WO2011075464A1 - Method and system for wfap auto-configuration via neighbor base station auto-discovery - Google Patents

Method and system for wfap auto-configuration via neighbor base station auto-discovery Download PDF

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Publication number
WO2011075464A1
WO2011075464A1 PCT/US2010/060217 US2010060217W WO2011075464A1 WO 2011075464 A1 WO2011075464 A1 WO 2011075464A1 US 2010060217 W US2010060217 W US 2010060217W WO 2011075464 A1 WO2011075464 A1 WO 2011075464A1
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WO
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Prior art keywords
wfap
base station
neighbor base
information
based
Prior art date
Application number
PCT/US2010/060217
Other languages
French (fr)
Inventor
Trici So
Li Chu
Jianquan Song
Wen Luo
Yangwei Tu
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Zte Usa Inc.
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/02Arrangements for optimising operational condition
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/003Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Certain embodiments of the present invention provide for methods of configuring a WFAP. In one embodiment, a WFAP receives neighbor base station identification information during its initial scanning. Subsequently, the WFAP reports this neighbor base station identification information as well as its own location information to a SON server. The WFAP then receives radio frequency (RF) parameters from the SON server. After receiving neighboring base station RF parameters, the WFAP scans neighboring base stations based on the received RF parameters.

Description

S P E C I F I C A T I O N

METHOD AND SYSTEM FOR WFAP AUTO-CONFIGURATION VIA

NEIGHBOR BASE STATION AUTO-DISCOVERY

PRIORITY

[0001] Priority is claimed to U.S. Provisional Patent Application No. 61/286,220, filed December 14, 2009, the disclosure of which is incorporated herein by reference in its entirety.

FIELD OF THE INVENTION [0002] The field of the present invention is wireless communication, particularly auto-configuration of a wireless femto access point.

BACKGROUND

[0003] Cellular communication systems are typically arranged so that a plurality of base stations are strategically positioned to provide wireless communication service over corresponding geographic areas. The area served by a base station is typically referred to as a cell. For various reasons it is desirable for the base station to have information regarding nearby, or neighboring base stations, one of these reasons being for facilitating handoffs as mobile stations travel between cells. A listing of such base stations is typically referred to as a neighbor relation table (NRT). [0004] Generally, in cellular systems, system operators manually configure and manage neighbor lists based on the relative locations of base stations. This manual operation may be efficient for a network topology that hardly changes. However, in a femtocell network, WiMAX femtocell access points (WFAPs) can be frequently installed or uninstalled by a user, and not just by a system operator, making it difficult for system operators to effectively manage neighbor lists. Therefore, automatic configuration schemes are desirable to lessen the system operator's burden of managing neighbor cells.

[0005] In existing auto-configuration design, the WFAP's neighbor list auto-configuration during WFAP initialization is done prior to location authorization by a self-organized network ("SON") server. It is to note that, when the WFAP performs free scanning before the location authorization, the WFAP has no way to determine if the target neighbor, regardless if it is a macro-base station or a WFAP, is a legitimate neighbor base station that the WFAP should consider. This is because the network access provider ("NAP") of the neighbor base station may not have any business relationship with the femto network service provider ("Femto-NSP") of which the WFAP is affiliated.

[0006] Therefore, a more accurate determination of the legitimate neighbor base station for the given WFAP should happen after the location authorization is complete with a SON server so that the SON server can provide scanning references by providing the radio frequency ("RF") and Media Access Control ("MAC")/Physical ("PHY") parameters to the WFAP based on the current location of the WFAP in order to assist the WFAP to proceed for the neighbor scanning operation.

SUMMARY OF THE INVENTION

[0007] The present invention is directed toward methods of WFAP auto-configuration.

[0008] In a first aspect of the present invention, a WFAP receives neighbor base station identification information during its initial scanning. The WFAP then sends this neighbor base station identification information as well as its own location information to a SON server. After authenticating the WFAP's location, the SON server obtains MAC/PHY parameters associated with at least one neighbor base station. The WFAP then receives RF parameters from the SON server. Based on the neighboring base station RF parameters, the WFAP scans neighboring base stations, and reports the scanning results to the SON server.

[0009] In a second aspect of the present invention, a SON server receives a WFAP's location information. The SON server also receives identification information of each of the WFAP's neighbor base stations. The SON server then authenticates the WFAP location information. After authenticating the WFAP's location information, the SON server requests MAC/PHY configuration information associated with each of the neighbor base stations. The SON server then sends RF parameters to the WFAP. Based on scanning results received from the WFAP, the SON server determines the WFAP's configuration information. Finally, the SON server sends the configuration information to the WFAP.

[0010] Any of the above aspects may be implemented alone or in combination.

[0011] Additional aspects and advantages of the improvements will appear from the description of the preferred embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Embodiments of the present invention are illustrated by way of the accompanying drawings, in which:

[0013] Fig. 1 is a state diagram illustrating a process of bringing a

WFAP from an initialization state to an operational state.

[0014] Fig. 2 illustrates signaling for WFAP self-configuration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Fig. 1 is a state diagram illustrating the process of bringing a WFAP from an initialization state to an operational state, and the role WFAP self-configuration plays in the process. The process 100 begins with the WFAP in an initialization state 105. If initialization fails, the WFAP proceeds to an exception processing state 120. Otherwise, upon discovery of the SON server, the WFAP enters a location authorization state 1 10. If the SON server does not authorize the WFAP's location, the WFAP enters the exception processing state 120. Alternatively, if the SON server authorizes the WFAP's location, the WFAP enters a self-configuration state 1 15. If the WFAP's self- configuration fails, the WFAP proceeds to the exception processing state 120. Otherwise, if WFAP self-configuration is successful, the WFAP enters an operational state 125.

[0016] Referring now to Fig. 2, WFAP self-configuration may be achieved using the following steps or signals. In Step 1 , an initializing WFAP receives neighboring base station identification information from a downlink Multiple Access Protocol broadcast message. In Step 2, the initializing WFAP reports a list of neighboring base station identification information to a SON server. In Step 3, the WFAP reports its own location information to the SON server. The location information may be based on neighbor WFAP and macro base station information, WFAP public internet protocol (IP) address, Global Positioning System ("GPS") information, and/or other wireless cell information. In Step 4, the SON server authenticates the location of the WFAP. In Step 5, based on successful WFAP location authentication, the SON Server queries the femto management server for MAC/PHY configuration information of neighboring WFAP(s) and macro base station(s). In Step 6, the femto management server returns the MAC/PHY configuration information of each neighboring base station based on the WFAP location. Examples of MAC/PHY configuration information include, but are not limited to:

• PHY independent uplink channel characteristics (Table 568, IEEE 802.16-2009)

• OFDMA uplink channel characteristics (Table 571 , IEEE 802.16- 2009)

• OFDMA uplink burst profiles (Table 574, IEEE 802.16-2009)

• OFDMA downlink channel characteristics (Table 575, IEEE

802.16-2009)

• OFDMA downlink burst profiles (Table 581 , IEEE 802.16-2009)

[0017] In Step 7, the SON server provides the neighboring base stations' radio frequency parameters to the WFAP to assist the initializing WFAP in scanning neighboring base stations. In Step 8, the initializing WFAP scans neighbor base stations to derive the associated MAC/PHY configuration information. In Step 9, the WFAP reports the results of the neighbor base station scanning to the SON server. These results may include a list of neighboring base station information and the MAC/PHY parameters associated with the neighboring base stations. The SON server will keep the results of the neighbor base station scanning for future self-optimization operations, including the automatic neighbor relations management for a given WFAP. In step 10, upon receiving the results of the neighbor base station scanning and the MAC/PHY configuration data obtained from the femto management server, the SON server will determine the appropriate RF parameters and MAC/PHY configuration information for the serving WFAP. In addition to the configuration information listed above, the configuration information may include, but is not limited to:

• Tx power,

• Uplink center frequency

• Downlink center frequency

• Preamble sequence

• CP

[0018] In Step 1 1 , to shorten the time required to download large amounts of MAC/PHY configuration information, the SON server may use a bulk data transfer protocol to send the MAC/PHY configuration data to the initializing WFAP.

[0019] While embodiments of this invention have been shown and described, it will be apparent to those skilled in the art that many more modifications are possible without departing from the inventive concepts herein. The invention, therefore, is not to be restricted except in the spirit of the following claims.

Claims

CLAIMS What is claimed is:
1. A method of configuring a WFAP, the method comprising:
sending location information associated with the WFAP to at least one SON server, wherein, based on the location information, the at least one SON server obtains MAC/PHY configuration information associated with at least one neighbor base station;
receiving RF parameters from the at least one SON server;
based on the received RF parameters, scanning at least one neighbor base station;
reporting, to the at least one SON server, scanning results, wherein based on the scanning results, the at least one SON server determines RF parameters and MAC/PHY configuration information associated with the WFAP; and
receiving the MAC/PHY configuration information from the at least one SON server.
2. The method of claim , wherein the location information is based on neighbor base station identification information.
3. The method of claim 1 , wherein the location information is based on a WFAP public IP address.
4. The method of claim 1 , wherein the location information is based on GPS information.
5. The method of claim 1 , prior to sending location information associated with the WFAP to at least one SON server, the method further comprising: receiving, by the WFAP, neighbor base station identification
information; and
sending, to the at least one SON server, neighbor base station identification information.
6. The method of claim 1 , wherein the scanning results include MAC/PHY configuration information associated with the at least one neighbor base station.
7. The method of claim 1 , wherein the scanning results include updated neighbor base station identification information.
8. A method of configuring a WFAP, the method comprising:
authenticating, at at least one SON server, location information associated with the WFAP;
in response to location information authentication, requesting, from at least one femto management server, MAC/PHY configuration information associated with at least one neighbor base station;
in response to receiving MAC/PHY configuration information associated with the at least one neighbor base station, sending RF parameters to the WFAP, wherein the WFAP scans at least one neighbor base station based on the RF parameters;
receiving neighbor base station scanning results; based on neighbor base station scanning results, determining RF parameters and MAC/PHY configuration information associated with the WFAP; and
sending the MAC/PHY configuration information to the WFAP.
9. The method of claim 8, wherein the location information is based on neighbor base station identification information.
10. The method of claim 8, wherein the location information is based on a public IP address associated with the WFAP.
1 1. The method of claim 8, wherein the location information is based on GPS information.
12. The method of claim 8, wherein the RF parameters associated with the WFAP include transmit power information.
13. The method of claim 8, wherein the RF parameters associated with the WFAP include uplink center frequency information.
14. The method of claim 8, wherein the RF parameters associated with the WFAP include downlink center frequency information.
15. The method of claim 8, wherein the RF parameters associated with the WFAP include preamble sequence information.
16. The method of claim 8, wherein the RF parameters associated with the WFAP include cyclic prefix information.
17. A system for configuring a WFAP, the system comprising:
means for sending, to at least one SON server, location information associated with the WFAP, wherein, based on the location information, the at least one SON server obtains MAC/PHY configuration information associated with at least one neighbor base station;
means for receiving RF parameters from the at least one SON server; based on the received RF parameters, means for scanning at least one neighbor base station;
means for reporting, to the at least one SON server, scanning results, wherein based on the scanning results, the at least one SON server determines RF parameters and MAC/PHY configuration information associated with the WFAP; and
means for receiving the MAC/PHY configuration information from the at least one SON server.
18. The system of claim 17, wherein the location information is based on neighbor base station identification information.
19. The system of claim 17, wherein the location information is based on a WFAP public IP address.
20. The system of claim 17, wherein the location information is based on GPS information.
21. The system of claim 17, wherein the scanning results include MAC/PHY configuration information associated with the at least one neighbor base station.
22. The system of claim 17, wherein the scanning results include updated neighbor base station identification information.
23. The system of claim 17 further comprising:
means for receiving, by the WFAP, neighbor base station identification information; and
means for sending, to the at least one SON server, the neighbor base station identification information.
24. A system for configuring a WFAP, the system comprising:
means for authenticating location information associated with the WFAP;
in response to location information authentication, means for requesting MAC/PHY configuration information associated with at least one neighbor base station;
in response to receiving MAC/PHY configuration information associated with the at least one neighbor base station, means for sending RF parameters to the WFAP, wherein the WFAP scans at least one neighbor base station based on the RF parameters;
means for receiving neighbor base station scanning results;
based on neighbor base station scanning results, means for determining RF parameters and MAC/PHY configuration information associated with the WFAP; and
means for sending the MAC/PHY configuration information to the WFAP.
25. The system of claim 24, wherein the location information is based on neighbor base station identification information.
26. The system of claim 24, wherein the location information is based on a public IP address associated with the WFAP.
27. The system of claim 24, wherein the location information is based on GPS information.
28. The system of claim 24, wherein the RF parameters associated with the WFAP include transmit power information.
29. The system of claim 24, wherein the RF parameters associated with the WFAP include uplink center frequency information.
30. The system of claim 24, wherein the RF parameters associated with the WFAP include downlink center frequency information.
31. The system of claim 24, wherein the RF parameters associated with the WFAP include preamble sequence information.
32. The system of claim 24, wherein the RF parameters associated with the WFAP include cyclic prefix information.
PCT/US2010/060217 2009-12-14 2010-12-14 Method and system for wfap auto-configuration via neighbor base station auto-discovery WO2011075464A1 (en)

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US61/286,220 2009-12-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013060384A1 (en) * 2011-10-28 2013-05-02 Nokia Siemens Networks Oy Location verification in communication systems
US9210583B2 (en) 2011-12-06 2015-12-08 At&T Mobility Ii Llc Centralized femtocell optimization

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050148368A1 (en) * 2002-10-25 2005-07-07 Stefan Scheinert System and method for automatically configuring and integrating a radio base station into an existing wireless cellular communication network with full bi-directional roaming and handover capability
US20070254620A1 (en) * 2006-04-28 2007-11-01 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic Building of Monitored Set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050148368A1 (en) * 2002-10-25 2005-07-07 Stefan Scheinert System and method for automatically configuring and integrating a radio base station into an existing wireless cellular communication network with full bi-directional roaming and handover capability
US20070254620A1 (en) * 2006-04-28 2007-11-01 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic Building of Monitored Set

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013060384A1 (en) * 2011-10-28 2013-05-02 Nokia Siemens Networks Oy Location verification in communication systems
US9210583B2 (en) 2011-12-06 2015-12-08 At&T Mobility Ii Llc Centralized femtocell optimization
US9635563B2 (en) 2011-12-06 2017-04-25 At&T Mobility Ii Llc Centralized femtocell optimization

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