US20130225182A1 - Method and system for joint parameter optimization for macro and femto cells - Google Patents

Method and system for joint parameter optimization for macro and femto cells Download PDF

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US20130225182A1
US20130225182A1 US13/773,577 US201313773577A US2013225182A1 US 20130225182 A1 US20130225182 A1 US 20130225182A1 US 201313773577 A US201313773577 A US 201313773577A US 2013225182 A1 US2013225182 A1 US 2013225182A1
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Prior art keywords
cell
parameters
femtocells
optimizing
femtocell
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Damanjit Singh
Peerapol Tinnakornsrisuphap
Mehmet Yavuz
Christophe Chevallier
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/US2013/027517 priority patent/WO2013126845A1/fr
Priority to TW102106435A priority patent/TW201338578A/zh
Assigned to QUALCOMM INCORPORATED reassignment QUALCOMM INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEVALLIER, CHRISTOPHE, TINNAKORNSRISUPHAP, PEERAPOL, YAVUZ, MEHMET, SINGH, DAMANJIT
Publication of US20130225182A1 publication Critical patent/US20130225182A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/247—Reselection being triggered by specific parameters by using coverage extension
    • 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

  • This disclosure relates generally to the field of wireless communications and more specifically to the system and methods for joint parameter optimization for collocated macrocell and femtocell deployments.
  • Wireless communication systems are widely deployed to provide various types of communication content such as, for example, voice, data, and so on.
  • Typical wireless communication systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.).
  • multiple-access systems may include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and the like.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the systems can conform to specifications such as third generation partnership project (3GPP), 3GPP long term evolution (LTE), ultra mobile broadband (UMB), evolution data optimized (EV-DO), etc.
  • 3GPP third generation partnership project
  • LTE 3GPP long term evolution
  • UMB ultra mobile broadband
  • EV-DO evolution data optimized
  • wireless multiple-access communication systems may simultaneously support communication for multiple mobile devices.
  • Each mobile device may communicate with one or more base stations (e.g., which can be commonly referred as macrocells).
  • base stations e.g., which can be commonly referred as macrocells.
  • additional low power base stations e.g., which can be commonly referred as femtocells or picocells
  • femtocells or picocells can be deployed to provide more robust wireless coverage to mobile devices.
  • low power base stations can be deployed for incremental capacity growth, richer user experience, in-building or other specific geographic coverage, and/or the like.
  • these low power base stations are often deployed in homes, offices, etc. without consideration of a current network environment.
  • cell parameters such as handover or cell reselection parameters
  • handover or cell reselection parameters are typically manually configured by an operator after performing some field tests or simulations.
  • each femtocell typically autonomously learns its environment and configures many of its parameters.
  • Manual configuration for femtocells is generally too difficult and costly due to their large number and random anywhere installation.
  • joint optimization of femtocell and macrocell parameters is desired.
  • configuration of macrocells can help configuration of femtocells and vice versa.
  • a method for joint parameter optimization for collocated macrocells and femtocells in a wireless communication network comprises: collecting one or more performance parameters from the one or more collocated macrocells and femtocells, detecting frequent cell reselections or frequent cell handovers by mobile devices between the one or more collocated macrocells and femtocells, optimizing one or more cell reselection and handover parameters for the one or more collocated macrocells and femtocells based on the performance parameters, and overwriting one or more corresponding parameters of the collocated macrocells and femtocells with the one or more optimized cell reselection and handover parameters, thereby reducing frequent cell reselections or frequent cell handovers by mobile devices between the one or more collocated macrocells and femtocells in a wireless communication network.
  • an apparatus may include one or more means for performing the above-noted actions of the method.
  • a computer program product may include a computer-readable medium having one or more codes for performing the above-noted actions of the method
  • an apparatus for wireless communication may include a parameter collection component configured to collect one or more performance parameters from one or more collocated macrocells and femtocells in a wireless communication network. Further, the apparatus may include a parameter optimization component configured to detect frequent cell reselections or frequent cell handovers by mobile devices between the one or more collocated macrocells and femtocells, and to optimize one or more of cell reselection and handover parameters for the one or more collocated macrocells and femtocells based on the performance parameters. Additionally, the apparatus may include a parameter overwriting component configured to overwrite one or more corresponding parameters of the collocated macrocells and femtocells with the one or more of optimized cell reselection and handover parameters.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a block diagram of an example wireless communication system having collocated macrocell and femtocell deployments.
  • FIG. 2A is a block diagram of an example aspect of a system for joint optimization of parameters for collocated macrocells and femtocells.
  • FIG. 2B is a block diagram of an example aspect of the parameter optimization component of the system for joint optimization of parameters for collocated macrocells and femtocells.
  • FIGS. 3A and 3B are diagrams of various example aspect of joint optimization of cell reselection parameters for collocated macrocell and femtocells.
  • FIG. 4 is a flow chart of one example aspect of a method for joint optimization of parameters for collocated macrocells and femtocells.
  • FIG. 5 is block diagram of example systems for joint optimization of parameters for collocated macrocells and femtocells.
  • FIG. 6 is a block diagram of an example wireless communication system in accordance with various aspects set forth herein.
  • FIG. 7 is an illustration of an example wireless network environment that can be employed in conjunction with the various systems and methods described herein.
  • FIG. 8 illustrates an example wireless communication system, configured to support a number of devices, in which the aspects herein can be implemented.
  • FIG. 9 is an illustration of an exemplary communication system to enable deployment of femtocells within a network environment.
  • FIG. 10 illustrates an example of a coverage map having several defined tracking areas.
  • a CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc.
  • UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA.
  • W-CDMA Wideband-CDMA
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM®, etc.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • WiMAX IEEE 802.16
  • Flash-OFDM® Flash-OFDM®
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink.
  • UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP).
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • 3GPP2 3rd Generation Partnership Project 2
  • such wireless communication systems may additionally include peer-to-peer (e.g., mobile-to-mobile) ad hoc network systems often using unpaired unlicensed spectrums, 802.xx wireless LAN, BLUETOOTH and any other short- or long-range, wireless communication techniques.
  • the wireless communication system(s) may include a plurality of base stations (BS) utilized for communicating with mobile devices(s). These base stations may include high-power macro BS and low-power femto BS.
  • the femto BS also be referred to as an access point, femto nodes, pico node, micro node, a Node B, evolved Node B (eNB), home Node B (HNB) or home evolved Node B (HeNB), collectively referred to as H(e)NB, or some other terminology.
  • eNB evolved Node B
  • HNB home Node B
  • HeNB home evolved Node B
  • H(e)NB home evolved Node B
  • H(e)NB home evolved Node B
  • a low-power base station transmits at a relatively low power as compared to a macro base station associated with a wireless wide area network (WWAN).
  • WWAN wireless wide area network
  • the coverage area of the low power base station can be substantially smaller than the coverage area of a macro base station.
  • a mobile device can also be called a system, device, subscriber unit, subscriber station, mobile station, mobile, remote station, mobile terminal, remote terminal, access terminal, user terminal, terminal, communication device, user agent, user device, or user equipment (UE).
  • a mobile device may be a cellular telephone, a satellite phone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having wireless connection capability, a tablet, a computing device, or other processing devices connected via a wireless modem to one or more BS that provide cellular or wireless network access to the mobile device.
  • SIP Session Initiation Protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • FIG. 1 shows an example wireless communication system 100 having collocated macrocell and femtocell deployments.
  • System 100 includes a macro base station 102 , which forms a macrocell (not shown in FIG. 1 , but described in greater detail below with reference in FIG. 9 ), that can provide one or more mobile devices with access to a wireless network.
  • the communication system 100 also includes femto nodes 104 , 106 , 108 , 110 , and 112 , which can also provide wireless network access over a backhaul link (not shown) with a mobile network over a broadband internet connection.
  • femto nodes 104 , 106 , 108 , 110 , and/or 112 can be other types of low power base stations, a relay node, a device (e.g., communicating in peer-to-peer or ad-hoc mode with other devices), etc.
  • Each femto node forms a femtocell (not shown in FIG. 1 , but described in greater detail below with reference in FIG. 9 ).
  • the system 100 includes a mobile device 114 that communicates with macro base station 102 and one or more femto nodes 104 or 106 to receive wireless access to the wireless network.
  • frequent system reselections and handovers between macro base station 102 and the collocated femto nodes 104 , 106 , 108 , 110 , and 112 can happen by a fast-moving mobile device 114 (e.g., a vehicular mobile device) entering and leaving patchy femtocell coverage and/or mobile device 114 ping-ponging between the macrocell 102 and the femtocells 104 , 106 , 108 , 110 , and 112 .
  • a fast-moving mobile device 114 e.g., a vehicular mobile device
  • Frequent system reselections may be considered multiple attempts by a mobile device or attempt by a number of mobile devices to register and/or deregister with adjacent femtocells or macrocells within a short period of time (e.g. 10 minutes).
  • Frequent handover occur when mobile device actually transfer an ongoing call or data session between a macrocell and a femtocell or between two femtocells.
  • Frequent cell reselections and handovers are not desirable because they may cause frequent mobile device registrations on different systems (e.g., femtocell and macrocells), which in turn may cause device battery drainage, signaling load, missing of pages, and other problems. Therefore, it is desirable to perform joint optimization of femtocell and macrocell parameters to prevent above-described problems.
  • FIG. 2A illustrates an example system 200 for joint optimization of parameters for collocated macrocell(s) and femtocell(s) deployments.
  • the system 200 may be deployed in a macro node, a femto node, a mobile device, or core network (not shown).
  • the system 200 collects, at regular intervals, performance parameters for macrocells 210 and femtocell 220 using parameter collection component 202 .
  • the system 200 stores the collected parameters in a parameters database 204 .
  • the system 200 analyzes collected data to detect frequent cell reselections or handovers by mobile devices 230 .
  • the system 200 then identifies collocated macrocells 210 and femtocells 220 and optimizes parameters of these cells using parameter optimization component 206 in order to reduce frequent cell reselections and handovers between these cells.
  • the system 200 then overwrites modified parameters of macrocells 210 and femtmocells 220 based on results of joint parameter optimization using overwriting component 208 .
  • the parameter collection component 202 may use a communication interface (such as X2, S1, Iur, Iu, or the like) to obtain various performance parameters from macrocells 210 and femtocells 220 .
  • These performance parameters may include, but not limited to, the number of reselections, number of handovers, types of handovers (such as intra-frequency, inter-frequency, inter-RAT, handovers to/from macrocell, handovers to/from femtocells, and other), number of call drops, average UL interference, average cell capacity used and available cell capacity, number of users served by the cell, number of connections established, traffic pattern at backhaul or traffic pattern of mobile devices served, and other performance parameters.
  • a communication interface such as X2, S1, Iur, Iu, or the like
  • the parameter optimization component 206 may use network resources to identify a cluster of collocated macrocells and femtocells.
  • the collocated cell cluster may include, but not limited to, adjacent cells, overlapping cells, or more generally cells that have mutual impact with each other.
  • the parameter optimization component 206 then identifies performance and resource utilization trends within a cell cluster and, in response to the performance and resource utilization trends, changes parameters on macro and femto nodes to allow improved performances and/or even resource utilization within the cells of a cluster.
  • the component 206 then saves changed parameters in the database 204 and instructs parameter overwriting component 208 to communicate new parameters to the appropriate macro and femto cells 210 , 220 .
  • FIG. 2B illustrates one example aspect of the parameter optimization component.
  • the parameter optimization component 206 includes a cell reselection optimization component 242 and cell handover optimization component 244 .
  • the cell reselection optimization component 242 is operable to optimize such cell reselection parameters as Qhyst, Qqualmin, Qoffset, Treselection, HCS (Hierarchical Cell Structure), and the like. Optimization of cell reselection parameters is illustrated in the following example scenario. In a dedicated channel deployment, in which femtocells and macrocells are deployed on separate frequencies, femtocells deployed near a highway or freeway may get a lot of unnecessary reselections and registrations from mobile devices coming from a macrocell.
  • the reselection optimization component 242 may change cell reselection parameters to decrease signaling load and paging unreachability of femtocells. Based on joint optimization, neighboring macrocells can change cell reselection parameters to discourage mobile devices from going to femtocells. This can be accomplished via, for example, (i) increasing Qqualmin and/or Qoffset and/or Treselection parameters for femtocells; (ii) changing or lowering HCS priority of femtocells; and (iii) increasing a macrocell Qhyst or removing femtocells from a macrocell neighbor list.
  • joint parameter optimization can be used to force neighboring macrocells to choose cell reselection parameters that encourage mobile devices to go to femtocells.
  • femtocells can make cell reselection parameters sticky to discourage mobile devices from going to macrocells.
  • the parameter overwriting component 208 can broadcast optimized cell reselection parameters to the macrocells 210 and femtocells 220 in System Information Blocks (e.g., SIB1, SIB3, SIB11, SIB11bis).
  • SIB1, SIB3, SIB11, SIB11bis System Information Blocks
  • the cell reselection optimization component 242 may also optimize (e.g., reduce) frequency with which femtocell 220 transmits its reselection beacon, which will lower the probability that a fast-moving mobile device 230 will detect the reselection beacon transmitted by the femtocell 220 and reselect to that femtocell, and will delay femtocell reselection for slow-moving mobile devices 230 .
  • reselection beacons are periodically transmitted by femtocells on the same RF channel(s) as those used by a collocated macrocells in order to temporary jam (e.g., create interference with) RF signals transmitted by the macrocells and force mobile devices 230 located in the coverage area of the femtocell 220 and the collocated macrocell 210 to reselect from the serving macrocell 210 to the target femtocell 220 .
  • temporary jam e.g., create interference with
  • the cell reselection optimization component 242 may slow down cell reselections by adjusting cell reselection parameters used by the mobile device 230 to determine the time it needs to evaluate cell reselection criteria.
  • macrocell 210 may regulate (e.g., increase) a Treselection parameter used by mobile device 230 to determine the time it needs to evaluate cell reselection criteria.
  • the mobile device 230 uses Treselection parameter for intra-frequency, inter-frequency and inter-RAT reselections. In particular, the mobile device 230 continuously evaluates target cell quality in every DRX cycle for the Treselection time. Therefore, the Treselection parameter may be used to avoid pre-mature reselection to the target cell.
  • IE Inter-frequency ScalingFactor for Treselection
  • the cell reselection optimization component 242 can optimise (e.g., increase) Qqualmin parameter in order to shrink the perceived effective coverage area of the femtocell 220 , thereby preventing frequent reselections to that cell by fast-moving mobile devices 230 .
  • Qqualmin parameter is usually broadcasted per neighboring cell (or PSC) in SIB messages (e.g., SIB11) by the collocated macrocell.
  • SIB messages e.g., SIB11
  • Qqualmin parameter is can also be broadcasted by neighboring femtocells in its SIB messages.
  • Qqualmin indicates the signal-to-interference ratio (Ec/Io) or received signal power below which mobile device 230 considers the neighboring cell as unsuitable for reselection.
  • Qqualmin determines the “entry point” for cell reselections, thereby effectively controlling the reselection radius of the femtocell coverage.
  • the cell reselection optimization component 242 of the femto node 220 may provide power boosting to increase cells reselection radius.
  • a fixed high value of Qqualmin may impact discovery of slow moving mobile devices 230 because mobile devices that are reasonably closer to the femtocell 220 may not be able to reselect to it.
  • the cell reselection optimization component 242 may instruct the femto node 220 to periodically boost its pilot power momentarily to increase its reselection radius.
  • Such power boost can be coordinated with the transmission of the reselection beacon by the femtocell as described above. This is illustrated in FIG.
  • radius 302 corresponds to Qqualmin based “entry point” during normal operation (also shown in FIG. 3A ) that prevents reselection by fast moving mobile devices 230
  • radius 304 corresponds to Qqualmin based “entry point” during power-boosted beacon operation, which facilitates cell reselection for slow-moving mobile devices 230 .
  • the femto node 220 may prevent frequent reselections by rejecting at least the first registration attempt by idle-mode mobile device 230 .
  • the femto node 220 may check for any recent registration attempts by the mobile device 230 with the same ID and if no prior attempts took place respond to the mobile device with a “RRC Connection Reject” message.
  • the femto node 220 may accept the registration form the mobile device 230 .
  • RRC Connection Reject message can be sent with “Redirection info” and “Wait Time”.
  • the cell handover optimization component 244 is configured to optimize various handover parameters, such as ABS (Almost Blank Subframes) configuration, Hysteresis, Time-to-trigger (TTT), Cell individual offset, event offset (Ea3-offset), filter coefficient, frequency offset, and other parameters. Optimization of handover parameters is illustrated by the following example scenarios. As density of femtocells increases, to achieve more cell splitting gains, it may be desirable for macrocells to offload more to collocated femtocells.
  • Macrocells may need to provide more subframes to femtocells in case of eICIC (enhanced inter-Cell interference coordination) or ICIC (inter-cell interference coordination)—ABS configuration can be determined by the cell handover optimization component 244 based on the reported density of femtocells. Macrocells may need to encourage handover to femtocells. To that end, the cell handover optimization component 244 can configure hysteresis, Time-to-trigger (TTT), Cell individual offset, event offset (Ea3-offset), frequency offset, and other handover parameters.
  • TTTT Time-to-trigger
  • Ea3-offset event offset
  • frequency offset and other handover parameters.
  • the parameter overwriting component 208 can send optimized cell handover parameters to be broadcast in SIBs or to be sent via dedicated messages (e.g., Measurement Control message).
  • FIG. 4 shows an example method 400 for jointly optimizing one or more parameters of one or more collocated macro and femto cells, which can be implemented by system 200 ( FIG. 2 ).
  • method 400 includes collecting one or more performance parameters from one or more collocated macrocells and femtocells in a wireless communication network.
  • the system 200 collects, at some intervals, performance parameters for macrocells 210 and femtocell 220 using parameter collection component 202 .
  • method 400 includes storing the collected parameters in a parameters database.
  • the system 200 stores the collected parameters in a parameters database 204 .
  • method 400 includes identifying one or more collocated ones of the macrocells and femtocells.
  • parameter optimization component 206 may use network resources to identify a cluster of collocated macrocells and femtocells, and identify one or more collocated ones of the macrocells and femtocells.
  • method 400 includes detecting frequent cell reselections or frequent cell handovers by mobile devices between the one or more collocated macrocells and femtocells.
  • the system 200 may analyze collected data to detect frequent cell reselections or handovers by mobile devices 230 between collocated macro and femto cells.
  • method 400 includes optimizing one or more of cell reselection and handover parameters for the one or more collocated macrocells and femtocells based on the performance parameters. For example, in an aspect, the system 200 optimizes cell reselection and handover parameters of these cells based on collected performance parameters from various cells using parameter optimization component 206 in order to reduce frequent cell reselections and handovers between cells.
  • method 400 includes overwriting one or more corresponding parameters of the one or more collocated macrocells and femtocells with the one or more of optimized cell reselection and handover parameters. For example, in an aspect, the system 200 overwrites modified parameters of macrocells 210 and femtmocells 220 based on results of joint parameter optimization using overwriting component 208 .
  • FIG. 5 shows system 500 for jointly optimizing one or more parameters of one or more collocated macro and femto cells.
  • System 500 may be implemented in a macro node, such as node 210 ( FIG. 1 ), femto node, such as node 220 ( FIG. 1 ) or core network (not shown). It is to be appreciated that system 500 is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware).
  • System 500 includes a logical grouping 502 of electrical components that can act in conjunction.
  • logical grouping 502 can include: an electrical component 504 for collecting one or more performance parameters from macro cells and femto cells; an electrical component 504 for detecting frequent cell reselections or handovers, e.g. between the one or more collocated macro cells and femto cells; an electrical component 506 for optimizing one or more of cell reselection and handover parameters for the one or more collocated macro cells and femto cells; and an electrical component 508 for overwriting one or more corresponding parameters of the one or more collocated macro cells and femto cells with one or more of optimized cell reselection and handover parameters.
  • system 500 can include a memory 512 that retains instructions for executing functions associated with the electrical components 504 , 505 , 506 and 508 . While shown as being external to memory 512 , it is to be understood that one or more of the electrical components 504 , 505 , 506 and 508 can exist within memory 512 .
  • electrical components 504 , 505 , 506 and 508 can comprise at least one processor, or each electrical component 504 , 505 , 506 and 508 can be a corresponding module of at least one processor.
  • electrical components 504 , 505 , 506 and 508 can be a computer program product comprising a computer readable medium, where each electrical component 504 , 505 , 506 and 508 can be corresponding code.
  • System 600 comprises a base station 602 , which may be a femto node, such as nodes 102 or 202 or system 500 , and may include the components and implement the functions described above with respect to FIGS. 1-5 .
  • base station 602 can include multiple antenna groups.
  • one antenna group can include antennas 604 and 606
  • another group can comprise antennas 608 and 610
  • an additional group can include antennas 612 and 614 .
  • Two antennas are illustrated for each antenna group; however, more or fewer antennas can be utilized for each group.
  • Base station 602 can additionally include a transmitter chain and a receiver chain, each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as is appreciated.
  • a transmitter chain and a receiver chain each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as is appreciated.
  • Base station 602 can communicate with one or more mobile devices such as mobile device 616 and mobile device 622 ; however, it is to be appreciated that base station 602 can communicate with substantially any number of mobile devices similar to mobile devices 616 and 622 .
  • Mobile devices 616 and 622 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 600 .
  • mobile device 616 is in communication with antennas 612 and 614 , where antennas 612 and 614 transmit information to mobile device 616 over a forward link 618 and receive information from mobile device 616 over a reverse link 620 .
  • mobile device 622 is in communication with antennas 604 and 606 , where antennas 604 and 606 transmit information to mobile device 622 over a forward link 624 and receive information from mobile device 622 over a reverse link 626 .
  • forward link 618 can utilize a different frequency band than that used by reverse link 620
  • forward link 624 can employ a different frequency band than that employed by reverse link 626 , for example.
  • forward link 618 and reverse link 620 can utilize a common frequency band and forward link 624 and reverse link 626 can utilize a common frequency band.
  • Each group of antennas and/or the area in which they are designated to communicate can be referred to as a sector of base station 602 .
  • antenna groups can be designed to communicate to mobile devices in a sector of the areas covered by base station 602 .
  • the transmitting antennas of base station 602 can utilize beamforming to improve signal-to-noise ratio of forward links 618 and 624 for mobile devices 616 and 622 .
  • base station 602 utilizes beamforming to transmit to mobile devices 616 and 622 scattered randomly through an associated coverage
  • mobile devices in neighboring cells can be subject to less interference as compared to a base station transmitting through a single antenna to all its mobile devices.
  • mobile devices 616 and 622 can communicate directly with one another using a peer-to-peer or ad hoc technology as depicted.
  • system 600 can be a multiple-input multiple-output (MIMO) communication system.
  • MIMO multiple-input multiple-output
  • FIG. 7 shows an example wireless communication system 700 in which systems and methods for joint optimization of parameters of collocated macro and femto cells can be used.
  • the wireless communication system 700 depicts one base station 710 , which can include a femto node, and one mobile device 750 for sake of brevity.
  • system 700 can include more than one base station and/or more than one mobile device, wherein additional base stations and/or mobile devices can be substantially similar or different from example base station 710 and mobile device 750 described below.
  • base station 710 and/or mobile device 750 can employ the systems ( FIGS. 1 , 2 , 3 , 5 , and 6 ) and/or methods ( FIG.
  • components or functions of the systems and/or methods described herein can be part of a memory 732 and/or 772 or processors 730 and/or 770 described below, and/or can be executed by processors 730 and/or 770 to perform the disclosed functions.
  • traffic data for a number of data streams is provided from a data source 712 to a transmit (TX) data processor 714 .
  • TX data processor 714 formats, codes, and interleaves the traffic data stream based on a particular coding scheme selected for that data stream to provide coded data.
  • the coded data for each data stream can be multiplexed with pilot data using orthogonal frequency division multiplexing (OFDM) techniques. Additionally or alternatively, the pilot symbols can be frequency division multiplexed (FDM), time division multiplexed (TDM), or code division multiplexed (CDM).
  • the pilot data is typically a known data pattern that is processed in a known manner and can be used at mobile device 750 to estimate channel response.
  • the multiplexed pilot and coded data for each data stream can be modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected for that data stream to provide modulation symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the data rate, coding, and modulation for each data stream can be determined by instructions performed or provided by processor 730 .
  • the modulation symbols for the data streams can be provided to a TX MIMO processor 720 , which can further process the modulation symbols (e.g., for OFDM). TX MIMO processor 720 then provides N T modulation symbol streams to N T transmitters (TMTR) 722 a through 722 t. In various embodiments, TX MIMO processor 720 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
  • Each transmitter 722 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. Further, N T modulated signals from transmitters 722 a through 722 t are transmitted from N T antennas 724 a through 724 t, respectively.
  • the transmitted modulated signals are received by N R antennas 752 a through 752 r and the received signal from each antenna 752 is provided to a respective receiver (RCVR) 754 a through 754 r.
  • Each receiver 754 conditions (e.g., filters, amplifies, and downconverts) a respective signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.
  • An RX data processor 760 can receive and process the N R received symbol streams from N R receivers 754 based on a particular receiver processing technique to provide N T “detected” symbol streams. RX data processor 760 can demodulate, deinterleave, and decode each detected symbol stream to recover the traffic data for the data stream. The processing by RX data processor 760 is complementary to that performed by TX MIMO processor 720 and TX data processor 714 at base station 710 .
  • the reverse link message can comprise various types of information regarding the communication link and/or the received data stream.
  • the reverse link message can be processed by a TX data processor 738 , which also receives traffic data for a number of data streams from a data source 736 , modulated by a modulator 780 , conditioned by transmitters 754 a through 754 r, and transmitted back to base station 710 .
  • the modulated signals from mobile device 750 are received by antennas 724 , conditioned by receivers 722 , demodulated by a demodulator 740 , and processed by a RX data processor 742 to extract the reverse link message transmitted by mobile device 750 . Further, processor 730 can process the extracted message to determine which precoding matrix to use for determining the beamforming weights.
  • Processors 730 and 770 can direct (e.g., control, coordinate, manage, etc.) operation at base station 710 and mobile device 750 , respectively. Respective processors 730 and 770 can be associated with memory 732 and 772 that store program codes and data. Processors 730 and 770 can also perform functionalities described herein to support selecting a paging area identifier for one or more femto nodes.
  • FIG. 8 illustrates a wireless communication system 800 , configured to support a number of users, in which the systems and methods for joint optimization of parameters of collocated macro and femto cells may be implemented.
  • the system 800 provides communication for multiple cells 802 , such as, for example, macro cells 802 A- 802 G, with each cell being serviced by a corresponding access node 804 (e.g., access nodes 804 A- 804 G).
  • access node 804 e.g., access nodes 804 A- 804 G
  • mobile devices 806 e.g., mobile devices 806 A- 806 L
  • Each mobile device 806 can communicate with one or more access nodes 804 on a forward link (FL) and/or a reverse link (RL) at a given moment, depending upon whether the mobile device 806 is active and whether it is in soft handoff, for example.
  • the wireless communication system 800 can provide service over a large geographic region.
  • some of the mobile devices 806 such as devices 806 A, 806 H, and 806 J, may be femto nodes, such as nodes 102 or 202 or system 500 , and may include the components and implement the functions described above with respect to FIGS. 1-5 .
  • FIG. 9 illustrates an exemplary communication system 900 where one or more femto nodes are deployed within a macro network environment and in which the systems and methods for joint optimization of parameters of collocated macro and femto cells can be implemented.
  • the system 900 includes multiple femto nodes 910 A and 910 B (e.g., femtocell nodes or H(e)NB) installed in a relatively small scale network environment (e.g., in one or more user residences 930 ), which, in one aspect, may correspond to femto nodes 104 , 106 , 108 , 110 , and 112 of FIGS. 1-5 .
  • femto nodes 910 A and 910 B e.g., femtocell nodes or H(e)NB
  • a relatively small scale network environment e.g., in one or more user residences 930
  • Each femto node 910 can be coupled to a wide area network 940 (e.g., the Internet) and a mobile operator core network 950 via a digital subscriber line (DSL) router, a cable modem, a wireless link, or other connectivity means (not shown).
  • DSL digital subscriber line
  • each femto node 910 can be configured to serve associated mobile devices 920 (e.g., mobile device 920 A) and, optionally, alien mobile devices 920 (e.g., mobile device 920 B).
  • access to femto nodes 910 can be restricted such that a given mobile device 920 can be served by a set of designated (e.g., home) femto node(s) 910 but may not be served by any non-designated femto nodes 910 (e.g., a neighbor's femto node).
  • a set of designated (e.g., home) femto node(s) 910 but may not be served by any non-designated femto nodes 910 (e.g., a neighbor's femto node).
  • FIG. 10 illustrates an example of a coverage map 1000 where several tracking areas 1002 (or routing areas or location areas) are defined, each of which includes several macro coverage areas 1004 .
  • areas of coverage associated with tracking areas 1002 A, 1002 B, and 1002 C are delineated by the wide lines and the macro coverage areas 1004 are represented by the hexagons.
  • the tracking areas 1002 also include femto coverage areas 1006 corresponding to respective femto nodes, such as nodes 102 or 202 or system 100 , and which may include the components and implement the functions described above with respect to FIGS. 1-5 .
  • each of the femto coverage areas 1006 (e.g., femto coverage area 1006 C) is depicted within a macro coverage area 1004 (e.g., macro coverage area 1004 B). It should be appreciated, however, that a femto coverage area 1006 may not lie entirely within a macro coverage area 1004 . In practice, a large number of femto coverage areas 1006 can be defined with a given tracking area 1002 or macro coverage area 1004 . Also, one or more pico coverage areas (not shown) can be defined within a given tracking area 1002 or macro coverage area 1004 .
  • the owner of a femto node 910 can subscribe to mobile service, such as, for example, 3G mobile service, offered through the mobile operator core network 950 .
  • the femto node 910 can be operated by the mobile operator core network 950 to expand coverage of the wireless network.
  • a mobile device 920 can be capable of operating both in macro environments and in smaller scale (e.g., residential) network environments.
  • the mobile device 920 can be served by a macro cell access node 960 or by any one of a set of femto nodes 910 (e.g., the femto nodes 910 A and 910 B that reside within a corresponding user residence 930 ).
  • a set of femto nodes 910 e.g., the femto nodes 910 A and 910 B that reside within a corresponding user residence 930 .
  • a standard macro cell access node e.g., node 960
  • a femto node e.g., node 910 A
  • a femto node 910 can be backward compatible with existing mobile devices 920 .
  • a femto node 910 can be deployed on a single frequency or, in the alternative, on multiple frequencies. Depending on the particular configuration, the single frequency or one or more of the multiple frequencies can overlap with one or more frequencies used by a macro cell access node (e.g., node 960 ).
  • an mobile device 920 can be configured to connect to a preferred femto node (e.g., the home femto node of the mobile device 920 ) whenever such connectivity is possible. For example, whenever the mobile device 920 is within the user's residence 930 , it can communicate with the home femto node 910 .
  • the mobile device 920 can continue to search for the most preferred network (e.g., femto node 910 ) using a Better System Reselection (BSR), which can involve a periodic scanning of available systems to determine whether better systems are currently available, and subsequent efforts to associate with such preferred systems.
  • BSR Better System Reselection
  • the mobile device 920 can limit the search for specific band and channel. For example, the search for the most preferred system can be repeated periodically.
  • the mobile device 920 selects the femto node 910 for camping within its coverage area.
  • a femto node can be restricted in some aspects.
  • a given femto node can only provide certain services to certain mobile devices.
  • a given mobile device can only be served by the macro cell mobile network and a defined set of femto nodes (e.g., the femto nodes 910 that reside within the corresponding user residence 930 ).
  • a femto node can be restricted to not provide, for at least one mobile device, at least one of: signaling, data access, registration, paging, or service.
  • a restricted femto node (which can also be referred to as a Closed Subscriber Group H(e)NB) is one that provides service to a restricted provisioned set of mobile devices. This set can be temporarily or permanently extended as necessary.
  • a Closed Subscriber Group (CSG) can be defined as the set of access nodes (e.g., femto nodes) that share a common access control list of mobile devices.
  • a channel on which all femto nodes (or all restricted femto nodes) in a region operate can be referred to as a femto channel.
  • an open femto node can refer to a femto node with no restricted association.
  • a restricted femto node can refer to a femto node that is restricted in some manner (e.g., restricted for association and/or registration).
  • a home femto node can refer to a femto node on which the mobile device is authorized to access and operate on.
  • a guest femto node can refer to a femto node on which a mobile device is temporarily authorized to access or operate on.
  • An alien femto node can refer to a femto node on which the mobile device is not authorized to access or operate on, except for perhaps emergency situations (e.g., 911 calls).
  • a home mobile device can refer to an mobile device that authorized to access the restricted femto node.
  • a guest mobile device can refer to a mobile device with temporary access to the restricted femto node.
  • An alien mobile device can refer to a mobile device that does not have permission to access the restricted femto node, except for perhaps emergency situations, for example, 911 calls (e.g., an access terminal that does not have the credentials or permission to register with the restricted femto node).
  • a pico node can provide the same or similar functionality as a femto node, but for a larger coverage area.
  • a pico node can be restricted, a home pico node can be defined for a given mobile device, and so on.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. Additionally, at least one processor may comprise one or more modules operable to perform one or more of the steps and/or actions described above.
  • An exemplary storage medium may be coupled to the processor, such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. Further, in some aspects, the processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions, methods, or algorithms described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium, which may be incorporated into a computer program product.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • substantially any connection may be termed a computer-readable medium.
  • software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave
  • DSL digital subscriber line
  • wireless technologies such as infrared, radio, and microwave
  • Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs usually reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be a component.
  • One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • the components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets, such as data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems by way of the signal.

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WO2013126811A1 (fr) 2013-08-29
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US20130225171A1 (en) 2013-08-29
US9220045B2 (en) 2015-12-22
EP2818004A1 (fr) 2014-12-31
US20130225172A1 (en) 2013-08-29
CN104170471A (zh) 2014-11-26
EP2818004B1 (fr) 2019-06-26
JP6030669B2 (ja) 2016-11-24
JP2015511473A (ja) 2015-04-16
CN104170471B (zh) 2019-01-04
KR20140126390A (ko) 2014-10-30

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