WO2011142544A2 - Transfert intercellulaire avec agrégation de porteuses - Google Patents

Transfert intercellulaire avec agrégation de porteuses Download PDF

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Publication number
WO2011142544A2
WO2011142544A2 PCT/KR2011/003115 KR2011003115W WO2011142544A2 WO 2011142544 A2 WO2011142544 A2 WO 2011142544A2 KR 2011003115 W KR2011003115 W KR 2011003115W WO 2011142544 A2 WO2011142544 A2 WO 2011142544A2
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WO
WIPO (PCT)
Prior art keywords
measurement
user equipment
carrier
wireless access
carrier frequency
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PCT/KR2011/003115
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English (en)
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WO2011142544A3 (fr
Inventor
Gert Jan Van Lieshout
Van Der Velde Himke
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB1007869.9A external-priority patent/GB2479601B/en
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP11780761.0A priority Critical patent/EP2569979A4/fr
Priority to RU2012147810/07A priority patent/RU2576385C2/ru
Priority to CA2798930A priority patent/CA2798930C/fr
Priority to CN201180023648.5A priority patent/CN102948214B/zh
Priority to JP2013510015A priority patent/JP2013526794A/ja
Priority to AU2011251152A priority patent/AU2011251152B2/en
Priority to US13/696,475 priority patent/US9661533B2/en
Priority to KR1020127029577A priority patent/KR101783289B1/ko
Publication of WO2011142544A2 publication Critical patent/WO2011142544A2/fr
Publication of WO2011142544A3 publication Critical patent/WO2011142544A3/fr

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/06Reselecting a communication resource in the serving access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035Resource allocation in a cooperative multipoint environment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0073Allocation arrangements that take into account other cell interferences
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0096Indication of changes in allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/02Selection of wireless resources by user or terminal

Definitions

  • the present invention relates generally to wireless networks, and more specifically to a method and apparatus for assisting handover in systems in wireless networks employing carrier aggregation.
  • Wireless networks in which a user equipment (UE) such as a mobile handset communicates via wireless links to a network of base stations or other wireless access points connected to a telecommunications network, have undergone rapid development through a number of generations of radio access technology.
  • UE user equipment
  • 2G second generation
  • GSM Global System for Mobile communications
  • GERA GSM Enhanced Data rates for GSM Evolution Radio Access
  • 3G third generation digital systems
  • UMTS Universal Mobile Telecommunications System
  • UTRA Universal Terrestrial Radio Access
  • Third generation standards provide for a greater throughput of data than is provided by second generation systems; this trend is continued with the proposals by the Third Generation Partnership Project (3GPP) of the Long Term Evolution (LTE) system, using E-UTRA (Evolved UTRA) radio access technology, which offers potentially greater capacity and additional features compared with the previous standards.
  • 3GPP Third Generation Partnership Project
  • E-UTRA Evolution-UTRA
  • WiMax systems using radio access technology to IEEE 802.16 also offer improvements over previous standards.
  • Modern wireless networks such as LTE and WiMax typically employ a modulation format such as Orthogonal Frequency Division Multiplexing (OFDM), which is applied to one or more carriers, and is used to provide radio resource that is allocated to links between a base station (in 3GPP terminology an eNB (E-UTRA Network Node B)) and one or more user equipments.
  • OFDM Orthogonal Frequency Division Multiplexing
  • radio resource to connect a user equipment to a base station is allocated from one carrier.
  • it is proposed to aggregate two or more carriers to provide yet more capacity, and more flexible allocation of radio resource.
  • Carrier aggregation may also be employed by wireless systems other than LTE or WiMax.
  • Methods and apparatus are required to assist handover in wireless systems employing carrier aggregation.
  • a method of assisting handover of a user equipment from a source wireless access node to a target wireless access node for use in a wireless access network having a plurality of carrier frequencies and a plurality of cells in which a cell and a carrier frequency may be configured as a component carrier, and in which at least two component carriers may be aggregated for communication between the user equipment and the source wireless access node, the aggregated component carriers comprising a primary component carrier and at least one secondary component carrier, the method comprising:
  • a first carrier frequency to be configured as a primary component carrier for communication with the target wireless access node after handover
  • a second carrier frequency to be configured as a secondary component carrier for communication with the target wireless access node after handover.
  • An advantage of selecting, at the target wireless access node, a second carrier frequency to be configured as a secondary component carrier for communication with the target wireless access node after handover is that is that the target wireless access node may have information relating to resource availability at candidate frequencies and/or cells.
  • the method comprises selecting, at the source wireless access node, a cell for configuration as the primary component carrier for communication with the target wireless access node after handover.
  • the method comprises:
  • the method comprises:
  • the method comprises:
  • the measurement information comprises a list of items of information, each item relating to a combination of a cell and a carrier frequency, and the method comprises:
  • the method comprises:
  • the method comprises:
  • a method of reporting measurements from a user equipment for use in a wireless access network having a plurality of carrier frequencies comprising:
  • said measurement report relates at least to a carrier frequency other than the first carrier frequency.
  • said indicator indicates that the measurement report is required to relate to at least a carrier frequency other than the first carrier frequency.
  • said measurement report comprises measurements of carrier frequencies that the user equipment is configured to measure. This has an advantage that extra measurements may not be required to be taken.
  • said measurement report excludes one or more carrier frequency at which it has been determined that a best cell may not be identified.
  • said measurement report may exclude measurements that may not be required by some aspects of a handover process, since they may not be associated with an indication of a best cell.
  • the exclusion is based on whether signals are measured at least in a neighbouring cell. It may be necessary to measure signals in a neighbouring cell to a serving cell in order to determine a best cell.
  • said measurement report excludes one or more carrier frequencies for which signals are measured only from a serving cell.
  • Carrier frequencies for which signals are measured only from a serving cell may not be suitable for determining a best cell.
  • said measurement report comprises measurements of all carrier frequencies that the user equipment is configured to measure. This has an advantage that a simple indicator may indicate that all carrier frequencies that the user equipment is configured to measure should be included in a measurement report, without a need to use signalling resources listing required carrier frequencies.
  • the method comprises determining at the user equipment a selected cell for each carrier frequency included in said measurement report, and including in the measurement report each selected cell.
  • each selected cell is a best cell for a respective carrier frequency. This has an advantage that a best cell may be indicated to the network, which may be useful in support of handover.
  • the method comprises determining at the user equipment the selected cell for each carrier frequency on the basis of a measurement of a determined measurement quantity, wherein the determined measurement quantity is a received signal power if more than one measurement quantity is configured at the user equipment for a respective carrier frequency.
  • the method further comprises determining at the user equipment a plurality of selected cells for a carrier frequency on a basis of measurements of the determined measurement quantity, wherein the plurality of selected cells are included in said measurement report in an order derived from measurements of the determined measurement quantity.
  • the order may indicate to the network the relative merit of the selected cells, for example the best cell may appear first on the list. This information may be useful for example for handover preparation.
  • said indicator comprises an indication of carrier frequencies for which the user equipment is required to include measurements in said measurement report.
  • said indicator comprises a number of cells
  • the user equipment is required to include measurements in said measurement report relating to selected cells, the number of selected cells for a respective carrier frequency being the number of cells or fewer.
  • the first carrier frequency is not configured for use for communication between the user equipment and the wireless access network.
  • the method comprises configuring the user equipment such that said measurement report comprises measurements of a first quantity and not of a second quantity.
  • the user equipment may be configured to include only a quantity that is required in a measurement report, if multiple quantities are available.
  • the method comprises using an existing configuration of the user equipment to determine whether the measurement report comprises measurements of a first quantity or a second quantity. This has the advantage that signalling to indicate a quantity for inclusion in the measurement report may not be required.
  • said indicator indicates a measurement quantity that is required by the wireless access network and said measurement report conveyed from the user equipment to the wireless access network comprises a measurement of a first quantity and not a measurement of a second quantity related to the first carrier frequency.
  • the first quantity relates to received signal power
  • the second quantity relates to received signal quality
  • the first quantity relates to received signal quality
  • the second quantity relates to received signal power
  • the method further comprises receiving a message at the user equipment comprising an indication of a threshold and sending the second message in dependence on the measurement result exceeding the threshold.
  • a wireless access network having a plurality of carrier frequencies, the user equipment being arranged to:
  • the measurement report indicated by the indicator relates at least to a carrier frequency other than the first carrier frequency.
  • a cell and a carrier frequency may be configured as a component carrier, and in which at least two component carriers may be aggregated for communication, the aggregated component carriers comprising a primary component carrier and at least one secondary component carrier, the method comprising:
  • the measurement comparing a quantity at a first carrier frequency configured as the primary component carrier or the secondary component carrier with a quantity at a second carrier frequency at a neighbour frequency of the first carrier frequency;
  • the second frequency being configured as the primary or secondary component carrier after handover
  • the method comprises re-configuring the user equipment to perform a measurement at a carrier frequency other than the first carrier frequency dependent on communication from the wireless access network.
  • a cell and a carrier frequency may be configured as a component carrier, and in which at least two component carriers may be aggregated for communication, the aggregated component carriers comprising a primary component carrier and at least one secondary component carrier, the method comprising:
  • the measurement comparing a quantity at a first carrier frequency configured as the primary component carrier or the secondary component carrier with a quantity at a second carrier frequency at a neighbour frequency of the first carrier frequency;
  • the second frequency being configured as the primary or secondary component carrier after handover
  • the measurement comparing a quantity at the second carrier frequency configured as the primary component carrier or the secondary component carrier with a quantity at the first carrier frequency.
  • An advantage of selecting, at the target wireless access node, a second carrier frequency to be configured as a secondary component carrier for communication with the target wireless access node after handover is that is that the target wireless access node may have information relating to resource availability at candidate frequencies and/or cells.
  • Figure 1 is a schematic diagram illustrating a wireless access network featuring component carrier aggregation
  • Figure 2 is a schematic diagram illustrating signalling steps during handover
  • Figure 3 is a schematic diagram illustrating linking of a measurement object and a reporting configuration to a measurement identification
  • Figure 4 is a schematic diagram showing an example of a measurement configuration
  • Figure 5 is a schematic diagram showing an example of a measurement configuration after an autonomous update
  • Figure 6 is a schematic diagram showing an example of a measurement configuration as an embodiment of the invention.
  • Figure 7 is a schematic diagram showing an example of a measurement configuration after an autonomous update as an embodiment of the invention.
  • Figure 8 is a schematic diagram showing signalling in an embodiment of the invention.
  • Figure 9 is a schematic diagram showing signalling in an embodiment of the invention.
  • Figure 10 is a schematic diagram showing functional blocks of a user equipment.
  • Figure 11 is a schematic diagram showing functional blocks of a wireless access node.
  • the User Equipment In the LTE specifications in Release 8/9, the User Equipment (UE) is typically only connected to one cell, on one frequency, i.e. on one carrier. With the arrival of carrier aggregation, this situation changes, and the user equipment may be connected to one Primary Component Carrier (PCC) and one or more Secondary Component Carriers (SCCs). Suitable continuation of the different component carrier needs to be arranged at intra-LTE handover, that is to say from one LTE cell to another LTE cell.
  • PCC Primary Component Carrier
  • SCCs Secondary Component Carriers
  • the Primary Component Carrier should be changed, and if so, which node will decide which component carrier becomes the new Primary Component Carrier, what will be done with the Secondary Component Carriers, that is to say should they be continued, released or replaced by other component carriers, and what will be done with the measurement configuration that is configured at the user equipment at such a carrier aggregation handover.
  • Figure 1 shows a wireless access network 2 featuring component carrier aggregation.
  • Two wireless access nodes are shown, typically eNBs (EUTRAN node B) in the LTE system, a source wireless access node 6a, from which the user equipment 4 may be handed over, and a target wireless access node 6b, to which the wireless access node may be handed over.
  • the source eNB 6a has an associated coverage sector 8a, shown, and target eNB 6b has associated coverage sectors 8b and 8c shown.
  • a frequency f1, f2, or f3 may be available.
  • a cell may correspond to a coverage sector used at a particular frequency.
  • the network controls the mobility of a user equipment that is in connected mode (or, to be precise in RRC_CONNECTED state) i.e. the network decides with which cell the user equipment should maintain the radio connection (also referred to as the serving cell).
  • the network typically applies the handover procedure to move the user equipment from one cell, the serving cell, to another cell, the target cell.
  • the network typically decides the cell and the radio Access Technology (RAT) to which the user equipment should connect typically based on radio quality, but it may also take into account other factors e.g. cell load, user equipment capabilities, the type of bearers that are (being) established.
  • RAT radio Access Technology
  • the network normally configures the user equipment to perform measurements on the serving frequency, on other E-UTRA frequencies (referred to as inter-frequency measurements) and/ or on frequencies used by other Radio Access Technologies (referred to as inter-RAT measurements).
  • X2 handover is a
  • S1 handover may offer somewhat lower performance and may be more complex, but can be used even if no direct interface exists between source and target eNB (for example via a S1 link).
  • the X2 handover will now be described in more detail, for a system not employing carrier aggregation in order to illustrate shortcomings that may arise if carrier aggregation is introduced. Similar shortcomings may be present in the S1 handover case and thus embodiments of the invention may be applicable to both the X2 and S1 handover.
  • the user equipment sends a measurement report to the source eNB that it has detected a neighbouring cell that meets the measurement report triggering criteria. Based on the provided measurement information and other knowledge present in the source eNB, the source eNB can now decide whether to start a handover preparation or not.
  • the source eNB starts handover preparation, it will send a HANDOVER REQUEST message, to the target eNB.
  • This message carries the handover preparation information within the HandoverPreparationInformation message and includes: the user equipment radio access capabilities; the current radio access (i.e. access stratum, AS) configuration; the Radio Resource Management (RRM) configuration, i.e. information kept only by the eNB that is used primarily for Radio Resource Management. Usage of the information is up to eNB implementation; the Radio Access (AS) context i.e. information kept only by the eNB and not exchanged across the radio interface, e.g. information needed to perform RRC connection re-establishment; and the target cell identification.
  • AS Radio Access
  • the target eNB accepts the handover, it reserves the radio resources and decides the details of the radio access configuration to be used by the user equipment in the target cell. This configuration is returned to the source eNB within the HANDOVER REQUEST ACK message. This message carries the radio access configuration within the HandoverCommand message. The HandoverCommand message again carries an RRCConnectionReconfiguration message.
  • this message may include the radio access configuration to be used in the target cell. That is to say the message may include the measurement configuration, expressed by the delta, that is to say a difference, compared to the configuraton used in the source cell (i.e. the target eNB indicating changes in the measurement configuration).
  • the message may also comprise mobility control information, which may specify the target cell identity (by means of an cell identity) and characteristics (a frequency, a bandwidth and additional spectrum emission information, preferably if different from what is used in the source cell that is to say as a delta), the new radio access identity to be used in the target cell, the cell specific radio resource configuration (common for all user equipments), dedicated resources used for initial access in the target cell and a timer to limit the duration the user equipment tries connecting to the target cell.
  • mobility control information may specify the target cell identity (by means of an cell identity) and characteristics (a frequency, a bandwidth and additional spectrum emission information, preferably if different from what is used in the source cell that is to say as a delta), the new radio access identity to be used in the target cell, the cell specific radio resource configuration (common for all user equipments), dedicated resources used for initial access in the target cell and a timer to limit the duration the user equipment tries connecting to the target cell.
  • the message may also include the user equipment-specific radio resource configuration (i.e. the dedicated radio configuration), also expressed as a delta, that is to say a difference, compared to the configuration used in the source cell, and the security configuration i.e. the algorithms, if different from the ones used in the source cell, as well as parameters affecting the derivation of radio access security keys (i.e. an indication whether a new base key is to be used and a counter that is incremented upon every handover).
  • the user equipment-specific radio resource configuration i.e. the dedicated radio configuration
  • the security configuration i.e. the algorithms, if different from the ones used in the source cell, as well as parameters affecting the derivation of radio access security keys (i.e. an indication whether a new base key is to be used and a counter that is incremented upon every handover).
  • Step 7 when the source proceeds with the handover, it may start the execution phase, which may include the source eNB transparently forwarding a RRCConnectionReconfiguration message to the user equipment, that is to say it does not change the message contents.
  • the source may however perform the integrity protection and ciphering of the message.
  • the user equipment may attempt to connect to the target cell (steps 9, 10) and return the RRCConnectionReconfigurationComplete message.
  • the LTE measurement model consists of 3 main components: firstly, a measurement identity, which links a measurement reporting configuration to a measurement object; secondly a measurement object, which may specify a set of cells of a certain RAT type (e.g. all cells on an LTE frequency, a list of cells on a UMTS frequency, a list of GSM cells/ frequencies, etc.); and thirdly, a measurement report configuration, which may indicate when the user equipment should trigger a measurement report as well as which information the user equipment should include in this report.
  • a measurement report configuration may indicate that a report should be triggered in case a particular event occurs e.g.
  • event A3 a neighbour cell becomes a certain offset better than the current serving cell, or it may indicate that periodical reporting is applicable, in which case the user equipment provides at regular intervals (up to a configurable number of times) a configurable number of cells in order of measurement result i.e. best cell first.
  • Figure 4 shows an example of a conventional measurement configuration at the user equipment, which demonstrates that it is possible to link multiple report configurations to the same object, and to link one report configuration to multiple objects.
  • the signalling overhead can be minimised, e.g. by only defining a new measurement identity which links an existing measurement object to an existing report configuration, a new measurement is defined.
  • object swapping it is meant that if the frequency of the serving cell changes, i.e. the serving cell was previously part of object1 and after the handover the new serving cell is part of object2, then before taking the measurement configuration update received in the handover command into account, the user equipment autonomously re-links.
  • the user equipment may re-link all measurement identities previously referring to the old serving frequency to the new serving frequency, and all measurement identities previously referring to the new serving frequency to the old serving frequency.
  • CA carrier aggregation
  • a user equipment may be configured with multiple carriers.
  • a user equipment may be configured with intra-frequency measurements on each of these 'serving frequencies'.
  • the user equipment may be configured with inter-frequency measurements e.g. comparing a configured Component Carrier (CC)/ serving frequency with a non-configured component carrier/ neighbouring frequency.
  • CC Component Carrier
  • a user equipment may be configured to use the following configuration: frequency f1 is used as primary component carrier, while frequency f2 is used as secondary component carrier.
  • the user equipment performs intra-frequency measurements on both f1 and f2, and the user equipment performs an inter-frequency measurement on f3, i.e. comparing the serving cell on f1 with neighbouring cells on f3.
  • Embodiments of the invention may relate to carrier aggregation (CA) as follows.
  • a link to two objects may be needed to indicate both the serving frequency and the neighbouring frequency. Since there are also other ways to indicate the serving frequency, a dotted line is used in the Figure 6 that illustrates this particular configuration.
  • Figure 6 shows an example of an LTE measurement configuration with CA as an embodiment of the invention.
  • the user equipment is typically only connected to one cell, on one frequency, i.e. on one carrier. With the arrival of carrier aggregation this changes i.e. the user equipment may be connected to one Primary Component Carrier (PCC) and one or more Secondary Component Carriers (SCC's).
  • PCC Primary Component Carrier
  • SCC's Secondary Component Carriers
  • Embodiments of the invention may address the following issues: whether the primary component carrier should be changed, and if so, which node will determine which component carrier becomes the new primary component carrier; what will be done with the secondary component carrier's, i.e. should they be continued, released or replaced by other component carriers; and what will be done with the measurement configuration that is configured at the user equipment at such a CA-handover.
  • a conventional, non-carrier aggregation handover sequence has several limitations in relation to systems employing carrier aggregation.
  • any measurement report (step 2 of the handover sequence shown above) the user equipment may report only measurement results related to cells on one object/ frequency/ component carrier. This may not provide the network with information necessary for deciding how to handle other component carriers.
  • the source-eNB may decide on the target cell and may provide no further measurement information to the target eNB in steps 4 & 6 of the handover sequence shown in figure 6.
  • carrier aggregation it is conventionally not defined who/ how the target cell(s) are determined, who/how the new primary component carrier is determined, and who/how the additional secondary component carrier's are determined.
  • object swapping may be specified for source and target frequencies in single-carrier operation.
  • Embodiments of the inventions may address these indicated handover-related problems.
  • swapping may take place in configurations with multiple carriers, while some might be continued, some might be added and some might be removed upon handover.
  • measurement results obtained on additional LTE carriers may be configured to be included in a measurement report.
  • EUTRAN may configure the user equipment by means of a single on/ off indicator within the reporting configuration of a measurement whether the user equipment may include all frequencies the user equipment is currently measuring. If set, the user equipment may include for each concerned frequency the best cell as well as the available measurement result for that cell. If multiple quantities are available for the concerned cell, the user equipment may simply include them all. If the user equipment is configured to perform multiple measurements for a particular frequency, with different trigger quantities, we still preferably need to define what quantity the user equipment uses to determine which cell is best. In the first embodiment the system employs a simple on/ off control to determine whether a measurement report should contain additional frequencies.
  • the user equipment may provide measurement information for all frequencies that the user equipment is currently measuring, so as to avoid the need for the user equipment to perform additional measurements, so that there is additional reporting, but may not be additional measurements performed.
  • the additional measurement reporting may indicate the best cell(s) on each frequency that the user equipment has measured. If the user equipment performs a measurement on a frequency that does not allow the user equipment to determine the strongest cell on that frequency, the concerned frequency should, in an embodiment of the invention, not be part of the additional measurement reporting. This applies for example for measurements that only concern the serving cell, such as measurements known as an “event A1 type”.
  • Measurements that allow the user equipment to determine the strongest cell on a frequency include the following, for example: firstly, measurements of type “A3”, which may be used to determine if there are neighbouring cells on a particular frequency which measured quantity is an offset better than that of the source cell (i.e. the configured cell) on the same frequency; secondly, measurements of type event “A4”, which may be used to determine if there are neighbouring cells on a particular frequency for which the measured quantity is above a specified threshold configured for that component carrier; and thirdly, measurements of type event “A5”, which may be used to determine if both the measured quantity of the serving cell (i.e. the configured cell) on a particular frequency is below a first threshold while at the same time there is a neighbouring cell on the same frequency for which the measured quantity is above another threshold.
  • a trigger may be generated at the user equipment in dependence on a measurement result relating to a carrier frequency that is measured by the user equipment.
  • the measurement report may relate to at least to a carrier frequency other than the carrier frequency on which the trigger is based. That is to say, carrier frequencies used or potentially used for carrier aggregation may be included in the measurement report, but triggering of the report may be based on one of the carriers only in an embodiment of the invention.
  • the indicator may indicate that the measurement report is required to relate to at least a carrier frequency other than the first carrier frequency, that is to say that the indicator may indicate that measurements relating to carrier aggregation may be required.
  • the measurement report will typically comprise measurements of carrier frequencies that the user equipment is configured to measure, that is to say that typically the measurement report will make use of measurements that the user equipment is configured to measure before it received a request for a measurement report from the network.
  • the measurement report may exclude one or more carrier frequencies at which it has been determined that a best cell may not be identified, since it may be that the information on such frequencies is not useful in support of handover.
  • the exclusion may be based on whether signals are measured at least in a neighbouring cell, since if measurements are only performed on a serving cell it may not be possible to indentify a best cell. Accordingly, the measurement report may exclude one or more carrier frequencies for which signals are measured only from a serving cell.
  • the measurement report comprises measurements of all carrier frequencies that the user equipment is configured to measure, since this is a simple scheme to implement with a minimum of signalling.
  • the user equipment may determine a selected cell, such as a best cell for each carrier frequency included in said measurement report. This information may be useful in support of handover.
  • the selected cell for each carrier frequency may be determined on the basis of a measurement of a determined measurement quantity, typically received signal power or received signal quality.
  • the quantity configured at the user equipment may be used, but if more than one measurement quantity is configured at the user equipment for a respective carrier frequency, then a quantity based on received signal power may be used as a default. This may be pre-set into the user equipment.
  • Several selected cells for a carrier frequency may be determined on a basis of measurements of the determined measurement quantity, and the selected cells may be included in the measurement report in an order derived from measurements of the determined measurement quantity, for example, the best cells may be included first. This information may be useful in supporting handover.
  • the indicator may comprise an indication of carrier frequencies for which the user equipment is required to include measurements in the measurement report.
  • the indicator may include an indication of a number of selected cells to be included in the measurement report, the number of selected cells for a respective carrier frequency being the number of cells or fewer. That is to say, for example, the measurement report may be required to include up to some number of best cells per carrier frequency.
  • a measured carrier frequency is not necessarily configured for use for communication between the user equipment and the wireless access network.
  • a carrier frequency may be a candidate for future use for communication.
  • the user equipment may be configured such that said measurement report comprises measurements of a first quantity and not of a second quantity, that is to say measurements may be for example of received power, or received signal quality. This may be based on using an existing configuration of the user equipment to determine whether the measurement report comprises measurements of a first quantity or a second quantity.
  • the indicator may indicates a measurement quantity that is required by the wireless access network.
  • the user equipment may receive a message comprising an indication of a threshold and send a message including the measurement report in dependence on the measurement result exceeding the threshold.
  • the user equipment when EUTRAN configures the user equipment, by means of an indicator in a message sent to the user equipment, to perform additional measurement reporting, the user equipment provides measurement information of the best cell(s) of each frequency on which the user equipment is configured to perform a measurement allowing the user equipment to determine the strongest cell of the frequency.
  • some more enhanced control options may implemented, for example as follows.
  • an indicator may be received at the user equipment indicating the measurement configuration required at the user equipment.
  • EUTRAN may configure which of the frequencies that the user equipment is configured to measure, should be included in a measurement report, that is to say which frequencies may provide the requested additional measurement information.
  • EUTRAN may configure a number N, in which case the user equipment may, if for a frequency measured results are available for multiple cells, only provide the additional measurement information for the N best cells.
  • EUTRAN may configure a quantity, in which case the user equipment may, if multiple quantities are available, only provide the concerned quantity as part of the additional measurement information.
  • EUTRAN may configure a threshold, in which case the user equipment may only provide the additional measurement information for cells which measured result exceeds the threshold.
  • the target cell frequency and “L1” identity are typically inputs to the security key that the source eNB prepares for the target eNB. Since the source eNB selects the target cell and thus knows the identity (specifically the “L1” identity) and frequency of the target cell, this information is freely available to the source cell. In addition this information is also available to the user equipment after handover, so the user equipment can perform the same security derivation.
  • the source eNB may be aware of at least one cell that is configured after handover so that it can use the L1 identity and frequency of that cell as input for the security key derivation.
  • the user equipment should preferably also be aware of the selected cell so that it can use the same inputs for the security key derivation. It may not be preferable to use a L1 identity/frequency from a cell not configured after handover since this may enable a malicious source eNB to manipulate the key derivation for keys used in a target eNB.
  • Handover is preferably triggered by the fact that the user equipment reports a better cell than currently configured which makes the source eNB decide that a handover needs to be performed.
  • the eNB may initiate handover based on a single measurement, reflecting that a neighbouring cell becomes better than the serving cell on one of the frequencies/ component carriers configured for the user equipment, i.e. the eNB may use one frequency/ component carrier as reference for handover.
  • the eNB may configure the solutions listed in the previous discussion for problem 1, to obtain additional information regarding all frequencies/ component carriers.
  • the source eNB should be in a good position to determine a sensible primary carrier after handover, i.e. continue on the current primary component carrier or change to another one.
  • the source eNB may decide what the primary component carrier will be after handover and which cell will be used on that primary component carrier.
  • the source eNB indicates the target cell and selected primary component carrier to the target eNB as part of the handover preparation.
  • the source eNB might not have a complete overview of the resource situation and load of the potential handover target cells/ frequencies. It may not be beneficial for the source eNB to determine which carriers are to be configured as secondary component carrier's after handover.
  • the target eNB may decide which frequencies to configure as secondary component carrier after handover.
  • the source eNB may pass the measurement information obtained from the user equipment (as for example in the first to sixth embodiments described above) to the target eNB during handover preparation.
  • embodiments may employ at least two options: firstly, the source may select the target cell based on the measurement information reported by the user equipment; and secondly, the target may select the target cell, using measurement information forwarded by the source eNB.
  • the first option may imply that the source eNB only needs to provide measurement information regarding the target cell, while the second option may imply that the source eNB needs to provide measurement information of multiple cells on the concerned frequencies.
  • the latter also affects the measurement reporting by the user equipment, i.e. the user equipment may also need to report on multiple cells to accommodate the second option.
  • the second option may involve additional signalling and additional complexity, but makes it possible to take, for example, cell load into account when deciding which cell to use.
  • the first and second options may be embodied as follows.
  • the source eNB selects the target cell also on frequencies that are measured by the user equipment other than the one that is assigned the role of primary component carrier. That is to say, for frequencies that are not allocated the role of primary component carrier, the source eNB may select the target cell.
  • the source eNB preferably only provides measurement information for the target cells on each frequency to assist the target to decide which frequencies to configure as secondary component carrier.
  • the source may either forward the measured results provided by the user equipment, or provide the measurement information implicitly i.e. by means of the order of the targets (frequency, cell combinations) included in the handover preparation information e.g. best target first.
  • the source eNB may only provide measurement information, as obtained from the user equipment, for the selected target cell.
  • the target eNB may select the target cell on the frequencies that are measured by the user equipment other than the one that is assigned the role of primary component carrier, that is to say The source eNB may provide measurement information, as obtained from the user equipment, for one or more potential target cells on the concerned frequencies.
  • the eNB may provide the measurement information implicitly i.e. by ordering entries in the list of potential targets.
  • the order would involve two levels i.e. first at the level of frequencies and next at the level of cells on a frequency.
  • the source eNB may provide the measurement information implicitly i.e. by means of the order of the listed targets (frequency, cell combinations) included in the handover preparation information e.g. the best target appears first in the list.
  • first and second options may be used alongside one another i.e. the source may select cells on some frequencies while the target select cells on other frequencies e.g. the ones on which no measurement information was provided by the user equipment.
  • the primary component carrier may be the most important component carrier for mobility management. This can be seen in view of an assumption that typically only when the radio connection on the primary component carrier is lost, the user equipment will perform a re-establishment. When the same happens for other component carriers (secondary component carriers), no drastic actions may be taken because communication on the primary component carrier can still continue.
  • the intra-frequency measurements on the primary component carrier if configured, are continued immediately after the handover.
  • the user equipment and the target eNB preferably perform autonomous object swapping upon handover and re-establishment when multiple carriers are configured.
  • the UE and the target eNB upon handover and re-establishment, preferably autonomously re-link any measurement identity linked to the measurement object corresponding with the primary component carrier before handover (i.e. "old primary component carrier"), to the measurement object corresponding with the primary component carrier after handover (i.e. "new primary component carrier").
  • the UE and the target eNB upon handover and re-establishment, preferably autonomously re-link any measurement identity linked to the object corresponding with the new primary component carrier, to the measurement object corresponding with the old primary component carrier.
  • object swapping may be performed in embodiments of the invention, that is to say for inter-frequency measurements on any component carrier for which the neighbour frequency becomes serving frequency
  • object swapping is preferably performed i.e. the measurement is re-linked to the previous serving frequency.
  • the object swapping may be applied if the concerned frequencies are swapped, that is to say there was a measurement comparing a serving/ configured component carrier (‘old serving’) with a not-configured component carrier, the ‘old serving’ becomes a not configured component carrier, and the old not-configured component carrier becomes a serving/ configured component carrier.
  • ‘old serving’ serving/ configured component carrier
  • the user equipment is preferably configured to use the following configuration: frequency f1 is used as primary component carrier, while frequency f2 is used as secondary component carrier; and the user equipment performs intra-frequency measurements on both f1 and f2; and the user equipment performs an inter-frequency measurement on f3, i.e. comparing the serving on f1 with f3.
  • a handover is performed, preferably resulting in the following configuration: frequency f3 is used as primary component carrier, while frequency f2 remains configured as secondary component carrier; the user equipment performs intra-frequency measurements on both f2 and f3; and the user equipment performs an inter-frequency measurement on f1, i.e. comparing the serving on f3 with neighbours on f1.
  • object swapping may be performed as follows: the intra-frequency measurement on f1 (old primary component carrier) is re-linked to f3 (new primary component carrier), according to embodiments 3.2 and 3.3; and the inter-frequency measurements comparing the serving on f1 with neighbours on f3 is re-linked so it compares the serving on f3 with neighbours on f1.
  • Figure 7 shows Example LTE measurement configuration with CA, after object swapping.
  • EUTRAN preferably applies explicit signalling to perform any reconfigurations for these frequencies/ carriers.
  • Figure 8 provides an overview of an embodiment of a message exchange upon measurement configuration and the subsequent measurement reporting. It should be noted that this is for the purposes of illustration and other embodiments are possible, so that embodiments are not limited to the specific messages illustrated by figure 8.
  • the source eNB preferably configures the user equipment to perform measurement reporting by sending the RRCConnectionReconfiguration message including the field measConfig, at step 1.
  • Embodiments of the invention include part of an entry of the reportConfigToAddModList, as follows.
  • reportAdditionalFreqInfo this has a field indicating whether or not the user equipment may provide the additional measurement information of all frequencies the user equipment is configured to measure, as in the first or second embodiment, or a field indicate for which of the frequencies the user equipment is configured to measure, the user equipment may provide the additional measurement information, as in the third embodiment.
  • reportAdditionalMaxCells if included the user equipment may report the N best cells, with the limit N indicated by this field. If not included, the user equipment may report the best cell only.
  • reportAdditionalQuant if included and if the user equipment has measurement results available for more than one quantity, the user equipment may only report the results for the quantity indicated by this field.
  • reportAdditionalThresh if included, the user equipment may only provide additional measurement information for cells of which the measured result exceeds the threshold indicated by this field.
  • the user equipment may send a MeasurementReport message including the additional information.
  • Fields of the measurement report may include additionalMeasInfo: the user equipment may includes measurement results for a list of frequencies, with the best frequency listed first, and for each frequency, the user equipment may include measurement results for a list of one or more cells, with the best frequency listed first. For each cell, the user equipment may include either nothing (i.e. when no measurement information is needed other than the order), or the available measured results for one or more quantities.
  • Figure 9 provides an overview of the messages exchange upon handover in an embodiment of the invention. It should be noted that the messages shown are for illustrative purposes and embodiments of the invention are not limited to the use of the messages shown.
  • the source eNB preferably initiates the handover procedure, at step 1, by sending the HANDOVER REQUEST message to the target eNB.
  • the message preferably includes the HandoverPreparationInformation message, which is extended in REL-10 to support continued use of multiple component carriers for user equipments configured with CA.
  • the source eNB preferably decides which frequency to configure as primary component carrier as well as the target cell on this frequency.
  • the source eNB preferably either indicates the target cell or provides measurement information for the best cells on the frequency.
  • the measurement results are provided per frequency, with the best frequency (i.e. ranked according to the best cell on the frequency) listed first.
  • the field of the first step of figure 9 “pcc-Info” preferably indicates which frequency is used as primary component carrier as well as the target cell on this frequency. This indication may be provided by existing field e.g. the Target cell ID (ECGI) as used in EUTRAN signalling;
  • ECGI Target cell ID
  • the field “otherCC-Info” may, according to the first option as referred to above, include the target cell, that is to say it provides for a number of frequencies. Specifically, it may provide the target cell identity, and may provide measurement information for the target cell, which could be implicitly i.e. by means of the order in which the frequencies are listed i.e. best target first.
  • the field “otherCC-info” may not include the target cell. It may provide for a number of frequencies.
  • the field may provide measurement information for one or more potential target cells, which could be implicitly i.e. by means of the order in which the frequencies are listed i.e. best target first.
  • the target eNB Upon receiving the HANDOVER REQUEST message the target eNB preferably performs admission control, reserves resources in the target cell and prepares the RRCConnectionReconfiguration message.
  • the target eNB includes the RRCConnectionReconfiguration message in the HANDOVER REQUEST ACK message, which it returns to the source eNB at step 2 of figure 9.
  • the target eNB configures the frequency (and the corresponding cell) indicated by the source as primary component carrier.
  • the target eNB decides which frequencies to configure as secondary component carrier, taking into account the information provided by the source eNB.
  • the target eNB may prepare a RRCConnectionReconfiguration message accordingly and forwards this to the source eNB which forwards it to the user equipment.
  • the user equipment may initiate handover towards the indicated target cell on the primary component carrier as well as on secondary component carrier(s).
  • the user equipment may perform a reconfiguration in accordance with the fields included by the target eNB in the RRCConnectionReconfiguration message.
  • the handover is considered successful if the user equipment successfully completes the random access procedure on the primary component carrier.
  • the user equipment Upon successfully establishing the connection with the target cell the user equipment preferably sends the RRCConnectionReconfigurationComplete message.
  • Figure 10 shows a high level model of a user equipment.
  • General control may handle the layer 3 protocol i.e. receiving, processing as well as preparation and sending of Radio Resource Control (RRC) messages.
  • the measurement unit may perform the measurements that are configured by EUTRAN.
  • the security unit may perform the integrity protection for Signalling Radio Bearers (SRBs), the ciphering for all Radio Bearers (RBs) as well as the associated key derivations.
  • the radio access unit may handle the layer 1 and 2 of the radio access protocols.
  • the functional blocks may operate as follows in embodiments of the invention.
  • the general control unit may handle the reception of the new fields within the reportConfigToAddModList and may configure the Measurement unit to report additional measurement information.
  • the measurement unit may be affected in terms of information reported towards the general control unit.
  • the measurement unit may include measurement information regarding additional frequencies in a report provided to the general control unit.
  • Figure 11 shows a high level model of a eNB.
  • the user equipment control may handle the layer 3 radio access protocol i.e. receiving, processing as well as preparation and sending of Radio Resource Control (RRC) messages
  • the Network interface control may handle the similar functions for network interfaces
  • the measurement control may handle the configuration of the measurements functions in the user equipment and the eNB
  • the security control may handle the configuration of the security functions of the radio access i.e. integrity protection and the ciphering
  • the radio resource control may handle the configuration of layer 1 and 2 of the radio access protocols.
  • Embodiments of the invention may affect a number of functional blocks of an eNB as follows.
  • the user equipment control unit may handle the sending of the new fields within the reportConfigToAddModList as well as the reception of the additional measurement information within a MeasurementReport message, as well as the associated interactions with the measurement control unit and the mobility control unit.
  • the network interface control may handle the sending of the new fields within the HandoverPreparationInformation message (source side) as well as the reception of these fields (target side), as well as the associated interactions with the Mobility control unit (e.g. target side: deciding which secondary component carriers to configure) and the measurement control unit (e.g. target side: object swapping).
  • the source side may decide the primary component carrier and selects the target cell on the concerned frequency.
  • the source provides additional information regarding other component carriers (target cell, measurement information, possibly implicit).
  • the target side decides which frequencies to configure as secondary component carrier (and possibly which cells to use on these frequencies).
  • the target side also verifies the successful completion of the handover (primary component carrier is established successfully).
  • the source side may decide when to configure the user equipment to provide additional measurement information.
  • the target eNB performs the swapping of the measurement configuration.
  • Embodiments of the invention may relate to handover, as shown in the message sequence diagram of figure 9, but embodiments of the invention may also apply upon connection re-establishment.
  • the handover preparation preceding connection re-establishment is similar to that for a handover. That is to say, the information provided from source to target with respect to primary component carrier and secondary component carrier is the same.
  • the user equipment may initiate the re-establishment on any cell under the same target eNB i.e. including cells on a frequency that is not selected as primary component carrier by the source eNB. However, it may however be assumed that, like upon connection establishment, the target re-establishes radio communication on a single frequency only.
  • the concerned frequency can be regarded as a primary component carrier.
  • measurement and radio resource configurations for other component carriers are temporarily suspended, and all related configuration parts remain kept and used as basis for the delta in the first subsequent reconfiguration message. Similar measurement object swapping to that performed upon handover is also performed upon re-establishment. This also results in an updated measurement configuration for 'suspended' component carriers.
  • Embodiments of the invention may have one or more of the following advantages.
  • the option to make the user equipment include measurement information of other frequencies than the one that triggered the report introduces a general means for supporting a large variety of mobility scenario's without introducing any specifics e.g. different triggering criteria optimized for specific deployment cases.
  • the additional measurement reporting makes it possible to continue the use of multiple/ the most suitable component carriers immediately following a handover.
  • Enhanced controls can be introduced to further tune/ optimize the information provided by the user equipment e.g. indication of the frequencies, the number of cells, the reporting quantity, a minimum threshold.
  • a mechanism may be specified that preserves the existing handover and security principles.
  • the primary component carrier as the primary frequency/ cell (corresponding with a particular network node and defining the inputs used for security key derivation), that is to be decided by the source while the secondary component carrier is regarded as an additional radio resource and hence decided by the target eNB.
  • Different signaling options are covered e.g. implicitly signaling the measurement information by the order within the list.
  • embodiments of the invention may specify a mechanism covers Carrier Aggregation.
  • the main aspect is that the intra-frequency measurements on the primary component carrier are continued, i.e. these measurements are regarded as most important since the concerned frequency plays an essential role in the communication.
  • a similar object swapping may be proposed as for non-carrier aggregation systems. This is less important for maintaining the radio connection, but may help to reduce the signalling overhead.
  • the source eNB 6a may select the target cell on each frequency and decide which frequency becomes Primary Component Carrier.
  • the target eNB 6b may decide which frequencies to configure as Secondary Component Carrier.
  • the source eNB 6a may provide measurement information for multiple frequencies to the target eNB 6b, which the target eNB 6b can use this when deciding which frequencies to configure as Secondary Component Carrier.
  • the network that is to say EUTRAN, may configure the user equipment 4 to include measurement results of measured frequencies other than the one that triggered the sending of the report, that is to say additional frequency results.
  • the user equipment 4 and target eNB 6b may change the measurement configuration with respect to the linking of measurement objects, to facilitate continuation of measurements on the frequency assigned as primary component carrier with minimal signalling i.e. the user equipment may swap the objects of the previous and new primary component carrier, while the linking of other objects is unchanged (i.e. EUTRAN uses explicit signalling).
  • EUTRAN uses explicit signalling.

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Abstract

Un transfert intercellulaire avec agrégation de porteuses est fourni. Un procédé permettant d'assister un transfert intercellulaire d'un équipement utilisateur depuis un nœud d'accès sans fil source jusqu'à un nœud d'accès sans fil cible, destiné à un réseau d'accès sans fil ayant une pluralité de fréquences porteuses et une pluralité de cellules dans lequel une cellule et une fréquence porteuse peuvent être configurées sous la forme d'une porteuse de composantes, et dans lequel au moins deux porteuses de composantes peuvent être agrégées pour une communication entre l'équipement utilisateur et le nœud d'accès sans fil source, les porteuses de composantes agrégées comprenant une porteuse de composantes primaire et au moins une porteuse de composantes secondaire inclut les étapes suivantes consistant à sélectionner, au niveau du nœud d'accès sans fil source, une première fréquence porteuse qui doit être configurée comme une porteuse de composantes primaire pour une communication avec le nœud d'accès sans fil cible après un transfert intercellulaire, et sélectionner, au niveau du nœud d'accès sans fil cible, un deuxième fréquence porteuse qui doit être configurée comme une porteuse de composantes secondaire pour une communication avec le nœud d'accès sans fil cible après un transfert intercellulaire.
PCT/KR2011/003115 2010-04-12 2011-04-27 Transfert intercellulaire avec agrégation de porteuses WO2011142544A2 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP11780761.0A EP2569979A4 (fr) 2010-05-11 2011-04-27 Transfert intercellulaire avec agrégation de porteuses
RU2012147810/07A RU2576385C2 (ru) 2010-05-11 2011-04-27 Хэндовер с агрегацией несущих
CA2798930A CA2798930C (fr) 2010-05-11 2011-04-27 Transfert intercellulaire avec agregation de porteuses
CN201180023648.5A CN102948214B (zh) 2010-05-11 2011-04-27 利用载波聚合的切换
JP2013510015A JP2013526794A (ja) 2010-05-11 2011-04-27 キャリア結合を有するハンドオーバー
AU2011251152A AU2011251152B2 (en) 2010-05-11 2011-04-27 Handover with carrier aggregation
US13/696,475 US9661533B2 (en) 2010-04-12 2011-04-27 Handover with carrier aggregation
KR1020127029577A KR101783289B1 (ko) 2010-05-11 2011-04-27 캐리어 결합을 가지는 핸드오버

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GB1007869.9A GB2479601B (en) 2010-04-12 2010-05-11 Handover with carrier aggregation
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RU2012147810A (ru) 2014-05-20
KR20130094707A (ko) 2013-08-26
AU2011251152B2 (en) 2015-09-17
CA2798930A1 (fr) 2011-11-17
JP2013526794A (ja) 2013-06-24
RU2576385C2 (ru) 2016-03-10
EP2569979A2 (fr) 2013-03-20
WO2011142544A3 (fr) 2012-03-01
CN102948214A (zh) 2013-02-27
EP2569979A4 (fr) 2017-09-13
KR101783289B1 (ko) 2017-09-29
CN102948214B (zh) 2016-11-23
AU2011251152A1 (en) 2012-11-29

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