WO2016130062A1 - Préparation précode de transfert dans un réseau de communication sans fil - Google Patents

Préparation précode de transfert dans un réseau de communication sans fil Download PDF

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Publication number
WO2016130062A1
WO2016130062A1 PCT/SE2015/050174 SE2015050174W WO2016130062A1 WO 2016130062 A1 WO2016130062 A1 WO 2016130062A1 SE 2015050174 W SE2015050174 W SE 2015050174W WO 2016130062 A1 WO2016130062 A1 WO 2016130062A1
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WO
WIPO (PCT)
Prior art keywords
network node
radio network
handover
source
wireless device
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PCT/SE2015/050174
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English (en)
Inventor
Parisa PAKNIAT
Håkan AXELSSON
Diana Andrei
Stefan Johansson
Bo Ehrenholm
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Telefonaktiebolaget Lm Ericsson (Publ)
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Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2015/050174 priority Critical patent/WO2016130062A1/fr
Publication of WO2016130062A1 publication Critical patent/WO2016130062A1/fr

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Classifications

    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. 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
    • H04W36/0055—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

Definitions

  • communication network e.g. telecommunication network, for managing handover of a wireless device from a source cell to a target cell.
  • Communication devices such as wireless devices may also be known as e.g. user equipments (UEs), mobile terminals, wireless terminals and/or mobile stations.
  • a wireless device is enabled to communicate wirelessly in a cellular communication network, wireless communication system, or radio communication system, sometimes also referred to as a cellular radio system, cellular network or cellular communication system.
  • the communication may be performed e.g. between two wireless devices, between a wireless device and a regular telephone and/or between a wireless device and a server via a Radio Access Network (RAN) and possibly one or more core networks, comprised within the cellular communication network.
  • the wireless device may further be referred to as a mobile telephone, cellular telephone, laptop, Personal Digital Assistant (PDA), tablet computer, just to mention some further examples.
  • the wireless device may be, for example, portable, pocket-storable, hand-held, computer-comprised, or vehicle-mounted mobile device, enabled to communicate voice and/or data, via the RAN, with another entity, such as another wireless device or a server.
  • the cellular communication network covers a geographical area which is divided into cell areas, wherein each cell area is served by at least one base station, or Base Station (BS), e.g. a Radio Base Station (RBS), which sometimes may be referred to as e.g. "eNB”, “eNodeB”, “NodeB”, “B node”, or BTS (Base Transceiver Station), depending on the technology and terminology used.
  • BS Base Station
  • RBS Radio Base Station
  • eNB Radio Base Station
  • eNodeB eNodeB
  • NodeB Node
  • BTS Base Transceiver Station
  • the base stations may be of different classes such as e.g. macro eNodeB, home eNodeB or pico base station, based on transmission power and thereby also cell size.
  • a cell is the geographical area where radio coverage is provided by the base station at a base station site. Cells may overlap so that several cells cover the same geographical area.
  • the base station providing or serving a cell By the base station providing or serving a cell is meant that the base station provides radio coverage such that one or more wireless devices located in the geographical area where the radio coverage is provided may be served by the base station.
  • a wireless device When a wireless device is said to be served in or by a cell this implies that the wireless device is served by the base station providing radio coverage for the cell.
  • One base station may serve one or several cells. Further, each base station may support one or several communication technologies. The base stations communicate over the air interface operating on radio frequencies with the wireless device within range of the base stations.
  • GSM Global System for Mobile Communication
  • base stations which may be referred to as eNodeBs or eNBs, may be directly connected to other base stations and may be directly connected to one or more core networks.
  • 3GPP 3rd Generation Partnership Project
  • eNodeBs Long Term Evolution
  • eNBs may be directly connected to other base stations and may be directly connected to one or more core networks.
  • UMTS is a third generation mobile communication system, which may be referred to as 3rd generation or 3G, and which evolved from the GSM, and provides improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) access technology.
  • UMTS Terrestrial Radio Access Network (UTRAN) is essentially a radio access network using wideband code division multiple access for wireless devices.
  • High Speed Packet Access (HSPA) is an amalgamation of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), defined by 3GPP, that extends and improves the performance of existing 3rd generation mobile telecommunication networks utilizing the WCDMA.
  • HSPA High Speed Packet Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • Such networks may be named WCDMA/HSPA.
  • the 3GPP has undertaken to evolve further the UTRAN and GSM based radio access network technologies, for example into evolved UTRAN (E-UTRAN) used in LTE.
  • E-UTRAN evolved UTRAN
  • the expression downlink (DL) is used for the transmission path from the base station to the wireless device.
  • the expression uplink (UL) is used for the transmission path in the opposite direction i.e. from the wireless device to the base station.
  • Handover refers to the action of handing over a wireless device being served in a serving cell to another, target cell to instead being served in there, e.g. in order to enable seamless service provision during mobility, i.e. when the wireless device moves.
  • the handover involves one or more radio network nodes, e.g. a serving base station and a target base station, and/or controlling nodes thereof.
  • radio network nodes e.g. a serving base station and a target base station
  • handover between cells served by different base stations there are at least two radio network nodes involved.
  • handover of the wireless device typically involve a serving base station serving the serving cell, and a target base station serving the target cell.
  • a handover is triggered by a UE measurement indicating either, that a) the source cell serving the UE is worse than a threshold, or b) a target cell, i.e. potential new serving cell, is x dB better than source cell, where x corresponds to a threshold value.
  • case a) is typically covered by a so called A2 event, and case b) by a so called A3 event.
  • Case a) typically handles Inter Radio Access Technology (IRAT) and inter-frequency handovers
  • case b) typically handles intra-frequency handovers.
  • IRAT refer to handover to a target cell of a different RAT than the source cell.
  • Figure 1 shows an example of a signalling flow regarding handover in LTE where the signalling takes part between a source eNB, i.e. currently serving eNB, and a target eNB over the so called X2 interface. More detailed information may be found in e.g. 3GPP TS 36.423 "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • source eNB refers to the eNB providing the source cell
  • target eNB refers to the eNB providing the target cell.
  • the source eNB triggers handover execution in the UE by sending a so called L3 RRC message to the UE ordering it to execute the handover to the target cell, see e.g. action 6.
  • the source cell itself starts to deliver buffered and in transit packets, i.e. performs packet forwarding, to the target cell that buffers these packets, see e.g. action 7.
  • the UE has tuned to the target cell it performs a random access and some L3 signaling in order to inform the target eNB that it has successfully executed the handover, see e.g. action 8.
  • the target eNB then informs the source cell to release the UE context from the source cell, and the source eNB releases resources, see e.g. actions 9-10. After this the handover is considered complete and successfully executed.
  • An object is to provide improvements a wireless communication network with regard to handover.
  • the object is achieved by a method, performed by a source radio network node, for preparing handover of a wireless device from a source cell to a target cell.
  • a source radio network node for preparing handover of a wireless device from a source cell to a target cell.
  • At least the source cell is provided by the source radio network node.
  • Said source radio network node and source cell are being comprised in a first wireless communication network.
  • Said target cell is also comprised in said first wireless communication network or in another, second wireless communication network.
  • the source radio network node identifies a triggering situation for early handover preparation.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the source radio network node performs actions of said early handover preparation, which actions start to be performed in response to the identification of the triggering situation.
  • the object is achieved by a computer program comprising instructions that when executed by a processing circuit causes the source radio network node to perform the method according to the first aspect.
  • the object is achieved by a data carrier comprising the computer program according to the second aspect.
  • the object is achieved by a method, performed by a target radio network node, for preparing handover of a wireless device from a source cell to a target cell.
  • At least the target cell is provided by the target radio network node.
  • the source cell is comprised in a first wireless communication network.
  • the target radio network node and said target cell are also comprised in said first wireless communication network, or in another, second wireless communication network.
  • the target radio network node obtains information that early handover preparation is ongoing.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the target radio network node performs actions of early handover preparation, which actions start to be performed in response to that the information has been obtained.
  • the object is achieved by a computer program comprising instructions that when executed by a processing circuit causes the target radio network node to perform the method according to the fourth aspect.
  • the object is achieved by a data carrier comprising the computer program according to the fifth aspect.
  • the object is achieved by a method, performed by a wireless device, for managing handover of the wireless device from a source cell to a target cell.
  • a wireless device for managing handover of the wireless device from a source cell to a target cell.
  • At least the source cell is provided by a source radio network node.
  • Said source radio network node and source cell are being comprised in a first wireless communication network.
  • Said target cell is also comprised in said first wireless communication network or in another, second wireless communication network.
  • the wireless device receives, from the source radio network node, information
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the object is achieved by a computer program comprising instructions that when executed by a processing circuit causes the wireless device to perform the method according to the seventh aspect.
  • the object is achieved by a data carrier comprising the computer program according to the eight aspect.
  • the object is achieved by a source radio network node for preparing handover of a wireless device from a source cell to a target cell.
  • the source radio network node is configured to be comprised in a in a first wireless communication network and to provide the source cell.
  • the target cell is comprised in said first wireless communication network or in another, second wireless communication network.
  • the source radio network node is configured to identify a triggering situation for early handover preparation.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the source radio network node is further configured to perform actions of said early handover preparation, where the actions start to be performed in response to the identification of the triggering situation.
  • the object is achieved by a target radio network node for preparing handover of a wireless device from a source cell to a target cell.
  • At least the target cell is provided by the target radio network node.
  • Said source cell is comprised in a first wireless communication network.
  • Said target cell is also comprised in said first wireless communication network or in another, second wireless communication network.
  • the target radio network node is configured to be comprised in the first wireless communication network and/or in the second wireless communication network.
  • the target radio network node is further configured to obtain information that early handover preparation is ongoing.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the target radio network node is configured to perform actions of early handover preparation, which actions start to be performed in response to that the information has been obtained.
  • the object is achieved by a wireless device for managing handover of the wireless device from a source cell to a target cell.
  • At least the source cell is provided by a source radio network node.
  • the source radio network node and the source cell are comprised in a first wireless communication network.
  • Said target cell is also comprised in said first wireless communication network or in another, second wireless communication network.
  • the wireless device is configured to receive, from the source radio network node, information commanding the wireless device to start executing handover to the target cell when certain one or more criteria are fulfilled. Said criteria being specific for performing handover in response to early handover preparation by the source radio network node.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device from the source cell to the target cell.
  • the early handover preparation above reduces the time needed if/when an actual handover at some later point is to be carried out.
  • the preparation is then already done. It also enables an extended time period for performing actions during handover, which in turn enable that actions relating to handover can be spread in time, such as actions resulting from when a large amount of wireless devices request handover at the same or almost the same time. Without spreading such actions in time it may happen that a large amount of wireless devices are using, or at least attempt, to access and/or use the same limited resource(s) at the same time, which may result in handover failures.
  • embodiments herein improve handover.
  • Figure 1 is a combined signaling diagram and flowchart showing an example regarding existing handover in LTE.
  • Figure 2 is a block diagram schematically depicting an example of a wireless communication network in which embodiments herein may be implemented.
  • Figure 3 is a combined signaling diagram and flowchart for describing embodiments herein.
  • Figure 4 is a flowchart schematically illustrating actions related to embodiments herein.
  • Figure 5 is an schematic illustration for exemplifying some embodiments herein.
  • Figure 6 is a flowchart schematically illustrating embodiments of a method performed in a source radio network node.
  • Figure 7 is a functional block diagram for illustrating embodiments of the source radio network node.
  • Figure 8 is a flowchart schematically illustrating embodiments of a method performed in a target radio network node.
  • Figure 9 is a functional block diagram for illustrating embodiments of the target radio network node.
  • Figure 10 is a flowchart schematically illustrating embodiments of a method performed in a wireless device.
  • Figure 11 is a functional block diagram for illustrating embodiments of the wireless device.
  • Figures 12a-c are schematic drawings illustrating embodiments relating to computer program products and computer programs to cause the source radio network node, the wireless device and the target radio network node to perform method actions.
  • Case a) means the UE is travelling with a high speed which means the handover execution time is critical in order to have a successful handover and thus not drop the connection at cell borders.
  • Case b) means a large amount of UEs will need to perform handovers very close in time. This means common scarce resources need to be utilized very close in time. Such common resources may be CPU cycles and memory space in network nodes, transmission bandwidth and L3 signalling capacity, i.e. air interface capacity.
  • KPIs Key Performance Indicators
  • FIG. 2 depicts an example of a first wireless communication network 100, e.g. a telecommunication network.
  • the first wireless communication network 100 comprises a source cell 115.
  • the source cell 1 15, or at least radio coverage thereof, is provided by a 5 source radio network node 110 comprised in the wireless communication network 100, or more particularly in a Radio Access Network (RAN) part thereof.
  • RAN Radio Access Network
  • the first wireless communication network 100 may also comprise a target cell 116.
  • the target cell 116 may be comprised in a second wireless communication network 101 , e.g. a telecommunication network.
  • the 10 network 101 may differ in that it is operated by another operator than the first wireless communication network 100 and/or is a wireless communication network according to another Radio Access Technology (RAT) than the first wireless communication network 100.
  • RAT Radio Access Technology
  • the first wireless communication network 100 and/or the second wireless communication network 101 may be LTE or LTE based network, but may
  • 15 alternatively be any cellular network or system, such as a, or based on a, UMTS,
  • the target cell 1 16, or at least radio coverage thereof, may be provided by a target radio network node 111 comprised in the first wireless communication network 100 or the second wireless communication network 101 , or more particularly in a RAN part of any of these
  • the source radio network node 1 10 is shown in a situation when it is serving wireless devices 120-1..120-N in a source cell 115.
  • the reference numerals 120-1..120- N are intended to identify a total number of N wireless devices, where N is an integer value greater than or equal to 2. As should be recognized, each of the wireless devices
  • the wireless device 120-1 that will mainly be used in examples herein, is a device capable to wirelessly communicate in the wireless communication network 100, and possibly also the second wireless communication network 101 , over one or more radio links, via network nodes of the first wireless communication network 100 and/or the second wireless communication network 101 , and with e.g. other communication devices
  • the wireless device 120-1 may e.g. correspond to a user equipment, a mobile station, a mobile terminal or a wireless terminal, a mobile phone, a computer such as e.g. a laptop, a Personal Digital Assistants (PDAs) or a tablet computer, sometimes referred to as a surf plate, with wireless capability, a so called Machine to Machine (M2M) device or Machine Type of Communication (MTC)
  • M2M Machine to Machine
  • MTC Machine Type of Communication
  • 35 device i.e. devices that are not associated with a conventional user, or any other radio network unit capable to wirelessly communicate over a radio link in at least the wireless communication network 100.
  • the source radio network node 110 may, as illustrated in the figure, be a base station, e.g. an eNB in LTE, or any other radio network node capable of serving a wireless device, such as the wireless device 120-1 , in the wireless communication network 100.
  • the target radio node 1 11 may, as illustrated in the figure, be a base station, e.g. an eNB in LTE, or any other radio network node capable of serving a wireless device, such as the wireless device 120-1 , in the first wireless communication network 100 or the second wireless communication network 101.
  • the source radio network node 1 10 is typically a physically different radio network node than the target radio network node 1 11.
  • the wireless devices 120-1..120-N are shown with dashed arrows to the target radio network node 11 1 to illustrate that they are candidates, i.e. may possibly, be subject for handover to the target cell 116 although they may not be in a situation where actual handover to the target cell 1 16 would be triggered. Actual handover to the target cell 1 16 may thus occur later for one or more of the wireless devices 120-1..120-N, although this is not necessary for embodiments herein.
  • One or more, or all, of the wireless devices 120- 1..120-N may be stationary, and/or others be moving, e.g. to the right in the figure, towards the target cell 1 16. The figure exemplifies a situation where it later may occur an actual handover of some or all of the wireless the wireless devices 120-1..120-N from the source radio network node 110 to the target radio network node 1 11.
  • the source radio network node 110 and/or target radio network mode 11 1 comprised therein are eNBs.
  • the source radio network node 110 and/or target radio network mode 1 11 comprised therein may be RNCs.
  • the source radio network node 1 10 and/or target radio network mode 1 11 comprised therein are typically BSCs.
  • the source radio network node 1 10 and the target radio network node 11 1 may be communicatively connected to each other directly or via one or more further network nodes 130.
  • the one or more further network nodes 130 may be comprised in the first wireless communication network 100 and/or the second wireless communication network 101 , typically in core network parts thereof, although also RAN parts may be involved.
  • the one or more further network nodes 130 may comprise one or more nodes for controlling and/or managing the source radio network node 1 10 and/or the target radio network node 11 1.
  • the one or more further network nodes 130 may be or comprise a MME.
  • the one or more further network nodes 130 may comprise MSCs and/or SGSNs.
  • the target cell 1 16 may be fully comprised in the source cell 1 15 or vice versa, or the cells may overlap more or less and differently than shown in the figure.
  • a wireless communication network that in reality corresponds to the wireless communication network 100 typically comprises several further network nodes, base stations, cells etc., as realized by the skilled person, but which are not shown herein for the sake of simplifying.
  • Figure 3 depicts a combined signaling diagram and flowchart and will be used to discuss examples of embodiments of a method, and related examples, regarding handover with early handover preparations of a wireless device, e.g. the wireless device 120-1 , from the source cell 1 15 to the target cell 116.
  • a wireless device e.g. the wireless device 120-1
  • the target cell 1 16 may have been selected based on one or more of the following: a probability for actual handover to the target cell 116,
  • the target cell 116 may also be selected based on measurements made by the wireless device 120-1.
  • the selection of the target cell 1 16 may be made among all cells of the first wireless communication network 100 and/or the second wireless communication network 101 , or at least such cell or cells thereof that have some probability to be subject for an actual handover.
  • the source radio network node 1 10 may itself fully or partly have selected the target cell 116.
  • the source radio network node 110 may internally have obtained at least part of the information that the selection is based upon and/or received at least part of the information that the selection is based upon from the first wireless communication network 100, i.e. from one or more network nodes thereof, e.g. a management node and/or an Operations & Maintenance (O&M) node that may be operated by an operator of the first wireless communication network 100.
  • O&M Operations & Maintenance
  • One or more criteria for making the selection may be predetermined and/or predefined, and/or may at least partly have been received from the first wireless communication network 100, i.e. from one or more network nodes thereof, e.g. a management node and/or a O&M node that may be operated by an operator of the first wireless communication network 100.
  • the actual selection of the target cell may have been performed by another suitable network node in the first wireless communication network 100, such as a management node, which then, in response to the selection, has informed the source radio network node 110 about the target cell 1 16.
  • a management node another suitable network node in the first wireless communication network 100, such as a management node, which then, in response to the selection, has informed the source radio network node 110 about the target cell 1 16.
  • the method comprises the following actions, which actions may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.
  • Action 301
  • the wireless device 120-1 may send one or more measurement reports to the serving source radio network node 110 that receives the reports.
  • the reports may comprise and/or correspond to such measurement reports that conventional handover is based on and may e.g. correspond to the measurements reports in action 1 of Figure 1 , discussed in the Background.
  • the source radio network node 1 10 identifies a triggering situation for early handover preparation of the wireless device 120-1 from the source cell 115 to the target cell 1 16.
  • early handover preparation refers to handover preparation before any actual decision to perform handover, in this action of the wireless device 120- 1 , from the source cell 1 15 to the target cell 116.
  • early handover preparation can be described as handover preparation in advance compared to when actual handover and related handover preparation should or would be triggered.
  • triggering of and thus start of early handover preparations means that handover may be started even in the absence of measurements for triggering conventional handover.
  • the triggering situation may be based on one or more of the following:
  • one or more measurement reports received from the wireless device 120-1 regarding the target cell 116 which measurement reports are insufficient for triggering actual handover, but that may still be sufficient and/or suitable for starting early handover preparations.
  • the identification of the triggering situation may thus be based on the one or more measurement reports received in Action 301.
  • the triggering situation may additionally or alternatively be based on events and/or properties associated with the wireless device 120-1 , e.g. an increased probability for actual handover based on speed of the wireless device 120-1.
  • the triggering situation may be predetermined and/or predefined and thereby known to the source radio network node 110.
  • the source radio network node 1 10 may have been informed about the triggering situation by the first wireless communication network 100, i.e. by one or more suitable network nodes therein.
  • the source radio network node 1 10 performs actions of said early handover preparation, which actions start, i.e. begin, to be performed in response to the
  • Said actions of early handover preparation may comprise and/or correspond to actions of conventional handover preparation, but performed differently in time since the actions of early handover preparation are performed before any actual decision to perform handover. Said actions of early handover preparation may thus correspond to action 2,3,5 of Figure 1 , discussed in the Background, but here performed differently in time.
  • Advantageously may all or part of said actions of early handover preparation and corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices, e.g. the wireless devices 120-2..120-N, be performed spread out in time in relation to each other.
  • This may thus solve problems related to case b) that was discussed above, related to when a large amount of wireless devices at some point else would have to perform handover preparations about the same time, possibly in combination with case a) where handover also have to be accomplished fast due to fast moving wireless devices. This situation may e.g. occur when wireless devices are located and used on a train.
  • one or more requests may be sent to the target radio network node 11 1 when executing the present action, which requests are requesting the target radio network node 11 1 to perform handover preparation, e.g. by sending handover request command spread in time to the target radio network node.
  • the actions may also involve requesting the target radio network node to perform actions of handover preparation spread in time, e.g. by sending a command commanding this.
  • the actions of early handover preparation being performed by the source radio network node 1 10 typically comprise sending information to the target radio network node 11 1 providing the target cell 1 16, which information identifies that early handover preparation is ongoing.
  • This enables the target radio network node 11 1 to perform differently compared to in case of conventional handover, which e.g. may involve to expect handover to be performed during a longer time period than conventionally, which reduces the risk of failed handover in repose to the early handover preparation.
  • the information may be sent in association with, e.g. as part of, requesting the target radio network node 11 1 to perform handover preparations in response to receiving the information.
  • the information may, as already mentioned above, also request the target radio network node 11 1 to perform actions of the handover preparations so they will be spread in time in relation to corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices, e.g. the wireless devices 120-2..120-N, that are served in the source cell 1 15.
  • the target radio network node 11 1 may, as already mentioned above, also request the target radio network node 11 1 to perform actions of the handover preparations so they will be spread in time in relation to corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices, e.g. the wireless devices 120-2..120-N, that are served in the source cell 1 15.
  • Said information sent from the source radio network node 1 10 to the target radio network node11 1 may be accomplished by a new indication in existing handover signaling, e.g. in case of LTE in a S1AP HANDOVER REQUIRED or X2AP HANDOVER REQUEST message.
  • This thus signals to the target radio network node 11 1 that the source radio network node 1 10 supports embodiments herein and e.g. early handover preparations.
  • the target radio network node 11 1 may in turn inform the source radio network node 110 it supports embodiments herein and e.g. early handover preparations.
  • This may be in response to said information sent from the source radio network node 1 10 to the target radio network node 11 1 and may also be accomplished by a new indication in existing handover signaling, e.g. in case of LTE in a S1AP HANDOVER REQUEST ACK->S1AP
  • HANDOVER COMMAND message or in a X2AP HANDOVER REQUEST ACK message This thus signals to the source radio network node 1 10 that the target radio network node 1 11 also supports embodiments herein and e.g. early handover preparations and has chosen to apply this.
  • Said new indications are transparent to a MME when such is involved, as is the case for the S1 AP signaling.
  • the source radio network node may, from the target radio network node 11 1 , receive information for commanding the wireless device 120-1 to start executing handover to the target cell 116 when certain one or more criteria are fulfilled. This information may then be used by the source radio network node to command the wireless device 120-1 , which is further described below under Action 306.
  • the target radio network node 1 11 obtains information that early handover preparation is ongoing. This typically comprise that the target radio network node receives said information from the source radio network node 110, i.e. as discussed above under Action 303.
  • the target radio network node 1 11 performs actions of early handover preparation, which actions start to be performed in response to that the information was obtained in Action 304.
  • all or part of said actions of early handover preparation and corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices are performed spread out in time in relation to each other. This behavior may be
  • the target radio network node 11 1 may perform said spread in time of the actions of simultaneously ongoing early handover preparations based on information received from the source radio network node 110 when it performs actions of early handover preparation, such as discussed above under Action 303. This information may be the same as, or be received together with, the information from the source radio network node as discussed above under Action 304.
  • the present action i.e. the target radio network node 11 1 performing said actions of 5 early handover preparation, may further comprise that the target radio network node 11 1 sends, to the source radio network node 1 10 that receives, information for commanding the wireless device 120-1 to start executing handover to the target cell 116 when certain one or more criteria are fulfilled.
  • the criteria being specific for performing handover in response to said early handover preparation.
  • the source radio network node 110 may receive this information as part of its early handover preparations in Action 303 and then use it to command the wireless device 120- a by sending the information regarding said criteria to the wireless device 120-1 , which is further described below under Action 306.
  • the source radio network node 110 sends, to the wireless device 120-1 in response to Action 304, i.e. in response to the performed actions of its early handover preparation, information commanding the wireless device 120-1 to start executing handover to the target cell 116 when certain one or more criteria are fulfilled.
  • the criteria being specific for
  • the wireless device 120-1 receives the information.
  • the wireless device 120-1 would start executing handover directly in response to information from the source radio network node 1 10 informing that handover preparation have been performed.
  • the present action makes sure that although handover
  • handover should not be performed directly but e.g. when said certain one or more criteria have been fulfilled.
  • the one or more criteria may be chosen so that handover will be executed at similar radio conditions as conventionally, i.e. when actual handover and preparations thereof would be triggered.
  • the information in this action may be sent from the target radio node 1 11 to, and
  • the source radio network node 110 as part of both node's early handover preparations, as e.g. as illustrated by the arrow from Action 305 o Action 303 in Figure 3, and as commented under Action 305 above.
  • conventional information may be sent to the wireless
  • the certain one or more criteria may be predetermined and/or predefined. They may be fully or partly already known by the wireless device 120-1 and/or may be fully or partly sent to the wireless device by the source radio network node 110, e.g. in association with, such as comprised in, said information that in the present action commands the wireless device 120-1 to start executing handover.
  • Said one or more criteria may be based on one or more thresholds regarding measurements by the wireless device 120-1 on the source cell 115 and/or the target cell 1 16, and/or on expiration of a timer.
  • each wireless device 120-1..120-N may be associated with a different timer so that not all the wireless devices 120-1..120-N will start handover at virtually the same time even though radio conditions would allow it.
  • the timer may thus corresponds to a delay before handover is started to be executed.
  • the timer, and thus the corresponding delay may be set, e.g. randomized, within certain limits so as not to allow an unsuitable long delay.
  • the information commanding the wireless device 120-1 to start executing handover to the target cell 116 when certain one or more criteria are fulfilled may comprise a list of target cells in a priority order, which list comprises the target cell 116 that e.g. may be the target cell with a highest priority in the list.
  • the wireless device 120-1 performs actions of handover execution in response to that said one or more criteria, received under Action 306, are fulfilled.
  • the wireless device 120-1 may perform measurements in order to determine when the one or more criteria discussed above under Action 306 are fulfilled.
  • measurements being based on the one or more criteria and what need be measured and/or checked to be able to determine when the one or more criteria are fulfilled.
  • the actions of handover execution may as such be conventional ones and may be performed conventionally, see e.g. action 8 in Figure 1.
  • the wireless device 120-1 Before the wireless device 120-1 starts to perform the actions of handover execution after said one or more criteria are fulfilled, it may apply a first random delay, which is further commented below.
  • the wireless device- 120-1 will at some point tune to the target cell 1 16 and perform a random access in the target cell 116, which may be done in a conventional manner, however, the wireless device 120-1 may here apply a second random delay before performing the random access in the target cell 1 16.
  • the source radio network node 1 10 detects when the wireless device 120-1 , in Action 307, starts to execute handover to the target cell 1 16.
  • the source radio network node 110 This enables for the source radio network node 110 to detect when the wireless device 120-1 leaves the source cell 115 and thereby enables the source radio network node 110 to stop scheduling the wireless device 120-1 in the source cell 115 for DL and UL. It also enables the source radio network node 1 10 to start packet forwarding of packets to the target cell when this is suitable, as is discussed below under Action 309.
  • One or more of the following mechanisms may be used to detect that the wireless device 120-1 has left the source cell 1 15 after the source radio network node 110, in Action 306, sent the information commanding the wireless device 120-1 to start executing handover to the target cell 1 16 (i.e. when said certain one or more criteria are fulfilled):
  • Radio Link Control (RLC) transmitting entity, comprised in the wireless communication network 100, have made with regard to status reports from the wireless device 120-1.
  • RLC Radio Link Control
  • a further option for detecting when the wireless deice 120-1 has left the source cell 115-1 is to perform bi-casting, which means transmitting data in both the source cell 115 and the target cell 116 until the wireless device 120-1 is detected in the target cell 116.
  • the source radio network node 1 10 performs packet forwarding to the target radio network node 1 11.
  • the packet forwarding being started in response to detection, such as in Action 308, that the wireless device 120-1 has started executing handover to the target cell 116, and thereby has leaved the source cell 1 15
  • the packet forwarding may correspond to such packet forwarding that is performed during conventional handover, see e.g. action 7 in Figure 1 , but with the exception that it is here based on the detection that the wireless device has started an execution phase of the handover, leaving the source cell. Without this, the packet forwarding would occur before said one or more criteria are fulfilled, if they ever are, and/or the packet forwarding may occur when the wireless device 120-1 still is and shall be served in the source cell 1 15.
  • the target radio network node In response to that the wireless device 120-1 performs the actions of handover execution in Action 307, the target radio network node also performs actions of handover execution. Except for that said one or more criteria, as discussed above under Action 306, affect when the actions of the handover execution are to be executed in the wireless device 120-1 and thereby also may affect when the actions of the handover execution are to be executed in target radio network node 11 1 , the actions of handover execution in the target radio network node 1 11 may comprise conventional actions that may be performed conventionally. See e.g. the situation in Figure 1 , ending with action 9 and context release being sent to the source eNB.
  • the source radio network node 1 10 detects that handover is complete and releases resources. This is typically in response to that the target radio network node 1 1 1 has sent information identifying that this is the case, e.g. sent a conventional context release signal as shown in Figure 1 , action 9.
  • the present action may correspond to action 10 in Figure 1.
  • the one or more criteria discussed above under e.g. Action 304 i.e. the criteria to be fulfilled in order for the wireless device 120-1 to start executing handover to the target cell 116, will now be further discussed and exemplified in some detail.
  • the handover may be considered to have been ordered but not to be executed by the wireless device 120-1 until said, i.e. certain, one or more criteria are fulfilled.
  • the one or more criteria may be based on a) how measurements on the target cell 116 relate to a target cell threshold, and/or b) how measurements on the source cell 1 15 relate to a source cell threshold. Additionally or alternatively the one or more criteria may be based on c) expiration of a timer.
  • the one or more criteria may be based on one or more of the following:
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the one or more criteria may thus be a combination of one or more of the above.
  • the first and second bullet in the list above are similar to existing so called
  • the one or more criteria are used by the wireless device 120-1 to determine when it shall start execute the handover to the target cell 1 16, and there is thus no need to signal to the first wireless communication network 100, or the second wireless communication network 101 , that any of the one or more criteria is fulfilled.
  • FIG. 4 is a flowchart schematically illustrating actions according to embodiments herein. The actions are described in detail below.
  • the first wireless communication network 100 determines, or decides, what trigger situation there shall be, i.e. for initiating early handover preparation. Based on the trigger situation one or more target cell, i.e. one or more cells of many possible in the first communication network 100 or the second communication network 101 , are selected. The selected one or more target cells comprise or correspond to the target cell 116. Selection of the one or more target cells is further discussed separately below.
  • the first wireless communication network 100 determining, or deciding, the trigger situation may comprise that one or more network nodes thereof, with or without input from e.g. an operator, are involved.
  • Action 402 When the trigger situation from action 201 occurs, the source radio network node 1 10 starts handover preparations that will be earlier than handover preparations performed according to conventional handover, as discussed above.
  • the source radio network node 1 10 performs handover preparations to the one or more target cells selected in action 401 , thus involving at least the target cell 116.
  • the handover preparations for different handovers e.g. with regard to multiple target cells and/or multiple wireless devices, are spread out in time within the source radio network node 110 and the involved one or more target radio network nodes including at least the radio network node 1 11. The spread in time may be done in order to balance signaling load between the source radio network node 1 10 and the involved one or more target radio network nodes.
  • the source radio network node 1 10 may control pace and/or execution of the early handover preparations and the spread in time.
  • the source radio network node 1 10 may inform, e.g. instruct, the involved one or more target radio network nodes, i.e. including the target radio network node 1 11 , to execute the early handover preparations by using e.g. a new indication in existing handover signaling.
  • Action 402 may fully or partly correspond to Actions 302-305 above.
  • Action 403 When the early handover preparations in action 402 have been performed, assumed successfully, for a wireless device, e.g. the wireless device 120-1 , the source radio network node 110 orders handover execution to the wireless device 120- 1 but with the addition of the one or more criteria to be fulfilled, e.g. one or more measurement criteria and/or one or more timing criteria to be fulfilled, before the wireless device 120-1 executes the ordered handover.
  • the ordered handover with the one or more criteria may be accomplished by sending a handover command, e.g. named Handover Command (HO) in LTE, to the wireless device 120-1 over RRC together with, e.g.
  • HO Handover Command
  • Such handover commands sent over a radio interface of the source radio network node 1 10 to the wireless deice 120-1 and other involved wireless device, e.g. the wireless devices 120-2..120..N that also have been subject to early handover preparations, may be spread out in time in order to balance signaling load over the radio interface of the source radio network node 1 10.
  • the source radio network node 110 may control pace and/or execution of the ordered handover execution(s) and the spread in time.
  • the order for handover execution may comprise a list of the target cells. This is discussed separately below.
  • a target radio network node e.g. the target radio network node 1 11
  • Action 403 may fully or partly correspond to Action 306 above.
  • Action 408 After action 403, an ordered handover execution may be cancelled by the first wireless communication network 100, e.g. by some network node comprised therein such as the source radio network node 110 or at least via this node. This may be done by explicitly by e.g. new RRC signaling from the first wireless communication network 100, e.g. from the source radio network node 110, to the wireless device 120-1.
  • Action 409 When handover execution is cancelled in the wireless device 120-1 , the handover is cancelled also with regard to the source cell 1 15 and the one or more target cells, e.g. the target cell 1 16. Handover cancel signaling as in already existing technology may be used for this purpose.
  • the wireless device 120-1 measures on the one or more target cells, including e.g. the target cell 1 16, and on the source cell 1 15, and then compares with e.g. received thresholds and measurement parameters to determine when the one of more parameters are fulfilled.
  • the first wireless communication network 100 may optionally have used random time-to-trigger parameters for different wireless devices being subject for early handover at the same time, in order to spread out further actions in time. Note that although the source radio network node 1 10 orders "conditional" handover with the one and more criteria according to embodiments herein, the wireless device 120-1 may still perform also other, e.g. conventional, measurements according to other, and/or existing, technologies, and report back accordingly.
  • Action 404 is not reflected in Figure 3 but would e.g. be performed between Action 306 and Action 307, where the wireless device 120-1 e.g. performs what is suitable in order to be able to determine when the one or more criteria are fulfilled and Action 307 may start.
  • Action 405 When e.g. the measurements in action 404 indicate that the one or more criteria received in action 403 are fulfilled, the wireless device 120-1 executes the handover ordered in action 403. An optional random delay may be applied by the wireless device 120-1 before the handover execution starts in order to spread out the signaling load on the radio interface over time. Action 405 may fully or partly correspond to Action 307 above.
  • Action 406 When the wireless device 120-1 has started the handover execution in action 405 by leaving the source cell 115, the first wireless communication network 100, e.g. the source radio network node 110, detects this. Examples of how this may be accomplished were provided above. This way the source cell 1 15, or source radio network node 11 1 , gets informed when it should stop scheduling and to start packet forwarding.
  • the first wireless communication network 100 e.g. the source radio network node 110
  • Action 406 may fully or partly correspond to Actions 308-309 above.
  • Action 407 The wireless device 120-1 continues the handover execution by tuning to the target cell 1 16 and performs a random access in the target cell 1 16 in a
  • the wireless device 120-1 may optionally apply a random delay before performing the random access procedure in the target cell 116.
  • the handover is considered successful, i.e. similar as conventionally and in existing technology. Thereafter procedures may continue as conventionally and in existing technology to complete the handover.
  • Action 407 may fully or partly correspond to Actions 310-31 1 above.
  • FIG. 5 is an schematic illustration for exemplifying some embodiments herein and shows an example scenario with two railroad lines passing through 5 cells named CELLs A-E.
  • the cells A-E may e.g. be comprised in the first wireless communication network 100. It can be expected that a number of wireless devices, e.g. the wireless devices 120- 1..120-N, in connected mode will pass through the cells in a number of more or less pre- determined paths, for example Cell D -> Cell B -> Cell E, or Cell A -> Cell B -> Cell C.
  • Cell B will act as an example as source cell and may thus correspond to the source cell 115.
  • Cell B decides, which may be predetermined and/or predefined, that when there is a number of incoming handovers in short period of time into Cell B for wireless devices, e.g. the wireless devices 120-1..120-N, coming from Cell A or from Cell D this shall trigger early handover preparations.
  • Another trigger that may be used is when a wireless device indicates bad coverage from a so called A2 measurement report.
  • the Cell C is selected as the target cell 116.
  • the Cell E is selected as the target cell 116.
  • This selection may be predetermined and/or predefined, and/or may be based on input, e.g. via or by a O&M node, by or controlled by an operator of the first wireless communication network 100, and/or be based on collected statistics in Cell B and/or the other involved cells, and/or by using historical information for the involved wireless devices 120-1..120-N.
  • statistics may be assembled and used in the first wireless communication network 100.
  • statistics may be collected for Cell B and probabilities of actual and successful handovers to different target cells may be calculated, or estimated, e.g. for wireless devices coming into Cell B from Cell A.
  • the target Cell C should be associated with the highest probability of an actual and successful handover when a wireless device comes into Cell B from Cell A; and target Cell E when a wireless device comes into Cell B from Cell D.
  • Target cells selected like this, or in a similar way may be target cells provided by the source radio network node 110, i.e. corresponding to when the source radio network node 110 and the target radio network node 1 1 are the same radio network node, which may be named intra radio network node handover, or intra-eNB handover. This in contrast to when the radio network nodes are different nodes, which may be named inter radio network node handover, or inter-eNB handover.
  • some embodiments may for one wireless device, e.g. the wireless device 120-1 , involve that multiple target cells have been selected for early handover preparation.
  • a list of such target cells may be sent with the handover execution order, e.g. comprised in the information commanding the wireless device 120-1 to start executing handover to the target cell 1 16 when certain one or more criteria are fulfilled, as discussed above under Action 306.
  • the target cells may be sorted in a prioritized list, e.g. based on calculated or estimated probabilities as discussed above in connection with Figure 5.
  • measurements by e.g. the wireless device 120-1 indicate that the one or more criteria are fulfilled for the highest prioritized target cell, then the wireless device 120-1 will execute the handover to that target cell, otherwise it will execute the handover execution to the highest prioritized target cell for which the one or more criteria are fulfilled.
  • the wireless device 120-1 may attempt to tune in to and access the next target cell with highest priority, e.g. the next target cell in the prioritized list, and so on.
  • the early handover preparations in e.g. Action 303 and Action 305 may e.g. be performed for two reasons: a) in order to avoid delay when/if an actual handover becomes necessary and b) in order to be able to spread out handover preparations in time in order to better utilize common resources needed to perform the handover preparations.
  • the early handover preparations reduce the time needed when an actual handover at some later point is to be carried out.
  • the preparation is then already done. It also enables an extended time period for performing actions during handover, which in turn enable that actions relating to handover can be spread in time, such as actions resulting from when a large amount of wireless devices request handover at the same or almost the same time. Without spreading such actions in time it may happen that a large amount of wireless devices are using, or at least attempt, to access and/or use the same limited resource(s) at the same time, which may result in handover failures.
  • embodiments herein improve handover.
  • Embodiments herein may be applied in general and be advantageous in many different situations as should be realized by the skilled person. Main advantages may be in scenarios with many users, i.e. wireless devices, moving comparatively quickly over a large coverage area, for example as in the case with commuter trains.
  • embodiments herein enable to distribute load relating to handover executions over time, thereby increasing a capacity of the wireless communication network to handle connected wireless devices. For example, signaling load caused by handover preparations may be reduced by being spread out over time thanks to embodiments herein. Embodiments herein may further spread out handover executions in time by applying optional random delays.
  • FIG. 6 is a flow chart schematically illustrating embodiments of a method, performed by the source radio network node 110, for preparing handover of a wireless device, e.g. the wireless device 120-1 , from a source cell, e.g. the source cell 1 15, to a target cell, e.g. the target cell 1 16.
  • At least the source cell 115 is provided by the source radio network node 110.
  • the source radio network node 110 and the source cell 1 15 are comprised in a first wireless communication network, e.g. the first wireless communication network 100.
  • the target cell 116 is also comprised in said first wireless communication network 100 or in another, second wireless communication network, e.g. the second wireless communication network 101.
  • the target cell 1 16 may have been elected based on one or more of the following: a probability for actual handover to the target cell 116,
  • the method comprises the following actions, which actions may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.
  • the source radio network 1 10 node identifies a triggering situation for early handover preparation.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device 120-1 from the source cell 1 15 to the target cell 116.
  • the triggering situation may be based on one or more of the following:
  • This action may fully or partly correspond to Action 302 above.
  • the source radio network 1 10 node performs actions of said early handover preparation, which actions start to be performed in response to the identification of the triggering situation.
  • all or part of said actions of early handover preparation and corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices are performed spread out in time in relation to each other.
  • Said actions of early handover preparation that is performed may comprise that the source radio network 1 10 sends information to the target radio network node 11 1 providing the target cell 116, which information identifies that early handover preparation is ongoing.
  • the source radio network 1 10 may send, to the wireless device 120-1 , in response to performed actions of the early handover preparation, information commanding the wireless device 120-1 to start executing handover to the target cell 1 16 when certain one or more criteria are fulfilled. Said criteria being specific for performing handover in response to said early handover preparation.
  • Said one or more criteria may be based on one or more of the following:
  • This action may fully or partly correspond to Action 306 above.
  • the source radio network 1 10 may perform packet forwarding to the target radio network node 11 1 , which packet forwarding is started in response to detection that the wireless device 120-1 has started executing handover to the target cell 1 16.
  • This action may fully or partly correspond to Action 309 above.
  • Figure 7 is a schematic block diagram for illustrating embodiments of the source radio network node 110, e.g. source radio base station or source eNB, mentioned above in connection with Figure 6, for preparing handover of the wireless device 120-1 from the source cell 1 15 to the target cell 116, in particular how the source radio network node 110, in addition to be configured to be comprised in the first wireless communication network 100 and to provide the source cell 115, may be configured to perform the method and actions discussed above in connection with Figure 6.
  • the source radio network node 110 e.g. source radio base station or source eNB, mentioned above in connection with Figure 6, for preparing handover of the wireless device 120-1 from the source cell 1 15 to the target cell 116, in particular how the source radio network node 110, in addition to be configured to be comprised in the first wireless communication network 100 and to provide the source cell 115, may be configured to perform the method and actions discussed above in connection with Figure 6.
  • the source radio network node 1 10 may comprise a processing module 701 , such 5 as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • a processing module 701 such 5 as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • the source radio network node 1 10 may further comprise a memory 702 that may comprise, such as contain or store, a computer program 703.
  • the computer program comprises 'instructions' or 'code' directly or indirectly executable by the source radio
  • the memory 702 may comprise one or more memory units and may be further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.
  • the source radio network node 110 may comprise a processing circuit
  • the processing module 701 may comprise, e.g. 'is embodied in the form of or 'realized by' the processing circuit 704. In these
  • the memory 702 may comprise the computer program 703 executable by the processing circuit 704, whereby the source radio network node 1 10 is operative, or
  • the source radio network node 110 e.g. the processing module 701 , comprises an Input/Output (I/O) module 705, configured to be involved in, e.g. by performing, any communication to and/or from other units and/or nodes, such as sending and/or receiving information to and/or from other external nodes or devices.
  • I/O Input/Output
  • module 705 may be exemplified by an obtaining, e.g. receiving, module and/or a
  • the source radio network node 1 e.g. the processing module 701
  • the processing module 701 may comprise one or more of an identifying module 706, a performing module 707 and a sending module 708 as exemplifying hardware and/or software
  • the identifying module 706, the performing module 707 and the sending module 708 may be fully or partly implemented by the processing circuit 704.
  • the source radio network node 110, and/or the processing module 701 and/or the identifying module 706 are operative, or configured, to identify the triggering situation for said early handover preparation.
  • the source radio network node 110, and/or the processing module 701 and/or the performing module 707 may be operative, or configured, to perform the actions of said early handover preparation, which actions start to be performed in response to the identification of the triggering situation.
  • the source radio network node 110, and/or the processing module 701 and/or the performing module 707 be operative, or configured to perform said actions of early handover preparation may comprise that the source radio network node 110 is configured to send said information to the target radio network node 11 1 providing the target cell 1 16, which information identifies that early handover preparation is ongoing.
  • the source radio network node 110, and/or the processing module 701 and/or the performing module 707 may be further operative, or configured to perform said all or part of said actions of early handover preparation and said corresponding actions of said simultaneously ongoing early handover preparations regarding said one or more other wireless devices, spread out in time in relation to each other.
  • the source radio network node 1 10, and/or the processing module 701 and/or the performing module 707 are further operative, or configured to perform said packet forwarding to the target radio network node 1 11.
  • the packet forwarding being started in response to detection that the wireless device 120-1 has started executing handover to the target cell 1 16.
  • the source radio network node 110, and/or the processing module 701 and/or the sending module 708 are operative, or configured, to send, to the wireless device 120-1 in response to that said actions of the early handover preparation have been performed, said information commanding the wireless device 120-1 to start executing handover to the target cell 1 16 when certain one or more criteria are fulfilled.
  • the criteria being specific for performing handover in response to said early handover preparation.
  • Figure 8 is a flow chart schematically illustrating embodiments of a method, performed by the target radio network node 11 1 , for preparing handover of a wireless device, e.g. the wireless device 120-1 , from a source cell, e.g. the source cell 1 15, to a target cell, e.g. the target cell 116. At least the target cell 1 16 is provided by the target radio network node 1 11.
  • the source cell 1 15 is comprised in a first wireless
  • the target radio network node 11 1 and the target cell 1 16 are also comprised in said first wireless communication network 100 or in another, second wireless communication network, e.g. the second wireless communication network 101.
  • the method comprises the following actions, which actions may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.
  • the target radio network node 1 11 obtains information that early handover preparation is ongoing.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device 120-1 from the source cell 1 15 to the target cell 116.
  • To obtain the information may comprise to receive the information from a source radio network node 1 10 providing the source cell 115.
  • This action may fully or partly correspond to Action 304 above.
  • the target radio network node 1 11 performs actions of early handover preparation, which actions start to be performed in response to that the information has been obtained.
  • all or part of said actions of early handover preparation and corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices are performed spread out in time in relation to each other.
  • To perform said actions of early handover preparation may comprised to send, to the source radio network node 1 10, information for commanding the wireless device 120- 1 to start executing handover to the target cell 1 16 when certain one or more criteria are fulfilled. Said criteria being specific for performing handover in response to said early handover preparation.
  • This action may fully or partly correspond to Action 305 above.
  • Figure 9 is a schematic block diagram for illustrating embodiments of the target radio network node 11 1 , e.g. target radio base station or target eNB, mentioned above in connection with Figure 8, for preparing handover of the wireless device 120-1 from the source cell 1 15 to the target cell 1 16, in particular how the target radio network node 11 1 , in addition to be configured to be comprised in the first wireless communication network 100 and/or second wireless communication network 101 , may be configured to perform the method and actions discussed above in connection with Figure 8.
  • the target radio network node 11 1 e.g. target radio base station or target eNB, mentioned above in connection with Figure 8
  • the target radio network node 11 1 in addition to be configured to be comprised in the first wireless communication network 100 and/or second wireless communication network 101 , may be configured to perform the method and actions discussed above in connection with Figure 8.
  • the target radio network node 1 11 may comprise a processing module 901 , such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • a processing module 901 such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • the target radio network node 1 11 may further comprise a memory 902 that may comprise, such as contain or store, a computer program 903.
  • the computer program comprises 'instructions' or 'code' directly or indirectly executable by the target radio network node 1 11 so that it performs the said methods and/or actions.
  • the memory 902 may comprise one or more memory units and may be further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.
  • the target radio network node 1 11 may comprise a processing circuit 904 as an exemplifying hardware module and may comprise or correspond to one or more processors.
  • the processing module 901 may comprise, e.g. 'is embodied in the form of or 'realized by' the processing circuit 904.
  • the memory 902 may comprise the computer program 903 executable by the processing circuit 904, whereby the target radio network node 1 11 is operative, or configured, to perform said method and/or actions.
  • the target radio network node 1 11 e.g. the processing module 901 , comprises an Input/Output (I/O) module 905, configured to be involved in, e.g. by performing, any communication to and/or from other units and/or nodes, such as sending and/or receiving information to and/or from other external nodes or devices.
  • the I/O module 905 may be exemplified by an obtaining, e.g. receiving, module and/or a providing, e.g. sending, module, when applicable.
  • the target radio network node 11 1 e.g. the processing module 901
  • the target radio network node 11 1 may comprise one or more of an obtaining module 906 and a performing module 907 as exemplifying hardware and/or software module(s).
  • the obtaining module 906 and the performing module 907 may be fully or partly implemented by the processing circuit 904.
  • the target radio network node 11 1 , and/or the processing module 901 and/or the obtaining module 906 are operative, or configured, to obtain said information that early handover preparation is ongoing.
  • the early handover preparation referring to handover preparation before any actual decision to perform handover of the wireless device 120-1 from the source cell 115 to the target cell 116.
  • the target radio network node 11 1 is further configured to perform all or part of said actions of early handover preparation so that said all or part of said actions of early handover preparation and corresponding actions of simultaneously ongoing early handover preparations regarding one or more other wireless devices, e.g. the wireless devices 120-2..120-N, are performed spread out in time in relation to each other.
  • the target radio network node 11 1 being configured to perform said actions of early handover preparation comprises that the target radio network node 11 1 is configured to send, to the source radio network node 110, information for commanding the wireless device 120-1 to start executing handover to the target cell 116.
  • the target radio network node 11 1 , and/or the processing module 901 and/or the performing module 907 may be operative, or configured, to perform said actions of early handover preparation, which actions start to be performed in response to that the information has been obtained.
  • Figure 10 is a flow chart schematically illustrating embodiments of a method, performed by a wireless device, e.g. the wireless device 120-1 , for managing handover of the wireless device 120-1 from a source cell, e.g. the source cell 115, to a target cell, e.g. the target cell 116, at least the source cell being provided by a source radio network node, e.g. the source radio network node 110.
  • the source radio network node 1 10 and the source cell 1 15 are comprised in a first wireless communication network, e.g. the first wireless communication network 100.
  • Said target cell 1 16 is also comprised in said first wireless communication network 100 or in another, second wireless communication network, e.g. the second wireless communication network 101.
  • the method comprises the following actions, which actions may be taken in any suitable order and/or be carried out fully or partly overlapping in time when this is possible and suitable.
  • the wireless device 120-1 receives, from the source radio network node 110, information commanding the wireless device 120-1 to start executing handover to the target cell 116 when certain one or more criteria are fulfilled.
  • the criteria being specific for performing handover in response to early handover preparation by the source radio network node 120-1.
  • the early handover preparation refers to handover preparation before any actual decision to perform handover of the wireless device 120-1 from the source cell 1 15 to the target cell 1 16.
  • the one or more criteria may be based on one or more thresholds regarding measurements by the wireless device 120-1 on the source cell 1 15 and/or target cell 116, and/or may be based on expiration of a timer.
  • This action may fully or partly correspond to Action 306 above.
  • the wireless device 120-1 may perform actions of handover execution in response to that said one or more criteria are fulfilled.
  • This action may fully or partly correspond to Action 307 above.
  • Figure 11 is a schematic block diagram for illustrating embodiments of the wireless device 120-1 mentioned above in connection with Figure 10, for managing handover of the wireless device 120-1 from the source cell 115 to the target cell 1 15, in particular how the wireless device 120-1 may be configured to perform the method and actions discussed above in connection with Figure 10.
  • the wireless device 120-1 may comprise a processing module 1101 , such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • a processing module 1101 such as a means, one or more hardware modules, including e.g. one or more processors, and/or one or more software modules for performing said methods and/or actions.
  • the target radio network node 1 11 may further comprise a memory 1102 that may comprise, such as contain or store, a computer program 1103.
  • the computer program comprises 'instructions' or 'code' directly or indirectly executable by the wireless device 120-1 so that it performs the said methods and/or actions.
  • the memory 1 102 may comprise one or more memory units and may be further be arranged to store data, such as configurations and/or applications involved in or for performing functions and actions of embodiments herein.
  • the wireless device 120-1 may comprise a processing circuit 1104 as an exemplifying hardware module and may comprise or correspond to one or more processors.
  • the processing module 1101 may comprise, e.g. 'is embodied in the form of or 'realized by' the processing circuit 1104. In these
  • the memory 1102 may comprise the computer program 1103 executable by the processing circuit 1104, whereby the wireless device 120-1 is operative, or configured, to perform said method and/or actions.
  • the wireless device 120-1 e.g. the processing module 1 101 , comprises an Input/Output (I/O) module 1105, configured to be involved in, e.g. by performing, any communication to and/or from other units and/or nodes, such as sending and/or receiving information to and/or from other external nodes or devices.
  • the I/O module 1105 may be exemplified by an obtaining, e.g. receiving, module and/or a providing, e.g. sending, module, when applicable.
  • the wireless device 120-1 e.g. the processing module 1 101 , may comprise one or more of an receiving module 1106 and a performing module 1107 as exemplifying hardware and/or software module(s).
  • the wireless device 120-1 e.g. the processing module 1 101
  • the wireless device 120-1 may comprise one or more of an receiving module 1106 and a performing module 1107 as exemplifying hardware and/or software module(s).
  • the receiving module 1106 and the performing module 1 107 may be fully or partly implemented by the processing circuit 1104.
  • the wireless device 120-1 , and/or the processing module 1101 and/or the receiving module 1106 are operative, or configured, to receive, from the source radio network node 120-1 , information commanding the wireless device 120-1 to start executing said handover to the target cell 1 16 when said certain one or more criteria are fulfilled.
  • the wireless device 120-1 , and/or the processing module 1101 and/or the performing module 1 107 may be operative, or configured, to perform said actions of handover execution in response to that said one or more criteria are fulfilled.
  • Figures 12a-c are schematic drawings illustrating embodiments relating to a computer program that may be any one of the computer programs 703, 903, 1103 and that comprises instructions that when executed by the processing circuits 704, 904, 1 104 respectively and/or the processing modules 701 , 901 , 1101 respectively, causes the source radio network node 110 and/or the target radio network node 1 11 and/or the wireless device 120-1 to perform as described above.
  • a data carrier e.g. a computer program product, comprising any one or both of the computer programs 703, 903, 1 103.
  • the data carrier may be one of an electronic signal, an optical signal, a radio signal, and a computer readable medium. Any one, some or all of the computer programs 703, 903, 1 103 may thus be stored on the computer readable medium.
  • data carrier may be excluded a transitory, propagating signal and the data carrier may correspondingly be named non-transitory data carrier.
  • Non-limiting examples of the data carrier being a computer-readable medium is a memory card or a memory stick 1201 as in Figure 12a, a disc storage medium 1202 such as a CD or DVD as in Figure 12b, a mass storage device 1203 as in Figure 12c.
  • the mass storage device 1203 is typically based on hard drive(s) or Solid State Drive(s) (SSD).
  • SSD Solid State Drive
  • the mass storage device 1203 may be such that is used for storing data accessible over a computer network 1204, e.g. the Internet or a Local Area Network (LAN).
  • a computer network 1204 e.g. the Internet or a Local Area Network (LAN).
  • LAN Local Area Network
  • any one, some or all of the computer programs 703, 903, 1103 may furthermore be provided as a pure computer program or comprised in a file or files.
  • the file or files may be stored on the computer-readable medium and e.g. available through download e.g. over the computer network 1204, such as from the mass storage device 1203 via a server.
  • the server may e.g. be a web or File Transfer Protocol (FTP) server.
  • FTP File Transfer Protocol
  • the file or files may e.g. be executable files for direct or indirect download to and execution on the source radio network node 110 and/or target radio network node 11 1 and/or the wireless device 120-1 , e.g. by any one or both of the processing circuits 704, 904, 1 104.
  • the file or files may also or alternatively be for intermediate download and compilation involving the same or another processor to make them executable before further download and execution causing the source radio network node 110 and/or the target radio network node 11 1 and/or the wireless device 120-1 to perform the method(s) as described above.
  • any hardware module(s) and/or circuit(s) mentioned in the foregoing may e.g. be included in a single ASIC or FPGA, or be distributed among several separate hardware components, whether individually packaged or assembled into a System-on-a-Chip (SoC).
  • SoC System-on-a-Chip
  • modules and circuitry discussed herein may refer to a combination of hardware modules, software modules, analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in memory, that, when executed by the one or more processors make the source radio network node 110 and/or the target radio network node 11 1 to be configured to and/or to perform the above-described methods, respectively.
  • Many details of examples above are in a particular RAT context, or contexts of different RATs, and/or may have a specific meaning in such contexts, as recognized by the skilled person. However, embodiments herein are not limited to only such contexts as used in the examples.
  • network node may as such refer to any type of radio network node (described below) or any network node, which may communicate with at least a radio network node.
  • network nodes include any radio network node stated above, a core network node (e.g. MSC, MME, etc.), Operations &
  • O&M Operations Support Systems
  • OSS Operations Support Systems
  • SON Self Organizing Network
  • positioning node e.g. E-SMLC
  • MDT MDT
  • radio network node may as such refer to any type of network node capable of serving a wireless device, e.g. UE, and/or that are connected to other network node(s) or network element(s) or any radio node from which a wireless device receives signals.
  • a radio network is typically comprised in a Radio Access Network (RAN) part of a wireless communication network.
  • RAN Radio Access Network
  • radio network nodes are Node B, base station (BS), multi-standard radio (MSR) radio node such as MSR BS, eNodeB, network controller, radio network controller (RNC), base station controller (BSC), relay, donor node controlling relay, base transceiver station (BTS), access point (AP), transmission points, transmission nodes, nodes in distributed antenna system (DAS) etc.
  • BS base station
  • MSR multi-standard radio
  • RNC radio network controller
  • BSC base station controller
  • relay donor node controlling relay
  • BTS base transceiver station
  • AP access point
  • transmission points transmission nodes
  • DAS distributed antenna system
  • node as used herein may be used for the sake of simplicity, in order to denote a node which may be a network node, a radio network node or a wireless device, as applicable.
  • the term "memory” may refer to a hard disk, a magnetic storage medium, a portable computer diskette or disc, flash memory, random access memory (RAM) or the like. Furthermore, the memory may be an internal register memory of a processor.
  • the expression “configured to” may mean that a processing circuit is configured to, or adapted to, by means of software or hardware configuration, perform one or more of the actions described herein.
  • number may be any kind of digit, such as binary, real, imaginary or rational number or the like. Moreover, “number”, “value” may be one or more characters, such as a letter or a string of letters. Also, “number”, “value” may be represented by a bit string.
  • the expression “transmit” and “send” are typically interchangeable. These expressions may include transmission by broadcasting, uni-casting, group-casting and the like. In this context, a transmission by broadcasting may be received and decoded by any authorized device within range. In case of uni-casting, one specifically addressed device may receive and encode the transmission. In case of group-casting, e.g. multicasting, a group of specifically addressed devices may receive and decode the

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des procédés, des nœuds de réseau (110; 111) et un dispositif sans fil (120-1) pour gérer des transferts d'un dispositif sans fil (120-1) d'une cellule source (115) vers une cellule cible (116), au moins une cellule source (115) étant mise à disposition par le nœud de réseau radio source (110). Le nœud de réseau radio source (110) et la cellule source (115) sont compris dans un premier réseau de communication sans fil (100). Ladite cellule cible (116) est également comprise dans ledit premier réseau de communication sans fil (100) ou dans un second réseau de communication sans fil (101) distinct du premier. Le nœud de réseau radio source (110) identifie (302 ; 601) une situation de déclenchement pour une préparation précoce de transfert. La préparation précoce de transfert se réfère à une préparation de transfert avant une décision réelle de réaliser un transfert du dispositif sans fil (120-1). Le nœud de réseau radio source (110) réalise (303 ; 602) des actions de ladite préparation précoce de transfert. Lesdites actions commencent à être réalisées en réponse à l'identification de la situation de déclenchement.
PCT/SE2015/050174 2015-02-13 2015-02-13 Préparation précode de transfert dans un réseau de communication sans fil WO2016130062A1 (fr)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108337700A (zh) * 2017-01-20 2018-07-27 北京佰才邦技术有限公司 一种终端自动切换的方法、基站及终端
WO2018172600A1 (fr) * 2017-03-23 2018-09-27 Nokia Technologies Oy Gestion de cellules candidates au transfert
WO2018192354A1 (fr) * 2017-04-21 2018-10-25 北京佰才邦技术有限公司 Procédé de transfert de données dans un processus de commutation, et station de base
CN108934049A (zh) * 2017-05-26 2018-12-04 捷开通讯(深圳)有限公司 通信切换方法及装置
WO2019158801A1 (fr) * 2018-02-14 2019-08-22 Nokia Technologies Oy Transfert intercellulaire conditionnel
CN110326327A (zh) * 2017-02-27 2019-10-11 英特尔Ip公司 用于条件性越区切换的退出条件和基于波束的移动性状态估计
CN110636561A (zh) * 2018-06-21 2019-12-31 中兴通讯股份有限公司 信息传输方法及装置、存储介质、电子装置
WO2020068424A1 (fr) * 2018-09-27 2020-04-02 Intel Corporation Gestion de transfert de données pour transfert intercellulaire conditionnel
CN110999390A (zh) * 2017-06-15 2020-04-10 Lg电子株式会社 在无线通信系统中执行切换过程的方法及其装置
CN111557110A (zh) * 2018-01-08 2020-08-18 联想(北京)有限公司 用于ue切换的方法和装置
WO2020197459A1 (fr) * 2019-03-28 2020-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Informations de probabilité d'exécution de transfert conditionnel à un nœud cible potentiel
WO2020218863A1 (fr) * 2019-04-26 2020-10-29 Lg Electronics Inc. Amélioration de la mobilité pour une technologie d'accès nouvelle radio
WO2020145558A3 (fr) * 2019-01-07 2020-12-17 주식회사 케이티 Procédé pour réaliser une communication à l'aide d'un réseau non terrestre, et appareil associé
WO2021028995A1 (fr) * 2019-08-09 2021-02-18 株式会社Ｎｔｔドコモ Terminal
WO2021056504A1 (fr) 2019-09-29 2021-04-01 Apple Inc. Réacheminement préalable de paquets de données pour un transfert conditionnel
EP3813414A4 (fr) * 2018-06-25 2021-08-25 Vivo Mobile Communication Co., Ltd. Procédé de configuration de ressource, terminal mobile, dispositif de côté réseau et support
WO2021194134A1 (fr) * 2020-03-25 2021-09-30 Lg Electronics Inc. Procédé et appareil de gestion de défaillance de mobilité conditionnelle dans un système de communication sans fil
EP3937534A1 (fr) * 2016-12-16 2022-01-12 Samsung Electronics Co., Ltd. Procédé et appareil de mesure de signal d'un terminal se déplaçant à grande vitesse dans un système de communication sans fil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130115954A1 (en) * 2011-11-03 2013-05-09 Renesas Mobile Corporation Method and apparatus for handover using predicted vehicular locations

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130115954A1 (en) * 2011-11-03 2013-05-09 Renesas Mobile Corporation Method and apparatus for handover using predicted vehicular locations

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Early HO CMD with Ping-Pong Avoidance, further information;", 3GPP TSG-RAN WG2 #84; R2-134432;, 11 November 2013 (2013-11-11), San Francisco, USA *
"HO Performance Improvement in Hetnet;", 3GPP TSG-RAN WG2 #81BIS; R2-130957;, Chicago, USA *

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* Cited by examiner, † Cited by third party
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EP3937534A1 (fr) * 2016-12-16 2022-01-12 Samsung Electronics Co., Ltd. Procédé et appareil de mesure de signal d'un terminal se déplaçant à grande vitesse dans un système de communication sans fil
CN108337700A (zh) * 2017-01-20 2018-07-27 北京佰才邦技术有限公司 一种终端自动切换的方法、基站及终端
CN110326327B (zh) * 2017-02-27 2022-06-28 苹果公司 用于条件性越区切换的退出条件和基于波束的移动性状态估计
US11510114B2 (en) 2017-02-27 2022-11-22 Apple Inc. Exit conditions for conditional handovers and beam based mobility state estimation
CN110326327A (zh) * 2017-02-27 2019-10-11 英特尔Ip公司 用于条件性越区切换的退出条件和基于波束的移动性状态估计
WO2018172600A1 (fr) * 2017-03-23 2018-09-27 Nokia Technologies Oy Gestion de cellules candidates au transfert
US11343722B2 (en) 2017-03-23 2022-05-24 Nokia Technologies Oy Management of handover candidate cells
CN108738095A (zh) * 2017-04-21 2018-11-02 北京佰才邦技术有限公司 一种切换过程中数据前转的方法及基站
WO2018192354A1 (fr) * 2017-04-21 2018-10-25 北京佰才邦技术有限公司 Procédé de transfert de données dans un processus de commutation, et station de base
CN108934049A (zh) * 2017-05-26 2018-12-04 捷开通讯(深圳)有限公司 通信切换方法及装置
CN110999390A (zh) * 2017-06-15 2020-04-10 Lg电子株式会社 在无线通信系统中执行切换过程的方法及其装置
US11350328B2 (en) 2017-06-15 2022-05-31 Lg Electronics Inc. Method for performing a handover procedure in a wireless communication system and a device therefor
CN111557110A (zh) * 2018-01-08 2020-08-18 联想(北京)有限公司 用于ue切换的方法和装置
WO2019158801A1 (fr) * 2018-02-14 2019-08-22 Nokia Technologies Oy Transfert intercellulaire conditionnel
US11412424B2 (en) 2018-02-14 2022-08-09 Nokia Technologies Oy Conditional handover
CN110636561A (zh) * 2018-06-21 2019-12-31 中兴通讯股份有限公司 信息传输方法及装置、存储介质、电子装置
EP3813425A4 (fr) * 2018-06-21 2022-01-26 ZTE Corporation Procédé et dispositif de transmission d'informations, support d'informations, et dispositif électronique
US11641606B2 (en) 2018-06-25 2023-05-02 Vivo Mobile Communication Co., Ltd. Resource configuration method, mobile terminal, network-side device, and medium
EP3813414A4 (fr) * 2018-06-25 2021-08-25 Vivo Mobile Communication Co., Ltd. Procédé de configuration de ressource, terminal mobile, dispositif de côté réseau et support
WO2020068424A1 (fr) * 2018-09-27 2020-04-02 Intel Corporation Gestion de transfert de données pour transfert intercellulaire conditionnel
WO2020145558A3 (fr) * 2019-01-07 2020-12-17 주식회사 케이티 Procédé pour réaliser une communication à l'aide d'un réseau non terrestre, et appareil associé
WO2020197459A1 (fr) * 2019-03-28 2020-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Informations de probabilité d'exécution de transfert conditionnel à un nœud cible potentiel
WO2020218863A1 (fr) * 2019-04-26 2020-10-29 Lg Electronics Inc. Amélioration de la mobilité pour une technologie d'accès nouvelle radio
WO2021028995A1 (fr) * 2019-08-09 2021-02-18 株式会社Ｎｔｔドコモ Terminal
CN114451009A (zh) * 2019-09-29 2022-05-06 苹果公司 预转发数据分组进行条件切换
WO2021056504A1 (fr) 2019-09-29 2021-04-01 Apple Inc. Réacheminement préalable de paquets de données pour un transfert conditionnel
EP4014550A4 (fr) * 2019-09-29 2023-05-10 Apple Inc. Réacheminement préalable de paquets de données pour un transfert conditionnel
US11706674B2 (en) 2019-09-29 2023-07-18 Apple Inc. Pre-forwarding data packets for conditional handover
CN114451009B (zh) * 2019-09-29 2024-05-03 苹果公司 预转发数据分组进行条件切换
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