / MME (node accepting SGSN and GGSN functions in EPS system) 80 is connected, and Iub signaling messages are tunneled to Secure Gateway 60 through IP Encapsulation. . That is, the structure of FIG. 1 is a method in which the Iub protocol is encapsulated in IP and connected. Network Security is covered in the IP Security (IP Sec) protocol.

This structure requires the RNC 70 to accommodate numerous indoor base stations 11-15, 21-23, 31-33. Although not shown in the figure, in order to solve the problem that the RNC 60 has to accommodate numerous indoor base stations 11-15, 21-23, 31-33, there are a number of devices called Concentrators that perform the functions of the RNC. It is used to connect with the indoor base station (11 ~ 15, 21 ~ 23, 31 ~ 33) of, which can be connected to the SGSN 70 and MME 80 of the mobile communication core network. In addition, although not shown in the drawing, indoor base stations 11-15, 21-23, 31-33 serve as UMA clients, RNC functions are provided by a UMA Network Controller (UNC), and UNC is a core network node SGSN ( 70), MME (80) or the like. In addition, based on SIP / IMS, the indoor base stations (11-15, 21-23, 31-33) are equipped with the SIP protocol and the indoor gateways (11-15, 21-23, 31-33) through the SIP gateway. ) May be connected to a 3GPP IMS-based network.

It should be noted that the present invention is not limited to the structures for the connection between the indoor base stations 11 to 15, 21 to 23, 31 to 33 and mobile communication network nodes.

In an LTE network, access to an outdoor base station cell (macro cell) is allowed to all terminals 40, but access to an indoor base station cell (femtocell) may be restricted to a specific terminal (subscriber). Specifically, indoor base stations 11 to 15, 21 to 23, 31 to 33 may broadcast system information block type 1 (SIB 1), which is information about a femtocell managed by the indoor base station (11 to 15, 21 to 23, 31 to 33). A Closed Subscriber Group indicator is included to indicate whether access to the femtocell is restricted. If the CSG indicator in SIB 1 broadcast by the indoor base stations 11-15, 21-23, 31-33 has a value of 'true', a closed type can be accessed only by a particular subscriber to that femtocell. Communication is performed in a closed manner (CSG: Closed Subscriber Group), and having a value of 'False' is performed in an open manner in which all subscribers can access the femtocell (OSG: Opened Subscriber Group). If the CSG indicator has a value of 'true', the terminal 40 may access the femtocell only when it is confirmed that the femtocell is included in the white list, which is a list of femtocells accessible by the CSG indicator.

CSG means a group of indoor base stations with specific attributes. All indoor base stations belonging to this group (CSG) allow access only to the terminal 40 to which access is allowed. Indoor base stations having CSG characteristics (eg, 11 to 13, 21, 22, and 31) are referred to as 'CSG base stations'. OSG means a group of indoor base stations to which all the terminals 40 can be connected. All indoor base stations belonging to this group (OSG) allow access to all terminals 40. Indoor base stations with OSG characteristics (eg, 14, 15, 23, 32, 33) are referred to as 'OSG base stations'. Although a general subscriber cannot access a CSG base station that can be accessed only by a home subscriber, in the present invention, even a general subscriber affected by a macrocell is more precisely positioned using a femtocell of an indoor base station (strictly a CSG base station). We want to provide a tracking service. When the home subscriber accesses the CSG base station or the general subscriber accesses the OSG base station, the location of the terminal 40 may be tracked based on the indoor base station (CSG base station or OSG base station). However, since the general subscriber cannot access the CSG base station even if it is within the coverage of the CSG base station, the location of the terminal 40 can only be tracked based on the outdoor base station 10 or 20 or 30.

The terminal 40 belonging to the femtocell managed by the indoor base stations 11 to 15, 21 to 23, 31 to 33 has an indoor base station ID called a white list, and only to an indoor base station belonging to the white list. It is possible to connect and no connection is allowed to other indoor base stations. For example, in a femtocell, assuming indoor base stations 11 to 13, 21, 22, and 31 as 'CSG base stations' and indoor base stations 14, 15, 23, 32, and 33 as 'OSG base stations', OSG base stations 14,15,23,32,33 become indoor base stations belonging to the white list. Accordingly, the OSG base stations 14, 15, 23, 32, and 33 may be connected to all the terminals 40, but only the terminals 40 permitted to access the CSG base stations 11 to 13, 21, 22, and 31 may be connected. Connection is possible.

For example, the procedure of the terminal 40 accessing an indoor base station (eg, 21) is as follows. The terminal 40 may know whether access to the femtocell is restricted based on the CSG indicator of the SIB 1 broadcast by the indoor base stations 11 to 15, 21 to 23, 31 to 33. In addition, an identifier for identifying the indoor base station cell by the terminal 40 includes a physical layer cell identifier (PCI), which is a cell classification factor in the physical layer, and a global cell identifier, which is a unique cell identification factor in a mobile communication network. (CGI: Cell Global Identity), Tracking Cell Identifier (TAI: Tracking Area Identity) which is a tracking cell classification factor. The cell identifier is included in SIB 1 broadcast by the indoor base stations 11-15, 21-23, 31-33. In an embodiment, when the terminal 40 detects that the access base station 21 is the outdoor base station 20, the outdoor base station 20 received the detection of the detection of the indoor base station 21 from the terminal 40 is The terminal 40 is instructed to read the SIB 1 received from the detected indoor base station 21 and report the cell identifier (PCI or CGI or TAI, etc.) of the indoor base station 21, and the terminal 40. ) Determines whether the terminal 40 is accessible to the detected indoor base station 21 based on the cell identifier and the white list. If it is determined that the terminal 40 is accessible to the detected indoor base station 21, the mobile station permits handover to the indoor base station 21.

In the macrocell, the characteristics of the OSG base stations 14, 15, 23, 32, 33 and CSG base stations 11-13, 21, 22, 31 of the lower femtocells are preset, and the indoor base stations 11-15, Information (OSG base station, CSG base station) on the characteristics of 21 to 23, 31 to 33 is stored and managed by the SON server or the MME 80.

The UE 40 is used in 2G mobile communication networks such as GSM networks, CDMA networks, wireless Internet networks such as LTE networks, WiFi networks, mobile Internet networks such as WiBro networks and WiMax networks, or mobile communication networks supporting packet transmission. It may include features of the wireless mobile terminal, but is not limited thereto. In one embodiment, terminal 40 may be a macrocell subscriber station and / or a femtocell subscriber station.

The SON server may include any server that functions to perform outdoor / indoor base station installation and optimization and to provide the basic parameters or data required for each base station. The MME 80 may include any entity used to manage handover management, call processing, and the like of the terminal 40. In one embodiment, one network management device may perform both the functions of the SON server and the MME 80, and the MME 80 may perform all the functions of the SON server. The SON server and the MME 80 may manage one or more outdoor base stations 10, 20, 30 and one or more indoor base stations 11-15, 21-23, 31-33.

In the mobile communication network, a macro cell and a femto cell are assumed to be mixed, but the network cell may be configured only by the macro cell or the femto cell.

Indoor base station (11 ~ 15,21 ~ 23,31 ~ 33) is a equipment that provides wireless communication by using wired / wireless, using xDSL network used in existing home as a backhaul. The representative technical report is 3GPP TR 23.830 "Architecture aspects of Home NodeB and home eNodeB". The indoor base stations 11 to 15, 21 to 23, 31 to 33 are grouped to have a structure managed by the secure gateway 60, and the secure gateway 60 is an MME 80 // of a core network. It is associated with a Serving Gateway 80. As described above, the femtocells managed by the indoor base stations 11 to 15, 21 to 23, 31 to 33 may exist in a large number in the macro cell managed by the outdoor base stations 10, 20 and 30.

In order to help the understanding of the present invention, the terminal 40 according to the state (Active, Idle) of the terminal 40 and the selected cell (outdoor base station or indoor base station) to which the terminal 40 is accessible. The location tracking procedure (general location tracking procedure) will be described separately.

Location tracking of the terminal 40 is used to determine the location of the specific terminal 40, this function can be supported regardless of the state (activation, deactivation) of the terminal 40. In FIG. 2 and FIG. 3, a base station (NB) includes both an outdoor base station (eNB) 10, 20, and 30 and an indoor base station (Home-eNB) 11 to 15, 21 to 23, 31 to 33. do.

Referring to the location tracking procedure of the terminal 40 having the active state (LTE_ACTIVE) with reference to Figure 2, when the operator's location reporting request, the MME 80 sends a Location Reporting Control message to the base station (outdoor base station, indoor base station) send. At this time, the Request Type information is displayed in the Location Reporting Control message. The Request Type information includes a request to report a cell currently providing a service to the terminal 40 (Direct: Current Cell) and whenever the terminal 40 moves. Report of a cell providing a service to be changed (Change of Serving Cell: New Serving Cell).

The base station (outdoor base station, indoor base station) transmits a Location Report to the MME 80 according to the Request Type in the Location Reporting Control message. For example, a base station (outdoor base station, indoor base station) reports a cell (Current Cell) currently providing a service to the terminal 40 to the MME 80, or provides a service that changes every time the terminal 40 moves. The cell (New Serving Cell) is reported to the MME 80.

Referring to the location tracking procedure of the terminal 40 having an inactive state (LTE_IDLE) with reference to FIG. 3, upon requesting an operator's location report, the MME 80 transmits paging to activate the terminal 40. . The terminal 40 receiving the paging is activated.

The MME 80 transmits a Location Reporting Control message to the base station (outdoor base station, indoor base station), and the base station (outdoor base station, indoor base station) sends the location report to the MME 80 according to the request type in the location reporting control message. Send. When reporting a location report, a base station (outdoor base station, indoor base station) reports a current cell (Current Cell) providing a service to the terminal 40 to the MME 80, or a service that changes every time the terminal 40 moves Report the serving cell (New Serving Cell) to the MME (80).

The MME 80 receiving the location report deactivates the terminal 40.

This location tracking service can be used for friend search or emergency disaster.

As described above, the OSG base station can access not only the home subscriber but also the general subscriber, but the CSG base station can connect only the home subscriber and not the general subscriber.

Therefore, since the indoor base station (including the OSG base station, CSG base station) does not exist around the terminal 40 of the general subscriber as shown in FIG. 4, only an access through the outdoor base station 10 or 20 or 30 is possible, or the terminal of the general subscriber. There are indoor base stations 11-15, 21-23, 31-33 around 40, but this indoor base station is a CSG base station (e.g., any of 11-13,21,22,31) and is a home subscriber. Only the user can connect and the general subscriber cannot access the terminal 40 of the general subscriber should be connected through the outdoor base station (10 or 20 or 30). In this case, when the operator requests the terminal location tracking, the terminal 40 selects the outdoor base station 10 or 20 or 30 of the macro cell, so that the cell identifier (PCI or CGI or or) of the outdoor base station 10 or 20 or 30 is selected. TAI) is reported to the MME 80.

Meanwhile, as shown in FIG. 5, the terminal 40 of the general subscriber exists in the cell (femtocell) area of the indoor base station (OSG base station), and the terminal 40 of the general subscriber accesses through the OSG base station, or the terminal of the home subscriber ( 40 may exist in a cell (femtocell) region of an indoor base station (CSG base station) and a terminal 40 of a home subscriber may access through a CSG base station. In this case, when the operator requests the location of the terminal, the terminal 40 selects the indoor base station of the femtocell, and thus reports the cell (PCI or CGI or TAI) of the indoor base station to the MME 80. However, when the general subscriber station 40 exists in the cell (femtocell) region of the indoor base station (CSG base station) but cannot access through the CSG base station, the general subscriber station 40 is the outdoor base station 10 or 20 or You must connect via 30). In this case, when the operator requests the terminal location tracking, the terminal 40 selects the outdoor base station 10 or 20 or 30 of the macro cell, so that the cell identifier (PCI or CGI or or) of the outdoor base station 10 or 20 or 30 is selected. TAI) is reported to the MME 80.

Hereinafter, even for a general subscriber who cannot access an indoor base station in a mobile communication network (when an indoor base station exists near the terminal 40 of the general subscriber but the CSG base station is not an OSG base station), more accurate location tracking using the CSG base station Let's look at how to provide services.

6 is a diagram illustrating a configuration of a mobile communication network for a location tracking procedure of a terminal according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating a femtocell-based location tracking method according to an embodiment of the present invention. .

When the operator requests a location report, the MME 80 transmits a Location Reporting Control message (see FIG. 8) to the outdoor base stations 10, 20, and 30 to request the location of the terminal 40 to be reported. This assumes that the terminal 40 is activated. If the terminal 40 is not activated (that is, deactivated), the MME 80 transmits paging to the terminal 40 to transmit the paging to the terminal 40. The procedure for activating is performed first.

Here, the Location Reporting Control message includes Request Type information as shown in FIG. 8. In one embodiment, the Request Type information includes a cell currently providing a service to the terminal 40 and other than this cell. Among the cells, the downlink (Downlink) pilot signal (Pilot) signal to report the best cell (Direct: Current Cell), and the service that changes each time the cell in service by the movement of the terminal 40 is changed to provide The cell and a change of serving cell (New Serving Cell) to report a cell having the best downlink pilot signal among other cells except this cell is included. In one embodiment, the downlink pilot signal is a non-MBSFN (Multicast / Broadcast over a Single Frequency) among downlink RSs (defined as three types of Cell-specific RS, MBSFN RS, and UE-specific RS). Network) Cell-specific RS related to transmission.

Upon receiving the Location Reporting Control message, the outdoor base station 10, 20, 30 transmits a Location Report (see FIG. 9) to the MME 80 according to the Request Type in the Location Reporting Control message. When the Location Report is reported (7a in FIG. 7), the outdoor base stations 10, 20, and 30 are configured to provide a current cell (Current Cell) and a downlink pilot signal among other cells except this cell. A new serving cell that reports the best cell to the MME 80 or changes every time the terminal 40 moves, and a downlink pilot signal among other cells except this cell The best cell is reported to the MME 80.

Here, the location report message includes the E-UTRAN position information as shown in FIG. 9. In one embodiment, the position information includes information on a cell currently providing a service to the terminal 40 (Current Cell). Information about, for example, E-UTRAN CGI / TAI) and information on a cell having the best downlink pilot signal among other cells except this cell (information on Best Cell, such as E-UTRAN CGI / TAI). Direct: Current Cell]. In addition, information on a cell providing a service that is changed every time a cell in service is changed by the movement of the terminal 40 (information on a current cell, for example, E-UTRAN CGI / TAI), and other than this cell Among the cells, information on a cell having the best downlink pilot signal (information on Best Cell, for example, E-UTRAN CGI / TAI) is included [Change of Serving Cell: New Serving Cell]. In one embodiment, the downlink pilot signal is a Cell-specific RS of the Downlink RS.

As shown in FIG. 6, an OSG base station (eg, any one of 14,15,23,32,33 in FIG. 1) or a CSG base station (eg , 11 to 13, 21, 22, and 31, such as indoor base station does not exist, the terminal 40-1 can be connected only through the outdoor base station (10 or 20 or 30). For example, assume that the terminal 40-1 is located within the coverage of the outdoor base station 20. In this case, since the terminal 40-1 of the general subscriber does not currently have indoor base stations 11-15, 21-23, 31-33, the cell identifier (CGI //) of the outdoor base station 20 to which the general subscriber is connected. Only the TAI) to the outdoor base station 20 (7b of FIG. 7). That is, the terminal 40-1 reports only the cell identifier (CGI / TAI) of the outdoor base station 20 for the current cell to the outdoor base station 20.

However, an indoor base station (OSG base station, CSG base station) may exist around the terminal 40-2 (UE_2) of the general subscriber. For example, suppose that the terminal 40-2 is located within the coverage of the indoor base station 21, which is a CSG base station. Within the coverage of the indoor base station 21, the downlink pilot signal of the indoor base station 21 is superior to the downlink pilot signal of the outdoor base station 20. In this case, the terminal 40-2 is a downlink among the CGI / TAI of the outdoor base station 20 to which it is connected regardless of whether the indoor base station (CSG base station) is connected, and other cells except for the outdoor base station 20. The information on the cell having the best link pilot signal (that is, the information on the indoor base station 21) is reported to the outdoor base station 20 (7b of FIG. 7). At this time, the reported information is the cell identifier (CGI / TAI) of the outdoor base station 20 for the current cell and the cell identifier (CGI / TAI) of the indoor base station 21 for the best cell to the outdoor base station 20. Is reported. At this time, the cell identifier of the indoor base station 21 for the best cell is a cell identifier (PCI or CGI) of the indoor base station 21 by reading the SIB 1 received from the indoor base station 21 by the terminal 40-2. or TAI) to the outdoor base station 20.

The outdoor base station 20 transmits a location report to the MME 80, and the MME 80 determines the location of the terminal 40 based on the cell identifier of the indoor base station 21 for the best cell indicated in the location report message. Make a more accurate estimate.

Although the present invention has been described in connection with some embodiments thereof, it should be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention as understood by those skilled in the art. something to do. It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

1 illustrates a configuration of an exemplary mobile communication network in which the present invention may be practiced.

2 is a diagram illustrating a location tracking procedure of a terminal in an activated state.

3 is a diagram illustrating a location tracking procedure of a terminal in an inactive state.

4 is a diagram illustrating a macro cell-based terminal location tracking procedure.

5 is a diagram illustrating a femtocell-based terminal location tracking procedure.

6 is a diagram illustrating a configuration of a mobile communication network for a location tracking procedure of a terminal according to an embodiment of the present invention.

7 is a diagram illustrating a femtocell-based location tracking method according to an embodiment of the present invention.

8 is a diagram illustrating a Location Reporting Control message used in the present invention.

9 illustrates a Location Report message according to one embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10,20,30: outdoor base station (eNB)

11 ~ 15,21 ~ 23,31 ~ 33: Indoor base station (Home-eNB)

40: UE (UE) 50: digital subscriber line (DSL)

60: Secure Gateway 70: RNC / SGSN

80: MME / Serving Gateway

Claims (14)

As a location tracking method of mobile communication network, When the location tracking request of the terminal, the outdoor base station requests the terminal information about the neighboring indoor base station to receive the indoor base station information; And Location tracking method comprising the step of tracking the location of the terminal based on the indoor base station information. The method of claim 1, And the indoor base station information is a cell identifier of an indoor base station with a downlink pilot signal superior to the outdoor base station. The method of claim 2, The indoor base station is a femtocell base station having a closed subscriber group (CSG) characteristics that can be connected only to the home subscriber. The method of claim 3, The terminal is a location tracking method of the terminal of the general subscriber that can not be connected to the femtocell base station. The method of claim 2, The terminal is located in the coverage of the indoor base station, the information on the cell that provides the current service according to the request of the outdoor base station, and information on the cell having the best downlink pilot signal among other cells except the cell Location tracking method for reporting to the outdoor base station. The method of claim 5, And activating the terminal through terminal paging when the terminal is in a deactivated state, and deactivating the terminal after receiving the indoor base station information from the terminal. The method according to any one of claims 2 to 6, The downlink pilot signal is a cell-specific reference signal location tracking method. As a mobile communication system, An outdoor base station for requesting information on an adjacent indoor base station from the terminal when receiving a location tracking request of the terminal and receiving indoor base station information from the terminal; And And a MME for transmitting the location tracking request to the outdoor base station and tracking the location of the terminal based on the indoor base station information transmitted from the outdoor base station. The method of claim 8, And the indoor base station information is a cell identifier of an indoor base station with a downlink pilot signal superior to the outdoor base station. 10. The method of claim 9, The outdoor base station, which is within the coverage of the indoor base station and provides information on a cell which currently provides a service according to a request of the outdoor base station, and information on a cell having the best downlink pilot signal among other cells except the cell. A mobile communication system further comprising the terminal reporting to. The method of claim 10, And when the terminal is in an inactive state, activates the terminal through terminal paging, and deactivates the terminal after receiving the indoor base station information from the terminal. 10. The method of claim 9, The indoor base station is a femtocell base station having a Closed Subscriber Group (CSG) characteristic that only a home subscriber can access. The method of claim 12, The terminal is a terminal of a general subscriber that can not be connected to the femtocell base station. The method according to any one of claims 9 to 13, The downlink pilot signal is a cell-specific reference signal.
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US11271636B2 (en) 2017-02-08 2022-03-08 British Telecommunications Public Limited Company Cellular telecommunications network
US10772020B2 (en) 2017-03-24 2020-09-08 British Telecommunications Public Limited Company Cellular telecommunications network
US11516710B2 (en) 2017-03-24 2022-11-29 British Telecommunications Public Limited Company Cellular telecommunications network
US11197333B2 (en) 2018-03-28 2021-12-07 British Telecommunications Public Limited Company Predictive bearers in a wireless communication network
US11337262B2 (en) 2018-03-28 2022-05-17 British Telecommunications Public Limited Company Predictive bearers in a wireless communication network
US11405849B2 (en) 2018-03-28 2022-08-02 British Telecommunications Public Limited Company Roaming route optimization
US11477691B2 (en) 2018-03-29 2022-10-18 British Telecommunications Public Limited Company Dedicated bearer management
US11039388B2 (en) 2019-07-29 2021-06-15 British Telecommunications Public Limited Company Cellular telecommunications network
US11812320B2 (en) 2019-07-29 2023-11-07 British Telecommunications Public Limited Company Initiation of transfer of user equipment to base station according to visual data

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