US9271204B2 - Mobility management based on radio link failure reporting - Google Patents

Mobility management based on radio link failure reporting Download PDF

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Publication number
US9271204B2
US9271204B2 US12/618,240 US61824009A US9271204B2 US 9271204 B2 US9271204 B2 US 9271204B2 US 61824009 A US61824009 A US 61824009A US 9271204 B2 US9271204 B2 US 9271204B2
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Prior art keywords
access point
message
access
mobility
measurement
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US12/618,240
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US20100124918A1 (en
Inventor
Parag A. Agashe
Nathan E. Tenny
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Qualcomm Inc
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Qualcomm Inc
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Priority to US12/618,240 priority Critical patent/US9271204B2/en
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to CN201410079921.1A priority patent/CN103796257B/zh
Priority to HUE09756619A priority patent/HUE047812T2/hu
Priority to KR1020117014102A priority patent/KR101432770B1/ko
Priority to PCT/US2009/064639 priority patent/WO2010057123A2/en
Priority to CN2009801457204A priority patent/CN102217354A/zh
Priority to JP2011536568A priority patent/JP5497056B2/ja
Priority to ES09756619T priority patent/ES2774185T3/es
Priority to CA2742503A priority patent/CA2742503C/en
Priority to RU2011124519/07A priority patent/RU2482625C2/ru
Priority to KR1020137010574A priority patent/KR20130062361A/ko
Priority to KR1020157036235A priority patent/KR101900381B1/ko
Priority to BRPI0921252-3A priority patent/BRPI0921252B1/pt
Priority to SI200932032T priority patent/SI2359626T1/sl
Priority to EP09756619.4A priority patent/EP2359626B1/en
Priority to DK09756619.4T priority patent/DK2359626T3/da
Priority to TW098139041A priority patent/TWI482507B/zh
Priority to TW103110332A priority patent/TWI544816B/zh
Assigned to QUALCOMM INCORPORATED reassignment QUALCOMM INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AGASHE, PARAG A., TENNY, NATHAN E.
Publication of US20100124918A1 publication Critical patent/US20100124918A1/en
Priority to ZA2011/04312A priority patent/ZA201104312B/en
Priority to JP2013230727A priority patent/JP5908451B2/ja
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Publication of US9271204B2 publication Critical patent/US9271204B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • 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
    • H04W36/0005—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
    • H04W36/08—Reselecting an access point
    • 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
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • H04W76/027—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • This application relates generally to wireless communication and more specifically, but not exclusively, to improving wireless mobility.
  • a wireless communication network is deployed over a defined geographical area to provide various types of services (e.g., voice, data, multimedia services, etc.) to users within that geographical area.
  • access points e.g., corresponding to different cells or sectors
  • access terminals e.g., cell phones
  • the access terminal will be served by a given one of these access points.
  • the access terminal may move away from its serving access point and move closer to another access point. In this case, the access terminal may be handed-over from its serving access point to be served by the other access point to maintain mobility for the access terminal.
  • the access terminal may regularly perform radio frequency (“RF”) measurements and determine that the signals being received from a neighbor access point (e.g., a so-called target access point) are stronger than the signals being received from the current serving access point by a certain margin. As a result, the access terminal sends a measurement report with this information to the network (e.g., to the serving access point).
  • the serving access point i.e., the source access point for the handover
  • the serving access point may send context information for the access terminal to the target access point.
  • the serving access point sends a handover command to the access terminal, wherein the handover command identifies the resources assigned to the access terminal on the target access point.
  • the access terminal may then connect to the target access point using these resources.
  • radio conditions between an access terminal and its serving access point may deteriorate to the point where the access terminal experiences radio link failure with the serving access point.
  • the access terminal may attempt to access a target access point.
  • the access terminal provides its own identification and the identity of the prior serving access point to the target access point.
  • the target access point may be able to serve the access terminal since the target access terminal may have context information and other data for the access terminal.
  • the target access point may reject the access terminal whereupon the access terminal may go to idle mode.
  • the target access point may perform a forward handover procedure, whereby the target access point fetches the context information for the access terminal from the prior serving access point.
  • the disclosure relates in some aspects to reporting radio link failure (hereafter, RLF).
  • RLF radio link failure
  • a source access point e.g., a source cell
  • the source access point may adjust its behavior (e.g., by adjusting mobility parameters) to improve mobility performance.
  • the serving access point may not be able to determine on its own that RLF occurred.
  • the disclosure relates in some aspects to a node that determines whether RLF occurred during connected state mobility of an access terminal and, if so, reports the RLF to another node.
  • a target access point e.g., a target cell
  • the target access point may send an RLF report message to the access point that was previously serving the access terminal (i.e., the source access point for the handover).
  • the serving access point may use the RLF information included in the message and, optionally, other RLF information that has been reported to the serving access point to keep track of handover performance, detect handovers that failed due to the absence of measurement reports from served access terminals, and adapt mobility parameters.
  • the serving access point may adjust measurement reporting parameters and handover parameters based on this RLF information (e.g., information regarding a particular RLF event or several RLF events where the target was unprepared).
  • RLF reporting may be advantageously employed to improve mobility performance in a network.
  • the target access point may send an RLF report to some other node (e.g., a network node such as an operations and maintenance entity).
  • the other node may send an RLF report message to the serving access point in some cases.
  • the other node may adjust mobility parameters it maintains based on the RLF information (and, optionally, other reported RLF information). In this case, the other node may send information relating to the adjusted mobility parameters to the serving access point.
  • FIG. 1 is a simplified block diagram of several sample aspects of a communication system adapted to support RLF reporting;
  • FIG. 2 is a flowchart of several sample aspects of operations that may be performed by a node in conjunction with reporting RLF;
  • FIG. 3 is a flowchart of several sample aspects of operations that may be performed by a node in conjunction with adapting mobility parameters based on reported RLF;
  • FIG. 4 is a flowchart of several sample aspects of operations that may be performed by a node in conjunction sending a message as a result of a received RLF report;
  • FIG. 5 is a simplified block diagram of several sample aspects of components that may be employed in communication nodes
  • FIG. 6 is a simplified block diagram of several sample aspects of communication components.
  • FIGS. 7-9 are simplified block diagrams of several sample aspects of apparatuses configured to facilitate improved mobility as taught herein.
  • an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
  • an aspect may comprise at least one element of a claim.
  • FIG. 1 illustrates several nodes of a sample communication system 100 (e.g., a portion of a communication network).
  • a sample communication system 100 e.g., a portion of a communication network.
  • access points may be referred to or implemented as base stations, eNodeBs, cells, or sectors, while access terminals may be referred to or implemented as user equipment or mobile stations, and so on.
  • Access points in the system 100 provide one or more services (e.g., network connectivity) for one or more wireless terminals (e.g., access terminal 102 ) that may be installed within or that may roam throughout a coverage area of the system 100 .
  • the access terminal 102 may connect to an access point 104 , an access point 106 , or some other access point (not shown in FIG. 1 ).
  • Each of the access points 104 and 106 may communicate with one or more network nodes (represented, for convenience, by network nodes 108 and 110 ) to facilitate wide area network connectivity.
  • These network nodes may take various forms such as, for example, one or more radio and/or core network entities.
  • a network node may represent functionality such as at least one of: network management (e.g., via an operations and maintenance (O&M) entity), call control, session management, mobility management, gateway functions, interworking functions, or some other suitable network functionality.
  • network management e.g., via an operations and maintenance (O&M) entity
  • call control e.g., via an operations and maintenance (O&M) entity
  • session management e.g., via an operations and maintenance (O&M) entity
  • mobility management e.g., via an operations and maintenance (O&M) entity
  • gateway functions e.g., via an operations and maintenance (O&M) entity
  • access points and, optionally, network nodes in the system 100 may include functionality to facilitate RLF reporting and adapting mobility parameters based on the RLF reporting.
  • access points in the system 100 may include RLF detection and reporting functionality 112 and, optionally, RLF-based parameter adaptation functionality 114 .
  • the access point 106 may send an RLF report to the access point 104 as represented by the dashed line 116 .
  • the RLF report is sent via one or more network nodes (as represented by network node 108 which may represent the backhaul). Based on this report and, optionally other RLF reports, the access point 104 may adapt one or more mobility parameters.
  • network nodes in the system 100 may include RLF-based parameter adaptation functionality 118 .
  • the access point 106 may send an RLF report to the network node 110 as represented by the dashed line 120 .
  • the network node 110 may forward the RLF report or RLF information collected by the network node 110 to the access point 104 (e.g., as represented by dashed line 122 ).
  • the network node 110 may adapt one or more mobility parameters and send mobility parameter information to the access point 104 (e.g., as represented by dashed line 122 ).
  • the access point 102 may simply use the provided mobility parameter information and may, therefore, not incorporate the functionality of block 114 .
  • this flowchart describes several sample operations that may be performed in conjunction with reporting RLF.
  • the operations of FIG. 2 may be described as being performed by specific components (e.g., components of the system 100 ). It should be appreciated, however, that these operations may be performed by other types of components and may be performed using a different number of components. It also should be appreciated that one or more of the operations described herein may not be employed in a given implementation.
  • the access point may be the serving access point for the access terminal as long as signaling conditions and other conditions (e.g., user selection) permit.
  • the radio conditions between the access terminal and the serving access point may deteriorate to the extent that the access terminal experiences RLF during connected state mobility.
  • This RLF event may or may not have been preceded by handover operations.
  • the network may not have determined that the access terminal should be handed-off to a target access point (e.g., based on measurement reports from the access terminal) before the RLF event.
  • the serving access point may not have even commenced a handover procedure.
  • handover operations may have commenced, but not completed at the time of the RLF event.
  • the target access point may not have been prepared for handover when the RLF occurred.
  • the target access point may simply be referred to as the “target” and the access point that served the access terminal immediately prior to RLF may be referred to as the “source” (even though a handover procedure may not have been commenced).
  • the access terminal may attempt to access a target to re-establish a radio link. For example, the access terminal may attempt to access the neighbor access point that currently has the highest received signal strength from the perspective of the access terminal.
  • the access terminal may send a message requesting connection re-establishment (e.g., a radio resource control (RRC) Connection Reestablishment Request) to the target.
  • RRC radio resource control
  • the access terminal may provide the target with an identifier of the access terminal and an identifier of the source.
  • the target may accept or reject the access terminal at this point. For example, if the target has been prepared for handover of the access terminal by the source, the target may accept the access terminal (e.g., the radio link is re-established at the target). In some implementations, the target may simply reject the access terminal if the target has not been prepared for handover. In other implementations, the target may perform a forward handover, whereby the target fetches the appropriate context from the source and completes the handover (e.g., re-establishes the radio link).
  • the target determines that RLF occurred during connected state mobility of the access terminal (e.g., during handover). The target may make this determination regardless of whether the access terminal was accepted or rejected. For example, if the access terminal was accepted at the target, the access terminal may inform the target of the RLF. If the access terminal was not accepted at the target, the target may infer that there was RLF based on, for example, the access terminal attempting to re-establish a radio link at the target, where the target was not prepared for handover. Also, in some implementations, the access request from the access terminal may indicate that RLF occurred.
  • the target collects information (e.g., statistical information) concerning RLFs that were detected by the target and/or handovers at the target.
  • the target may collect information regarding when RLFs occurred, how often RLFs occurred, which access terminals the RLFs were associated with, which sources the RLFs were associated with, the percentage of handovers that resulted in RLF, the percentage of handovers where the target was not prepared, and so on. Accordingly, the access terminal will update the information based on the determination of block 208 and other RLF determinations that are made over time.
  • the target reports the RLF to another node.
  • the target may send a report to the source (i.e., the source is the destination of the report message) or the target may send a report to a network node.
  • a report based on the determination of RLF at block 208 may include various types of information.
  • the report may indicate that a particular RLF event occurred (e.g., the most recent RLF), the report may comprise a collection of RLF events, the report may comprise statistical RLF information, or the report may include some other type of indication that an RLF occurred.
  • the report may include an indication of whether the target was prepared for the handover.
  • the report also may include information indicative of the nodes associated with the RLF.
  • the report may include an identifier of the access terminal, an identifier of the target (e.g., a physical cell identifier of the cell where the re-establishment attempt is made), an identifier of the source (e.g., a physical cell identifier of the cell in which the RLF occurred), or any combination of these identifiers.
  • an identifier of the access terminal e.g., a physical cell identifier of the cell where the re-establishment attempt is made
  • an identifier of the source e.g., a physical cell identifier of the cell in which the RLF occurred
  • the target may report RLF in different ways. For example, in some cases a dedicated RLF message may be used. In other cases, the RLF information may be explicitly or implicitly included in another message. For example, in cases where the target performs a context fetch because the target was not prepared for handover, the context fetch message from target to the source may serve as the RLF report (e.g., the context fetch explicitly or implicitly indicates that RLF occurred).
  • the report may be made via one or more messages.
  • a first set of information relating to the report as taught herein may be provided via one message while a second set of information relating to the report may be provided via another message.
  • the target may report RLF at various times. For example, a report may be sent in response to a trigger condition (e.g., a defined reporting trigger), at specific times (e.g., based on a reporting schedule), or based on some other condition or conditions. As a specific example, the target may send a report based on a trigger associated with detection of an RLF event (e.g., the report is sent soon after an RLF event is detected). As another example, the target may collect RLF information (e.g., statistics) over time and send the collected information together. This collected information may be sent, for example, at designated times (e.g., according to a periodic reporting schedule), upon collecting a certain amount of information, or at a time that is based on some other condition.
  • a trigger condition e.g., a defined reporting trigger
  • specific times e.g., based on a reporting schedule
  • some other condition or conditions e.g., the target may send a report based on a trigger associated with detection of an
  • the source receives a message from the target or another node (e.g., a network node) that indicates that RLF occurred.
  • the message may indicate that RLF occurred during connected state mobility (e.g., during handover) of an access terminal that was previously served by the source.
  • the message may include information about a specific RLF event, a collection of RLF events, RLF statistics, whether the target was prepared for handover, and so on.
  • the source may maintain a record of received RLF reports (e.g., based on information provided by the message received at block 302 and other similar messages). For example, the source may collect information regarding when RLFs occurred, how often RLFs occurred, which access terminals the RLFs were associated with, which targets the RLFs were associated with, and so on.
  • the source adapts one or more mobility parameters maintained at the source based on the message received at block 302 (e.g., based on information included in the message).
  • the mobility parameter may be adapted based on at least one of: a single RLF event reported by the message at block 302 , multiple RLF events as reported by the message at block 302 (and, optionally, other similar messages), statistical information as reported by the message at block 302 (and, optionally, other similar messages), or the record maintained at block 304 .
  • the source may improve mobility performance in the network. For example, handover performance may be improved since there may a reduction in the number of too-late handovers, the number of RLFs, and the number of handovers where the target access point is not prepared.
  • the source may adapt these mobility parameters at various times.
  • mobility parameters may be adapted in response to a trigger condition (e.g., a defined trigger), at specified times (e.g., based on an adaptation schedule), or based on some other condition or conditions.
  • a trigger condition e.g., a defined trigger
  • mobility parameters may be adapted based on a trigger associated with receipt of an RLF message (e.g., the mobility parameters are updated soon after the RLF message is received).
  • the source may update mobility parameters based on RLF information (e.g., statistics) collected over time.
  • the mobility parameters may be updated, for example, at designated times (e.g., according to a periodic adaptation schedule), upon collecting a certain amount of information, or at a time that is based on some other condition.
  • the mobility parameters may take various forms.
  • a mobility parameter may comprise a measurement reporting parameter or a mobility parameter.
  • a measurement reporting parameter may specify, for example, how access terminals are to determine whether to conduct a target measurement, how access terminals are to determine whether to report a target measurement, or how access terminals are to determine when to report a target measurement.
  • a measurement reporting parameter may comprise one or more reporting trigger thresholds (e.g., a received signal strength threshold that an access terminal compares to the received signal strength of pilot signals received from potential targets, or a time-to-trigger delay value).
  • a handover parameter may comprise, for example, a handover performance target (or the current deviation from a performance target) or a parameter that an access point uses to determine whether to perform a handover, uses to determine when to perform a handover, or uses to determine a target access point.
  • a handover parameter may comprise one or more reporting trigger thresholds (e.g., that are compared to the received signal strength of pilot signals an access terminal receives from a serving access point and/or potential targets).
  • a network node e.g., a network management node such as an O&M entity of a cellular network
  • receives an RLF report will be discussed.
  • the network node receives a message from the target that indicates that RLF occurred.
  • this message may indicate that RLF occurred during connected state mobility (e.g., during handover) of an access terminal that was previously served by the source.
  • the message may include information about a specific RLF event, a collection of RLF events, RLF statistics, whether the target was prepared for handover, and so on.
  • the network node may maintain a record of received RLF reports (e.g., based on information provided by the message received at block 402 and other similar messages).
  • the information collected here may be similar to the information described above at blocks 210 and 304 .
  • the network node may collect information regarding when RLFs occurred, how often RLFs occurred, which access terminals the RLFs were associated with, which sources the RLFs were associated with, the percentage of handovers that resulted in RLF, the percentage of handovers where the target was not prepared, and so on.
  • the network node adapts one or more mobility parameters to be used by one or more access points based on receipt of the message at block 402 .
  • the mobility parameter may be adapted based on at least one of: a single RLF event reported by the message at block 402 , multiple RLF events as reported by the message at block 402 (and, optionally, other similar messages), statistical information as reported by the message at block 402 (and, optionally, other similar messages), or the record maintained at block 404 .
  • the source may adapt these mobility parameters at various times.
  • mobility parameters may be adapted in response to a trigger condition, at specified times, or based on some other condition or conditions.
  • mobility parameters may be adapted based on a trigger associated with receipt of an RLF message or based on RLF information (e.g., statistics) collected over time.
  • RLF information e.g., statistics
  • the mobility parameters may be updated at designated times, upon collecting a certain amount of information, and so on.
  • the mobility parameters may take various forms as described above.
  • a mobility parameter may comprise a measurement reporting parameter or a mobility parameter.
  • the network node may control the adaptation of all of the mobility parameters used by one or more access points or may control the adaptation of only some of these mobility parameters. In the latter case, an access point may retain control over some of its mobility parameters.
  • the network node sends a message to the source based on receipt of the message at block 402 (e.g., based on information included in the message).
  • the network node may send an RLF report to the source or the network node may send updated mobility parameter information to the source.
  • the network node may simply forward the message received at block 402 (or the pertinent contents of that message) to the source. Accordingly, this message may indicate that RLF occurred during handover of the access terminal, RLF information (e.g., specific event, collection, or statistics information) received via the message and/or maintained at block 404 , and whether the target was prepared for handover.
  • RLF information e.g., specific event, collection, or statistics information
  • the network node may send the mobility parameter or parameters adapted at block 406 (or adjustments to the source's current parameters) to the source.
  • the source may update its mobility parameters upon receiving this message from the network node.
  • the network node may handle messages relating to one or more source access points.
  • the network node receives different messages directed to different source access points and forwards each of these messages to the appropriate access point.
  • the network node maintains separate records for different access points and independently updates mobility parameters for each of these access points.
  • the network node maintains a record for a set of several access points (e.g., that use common mobility parameters) and updates mobility parameters for that set of access points.
  • FIG. 5 illustrates several sample components that may be incorporated into nodes such as an access point 502 (e.g., corresponding to the access point 104 or the access point 106 ) and a network node 504 (e.g., corresponding to network node 110 and access point 104 ) to perform mobility operations as taught herein.
  • the described components also may be incorporated into other nodes in a communication system.
  • other nodes in a system may include components similar to those described for the access point 502 and the network node 504 to provide similar functionality.
  • a given node may contain one or more of the described components.
  • an access point may contain multiple transceiver components that enable the access point to operate on multiple frequencies and/or communicate via different technologies.
  • the access point 502 includes a transceiver 506 for communicating with other nodes.
  • the transceiver 506 includes a transmitter 508 for sending signals (e.g., pilots and messages) and a receiver 510 for receiving signals (e.g., connection requests and other messages).
  • the access point 502 and the network node 504 also include network interfaces 512 and 514 , respectively, for communicating with one another or other network nodes.
  • the network interfaces 512 and 514 may be configured to communicate with one or more network nodes via a wired or wireless backhaul.
  • the access point 502 and the network node 504 also include other components that may be used in conjunction with mobility operations as taught herein.
  • the access point 502 and the network node 504 may include communication controllers 516 and 518 , respectively, for managing communication with other nodes (e.g., sending and receiving RLF messages, mobility parameters, and other messages or indications) and for providing other related functionality as taught herein.
  • the access point 502 may include a mobility controller 520 (e.g., corresponding in some aspects to the functionality of block 112 and/or blocks 114 of FIG. 1 ) for managing mobility-related operations (e.g., determining that RLF occurred, collecting statistics, adapting mobility parameters, maintaining RLF records) and for providing other related functionality as taught herein.
  • the network node 504 may include a mobility controller 522 (e.g., corresponding in some aspects to the functionality of block 118 of FIG. 1 ) for managing mobility-related operations (e.g., sending a message based on receipt of an RLF message, maintaining statistics, adapting mobility parameters) and for providing other related functionality as taught herein.
  • a mobility controller 522 e.g., corresponding in some aspects to the functionality of block 118 of FIG. 1
  • managing mobility-related operations e.g., sending a message based on receipt of an RLF message, maintaining statistics, adapting mobility parameters
  • a given component depicted in FIG. 5 may include the functionality of multiple components as described herein.
  • the illustrated components for the access point 502 may provide functionality for reporting RLF (e.g., the functionality described above for access point 106 ) and/or functionality for adapting mobility parameters (e.g., the functionality described above for access point 104 ).
  • FIG. 5 may be implemented in one or more processors (e.g., that uses and/or incorporates data memory).
  • processors e.g., that uses and/or incorporates data memory.
  • the functionality of blocks 512 , 516 , and 520 may be implemented by a processor or processors in an access point, while the functionality of blocks 514 , 518 , and 522 may be implemented by a processor or processors in a network node.
  • each terminal may communicate with one or more access points via transmissions on the forward and reverse links.
  • the forward link refers to the communication link from the access points to the terminals
  • the reverse link refers to the communication link from the terminals to the access points.
  • This communication link may be established via a single-in-single-out system, a multiple-in-multiple-out (MIMO) system, or some other type of system.
  • MIMO multiple-in-multiple-out
  • a MIMO system employs multiple (N T ) transmit antennas and multiple (N R ) receive antennas for data transmission.
  • a MIMO channel formed by the N T transmit and N R receive antennas may be decomposed into N S independent channels, which are also referred to as spatial channels, where N S ⁇ min ⁇ N T , N R ⁇ .
  • Each of the N S independent channels corresponds to a dimension.
  • the MIMO system may provide improved performance (e.g., higher throughput and/or greater reliability) if the additional dimensionalities created by the multiple transmit and receive antennas are utilized.
  • a MIMO system may support time division duplex (TDD) and frequency division duplex (FDD).
  • TDD time division duplex
  • FDD frequency division duplex
  • the forward and reverse link transmissions are on the same frequency region so that the reciprocity principle allows the estimation of the forward link channel from the reverse link channel. This enables the access point to extract transmit beam-forming gain on the forward link when multiple antennas are available at the access point.
  • FIG. 6 illustrates a wireless device 610 (e.g., an access point) and a wireless device 650 (e.g., an access terminal) of a sample MIMO system 600 .
  • traffic data for a number of data streams is provided from a data source 612 to a transmit (TX) data processor 614 .
  • TX transmit
  • Each data stream may then be transmitted over a respective transmit antenna.
  • the TX data processor 614 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.
  • the coded data for each data stream may be multiplexed with pilot data using OFDM techniques.
  • the pilot data is typically a known data pattern that is processed in a known manner and may be used at the receiver system to estimate the channel response.
  • the multiplexed pilot and coded data for each data stream is then modulated (i.e., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QSPK, M-PSK, or M-QAM) selected for that data stream to provide modulation symbols.
  • the data rate, coding, and modulation for each data stream may be determined by instructions performed by a processor 630 .
  • a data memory 632 may store program code, data, and other information used by the processor 630 or other components of the device 610 .
  • the modulation symbols for all data streams are then provided to a TX MIMO processor 620 , which may further process the modulation symbols (e.g., for OFDM).
  • the TX MIMO processor 620 then provides N T modulation symbol streams to N T transceivers (XCVR) 622 A through 622 T.
  • XCVR N T transceivers
  • the TX MIMO processor 620 applies beam-forming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
  • Each transceiver 622 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.
  • N T modulated signals from transceivers 622 A through 622 T are then transmitted from N T antennas 624 A through 624 T, respectively.
  • the transmitted modulated signals are received by N R antennas 652 A through 652 R and the received signal from each antenna 652 is provided to a respective transceiver (XCVR) 654 A through 654 R.
  • Each transceiver 654 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.
  • a receive (RX) data processor 660 then receives and processes the N R received symbol streams from N R transceivers 654 based on a particular receiver processing technique to provide N T “detected” symbol streams.
  • the RX data processor 660 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for the data stream.
  • the processing by the RX data processor 660 is complementary to that performed by the TX MIMO processor 620 and the TX data processor 614 at the device 610 .
  • a processor 670 periodically determines which pre-coding matrix to use (discussed below). The processor 670 formulates a reverse link message comprising a matrix index portion and a rank value portion.
  • a data memory 672 may store program code, data, and other information used by the processor 670 or other components of the device 650 .
  • the reverse link message may comprise various types of information regarding the communication link and/or the received data stream.
  • the reverse link message is then processed by a TX data processor 638 , which also receives traffic data for a number of data streams from a data source 636 , modulated by a modulator 680 , conditioned by the transceivers 654 A through 654 R, and transmitted back to the device 610 .
  • the modulated signals from the device 650 are received by the antennas 624 , conditioned by the transceivers 622 , demodulated by a demodulator (DEMOD) 640 , and processed by a RX data processor 642 to extract the reverse link message transmitted by the device 650 .
  • the processor 630 determines which pre-coding matrix to use for determining the beam-forming weights then processes the extracted message.
  • FIG. 6 also illustrates that the communication components may include one or more components that perform mobility operations as taught herein.
  • a mobility control component 690 may cooperate with the processor 630 and/or other components of the device 610 to send/receive signals to/from another device (e.g., device 650 ) as taught herein.
  • another device e.g., device 650
  • the functionality of two or more of the described components may be provided by a single component.
  • a single processing component may provide the functionality of the mobility control component 690 and the processor 630 .
  • the processor 630 and the memory 632 may collectively provide mobility-related and other functionality as taught herein for the device 610 .
  • teachings herein may be incorporated into various types of communication systems and/or system components.
  • 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).
  • 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 (OFDMA) systems, or other multiple access techniques.
  • CDMA Code Division Multiple Access
  • MCCDMA Multiple-Carrier CDMA
  • W-CDMA Wideband CDMA
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • SC-FDMA Single-Carrier FDMA
  • OFDMA Orthogonal Frequency Division Multiple Access
  • 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
  • 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).
  • LCR Low Chip Rate
  • 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).
  • GSM Global System for Mobile Communications
  • 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.
  • E-UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (UMTS).
  • LTE Long Term Evolution
  • UMB Ultra-Mobile Broadband
  • LTE is a release of UMTS that uses E-UTRA.
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named “3rd Generation Partnership Project” (3GPP), while cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • 3GPP e.g., Re199, Re15, Re16, Re17
  • 3GPP2 e.g., 1xRTT, 1xEV-DO RelO, RevA, RevB
  • a node e.g., a wireless node
  • a node implemented in accordance with the teachings herein may comprise an access point or an access terminal.
  • an access terminal may comprise, be implemented as, or known as user equipment, a subscriber station, a subscriber unit, a mobile station, a mobile, a mobile node, a remote station, a remote terminal, a user terminal, a user agent, a user device, or some other terminology.
  • an access terminal may comprise a cellular telephone, 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, or some other suitable processing device connected to a wireless modem.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • a phone e.g., a cellular phone or smart phone
  • a computer e.g., a laptop
  • a portable communication device e.g., a portable computing device
  • an entertainment device e.g., a music device, a video device, or a satellite radio
  • a global positioning system device e.g., a global positioning system device, or any other suitable device that is configured to communicate via a wireless medium.
  • An access point may comprise, be implemented as, or known as a NodeB, an eNodeB, a radio network controller (RNC), a base station (BS), a radio base station (RBS), a base station controller (BSC), a base transceiver station (BTS), a transceiver function (TF), a radio transceiver, a radio router, a basic service set (BSS), an extended service set (ESS), a macro cell, a macro node, a Home eNB (HeNB), a femto cell, a femto node, a pico node, or some other similar terminology.
  • a node may comprise an access node for a communication system.
  • Such an access node may provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link to the network.
  • a network e.g., a wide area network such as the Internet or a cellular network
  • an access node may enable another node (e.g., an access terminal) to access a network or some other functionality.
  • the nodes may be portable or, in some cases, relatively non-portable.
  • a wireless node may be capable of transmitting and/or receiving information in a non-wireless manner (e.g., via a wired connection).
  • a receiver and a transmitter as discussed herein may include appropriate communication interface components (e.g., electrical or optical interface components) to communicate via a non-wireless medium.
  • a wireless node may communicate via one or more wireless communication links that are based on or otherwise support any suitable wireless communication technology.
  • a wireless node may associate with a network.
  • the network may comprise a local area network or a wide area network.
  • a wireless device may support or otherwise use one or more of a variety of wireless communication technologies, protocols, or standards such as those discussed herein (e.g., CDMA, TDMA, OFDM, OFDMA, WiMAX, Wi-Fi, and so on).
  • a wireless node may support or otherwise use one or more of a variety of corresponding modulation or multiplexing schemes.
  • a wireless node may thus include appropriate components (e.g., air interfaces) to establish and communicate via one or more wireless communication links using the above or other wireless communication technologies.
  • a wireless node may comprise a wireless transceiver with associated transmitter and receiver components that may include various components (e.g., signal generators and signal processors) that facilitate communication over a wireless medium.
  • apparatuses 700 , 800 , and 900 are represented as a series of interrelated functional modules.
  • an RLF determining module 702 and a statistical information collecting module 706 may correspond at least in some aspects to, for example, a mobility controller (e.g., controller 520 ) as discussed herein.
  • An RLF reporting module 704 may correspond at least in some aspects to, for example, a communication controller (e.g., controller 516 ) as discussed herein.
  • An RLF message receiving module 802 may correspond at least in some aspects to, for example, a communication controller (e.g., controller 516 ) as discussed herein.
  • a mobility parameter adapting module 804 and an RLF record maintaining module 806 may correspond at least in some aspects to, for example, a mobility controller (e.g., controller 520 ) as discussed herein.
  • An RLF message receiving module 902 may correspond at least in some aspects to, for example, a communication controller (e.g., controller 518 ) as discussed herein.
  • a message sending module 904 , a statistical information maintaining module 906 , and a mobility parameter adapting module 908 may correspond at least in some aspects to, for example, a mobility controller (e.g., controller 522 ) as discussed herein.
  • the functionality of the modules of FIGS. 7-9 may be implemented in various ways consistent with the teachings herein.
  • the functionality of these modules may be implemented as one or more electrical components.
  • the functionality of these blocks may be implemented as a processing system including one or more processor components.
  • the functionality of these modules may be implemented using, for example, at least a portion of one or more integrated circuits (e.g., an ASIC).
  • an integrated circuit may include a processor, software, other related components, or some combination thereof.
  • the functionality of these modules also may be implemented in some other manner as taught herein.
  • one or more of any dashed blocks in FIGS. 7-9 are optional.
  • any reference to an element herein using a designation such as “first,” “second,” and so forth does not generally limit the quantity or order of those elements. Rather, these designations may be used herein as a convenient method of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements may be employed there or that the first element must precede the second element in some manner. Also, unless stated otherwise a set of elements may comprise one or more elements. In addition, terminology of the form “at least one of: A, B, or C” used in the description or the claims means “A or B or C or any combination of these elements.”
  • any of the various illustrative logical blocks, modules, processors, means, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two, which may be designed using source coding or some other technique), various forms of program or design code incorporating instructions (which may be referred to herein, for convenience, as “software” or a “software module”), or combinations of both.
  • software or a “software module”
  • various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
  • the various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within or performed by an integrated circuit (IC), an access terminal, or an access point.
  • the IC may comprise a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute codes or instructions that reside within the IC, outside of the IC, or both.
  • 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.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • 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 media 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.
  • any connection is properly termed a computer-readable medium.
  • the 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
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • 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 reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. It should be appreciated that a computer-readable medium may be implemented in any suitable computer-program product.

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US12/618,240 2008-11-17 2009-11-13 Mobility management based on radio link failure reporting Active 2031-12-14 US9271204B2 (en)

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US12/618,240 US9271204B2 (en) 2008-11-17 2009-11-13 Mobility management based on radio link failure reporting
EP09756619.4A EP2359626B1 (en) 2008-11-17 2009-11-16 Mobility management based on radio link failure reporting
SI200932032T SI2359626T1 (sl) 2008-11-17 2009-11-16 Upravljanje mobilnosti na podlagi obvestila o izpadu radijske zveze
PCT/US2009/064639 WO2010057123A2 (en) 2008-11-17 2009-11-16 Mobility management based on radio link failure reporting
HUE09756619A HUE047812T2 (hu) 2008-11-17 2009-11-16 Mobilitás menedzsment rádiós kapcsolati hiba jelentése alapján
JP2011536568A JP5497056B2 (ja) 2008-11-17 2009-11-16 無線リンク障害報告に基づくモビリティ管理
ES09756619T ES2774185T3 (es) 2008-11-17 2009-11-16 Gestión de movilidad basada en informe de fallos de enlace de radio
DK09756619.4T DK2359626T3 (da) 2008-11-17 2009-11-16 Mobilitetsforvaltning baseret på radioforbindelsesforstyrrelses-rapportering
RU2011124519/07A RU2482625C2 (ru) 2008-11-17 2009-11-16 Управление мобильностью на основе уведомления о нарушении линии радиосвязи
KR1020137010574A KR20130062361A (ko) 2008-11-17 2009-11-16 무선 링크 실패 보고에 기반한 이동성 관리
CN201410079921.1A CN103796257B (zh) 2008-11-17 2009-11-16 基于无线电链路故障报告的移动性管理
BRPI0921252-3A BRPI0921252B1 (pt) 2008-11-17 2009-11-16 Gerenciamento de mobilidade com base em relatório de falha de enlace de rádio
KR1020117014102A KR101432770B1 (ko) 2008-11-17 2009-11-16 무선 링크 실패 보고에 기반한 이동성 관리
CN2009801457204A CN102217354A (zh) 2008-11-17 2009-11-16 基于无线电链路故障报告的移动性管理
CA2742503A CA2742503C (en) 2008-11-17 2009-11-16 Mobility management based on radio link failure reporting
KR1020157036235A KR101900381B1 (ko) 2008-11-17 2009-11-16 무선 링크 실패 보고에 기반한 이동성 관리
TW098139041A TWI482507B (zh) 2008-11-17 2009-11-17 基於無線電鏈路故障報告的行動性管理
TW103110332A TWI544816B (zh) 2008-11-17 2009-11-17 基於無線電鏈路故障報告的行動性管理
ZA2011/04312A ZA201104312B (en) 2008-11-17 2011-06-09 Mobility management based on radio link failure reporting
JP2013230727A JP5908451B2 (ja) 2008-11-17 2013-11-06 無線リンク障害報告に基づくモビリティ管理

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