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WO2017186537A1 - Mobilité non autorisée de lte autonome - Google Patents

Mobilité non autorisée de lte autonome Download PDF

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Publication number
WO2017186537A1
WO2017186537A1 PCT/EP2017/059249 EP2017059249W WO2017186537A1 WO 2017186537 A1 WO2017186537 A1 WO 2017186537A1 EP 2017059249 W EP2017059249 W EP 2017059249W WO 2017186537 A1 WO2017186537 A1 WO 2017186537A1
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WIPO (PCT)
Prior art keywords
target cell
network node
wireless device
cell
radio access
Prior art date
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Ceased
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PCT/EP2017/059249
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English (en)
Inventor
Yusheng Liu
Emma Wittenmark
Mai-Anh Phan
Mattias BERGSTRÖM
Peter Alriksson
David Sugirtharaj
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of WO2017186537A1 publication Critical patent/WO2017186537A1/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
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Definitions

  • the present disclosure relates to methods and devices for enabling mobility when using Standalone LTE Unlicensed nodes in a network.
  • LTE Long-Term Evolution
  • RAT radio access technology
  • LTE radio spectrum
  • the radio spectrum (frequency/bandwidth) used by LTE is dedicated to LTE. This has the advantage that an LTE system does not need to deal with the issue of coexistence (where multiple nodes attempt to use the same radio resource), and the spectrum efficiency can be maximized.
  • the spectrum allocated to LTE is limited and cannot meet the ever increasing demand for larger throughput from applications/services.
  • the Third Generation Partnership Project (3GPP) is considering extending LTE to exploit unlicensed spectrum in addition to licensed spectrum.
  • Unlicensed spectrum can, by definition, be simultaneously used by multiple different technologies. Therefore, in this case, LTE needs to consider the coexistence issue with other systems such as IEEE 802.1 1 ("Wi-Fi").
  • Wi-Fi IEEE 802.1 1
  • Operating LTE in the same manner in unlicensed spectrum as in licensed spectrum can seriously degrade the performance of Wi-Fi as Wi-Fi will not transmit once it detects that a channel is occupied.
  • LAA Licensed Assisted Access
  • a user equipment, UE (the term used to refer to mobile devices, terminal devices, etc.) is connected to a primary cell (PCell) in the licensed band and one or more secondary cells (SCells) in the unlicensed band.
  • PCell primary cell
  • SCells secondary cells
  • a secondary cell in unlicensed spectrum is denoted as a license-assisted secondary cell (LA SCell).
  • Carriers in the PCell and SCell can be aggregated for uplink (UL) and/or downlink (DL) data transmissions for the UE.
  • Stand-alone LTE in unlicensed spectrum without assistance from a licensed carrier.
  • S-LTE-U Stand-alone LTE in unlicensed spectrum
  • one of the standalone designs is called MulteFire (MF) and is being standardized in by the MulteFire Alliance, where S-LTE-U eNB realization can be a MulteFire Access Point (MF AP).
  • MF MulteFire
  • the PCell will also operate on the unlicensed carrier and thus essential control signals and channels will also be subject to unmanaged interference and Listen-Before- Talk (LBT) procedures.
  • LBT Listen-Before- Talk
  • S-LTE-U differs in that the PCell is on unlicensed spectrum, the UE is required to initiate, establish and maintain the connection with the PCell, mobility (e.g. handovers) must work in an unsynchronized unplanned network, and mobility must work in an environment with dynamic neighbour relations.
  • S-LTE-U can be deployed with different core network (CN) architectures, as illustrated in Figures 1 and 2.
  • the S-LTE-U radio access network (RAN) 2 is directly connected to an Evolved Packet Core (EPC) 4, 6, 8 from one or multiple mobile network operators (MNOs).
  • EPC Evolved Packet Core
  • MNOs mobile network operators
  • Each MNO may have their own 3GPP RAN (i.e. a RAN standardised by 3GPP, such as LTE) 10, 12, or may share a 3GPP RAN with other MNOs.
  • An MNO provides mobility support to its subscribers between its 3GPP RAN 10 and the S-LTE-U RAN 2.
  • S-LTE-U RAN 2 is connected to a standalone core network (S-LTE-U CN) 14 for example a Neutral Host Core Network (NH CN), that is connected to MNOs and non-MNO service providers 16.
  • S-LTE-U CN 14 has roaming agreements with one or multiple MNOs.
  • S-LTE-U RAN 10 and S-LTE-CN 14 may have the same or different owners.
  • a UE may be served both by LTE networks and by the MF networks (not necessarily concurrently).
  • Mobility within the LTE domain is controlled by the eNB (the network node that provides the radio interface to the UEs) based on e.g. measurements reported to the eNB by the UE which the eNB then considers when sending handover commands to direct the UE from one LTE cell to another.
  • the eNB the network node that provides the radio interface to the UEs
  • a method of operation of a radio access network node comprises: transmitting a measurement configuration command to a wireless device; receiving a measurement report from the wireless device relating to a target cell; determining whether the target cell can be uniquely identified by information contained in the measurement report; and if the target cell cannot be uniquely identified by information contained in the measurement report, sending a DRX configuration command to the wireless device.
  • a radio access network node being configured to operate according to the preceding aspect.
  • a radio access network node for use in a communications network.
  • the radio access network node comprises a processor and a memory.
  • the memory contains instructions executable by the processor, such that the radio access network node is operable to: transmit a measurement configuration command to a wireless device; receive a measurement report from the wireless device relating to a target cell; determine whether the target cell can be uniquely identified by information contained in the measurement report; and, if the target cell cannot be uniquely identified by information contained in the measurement report, send a DRX configuration command to the wireless device.
  • a radio access network node for use in a communications network.
  • the radio access network node comprises: a transmitting module for transmitting a measurement configuration command to a wireless device; a receiving module for receiving a measurement report from the wireless device relating to a target cell; a determining module for determining whether the target cell can be uniquely identified by information contained in the measurement report; and a sending module for, if the target cell cannot be uniquely identified by information contained in the measurement report, sending a DRX configuration command to the wireless device.
  • a method of operation of a wireless device comprises: receiving a measurement configuration command from a radio access network node; and, if the wireless device is capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node: reading a cell identity from system broadcast information from at least one target cell; measuring a signal quality of the at least one target cell; and reporting the cell identity and the measured signal quality of the at least one target cell to the radio access network node.
  • a wireless device for use in a communications network, the device being configured to operate according to the preceding aspect.
  • a wireless device for use in a communications network comprises a processor and a memory.
  • the memory contains instructions executable by the processor, such that the wireless device is operable to: receive a measurement configuration command from a radio access network node; and, if the wireless device is capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node: read a cell identity from system broadcast information from at least one target cell; measure a signal quality of the at least one target cell; and report the cell identity and the measured signal quality of the at least one target cell to the radio access network node.
  • a wireless device for use in a communications network comprising: a receiving module for receiving a measurement configuration command from a radio access network node; a reading module for, if the wireless device is capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node, reading a cell identity from system broadcast information from at least one target cell; a measuring module for measuring a signal quality of the at least one target cell; and a reporting module for reporting the cell identity and the measured signal quality of the at least one target cell to the radio access network node.
  • a method of operation of a wireless device comprises: receiving a measurement configuration command from a radio access network node; and, if the wireless device is not capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node: reading a non-unique cell identity of at least one target cell; measuring a signal quality of the at least one target cell; and reporting the non-unique cell identity, a carrier frequency, and the measured signal quality of the at least one target cell to the radio access network node.
  • a wireless device for use in a communications network, the device being configured to operate according to the preceding aspect.
  • a wireless device for use in a communications network.
  • the device comprises a processor and a memory.
  • the memory contains instructions executable by the processor, such that the wireless device is operable to: receive a measurement configuration command from a radio access network node; and, if the wireless device is not capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node: read a non-unique cell identity of at least one target cell; measure a signal quality of the at least one target cell; and report the non-unique cell identity, a carrier frequency, and the measured signal quality of the at least one target cell to the radio access network node.
  • a wireless device for use in a communications network, comprising: a receiving module for receiving a measurement configuration command from a radio access network node; a reading module for, if the wireless device is not capable of reading system broadcast information from target cells without interrupting reception of signals from the radio access network node, reading a non-unique cell identity of at least one target cell; a measuring module for measuring a signal quality of the at least one target cell; and a reporting module for reporting the non-unique cell identity, a carrier frequency, and the measured signal quality of the at least one target cell to the radio access network node.
  • a computer program configured, when run on a computer, to carry out a method according to any one of the previous method aspects.
  • a computer program product comprising a computer readable medium and a computer program according to the preceding aspect.
  • Figure 1 illustrates an S-LTE-U RAN that is connected to an EPC from one or multiple MNOs;
  • Figure 2 illustrates an S-LTE-U RAN that is connected to an S-LTE-U CN;
  • FIG. 3 is a non-limiting example block diagram of a Long Term Evolution (LTE) cellular communications network
  • Figure 4 is a block diagram of a node according to an embodiment
  • Figure 5 is a block diagram of a wireless device according to an embodiment
  • Figure 6 is a flow chart illustrating a first method of operating a wireless device according to an embodiment
  • Figure 7 is a flow chart illustrating a second method of operating a wireless device according to an embodiment
  • Figure 8 is a flow chart illustrating a method of operating a radio access network node according to an embodiment.
  • Figure 9 illustrates a wireless network.
  • Hardware implementation may include or encompass, without limitation, digital signal processor (DSP) hardware, a reduced instruction set processor, hardware (e.g., digital or analog) circuitry including but not limited to application specific integrated circuit(s) (ASIC) and/or field programmable gate array(s) (FPGA(s)), and (where appropriate) state machines capable of performing such functions.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a computer is generally understood to comprise one or more processors, one or more processing units, one or more processing modules or one or more controllers, and the terms computer, processor, processing unit, processing module and controller may be employed interchangeably.
  • the functions may be provided by a single dedicated computer, processor, processing unit, processing module or controller, by a single shared computer, processor, processing unit, processing module or controller, or by a plurality of individual computers, processors, processing units, processing modules or controllers, some of which may be shared or distributed.
  • these terms also refer to other hardware capable of performing such functions and/or executing software, such as the example hardware recited above.
  • UE user equipment
  • UE user equipment
  • UE is a non-limiting term comprising any mobile or wireless device or node equipped with a radio interface allowing for at least one of: transmitting signals in uplink (UL) and receiving and/or measuring signals in downlink (DL).
  • a UE herein may comprise a UE (in its general sense) capable of operating or at least performing measurements in one or more frequencies, carrier frequencies, component carriers or frequency bands. It may be a "UE” operating in single- or multi-radio access technology (RAT) or multi-standard mode.
  • RAT multi-radio access technology
  • wireless device As well as “UE”, the terms “wireless device”, “mobile device” and “terminal device” may be used interchangeably in the following description, and it will be appreciated that such a device does not necessarily have to be 'mobile' in the sense that it is carried by a user.
  • the terms “mobile device” and “terminal device” encompass any device that is capable of communicating with communication networks that operate according to one or more mobile communication standards, such as the Global System for Mobile communications, GSM, Universal Mobile Telecommunications System (UMTS), Wideband Code-Division Multiple Access (WCDMA), Long-Term Evolution (LTE), New Radio (NR), etc., and communication networks where a mobile communication standard is used with unlicensed spectrum, such as MulteFire, where LTE is used or adapted for use on unlicensed spectrum.
  • mobile communication standard such as the Global System for Mobile communications, GSM, Universal Mobile Telecommunications System (UMTS), Wideband Code-Division Multiple Access (WCDMA), Long-Term Evolution (LTE), New Radio (NR), etc.
  • MulteFire where LTE is used or adapted for use on unlicensed spectrum.
  • a cell is associated with a base station, where a base station comprises in a general sense any network node transmitting radio signals in the downlink and/or receiving radio signals in the uplink.
  • Some example base stations, or terms used for describing base stations are gNB, eNodeB, eNB, NodeB, MulteFire Access Point (AP), Wireless Local Area Network (WLAN) AP, macro/micro/pico/femto radio base station, home eNodeB (also known as femto base station), relay, repeater, sensor, transmitting-only radio nodes or receiving-only radio nodes.
  • a base station may operate or at least perform measurements in one or more frequencies, carrier frequencies or frequency bands and may be capable of carrier aggregation.
  • radio access network node can refer to a base station, such as an eNodeB, a S-LTE-U AP such as a MulteFire AP or a WLAN AP, or a network node in the radio access network (RAN) responsible for resource management, such as a radio network controller (RNC). More generally, the term “node” as used herein can refer to a terminal device or a radio access network node.
  • the signalling described is either via direct links or logical links (e.g. via higher layer protocols and/or via one or more network nodes).
  • FIG. 3 shows an example diagram of an evolved UMTS Terrestrial Radio Access Network (E- UTRAN) architecture as part of an LTE-based communications system 32 to which the techniques described herein can be applied.
  • Nodes in a core network 34 part of the system 32 include one or more Mobility Management Entities (MMEs) 36, a key control node for the LTE access network, and one or more Serving Gateways (SGWs) 38 which route and forward user data packets while acting as a mobility anchor. They communicate with base stations or radio access nodes 40 referred to in LTE as eNBs, over an interface, for example an S1 interface.
  • the eNBs 40 can include the same or different categories of eNBs, e.g.
  • FIG. 3 also shows access points or APs 42 that are acting as base stations in respective standalone LTE unlicensed (S-LTE-U) cells.
  • the APs 42 may be MulteFire APs.
  • a UE 44 is shown, and the UE 44 can receive downlink data from and send uplink data to one of the base stations 40 or APs 42, with that base station 40 or AP 42 being referred to as the serving base station or AP of the UE 44.
  • Figure 4 shows a node 40; 42 that can be adapted or configured to operate according to one or more of the non-limiting example embodiments described.
  • the node can be a radio access network node 40 or 42, such as an eNB, a WLAN AP or a S-LTE-U AP such as a MulteFire AP.
  • the node 40; 42 comprises a processor or processing unit 50 that controls the operation of the node 40; 42.
  • the processing unit 50 is connected to a transceiver unit 52 (which comprises a receiver and a transmitter) with associated antenna(s) 54 which are used to transmit signals to and receive signals from other nodes in the network 32.
  • the processing unit 50 can comprise one or more modules for implementing individual processing steps of the techniques described herein.
  • the processing unit 50 and transceiver unit 52 are used to transmit signals to and receive signals from one or more wireless devices 44.
  • the node 40; 42 also comprises a memory or memory unit 56 that is connected to the processing unit 50 and that contains instructions or computer code executable by the processing unit 50 and other information or data required for the operation of the node 40; 42.
  • Figure 5 shows a wireless device, or UE, 44 that can be adapted or configured to operate according to one or more of the non-limiting example embodiments described.
  • the UE 44 comprises a processor or processing unit 60 that controls the operation of the UE 44.
  • the processing unit 60 is connected to a transceiver unit 62 (which comprises a receiver and a transmitter) with associated antenna(s) 64 which are used to transmit signals to and receive signals from other nodes in the network 32.
  • the processing unit 60 can comprise one or more modules for implementing individual processing steps of the techniques described herein.
  • the processing unit 60 and transceiver unit 62 are used to transmit signals to and receive signals from one or more radio access nodes 40; 42 (including different types of radio access nodes, such as eNBs, WLAN APs and S-LTE-U such as MulteFire APs).
  • the processing unit 60 and transceiver unit 62 can be adapted to communicate with multiple types of radio access technology (RAT), e.g. NR, LTE, WLAN and/or S-LTE-U including MulteFire.
  • RAT radio access technology
  • the UE 44 also comprises a memory or memory unit 66 that is connected to the processing unit 60 and that contains instructions or computer code executable by the processing unit 60 and other information or data required for the operation of the UE 44.
  • LTE and S-LTE-U with MulteFire as a specific example thereof
  • problems and solutions described herein are equally applicable to other types of wireless access networks and user equipments (UEs) implementing other access technologies and standards e.g. NR, and thus LTE and/or MulteFire (and the other LTE/MulteFire specific terminology used herein) should only be seen as examples of the technologies to which the techniques can be applied.
  • Network controlled mobility from LTE to S-LTE-U can utilize WLAN measurement configuration and report signalling for S-LTE-U measurement.
  • the S-LTE-U networks can be addressed by fields for identifiers of WLAN networks where said fields are interpreted in S-LTE-U specific manner. Seamless mobility can only be performed between two nodes with a neighbor relationship. In LTE and S-LTE-U this requires that the source eNB has the knowledge of the neighbor eNB's identifier that uniquely identifies the eNB globally, for example the E-UTRAN Cell Global Identifier (ECGI) thereof.
  • the ECGI is constructed from the Public Land Mobile Network (PLMN) identity the cell belongs to and the Cell Identity (CI) of the cell.
  • PLMN Public Land Mobile Network
  • CI Cell Identity
  • the UE Before performing mobility, the UE is requested to report the physical cell identity (PCI) and signal quality on a given carrier frequency. Based on the combination of PCI and carrier frequency, the source eNB derives the target ECGI if the neighbor relation is present, and communicates with the target to proceed with the mobility process.
  • PCI physical cell identity
  • the source eNB Based on the combination of PCI and carrier frequency, the source eNB derives the target ECGI if the neighbor relation is present, and communicates with the target to proceed with the mobility process.
  • the source eNB requests the UE to receive the ECGI that the UE discovered as mobility target candidate. This normally requires that the UE is configured to monitor the source eNB discontinuously (e.g. DRX configuration), and use the idle period to read broadcast information of the target candidate in order to get the target ECGI and report to the source eNB.
  • the source eNB can then initiate neighbor relation setup by communicating to the target eNB, and prepare for traffic steering.
  • S- LTE-U cells have the same profiles and attributes as LTE cells, and thus the S-LTE-U measurement cannot be directly incorporated into a WLAN measurement report.
  • the carrier frequency of S-LTE-U cell may be selected dynamically to adapt to the interference situation, the number of S-LTE-U cells may be large, leading to collisions in carrier frequency and cell identities.
  • the source eNB may not be able to derive the mobility target only by looking at the combination of the carrier frequency and the cell identity.
  • the source eNB could request the UE to report the ECGI of the target S-LTE-U cell with a standard procedure, but this introduces signalling overhead, and usually takes much longer time and has to take place after the S-LTE-U measurement reporting using the WLAN format. The risk for mobility failure increases accordingly in that situation.
  • Figure 6 is a flow chart, illustrating a method that can be performed in a radio access network node, such as an eNodeB or eNB.
  • a radio access network node such as an eNodeB or eNB.
  • FIGs 7 and 8 are flow charts, illustrating methods that can be performed in a wireless device, which in this example is a UE.
  • the source eNB configures the UE to discover nearby S-LTE- U networks, and hence to measure on S-LTE-U cells. This can be achieved via WLAN measurement configuration where for example the Basic Service Set Identification (BSSID) can be set to FF:FF:FF:FF:FF which is an out-of-range value to indicate the mobility target is S- LTE-U.
  • BSSID Basic Service Set Identification
  • the predefined range of values may relate to the format of the MAC addresses that can be used, and thus, for example, any out-of-range a value that cannot be used as a network identifier or as an identifier for a node can be used for this purpose.
  • the value FF:FF:FF:FF:FF is just one example of such a value.
  • This configuration may be sent either via broadcast or unicast messages to the UE.
  • the UE may be provided with separate radio transceiver circuitry, so that it is capable of decoding S-LTE-U signals using the separate radio without impacting the reception of signals from the source cell.
  • the UE performs the process shown in Figure 7. Specifically, the UE receives the configuration message requesting it to make S-LTE- U measurements at step 260. The UE can then search for S-LTE-U cells and receive system information broadcast messages in order to read an identifier that uniquely identifies the or each cell globally, for example the E-UTRAN Cell Global Identifier (ECGI) thereof. The UE can also obtain a measurement relating to a signal quality of signals received from the or each cell.
  • ECGI E-UTRAN Cell Global Identifier
  • the signal quality may be a Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ) or Signal-to-lnterference-plus-Noise Ratio (SINR).
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR Signal-to-lnterference-plus-Noise Ratio
  • the UE sends a report to the eNB, containing the ECGI and the signal quality measurement.
  • the UE may use the WLAN measurement report message to report discovered S-LTE-U cells.
  • An example for the UE to report the cell identity is to use the HESSID field in a WLAN measurement report message.
  • the Public Land Mobile Network (PLMN) identity field in ECGI can be coded from 24 bits to 20 bits by using binary numbering instead of directly storing digits.
  • PLMN Public Land Mobile Network
  • a PLMN identity 123.456 (which, with 4 bits for each digit, would require 24 bits in total) as stored as in the ECGI can be coded as 1 EDC8 (which requires 20 bits).
  • HESSID Homogenous Extended Service Set Identification
  • the UE can include the S-LTE-U cell signal quality measurement, e.g. the Reference Signal Received Power (RSRP), in the rssiWLAN field in the Wireless Local Area Network (WLAN) measurement report.
  • the rssiWLAN is used to carry the WLAN Received Signal Strength Indication (RSSI) that represents WLAN signal quality.
  • RSSI WLAN Received Signal Strength Indication
  • the S-LTE-U RSRP can be used by the LTE source eNB to decide whether it is suitable to steer the UE to the S-LTE-U cell.
  • the UE may be provided with only one radio transceiver, or alternatively the UE may have a separate radio that can be used for S-LTE-U cell signal quality measurement, but without the capability of receiving S-LTE-U system broadcast information.
  • the UE performs the process shown in Figure 8. Specifically, the UE receives the configuration message requesting it to make S-LTE-U measurements at step 280. The UE can then search for S-LTE-U cells and can discover the S-LTE-U carrier frequency (for example identified by a EUTRA Absolute radio-frequency channel number, EARFCN) and a physical cell identity (PCI) of one or more cell. The PCI does not uniquely identify the S-LTE-U cell.
  • the S-LTE-U carrier frequency for example identified by a EUTRA Absolute radio-frequency channel number, EARFCN
  • PCI physical cell identity
  • the UE reports discovered S-LTE-U cells.
  • the UE may use the WLAN measurement report message to report discovered S-LTE-U cells.
  • An example for the UE to report the cell identity is to use the HESSID field in a WLAN measurement report message.
  • the UE can then concatenate the carrier frequency and PCI using HESSID field, and report it via the WLAN measurement report message to inform the LTE source eNB that a S-LTE-U cell has been discovered.
  • the report sent at step 282 also includes a measurement relating to a signal quality of signals received from the or each detected cell.
  • the signal quality may be a Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ) or Signal-to- Interference-plus-Noise Ratio (SINR).
  • the UE can include the S-LTE-U cell signal quality measurement, e.g. the Reference Signal Received Power (RSRP), in the rssiWLAN field in the WLAN measurement report.
  • the rssiWLAN is used to carry the WLAN Received Signal Strength Indication (RSSI) that represents WLAN signal quality.
  • the S-LTE-U RSRP can be used by the LTE source eNB to decide whether it is suitable to steer the UE to the S-LTE-U cell.
  • the eNB receives a S-LTE-U measurement report from the UE.
  • this report may be the report sent at step 262 of Figure 7 or at step 282 of Figure 8.
  • the eNB determines whether the S-LTE-U measurement report, received from the UE, contains an ECGI, that is, whether the report is the report sent at step 262 of Figure 7.
  • the process passes to step 206, in which the LTE eNB can decide whether there is an existing neighbor relationship with that S-LTE-U eNB. If the neighbor relationship exists, the process passes to step 208, in which the LTE eNB proceeds with the mobility procedures.
  • the eNB can send a steering command or handover command to the UE, instructing it to perform mobility to the S-LTE-U eNB.
  • the process passes to step 210, in which the LTE eNB decides whether it is possible to setup a neighbor relation with the discovered mobility target candidate, and, if it is possible, the LTE eNB initiates the procedures to setup the neighbor relation. Thereafter, as before, the process passes to step 208, in which the LTE eNB proceeds with the mobility procedures.
  • the eNB can send a steering command or handover command to the UE, instructing it to perform mobility to the S-LTE-U eNB.
  • the UE receives the steering command, and performs the relevant mobility procedure, such as performing a handover to the target S-LTE-U cell.
  • the eNB can initiate a handover (provided that the signal quality criterion is met) more quickly and with a lower signalling overhead.
  • step 212 the LTE eNB determines whether there is a PCI collision, or whether the carrier frequency and PCI that were reported by the UE in step 282, can uniquely identify the S-LTE-U cell. If the eNB determines that there is an existing neighbor relationship with an S-LTE-U eNB having the reported PCI and carrier frequency, the process passes to step 208 as before. Thus, in this situation, although the eNB cannot know for certain that there is no other cell that has that combination of PCI and carrier frequency, the eNB may assume that it is the cell with the existing neighbor relation that the UE is reporting. In unusual cases in which this is not true, any handover will fail, and the eNB will learn over time that there might be a different cell with the same combination of PCI and carrier frequency.
  • the LTE eNB proceeds with the mobility procedures.
  • the eNB can send a steering command or handover command to the UE, instructing it to perform mobility to the S-LTE-U eNB.
  • the eNB determines at step 212 that there is a PCI collision, and the carrier frequency and PCI that were reported by the UE in step 282 cannot uniquely identify the S-LTE-U cell, the LTE eNB cannot derive deterministically whether the neighbor relationship exists. In that case, the process passes to step 214.
  • the LTE eNB configures the UE to measure and report the ECGI by configuring the UE with a Discontinuous Reception (DRX) cycle that is long enough that the UE has sufficient idle time to receive system broadcast information of the previously discovered S-LTE-U cell.
  • DRX Discontinuous Reception
  • the UE receives the DRX configuration and the ECGI report configuration, and detects the ECGI of the or each candidate target cell.
  • the UE reports the ECGI of the or each detected cell to the LTE source cell.
  • the LTE eNB receives the report sent by the UE at step 286, containing the ECGI of the or each candidate target cell.
  • step 218 the LTE eNB can decide whether there is an existing neighbor relationship with the or each S-LTE-U eNB, based on the ECGI that uniquely identifies the S-LTE-U eNB. If the neighbor relationship exists, the process passes to step 208, in which the LTE eNB proceeds with the mobility procedures. Thus, if the relevant mobility criteria are met, for example based on the received signal quality measurement, the eNB can send a steering command or handover command to the UE, instructing it to perform mobility to the S-LTE-U eNB.
  • the process passes to step 220, in which the LTE eNB decides whether it is possible to setup a neighbor relation with the discovered mobility target candidate, and, if it is possible, the LTE eNB initiates the procedures to setup the neighbor relation. Thereafter, as before, the process passes to step 208, in which the LTE eNB proceeds with the mobility procedures.
  • the eNB can send a steering command or handover command to the UE, instructing it to perform mobility to the S-LTE-U eNB.
  • the UE receives the steering command, and performs the relevant mobility procedure, such as performing a handover to the target S-LTE-U cell.
  • the techniques described herein provide methods for enabling mobility between LTE network nodes and S-LTE-U network nodes such as MulteFire network nodes.
  • FIG. 9 illustrates a wireless network comprising a more detailed view of network node 900 and wireless device (WD) 910, in accordance with a particular embodiment.
  • Figure 2 only depicts network 920, network nodes 900 and 900a, and WD 910.
  • Network node 900 comprises processor 202, storage 903, interface 901 , and antenna 901 a.
  • WD 910 comprises processor 912, storage 913, interface 91 1 and antenna 91 1 a.
  • These components may work together in order to provide network node and/or wireless device functionality, such as providing wireless connections in a wireless network.
  • the wireless network may comprise any number of wired or wireless networks, network nodes, base stations, controllers, wireless devices, relay stations, and/or any other components that may facilitate or participate in the communication of data and/or signals whether via wired or wireless connections.
  • Network 920 may comprise one or more IP networks, public switched telephone networks (PSTNs), packet data networks, optical networks, wide area networks (WANs), local area networks (LANs), wireless local area networks (WLANs), wired networks, wireless networks, metropolitan area networks, and other networks to enable communication between devices.
  • PSTNs public switched telephone networks
  • WANs wide area networks
  • LANs local area networks
  • WLANs wireless local area networks
  • wired networks wireless networks, metropolitan area networks, and other networks to enable communication between devices.
  • Network node 900 comprises processor 902, storage 903, interface 901 , and antenna 901 a. These components are depicted as single boxes located within a single larger box. In practice however, a network node may comprises multiple different physical components that make up a single illustrated component (e.g., interface 901 may comprise terminals for coupling wires for a wired connection and a radio transceiver for a wireless connection). As another example, network node 900 may be a virtual network node in which multiple different physically seperate components interact to provide the functionality of network node 900 (e.g., processor 902 may comprise three separate processors located in three separate enclosures, where each processor is responsible for a different function for a particular instance of network node 900).
  • processor 902 may comprise three separate processors located in three separate enclosures, where each processor is responsible for a different function for a particular instance of network node 900).
  • network node 900 may be composed of multiple physically separate components (e.g., a NodeB component and a RNC component, a BTS component and a BSC component, etc.), which may each have their own respective processor, storage, and interface components.
  • network node 900 comprises multiple separate components (e.g., BTS and BSC components)
  • one or more of the separate components may be shared among several network nodes.
  • a single RNC may control multiple NodeB's.
  • each unique NodeB and BSC pair may be a separate network node.
  • network node 900 may be configured to support multiple radio access technologies (RATs).
  • RATs radio access technologies
  • some components may be duplicated (e.g., separate storage 903 for the different RATs) and some components may be reused (e.g., the same antenna 901 a may be shared by the RATs).
  • Processor 902 may be a combination of one or more of a microprocessor, controller, microcontroller, central processing unit, digital signal processor, application specific integrated circuit, field programmable gate array, or any other suitable computing device, resource, or combination of hardware, software and/or encoded logic operable to provide, either alone or in conjunction with other network node 900 components, such as storage 903, network node 900 functionality.
  • processor 902 may execute instructions stored in storage 903.
  • Such functionality may include providing various wireless features discussed herein to a wireless devices, such as WD 910, including any of the features or benefits disclosed herein.
  • Storage 903 may comprise any form of volatile or non-volatile computer readable memory including, without limitation, persistent storage, solid state memory, remotely mounted memory, magnetic media, optical media, random access memory (RAM), read-only memory (ROM), removable media, or any other suitable local or remote memory component.
  • Storage 903 may store any suitable instructions, data or information, including software and encoded logic, utilized by network node 900. Storage 903 may be used to store any calculations made by processor 902 and/or any data received via interface 901.
  • Network node 900 also comprises interface 901 which may be used in the wired or wireless communication of signalling and/or data between network node 900, network 920, and/or WD 910.
  • interface 901 may perform any formatting, coding, or translating that may be needed to allow network node 900 to send and receive data from network 920 over a wired connection.
  • Interface 901 may also include a radio transmitter and/or receiver that may be coupled to or a part of antenna 901 a.
  • the radio may receive digital data that is to be sent out to other network nodes or WDs via a wireless connection.
  • the radio may convert the digital data into a radio signal having the appropriate channel and bandwidth parameters.
  • the radio signal may then be transmitted via antenna 901 a to the appropriate recipient (e.g., WD 910).
  • Antenna 901 a may be any type of antenna capable of transmitting and receiving data and/or signals wirelessly.
  • antenna 901 a may comprise one or more omnidirectional, sector or panel antennas operable to transmit/receive radio signals between, for example, 2 GHz and 66 GHz.
  • An omni-directional antenna may be used to transmit/receive radio signals in any direction
  • a sector antenna may be used to transmit/receive radio signals from devices within a particular area
  • a panel antenna may be a line of sight antenna used to transmit/receive radio signals in a relatively straight line.
  • WD 910 may be any type of wireless endpoint, mobile station, mobile phone, wireless local loop phone, smartphone, user equipment, desktop computer, PDA, cell phone, tablet, laptop, VoIP phone or handset, which is able to wirelessly send and receive data and/or signals to and from a network node, such as network node 900 and/or other WDs.
  • WD 910 comprises processor 912, storage 913, interface 91 1 , and antenna 91 1 a.
  • a wireless device may comprises multiple different physical components that make up a single illustrated component (e.g., storage 913 may comprise multiple discrete microchips, each microchip representing a portion of the total storage capacity).
  • Processor 912 may be a combination of one or more of a microprocessor, controller, microcontroller, central processing unit, digital signal processor, application specific integrated circuit, field programmable gate array, or any other suitable computing device, resource, or combination of hardware, software and/or encoded logic operable to provide, either alone or in combination with other WD 910 components, such as storage 913, WD 910 functionality. Such functionality may include providing various wireless features discussed herein, including any of the features or benefits disclosed herein.
  • Storage 913 may be any form of volatile or non-volatile memory including, without limitation, persistent storage, solid state memory, remotely mounted memory, magnetic media, optical media, random access memory (RAM), read-only memory (ROM), removable media, or any other suitable local or remote memory component.
  • Storage 913 may store any suitable data, instructions, or information, including software and encoded logic, utilized by WD 910. Storage 913 may be used to store any calculations made by processor 912 and/or any data received via interface 91 1 .
  • Interface 91 1 may be used in the wireless communication of signalling and/or data between WD 910 and network node 900.
  • interface 91 1 may perform any formatting, coding, or translating that may be needed to allow WD 910 to send and receive data from network node 900 over a wireless connection.
  • Interface 91 1 may also include a radio transmitter and/or receiver that may be coupled to or a part of antenna 91 1 a.
  • the radio may receive digital data that is to be sent out to network node 900 via a wireless connection.
  • the radio may convert the digital data into a radio signal having the appropriate channel and bandwidth parameters.
  • the radio signal may then be transmitted via antenna 91 1 a to network node 900.
  • Antenna 91 1 a may be any type of antenna capable of transmitting and receiving data and/or signals wirelessly.
  • antenna 91 1 a may comprise one or more omni- directional, sector or panel antennas operable to transmit/receive radio signals between 2 GHz and 66 GHz.
  • antenna 91 1 a may be considered a part of interface 91 1 to the extent that a wireless signal is being used.
  • any steps described herein are merely illustrative of certain embodiments. It is not required that all embodiments incorporate all the steps disclosed nor that the steps be performed in the exact order depicted or described herein. Furthermore, some embodiments may include steps not illustrated or described herein, including steps inherent to one or more of the steps disclosed herein. Any appropriate steps, methods, or functions may be performed through a computer program product that may, for example, be executed by the components and equipment illustrated in the figure above.
  • storage 903 may comprise computer readable means on which a computer program can be stored.
  • the computer program may include instructions which cause processor 202 (and any operatively coupled entities and devices, such as interface 901 and storage 903) to execute methods according to embodiments described herein.
  • the computer program and/or computer program product may thus provide means for performing any steps herein disclosed.
  • Each functional module may comprise software, computer programs, sub-routines, libraries, source code, or any other form of executable instructions that are executed by, for example, a processor.
  • each functional module may be implemented in hardware and/or in software.
  • one or more or all functional modules may be implemented by processors 912 and/or 202, possibly in cooperation with storage 913 and/or 903.
  • Processors 912 and/or 202 and storage 913 and/or 903 may thus be arranged to allow processors 912 and/or 202 to fetch instructions from storage 913 and/or 903 and execute the fetched instructions to allow the respective functional module to perform any steps or functions disclosed herein.

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

Abstract

L'invention concerne un dispositif sans fil qui reçoit une commande de configuration de mesure d'un nœud de réseau et, si le dispositif sans fil peut lire des informations de diffusion de système provenant de cellules cibles sans interrompre la réception de signaux du nœud de réseau, il lit une identité de cellule à partir des informations de diffusion de système provenant d'une cellule cible, mesure une qualité de signal de la cellule cible et déclare l'identité de cellule et la qualité de signal mesurée de la cellule cible au nœud de réseau. Sinon, si le dispositif sans fil ne peut pas lire les informations de diffusion de système provenant de cellules cibles sans interrompre la réception de signaux du nœud de réseau, alors il lit une identité non unique de cellule d'une cellule cible, mesure une qualité de signal de la cellule cible et déclare l'identité non unique de cellule, une fréquence de porteuse, et la qualité de signal mesurée de la cellule cible au nœud de réseau.
PCT/EP2017/059249 2016-04-26 2017-04-19 Mobilité non autorisée de lte autonome Ceased WO2017186537A1 (fr)

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US62/327,696 2016-04-26

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