Source: http://www.google.nl/patents/US20090098873
Timestamp: 2017-12-16 13:03:56
Document Index: 653438891

Matched Legal Cases: ['art 1992', 'art 2003', 'art 2003', 'art 2006', 'art 2008', 'art 2008', 'art 2003', 'art 2003', 'art 2006', 'art 2009', 'art 2010', 'art 2010', 'art 2010', 'art 2014', 'art 2013', 'art 2014', 'art 2014', 'art 2013', 'art 2015', 'art 2017', 'art 2010', 'art 2011', 'art 2013', 'art 2013', 'art 2015', 'art 2011']

Patent US20090098873 - System and method to locate femto cells with passive assistance from a macro ... - Google Patenten
A system, method and computer product for a mobile station to locate a femto cell, the method comprising: (a) storing in a database information to locate at least one femto cell; (b) receiving, from at least one macro cell, location information of the UE; (c) searching within the database to determine...http://www.google.nl/patents/US20090098873?utm_source=gb-gplus-sharePatent US20090098873 - System and method to locate femto cells with passive assistance from a macro cellular wireless network
Publicatienummer US20090098873 A1
Publicatiedatum 16 april 2009
Ook gepubliceerd als CA2702224A1, CA2702262A1, CA2809102A1, CN101855929A, CN101855929B, CN101855931A, CN103220619A, CN103228028A, CN103428633A, CN103476095A, CN103476095B, CN105656593A, EP2210443A2, EP2210443B1, EP2220895A2, EP2273825A2, EP2273825A3, EP2273833A2, EP2273833A3, US9137745, US20090098885, WO2009049155A2, WO2009049155A3, WO2009049197A2, WO2009049197A3
Publicatienummer 12248247, 248247, US 2009/0098873 A1, US 2009/098873 A1, US 20090098873 A1, US 20090098873A1, US 2009098873 A1, US 2009098873A1, US-A1-20090098873, US-A1-2009098873, US2009/0098873A1, US2009/098873A1, US20090098873 A1, US20090098873A1, US2009098873 A1, US2009098873A1
Patentcitaties (84), Verwijzingen naar dit patent (128), Classificaties (12), Juridische gebeurtenissen (1)
US 20090098873 A1
1. A method for a user's equipment (UE) to locate a femto cell, the method comprising:
storing in a database information to locate at least one femto cell;
receiving, from at least one macro cell, location information of the UE;
searching within the database to determine if the UE is in a general proximity of at least one femto cell; and
if so, accessing the femto cell using the database information corresponding to the femto cell.
searching the database for match, wherein a system ID database entry matches the system ID of the macro system around the femto cell, a network ID database entry matches the network ID of the macro system around the femto cell, a base ID database entry matches the base ID of the macro cell, base latitude matches the latitude of the macro cell and base longitude matches the longitude of the macro cell;
if there is match, tuning the UE to a femto cell frequency, FF;
taking a sample segment of CDMA signal;
conducting pilot search for a pilot PN Offset; and
if there is no match, tuning the UE to a macro cell frequency, FM.
searching the database for the pilot PN Offset with sufficient Ec/I0;
if the pilot PN Offset of sufficient Ec/I0 is found, performing by the UE idle Handoff (HO) for the femto cell;
if no pilot PN Offset of sufficient Ec/I0 is found, tuning the UE to the macro cell frequency FM.
demodulating by the UE femto cell paging channel;
getting System Parameters Message (SPM) of the femto cell; and
5. The method of claim 4, wherein demodulating process further comprising:
confirming parameters by the UE system ID, network ID and base ID;
if confirmation fails, attempting to register on the femto cell to determine if it is allowed to access it.
6. A user's equipment (UE) comprising:
wherein a database information includes for each femto cell—carrier frequency, location, list of CDMA Pilots offsets with Ec/I0 above a given threshold, system ID for the femto cell, network ID for the femto cell and base ID broadcast for the femto cell;
wherein the UE searches the database to determine if it is in a general proximity of at least one femto cell;
if so, the UE accesses the femto cell using the database information corresponding to the femto cell.
7. The user's equipment (UE) of claim 6, wherein the femto search is only conducted if there is a match in the database.
8. The user's equipment (UE) of claim 7, wherein the database match is when a system ID matches the system ID of the macro system around the femto cell, a network ID matches the network ID of the macro system around the femto cell, a base ID matches the base ID of the macro cell, base latitude matches the latitude of the macro cell and base longitude matches the longitude of the macro cell
9. The user's equipment (UE) of claim 8, wherein if there is a database match, the UE tunes to a femto cell frequency FF.
10. The user's equipment (UE) of claim 8, wherein if there is no a database match, the UE tunes to a macro cell frequency FM.
11. A computer-program product, comprising:
store in a database information to locate at least one femto cell;
receive, from at least one macro cell, location information of the UE;
search within the database to determine if the UE is in a general proximity of at least one femto cell; and
if so, access the femto cell using the database information corresponding to the femto cell.
12. The computer-program product of claim 11, further comprising codes for causing a computer to:
search the database for match, wherein a system ID database entry matches the system ID of the macro system around the femto cell, a network ID database entry matches the network ID of the macro system around the femto cell, a base ID database entry matches the base ID of the macro cell, base latitude matches the latitude of the macro cell and base longitude matches the longitude of the macro cell;
if there is match, tune the UE to a femto cell frequency, FF;
take a sample segment of CDMA signal;
conduct pilot search for a pilot PN Offset; and
13. The computer-program product of claim 11, further comprising codes for causing a computer to:
search the database for the pilot PN Offset with sufficient Ec/I0;
if the pilot PN Offset of sufficient Ec/I0 is found, perform by the UE idle Handoff (HO) for the femto cell;
if no pilot PN Offset of sufficient Ec/I0 is found, tune the UE to the macro cell frequency FM.
14. The computer-program product of claim 11, further comprising codes for causing a computer to:
demodulate by the UE femto cell paging channel;
get System Parameters Message (SPM) of the femto cell; and
15. The computer-program product of claim 14, further comprising codes for causing a computer to:
match with system ID for the femto cell, with the network ID for the femto cell, and base ID broadcast in the femto cell SPM ; and
if confirmation fails, attempt to register on the femto cell to determine if it is allowed to access it.
means for storing in a database information to locate at least one femto cell;
means for receiving, from at least one macro cell, location information of the UE;
means for searching within the database to determine if the UE is in a general proximity of at least one femto cell; and
if so, means for accessing the femto cell using the database information corresponding to the femto cell.
means for searching the database for match, wherein a system ID database entry matches the system ID of the macro system around the femto cell, a network ID database entry matches the network ID of the macro system around the femto cell, a base ID database entry matches the base ID of the macro cell, base latitude matches the latitude of the macro cell and base longitude matches the longitude of the macro cell;
means for searching the database for the pilot PN Offset with sufficient EC/I0;
if the pilot PN Offset of sufficient EC/I0 is found, means for performing by the UE idle Handoff (HO) for the femto cell;
if no pilot PN Offset of sufficient EC/I0 is found, means for tuning the UE to the macro cell frequency FM.
means for demodulating by the UE femto cell paging channel;
means for getting System Parameters Message (SPM) of the femto cell; and
if confirmation fails, means for attempting to register on the femto cell to determine if it is allowed to access it.
21. A method for a user's equipment (UE) to locate a femto cell, the method comprising:
determining by the UE if it is in a low mobility status, wherein a degree of mobility can be evaluated by estimating total pilot phase excursions over a period of time;
taking a signal sample;
conducting a search for all Pilot PN offsets reserved to femto cell use;
determining by the UE if the femto cell is authorized to use;
if so, registering the UE on the femto cell; and
if not, returning to monitor a macro system.
22. The method of claim 21, wherein the UE uses pilot phase deviations of a plurality of macro cells to evaluate its state of mobility.
23. The method of claim 21, wherein the UE searches for pilots in its neighbor list from the macro cells, gets the raw information about the pilot phases, based on which it determines its mobility state.
24. The method of claim 21, wherein the UE takes samples without loosing pages on the macro system that the UE monitors.
25. The method of claim 24, wherein the samples taken for targeted search can be reused to find new femto cells.
26. An apparatus to locate a femto cell, comprising:
means for determining by the UE if it is in a low mobility status, wherein a degree of mobility can be evaluated by estimating total pilot phase excursions over a period of time;
means for tuning to a frequency where femto cells are deployed;
means for taking a signal sample;
means for conducting a search for all Pilot PN offsets reserved to femto cell use; finding the femto cell;
means for determining by the UE if the femto cell is authorized to use;
27. The apparatus of claim 26, wherein the UE uses pilot phase deviations of a plurality of macro cells to evaluate its state of mobility.
28. The apparatus of claim 26, wherein the UE searches for pilots in its neighbor list from the macro cells, gets the raw information about the pilot phases, based on which it determines its mobility state.
29. The apparatus of claim 26, wherein the UE takes samples without loosing pages on the macro system that the UE monitors.
30. The apparatus of claim 26, wherein the samples taken for targeted search can be reused to find new femto cells.
31. A computer-program product, comprising:
determine by the UE if it is in a low mobility status, wherein a degree of mobility can be evaluated by estimating total pilot phase excursions over a period of time;
take a signal sample;
conduct a search for all Pilot PN offsets reserved to femto cell use;
find the femto cell;
determine by the UE if the femto cell is authorized to use;
32. The computer-program product of claim 31, wherein the UE uses pilot phase deviations of a plurality of macro cells to evaluate its state of mobility.
33. The computer-program product of claim 31, further comprising codes for causing a computer to:
search for pilots in its neighbor list from the macro cells, get the raw information about the pilot phases, based on which it determines its mobility state.
34. The computer-program product of claim 31, further comprising codes for causing a computer to take samples without loosing pages on the macro system that the UE monitors.
35. The computer-program product of claim 31, further comprising codes for causing a computer to take sample for targeted search for reuse to find new femto cells.
processor that determines its low mobility status, wherein a degree of mobility can be evaluated by estimating total pilot phase excursions over a period of time;
receiver that tunes to a frequency where femto cells are deployed;
said processor takes a signal sample, conducts a search for all Pilot PN offsets reserved to femto cell use, finds the femto cell, determines if the femto cell is authorized to use,
if so, registers itself on the femto cell; and
if not, returns to monitor a macro system.
37. The user equipment (UE) of claim 36, wherein the UE uses pilot phase deviations of a plurality of macro cells to evaluate its state of mobility.
38. The user equipment (UE) of claim 36, wherein the UE searches for pilots in its neighbor list from the macro cells, gets the raw information about the pilot phases, based on which it determines its mobility state.
39. The user equipment (UE) of claim 36, wherein the UE takes samples without loosing pages on the macro system that the UE monitors.
40. The user equipment (UE) of claim 36, wherein the samples taken for targeted search can be reused to find new femto cells.
FIG. 2 illustrates an exemplary communication system to enable deployment of femto nodes, also known as femto cells (access point base stations) within a network environment. As shown in FIG. 2, the system 200 includes multiple femto nodes, or, in the alternative, femto cells, access point base stations, Home Node B (HNB) units such as, for example, HNB 210, each being installed in a corresponding relatively small coverage network environment, such as, for example, in one or more sites 230, and such as, for example, being configured to serve associated user equipment 220, as well as alien user equipment 225. Each HNB 210 may be coupled to and further configured to communicate via a wide area network, such as the Internet 240, and to any node on the Internet, including a macro mobile operator core network 250 (also referred to as a “core network”). In exemplary configurations, a site might include DSL routers and/or cable modems 260 1, 260 2, through 260 N. As shown, there are at least two communication paths between a terminal device 220 and the macro mobile operator core network 250, namely a path including macro cell access 270, and a path including the Internet 240.
Although embodiments described herein use 3GPP terminology, it is to be understood that the embodiments may be applied not only to 3GPP (Rel99, Rel5, Rel6, Rel7, etc.) technology, but also to 3GPP2 (1×RTT, 1×EV-DO Rel0, RevA, RevB, etc.) technology, as well as to other known and related technologies. In such embodiments described herein, the proprietor of the HNB 210 might subscribe to mobile services such as, for example, 3G mobile services, offered through the macro mobile operator core network 250, and the UE 220 might be capable of operating both in a macro cellular environment and in an HNB-based small coverage network environment. Thus, the HNB 210 might be adapted for backward compatibility with any existing UE 220.
In one embodiment, each entry of the database circumscribes a femto cell location in a non-orthogonal coordinate system comprised of macro pilots visible at that femto location (with qualifying minimum EC/Io ), the phase delay of each pilot, and allowed deviation around that nominal phase delay. When the database is already available in the UE 220, it can be used to gate femto searching. The UE 220 on a frequency other than FF conducts search on FF only when there is a database match. In one embodiment, the database elements include macro pilot PN offsets, which are all visible by the UE 220 on whatever carrier it is monitoring in the idle state. These PN offsets are accessible to the UE in the course of routine operation in idle state, and the UE does not have to do anything different until there is a database match. Then the UE 220 starts scanning for the HNB or femto cell 210, which is on a different frequency. Operating this way will reduce battery drainage.
FIG. 4 illustrates a femto cell search using the FCD. Location of the femto cell in FCD is expressed in a non-orthogonal coordinate system, and need not be of high degree of accuracy—it's only used to gate searching for femto cell. Finding location of the femto cell can be improved with bad geometries (the case when the UE is in a location dominated by a single BS, so others are difficult to detect) with Highly Detectable Pilots defined for HRPD radio technology. Block 402 shows trajectory of UE 220 approaching a femto cell 412 which is in that UEs FDC. Block 416 illustrates trajectory of UE 221 without that FCD entry. The femto cell search begins at block 404 (UE 220 enters the FDC described perimeter) and ends at block 406 (UE exits that perimeter). Block 408 illustrates that femto cell is found, i.e. UE 220 is close enough to the femto cell 412, so that when it searches for it, it detects the femto cell pilot of sufficient EC/Io. Block 410 illustrates that “Stationary” UE 222 upon conducting exploratory search discovers a new femto cell and puts it in FCD upon authorization check. Block 412 illustrates the femto cell. Block 414 illustrates how FCD describes femto perimeter. The solid lines represent “trajectory” of non-femto UE and “trajectory” of a femto UE. The doted line represents an alternative trajectory of a UE that enters the perimeter described in the FCD, but does not approach the associated femto cell close enough to be able to detect it. If the UE 220 detects a femto cell not on its FCD, it may choose to evaluate it and eventually place into FCD. Generally, a femto is fit to be in FCD if the UE 220 can register on that femto. When on a femto, UE routinely monitors femto pilot, evaluates signal strength, in case Hand Off (HO) is needed. This monitoring can be used to update FCD, e.g. to adjust femto perimeter as it was shown in Block 414.
Pilot Period T=2 15=32,768 chips (26.667 ms);
The teachings herein may be incorporated into various types of communication systems and/or system components. In some aspects, the teachings herein may be employed in a multiple-access system capable of supporting communication with multiple users by sharing the available system resources (e.g., by specifying one or more of bandwidth, transmit power, coding, interleaving, and so on). For example, the teachings herein may be applied to any one or combinations of the following technologies: Code Division Multiple Access (“CDMA”) systems, Multiple-Carrier CDMA (“MCCDMA”), Wideband CDMA (“W-CDMA”), High-Speed Packet Access (“HSPA,” “HSPA+”) systems, Time Division Multiple Access (“TDMA”) systems, Frequency Division Multiple Access (“FDMA”) systems, Single-Carrier FDMA (“SC-FDMA”) systems, Orthogonal Frequency Division Multiple Access (“OFDNM”) systems, or other multiple access techniques. A wireless communication system employing the teachings herein may be designed to implement one or more standards, such as IS-95, cdma2000, IS-856, W-CDMA, TDSCDMA, and other standards. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (“UTRA)”, cdma2000, or some other technology. UTRA includes W-CDMA and Low Chip Rate (“LCR”). The cdma2000 technology covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (“GSM”). An OFDMA network may implement a radio technology such as Evolved UTRA (“E-UTRA”), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM®, etc. UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (“UMTS”). The teachings herein may be implemented in a 3GPP Long Term Evolution (“LTE”) system, an Ultra-Mobile Broadband (“UMB”) system, and other types of systems. LTE is a release of UMTS that uses E-UTRA. Although certain aspects of the disclosure may be described using 3GPP terminology, it is to be understood that the teachings herein may be applied to 3GPP (Rel99, Rel5, Rel6, Rel7) technology, as well as 3GPP2 (1×RTT, 1×EV-DO Rel0, RevA, RevB) technology and other technologies.
FIG. 8 depicts an example block diagram of a system 800 in accordance with additional aspects described herein. System 800 provides an apparatus that can facilitate locating a femto cell. Specifically, system 800 can include a plurality of modules or means, each connected to a communication link 805, and can communicate with other modules or means over communication link 805.
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Classificatie in de VS 455/436, 455/458
Internationale classificatie H04W36/00, H04W68/00
Coöperatieve classificatie H04W48/20, Y02B60/50, H04J11/0069, H04W64/00, H04W4/02, H04W84/045
Europese classificatie H04J11/00J, H04W48/20