US20160366631A1 - Position determination of a wireless device - Google Patents

Position determination of a wireless device Download PDF

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Publication number
US20160366631A1
US20160366631A1 US14/416,332 US201414416332A US2016366631A1 US 20160366631 A1 US20160366631 A1 US 20160366631A1 US 201414416332 A US201414416332 A US 201414416332A US 2016366631 A1 US2016366631 A1 US 2016366631A1
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Prior art keywords
wireless device
rat
positioning
detection procedure
target rat
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English (en)
Inventor
Giuseppe CRISCI
Ake Busin
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) reassignment TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: BUSIN, AKE, CRISCI, Giuseppe
Publication of US20160366631A1 publication Critical patent/US20160366631A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]

Definitions

  • Embodiments presented herein relate to position determination of a wireless device, and particularly to methods, a wireless device, a mobility management node, computer programs, and a computer program product for position determination of a wireless device.
  • communications networks there may be a challenge to obtain good performance and capacity for a given communications protocol, its parameters and the physical environment in which the communications network is deployed.
  • wireless devices incorporating radio access technologies defined by the telecommunications standards Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), etc.
  • GSM Global System for Mobile Communications
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • Such specific services may further involve the wireless device to use positioning technologies such as the Global Positioning System (GPS), or the Globalnaya navigatsionnaya sputnikovaya Mama
  • GPS Global Positioning System
  • GLONASS Globalnaya navigatsionnaya sputnikovaya
  • GLONASS Global Navigation Satellite System
  • NILR Network Induced Location Request
  • CS emergency circuit switched
  • RAN radio access network
  • GNSS global navigation satellite system
  • GPS and more recently also GLONASS
  • the wireless device may be regarded as taking a vital role in determining its location either by calculating it itself (wireless device-based) or by providing the RAN with the GNSS measurement results needed for the calculation (wireless device-assisted).
  • CS fallback procedure As described in 3GPP TS 23.272—“Circuit Switched (CS) fallback in Evolved Packet System (EPS)”.
  • Examples of some conditions are (but not limited to) the following: 1) the wireless device does not have Voice over LTE (VoLTE) capabilities, 2) the wireless device has VoLTE capabilities but is registered over a network which does not support VoLTE, and 3) the wireless device has VoLTE capabilities but is registered over a network which does not support an IMS emergency services (this information is in LTE broadcasted in the Broadcast Control Channel (BCCH) downlink (DL) Synchronization Channel (SCH) first system information block (SIB1)).
  • BCCH Broadcast Control Channel
  • DL downlink
  • SCH Synchronization Channel
  • SIB1 first system information block
  • the CS fallback procedure requires the wireless device to perform a RAT change; from LTE to WCDMA, or from LTE to GSM, for example according to network deployment and reported capabilities of the wireless device.
  • the LTE RAN triggers the RAT change by sending to the wireless device a Radio Resource Control (RRC) Connection Release message, which includes information elements for redirection of the wireless device to the new RAT.
  • RRC Radio Resource Control
  • the emergency call will be set up and the NILR positioning procedure will then take place.
  • a positioning procedure may be started already when the wireless device is operatively connected to an LTE network.
  • SRVCC Single Radio-Voice Call Continuity
  • the positioning procedure would be aborted.
  • a positioning procedure started when the wireless device is operatively connected to the LTE network will be aborted if an SRVCC procedure is triggered.
  • An object of embodiments herein is to provide efficient position determination of a wireless device.
  • a method for position determination of a wireless device is performed by the wireless device.
  • the method comprises detecting, whilst being operatively connected to a source radio access technology (RAT) an indicator requiring a handover of the wireless device to a target RAT.
  • the method comprises starting a positioning detection procedure of the wireless device before being handed over to the target RAT, the positioning detection procedure involving processing of positioning measurements.
  • the method comprises keeping the positioning measurements of the positioning detection procedure whilst the wireless device being handed over from the source RAT to the target RAT.
  • the method comprises continuing the positioning detection procedure using the positioning measurements whilst being operatively connected to the target RAT.
  • this provides efficient position determination of a wireless device.
  • this enables a fast position determination of the wireless device since the wireless device will trigger the positioning determination whilst being operatively connected to a source RAT and complete the positioning determination after having been redirected, or handed over, to the target RAT.
  • a wireless device for position determination of the wireless device.
  • the wireless device comprises a processing unit.
  • the processing unit is configured to detect, whilst being operatively connected to a source radio access technology (RAT) an indicator requiring a handover of the wireless device to a target RAT.
  • the processing unit is configured to start a positioning detection procedure of the wireless device before being handed over to the target RAT, the positioning detection procedure involving processing of positioning measurements.
  • the processing unit is configured to keep the positioning measurements of the positioning detection procedure whilst the wireless device is being handed over from the source RAT to the target RAT.
  • the processing unit is configured to continue the positioning detection procedure using the positioning measurements whilst being operatively connected to the target RAT.
  • a computer program for position determination of a wireless device comprising computer program code which, when run on a processing unit of a wireless device, causes the processing unit to perform a method according to the first aspect.
  • a method for position determination of a wireless device is performed by a mobility management node.
  • the method comprises detecting an indication of a wireless device being operatively connected to a source radio access technology (RAT), the indication requiring a handover of the wireless device to a target RAT.
  • the method comprises, in response thereto, sending a Location Services Application Protocol (LCS-AP) location request message to an evolved serving mobile location center (E-SMLC) of the wireless device.
  • LCS-AP location abort request message to the E-SMLC.
  • a mobility management node for position determination of a wireless device.
  • the mobility management node comprises a processing unit.
  • the processing unit is configured to detect an indication of a wireless device being operatively connected to a source radio access technology (RAT), the indication requiring a handover of the wireless device to a target RAT.
  • the processing unit is configured to, in response thereto, send a Location Services Application Protocol (LCS-AP) location request message to an evolved serving mobile location center (E-SMLC) of the wireless device.
  • LCS-AP location abort request message to the E-SMLC.
  • a computer program for position determination of a wireless device comprising computer program code which, when run on a processing unit of a mobility management node, causes the processing unit to perform a method according to the fourth aspect.
  • a seventh aspect there is presented a computer program product comprising a computer program according to at least one of the third aspect and the sixth aspect and a computer readable means on which the computer program is stored.
  • a system comprising at least one wireless device according to the second aspect and at least one mobility management node according to the fifth aspect.
  • any feature of the first, second, third, fourth, fifth, sixth, seventh and eight aspects may be applied to any other aspect, wherever appropriate.
  • any advantage of the first aspect may equally apply to the second, third, fourth, fifth, sixth, seventh, and/or eight aspect, respectively, and vice versa.
  • FIG. 1 is a schematic diagram illustrating a communication network according to embodiments
  • FIG. 2 a is a schematic diagram showing functional units of a wireless device according to an embodiment
  • FIG. 2 b is a schematic diagram showing functional modules of a wireless device according to an embodiment
  • FIG. 3 a is a schematic diagram showing functional units of mobility management node according to an embodiment
  • FIG. 3 b is a schematic diagram showing functional modules of a mobility management node according to an embodiment
  • FIG. 4 shows one example of a computer program product comprising computer readable means according to an embodiment
  • FIGS. 5, 6, 7, and 8 are flowcharts of methods according to embodiments.
  • FIGS. 9 and 10 are signalling diagrams of methods according to embodiments.
  • FIG. 1 is a schematic diagram illustrating a communications network 10 where embodiments presented herein can be applied.
  • the communications network 10 comprises network nodes 12 a, 12 b.
  • the network nodes 12 a, 12 b may be radio access network (RAN) nodes.
  • the network nodes may be radio base stations, base transceiver stations (BTSs), node Bs (NBs), and/or evolved node Bs (eNBs).
  • BTSs base transceiver stations
  • NBs node Bs
  • eNBs evolved node Bs
  • the network nodes 12 a, 12 b are operatively connected to entities of a core network 14 .
  • entities include, but are not limited to, a Mobility Management Node (MMN) 13 a, such as a Mobility Management Entity (MME), an Evolved Serving Mobile Location Center (E-SMLC) 13 b, a Base station subsystem/Radio network subsystem (BSS/RNS) 13 c, a Mobile Switching Center (MSC) 13 d, and a Gateway Mobile Location Center (GMLC) 13 e.
  • MME Mobility Management Entity
  • E-SMLC Evolved Serving Mobile Location Center
  • BSS/RNS Base station subsystem/Radio network subsystem
  • MSC Mobile Switching Center
  • GMLC Gateway Mobile Location Center
  • the functionalities of these entities are as such known in the art and further description thereof is therefore omitted.
  • the core network 14 may comprise further entities performing their ordinary functionality as known in the art.
  • the core network 14 is in turn operatively connected to a service and data providing Internet
  • a wireless device (WD) 11 may thus, by establishing a connection to one of the network nodes 12 a, 12 b access data and services of the IP network 15 .
  • wireless devices 11 include, but are not limited to, mobile stations, mobile phones, handsets, wireless local loop phones, user equipment (UE), smartphones, laptop computers, tablet computers, sensors, Internet-of-Things (IoT) devices, etc.
  • One of the network nodes 12 a acts as the serving, or source, network node (SNN) 12 a of the wireless device 11
  • the other of the network nodes 12 b acts as the target network node (TNN) 12 b of the wireless device 11
  • the source network node 12 a may be associated with a first, source, radio access technology (RAT)
  • the target network node 12 b may be associated with a second, target, RAT.
  • the target RAT is different from the source RAT. Examples of RATs will be provided below.
  • the wireless device 11 being operatively connected to a source/target network node has the same technical meaning as the wireless device 11 being operatively connected to a source/target RAT.
  • the terms source/target network node and source/target RAT may be used interchangeably.
  • the communications network 10 may comprise a plurality of network nodes 12 a, 12 b. Further, as the skilled person also understands, a plurality of wireless devices 11 may be operatively connected to each such network node 12 a, 12 b.
  • emergency calls are an example of services which may require position determination of the wireless device 11 .
  • the LTE network should provide GNSS assistance information to the wireless device 11 .
  • the LTE network is already aware about the emergency situation because the wireless device 11 may attempt the emergency call by sending a non-access stratum (NAS) Extended Service Request with “service type” information element set to “emergency call”.
  • NAS non-access stratum
  • the core network of the LTE network is therefore notified about the request cause.
  • the wireless device 11 may requests RRC Connection establishment to the LTE network with information element “establishment cause” set to “emergency”. Therefore the LTE network is notified about the request cause.
  • the wireless device 11 may start its positioning determination whilst still operatively connected to an LTE-based source RAT and continue the positioning determination when operatively connected to a non-LTE-based target RAT. Further, the network should take the necessary actions to expect the positioning procedure to continue and be finalized in the target RAT. Also in case the wireless device 11 has an ongoing IMS emergency call with positioning procedure the positioning procedure should continue in the target RAT even if an SRVCC occurs.
  • a wireless device 11 In order to obtain such position determination there is provided a wireless device 11 , a method performed by the wireless device 11 , a computer program comprising code, for example in the form of a computer program product, that when run on a processing unit of the wireless device 11 , causes the processing unit to perform the method.
  • a mobility management node 13 a In order to obtain such position determination there is further provided a mobility management node 13 a, a method performed by the mobility management node 13 a, and a computer program comprising code, for example in the form of a computer program product, that when run on a processing unit of the mobility management node 13 a, causes the processing unit to perform the method.
  • FIG. 2 a schematically illustrates, in terms of a number of functional units, the components of a wireless device 11 according to an embodiment.
  • a processing unit 21 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate arrays (FPGA) etc., capable of executing software instructions stored in a computer program product 41 a (as in FIG. 4 ), e.g. in the form of a storage medium 23 .
  • the storage medium 23 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the wireless device 11 may further comprise a communications interface 22 for communications with a source network node 12 a and a target network node 12 b.
  • the communications interface 22 may comprise one or more transmitters and receivers, comprising analogue and digital components and a suitable number of antennas for radio communications.
  • the processing unit 21 controls the general operation of the wireless device 11 e.g. by sending data and control signals to the communications interface 22 and the storage medium 23 , by receiving data and reports from the communications interface 22 , and by retrieving data and instructions from the storage medium 23 .
  • Other components, as well as the related functionality, of the wireless device 11 are omitted in order not to obscure the concepts presented herein.
  • FIG. 2 b schematically illustrates, in terms of a number of functional modules, the components of a wireless device 11 according to an embodiment.
  • the wireless device 11 of FIG. 2 b comprises a number of functional modules; a detect module 21 a configured to perform below step S 102 , a start procedure module 21 b configured to perform below step S 104 , a keep values module 21 c configured to perform below step S 106 , and a continue procedure module 21 d configured to perform below step S 108 .
  • each functional module 21 a - h may be implemented in hardware or in software.
  • one or more or all functional modules 21 a - h may be implemented by the processing unit 21 , possibly in cooperation with functional units 22 and/or 23 .
  • the processing unit 21 may thus be arranged to from the storage medium 23 fetch instructions as provided by a functional module 21 a - h and to execute these instructions, thereby performing any steps as will be disclosed hereinafter.
  • FIG. 3 a schematically illustrates, in terms of a number of functional units, the components of a mobility management node 13 a according to an embodiment.
  • a processing unit 31 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate arrays (FPGA) etc., capable of executing software instructions stored in a computer program product 41 b (as in FIG. 4 ), e.g. in the form of a storage medium 33 .
  • the processing unit 31 is thereby arranged to execute methods as herein disclosed.
  • the storage medium 33 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the mobility management node 13 a may further comprise a communications interface 32 for communications with functional entities and devices in the core network 14 as well as network nodes 12 a, 12 b of radio access networks.
  • the communications interface 32 may comprise one or more transmitters and receivers, comprising analogue and digital components and a suitable number of interfaces for wireline communications.
  • the processing unit 31 controls the general operation of the mobility management node 13 a e.g. by sending data and control signals to the communications interface 32 and the storage medium 33 , by receiving data and reports from the communications interface 32 , and by retrieving data and instructions from the storage medium 33 .
  • Other components, as well as the related functionality, of the mobility management node 13 a are omitted in order not to obscure the concepts presented herein.
  • FIG. 3 b schematically illustrates, in terms of a number of functional modules, the components of a mobility management node 13 a according to an embodiment.
  • the mobility management node 13 a of FIG. 3 b comprises a number of functional modules; a detect module 31 a configured to perform below step S 202 , and a send and/or receive module 31 b configured to perform below steps S 04 , S 208 , S 210 .
  • the mobility management node 13 a of FIG. 3 b may further comprise a number of optional functional modules, such as a monitor module 31 c configured to perform below step S 06 .
  • the functionality of each functional module 31 a - c will be further disclosed below in the context of which the functional modules 31 a - c may be used.
  • each functional module 31 a - c may be implemented in hardware or in software.
  • one or more or all functional modules 31 a - c may be implemented by the processing unit 31 , possibly in cooperation with functional units 32 and/or 33 .
  • the processing unit 31 may thus be arranged to from the storage medium 33 fetch instructions as provided by a functional module 31 a - c and to execute these instructions, thereby performing any steps as will be disclosed hereinafter.
  • the mobility management node 13 a may be provided as a standalone device or as a part of a further device.
  • the mobility management node 13 a may be, or be provided in, a Mobility Management Entity, MME.
  • a system may comprise at least one wireless device configured according to embodiments presented herein and at least one mobility management node configured according to embodiments presented herein.
  • FIG. 4 shows one example of a computer program product 41 a, 41 b comprising computer readable means 43 .
  • a computer program 42 a can be stored, which computer program 42 a can cause the processing unit 21 and thereto operatively coupled entities and devices, such as the communications interface 22 and the storage medium 23 , to execute methods according to embodiments described herein.
  • the computer program 42 a and/or computer program product 41 a may thus provide means for performing any steps of the wireless device 11 as herein disclosed.
  • a computer program 42 b can be stored, which computer program 42 b can cause the processing unit 31 and thereto operatively coupled entities and devices, such as the communications interface 32 and the storage medium 33 , to execute methods according to embodiments described herein.
  • the computer program 42 b and/or computer program product 41 b may thus provide means for performing any steps of the mobility management node 13 a as herein disclosed.
  • the computer program product 41 a, 41 b is illustrated as an optical disc, such as a CD (compact disc) or a DVD (digital versatile disc) or a Blu-Ray disc.
  • the computer program product 41 a, 41 b could also be embodied as a memory, such as a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM) and more particularly as a non-volatile storage medium of a device in an external memory such as a USB (Universal Serial Bus) memory or a Flash memory, such as a compact Flash memory.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • the computer program 42 a , 42 b is here schematically shown as a track on the depicted optical disk, the computer program 42 a
  • FIGS. 5 and 6 are flow charts illustrating embodiments of methods for position determination of a wireless device 11 as performed by the wireless device 11 .
  • FIGS. 7 and 8 are flow charts illustrating embodiments of methods for position determination of a wireless device 11 as performed by the mobility management node 13 a.
  • the methods are advantageously provided as computer programs 42 a, 42 b.
  • FIG. 5 illustrating a method for position determination of a wireless device 11 as performed by the wireless device 11 according to an embodiment.
  • the wireless device 11 is configured to, in a step S 102 , detect an indicator requiring a handover of the wireless device to a target RAT. Examples of such an indicator (and thus how it may be detected) will be provided below. The indicator is detected whilst the wireless device 11 is operatively connected to a source RAT. Examples of source RATs and target RATs will be provided below.
  • the indicator further requires a position of the wireless device 11 to be determined.
  • the wireless device 11 is configured to, in a step S 104 , start a positioning detection procedure of the wireless device 11 .
  • this procedure should start as early as possible. Particularly, this procedure is started before the wireless device 11 is handed over to the target RAT.
  • the positioning detection procedure involves processing of positioning measurements. Examples of such positioning measurements and how they may be processed will be provided below.
  • the wireless device 11 is configured to, in a step S 106 , keep the positioning measurements of the positioning detection procedure whilst the wireless device 11 is handed over from the source RAT to the target RAT.
  • the wireless device 11 may then continue the positioning detection procedure using the kept positioning measurements.
  • the wireless device 11 is configured to, in a step S 108 , continue the positioning detection procedure using the positioning measurements whilst being operatively connected to the target RAT.
  • the source RAT network When the wireless device 11 participates in, e.g., a CSFB procedure, for example due to an emergency call, the source RAT network already triggers a positioning procedure and sends positioning assistance information to the wireless device 11 before the wireless device 11 performs the RAT change (i.e., from being operatively connected to a source network node 12 a in the source RAT to being operatively connected to a target network node 12 b in the target RAT).
  • the wireless device 11 is thereby enabled to start performing its positioning determination procedure and continue this procedure whilst the RAT change procedure is still ongoing.
  • the positioning determination procedure will continue during the RAT change and be finalized when the wireless device 11 is operatively connected to the target RAT.
  • the indicator may be an emergency call indicator. Hence the wireless device 11 may detect the indicator during set-up of the emergency call.
  • the wireless device 11 may not be capable of performing Internet protocol multimedia subsystem (IMS) emergency calls in the source RAT.
  • IMS Internet protocol multimedia subsystem
  • the handover involves a circuit switched fallback (CSFB) of the wireless device 11 .
  • the handover involves a single radio voice call continuity (SRVCC) procedure.
  • CSFB circuit switched fallback
  • SSVCC single radio voice call continuity
  • the positioning detection procedure may involve the wireless device 11 to perform, or take part in, at least one sub-procedure.
  • the positioning detection procedure involves a sub-procedure of performing a network initiated location request (NILR) positioning procedure whilst being operatively connected to the source RAT.
  • NILR network initiated location request
  • the positioning measurements may be global navigation satellite system (GNSS) measurements.
  • the GNSS measurements may be assisted GNSS (A-GNSS) assistance data items.
  • the A-GNSS assistance data items may be received from an evolved serving mobile location center (E-SMLC).
  • E-SMLC evolved serving mobile location center
  • the wireless device 11 may be configured to acquire such measurements and/or data items.
  • the positioning procedure may continue sufficiently long for Assistance Data and GNSS measurements to be delivered to the wireless device 11 .
  • the source RAT may be a Long Term Evolution (LTE) compliant network.
  • LTE Long Term Evolution
  • the wireless device 11 may be operatively connected to a source network node 12 a being an eNB.
  • the target RAT may be a non-LTE compliant network, such as GSM or WCDMA.
  • the wireless device 11 may be operatively connected to a target network node 12 b not being an eNB (such as an NB or a BTS).
  • FIG. 6 illustrating methods for position determination of a wireless device 11 as performed by the wireless device 11 according to further embodiments.
  • the process may be complete by the wireless device 11 returning either the position (i.e., a wireless device-based approach) or the measurement results (i.e., a wireless device-assisted approach) once in the new RAT.
  • the wireless device 11 is configured to, in an optional step S 108 a, continue the to positioning detection procedure by completing the positioning detection procedure so as to determine a position of the wireless device 11 ; and, in an optional step S 108 b, provide the position to the target RAT.
  • the wireless device 11 is configured to, in an optional step S 108 c, provide the positioning measurements to the target RAT.
  • the wireless device 11 may respond to having detected the indicator in step S 102 .
  • the wireless device 11 may be configured to in response to detecting the indicator, in an optional step S 102 a, send a non-access stratum (NAS) extended service request with a service type information element set to emergency call to the source RAT.
  • NAS non-access stratum
  • the wireless device 11 may be configured to in response to detecting the indicator, in an optional step S 102 b, request a radio resource control (RRC) connection establishment with information element establishment cause set to emergency to the source RAT.
  • RRC radio resource control
  • the wireless device 11 may be handed over. For example, being handed over from the source RAT to the target RAT may require the wireless device 11 to be configured to, in an optional step S 106 a , receive information elements for redirection of the wireless device 11 to the target RAT.
  • the information elements for redirection may be received in a RRC connection release message.
  • FIG. 7 illustrating a method for position determination of a wireless device 11 as performed by the mobility management node 13 a according to an embodiment.
  • the mobility management node 13 a is configured to, in a step S 202 , detect an indication of a wireless device 11 .
  • the wireless device 11 is operatively connected to a source RAT.
  • the indication requires a handover of the wireless device 11 to a target RAT.
  • the mobility management node 13 a is configured to, in response thereto, in a step S 204 send a Location Services Application Protocol (LCS-AP) location request message to an evolved serving mobile location center (E-SMLC) 16 of the wireless device 11 .
  • LCS-AP Location Services Application Protocol
  • E-SMLC evolved serving mobile location center
  • the mobility management node 13 a is configured to, in a step S 208 , send, upon fulfilment of a criterion relating to the indication of the wireless device 11 , a LCS-AP location abort request message to the E-SMLC 13 b.
  • the indicator may be an emergency call indicator.
  • FIG. 8 illustrating methods for position determination of a wireless device 11 as performed by the mobility management node 13 a according to further embodiments.
  • the criterion relates to the number of packets sent to the wireless device 11 . Therefore, the mobility management node 13 a may be configured to, in an optional step S 206 , monitor transmission of assisted GNSS (A-GNSS) assistance data items from the E-SMLC 13 b to the wireless device 11 . The criterion may then be fulfilled when a configured number of data items have been sent from the E-SMLC 13 b to the wireless device 11 .
  • A-GNSS assisted GNSS
  • the criterion relates to the time elapsed.
  • the criterion may be fulfilled when a configured time interval starting at the detection of the indication has finished.
  • the mobility management node 13 a may be configured to, in an optional step S 210 , send an S1-AP context modification request.
  • the S1-AP context modification request may comprise a circuit switched fallback indicator.
  • the S1-AP context modification request may be sent to the source RAT upon the mobility management node 13 a having sent the LCS-AP location abort request.
  • the first particular embodiment relates to a CSFB scenario.
  • step S 301 The wireless device 11 makes an Extended Service Request for mobile originating CSFB indicating that the purpose is an emergency call.
  • One way to implement step S 301 is to perform any of step S 102 , step S 102 a and/or step S 102 b.
  • step S 302 The mobility management node 13 a detects the request for emergency call CSFB and also confirms from capabilities of the wireless device 11 that the wireless device 11 supports LPP. Instead of immediately starting the CSFB procedure the mobility management node 13 a first sends an LCS-AP Location Request message to the E-SMLC 13 b.
  • One way to implement step S 302 is to perform step S 202 .
  • step S 303 The E-SMLC 13 b delivers a preconfigured set of A-GNSS Assistance Data to the wireless device 11 and sends a LPP request Location Information requesting GNSS measurements.
  • One way to implement step S 303 is to perform any of step S 104 and step S 206 .
  • step S 304 After a configured number of LCS-AP messages has been delivered to the wireless device 11 and/or after timeout, the mobility management node 13 a sends an LCS-AP Location Abort Request to the E-SMLC 13 b.
  • One way to implement step S 304 is to perform step S 208 .
  • step S 305 The mobility management node 13 a sends an S1-AP Context Modification Request with a CSFB indicator to the source network node 12 a .
  • One way to implement step S 305 is to perform step S 210 .
  • step S 306 The source network node 12 a sends a Cell RRC Connection Release message to the wireless device 11 .
  • the wireless device 11 thus receives the Cell RRC Connection Release message.
  • One way to implement step S 306 is to perform any of step S 106 a and step S 210 .
  • step S 307 The wireless device 11 keeps received Assistance Data and, if feasible, continues its started processing of received GNSS measurements.
  • One way to implement step S 307 is to perform any of step S 106 .
  • step S 308 Fall back of the wireless device 11 is performed by the wireless device 11 being handed over to a target network node 12 b in GERAN or UTRAN.
  • One way to implement step S 308 is to perform step S 106 a.
  • the MSC 13 d sends a Location Request message to the BSS/RNS 13 c . This may be triggered by the request from the GMLC 13 e or triggered internally in the MSC 13 d due to an emergency call being set up by the wireless device 11 .
  • a Location Response is sent from the BSS/RNS 13 c to the MSC 13 d.
  • the MSC 13 d sends a Location Response to the GMLC 13 e.
  • a second particular embodiment for position determination of a wireless device 11 based on at least some of the above disclosed embodiments will now be disclosed in detail with reference to the signalling diagram of FIG. 10 .
  • the second particular embodiment relates to an SR-VCC scenario.
  • step S 401 A positioning session of a wireless device 11 is ongoing where the E-SMLC 13 b has started to exchange LPP messages with the wireless device 11 .
  • One way to implement step S 401 is to perform any of step S 102 and step S 102 a.
  • step S 402 The source network node 12 a detects that handover to GERAN or UTRAN is required for the wireless device 11 and initiates an SR-VCC procedure with the mobility management node 13 a.
  • One way to implement step S 402 is to perform any of step S 102 b and step S 202 .
  • step S 403 The mobility management node 13 a identifies that a handover of the wireless device 11 will occur.
  • the mobility management node 13 a waits until a configured time after the start of the positioning session in step S 401 has elapsed, or confirms that a configured number of LPP messages has been delivered to the wireless device 11 from the E-SMLC 13 b.
  • the mobility management node 13 a then sends an LCS-AP Location Abort Request to the E-SMLC 13 b.
  • One way to implement step S 403 is to perform any of step S 206 and step S 208 .
  • step S 405 The wireless device 11 keeps received Assistance Data and, if feasible, continues the started processing of received GNSS measurements.
  • One way to implement step S 405 is to perform any of step S 106 , S 106 a, and step S 108 .
  • step S 406 The wireless device 11 is handed over to a target network node 12 b in GERAN or UTRAN.
  • One way to implement step S 406 is to perform any of step S 106 a and step S 210 .
  • the GMLC 13 e may send a location Request message.
  • the MSC 13 d sends a Location Request message to the BSS/RNS 13 c.
  • a Location Response message is sent by the BSS/RNS 13 c to the MSC 13 d.
US14/416,332 2014-12-04 2014-12-04 Position determination of a wireless device Abandoned US20160366631A1 (en)

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BR112017011876B1 (pt) 2023-03-14
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