WO2008051124A1 - Method and apparatus for estimating a position of an access point in a wireless communications network - Google Patents
Method and apparatus for estimating a position of an access point in a wireless communications network Download PDFInfo
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- WO2008051124A1 WO2008051124A1 PCT/SE2006/050428 SE2006050428W WO2008051124A1 WO 2008051124 A1 WO2008051124 A1 WO 2008051124A1 SE 2006050428 W SE2006050428 W SE 2006050428W WO 2008051124 A1 WO2008051124 A1 WO 2008051124A1
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- access point
- control node
- neighbour
- network control
- femto
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 claims description 3
- 201000001718 Roberts syndrome Diseases 0.000 claims 8
- 208000012474 Roberts-SC phocomelia syndrome Diseases 0.000 claims 8
- 238000005001 rutherford backscattering spectroscopy Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000010267 cellular communication Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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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
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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- 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
Definitions
- the present invention relates to a wireless communications network, and more particularly, to a method and apparatus for estimating a position of an Access Point in a wireless communications network.
- the present invention relates to wireless communications networks.
- a geographical area to be covered by the network is divided into cells each being controlled by a node.
- the nodes are represented by Radio Base stations (RBSs), or Node-B as called in 3GPP specifications. Communications to and from a mobile terminal in a cell take place via a node over one or more frequency channels allocated to the cell .
- RBS Radio Base station
- WCDMA wideband code division multiple access network
- RAN Radio Access Network
- Cells may be of different types. For example macro cells are used in a network to provide large area coverage. Micro cells are deployed in many networks to increase capacity. Within one macro cell coverage area there maybe one or more micro cells.
- Hierarchical cellular communications systems employ different size cells to provide both wide-coverage, basic- service (macro cell) and high-quality, high-capacity radio coverage in smaller areas (micro cells).
- Micro cells are useful in specific areas. For example, micro cells may be located to serve areas of concentrated traffic within the macro cell or to provide a high data rate service.
- a micro cell uses a low- height antenna and a low base station transmit power which result in a small cell and a short frequency reuse distance, thereby increasing capacity. Additional benefits of a smaller cell include a longer talk- time (battery life time) for users since mobile stations will likely use a substantially lower uplink transmit power to communicate with a micro cell Radio Base station (RBS) than with a base station in a larger macro cell which is likely further away.
- RBS Radio Base station
- a micro cell base station may be connected to a macro cell base station via digital transmission lines, or the micro cell base station may be treated just like a macro cell and be connected directly to a base station controller node.
- Such control nodes are a base station controller (BSC) , in the well-known global system for mobile communications (GSM) systems, or a radio network controller (RNC) , in the third generation, wideband code division multiple access (WCDMA) systems.
- GSM global system for mobile communications
- RNC radio network controller
- WCDMA wideband code division multiple access
- Mobile communications networks are growing rapidly as new cells are introduced into the networks.
- a geographical position of a base station is manually configured in a control node.
- current way to manually configure the position doesn't work for a home RBS scenario, as end users install their own home RBSs.
- the end users are also capable of moving home RBSs when moving to or visiting a new location (house, city etc.), without an operator being able, or in many cases willing, to control this. This means that wherever a home RBS is installed and connects to an RNC in a new location, geographical data would need to be updated.
- Patent document US20030148774 relates to a telecommunications system and a method for use in a telecommunications system.
- the telecommunications system comprises a plurality of service areas, each of the service areas being identified by a service area identifier.
- a service area identifier is requested that associates with a mobile station.
- one service area identifier is selected from a plurality of possible service area identifiers.
- a predefined rule for the selection of the service area identifier is used for the selection.
- Location information that associates with the mobile station is then provided based on the selected service area identifier.
- GPS global positioning system
- a method for estimating a position of an Access Point in a wireless communications network is disclosed.
- the Access Point used for connecting wireless networks to a core network, is being equipped with a User Equipment module, UE module.
- the UE module is used for scanning, for example upon a triggering event, a surrounding environment of the Access Point to identify neighbour Radio Base Stations.
- the Access Point then creates a neighbour list including information relating to neighbour Radio Base Stations .
- the Radio Base Stations being Macro RBSs and/or Femto RBSs .
- a connection is establishing between the Access Point and a Network Control Node.
- the Access Point forwards the neighbour list to the Network Control Node, wherein the Network Control Node uses the information in the neighbour list to estimate a position of the Access Point.
- an Access Point is described.
- the Access Point is used for connecting wireless networks to a core network, and wherein the Access
- the Point is equipped with a user Equipment module, UE module.
- the UE module is used for scanning a surrounding environment of the Access Point to identify neighbour Radio Base Stations .
- the UE module then receives information from neighbour Radio Base Stations, the information is to be stored and used for estimating a position of the Access Point.
- a neighbour list manager in the Access Point is used for creating neighbour lists including information relating to neighbour Radio Base Stations .
- the Access Point further comprises connection establishing equipment used for establishing a connection between the Access Point and a Network Control Node, and for forwarding the neighbour list from the Access Point to the Network Control Node.
- the Network Control Node uses the information in the neighbour list to estimate a position of the Access Point.
- a network control node comprises connection establishing equipment used for establishing a connection between the Network Control Node and an Access Point, and for receiving a neighbour list from the Access Point.
- the neighbour list includes information relating to neighbour Radio Base Stations in a surrounding environment of the Access Point.
- the network control node further comprises a database including information relating to Radio Base stations in an area covered by the Network Control Node. Estimation equipment is used to estimate and automatically update a position of the Access Point based on information retrieved from the neighbour list and information stored in the database.
- Figure 1 is a block diagram illustrating an embodiment of the present invention.
- Figure 2 is a signal diagram illustrating an embodiment of the present invention for performing position estimation.
- Figure 3 is a signal diagram illustrating another embodiment of the present invention for performing position estimation.
- Figure 4 is a flowchart illustrating a method according to an embodiment of the present invention.
- Figure 5 is a block diagram illustrating an Access Point and a network control node according to an embodiment of the present invention.
- H3GAPs Home 3G Access Points
- Femto RBSs Femto RBSs
- a H3GAP is mainly targeted for private homes and small office segments and one benefit is that there is no need for alternative access technology investments or WLAN/UMA/GAN in handsets, since any existing 3G phones will work in such an environment.
- Examples of 3G standards are Wideband Code Division Code Multiple Access (WCDMA) , CDMA2000 and Time Division - Synchronous Code Division Multiple Access (TD-SCDMA) .
- the invention described in this document is mostly relevant for a scenario using WCDMA, but it could also be applied in other cases.
- a similar solution might be developed for GSM, CDMA2000 or TD-SCDMA.
- the WCDMA scenario is mostly used to achieve a more easy disclosure and better understanding of the present invention.
- the H3GAPs provides normal WCDMA coverage for end users and is connected to a Radio Network Controller (RNC) using some kind of IP based transmission.
- a coverage area provided is called a Femto cell to indicate that the coverage area is relatively small compared with an area of a Macro cell.
- RNC Radio Network Controller
- One alternative for the IP based transmission is to use Fixed Broadband access (like xDSL, Cable etc.) to connect the H3GAPs to the RNC.
- Mobile Broadband access e.g. Wimax, HSDPA and Enhanced Uplink.
- a H3GAP is installed and managed by end users in a plug-and-play manner which creates special needs for such a system.
- FIG. 1 is a block diagram according to an embodiment of the invention illustrating a WCDMA network including Home 3G Access Points .
- the wireless communications network 1 includes a core network (CN) 2 connected to a radio network controller, RNC 3, using a standard Iu interface.
- the RNC is a Macro RNC and/or a Femto RNC.
- the RNC controls all Radio Base stations that are connected to the RNC, both Macro and Femto Radio Base stations.
- the RNC 3 is connected to one or more Macro RBSs 4 and to one or more Femto RBSs 6 belonging to a group of Femto RBSs 5.
- the interface between the Femto RBS and the RNC is an Iub+ interface or an Extended Iub interface.
- the Iub+ interface resembles the Iub interface, but is modified for conveying additional information. Alternatively a new protocol is used to convey such additional information.
- the interface is transported using an IP network providing IP connectivity between a Femto RBS and the RNC. As this IP network may consists of unprotected IP networks, security mechanisms between the RNC and the Femto RBSs are included. Communication between the RNC 3 and the Macro RBSs 4 are IP based or IP/ATM based, and the interface is Iub.
- the Macro RBSs 4 are working as an Access Point for one or more mobiles 9 within macro cells 7.
- the group of Femto RBSs 5 are working as Access Points for mobiles within Femto cells 8. For simplicity only one macro cell 7 is described in figure 1. Also, the Macro RBSs 4 are connected to one or more RNCs 3.
- the CN 2 might also be connected to two RNCs, a Macro 11 and a Femto RNC 10, dashed lines in the figure.
- the Macro RNC 11 controls Macro Radio Base stations 4, Macro RBSs 4, and the Femto RNC 10 controls Femto RBSs 6, H3GAPs, marked with dashed lines.
- the Macro RNC 11 and the Femto RNC 10 would exchange information concerning Access Points 6, if necessary.
- An Operating Support System (OSS) 12 usually performs management of Access Points and Macro RBSs .
- a Femto RBS manager 13, also called H3GAP manager, is responsible for managing Femto RBSs .
- the OSS and the Femto RBS manager are stand alone nodes or parts of other nodes like the RNC 3 or the CN 2.
- the OSS and the Femto RBS manager might also be distributed programs in a network 1.
- the Access Point for a mobile user is a Femto RBS 6 when the mobile user is within the reach of the Femto RBS 6.
- the Access Point becomes a new Femto RBS 6 or a Macro RBS 4.
- An embodiment of the present invention is to make it possible to automatically estimate a position of an Access Point and maintain accurate position data.
- the position information is for example used in case of an emergency call.
- Figure 2 is a signal diagram illustrating an embodiment of the present invention for estimating a position of an Access Point (AP) in a wireless communications network including a large number of APs.
- the signal diagram illustrates the following steps:
- a Femto RBS is initially powered up. This is the case when a Femto RBS for the first time is taken into use or the time after the Femto RBS has been moved to another location. Of course a Femto RBS can be powered off and on in the same location as previously.
- the Femto RBS performs defined power up activities for this node type, which are predefined and set by a node provider.
- the Femto RBS either dynamically builds an address identifier for a controlling Network Central Node, or the Femto RBS is already preconfigured with address information concerning a Central Node .
- a WCDMA user module, WCDMA UE, in the Femto RBS scans the surrounding WCDMA environment macro coverage to find out which macro WCDMA base stations or more correctly which WCDMA macro cells that exists in a current location. Information about these macro cells base stations and relevant information is retrieved. The information relates to one or more of the following: frequency, Scrambling Code, Public land mobile network identifier (PLMN-ID) , Location Area Code (LAC) , Routing Area Code (RAC) , Cell identity (CI) and if available Reference position (latitude/longitude) .
- PLMN-ID Public land mobile network identifier
- LAC Location Area Code
- RAC Routing Area Code
- CI Cell identity
- the Femto RBS performs a signal strength measurement for all found cells in a similar way as a UE measures neighbouring cells in a macro WCDMA case. Also, information about transmit power used is retrieved.
- Femto Cells may be found during this step if the Femto RBS is not able to distinguish these cells from the macro cells.
- Femto RBS_DNL Femto RBS Detected Neighbour list
- the Femto RBS_DNL When the Femto RBS_DNL is built in the Femto RBS, the Femto RBS establishes a connection to a Femto RNC. 5. The Femto RBS_DNL is reported to the Femto RNC. If the Femto RBS_DNL contains information relating to identified Femto cells, then the Femto RNC is capable of removing these cells from the list.
- the Femto RNC uses the received information (i.e. the Femto RBS_DNL) to determine an approximate position for the Femto RBS. Additionally, the Femto RNC uses configured geographical information for heard macro cells when determining the position of a Femto RBS.
- the PLMN-ID, RAC, LAC and CI reported for a macro cell is to be used to find out which Macro RBS is controlling a macro cell and to find out a possibly configured geographical position for that Macro RBS.
- the position of the Femto RBS is stored/updated in a database (RNC internal or external) .
- the database is centralized and called Home 3G Access Database (H3GA DB) .
- the Femto RBSs 6 and Macro RBSs 4 are controlled by different RNCs, as in figure 1, the Femto RNC controlling the Femto RBSs does not have the geographical positions, e.g. longitude/latitude, for the Macro RBSs stored in its own data. Thus, new step 6 to step 10 are introduced as in figure 3.
- the Femto RBS will not be able to estimate a position for the Femto RBS based on the position of the Macro RBS, without the position information of the Macro RBSs.
- the Femto RNC checks its internal database for a matching Macro RNC serving macro cells retrieved from the Femto
- the Femto RNC requests, from the identified Macro RNC, the positions of the macro cells.
- the Femto RNC then receives the positions of the macro cells, from the Macro RNC.
- the Femto RNC uses the received position information, from the Macro RNC, and additional information from the Femto RBS_DNL to determine an approximate position for the Femto RBS.
- the estimated position of the Femto RBS is stored in a database (RNC internal or external) .
- the database is centralized and called Home 3G Access Database (H3GA DB) .
- geographical positions of Macro RBSs are stored in a central database which is accessed by a Femto RNC (e.g. in the H3GA DB) . Also in this case, the PLMN-ID, LAC and CI reported for a macro cell is to be used to point out the Macro RBS.
- a Femto RNC e.g. in the H3GA DB
- transmit power and signal strength is retrieved and used to calculate an approximate distance to all heard Macro RBSs. This calculation is preferably done by the Femto RBS or the RNC and stored in the Femto RBS_DNL. The more Macro RBSs a Femto RBS can hear and detect the more accurate position estimation is performed.
- FIG. 4 is a flowchart illustrating a method according to an embodiment of the present invention. The method is used for estimating a position of an AP in a wireless communications network.
- the AP according to the flowchart illustrates the following steps (S) :
- the AP is equipped with an UE module. Activation of the AP is performed for example after that the AP is moved to a new location or when switched on for the first time. Of course the end-user is able to switch on and off the AP at any time, for example when saving power consumption etc.
- the neighbour cells are cells served by Macro RBSs
- RNC are IP based.
- FIG. 5 is a block diagram illustrating an Access Point and a network node in accordance to an embodiment of the present invention.
- the wireless communication network 1 includes Access Points and Network Control Nodes communicating with each other directly or via other Network Control Nodes .
- Figure 5 shows only a simplified view of the network comprising only one Access Point and one Network Control Node, i.e. RNC.
- RNC Network Control Node
- the Access Point and the Network Control Node, in figure 5 are both simplified and contain only parts that are relevant for describing the invention.
- An Access Point 20 according to figure 5, comprises a User Equipment Module (UE module) 21 used for scanning a surrounding of the Access Point.
- UE module User Equipment Module
- the UE module 21 scans and identifies cells and Access Points (4, 6) in a neighbour area serving the cells.
- the cells (7, 8) are areas served by Radio Base stations, Macro RBSs 4 or Femto RBSs 6. The scanning is performed automatically, periodically or event triggered by an end user.
- the Access Point 20 further comprises a neighbour list manager 22 used for creating and managing neighbour lists.
- the neighbour lists are Femto RBS Detected Neighbour Lists (Femto RBS_DNLs) including information relating to neighbour Radio Base Stations .
- Connection establishing equipment 23 is used for setting up a connection between the Access Point 20, i.e.
- the Network Control Node 30 includes also a connection establishing equipment 31 for connecting to the Access Point 20 and for receiving Femto RBS_DNLs .
- the Network Control Node 20 further includes a database 32, including Lookup tables, with macro and Femto RBS information.
- the database 32 includes also a lookup table with Macro RNC identities.
- Estimation equipment (33) in the Network Control Node 30 is used for estimating a position of an Access Point 20 based on information retrieved from the Femto RBS_DNL and the database 32.
- the Network Control Node 30 checks its Lookup table to identify serving Macro RNCs which can provide such position information.
- the Network Control Node 30, in figure 5, manages one or several Access Points 5, as in figure 1.
- Figure 5 shows only parts of the wireless communications network 1 needed to explain the present invention in a simple manner.
- a reference position broadcasted in system information could be used as an input for estimation of a position of an Access Point
- the broadcasted reference information is for example latitude/longitude used together with other relevant data e.g. Signal strength measurements.
- the AP is thereby able to estimate its own position based on position information received from neighbour base stations and thereafter update the RNC with this information.
- the position estimation procedure mentioned above is performed automatically upon a triggering event.
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800562267A CN101529941B (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
JP2009534531A JP5021753B2 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating the location of an access point in a wireless communication network |
PCT/SE2006/050428 WO2008051124A1 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
US12/447,344 US8320331B2 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
EP06813048A EP2077050A4 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
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PCT/SE2006/050428 WO2008051124A1 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
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WO2008051124A1 true WO2008051124A1 (en) | 2008-05-02 |
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PCT/SE2006/050428 WO2008051124A1 (en) | 2006-10-27 | 2006-10-27 | Method and apparatus for estimating a position of an access point in a wireless communications network |
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US (1) | US8320331B2 (en) |
EP (1) | EP2077050A4 (en) |
JP (1) | JP5021753B2 (en) |
CN (1) | CN101529941B (en) |
WO (1) | WO2008051124A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
JP2010507963A (en) | 2010-03-11 |
US20100067482A1 (en) | 2010-03-18 |
JP5021753B2 (en) | 2012-09-12 |
EP2077050A1 (en) | 2009-07-08 |
CN101529941A (en) | 2009-09-09 |
EP2077050A4 (en) | 2012-10-24 |
CN101529941B (en) | 2012-05-30 |
US8320331B2 (en) | 2012-11-27 |
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